# Settings Notifications

A notification settings screen with a live preview of the lock screen banner above alert and appearance options.

Settings Notifications is an open-source mobile screen from suiss/uim for React Native and Expo, with SwiftUI and Jetpack Compose versions built from the same design tokens. The @esuiss/uim CLI copies its source into your project, so you own the code.

Source: https://uim.suiss.app/docs/blocks/settings-notifications

![Preview](https://uim.suiss.app/previews/blocks-settings-notifications--default.light.webp)

```tsx title="uniwind/components/blocks/settings-notifications.tsx"
import { cn } from "cn"
import { ChatCircleIcon, CheckIcon } from "phosphor-react-native"
import * as React from "react"
import { Image, ScrollView, View } from "react-native"
import { FadeInUp, ReduceMotion } from "react-native-reanimated"
import { Picker, PickerItem } from "@/components/patterns/picker"
import { AnimatedView } from "@/components/ui/animated-view"
import { Icon } from "@/components/ui/icon"
import {
  Item,
  ItemActions,
  ItemContent,
  ItemGroup,
  ItemSeparator,
  ItemTitle,
} from "@/components/ui/item"
import { Screen } from "@/components/ui/screen"
import { Switch } from "@/components/ui/switch"
import { Text } from "@/components/ui/text"
import { Toggle } from "@/components/ui/toggle"
import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group"

const WALLPAPER =
  "https://images.unsplash.com/photo-1707324148764-99647364afa3?w=600&q=80&auto=format&fit=crop"

type Alert = "lock" | "center" | "banner"

const ALERTS: { value: Alert; label: string }[] = [
  { value: "lock", label: "Lock Screen" },
  { value: "center", label: "Notification Center" },
  { value: "banner", label: "Banners" },
]

const PREVIEW_OPTIONS = ["Always", "When Unlocked", "Never"]

const GROUPING_OPTIONS = ["Automatic", "By App", "Off"]

const MINI_SCREEN_BARS: Record<Alert, number[]> = {
  lock: [58, 74],
  center: [12, 29, 46, 63],
  banner: [8],
}

function bannerFootnote(allow: boolean, banner: boolean, style: string) {
  if (!allow) return "Notifications are off"
  if (!banner) return "No banners"
  return style === "persistent"
    ? "Banner stays until dismissed"
    : "Banner shows briefly"
}

function MiniScreen({ kind }: { kind: Alert }) {
  return (
    <View
      accessible={false}
      importantForAccessibility="no-hide-descendants"
      className="h-23 w-16 overflow-hidden rounded-xl border-2 border-label bg-indigo"
    >
      {kind === "lock" ? (
        <Text className="absolute inset-x-0 top-3 text-center text-sm font-semibold text-on-media">
          9:41
        </Text>
      ) : null}
      {MINI_SCREEN_BARS[kind].map((top, index) => (
        <View
          key={top}
          style={{ top: top - 2, opacity: 1 - index * 0.15 }}
          className="absolute inset-x-1.5 h-3.25 rounded-sm bg-on-media"
        />
      ))}
    </View>
  )
}

function Notification({ body, stacked }: { body: string; stacked?: boolean }) {
  return (
    <AnimatedView
      entering={FadeInUp.duration(600).reduceMotion(ReduceMotion.System)}
    >
      {stacked ? (
        <View className="absolute inset-x-2.5 -bottom-1.5 h-5 rounded-2xl bg-surface-raised opacity-55" />
      ) : null}
      <View className="flex-row gap-2.5 rounded-[1.125rem] bg-surface-raised px-3 py-2.5 opacity-95">
        <View className="size-7.5 shrink-0 items-center justify-center rounded-[7px] bg-green">
          <Icon
            as={ChatCircleIcon}
            weight="fill"
            className="size-4.5 text-on-accent"
          />
        </View>
        <View className="min-w-0 flex-1 gap-px">
          <View className="flex-row items-center gap-1.5">
            <Text className="flex-1 text-xs font-semibold">Riley Morgan</Text>
            <Text className="text-2xs text-label-secondary">now</Text>
          </View>
          <Text className="text-xs">{body}</Text>
        </View>
      </View>
    </AnimatedView>
  )
}

function SwitchRow({
  id,
  label,
  checked,
  onCheckedChange,
}: {
  id: string
  label: string
  checked: boolean
  onCheckedChange: (checked: boolean) => void
}) {
  return (
    <Item size="sm">
      <ItemContent>
        <ItemTitle nativeID={id} className="font-normal">
          {label}
        </ItemTitle>
      </ItemContent>
      <ItemActions>
        <Switch
          checked={checked}
          onCheckedChange={onCheckedChange}
          accessibilityLabelledBy={id}
        />
      </ItemActions>
    </Item>
  )
}

function SettingsNotifications() {
  const [allow, setAllow] = React.useState(true)
  const [enabled, setEnabled] = React.useState<Record<Alert, boolean>>({
    lock: true,
    center: true,
    banner: true,
  })
  const [bannerStyle, setBannerStyle] = React.useState("temporary")
  const [sounds, setSounds] = React.useState(true)
  const [badges, setBadges] = React.useState(true)
  const [previews, setPreviews] = React.useState("Always")
  const [grouping, setGrouping] = React.useState("Automatic")
  const [bannerKey, setBannerKey] = React.useState(0)
  const [bannerVisible, setBannerVisible] = React.useState(true)

  React.useEffect(() => {
    if (bannerStyle !== "temporary" || !bannerVisible) return
    const timer = setTimeout(() => setBannerVisible(false), 2600)
    return () => clearTimeout(timer)
  }, [bannerStyle, bannerVisible])

  const replay = () => {
    setBannerKey((key) => key + 1)
    setBannerVisible(true)
  }

  const body =
    previews === "Never"
      ? "Notification"
      : "Is the weekend trip to the coast still on?"
  const footnote = bannerFootnote(allow, enabled.banner, bannerStyle)

  const selects = [
    {
      label: "Show Previews",
      value: previews,
      options: PREVIEW_OPTIONS,
      onChange: (value: string) => {
        setPreviews(value)
        replay()
      },
    },
    {
      label: "Notification Grouping",
      value: grouping,
      options: GROUPING_OPTIONS,
      onChange: setGrouping,
    },
  ]

  return (
    <Screen edges={["top", "right", "left"]}>
      <ScrollView contentContainerClassName="gap-5 px-4 pt-4 pb-8">
        <View className="flex-row items-center gap-3">
          <View className="size-10 items-center justify-center rounded-[0.625rem] bg-green">
            <Icon
              as={ChatCircleIcon}
              weight="fill"
              className="size-6 text-on-accent"
            />
          </View>
          <View>
            <Text role="heading" className="text-2xl font-bold">
              Messages
            </Text>
            <Text className="text-sm text-label-secondary">Notifications</Text>
          </View>
        </View>
        <View
          accessible
          accessibilityRole="image"
          accessibilityLabel={`Lock screen preview. ${footnote}.`}
          className="h-75 overflow-hidden rounded-3xl bg-media"
        >
          <Image
            source={{ uri: WALLPAPER }}
            resizeMode="cover"
            accessibilityIgnoresInvertColors
            className="absolute inset-0 size-full"
          />
          <View className="absolute inset-0 bg-scrim opacity-40" />
          <View className="absolute inset-x-0 top-10 items-center">
            <Text className="text-xs font-semibold text-on-media opacity-90">
              Tuesday, October 6
            </Text>
            <Text className="text-3xl font-semibold text-on-media">9:41</Text>
          </View>
          {allow && enabled.banner && bannerVisible ? (
            <View key={bannerKey} className="absolute inset-x-2 top-2">
              <Notification body={body} />
            </View>
          ) : null}
          {allow && enabled.lock ? (
            <View className="absolute inset-x-2 top-40">
              <Notification body={body} stacked={grouping !== "Off"} />
            </View>
          ) : null}
          <Text className="absolute inset-x-0 bottom-3.5 text-center text-2xs text-on-media opacity-85">
            {footnote}
          </Text>
        </View>
        <ItemGroup variant="inset">
          <SwitchRow
            id="settings-notifications-allow"
            label="Allow Notifications"
            checked={allow}
            onCheckedChange={(value) => {
              setAllow(value)
              replay()
            }}
          />
        </ItemGroup>
        <View
          style={{ pointerEvents: allow ? "auto" : "none" }}
          accessibilityState={{ disabled: !allow }}
          className={cn("gap-5", !allow && "opacity-35")}
        >
          <Text role="heading" className="-mb-3 px-1 text-sm font-semibold">
            Alerts
          </Text>
          <ItemGroup variant="inset">
            <View className="flex-row px-2">
              {ALERTS.map((alert) => {
                const on = enabled[alert.value]
                return (
                  <Toggle
                    key={alert.value}
                    pressed={on}
                    onPressedChange={(pressed) => {
                      setEnabled((current) => ({
                        ...current,
                        [alert.value]: pressed,
                      }))
                      replay()
                    }}
                    accessibilityLabel={alert.label}
                    className="h-auto flex-1 flex-col gap-2 rounded-xl bg-transparent pt-3.5 pb-3 active:bg-transparent"
                  >
                    <MiniScreen kind={alert.value} />
                    <Text className="text-center text-sm text-label">
                      {alert.label}
                    </Text>
                    <View
                      className={cn(
                        "size-5.5 items-center justify-center rounded-full border-[1.5px]",
                        on
                          ? "border-transparent bg-accent"
                          : "border-separator-strong"
                      )}
                    >
                      {on ? (
                        <Icon
                          as={CheckIcon}
                          weight="bold"
                          className="size-3 text-on-accent"
                        />
                      ) : null}
                    </View>
                  </Toggle>
                )
              })}
            </View>
            {enabled.banner ? (
              <>
                <ItemSeparator />
                <Item size="sm">
                  <ItemContent>
                    <ItemTitle className="font-normal">Banner Style</ItemTitle>
                  </ItemContent>
                  <ItemActions>
                    <ToggleGroup
                      spacing={0}
                      size="sm"
                      value={[bannerStyle]}
                      onValueChange={(value) => {
                        if (!value[0]) return
                        setBannerStyle(value[0])
                        replay()
                      }}
                      accessibilityLabel="Banner style"
                    >
                      <ToggleGroupItem value="temporary">
                        <Text>Temporary</Text>
                      </ToggleGroupItem>
                      <ToggleGroupItem value="persistent">
                        <Text>Persistent</Text>
                      </ToggleGroupItem>
                    </ToggleGroup>
                  </ItemActions>
                </Item>
              </>
            ) : null}
            <ItemSeparator />
            <SwitchRow
              id="settings-notifications-sounds"
              label="Sounds"
              checked={sounds}
              onCheckedChange={setSounds}
            />
            <ItemSeparator />
            <SwitchRow
              id="settings-notifications-badges"
              label="Badges"
              checked={badges}
              onCheckedChange={setBadges}
            />
          </ItemGroup>
          <Text role="heading" className="-mb-3 px-1 text-sm font-semibold">
            Appearance
          </Text>
          <ItemGroup variant="inset">
            {selects.map((row, index) => (
              <React.Fragment key={row.label}>
                {index > 0 ? <ItemSeparator /> : null}
                <Item size="sm" className="py-1.5">
                  <ItemContent>
                    <ItemTitle className="font-normal">{row.label}</ItemTitle>
                  </ItemContent>
                  <ItemActions>
                    <Picker
                      size="sm"
                      value={row.value}
                      onValueChange={row.onChange}
                      accessibilityLabel={row.label}
                      className="bg-transparent px-1"
                    >
                      {row.options.map((option) => (
                        <PickerItem key={option} value={option}>
                          {option}
                        </PickerItem>
                      ))}
                    </Picker>
                  </ItemActions>
                </Item>
              </React.Fragment>
            ))}
          </ItemGroup>
        </View>
      </ScrollView>
    </Screen>
  )
}

export { SettingsNotifications }
```

```swift title="swift/Blocks/SettingsNotifications.swift"
import PhosphorSwift
import SwiftUI

public struct SettingsNotifications: View {
  enum Alert: String, CaseIterable, Sendable {
    case lock, center, banner

    var label: LocalizedStringKey {
      switch self {
      case .lock: "Lock Screen"
      case .center: "Notification Center"
      case .banner: "Banners"
      }
    }

    var bars: [CGFloat] {
      switch self {
      case .lock: [58, 74]
      case .center: [12, 29, 46, 63]
      case .banner: [8]
      }
    }
  }

  static let wallpaper = URL(string: "https://images.unsplash.com/photo-1707324148764-99647364afa3?w=600&q=80&auto=format&fit=crop")
  static var previewOptions: [String] { ["Always", "When Unlocked", "Never"] }
  static var groupingOptions: [String] { ["Automatic", "By App", "Off"] }

  @State private var allow: Bool
  @State private var enabled: Set<Alert> = Set(Alert.allCases)
  @State private var bannerStyle: String? = "temporary"
  @State private var sounds = true
  @State private var badges = true
  @State private var previews: String? = "Always"
  @State private var grouping: String? = "Automatic"
  @State private var bannerKey = 0
  @State private var bannerVisible = true
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  public init() {
    self.init(allow: true)
  }

  init(allow: Bool) {
    _allow = State(initialValue: allow)
  }

  private var footnote: LocalizedStringKey {
    if !allow { return "Notifications are off" }
    if !enabled.contains(.banner) { return "No banners" }
    return bannerStyle == "persistent" ? "Banner stays until dismissed" : "Banner shows briefly"
  }

  private var message: LocalizedStringKey {
    previews == "Never" ? "Notification" : "Is the weekend trip to the coast still on?"
  }

  public var body: some View {
    Screen {
      KeyboardScrollView {
        VStack(alignment: .leading, spacing: 20) {
          heading
          ItemGroup(.inset) {
            switchRow("Allow Notifications", isOn: Binding(
              get: { allow },
              set: { value in
                allow = value
                replay()
              }
            ))
          }
          VStack(alignment: .leading, spacing: 20) {
            sectionTitle("Alerts")
            ItemGroup(.inset) {
              HStack(spacing: 0) {
                ForEach(Alert.allCases, id: \.self) { alert in
                  SettingsNotificationsAlert(alert: alert, on: enabled.contains(alert)) {
                    if enabled.contains(alert) {
                      enabled.remove(alert)
                    } else {
                      enabled.insert(alert)
                    }
                    replay()
                  }
                }
              }
              .padding(.horizontal, 8)
              if enabled.contains(.banner) {
                ItemSeparator()
                Item(size: .sm) {
                  ItemContent {
                    ItemTitle { Text("Banner Style").fontWeight(.regular) }
                  }
                  ItemActions {
                    ToggleGroup(selection: Binding(
                      get: { bannerStyle },
                      set: { value in
                        guard let value else { return }
                        bannerStyle = value
                        replay()
                      }
                    ), size: .sm, spacing: 0) {
                      ToggleGroupItem("Temporary", value: "temporary")
                      ToggleGroupItem("Persistent", value: "persistent")
                    }
                    .accessibilityLabel(Text("Banner style"))
                  }
                }
              }
              ItemSeparator()
              switchRow("Sounds", isOn: $sounds)
              ItemSeparator()
              switchRow("Badges", isOn: $badges)
            }
            sectionTitle("Appearance")
            ItemGroup(.inset) {
              pickerRow("Show Previews", selection: Binding(
                get: { previews },
                set: { value in
                  previews = value
                  replay()
                }
              ), options: Self.previewOptions)
              ItemSeparator()
              pickerRow("Notification Grouping", selection: $grouping, options: Self.groupingOptions)
            }
          }
          .disabled(!allow)
          .opacity(allow ? 1 : 0.35)
          .animation(.easeInOut(duration: 0.3), value: allow)
          lockScreen
            .frame(maxWidth: .infinity)
            .padding(.vertical, 20)
            .background(Color.surfaceSecondary, in: RoundedRectangle(cornerRadius: Radius.xl3, style: .continuous))
        }
        .padding(.horizontal, 20)
        .padding(.vertical, 24)
      }
    }
    .task(id: [bannerStyle == "temporary", bannerVisible, bannerKey != 0]) {
      guard bannerStyle == "temporary", bannerVisible else { return }
      try? await Task.sleep(for: .milliseconds(2600))
      guard !Task.isCancelled else { return }
      withAnimation(reduceMotion ? nil : .easeOut(duration: 0.4)) { bannerVisible = false }
    }
  }

  private var heading: some View {
    HStack(spacing: 12) {
      Ph.chatCircle.fill
        .frame(width: 24, height: 24)
        .foregroundStyle(Color.onAccent)
        .frame(width: 40, height: 40)
        .background(Color.green, in: RoundedRectangle(cornerRadius: Radius.lg, style: .continuous))
        .accessibilityHidden(true)
      VStack(alignment: .leading, spacing: 0) {
        Text("Messages")
          .scaledFont(.xl2, weight: .bold)
          .accessibilityAddTraits(.isHeader)
        Text("Notifications")
          .scaledFont(.sm)
          .foregroundStyle(Color.labelSecondary)
      }
    }
  }

  private func sectionTitle(_ title: LocalizedStringKey) -> some View {
    Text(title)
      .scaledFont(.sm, weight: .semibold)
      .padding(.horizontal, 4)
      .padding(.bottom, -12)
      .accessibilityAddTraits(.isHeader)
  }

  private func switchRow(_ title: LocalizedStringKey, isOn: Binding<Bool>) -> some View {
    Item(size: .sm) {
      ItemContent {
        ItemTitle { Text(title).fontWeight(.regular) }
      }
      ItemActions {
        Toggle(isOn: isOn) { Text(title) }
          .labelsHidden()
          .accessibilityLabel(Text(title))
          .toggleStyle(SwitchStyle())
      }
    }
  }

  private func pickerRow(_ title: LocalizedStringKey, selection: Binding<String?>, options: [String]) -> some View {
    Item(size: .sm) {
      ItemContent {
        ItemTitle { Text(title).fontWeight(.regular) }
      }
      ItemActions {
        OptionPicker(selection: selection, size: .sm) {
          ForEach(options, id: \.self) { option in
            OptionPickerItem(LocalizedStringKey(option), value: option)
          }
        }
        .fixedSize()
        .accessibilityLabel(Text(title))
      }
    }
  }

  private var lockScreen: some View {
    Color.media
      .overlay {
        AsyncImage(url: Self.wallpaper) { phase in
          if let image = phase.image {
            image.resizable().scaledToFill()
          }
        }
      }
      .overlay {
        LinearGradient(colors: [Color.media.opacity(0.15), Color.media.opacity(0.35)], startPoint: .top, endPoint: .bottom)
      }
      .overlay(alignment: .top) {
        ZStack(alignment: .top) {
          Capsule()
            .fill(Color.media)
            .frame(width: 74, height: 22)
            .padding(.top, 8)
          VStack(spacing: 0) {
            Text("Tuesday, October 6")
              .scaledFont(.xs2, weight: .semibold)
              .opacity(0.9)
            Text(verbatim: "9:41")
              .font(.system(size: 60, weight: .semibold))
              .tracking(-2)
          }
          .padding(.top, 50)
          if allow && enabled.contains(.lock) {
            SettingsNotificationsCard(message: message, stacked: grouping != "Off")
              .padding(.horizontal, 8)
              .padding(.top, 300)
          }
          if allow && enabled.contains(.banner) && bannerVisible {
            SettingsNotificationsCard(message: message, stacked: false)
              .id(bannerKey)
              .padding(.horizontal, 8)
              .padding(.top, 38)
              .transition(reduceMotion ? .opacity : .move(edge: .top).combined(with: .opacity))
          }
          Text(footnote)
            .scaledFont(.xs3)
            .opacity(0.85)
            .frame(maxHeight: .infinity, alignment: .bottom)
            .padding(.bottom, 14)
        }
        .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .top)
      }
      .foregroundStyle(Color.onMedia)
      .frame(width: 214, height: 454)
      .clipShape(RoundedRectangle(cornerRadius: Radius.xl3, style: .continuous))
      .padding(8)
      .background(Color.media, in: RoundedRectangle(cornerRadius: Radius.xl3 + 8, style: .continuous))
      .accessibilityElement(children: .ignore)
      .accessibilityLabel(Text("Lock screen preview. \(Text(footnote))."))
  }

  private func replay() {
    bannerKey += 1
    withAnimation(reduceMotion ? nil : .timingCurve(0.32, 0.72, 0, 1, duration: 0.8)) { bannerVisible = true }
  }
}

private struct SettingsNotificationsAlert: View {
  let alert: SettingsNotifications.Alert
  let on: Bool
  let action: () -> Void

  var body: some View {
    Button(action: action) {
      VStack(spacing: 8) {
        SettingsNotificationsMini(alert: alert)
        Text(alert.label)
          .scaledFont(.sm)
          .foregroundStyle(Color.label)
          .lineLimit(1)
          .minimumScaleFactor(0.8)
        ZStack {
          Circle()
            .strokeBorder(on ? Color.clear : .separatorStrong, lineWidth: 1.5)
            .background(on ? Color.accent : .clear, in: Circle())
          Ph.check.bold
            .frame(width: 12, height: 12)
            .foregroundStyle(Color.onAccent)
            .scaleEffect(on ? 1 : 0)
        }
        .frame(width: 22, height: 22)
        .animation(.spring(response: 0.25, dampingFraction: 0.6), value: on)
      }
      .padding(.top, 14)
      .padding(.bottom, 12)
      .frame(maxWidth: .infinity)
      .contentShape(Rectangle())
    }
    .buttonStyle(.plain)
    .accessibilityElement(children: .ignore)
    .accessibilityLabel(Text(alert.label))
    .accessibilityAddTraits(on ? [.isButton, .isSelected] : .isButton)
  }
}

private struct SettingsNotificationsMini: View {
  let alert: SettingsNotifications.Alert

  var body: some View {
    let shape = RoundedRectangle(cornerRadius: Radius.xl, style: .continuous)
    ZStack(alignment: .top) {
      Color.indigo
      if alert == .lock {
        Text(verbatim: "9:41")
          .scaledFont(.sm, weight: .semibold)
          .foregroundStyle(Color.onMedia)
          .padding(.top, 14)
      }
      ForEach(Array(alert.bars.enumerated()), id: \.offset) { index, top in
        RoundedRectangle(cornerRadius: Radius.xs, style: .continuous)
          .fill(Color.onMedia)
          .frame(height: 13)
          .opacity(1 - Double(index) * 0.15)
          .shadow(Shadow(color: Color.media.opacity(0.15), radius: 1.5, y: 1))
          .padding(.horizontal, 8)
          .padding(.top, top)
      }
    }
    .frame(width: 64, height: 92)
    .clipShape(shape)
    .overlay { shape.strokeBorder(Color.label, lineWidth: 2) }
    .accessibilityHidden(true)
  }
}

private struct SettingsNotificationsCard: View {
  let message: LocalizedStringKey
  let stacked: Bool

  var body: some View {
    ZStack(alignment: .bottom) {
      if stacked {
        RoundedRectangle(cornerRadius: Radius.xl2, style: .continuous)
          .fill(Color.onMedia.opacity(0.55))
          .frame(height: 20)
          .padding(.horizontal, 10)
          .offset(y: 6)
      }
      HStack(alignment: .top, spacing: 10) {
        Ph.chatCircle.fill
          .frame(width: 18, height: 18)
          .foregroundStyle(Color.onMedia)
          .frame(width: 30, height: 30)
          .background(Color.green, in: RoundedRectangle(cornerRadius: Radius.md, style: .continuous))
        VStack(alignment: .leading, spacing: 1) {
          HStack {
            Text(verbatim: "Riley Morgan")
              .scaledFont(.xs2, weight: .semibold)
              .frame(maxWidth: .infinity, alignment: .leading)
            Text("now")
              .scaledFont(.xs3)
              .foregroundStyle(Color.media.opacity(0.55))
          }
          Text(message)
            .scaledFont(.xs2)
            .fixedSize(horizontal: false, vertical: true)
        }
      }
      .foregroundStyle(Color.media.opacity(0.88))
      .padding(.horizontal, 12)
      .padding(.vertical, 10)
      .background(Color.onMedia.opacity(0.82), in: RoundedRectangle(cornerRadius: Radius.xl2, style: .continuous))
    }
  }
}
```

```kt title="kotlin/blocks/SettingsNotifications.kt"
package com.esuiss.ui.blocks

import androidx.compose.animation.AnimatedVisibility
import androidx.compose.animation.animateColorAsState
import androidx.compose.animation.core.CubicBezierEasing
import androidx.compose.animation.core.animateFloatAsState
import androidx.compose.animation.core.tween
import androidx.compose.animation.fadeIn
import androidx.compose.animation.fadeOut
import androidx.compose.animation.slideInVertically
import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.offset
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.selection.toggleable
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.foundation.verticalScroll
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.key
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.mutableStateMapOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.clearAndSetSemantics
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.disabled
import androidx.compose.ui.semantics.heading
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Bold
import com.adamglin.phosphoricons.Fill
import com.adamglin.phosphoricons.bold.Check
import com.adamglin.phosphoricons.fill.ChatCircle
import com.esuiss.ui.components.Icon
import com.esuiss.ui.components.Item
import com.esuiss.ui.components.ItemActions
import com.esuiss.ui.components.ItemContent
import com.esuiss.ui.components.ItemGroup
import com.esuiss.ui.components.ItemGroupVariant
import com.esuiss.ui.components.ItemSeparator
import com.esuiss.ui.components.ItemSize
import com.esuiss.ui.components.ItemTitle
import com.esuiss.ui.components.Screen
import com.esuiss.ui.components.SelectSize
import com.esuiss.ui.components.Switch
import com.esuiss.ui.components.ToggleGroup
import com.esuiss.ui.components.ToggleGroupItem
import com.esuiss.ui.components.ToggleSize
import com.esuiss.ui.patterns.Picker
import com.esuiss.ui.patterns.PickerItemData
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Shadow
import com.esuiss.ui.theme.Typography
import com.esuiss.ui.theme.shadow
import kotlinx.coroutines.delay

private val PopEasing = CubicBezierEasing(0.3f, 1.25f, 0.5f, 1f)

private val RevealEasing = CubicBezierEasing(0.32f, 0.72f, 0f, 1f)

private enum class AlertKind(val label: String, val bars: List<Int>) {
    Lock("Lock Screen", listOf(58, 74)),
    Center("Notification Center", listOf(12, 29, 46, 63)),
    Banner("Banners", listOf(8)),
}

private val PreviewOptions = listOf("Always", "When Unlocked", "Never").map { PickerItemData(it, it) }

private val GroupingOptions = listOf("Automatic", "By App", "Off").map { PickerItemData(it, it) }

private fun bannerFootnote(allow: Boolean, banner: Boolean, style: String): String = when {
    !allow -> "Notifications are off"
    !banner -> "No banners"
    style == "persistent" -> "Banner stays until dismissed"
    else -> "Banner shows briefly"
}

@Composable
fun SettingsNotifications(modifier: Modifier = Modifier) {
    val colors = EsuissTheme.colors
    var allow by rememberSaveable { mutableStateOf(true) }
    val enabled = remember { mutableStateMapOf(AlertKind.Lock to true, AlertKind.Center to true, AlertKind.Banner to true) }
    var bannerStyle by rememberSaveable { mutableStateOf("temporary") }
    var sounds by rememberSaveable { mutableStateOf(true) }
    var badges by rememberSaveable { mutableStateOf(true) }
    var previews by rememberSaveable { mutableStateOf("Always") }
    var grouping by rememberSaveable { mutableStateOf("Automatic") }
    var bannerKey by remember { mutableIntStateOf(0) }
    var bannerVisible by remember { mutableStateOf(true) }

    LaunchedEffect(bannerStyle, bannerVisible, bannerKey) {
        if (bannerStyle != "temporary" || !bannerVisible) return@LaunchedEffect
        delay(2600)
        bannerVisible = false
    }

    fun replay() {
        bannerKey += 1
        bannerVisible = true
    }

    val body = if (previews == "Never") "Notification" else "Is the weekend trip to the coast still on?"
    val footnote = bannerFootnote(allow, enabled.getValue(AlertKind.Banner), bannerStyle)
    val dim by animateFloatAsState(if (allow) 1f else 0.35f, tween(300), label = "dim")

    Screen(modifier) {
        Column(
            Modifier
                .fillMaxSize()
                .verticalScroll(rememberScrollState())
                .padding(horizontal = 20.dp, vertical = 24.dp),
            verticalArrangement = Arrangement.spacedBy(20.dp),
        ) {
            Row(horizontalArrangement = Arrangement.spacedBy(12.dp), verticalAlignment = Alignment.CenterVertically) {
                Box(
                    Modifier
                        .size(40.dp)
                        .background(colors.green, RoundedCornerShape(10.dp)),
                    contentAlignment = Alignment.Center,
                ) {
                    Icon(PhosphorIcons.Fill.ChatCircle, contentDescription = null, size = 24.dp, tint = colors.onAccent)
                }
                Column {
                    BasicText(
                        "Messages",
                        modifier = Modifier.semantics { heading() },
                        style = Typography.xl2.copy(color = colors.label, fontWeight = FontWeight.Bold),
                    )
                    BasicText("Notifications", style = Typography.sm.copy(color = colors.labelSecondary))
                }
            }
            ItemGroup(variant = ItemGroupVariant.Inset) {
                SettingRow("Allow Notifications") {
                    Switch(
                        checked = allow,
                        onCheckedChange = {
                            allow = it
                            replay()
                        },
                    )
                }
            }
            Column(
                modifier = Modifier
                    .graphicsLayer { alpha = dim }
                    .then(if (allow) Modifier else Modifier.clearAndSetSemantics { disabled() }),
                verticalArrangement = Arrangement.spacedBy(8.dp),
            ) {
                SectionTitle("Alerts")
                ItemGroup(variant = ItemGroupVariant.Inset) {
                    Row(Modifier.padding(horizontal = 8.dp)) {
                        AlertKind.entries.forEach { kind ->
                            AlertTile(
                                kind = kind,
                                selected = enabled.getValue(kind),
                                enabled = allow,
                                modifier = Modifier.weight(1f),
                            ) {
                                enabled[kind] = it
                                replay()
                            }
                        }
                    }
                    if (enabled.getValue(AlertKind.Banner)) {
                        ItemSeparator()
                        SettingRow("Banner Style") {
                            ToggleGroup(
                                value = bannerStyle,
                                onValueChange = { value ->
                                    if (value != null) {
                                        bannerStyle = value
                                        replay()
                                    }
                                },
                                size = ToggleSize.Sm,
                                spacing = 0,
                                enabled = allow,
                            ) {
                                ToggleGroupItem("Temporary", "temporary")
                                ToggleGroupItem("Persistent", "persistent")
                            }
                        }
                    }
                    ItemSeparator()
                    SettingRow("Sounds") { Switch(checked = sounds, onCheckedChange = { sounds = it }, enabled = allow) }
                    ItemSeparator()
                    SettingRow("Badges") { Switch(checked = badges, onCheckedChange = { badges = it }, enabled = allow) }
                }
                SectionTitle("Appearance", Modifier.padding(top = 12.dp))
                ItemGroup(variant = ItemGroupVariant.Inset) {
                    SettingRow("Show Previews") {
                        Picker(
                            value = previews,
                            onValueChange = {
                                previews = it
                                replay()
                            },
                            items = PreviewOptions,
                            size = SelectSize.Sm,
                            enabled = allow,
                        )
                    }
                    ItemSeparator()
                    SettingRow("Notification Grouping") {
                        Picker(
                            value = grouping,
                            onValueChange = { grouping = it },
                            items = GroupingOptions,
                            size = SelectSize.Sm,
                            enabled = allow,
                        )
                    }
                }
            }
            LockScreenPreview(
                showBanner = allow && enabled.getValue(AlertKind.Banner) && bannerVisible,
                showLock = allow && enabled.getValue(AlertKind.Lock),
                stacked = grouping != "Off",
                bannerKey = bannerKey,
                body = body,
                footnote = footnote,
                modifier = Modifier
                    .align(Alignment.CenterHorizontally)
                    .padding(top = 8.dp),
            )
        }
    }
}

@Composable
private fun SectionTitle(text: String, modifier: Modifier = Modifier) {
    BasicText(
        text,
        modifier = modifier
            .padding(horizontal = 4.dp)
            .semantics { heading() },
        style = Typography.sm.copy(color = EsuissTheme.colors.label, fontWeight = FontWeight.SemiBold),
    )
}

@Composable
private fun SettingRow(title: String, action: @Composable () -> Unit) {
    Item(size = ItemSize.Sm) {
        ItemContent {
            ItemTitle {
                BasicText(
                    title,
                    style = Typography.base.copy(color = EsuissTheme.colors.label),
                    maxLines = 1,
                    overflow = TextOverflow.Ellipsis,
                )
            }
        }
        ItemActions { action() }
    }
}

@Composable
private fun AlertTile(
    kind: AlertKind,
    selected: Boolean,
    enabled: Boolean,
    modifier: Modifier = Modifier,
    onSelectedChange: (Boolean) -> Unit,
) {
    val colors = EsuissTheme.colors
    val fill by animateColorAsState(if (selected) colors.accent else Color.Transparent, tween(250), label = "fill")
    val edge by animateColorAsState(if (selected) Color.Transparent else colors.separatorStrong, tween(250), label = "edge")
    val check by animateFloatAsState(if (selected) 1f else 0f, tween(250, easing = PopEasing), label = "check")
    Column(
        modifier = modifier
            .clip(RoundedCornerShape(12.dp))
            .toggleable(
                value = selected,
                interactionSource = remember { MutableInteractionSource() },
                indication = null,
                enabled = enabled,
                role = Role.Checkbox,
                onValueChange = onSelectedChange,
            )
            .padding(top = 14.dp, bottom = 12.dp),
        horizontalAlignment = Alignment.CenterHorizontally,
        verticalArrangement = Arrangement.spacedBy(8.dp),
    ) {
        MiniScreen(kind)
        BasicText(
            kind.label,
            modifier = Modifier.padding(horizontal = 2.dp),
            style = Typography.xs.copy(color = colors.label, textAlign = TextAlign.Center),
            minLines = 2,
            maxLines = 2,
            overflow = TextOverflow.Ellipsis,
        )
        Box(
            Modifier
                .size(22.dp)
                .background(fill, CircleShape)
                .border(1.5.dp, edge, CircleShape),
            contentAlignment = Alignment.Center,
        ) {
            Icon(
                PhosphorIcons.Bold.Check,
                contentDescription = null,
                modifier = Modifier.graphicsLayer {
                    scaleX = check
                    scaleY = check
                },
                size = 12.dp,
                tint = colors.onAccent,
            )
        }
    }
}

@Composable
private fun MiniScreen(kind: AlertKind) {
    val colors = EsuissTheme.colors
    val shape = RoundedCornerShape(12.dp)
    Box(
        Modifier
            .size(width = 64.dp, height = 92.dp)
            .clip(shape)
            .background(colors.indigo, shape)
            .border(2.dp, colors.label, shape)
            .clearAndSetSemantics {},
    ) {
        if (kind == AlertKind.Lock) {
            BasicText(
                "9:41",
                modifier = Modifier
                    .fillMaxWidth()
                    .padding(top = 14.dp),
                style = Typography.sm.copy(color = colors.onMedia, fontWeight = FontWeight.SemiBold, textAlign = TextAlign.Center),
            )
        }
        kind.bars.forEachIndexed { index, top ->
            Box(
                Modifier
                    .offset(y = top.dp)
                    .padding(horizontal = 8.dp)
                    .fillMaxWidth()
                    .height(13.dp)
                    .graphicsLayer { alpha = 1f - index * 0.15f }
                    .background(colors.onMedia, RoundedCornerShape(4.dp)),
            )
        }
    }
}

@Composable
private fun LockScreenPreview(
    showBanner: Boolean,
    showLock: Boolean,
    stacked: Boolean,
    bannerKey: Int,
    body: String,
    footnote: String,
    modifier: Modifier = Modifier,
) {
    val colors = EsuissTheme.colors
    val outer = RoundedCornerShape(42.dp)
    val inner = RoundedCornerShape(34.dp)
    Box(
        modifier = modifier
            .size(width = 230.dp, height = 470.dp)
            .shadow(Shadow(0.dp, 20.dp, 50.dp, colors.media.copy(alpha = 0.4f)), outer)
            .background(colors.media, outer)
            .border(1.5.dp, colors.labelTertiary, outer)
            .padding(8.dp)
            .clip(inner)
            .background(colors.indigo)
            .semantics { contentDescription = "Lock screen preview. $footnote." },
    ) {
        Box(
            Modifier
                .align(Alignment.TopCenter)
                .padding(top = 8.dp)
                .size(width = 74.dp, height = 22.dp)
                .background(colors.media, CircleShape),
        )
        Column(
            Modifier
                .fillMaxWidth()
                .padding(top = 50.dp),
            horizontalAlignment = Alignment.CenterHorizontally,
        ) {
            BasicText(
                "Tuesday, October 6",
                style = Typography.xs.copy(color = colors.onMedia.copy(alpha = 0.9f), fontWeight = FontWeight.SemiBold),
            )
            BasicText(
                "9:41",
                style = Typography.xl3.copy(
                    color = colors.onMedia,
                    fontWeight = FontWeight.SemiBold,
                    fontSize = 60.sp,
                    lineHeight = 60.sp,
                    letterSpacing = (-0.05).sp,
                ),
            )
        }
        key(bannerKey) {
            AnimatedVisibility(
                visible = showBanner,
                modifier = Modifier
                    .padding(top = 38.dp, start = 8.dp, end = 8.dp)
                    .fillMaxWidth(),
                enter = fadeIn(tween(800)) + slideInVertically(tween(800, easing = RevealEasing)) { -it },
                exit = fadeOut(tween(300)),
            ) {
                Notification(body, stacked = false)
            }
        }
        if (showLock) {
            Box(
                Modifier
                    .padding(top = 300.dp, start = 8.dp, end = 8.dp)
                    .fillMaxWidth(),
            ) {
                Notification(body, stacked = stacked)
            }
        }
        BasicText(
            footnote,
            modifier = Modifier
                .align(Alignment.BottomCenter)
                .padding(bottom = 14.dp),
            style = Typography.xs3.copy(color = colors.onMedia.copy(alpha = 0.85f), textAlign = TextAlign.Center),
        )
    }
}

@Composable
private fun Notification(body: String, stacked: Boolean) {
    val colors = EsuissTheme.colors
    val ink = colors.media
    val shape = RoundedCornerShape(18.dp)
    Box {
        if (stacked) {
            Box(
                Modifier
                    .matchParentSize()
                    .padding(horizontal = 10.dp)
                    .offset(y = 6.dp)
                    .background(colors.onMedia.copy(alpha = 0.55f), RoundedCornerShape(16.dp)),
            )
        }
        Row(
            modifier = Modifier
                .fillMaxWidth()
                .background(colors.onMedia, shape)
                .padding(horizontal = 12.dp, vertical = 10.dp),
            horizontalArrangement = Arrangement.spacedBy(10.dp),
        ) {
            Box(
                Modifier
                    .size(30.dp)
                    .background(colors.green, RoundedCornerShape(7.dp)),
                contentAlignment = Alignment.Center,
            ) {
                Icon(PhosphorIcons.Fill.ChatCircle, contentDescription = null, size = 18.dp, tint = colors.onMedia)
            }
            Column(Modifier.weight(1f), verticalArrangement = Arrangement.spacedBy(1.dp)) {
                Row(verticalAlignment = Alignment.CenterVertically) {
                    BasicText(
                        "Riley Morgan",
                        modifier = Modifier.weight(1f),
                        style = Typography.xs.copy(color = ink.copy(alpha = 0.88f), fontWeight = FontWeight.SemiBold),
                    )
                    BasicText("now", style = Typography.xs2.copy(color = ink.copy(alpha = 0.55f)))
                }
                BasicText(body, style = Typography.xs.copy(color = ink.copy(alpha = 0.88f)))
            }
        }
    }
}
```

A wallpaper preview shows a sample notification that reflects the current settings: hidden previews, stacking when grouping is on, and banners that fade out when set to temporary. Below it, `Switch` rows control notifications, sounds and badges, `Toggle` tiles choose Lock Screen, Notification Center and Banners, a `ToggleGroup` picks the banner style, and `Picker` rows set previews and grouping.

## Installation

```bash title="Terminal"
npx @esuiss/uim@latest add settings-notifications
```

```bash title="Terminal"
npx @esuiss/uim@latest add settings-notifications --platform swift
```

```bash title="Terminal"
npx @esuiss/uim@latest add settings-notifications --platform kotlin
```

The CLI also adds what it builds on: [Icon](/docs/components/icon), [Item](/docs/components/item), [Picker](/docs/patterns/picker), [Screen](/docs/components/screen), [Switch](/docs/components/switch), [Text](/docs/components/text), [Toggle](/docs/components/toggle), [Toggle Group](/docs/components/toggle-group).

### Manual

**Uniwind**

1. Install the dependencies:

```bash title="Terminal"
npx expo install cn phosphor-react-native react-native-reanimated react-native-svg react-native-worklets
```

2. Add the pieces it builds on: [Icon](/docs/components/icon), [Item](/docs/components/item), [Picker](/docs/patterns/picker), [Screen](/docs/components/screen), [Switch](/docs/components/switch), [Text](/docs/components/text), [Toggle](/docs/components/toggle), [Toggle Group](/docs/components/toggle-group).

3. Copy the source into `components/blocks/settings-notifications.tsx`:

```tsx title="uniwind/components/blocks/settings-notifications.tsx"
import { cn } from "cn"
import { ChatCircleIcon, CheckIcon } from "phosphor-react-native"
import * as React from "react"
import { Image, ScrollView, View } from "react-native"
import { FadeInUp, ReduceMotion } from "react-native-reanimated"
import { Picker, PickerItem } from "@/components/patterns/picker"
import { AnimatedView } from "@/components/ui/animated-view"
import { Icon } from "@/components/ui/icon"
import {
  Item,
  ItemActions,
  ItemContent,
  ItemGroup,
  ItemSeparator,
  ItemTitle,
} from "@/components/ui/item"
import { Screen } from "@/components/ui/screen"
import { Switch } from "@/components/ui/switch"
import { Text } from "@/components/ui/text"
import { Toggle } from "@/components/ui/toggle"
import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group"

const WALLPAPER =
  "https://images.unsplash.com/photo-1707324148764-99647364afa3?w=600&q=80&auto=format&fit=crop"

type Alert = "lock" | "center" | "banner"

const ALERTS: { value: Alert; label: string }[] = [
  { value: "lock", label: "Lock Screen" },
  { value: "center", label: "Notification Center" },
  { value: "banner", label: "Banners" },
]

const PREVIEW_OPTIONS = ["Always", "When Unlocked", "Never"]

const GROUPING_OPTIONS = ["Automatic", "By App", "Off"]

const MINI_SCREEN_BARS: Record<Alert, number[]> = {
  lock: [58, 74],
  center: [12, 29, 46, 63],
  banner: [8],
}

function bannerFootnote(allow: boolean, banner: boolean, style: string) {
  if (!allow) return "Notifications are off"
  if (!banner) return "No banners"
  return style === "persistent"
    ? "Banner stays until dismissed"
    : "Banner shows briefly"
}

function MiniScreen({ kind }: { kind: Alert }) {
  return (
    <View
      accessible={false}
      importantForAccessibility="no-hide-descendants"
      className="h-23 w-16 overflow-hidden rounded-xl border-2 border-label bg-indigo"
    >
      {kind === "lock" ? (
        <Text className="absolute inset-x-0 top-3 text-center text-sm font-semibold text-on-media">
          9:41
        </Text>
      ) : null}
      {MINI_SCREEN_BARS[kind].map((top, index) => (
        <View
          key={top}
          style={{ top: top - 2, opacity: 1 - index * 0.15 }}
          className="absolute inset-x-1.5 h-3.25 rounded-sm bg-on-media"
        />
      ))}
    </View>
  )
}

function Notification({ body, stacked }: { body: string; stacked?: boolean }) {
  return (
    <AnimatedView
      entering={FadeInUp.duration(600).reduceMotion(ReduceMotion.System)}
    >
      {stacked ? (
        <View className="absolute inset-x-2.5 -bottom-1.5 h-5 rounded-2xl bg-surface-raised opacity-55" />
      ) : null}
      <View className="flex-row gap-2.5 rounded-[1.125rem] bg-surface-raised px-3 py-2.5 opacity-95">
        <View className="size-7.5 shrink-0 items-center justify-center rounded-[7px] bg-green">
          <Icon
            as={ChatCircleIcon}
            weight="fill"
            className="size-4.5 text-on-accent"
          />
        </View>
        <View className="min-w-0 flex-1 gap-px">
          <View className="flex-row items-center gap-1.5">
            <Text className="flex-1 text-xs font-semibold">Riley Morgan</Text>
            <Text className="text-2xs text-label-secondary">now</Text>
          </View>
          <Text className="text-xs">{body}</Text>
        </View>
      </View>
    </AnimatedView>
  )
}

function SwitchRow({
  id,
  label,
  checked,
  onCheckedChange,
}: {
  id: string
  label: string
  checked: boolean
  onCheckedChange: (checked: boolean) => void
}) {
  return (
    <Item size="sm">
      <ItemContent>
        <ItemTitle nativeID={id} className="font-normal">
          {label}
        </ItemTitle>
      </ItemContent>
      <ItemActions>
        <Switch
          checked={checked}
          onCheckedChange={onCheckedChange}
          accessibilityLabelledBy={id}
        />
      </ItemActions>
    </Item>
  )
}

function SettingsNotifications() {
  const [allow, setAllow] = React.useState(true)
  const [enabled, setEnabled] = React.useState<Record<Alert, boolean>>({
    lock: true,
    center: true,
    banner: true,
  })
  const [bannerStyle, setBannerStyle] = React.useState("temporary")
  const [sounds, setSounds] = React.useState(true)
  const [badges, setBadges] = React.useState(true)
  const [previews, setPreviews] = React.useState("Always")
  const [grouping, setGrouping] = React.useState("Automatic")
  const [bannerKey, setBannerKey] = React.useState(0)
  const [bannerVisible, setBannerVisible] = React.useState(true)

  React.useEffect(() => {
    if (bannerStyle !== "temporary" || !bannerVisible) return
    const timer = setTimeout(() => setBannerVisible(false), 2600)
    return () => clearTimeout(timer)
  }, [bannerStyle, bannerVisible])

  const replay = () => {
    setBannerKey((key) => key + 1)
    setBannerVisible(true)
  }

  const body =
    previews === "Never"
      ? "Notification"
      : "Is the weekend trip to the coast still on?"
  const footnote = bannerFootnote(allow, enabled.banner, bannerStyle)

  const selects = [
    {
      label: "Show Previews",
      value: previews,
      options: PREVIEW_OPTIONS,
      onChange: (value: string) => {
        setPreviews(value)
        replay()
      },
    },
    {
      label: "Notification Grouping",
      value: grouping,
      options: GROUPING_OPTIONS,
      onChange: setGrouping,
    },
  ]

  return (
    <Screen edges={["top", "right", "left"]}>
      <ScrollView contentContainerClassName="gap-5 px-4 pt-4 pb-8">
        <View className="flex-row items-center gap-3">
          <View className="size-10 items-center justify-center rounded-[0.625rem] bg-green">
            <Icon
              as={ChatCircleIcon}
              weight="fill"
              className="size-6 text-on-accent"
            />
          </View>
          <View>
            <Text role="heading" className="text-2xl font-bold">
              Messages
            </Text>
            <Text className="text-sm text-label-secondary">Notifications</Text>
          </View>
        </View>
        <View
          accessible
          accessibilityRole="image"
          accessibilityLabel={`Lock screen preview. ${footnote}.`}
          className="h-75 overflow-hidden rounded-3xl bg-media"
        >
          <Image
            source={{ uri: WALLPAPER }}
            resizeMode="cover"
            accessibilityIgnoresInvertColors
            className="absolute inset-0 size-full"
          />
          <View className="absolute inset-0 bg-scrim opacity-40" />
          <View className="absolute inset-x-0 top-10 items-center">
            <Text className="text-xs font-semibold text-on-media opacity-90">
              Tuesday, October 6
            </Text>
            <Text className="text-3xl font-semibold text-on-media">9:41</Text>
          </View>
          {allow && enabled.banner && bannerVisible ? (
            <View key={bannerKey} className="absolute inset-x-2 top-2">
              <Notification body={body} />
            </View>
          ) : null}
          {allow && enabled.lock ? (
            <View className="absolute inset-x-2 top-40">
              <Notification body={body} stacked={grouping !== "Off"} />
            </View>
          ) : null}
          <Text className="absolute inset-x-0 bottom-3.5 text-center text-2xs text-on-media opacity-85">
            {footnote}
          </Text>
        </View>
        <ItemGroup variant="inset">
          <SwitchRow
            id="settings-notifications-allow"
            label="Allow Notifications"
            checked={allow}
            onCheckedChange={(value) => {
              setAllow(value)
              replay()
            }}
          />
        </ItemGroup>
        <View
          style={{ pointerEvents: allow ? "auto" : "none" }}
          accessibilityState={{ disabled: !allow }}
          className={cn("gap-5", !allow && "opacity-35")}
        >
          <Text role="heading" className="-mb-3 px-1 text-sm font-semibold">
            Alerts
          </Text>
          <ItemGroup variant="inset">
            <View className="flex-row px-2">
              {ALERTS.map((alert) => {
                const on = enabled[alert.value]
                return (
                  <Toggle
                    key={alert.value}
                    pressed={on}
                    onPressedChange={(pressed) => {
                      setEnabled((current) => ({
                        ...current,
                        [alert.value]: pressed,
                      }))
                      replay()
                    }}
                    accessibilityLabel={alert.label}
                    className="h-auto flex-1 flex-col gap-2 rounded-xl bg-transparent pt-3.5 pb-3 active:bg-transparent"
                  >
                    <MiniScreen kind={alert.value} />
                    <Text className="text-center text-sm text-label">
                      {alert.label}
                    </Text>
                    <View
                      className={cn(
                        "size-5.5 items-center justify-center rounded-full border-[1.5px]",
                        on
                          ? "border-transparent bg-accent"
                          : "border-separator-strong"
                      )}
                    >
                      {on ? (
                        <Icon
                          as={CheckIcon}
                          weight="bold"
                          className="size-3 text-on-accent"
                        />
                      ) : null}
                    </View>
                  </Toggle>
                )
              })}
            </View>
            {enabled.banner ? (
              <>
                <ItemSeparator />
                <Item size="sm">
                  <ItemContent>
                    <ItemTitle className="font-normal">Banner Style</ItemTitle>
                  </ItemContent>
                  <ItemActions>
                    <ToggleGroup
                      spacing={0}
                      size="sm"
                      value={[bannerStyle]}
                      onValueChange={(value) => {
                        if (!value[0]) return
                        setBannerStyle(value[0])
                        replay()
                      }}
                      accessibilityLabel="Banner style"
                    >
                      <ToggleGroupItem value="temporary">
                        <Text>Temporary</Text>
                      </ToggleGroupItem>
                      <ToggleGroupItem value="persistent">
                        <Text>Persistent</Text>
                      </ToggleGroupItem>
                    </ToggleGroup>
                  </ItemActions>
                </Item>
              </>
            ) : null}
            <ItemSeparator />
            <SwitchRow
              id="settings-notifications-sounds"
              label="Sounds"
              checked={sounds}
              onCheckedChange={setSounds}
            />
            <ItemSeparator />
            <SwitchRow
              id="settings-notifications-badges"
              label="Badges"
              checked={badges}
              onCheckedChange={setBadges}
            />
          </ItemGroup>
          <Text role="heading" className="-mb-3 px-1 text-sm font-semibold">
            Appearance
          </Text>
          <ItemGroup variant="inset">
            {selects.map((row, index) => (
              <React.Fragment key={row.label}>
                {index > 0 ? <ItemSeparator /> : null}
                <Item size="sm" className="py-1.5">
                  <ItemContent>
                    <ItemTitle className="font-normal">{row.label}</ItemTitle>
                  </ItemContent>
                  <ItemActions>
                    <Picker
                      size="sm"
                      value={row.value}
                      onValueChange={row.onChange}
                      accessibilityLabel={row.label}
                      className="bg-transparent px-1"
                    >
                      {row.options.map((option) => (
                        <PickerItem key={option} value={option}>
                          {option}
                        </PickerItem>
                      ))}
                    </Picker>
                  </ItemActions>
                </Item>
              </React.Fragment>
            ))}
          </ItemGroup>
        </View>
      </ScrollView>
    </Screen>
  )
}

export { SettingsNotifications }
```

4. Update the import paths to match your project.

**NativeWind**

1. Install the dependencies:

```bash title="Terminal"
npx expo install cn phosphor-react-native react-native-reanimated react-native-svg react-native-worklets
```

2. Add the pieces it builds on: [Icon](/docs/components/icon), [Item](/docs/components/item), [Picker](/docs/patterns/picker), [Screen](/docs/components/screen), [Switch](/docs/components/switch), [Text](/docs/components/text), [Toggle](/docs/components/toggle), [Toggle Group](/docs/components/toggle-group).

3. Copy the source into `components/blocks/settings-notifications.tsx`:

```tsx title="nativewind/components/blocks/settings-notifications.tsx"
import { cn } from "cn"
import { ChatCircleIcon, CheckIcon } from "phosphor-react-native"
import * as React from "react"
import { Image, ScrollView, View } from "react-native"
import { FadeInUp, ReduceMotion } from "react-native-reanimated"
import { Picker, PickerItem } from "@/components/patterns/picker"
import { AnimatedView } from "@/components/ui/animated-view"
import { Icon } from "@/components/ui/icon"
import {
  Item,
  ItemActions,
  ItemContent,
  ItemGroup,
  ItemSeparator,
  ItemTitle,
} from "@/components/ui/item"
import { Screen } from "@/components/ui/screen"
import { Switch } from "@/components/ui/switch"
import { Text } from "@/components/ui/text"
import { Toggle } from "@/components/ui/toggle"
import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group"

const WALLPAPER =
  "https://images.unsplash.com/photo-1707324148764-99647364afa3?w=600&q=80&auto=format&fit=crop"

type Alert = "lock" | "center" | "banner"

const ALERTS: { value: Alert; label: string }[] = [
  { value: "lock", label: "Lock Screen" },
  { value: "center", label: "Notification Center" },
  { value: "banner", label: "Banners" },
]

const PREVIEW_OPTIONS = ["Always", "When Unlocked", "Never"]

const GROUPING_OPTIONS = ["Automatic", "By App", "Off"]

const MINI_SCREEN_BARS: Record<Alert, number[]> = {
  lock: [58, 74],
  center: [12, 29, 46, 63],
  banner: [8],
}

function bannerFootnote(allow: boolean, banner: boolean, style: string) {
  if (!allow) return "Notifications are off"
  if (!banner) return "No banners"
  return style === "persistent"
    ? "Banner stays until dismissed"
    : "Banner shows briefly"
}

function MiniScreen({ kind }: { kind: Alert }) {
  return (
    <View
      accessible={false}
      importantForAccessibility="no-hide-descendants"
      className="h-[5.75rem] w-16 overflow-hidden rounded-xl border-2 border-label bg-indigo"
    >
      {kind === "lock" ? (
        <Text className="absolute inset-x-0 top-3 text-center text-sm font-semibold text-on-media">
          9:41
        </Text>
      ) : null}
      {MINI_SCREEN_BARS[kind].map((top, index) => (
        <View
          key={top}
          style={{ top: top - 2, opacity: 1 - index * 0.15 }}
          className="absolute inset-x-1.5 h-[0.8125rem] rounded-sm bg-on-media"
        />
      ))}
    </View>
  )
}

function Notification({ body, stacked }: { body: string; stacked?: boolean }) {
  return (
    <AnimatedView
      entering={FadeInUp.duration(600).reduceMotion(ReduceMotion.System)}
    >
      {stacked ? (
        <View className="absolute inset-x-2.5 -bottom-1.5 h-5 rounded-2xl bg-surface-raised opacity-55" />
      ) : null}
      <View className="flex-row gap-2.5 rounded-[1.125rem] bg-surface-raised px-3 py-2.5 opacity-95">
        <View className="size-[1.875rem] shrink-0 items-center justify-center rounded-[7px] bg-green">
          <Icon
            as={ChatCircleIcon}
            weight="fill"
            className="size-[1.125rem] text-on-accent"
          />
        </View>
        <View className="min-w-0 flex-1 gap-px">
          <View className="flex-row items-center gap-1.5">
            <Text className="flex-1 text-xs font-semibold">Riley Morgan</Text>
            <Text className="text-2xs text-label-secondary">now</Text>
          </View>
          <Text className="text-xs">{body}</Text>
        </View>
      </View>
    </AnimatedView>
  )
}

function SwitchRow({
  id,
  label,
  checked,
  onCheckedChange,
}: {
  id: string
  label: string
  checked: boolean
  onCheckedChange: (checked: boolean) => void
}) {
  return (
    <Item size="sm">
      <ItemContent>
        <ItemTitle nativeID={id} className="font-normal">
          {label}
        </ItemTitle>
      </ItemContent>
      <ItemActions>
        <Switch
          checked={checked}
          onCheckedChange={onCheckedChange}
          accessibilityLabelledBy={id}
        />
      </ItemActions>
    </Item>
  )
}

function SettingsNotifications() {
  const [allow, setAllow] = React.useState(true)
  const [enabled, setEnabled] = React.useState<Record<Alert, boolean>>({
    lock: true,
    center: true,
    banner: true,
  })
  const [bannerStyle, setBannerStyle] = React.useState("temporary")
  const [sounds, setSounds] = React.useState(true)
  const [badges, setBadges] = React.useState(true)
  const [previews, setPreviews] = React.useState("Always")
  const [grouping, setGrouping] = React.useState("Automatic")
  const [bannerKey, setBannerKey] = React.useState(0)
  const [bannerVisible, setBannerVisible] = React.useState(true)

  React.useEffect(() => {
    if (bannerStyle !== "temporary" || !bannerVisible) return
    const timer = setTimeout(() => setBannerVisible(false), 2600)
    return () => clearTimeout(timer)
  }, [bannerStyle, bannerVisible])

  const replay = () => {
    setBannerKey((key) => key + 1)
    setBannerVisible(true)
  }

  const body =
    previews === "Never"
      ? "Notification"
      : "Is the weekend trip to the coast still on?"
  const footnote = bannerFootnote(allow, enabled.banner, bannerStyle)

  const selects = [
    {
      label: "Show Previews",
      value: previews,
      options: PREVIEW_OPTIONS,
      onChange: (value: string) => {
        setPreviews(value)
        replay()
      },
    },
    {
      label: "Notification Grouping",
      value: grouping,
      options: GROUPING_OPTIONS,
      onChange: setGrouping,
    },
  ]

  return (
    <Screen edges={["top", "right", "left"]}>
      <ScrollView contentContainerClassName="gap-5 px-4 pt-4 pb-8">
        <View className="flex-row items-center gap-3">
          <View className="size-10 items-center justify-center rounded-[0.625rem] bg-green">
            <Icon
              as={ChatCircleIcon}
              weight="fill"
              className="size-6 text-on-accent"
            />
          </View>
          <View>
            <Text role="heading" className="text-2xl font-bold">
              Messages
            </Text>
            <Text className="text-sm text-label-secondary">Notifications</Text>
          </View>
        </View>
        <View
          accessible
          accessibilityRole="image"
          accessibilityLabel={`Lock screen preview. ${footnote}.`}
          className="h-[18.75rem] overflow-hidden rounded-3xl bg-media"
        >
          <Image
            source={{ uri: WALLPAPER }}
            resizeMode="cover"
            accessibilityIgnoresInvertColors
            className="absolute inset-0 size-full"
          />
          <View className="absolute inset-0 bg-scrim opacity-40" />
          <View className="absolute inset-x-0 top-10 items-center">
            <Text className="text-xs font-semibold text-on-media opacity-90">
              Tuesday, October 6
            </Text>
            <Text className="text-3xl font-semibold text-on-media">9:41</Text>
          </View>
          {allow && enabled.banner && bannerVisible ? (
            <View key={bannerKey} className="absolute inset-x-2 top-2">
              <Notification body={body} />
            </View>
          ) : null}
          {allow && enabled.lock ? (
            <View className="absolute inset-x-2 top-40">
              <Notification body={body} stacked={grouping !== "Off"} />
            </View>
          ) : null}
          <Text className="absolute inset-x-0 bottom-3.5 text-center text-2xs text-on-media opacity-85">
            {footnote}
          </Text>
        </View>
        <ItemGroup variant="inset">
          <SwitchRow
            id="settings-notifications-allow"
            label="Allow Notifications"
            checked={allow}
            onCheckedChange={(value) => {
              setAllow(value)
              replay()
            }}
          />
        </ItemGroup>
        <View
          style={{ pointerEvents: allow ? "auto" : "none" }}
          accessibilityState={{ disabled: !allow }}
          className={cn("gap-5", !allow && "opacity-35")}
        >
          <Text role="heading" className="-mb-3 px-1 text-sm font-semibold">
            Alerts
          </Text>
          <ItemGroup variant="inset">
            <View className="flex-row px-2">
              {ALERTS.map((alert) => {
                const on = enabled[alert.value]
                return (
                  <Toggle
                    key={alert.value}
                    pressed={on}
                    onPressedChange={(pressed) => {
                      setEnabled((current) => ({
                        ...current,
                        [alert.value]: pressed,
                      }))
                      replay()
                    }}
                    accessibilityLabel={alert.label}
                    className="h-auto flex-1 flex-col gap-2 rounded-xl bg-transparent pt-3.5 pb-3 active:bg-transparent"
                  >
                    <MiniScreen kind={alert.value} />
                    <Text className="text-center text-sm text-label">
                      {alert.label}
                    </Text>
                    <View
                      className={cn(
                        "size-[1.375rem] items-center justify-center rounded-full border-[1.5px]",
                        on
                          ? "border-transparent bg-accent"
                          : "border-separator-strong"
                      )}
                    >
                      {on ? (
                        <Icon
                          as={CheckIcon}
                          weight="bold"
                          className="size-3 text-on-accent"
                        />
                      ) : null}
                    </View>
                  </Toggle>
                )
              })}
            </View>
            {enabled.banner ? (
              <>
                <ItemSeparator />
                <Item size="sm">
                  <ItemContent>
                    <ItemTitle className="font-normal">Banner Style</ItemTitle>
                  </ItemContent>
                  <ItemActions>
                    <ToggleGroup
                      spacing={0}
                      size="sm"
                      value={[bannerStyle]}
                      onValueChange={(value) => {
                        if (!value[0]) return
                        setBannerStyle(value[0])
                        replay()
                      }}
                      accessibilityLabel="Banner style"
                    >
                      <ToggleGroupItem value="temporary">
                        <Text>Temporary</Text>
                      </ToggleGroupItem>
                      <ToggleGroupItem value="persistent">
                        <Text>Persistent</Text>
                      </ToggleGroupItem>
                    </ToggleGroup>
                  </ItemActions>
                </Item>
              </>
            ) : null}
            <ItemSeparator />
            <SwitchRow
              id="settings-notifications-sounds"
              label="Sounds"
              checked={sounds}
              onCheckedChange={setSounds}
            />
            <ItemSeparator />
            <SwitchRow
              id="settings-notifications-badges"
              label="Badges"
              checked={badges}
              onCheckedChange={setBadges}
            />
          </ItemGroup>
          <Text role="heading" className="-mb-3 px-1 text-sm font-semibold">
            Appearance
          </Text>
          <ItemGroup variant="inset">
            {selects.map((row, index) => (
              <React.Fragment key={row.label}>
                {index > 0 ? <ItemSeparator /> : null}
                <Item size="sm" className="py-1.5">
                  <ItemContent>
                    <ItemTitle className="font-normal">{row.label}</ItemTitle>
                  </ItemContent>
                  <ItemActions>
                    <Picker
                      size="sm"
                      value={row.value}
                      onValueChange={row.onChange}
                      accessibilityLabel={row.label}
                      className="bg-transparent px-1"
                    >
                      {row.options.map((option) => (
                        <PickerItem key={option} value={option}>
                          {option}
                        </PickerItem>
                      ))}
                    </Picker>
                  </ItemActions>
                </Item>
              </React.Fragment>
            ))}
          </ItemGroup>
        </View>
      </ScrollView>
    </Screen>
  )
}

export { SettingsNotifications }
```

4. Update the import paths to match your project.

**StyleSheet**

1. Install the dependencies:

```bash title="Terminal"
npx expo install phosphor-react-native react-native-reanimated react-native-svg react-native-worklets
```

2. Add the pieces it builds on: [Icon](/docs/components/icon), [Item](/docs/components/item), [Picker](/docs/patterns/picker), [Screen](/docs/components/screen), [Switch](/docs/components/switch), [Text](/docs/components/text), [Toggle](/docs/components/toggle), [Toggle Group](/docs/components/toggle-group).

3. Copy the source into `components/blocks/settings-notifications.tsx`:

```tsx title="stylesheet/components/blocks/settings-notifications.tsx"
import { ChatCircleIcon, CheckIcon } from "phosphor-react-native"
import * as React from "react"
import { Image, ScrollView, StyleSheet, View } from "react-native"
import { FadeInUp, ReduceMotion } from "react-native-reanimated"
import { Picker, PickerItem } from "@/components/patterns/picker"
import { AnimatedView } from "@/components/ui/animated-view"
import { Icon } from "@/components/ui/icon"
import {
  Item,
  ItemActions,
  ItemContent,
  ItemGroup,
  ItemSeparator,
  ItemTitle,
} from "@/components/ui/item"
import { Screen } from "@/components/ui/screen"
import { Switch } from "@/components/ui/switch"
import { Text } from "@/components/ui/text"
import { fontSize, radius, useTheme } from "@/components/ui/theme"
import { Toggle } from "@/components/ui/toggle"
import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group"

const WALLPAPER =
  "https://images.unsplash.com/photo-1707324148764-99647364afa3?w=600&q=80&auto=format&fit=crop"

type Alert = "lock" | "center" | "banner"

const ALERTS: { value: Alert; label: string }[] = [
  { value: "lock", label: "Lock Screen" },
  { value: "center", label: "Notification Center" },
  { value: "banner", label: "Banners" },
]

const PREVIEW_OPTIONS = ["Always", "When Unlocked", "Never"]

const GROUPING_OPTIONS = ["Automatic", "By App", "Off"]

const MINI_SCREEN_BARS: Record<Alert, number[]> = {
  lock: [58, 74],
  center: [12, 29, 46, 63],
  banner: [8],
}

const styles = StyleSheet.create({
  mini: {
    height: 92,
    width: 64,
    overflow: "hidden",
    borderRadius: radius.xl,
    borderWidth: 2,
  },
  miniTime: {
    ...fontSize.sm,
    position: "absolute",
    left: 0,
    right: 0,
    top: 12,
    textAlign: "center",
    fontWeight: "600",
  },
  miniBar: {
    position: "absolute",
    left: 6,
    right: 6,
    height: 13,
    borderRadius: radius.sm,
  },
  stack: {
    position: "absolute",
    left: 10,
    right: 10,
    bottom: -6,
    height: 20,
    borderRadius: radius["2xl"],
    opacity: 0.55,
  },
  card: {
    flexDirection: "row",
    gap: 10,
    borderRadius: 18,
    paddingHorizontal: 12,
    paddingVertical: 10,
    opacity: 0.95,
  },
  appIcon: {
    width: 30,
    height: 30,
    flexShrink: 0,
    alignItems: "center",
    justifyContent: "center",
    borderRadius: 7,
  },
  cardBody: { minWidth: 0, flex: 1, gap: 1 },
  cardHeader: { flexDirection: "row", alignItems: "center", gap: 6 },
  content: {
    gap: 20,
    paddingHorizontal: 16,
    paddingTop: 16,
    paddingBottom: 32,
  },
  appHeader: { flexDirection: "row", alignItems: "center", gap: 12 },
  appTile: {
    width: 40,
    height: 40,
    alignItems: "center",
    justifyContent: "center",
    borderRadius: 10,
  },
  preview: { height: 300, overflow: "hidden", borderRadius: radius["3xl"] },
  clock: {
    position: "absolute",
    left: 0,
    right: 0,
    top: 40,
    alignItems: "center",
  },
  footnote: {
    ...fontSize["2xs"],
    position: "absolute",
    left: 0,
    right: 0,
    bottom: 14,
    textAlign: "center",
    opacity: 0.85,
  },
  section: { ...fontSize.sm, marginBottom: -12, paddingHorizontal: 4 },
  alerts: { flexDirection: "row", paddingHorizontal: 8 },
  alert: {
    height: "auto",
    flex: 1,
    flexDirection: "column",
    gap: 8,
    borderRadius: radius.xl,
    paddingTop: 14,
    paddingBottom: 12,
    backgroundColor: "transparent",
  },
  checkCircle: {
    width: 22,
    height: 22,
    alignItems: "center",
    justifyContent: "center",
    borderRadius: radius.full,
    borderWidth: 1.5,
  },
})

function bannerFootnote(allow: boolean, banner: boolean, style: string) {
  if (!allow) return "Notifications are off"
  if (!banner) return "No banners"
  return style === "persistent"
    ? "Banner stays until dismissed"
    : "Banner shows briefly"
}

function MiniScreen({ kind }: { kind: Alert }) {
  const { colors } = useTheme()
  return (
    <View
      accessible={false}
      importantForAccessibility="no-hide-descendants"
      style={[
        styles.mini,
        { borderColor: colors.label, backgroundColor: colors.indigo },
      ]}
    >
      {kind === "lock" ? (
        <Text style={[styles.miniTime, { color: colors.onMedia }]}>9:41</Text>
      ) : null}
      {MINI_SCREEN_BARS[kind].map((top, index) => (
        <View
          key={top}
          style={[
            styles.miniBar,
            {
              top: top - 2,
              opacity: 1 - index * 0.15,
              backgroundColor: colors.onMedia,
            },
          ]}
        />
      ))}
    </View>
  )
}

function Notification({ body, stacked }: { body: string; stacked?: boolean }) {
  const { colors } = useTheme()
  return (
    <AnimatedView
      entering={FadeInUp.duration(600).reduceMotion(ReduceMotion.System)}
    >
      {stacked ? (
        <View
          style={[styles.stack, { backgroundColor: colors.surfaceRaised }]}
        />
      ) : null}
      <View style={[styles.card, { backgroundColor: colors.surfaceRaised }]}>
        <View style={[styles.appIcon, { backgroundColor: colors.green }]}>
          <Icon
            as={ChatCircleIcon}
            weight="fill"
            size={18}
            color={colors.onAccent}
          />
        </View>
        <View style={styles.cardBody}>
          <View style={styles.cardHeader}>
            <Text style={[fontSize.xs, { flex: 1, fontWeight: "600" }]}>
              Riley Morgan
            </Text>
            <Text style={[fontSize["2xs"], { color: colors.labelSecondary }]}>
              now
            </Text>
          </View>
          <Text style={fontSize.xs}>{body}</Text>
        </View>
      </View>
    </AnimatedView>
  )
}

function SwitchRow({
  id,
  label,
  checked,
  onCheckedChange,
}: {
  id: string
  label: string
  checked: boolean
  onCheckedChange: (checked: boolean) => void
}) {
  return (
    <Item size="sm">
      <ItemContent>
        <ItemTitle nativeID={id} style={{ fontWeight: "400" }}>
          {label}
        </ItemTitle>
      </ItemContent>
      <ItemActions>
        <Switch
          checked={checked}
          onCheckedChange={onCheckedChange}
          accessibilityLabelledBy={id}
        />
      </ItemActions>
    </Item>
  )
}

function SettingsNotifications() {
  const { colors } = useTheme()
  const [allow, setAllow] = React.useState(true)
  const [enabled, setEnabled] = React.useState<Record<Alert, boolean>>({
    lock: true,
    center: true,
    banner: true,
  })
  const [bannerStyle, setBannerStyle] = React.useState("temporary")
  const [sounds, setSounds] = React.useState(true)
  const [badges, setBadges] = React.useState(true)
  const [previews, setPreviews] = React.useState("Always")
  const [grouping, setGrouping] = React.useState("Automatic")
  const [bannerKey, setBannerKey] = React.useState(0)
  const [bannerVisible, setBannerVisible] = React.useState(true)

  React.useEffect(() => {
    if (bannerStyle !== "temporary" || !bannerVisible) return
    const timer = setTimeout(() => setBannerVisible(false), 2600)
    return () => clearTimeout(timer)
  }, [bannerStyle, bannerVisible])

  const replay = () => {
    setBannerKey((key) => key + 1)
    setBannerVisible(true)
  }

  const body =
    previews === "Never"
      ? "Notification"
      : "Is the weekend trip to the coast still on?"
  const footnote = bannerFootnote(allow, enabled.banner, bannerStyle)

  const selects = [
    {
      label: "Show Previews",
      value: previews,
      options: PREVIEW_OPTIONS,
      onChange: (value: string) => {
        setPreviews(value)
        replay()
      },
    },
    {
      label: "Notification Grouping",
      value: grouping,
      options: GROUPING_OPTIONS,
      onChange: setGrouping,
    },
  ]

  return (
    <Screen edges={["top", "right", "left"]}>
      <ScrollView contentContainerStyle={styles.content}>
        <View style={styles.appHeader}>
          <View style={[styles.appTile, { backgroundColor: colors.green }]}>
            <Icon
              as={ChatCircleIcon}
              weight="fill"
              size={24}
              color={colors.onAccent}
            />
          </View>
          <View>
            <Text
              role="heading"
              style={[fontSize["2xl"], { fontWeight: "700" }]}
            >
              Messages
            </Text>
            <Text style={[fontSize.sm, { color: colors.labelSecondary }]}>
              Notifications
            </Text>
          </View>
        </View>
        <View
          accessible
          accessibilityRole="image"
          accessibilityLabel={`Lock screen preview. ${footnote}.`}
          style={[styles.preview, { backgroundColor: colors.media }]}
        >
          <Image
            source={{ uri: WALLPAPER }}
            resizeMode="cover"
            accessibilityIgnoresInvertColors
            style={[StyleSheet.absoluteFill, { width: "100%", height: "100%" }]}
          />
          <View
            style={[
              StyleSheet.absoluteFill,
              { backgroundColor: colors.scrim, opacity: 0.4 },
            ]}
          />
          <View style={styles.clock}>
            <Text
              style={[
                fontSize.xs,
                { fontWeight: "600", color: colors.onMedia, opacity: 0.9 },
              ]}
            >
              Tuesday, October 6
            </Text>
            <Text
              style={[
                fontSize["3xl"],
                { fontWeight: "600", color: colors.onMedia },
              ]}
            >
              9:41
            </Text>
          </View>
          {allow && enabled.banner && bannerVisible ? (
            <View
              key={bannerKey}
              style={{ position: "absolute", left: 8, right: 8, top: 8 }}
            >
              <Notification body={body} />
            </View>
          ) : null}
          {allow && enabled.lock ? (
            <View style={{ position: "absolute", left: 8, right: 8, top: 160 }}>
              <Notification body={body} stacked={grouping !== "Off"} />
            </View>
          ) : null}
          <Text style={[styles.footnote, { color: colors.onMedia }]}>
            {footnote}
          </Text>
        </View>
        <ItemGroup variant="inset">
          <SwitchRow
            id="settings-notifications-allow"
            label="Allow Notifications"
            checked={allow}
            onCheckedChange={(value) => {
              setAllow(value)
              replay()
            }}
          />
        </ItemGroup>
        <View
          accessibilityState={{ disabled: !allow }}
          style={[
            { gap: 20, pointerEvents: allow ? "auto" : "none" },
            !allow && { opacity: 0.35 },
          ]}
        >
          <Text role="heading" style={[styles.section, { fontWeight: "600" }]}>
            Alerts
          </Text>
          <ItemGroup variant="inset">
            <View style={styles.alerts}>
              {ALERTS.map((alert) => {
                const on = enabled[alert.value]
                return (
                  <Toggle
                    key={alert.value}
                    pressed={on}
                    onPressedChange={(pressed) => {
                      setEnabled((current) => ({
                        ...current,
                        [alert.value]: pressed,
                      }))
                      replay()
                    }}
                    accessibilityLabel={alert.label}
                    style={styles.alert}
                  >
                    <MiniScreen kind={alert.value} />
                    <Text
                      style={[
                        fontSize.sm,
                        { textAlign: "center", color: colors.label },
                      ]}
                    >
                      {alert.label}
                    </Text>
                    <View
                      style={[
                        styles.checkCircle,
                        on
                          ? {
                              borderColor: "transparent",
                              backgroundColor: colors.accent,
                            }
                          : { borderColor: colors.separatorStrong },
                      ]}
                    >
                      {on ? (
                        <Icon
                          as={CheckIcon}
                          weight="bold"
                          size={12}
                          color={colors.onAccent}
                        />
                      ) : null}
                    </View>
                  </Toggle>
                )
              })}
            </View>
            {enabled.banner ? (
              <>
                <ItemSeparator />
                <Item size="sm">
                  <ItemContent>
                    <ItemTitle style={{ fontWeight: "400" }}>
                      Banner Style
                    </ItemTitle>
                  </ItemContent>
                  <ItemActions>
                    <ToggleGroup
                      spacing={0}
                      size="sm"
                      value={[bannerStyle]}
                      onValueChange={(value) => {
                        if (!value[0]) return
                        setBannerStyle(value[0])
                        replay()
                      }}
                      accessibilityLabel="Banner style"
                    >
                      <ToggleGroupItem value="temporary">
                        <Text>Temporary</Text>
                      </ToggleGroupItem>
                      <ToggleGroupItem value="persistent">
                        <Text>Persistent</Text>
                      </ToggleGroupItem>
                    </ToggleGroup>
                  </ItemActions>
                </Item>
              </>
            ) : null}
            <ItemSeparator />
            <SwitchRow
              id="settings-notifications-sounds"
              label="Sounds"
              checked={sounds}
              onCheckedChange={setSounds}
            />
            <ItemSeparator />
            <SwitchRow
              id="settings-notifications-badges"
              label="Badges"
              checked={badges}
              onCheckedChange={setBadges}
            />
          </ItemGroup>
          <Text role="heading" style={[styles.section, { fontWeight: "600" }]}>
            Appearance
          </Text>
          <ItemGroup variant="inset">
            {selects.map((row, index) => (
              <React.Fragment key={row.label}>
                {index > 0 ? <ItemSeparator /> : null}
                <Item size="sm" style={{ paddingVertical: 6 }}>
                  <ItemContent>
                    <ItemTitle style={{ fontWeight: "400" }}>
                      {row.label}
                    </ItemTitle>
                  </ItemContent>
                  <ItemActions>
                    <Picker
                      size="sm"
                      value={row.value}
                      onValueChange={row.onChange}
                      accessibilityLabel={row.label}
                      style={{
                        backgroundColor: "transparent",
                        paddingHorizontal: 4,
                      }}
                    >
                      {row.options.map((option) => (
                        <PickerItem key={option} value={option}>
                          {option}
                        </PickerItem>
                      ))}
                    </Picker>
                  </ItemActions>
                </Item>
              </React.Fragment>
            ))}
          </ItemGroup>
        </View>
      </ScrollView>
    </Screen>
  )
}

export { SettingsNotifications }
```

4. Update the import paths to match your project.

**SwiftUI**

1. Target iOS 17 or later.

2. Add the Swift package to your app:

```swift title="Package.swift"
.package(url: "https://github.com/phosphor-icons/swift", from: "2.1.0")
```

3. Copy the theme files every view uses:

```swift title="swift/Theme/Theme.swift"
import SwiftUI
import UIKit

struct RGBA: Sendable {
  let red: CGFloat
  let green: CGFloat
  let blue: CGFloat
  let alpha: CGFloat

  init(_ hex: UInt32, _ alpha: CGFloat = 1) {
    red = CGFloat((hex >> 16) & 0xFF) / 255
    green = CGFloat((hex >> 8) & 0xFF) / 255
    blue = CGFloat(hex & 0xFF) / 255
    self.alpha = alpha
  }

  var uiColor: UIColor {
    UIColor(red: red, green: green, blue: blue, alpha: alpha)
  }
}

extension Color {
  static func adaptive(light: RGBA, dark: RGBA) -> Color {
    let lightColor = light.uiColor
    let darkColor = dark.uiColor
    return Color(uiColor: UIColor { traits in
      traits.userInterfaceStyle == .dark ? darkColor : lightColor
    })
  }
}

public struct TextStyle: Sendable, Hashable {
  public let size: CGFloat
  public let lineHeight: CGFloat
  public let letterSpacing: CGFloat

  public init(size: CGFloat, lineHeight: CGFloat, letterSpacing: CGFloat) {
    self.size = size
    self.lineHeight = lineHeight
    self.letterSpacing = letterSpacing
  }

  public func font(weight: Font.Weight = .regular) -> Font {
    .system(size: size, weight: weight)
  }

  public var lineSpacing: CGFloat {
    max(0, lineHeight - UIFont.systemFont(ofSize: size).lineHeight)
  }
}

extension Hashable where Self == Font {
  public static func textStyle(_ style: TextStyle, weight: Font.Weight = .regular) -> Font {
    style.font(weight: weight)
  }
}

private struct TextStyleModifier: ViewModifier {
  let style: TextStyle
  let weight: Font.Weight

  func body(content: Content) -> some View {
    content
      .font(style.font(weight: weight))
      .tracking(style.letterSpacing)
      .lineSpacing(style.lineSpacing)
      .padding(.vertical, style.lineSpacing / 2)
  }
}

extension View {
  public func textStyle(_ style: TextStyle, weight: Font.Weight = .regular) -> some View {
    modifier(TextStyleModifier(style: style, weight: weight))
  }
}

public struct Shadow: Sendable, Hashable {
  public let color: Color
  public let radius: CGFloat
  public let x: CGFloat
  public let y: CGFloat

  public init(color: Color, radius: CGFloat, x: CGFloat = 0, y: CGFloat = 0) {
    self.color = color
    self.radius = radius
    self.x = x
    self.y = y
  }
}

extension View {
  public func shadow(_ shadow: Shadow) -> some View {
    self.shadow(color: shadow.color, radius: shadow.radius, x: shadow.x, y: shadow.y)
  }
}
```

```swift title="swift/Theme/Tokens.swift"
import SwiftUI

extension Color {
  public static let surface = Color.adaptive(light: .init(0xFFFFFF), dark: .init(0x000000))
  public static let surfaceSecondary = Color.adaptive(light: .init(0xF5F5F7), dark: .init(0x161617))
  public static let surfaceTertiary = Color.adaptive(light: .init(0xE8E8ED), dark: .init(0x2C2C2E))
  public static let surfaceRaised = Color.adaptive(light: .init(0xFFFFFF), dark: .init(0x1D1D1F))
  public static let label = Color.adaptive(light: .init(0x1D1D1F), dark: .init(0xF5F5F7))
  public static let labelSecondary = Color.adaptive(light: .init(0x6E6E73), dark: .init(0xA1A1A6))
  public static let labelTertiary = Color.adaptive(light: .init(0x86868B), dark: .init(0x86868B))
  public static let labelQuaternary = Color.adaptive(light: .init(0xD2D2D7), dark: .init(0x424245))
  public static let control = Color.adaptive(light: .init(0x000000, 0.04), dark: .init(0xFFFFFF, 0.1))
  public static let controlPressed = Color.adaptive(light: .init(0x000000, 0.12), dark: .init(0xFFFFFF, 0.22))
  public static let controlSelected = Color.adaptive(light: .init(0x1D1D1F), dark: .init(0xF5F5F7))
  public static let controlDisabled = Color.adaptive(light: .init(0x000000, 0.03), dark: .init(0xFFFFFF, 0.05))
  public static let onControlSelected = Color.adaptive(light: .init(0xFFFFFF), dark: .init(0x000000))
  public static let itemPressed = Color.adaptive(light: .init(0x000000, 0.08), dark: .init(0xFFFFFF, 0.12))
  public static let itemSelected = Color.adaptive(light: .init(0x000000, 0.06), dark: .init(0xFFFFFF, 0.1))
  public static let separator = Color.adaptive(light: .init(0xD2D2D7), dark: .init(0x424245))
  public static let separatorStrong = Color.adaptive(light: .init(0x86868B), dark: .init(0x6E6E73))
  public static let accent = Color.adaptive(light: .init(0x0071E3), dark: .init(0x0071E3))
  public static let accentPressed = Color.adaptive(light: .init(0x005BB8), dark: .init(0x004D9E))
  public static let accentSelected = Color.adaptive(light: .init(0x0071E3), dark: .init(0x0071E3))
  public static let accentDisabled = Color.adaptive(light: .init(0x0071E3, 0.4), dark: .init(0x0071E3, 0.4))
  public static let onAccent = Color.adaptive(light: .init(0xFFFFFF), dark: .init(0xFFFFFF))
  public static let accentSurface = Color.adaptive(light: .init(0x0071E3, 0.09), dark: .init(0x0071E3, 0.18))
  public static let accentSurfacePressed = Color.adaptive(light: .init(0x0071E3, 0.18), dark: .init(0x0071E3, 0.3))
  public static let link = Color.adaptive(light: .init(0x0066CC), dark: .init(0x2997FF))
  public static let focus = Color.adaptive(light: .init(0x0071E3), dark: .init(0x0071E3))
  public static let scrim = Color.adaptive(light: .init(0x000000, 0.48), dark: .init(0x000000, 0.48))
  public static let media = Color.adaptive(light: .init(0x000000), dark: .init(0x000000))
  public static let onMedia = Color.adaptive(light: .init(0xFFFFFF), dark: .init(0xFFFFFF))
  public static let danger = Color.adaptive(light: .init(0xD0000A), dark: .init(0xFF5447))
  public static let dangerSurface = Color.adaptive(light: .init(0xD70015, 0.08), dark: .init(0xFF453A, 0.2))
  public static let dangerSurfacePressed = Color.adaptive(light: .init(0xD70015, 0.16), dark: .init(0xFF453A, 0.36))
  public static let success = Color.adaptive(light: .init(0x008009), dark: .init(0x30D158))
  public static let successSurface = Color.adaptive(light: .init(0xEFFAF1), dark: .init(0x30D158, 0.16))
  public static let warning = Color.adaptive(light: .init(0xB64400), dark: .init(0xFF9F0A))
  public static let warningSurface = Color.adaptive(light: .init(0xFFF5EA), dark: .init(0xFF9F0A, 0.16))
}

public enum Radius {
  public static let xs: CGFloat = 3
  public static let sm: CGFloat = 5
  public static let md: CGFloat = 8
  public static let lg: CGFloat = 10
  public static let xl: CGFloat = 12
  public static let xl2: CGFloat = 18
  public static let xl3: CGFloat = 28
  public static let full: CGFloat = 9999
}

extension TextStyle {
  public static let xs3 = TextStyle(size: 11, lineHeight: 13, letterSpacing: 0.066)
  public static let xs2 = TextStyle(size: 12, lineHeight: 16, letterSpacing: 0)
  public static let xs = TextStyle(size: 13, lineHeight: 18, letterSpacing: -0.078)
  public static let sm = TextStyle(size: 15, lineHeight: 20, letterSpacing: -0.24)
  public static let md = TextStyle(size: 16, lineHeight: 21, letterSpacing: -0.32)
  public static let base = TextStyle(size: 17, lineHeight: 22, letterSpacing: -0.442)
  public static let lg = TextStyle(size: 20, lineHeight: 25, letterSpacing: -0.46)
  public static let xl = TextStyle(size: 22, lineHeight: 28, letterSpacing: -0.264)
  public static let xl2 = TextStyle(size: 28, lineHeight: 34, letterSpacing: 0.392)
  public static let xl3 = TextStyle(size: 34, lineHeight: 41, letterSpacing: 0.408)

  public static let allCases: [TextStyle] = [.xs3, .xs2, .xs, .sm, .md, .base, .lg, .xl, .xl2, .xl3]
}

extension Shadow {
  public static let md = Shadow(color: .black.opacity(0.08), radius: 6, x: 2, y: 4)
  public static let lg = Shadow(color: .black.opacity(0.12), radius: 12, y: 4)
}
```

4. Copy the source and every file it uses:

```swift title="swift/Blocks/SettingsNotifications.swift"
import PhosphorSwift
import SwiftUI

public struct SettingsNotifications: View {
  enum Alert: String, CaseIterable, Sendable {
    case lock, center, banner

    var label: LocalizedStringKey {
      switch self {
      case .lock: "Lock Screen"
      case .center: "Notification Center"
      case .banner: "Banners"
      }
    }

    var bars: [CGFloat] {
      switch self {
      case .lock: [58, 74]
      case .center: [12, 29, 46, 63]
      case .banner: [8]
      }
    }
  }

  static let wallpaper = URL(string: "https://images.unsplash.com/photo-1707324148764-99647364afa3?w=600&q=80&auto=format&fit=crop")
  static var previewOptions: [String] { ["Always", "When Unlocked", "Never"] }
  static var groupingOptions: [String] { ["Automatic", "By App", "Off"] }

  @State private var allow: Bool
  @State private var enabled: Set<Alert> = Set(Alert.allCases)
  @State private var bannerStyle: String? = "temporary"
  @State private var sounds = true
  @State private var badges = true
  @State private var previews: String? = "Always"
  @State private var grouping: String? = "Automatic"
  @State private var bannerKey = 0
  @State private var bannerVisible = true
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  public init() {
    self.init(allow: true)
  }

  init(allow: Bool) {
    _allow = State(initialValue: allow)
  }

  private var footnote: LocalizedStringKey {
    if !allow { return "Notifications are off" }
    if !enabled.contains(.banner) { return "No banners" }
    return bannerStyle == "persistent" ? "Banner stays until dismissed" : "Banner shows briefly"
  }

  private var message: LocalizedStringKey {
    previews == "Never" ? "Notification" : "Is the weekend trip to the coast still on?"
  }

  public var body: some View {
    Screen {
      KeyboardScrollView {
        VStack(alignment: .leading, spacing: 20) {
          heading
          ItemGroup(.inset) {
            switchRow("Allow Notifications", isOn: Binding(
              get: { allow },
              set: { value in
                allow = value
                replay()
              }
            ))
          }
          VStack(alignment: .leading, spacing: 20) {
            sectionTitle("Alerts")
            ItemGroup(.inset) {
              HStack(spacing: 0) {
                ForEach(Alert.allCases, id: \.self) { alert in
                  SettingsNotificationsAlert(alert: alert, on: enabled.contains(alert)) {
                    if enabled.contains(alert) {
                      enabled.remove(alert)
                    } else {
                      enabled.insert(alert)
                    }
                    replay()
                  }
                }
              }
              .padding(.horizontal, 8)
              if enabled.contains(.banner) {
                ItemSeparator()
                Item(size: .sm) {
                  ItemContent {
                    ItemTitle { Text("Banner Style").fontWeight(.regular) }
                  }
                  ItemActions {
                    ToggleGroup(selection: Binding(
                      get: { bannerStyle },
                      set: { value in
                        guard let value else { return }
                        bannerStyle = value
                        replay()
                      }
                    ), size: .sm, spacing: 0) {
                      ToggleGroupItem("Temporary", value: "temporary")
                      ToggleGroupItem("Persistent", value: "persistent")
                    }
                    .accessibilityLabel(Text("Banner style"))
                  }
                }
              }
              ItemSeparator()
              switchRow("Sounds", isOn: $sounds)
              ItemSeparator()
              switchRow("Badges", isOn: $badges)
            }
            sectionTitle("Appearance")
            ItemGroup(.inset) {
              pickerRow("Show Previews", selection: Binding(
                get: { previews },
                set: { value in
                  previews = value
                  replay()
                }
              ), options: Self.previewOptions)
              ItemSeparator()
              pickerRow("Notification Grouping", selection: $grouping, options: Self.groupingOptions)
            }
          }
          .disabled(!allow)
          .opacity(allow ? 1 : 0.35)
          .animation(.easeInOut(duration: 0.3), value: allow)
          lockScreen
            .frame(maxWidth: .infinity)
            .padding(.vertical, 20)
            .background(Color.surfaceSecondary, in: RoundedRectangle(cornerRadius: Radius.xl3, style: .continuous))
        }
        .padding(.horizontal, 20)
        .padding(.vertical, 24)
      }
    }
    .task(id: [bannerStyle == "temporary", bannerVisible, bannerKey != 0]) {
      guard bannerStyle == "temporary", bannerVisible else { return }
      try? await Task.sleep(for: .milliseconds(2600))
      guard !Task.isCancelled else { return }
      withAnimation(reduceMotion ? nil : .easeOut(duration: 0.4)) { bannerVisible = false }
    }
  }

  private var heading: some View {
    HStack(spacing: 12) {
      Ph.chatCircle.fill
        .frame(width: 24, height: 24)
        .foregroundStyle(Color.onAccent)
        .frame(width: 40, height: 40)
        .background(Color.green, in: RoundedRectangle(cornerRadius: Radius.lg, style: .continuous))
        .accessibilityHidden(true)
      VStack(alignment: .leading, spacing: 0) {
        Text("Messages")
          .scaledFont(.xl2, weight: .bold)
          .accessibilityAddTraits(.isHeader)
        Text("Notifications")
          .scaledFont(.sm)
          .foregroundStyle(Color.labelSecondary)
      }
    }
  }

  private func sectionTitle(_ title: LocalizedStringKey) -> some View {
    Text(title)
      .scaledFont(.sm, weight: .semibold)
      .padding(.horizontal, 4)
      .padding(.bottom, -12)
      .accessibilityAddTraits(.isHeader)
  }

  private func switchRow(_ title: LocalizedStringKey, isOn: Binding<Bool>) -> some View {
    Item(size: .sm) {
      ItemContent {
        ItemTitle { Text(title).fontWeight(.regular) }
      }
      ItemActions {
        Toggle(isOn: isOn) { Text(title) }
          .labelsHidden()
          .accessibilityLabel(Text(title))
          .toggleStyle(SwitchStyle())
      }
    }
  }

  private func pickerRow(_ title: LocalizedStringKey, selection: Binding<String?>, options: [String]) -> some View {
    Item(size: .sm) {
      ItemContent {
        ItemTitle { Text(title).fontWeight(.regular) }
      }
      ItemActions {
        OptionPicker(selection: selection, size: .sm) {
          ForEach(options, id: \.self) { option in
            OptionPickerItem(LocalizedStringKey(option), value: option)
          }
        }
        .fixedSize()
        .accessibilityLabel(Text(title))
      }
    }
  }

  private var lockScreen: some View {
    Color.media
      .overlay {
        AsyncImage(url: Self.wallpaper) { phase in
          if let image = phase.image {
            image.resizable().scaledToFill()
          }
        }
      }
      .overlay {
        LinearGradient(colors: [Color.media.opacity(0.15), Color.media.opacity(0.35)], startPoint: .top, endPoint: .bottom)
      }
      .overlay(alignment: .top) {
        ZStack(alignment: .top) {
          Capsule()
            .fill(Color.media)
            .frame(width: 74, height: 22)
            .padding(.top, 8)
          VStack(spacing: 0) {
            Text("Tuesday, October 6")
              .scaledFont(.xs2, weight: .semibold)
              .opacity(0.9)
            Text(verbatim: "9:41")
              .font(.system(size: 60, weight: .semibold))
              .tracking(-2)
          }
          .padding(.top, 50)
          if allow && enabled.contains(.lock) {
            SettingsNotificationsCard(message: message, stacked: grouping != "Off")
              .padding(.horizontal, 8)
              .padding(.top, 300)
          }
          if allow && enabled.contains(.banner) && bannerVisible {
            SettingsNotificationsCard(message: message, stacked: false)
              .id(bannerKey)
              .padding(.horizontal, 8)
              .padding(.top, 38)
              .transition(reduceMotion ? .opacity : .move(edge: .top).combined(with: .opacity))
          }
          Text(footnote)
            .scaledFont(.xs3)
            .opacity(0.85)
            .frame(maxHeight: .infinity, alignment: .bottom)
            .padding(.bottom, 14)
        }
        .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .top)
      }
      .foregroundStyle(Color.onMedia)
      .frame(width: 214, height: 454)
      .clipShape(RoundedRectangle(cornerRadius: Radius.xl3, style: .continuous))
      .padding(8)
      .background(Color.media, in: RoundedRectangle(cornerRadius: Radius.xl3 + 8, style: .continuous))
      .accessibilityElement(children: .ignore)
      .accessibilityLabel(Text("Lock screen preview. \(Text(footnote))."))
  }

  private func replay() {
    bannerKey += 1
    withAnimation(reduceMotion ? nil : .timingCurve(0.32, 0.72, 0, 1, duration: 0.8)) { bannerVisible = true }
  }
}

private struct SettingsNotificationsAlert: View {
  let alert: SettingsNotifications.Alert
  let on: Bool
  let action: () -> Void

  var body: some View {
    Button(action: action) {
      VStack(spacing: 8) {
        SettingsNotificationsMini(alert: alert)
        Text(alert.label)
          .scaledFont(.sm)
          .foregroundStyle(Color.label)
          .lineLimit(1)
          .minimumScaleFactor(0.8)
        ZStack {
          Circle()
            .strokeBorder(on ? Color.clear : .separatorStrong, lineWidth: 1.5)
            .background(on ? Color.accent : .clear, in: Circle())
          Ph.check.bold
            .frame(width: 12, height: 12)
            .foregroundStyle(Color.onAccent)
            .scaleEffect(on ? 1 : 0)
        }
        .frame(width: 22, height: 22)
        .animation(.spring(response: 0.25, dampingFraction: 0.6), value: on)
      }
      .padding(.top, 14)
      .padding(.bottom, 12)
      .frame(maxWidth: .infinity)
      .contentShape(Rectangle())
    }
    .buttonStyle(.plain)
    .accessibilityElement(children: .ignore)
    .accessibilityLabel(Text(alert.label))
    .accessibilityAddTraits(on ? [.isButton, .isSelected] : .isButton)
  }
}

private struct SettingsNotificationsMini: View {
  let alert: SettingsNotifications.Alert

  var body: some View {
    let shape = RoundedRectangle(cornerRadius: Radius.xl, style: .continuous)
    ZStack(alignment: .top) {
      Color.indigo
      if alert == .lock {
        Text(verbatim: "9:41")
          .scaledFont(.sm, weight: .semibold)
          .foregroundStyle(Color.onMedia)
          .padding(.top, 14)
      }
      ForEach(Array(alert.bars.enumerated()), id: \.offset) { index, top in
        RoundedRectangle(cornerRadius: Radius.xs, style: .continuous)
          .fill(Color.onMedia)
          .frame(height: 13)
          .opacity(1 - Double(index) * 0.15)
          .shadow(Shadow(color: Color.media.opacity(0.15), radius: 1.5, y: 1))
          .padding(.horizontal, 8)
          .padding(.top, top)
      }
    }
    .frame(width: 64, height: 92)
    .clipShape(shape)
    .overlay { shape.strokeBorder(Color.label, lineWidth: 2) }
    .accessibilityHidden(true)
  }
}

private struct SettingsNotificationsCard: View {
  let message: LocalizedStringKey
  let stacked: Bool

  var body: some View {
    ZStack(alignment: .bottom) {
      if stacked {
        RoundedRectangle(cornerRadius: Radius.xl2, style: .continuous)
          .fill(Color.onMedia.opacity(0.55))
          .frame(height: 20)
          .padding(.horizontal, 10)
          .offset(y: 6)
      }
      HStack(alignment: .top, spacing: 10) {
        Ph.chatCircle.fill
          .frame(width: 18, height: 18)
          .foregroundStyle(Color.onMedia)
          .frame(width: 30, height: 30)
          .background(Color.green, in: RoundedRectangle(cornerRadius: Radius.md, style: .continuous))
        VStack(alignment: .leading, spacing: 1) {
          HStack {
            Text(verbatim: "Riley Morgan")
              .scaledFont(.xs2, weight: .semibold)
              .frame(maxWidth: .infinity, alignment: .leading)
            Text("now")
              .scaledFont(.xs3)
              .foregroundStyle(Color.media.opacity(0.55))
          }
          Text(message)
            .scaledFont(.xs2)
            .fixedSize(horizontal: false, vertical: true)
        }
      }
      .foregroundStyle(Color.media.opacity(0.88))
      .padding(.horizontal, 12)
      .padding(.vertical, 10)
      .background(Color.onMedia.opacity(0.82), in: RoundedRectangle(cornerRadius: Radius.xl2, style: .continuous))
    }
  }
}
```

```swift title="swift/Components/Button.swift"
import SwiftUI

public struct VariantButtonStyle: ButtonStyle {
  public enum Variant: CaseIterable, Sendable {
    case `default`, outline, secondary, tinted, ghost, plain, destructive, link
  }

  public enum Size: CaseIterable, Sendable {
    case `default`, xs, sm, lg, xl, icon, iconXs, iconSm, iconLg, iconXl

    var height: CGFloat {
      switch self {
      case .xs, .iconXs: 24
      case .sm, .iconSm: 32
      case .default, .icon: 36
      case .lg, .iconLg: 44
      case .xl, .iconXl: 56
      }
    }

    var horizontalPadding: CGFloat {
      switch self {
      case .xs: 11
      case .sm: 12
      case .default: 16
      case .lg: 22
      case .xl: 31
      case .icon, .iconXs, .iconSm, .iconLg, .iconXl: 0
      }
    }

    var spacing: CGFloat {
      switch self {
      case .xs, .sm, .iconXs, .iconSm: 4
      case .xl, .iconXl: 8
      default: 6
      }
    }

    var textStyle: TextStyle {
      switch self {
      case .xs, .iconXs: .xs2
      case .lg, .xl: .base
      default: .sm
      }
    }

    public var iconSize: CGFloat {
      switch self {
      case .xs, .iconXs: 12
      default: 16
      }
    }

    var blockRadius: CGFloat {
      switch self {
      case .xs, .iconXs: Radius.sm
      case .lg, .iconLg: Radius.lg
      case .xl, .iconXl: Radius.xl
      default: Radius.md
      }
    }

    var isIcon: Bool {
      switch self {
      case .icon, .iconXs, .iconSm, .iconLg, .iconXl: true
      default: false
      }
    }
  }

  let variant: Variant
  let size: Size
  let block: Bool
  var metrics: ButtonMetrics?

  public init(_ variant: Variant = .default, size: Size = .default, block: Bool = false) {
    self.variant = variant
    self.size = size
    self.block = block
  }

  init(_ variant: Variant, size: Size, metrics: ButtonMetrics) {
    self.variant = variant
    self.size = size
    self.block = false
    self.metrics = metrics
  }

  public func makeBody(configuration: Configuration) -> some View {
    StyledButton(configuration: configuration, variant: variant, size: size, block: block, metrics: metrics)
  }
}

struct ButtonMetrics: Sendable {
  var horizontalPadding: CGFloat
  var spacing: CGFloat
  var iconSize: CGFloat
  var textStyle: TextStyle
}

private struct StyledButton: View {
  let configuration: ButtonStyleConfiguration
  let variant: VariantButtonStyle.Variant
  let size: VariantButtonStyle.Size
  let block: Bool
  let metrics: ButtonMetrics?

  @Environment(\.colorScheme) private var colorScheme
  @Environment(\.isEnabled) private var isEnabled
  @Environment(\.buttonGroup) private var group

  var body: some View {
    let joined = group != nil && variant != .ghost && variant != .plain
    let rounded = RoundedRectangle(
      cornerRadius: block ? size.blockRadius : Radius.full,
      style: .continuous
    )
    let shape = joined ? AnyShape(Rectangle()) : AnyShape(rounded)
    configuration.label
      .labelStyle(ButtonLabelStyle(spacing: metrics?.spacing ?? size.spacing, iconSize: metrics?.iconSize ?? size.iconSize))
    .font((metrics?.textStyle ?? size.textStyle).font())
    .tracking((metrics?.textStyle ?? size.textStyle).letterSpacing)
    .underline(variant == .link && pressed && isEnabled)
    .lineLimit(1)
    .foregroundStyle(foreground)
    .padding(.horizontal, metrics?.horizontalPadding ?? size.horizontalPadding)
    .frame(width: size.isIcon && !block ? size.height : nil, height: size.height)
    .frame(maxWidth: block || group == .vertical ? .infinity : nil)
    .background(background, in: shape)
    .overlay {
      if variant == .outline && !joined {
        rounded.strokeBorder(Color.separator)
      }
    }
    .contentShape(shape)
    .anchorPreference(key: ButtonGroupFramesKey.self, value: .bounds) { anchor in
      joined ? [ButtonGroupFrame(bounds: anchor, outlined: variant == .outline)] : []
    }
  }

  private var isDark: Bool { colorScheme == .dark }
  private var pressed: Bool { configuration.isPressed }

  private var foreground: Color {
    switch variant {
    case .default:
      .onAccent
    case .outline, .secondary, .ghost:
      isEnabled ? .label : .labelQuaternary
    case .tinted, .plain:
      isEnabled ? .link : .link.opacity(0.4)
    case .destructive:
      isEnabled ? .danger : .danger.opacity(0.4)
    case .link:
      isEnabled ? .link : .labelQuaternary
    }
  }

  private var background: Color {
    switch variant {
    case .default:
      !isEnabled ? .accentDisabled : pressed ? .accentPressed : .accent
    case .outline:
      isEnabled && pressed ? .itemPressed : isDark ? .clear : .surface
    case .secondary:
      !isEnabled ? .controlDisabled : pressed ? .controlPressed : .control
    case .tinted:
      isEnabled && pressed ? .accentSurfacePressed : .accentSurface
    case .ghost:
      isEnabled && pressed ? .itemPressed : .clear
    case .plain:
      isEnabled && pressed ? .itemPressed : .clear
    case .destructive:
      isEnabled && pressed ? .dangerSurfacePressed : .dangerSurface
    case .link:
      .clear
    }
  }
}

struct ButtonLabelStyle: LabelStyle {
  let spacing: CGFloat
  let iconSize: CGFloat

  func makeBody(configuration: Configuration) -> some View {
    HStack(spacing: spacing) {
      configuration.icon
        .frame(width: iconSize, height: iconSize)
      configuration.title
    }
  }
}

extension ButtonStyle where Self == VariantButtonStyle {
  public static func variant(
    _ variant: VariantButtonStyle.Variant = .default,
    size: VariantButtonStyle.Size = .default,
    block: Bool = false
  ) -> VariantButtonStyle {
    VariantButtonStyle(variant, size: size, block: block)
  }
}
```

```swift title="swift/Components/ButtonGroup.swift"
import SwiftUI

extension EnvironmentValues {
  @Entry var buttonGroup: Axis? = nil
  @Entry var buttonGroupSize: CGSize = .zero
}

enum ButtonGroupSpace: Hashable {
  case group
}

struct ButtonGroupFrame {
  let bounds: Anchor<CGRect>
  let outlined: Bool
}

struct ButtonGroupFramesKey: PreferenceKey {
  static var defaultValue: [ButtonGroupFrame] { [] }

  static func reduce(value: inout [ButtonGroupFrame], nextValue: () -> [ButtonGroupFrame]) {
    value.append(contentsOf: nextValue())
  }
}

struct ButtonGroupNestedKey: PreferenceKey {
  static var defaultValue: Bool { false }

  static func reduce(value: inout Bool, nextValue: () -> Bool) {
    value = value || nextValue()
  }
}

public struct ButtonGroup<Content: View>: View {
  let orientation: Axis
  let content: Content

  @State private var nested = false
  @State private var size: CGSize = .zero

  public init(orientation: Axis = .horizontal, @ViewBuilder content: () -> Content) {
    self.orientation = orientation
    self.content = content()
  }

  public var body: some View {
    let shape = orientation == .horizontal
      ? AnyShape(Capsule())
      : AnyShape(RoundedRectangle(cornerRadius: Radius.xl2, style: .continuous))
    stack
      .coordinateSpace(.named(ButtonGroupSpace.group))
      .onGeometryChange(for: CGSize.self) { $0.size } action: { size = $0 }
      .environment(\.buttonGroup, nested ? nil : orientation)
      .environment(\.buttonGroupSize, size)
      .onPreferenceChange(ButtonGroupNestedKey.self) { nested = $0 }
      .modifier(ButtonGroupClip(shape: nested ? nil : shape))
      .overlayPreferenceValue(ButtonGroupFramesKey.self) { frames in
        if !nested {
          GeometryReader { proxy in
            outline(frames.map { (proxy[$0.bounds], $0.outlined) }, shape: shape)
          }
        }
      }
      .transformPreference(ButtonGroupFramesKey.self) { $0 = [] }
      .transformPreference(ButtonGroupNestedKey.self) { $0 = true }
      .fixedSize(horizontal: orientation == .vertical, vertical: orientation == .horizontal)
      .accessibilityElement(children: .contain)
  }

  @ViewBuilder private var stack: some View {
    switch orientation {
    case .horizontal:
      HStack(spacing: nested ? 8 : 0) { content }
    case .vertical:
      VStack(spacing: nested ? 8 : 0) { content }
    }
  }

  @ViewBuilder private func outline(_ frames: [(CGRect, Bool)], shape: AnyShape) -> some View {
    if frames.contains(where: \.1) {
      ZStack(alignment: .topLeading) {
        shape
          .stroke(Color.separator, lineWidth: 1)
          .padding(0.5)
          .mask {
            Path { path in
              for (rect, outlined) in frames where outlined {
                path.addRect(rect)
              }
            }
          }
        ForEach(Array(frames.dropLast().enumerated()), id: \.offset) { _, frame in
          if frame.1 {
            divider(frame.0)
          }
        }
      }
      .clipShape(shape)
      .allowsHitTesting(false)
    }
  }

  private func divider(_ rect: CGRect) -> some View {
    let horizontal = orientation == .horizontal
    return Rectangle()
      .fill(Color.separator)
      .frame(width: horizontal ? 1 : rect.width, height: horizontal ? rect.height : 1)
      .position(
        x: horizontal ? rect.maxX - 0.5 : rect.midX,
        y: horizontal ? rect.midY : rect.maxY - 0.5
      )
  }
}

struct ButtonGroupItem<Content: View>: View {
  let radius: CGFloat
  let content: (UnevenRoundedRectangle) -> Content

  @State private var frame: CGRect = .zero
  @Environment(\.buttonGroup) private var group
  @Environment(\.buttonGroupSize) private var groupSize

  init(radius: CGFloat, @ViewBuilder content: @escaping (UnevenRoundedRectangle) -> Content) {
    self.radius = radius
    self.content = content
  }

  var body: some View {
    if let group {
      content(shape(group))
        .onGeometryChange(for: CGRect.self) { $0.frame(in: .named(ButtonGroupSpace.group)) } action: { frame = $0 }
    } else {
      content(UnevenRoundedRectangle(cornerRadii: RectangleCornerRadii(
        topLeading: radius,
        bottomLeading: radius,
        bottomTrailing: radius,
        topTrailing: radius
      ), style: .continuous))
    }
  }

  private func shape(_ group: Axis) -> UnevenRoundedRectangle {
    let horizontal = group == .horizontal
    let first = horizontal ? frame.minX <= 0.5 : frame.minY <= 0.5
    let last = horizontal
      ? frame.maxX >= groupSize.width - 0.5
      : frame.maxY >= groupSize.height - 0.5
    let round = horizontal ? frame.height / 2 : Radius.xl2
    let start: CGFloat = first ? round : 0
    let end: CGFloat = last ? round : 0
    let radii = horizontal
      ? RectangleCornerRadii(topLeading: start, bottomLeading: start, bottomTrailing: end, topTrailing: end)
      : RectangleCornerRadii(topLeading: start, bottomLeading: end, bottomTrailing: end, topTrailing: start)
    return UnevenRoundedRectangle(cornerRadii: radii, style: .continuous)
  }
}

private struct ButtonGroupClip: ViewModifier {
  let shape: AnyShape?

  func body(content: Content) -> some View {
    if let shape {
      content.clipShape(shape)
    } else {
      content
    }
  }
}

public struct ButtonGroupText<Content: View>: View {
  let content: Content

  @Environment(\.buttonGroup) private var group

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    let shape = group == nil ? AnyShape(Capsule()) : AnyShape(Rectangle())
    HStack(spacing: 8) {
      content
    }
    .labelStyle(ButtonLabelStyle(spacing: 8, iconSize: 16))
    .scaledFont(.sm)
    .lineLimit(1)
    .foregroundStyle(Color.label)
    .padding(.horizontal, 10)
    .frame(minHeight: 36)
    .frame(maxWidth: group == .vertical ? .infinity : nil, maxHeight: group == .horizontal ? .infinity : nil)
    .background(Color.control, in: shape)
    .anchorPreference(key: ButtonGroupFramesKey.self, value: .bounds) { anchor in
      group == nil ? [] : [ButtonGroupFrame(bounds: anchor, outlined: false)]
    }
  }
}

extension ButtonGroupText where Content == Text {
  public init(_ title: LocalizedStringKey) {
    self.init { Text(title) }
  }

  public init(verbatim title: String) {
    self.init { Text(verbatim: title) }
  }
}

public struct ButtonGroupSeparator: View {
  let orientation: Axis

  public init(_ orientation: Axis = .vertical) {
    self.orientation = orientation
  }

  public var body: some View {
    let vertical = orientation == .vertical
    Rectangle()
      .fill(Color.label.opacity(0.2))
      .frame(width: vertical ? 1 : nil, height: vertical ? nil : 1)
      .padding(vertical ? .vertical : .horizontal, 9)
      .frame(maxWidth: vertical ? nil : .infinity, maxHeight: vertical ? .infinity : nil)
      .padding(vertical ? .trailing : .bottom, -1)
      .zIndex(1)
      .accessibilityHidden(true)
  }
}
```

```swift title="swift/Components/Checkbox.swift"
import PhosphorSwift
import SwiftUI

extension Shadow {
  static let control = Shadow(color: .black.opacity(0.08), radius: 0.5, y: 0.5)
  static let thumb = Shadow(color: .black.opacity(0.12), radius: 1.5, y: 1)
}

struct SelectionIndicator<Mark: View>: View {
  let checked: Bool
  let pressed: Bool
  let cornerRadius: CGFloat
  let mark: Mark

  @Environment(\.isEnabled) private var isEnabled
  @Environment(\.isInvalid) private var invalid
  @Environment(\.colorScheme) private var colorScheme

  init(checked: Bool, pressed: Bool, cornerRadius: CGFloat, @ViewBuilder mark: () -> Mark) {
    self.checked = checked
    self.pressed = pressed
    self.cornerRadius = cornerRadius
    self.mark = mark()
  }

  var body: some View {
    let shape = RoundedRectangle(cornerRadius: cornerRadius, style: .continuous)
    ZStack {
      shape.fill(fill)
      shape.strokeBorder(border, lineWidth: 1)
      if checked {
        mark
      }
    }
    .frame(width: 16, height: 16)
    .shadow(raised ? .control : Shadow(color: .clear, radius: 0))
  }

  private var isDark: Bool { colorScheme == .dark }

  private var raised: Bool { !checked && isEnabled && !isDark }

  private var fill: Color {
    if checked {
      return !isEnabled ? .accentDisabled : pressed ? .accentPressed : .accent
    }
    if !isEnabled { return .controlDisabled }
    if isDark { return pressed ? .labelTertiary.opacity(0.6) : .labelQuaternary }
    return pressed ? .control : .surface
  }

  private var border: Color {
    if checked {
      return !isEnabled ? .clear : pressed ? .accentPressed : .accent
    }
    if !isEnabled { return isDark ? .clear : .label.opacity(0.1) }
    if invalid { return .danger }
    return isDark ? .clear : .label.opacity(0.25)
  }
}

struct PressReader<Content: View>: ButtonStyle {
  let content: (Bool) -> Content

  init(@ViewBuilder content: @escaping (Bool) -> Content) {
    self.content = content
  }

  func makeBody(configuration: Configuration) -> some View {
    content(configuration.isPressed)
  }
}

public struct CheckboxStyle: ToggleStyle {
  public init() {}

  public func makeBody(configuration: Configuration) -> some View {
    HapticButton(style: PressReader { pressed in
      HStack(spacing: 12) {
        SelectionIndicator(
          checked: configuration.isOn || configuration.isMixed,
          pressed: pressed,
          cornerRadius: 4
        ) {
          (configuration.isMixed ? Ph.minus.regular : Ph.check.regular)
            .frame(width: 14, height: 14)
            .foregroundStyle(Color.onAccent)
        }
        configuration.label
      }
      .contentShape(Rectangle().inset(by: -8))
    }) {
      configuration.isOn.toggle()
      return true
    }
    .accessibilityElement(children: .combine)
    .accessibilityRemoveTraits(.isButton)
    .accessibilityAddTraits(.isToggle)
    .accessibilityValue(
      configuration.isMixed
        ? Text("Mixed")
        : configuration.isOn ? Text("Checked") : Text("Unchecked")
    )
  }
}

extension ToggleStyle where Self == CheckboxStyle {
  public static var checkbox: CheckboxStyle { CheckboxStyle() }
}
```

```swift title="swift/Components/DropdownMenu.swift"
import PhosphorSwift
import SwiftUI

enum MenuPresentation: Sendable {
  case system, popup
}

extension EnvironmentValues {
  @Entry var menuPresentation: MenuPresentation = .system
  @Entry var menuRadio = MenuRadioContext()
}

struct MenuRadioContext: @unchecked Sendable {
  var selected: AnyHashable?
  var select: @MainActor @Sendable (AnyHashable) -> Void = { _ in }
}

public struct DropdownMenu<Label: View, Content: View>: View {
  let side: Edge
  let align: PopupAlignment
  let sideOffset: CGFloat
  let alignOffset: CGFloat
  let external: Binding<Bool>?
  let content: () -> Content
  let label: Label

  @State private var local = false

  public init(
    isPresented: Binding<Bool>? = nil,
    side: Edge = .bottom,
    align: PopupAlignment = .start,
    sideOffset: CGFloat = 4,
    alignOffset: CGFloat = 0,
    @ViewBuilder content: @escaping () -> Content,
    @ViewBuilder label: () -> Label
  ) {
    self.external = isPresented
    self.side = side
    self.align = align
    self.sideOffset = sideOffset
    self.alignOffset = alignOffset
    self.content = content
    self.label = label()
  }

  public var body: some View {
    let binding = external ?? $local
    Button {
      binding.wrappedValue = true
    } label: {
      label
    }
    .accessibilityHint(Text("Opens a menu"))
    .anchoredPopup(
      isPresented: binding,
      side: side,
      align: align,
      sideOffset: sideOffset,
      alignOffset: alignOffset,
      minWidth: 192
    ) {
      MenuPanel(content: content)
    }
  }
}

extension DropdownMenu where Label == Text {
  public init(
    _ title: LocalizedStringKey,
    isPresented: Binding<Bool>? = nil,
    side: Edge = .bottom,
    align: PopupAlignment = .start,
    @ViewBuilder content: @escaping () -> Content
  ) {
    self.init(isPresented: isPresented, side: side, align: align, content: content) { Text(title) }
  }
}

struct MenuPanel<Content: View>: View {
  @ViewBuilder let content: () -> Content

  var body: some View {
    let stack = VStack(alignment: .leading, spacing: 0) {
      content()
    }
    .padding(6)
    ViewThatFits(in: .vertical) {
      stack
      ScrollView { stack }
    }
    .font(TextStyle.base.font())
    .tracking(TextStyle.base.letterSpacing)
    .foregroundStyle(Color.label)
    .environment(\.menuPresentation, .popup)
    .popupSurface(radius: Radius.xl)
    .accessibilityElement(children: .contain)
  }
}

struct MenuRowStyle: ButtonStyle {
  var destructive = false
  var inset = false
  var trailing: CGFloat = 12
  var selected = false

  @Environment(\.isEnabled) private var isEnabled

  func makeBody(configuration: Configuration) -> some View {
    configuration.label
      .labelStyle(ButtonLabelStyle(spacing: 10, iconSize: 16))
      .lineLimit(1)
      .foregroundStyle(!isEnabled ? Color.labelQuaternary : destructive ? .danger : .label)
      .padding(.leading, inset ? 38 : 12)
      .padding(.trailing, trailing)
      .padding(.vertical, 8)
      .frame(maxWidth: .infinity, alignment: .leading)
      .background(background(pressed: configuration.isPressed), in: RoundedRectangle(cornerRadius: Radius.md, style: .continuous))
      .contentShape(Rectangle())
  }

  private func background(pressed: Bool) -> Color {
    if pressed && isEnabled {
      return destructive ? .dangerSurfacePressed : .itemPressed
    }
    return selected ? .itemSelected : .clear
  }
}

private struct MenuCheckmark: View {
  let visible: Bool

  var body: some View {
    Ph.check.regular
      .frame(width: 16, height: 16)
      .opacity(visible ? 1 : 0)
      .padding(.trailing, 8)
      .accessibilityHidden(true)
  }
}

public struct DropdownMenuItem<Label: View>: View {
  public enum Variant: CaseIterable, Sendable {
    case `default`, destructive
  }

  let variant: Variant
  let inset: Bool
  let action: () -> Void
  let label: Label

  @Environment(\.menuPresentation) private var presentation
  @Environment(\.overlayDismiss) private var dismiss

  public init(
    variant: Variant = .default,
    inset: Bool = false,
    action: @escaping () -> Void,
    @ViewBuilder label: () -> Label
  ) {
    self.variant = variant
    self.inset = inset
    self.action = action
    self.label = label()
  }

  public var body: some View {
    if presentation == .system {
      Button(role: variant == .destructive ? .destructive : nil, action: action) {
        label
      }
    } else {
      Button {
        action()
        dismiss?()
      } label: {
        HStack(spacing: 10) {
          label
        }
      }
      .buttonStyle(MenuRowStyle(destructive: variant == .destructive, inset: inset))
    }
  }
}

extension DropdownMenuItem where Label == Text {
  public init(
    _ title: LocalizedStringKey,
    variant: Variant = .default,
    inset: Bool = false,
    action: @escaping () -> Void
  ) {
    self.init(variant: variant, inset: inset, action: action) { Text(title) }
  }
}

extension DropdownMenuItem where Label == SwiftUI.Label<Text, Image> {
  public init(
    _ title: LocalizedStringKey,
    icon: Image,
    variant: Variant = .default,
    action: @escaping () -> Void
  ) {
    self.init(variant: variant, action: action) {
      SwiftUI.Label { Text(title) } icon: { icon }
    }
  }
}

public struct DropdownMenuCheckboxItem<Label: View>: View {
  let isOn: Binding<Bool>
  let inset: Bool
  let label: Label

  @Environment(\.menuPresentation) private var presentation

  public init(isOn: Binding<Bool>, inset: Bool = false, @ViewBuilder label: () -> Label) {
    self.isOn = isOn
    self.inset = inset
    self.label = label()
  }

  public var body: some View {
    if presentation == .system {
      Toggle(isOn: isOn) { label }
    } else {
      Button {
        isOn.wrappedValue.toggle()
      } label: {
        label
      }
      .buttonStyle(MenuRowStyle(inset: inset, trailing: 32))
      .overlay(alignment: .trailing) { MenuCheckmark(visible: isOn.wrappedValue) }
      .accessibilityAddTraits(isOn.wrappedValue ? [.isToggle, .isSelected] : .isToggle)
    }
  }
}

extension DropdownMenuCheckboxItem where Label == Text {
  public init(_ title: LocalizedStringKey, isOn: Binding<Bool>, inset: Bool = false) {
    self.init(isOn: isOn, inset: inset) { Text(title) }
  }
}

public struct DropdownMenuRadioGroup<Content: View>: View {
  let selection: Binding<AnyHashable>
  let content: Content

  public init<Value: Hashable & Sendable>(selection: Binding<Value>, @ViewBuilder content: () -> Content) {
    self.selection = Binding(
      get: { AnyHashable(selection.wrappedValue) },
      set: { value in
        if let value = value.base as? Value { selection.wrappedValue = value }
      }
    )
    self.content = content()
  }

  public var body: some View {
    let binding = selection
    content
      .environment(
        \.menuRadio,
        MenuRadioContext(selected: binding.wrappedValue, select: { binding.wrappedValue = $0 })
      )
  }
}

public struct DropdownMenuRadioItem<Label: View>: View {
  let value: AnyHashable
  let inset: Bool
  let label: Label

  @Environment(\.menuPresentation) private var presentation
  @Environment(\.menuRadio) private var radio

  public init<Value: Hashable & Sendable>(value: Value, inset: Bool = false, @ViewBuilder label: () -> Label) {
    self.value = AnyHashable(value)
    self.inset = inset
    self.label = label()
  }

  public var body: some View {
    let selected = radio.selected == value
    if presentation == .system {
      let radio = radio
      let value = value
      Toggle(isOn: Binding(get: { selected }, set: { if $0 { radio.select(value) } })) { label }
    } else {
      Button {
        radio.select(value)
      } label: {
        label
      }
      .buttonStyle(MenuRowStyle(inset: inset, trailing: 32))
      .overlay(alignment: .trailing) { MenuCheckmark(visible: selected) }
      .accessibilityAddTraits(selected ? .isSelected : [])
    }
  }
}

extension DropdownMenuRadioItem where Label == Text {
  public init<Value: Hashable & Sendable>(_ title: LocalizedStringKey, value: Value, inset: Bool = false) {
    self.init(value: value, inset: inset) { Text(title) }
  }
}

public struct DropdownMenuLabel: View {
  let title: LocalizedStringKey
  let inset: Bool

  @Environment(\.menuPresentation) private var presentation

  public init(_ title: LocalizedStringKey, inset: Bool = false) {
    self.title = title
    self.inset = inset
  }

  public var body: some View {
    if presentation == .system {
      Text(title)
    } else {
      Text(title)
        .font(TextStyle.xs.font(weight: .semibold))
        .tracking(TextStyle.xs.letterSpacing)
        .foregroundStyle(Color.labelSecondary)
        .padding(.leading, inset ? 38 : 12)
        .padding(.trailing, 12)
        .padding(.vertical, 10)
        .frame(maxWidth: .infinity, alignment: .leading)
        .accessibilityAddTraits(.isHeader)
    }
  }
}

public struct DropdownMenuGroup<Content: View>: View {
  let content: Content

  @Environment(\.menuPresentation) private var presentation

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    if presentation == .system {
      Section { content }
    } else {
      VStack(alignment: .leading, spacing: 0) { content }
    }
  }
}

public struct DropdownMenuSeparator: View {
  @Environment(\.menuPresentation) private var presentation

  public init() {}

  public var body: some View {
    if presentation == .system {
      Divider()
    } else {
      Rectangle()
        .fill(Color.separator.opacity(0.5))
        .frame(height: 1)
        .padding(.vertical, 6)
        .padding(.horizontal, -6)
        .accessibilityHidden(true)
    }
  }
}

public struct DropdownMenuSub<Label: View, Content: View>: View {
  let inset: Bool
  let content: Content
  let label: Label

  @State private var open = false
  @Environment(\.menuPresentation) private var presentation
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  public init(inset: Bool = false, @ViewBuilder content: () -> Content, @ViewBuilder label: () -> Label) {
    self.inset = inset
    self.content = content()
    self.label = label()
  }

  public var body: some View {
    if presentation == .system {
      Menu { content } label: { label }
    } else {
      VStack(alignment: .leading, spacing: 0) {
        Button {
          withAnimation(reduceMotion ? nil : .easeInOut(duration: 0.2)) { open.toggle() }
        } label: {
          HStack(spacing: 8) {
            label
            Spacer(minLength: 16)
            Ph.caretRight.regular
              .frame(width: 16, height: 16)
              .rotationEffect(.degrees(open ? 90 : 0))
          }
        }
        .buttonStyle(MenuRowStyle(inset: inset, selected: open))
        .accessibilityValue(Text(open ? "Expanded" : "Collapsed"))
        if open {
          VStack(alignment: .leading, spacing: 0) { content }
            .padding(.leading, 12)
            .transition(.opacity)
        }
      }
    }
  }
}

extension DropdownMenuSub where Label == Text {
  public init(_ title: LocalizedStringKey, inset: Bool = false, @ViewBuilder content: () -> Content) {
    self.init(inset: inset, content: content) { Text(title) }
  }
}

extension DropdownMenuSub where Label == SwiftUI.Label<Text, Image> {
  public init(_ title: LocalizedStringKey, icon: Image, @ViewBuilder content: () -> Content) {
    self.init(content: content) {
      SwiftUI.Label { Text(title) } icon: { icon }
    }
  }
}
```

```swift title="swift/Components/Field.swift"
import SwiftUI

extension EnvironmentValues {
  @Entry public var isInvalid = false
  @Entry var fieldInset = false
  @Entry var fieldGroupInset = false
  @Entry var fieldSetInset = false
}

extension View {
  public func invalid(_ isInvalid: Bool = true) -> some View {
    environment(\.isInvalid, isInvalid)
  }
}

public enum FieldOrientation: CaseIterable, Sendable {
  case vertical, horizontal
}

public struct Field<Content: View>: View {
  let orientation: FieldOrientation
  let invalid: Bool?
  let content: Content

  @Environment(\.fieldGroupInset) private var inset
  @Environment(\.isInvalid) private var inheritedInvalid

  public init(
    orientation: FieldOrientation = .vertical,
    invalid: Bool? = nil,
    @ViewBuilder content: () -> Content
  ) {
    self.orientation = orientation
    self.invalid = invalid
    self.content = content()
  }

  public var body: some View {
    Group {
      switch orientation {
      case .vertical:
        VStack(alignment: .leading, spacing: 12) { content }
      case .horizontal:
        HStack(alignment: .center, spacing: 12) { content }
      }
    }
    .frame(maxWidth: .infinity, alignment: .leading)
    .padding(.horizontal, inset ? 16 : 0)
    .padding(.vertical, inset ? 6 : 0)
    .frame(minHeight: inset ? 44 : nil)
    .overlay(alignment: .top) {
      if inset {
        Color.separator
          .frame(height: 1)
          .padding(.leading, 16)
          .offset(y: -1)
      }
    }
    .environment(\.fieldInset, inset)
    .environment(\.fieldGroupInset, false)
    .environment(\.isInvalid, invalid ?? inheritedInvalid)
  }
}

public struct FieldContent<Content: View>: View {
  let content: Content

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    VStack(alignment: .leading, spacing: 4) {
      content
    }
    .frame(maxWidth: .infinity, alignment: .leading)
  }
}

public struct FieldTitle: View {
  let text: Text

  @Environment(\.isEnabled) private var isEnabled

  public init(_ title: LocalizedStringKey) {
    text = Text(title)
  }

  public init<S: StringProtocol>(_ title: S) {
    text = Text(title)
  }

  public var body: some View {
    text
      .scaledTextStyle(.base, weight: .semibold)
      .foregroundStyle(isEnabled ? Color.label : .labelQuaternary)
  }
}

public struct FieldDescription: View {
  let text: Text

  @Environment(\.fieldSetInset) private var inset

  public init(_ description: LocalizedStringKey) {
    text = Text(description)
  }

  public init<S: StringProtocol>(_ description: S) {
    text = Text(description)
  }

  public var body: some View {
    text
      .scaledTextStyle(inset ? .xs : .sm)
      .foregroundStyle(Color.labelSecondary)
      .multilineTextAlignment(.leading)
      .fixedSize(horizontal: false, vertical: true)
      .padding(.leading, inset ? 16 : 0)
  }
}

public struct FieldError: View {
  let messages: [String]
  let text: Text?

  public init(_ message: LocalizedStringKey) {
    messages = []
    text = Text(message)
  }

  public init(errors: [String?]) {
    var seen = Set<String>()
    messages = errors.compactMap { $0 }.filter { !$0.isEmpty && seen.insert($0).inserted }
    text = nil
  }

  public var body: some View {
    if let content {
      content
        .scaledTextStyle(.sm)
        .foregroundStyle(Color.danger)
        .multilineTextAlignment(.leading)
        .fixedSize(horizontal: false, vertical: true)
    }
  }

  private var content: Text? {
    if let text { return text }
    switch messages.count {
    case 0: return nil
    case 1: return Text(verbatim: messages[0])
    default: return Text(verbatim: messages.map { "\u{2022} \($0)" }.joined(separator: "\n"))
    }
  }
}

public enum FieldGroupVariant: CaseIterable, Sendable {
  case `default`, inset
}

public struct FieldGroup<Content: View>: View {
  let variant: FieldGroupVariant
  let content: Content

  public init(_ variant: FieldGroupVariant = .default, @ViewBuilder content: () -> Content) {
    self.variant = variant
    self.content = content()
  }

  public var body: some View {
    styled
      .environment(\.fieldGroupInset, variant == .inset)
      .environment(\.fieldSetInset, false)
      .transformPreference(FieldSetInsetKey.self) { $0 = variant == .inset }
  }

  @ViewBuilder private var styled: some View {
    let stack = VStack(alignment: .leading, spacing: variant == .inset ? 0 : 28) {
      content
    }
    .frame(maxWidth: .infinity, alignment: .leading)
    if variant == .inset {
      let shape = RoundedRectangle(cornerRadius: Radius.xl2, style: .continuous)
      stack
        .background(Color.surfaceSecondary, in: shape)
        .clipShape(shape)
    } else {
      stack
    }
  }
}

struct FieldSetInsetKey: PreferenceKey {
  static let defaultValue = false

  static func reduce(value: inout Bool, nextValue: () -> Bool) {
    value = value || nextValue()
  }
}

public struct FieldSet<Content: View>: View {
  let content: Content

  @State private var inset = false

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    VStack(alignment: .leading, spacing: inset ? 8 : 24) {
      content
    }
    .frame(maxWidth: .infinity, alignment: .leading)
    .environment(\.fieldSetInset, inset)
    .onPreferenceChange(FieldSetInsetKey.self) { inset = $0 }
    .transformPreference(FieldSetInsetKey.self) { $0 = false }
    .accessibilityElement(children: .contain)
  }
}

public struct FieldLegend: View {
  public enum Variant: CaseIterable, Sendable {
    case legend, label
  }

  let text: Text
  let variant: Variant

  @Environment(\.fieldSetInset) private var inset
  @Environment(\.isEnabled) private var isEnabled

  public init(_ title: LocalizedStringKey, variant: Variant = .legend) {
    text = Text(title)
    self.variant = variant
  }

  public init<S: StringProtocol>(_ title: S, variant: Variant = .legend) {
    text = Text(title)
    self.variant = variant
  }

  public var body: some View {
    Group {
      if inset {
        text
          .textCase(.uppercase)
          .scaledTextStyle(.xs)
          .foregroundStyle(isEnabled ? Color.labelSecondary : .labelQuaternary)
          .padding(.leading, 16)
      } else {
        text
          .scaledTextStyle(.base, weight: .semibold)
          .foregroundStyle(isEnabled ? Color.label : .labelQuaternary)
          .padding(.bottom, 12)
      }
    }
    .accessibilityAddTraits(variant == .legend ? .isHeader : [])
  }
}

public struct FieldSeparator<Content: View>: View {
  let content: Content

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    ZStack {
      Separator()
      content
        .scaledTextStyle(.sm)
        .foregroundStyle(Color.labelSecondary)
        .padding(.horizontal, 8)
        .background(Color.surface)
    }
    .frame(minHeight: 20)
    .padding(.vertical, -8)
  }
}

extension FieldSeparator where Content == EmptyView {
  public init() {
    self.init { EmptyView() }
  }
}

extension FieldSeparator where Content == Text {
  public init(_ title: LocalizedStringKey) {
    self.init { Text(title) }
  }
}
```

```swift title="swift/Components/Haptics.swift"
import SwiftUI

extension EnvironmentValues {
  @Entry public var hapticsEnabled = true
}

extension View {
  public func haptics(_ enabled: Bool) -> some View {
    environment(\.hapticsEnabled, enabled)
  }

  func hapticFeedback<Trigger: Equatable>(_ feedback: SensoryFeedback, trigger: Trigger) -> some View {
    modifier(HapticFeedbackModifier(feedback: feedback, trigger: trigger) { _, _ in true })
  }

  func hapticFeedback<Trigger: Equatable>(
    _ feedback: SensoryFeedback,
    trigger: Trigger,
    condition: @escaping (Trigger, Trigger) -> Bool
  ) -> some View {
    modifier(HapticFeedbackModifier(feedback: feedback, trigger: trigger, condition: condition))
  }
}

private struct HapticFeedbackModifier<Trigger: Equatable>: ViewModifier {
  let feedback: SensoryFeedback
  let trigger: Trigger
  let condition: (Trigger, Trigger) -> Bool

  @Environment(\.hapticsEnabled) private var enabled

  func body(content: Content) -> some View {
    let enabled = enabled
    let condition = condition
    content.sensoryFeedback(feedback, trigger: trigger) { old, new in
      enabled && condition(old, new)
    }
  }
}

enum HapticMoments {
  static func step(_ value: Double, bounds: ClosedRange<Double>, step: Double?) -> Int? {
    guard let step, step > 0 else { return nil }
    return Int(((value - bounds.lowerBound) / step).rounded())
  }

  static func lifted<Value: Equatable>(_ old: Value?, _ new: Value?) -> Bool {
    new != nil && old != new
  }

  static func crossed<Value: Equatable>(_ old: Value?, _ new: Value?) -> Bool {
    old == nil && new != nil
  }

  static func moved(_ old: Int?, _ new: Int?) -> Bool {
    guard let old, let new else { return false }
    return old != new
  }
}

struct HapticButton<Style: ButtonStyle>: View {
  let feedback: SensoryFeedback
  let action: () -> Bool
  let style: Style

  @State private var count = 0

  init(_ feedback: SensoryFeedback = .selection, style: Style, action: @escaping () -> Bool) {
    self.feedback = feedback
    self.style = style
    self.action = action
  }

  var body: some View {
    Button {
      if action() { count += 1 }
    } label: {
      EmptyView()
    }
    .buttonStyle(style)
    .hapticFeedback(feedback, trigger: count)
  }
}
```

```swift title="swift/Components/Item.swift"
import SwiftUI

public enum ItemVariant: CaseIterable, Sendable {
  case `default`, outline, muted
}

public enum ItemSize: CaseIterable, Sendable {
  case `default`, sm, xs

  var horizontalPadding: CGFloat {
    switch self {
    case .default: 16
    case .sm: 14
    case .xs: 12
    }
  }

  var verticalPadding: CGFloat {
    switch self {
    case .default: 14
    case .sm: 12
    case .xs: 10
    }
  }

  var gap: CGFloat {
    self == .xs ? 10 : 14
  }

  var groupGap: CGFloat {
    switch self {
    case .default: 16
    case .sm: 10
    case .xs: 8
    }
  }

  var mediaImage: CGFloat {
    switch self {
    case .default: 40
    case .sm: 32
    case .xs: 24
    }
  }
}

public enum ItemGroupVariant: CaseIterable, Sendable {
  case `default`, inset
}

extension EnvironmentValues {
  @Entry var itemSize: ItemSize = .default
  @Entry var itemGroupInset = false
  @Entry var itemHasDescription = false
}

struct ItemGapKey: PreferenceKey {
  static var defaultValue: CGFloat? { nil }

  static func reduce(value: inout CGFloat?, nextValue: () -> CGFloat?) {
    guard let next = nextValue() else { return }
    value = min(value ?? next, next)
  }
}

struct ItemDescriptionKey: PreferenceKey {
  static var defaultValue: Bool { false }

  static func reduce(value: inout Bool, nextValue: () -> Bool) {
    value = value || nextValue()
  }
}

enum ItemSlot: Sendable {
  case media, content, actions, fullRow, other
}

struct ItemSlotKey: LayoutValueKey {
  static let defaultValue = ItemSlot.other
}

public struct ItemGroup<Content: View>: View {
  let variant: ItemGroupVariant
  let content: Content

  @State private var gap: CGFloat?

  public init(_ variant: ItemGroupVariant = .default, @ViewBuilder content: () -> Content) {
    self.variant = variant
    self.content = content()
  }

  public var body: some View {
    let inset = variant == .inset
    let shape = RoundedRectangle(cornerRadius: Radius.xl2, style: .continuous)
    VStack(alignment: .leading, spacing: inset ? 0 : gap ?? ItemSize.default.groupGap) {
      content
    }
    .frame(maxWidth: .infinity, alignment: .leading)
    .environment(\.itemGroupInset, inset)
    .onPreferenceChange(ItemGapKey.self) { gap = $0 }
    .transformPreference(ItemGapKey.self) { $0 = nil }
    .background(inset ? Color.surfaceSecondary : .clear, in: shape)
    .clipShape(inset ? AnyShape(shape) : AnyShape(Rectangle()))
    .accessibilityElement(children: .contain)
  }
}

public struct ItemSeparator: View {
  @Environment(\.itemGroupInset) private var inset

  public init() {}

  public var body: some View {
    Separator()
      .padding(.vertical, inset ? 0 : 8)
      .padding(.leading, inset ? 16 : 0)
  }
}

public struct Item<Content: View>: View {
  let variant: ItemVariant
  let size: ItemSize
  let action: (() -> Void)?
  let content: Content

  @State private var hasDescription = false
  @Environment(\.itemGroupInset) private var inset

  public init(
    _ variant: ItemVariant = .default,
    size: ItemSize = .default,
    action: (() -> Void)? = nil,
    @ViewBuilder content: () -> Content
  ) {
    self.variant = variant
    self.size = size
    self.action = action
    self.content = content()
  }

  public var body: some View {
    Group {
      if let action {
        Button(action: action) {
          surface
        }
        .buttonStyle(ItemButtonStyle(variant: variant, inset: inset))
      } else {
        surface.background(ItemBackground(variant: variant, inset: inset, pressed: false))
      }
    }
    .preference(key: ItemGapKey.self, value: size.groupGap)
  }

  private var surface: some View {
    ItemLayout(gap: size.gap, topAlignMedia: hasDescription) {
      content
    }
    .scaledFont(.base)
    .foregroundStyle(Color.label)
    .padding(.horizontal, size.horizontalPadding)
    .padding(.vertical, size.verticalPadding)
    .frame(maxWidth: .infinity, alignment: .leading)
    .environment(\.itemSize, size)
    .environment(\.itemHasDescription, hasDescription)
    .onPreferenceChange(ItemDescriptionKey.self) { hasDescription = $0 }
    .contentShape(Rectangle())
  }
}

private struct ItemBackground: View {
  let variant: ItemVariant
  let inset: Bool
  let pressed: Bool

  var body: some View {
    let shape = RoundedRectangle(cornerRadius: inset ? 0 : Radius.xl, style: .continuous)
    ZStack {
      shape.fill(variant == .muted ? Color.surfaceSecondary.opacity(0.5) : .clear)
      if pressed {
        shape.fill(Color.itemPressed)
      }
      if variant == .outline {
        shape.strokeBorder(Color.separator)
      }
    }
  }
}

private struct ItemButtonStyle: ButtonStyle {
  let variant: ItemVariant
  let inset: Bool

  @Environment(\.isEnabled) private var isEnabled

  func makeBody(configuration: Configuration) -> some View {
    configuration.label
      .background(ItemBackground(variant: variant, inset: inset, pressed: configuration.isPressed && isEnabled))
      .opacity(isEnabled ? 1 : 0.5)
  }
}

struct ItemLayout: Layout {
  var gap: CGFloat
  var topAlignMedia: Bool

  private struct Line {
    var indices: [Int]
    var full: Bool
  }

  private func lines(_ subviews: Subviews) -> [Line] {
    var result: [Line] = []
    var current: [Int] = []
    for index in subviews.indices {
      if subviews[index][ItemSlotKey.self] == .fullRow {
        if !current.isEmpty { result.append(Line(indices: current, full: false)) }
        current = []
        result.append(Line(indices: [index], full: true))
      } else {
        current.append(index)
      }
    }
    if !current.isEmpty { result.append(Line(indices: current, full: false)) }
    return result
  }

  private func widths(_ line: Line, subviews: Subviews, width: CGFloat?) -> [CGFloat] {
    if line.full {
      return [width ?? subviews[line.indices[0]].sizeThatFits(.unspecified).width]
    }
    let spacing = gap * CGFloat(max(line.indices.count - 1, 0))
    let flexible = line.indices.first { subviews[$0][ItemSlotKey.self] == .content }
    var fixed: [Int: CGFloat] = [:]
    for index in line.indices where index != flexible {
      fixed[index] = subviews[index].sizeThatFits(.unspecified).width
    }
    let used = fixed.values.reduce(0, +) + spacing
    return line.indices.map { index in
      if index == flexible {
        if let width { return max(width - used, 0) }
        return subviews[index].sizeThatFits(.unspecified).width
      }
      return fixed[index] ?? 0
    }
  }

  func sizeThatFits(proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) -> CGSize {
    var height: CGFloat = 0
    var widest: CGFloat = 0
    let all = lines(subviews)
    for (position, line) in all.enumerated() {
      let sizes = widths(line, subviews: subviews, width: proposal.width)
      var lineHeight: CGFloat = 0
      for (index, width) in zip(line.indices, sizes) {
        lineHeight = max(lineHeight, subviews[index].sizeThatFits(ProposedViewSize(width: width, height: nil)).height)
      }
      let spacing = gap * CGFloat(max(line.indices.count - 1, 0))
      widest = max(widest, sizes.reduce(0, +) + (line.full ? 0 : spacing))
      height += lineHeight + (position > 0 ? gap : 0)
    }
    return CGSize(width: proposal.width ?? widest, height: height)
  }

  func placeSubviews(in bounds: CGRect, proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) {
    var y = bounds.minY
    for line in lines(subviews) {
      let sizes = widths(line, subviews: subviews, width: bounds.width)
      var heights: [CGFloat] = []
      for (index, width) in zip(line.indices, sizes) {
        heights.append(subviews[index].sizeThatFits(ProposedViewSize(width: width, height: nil)).height)
      }
      let lineHeight = heights.max() ?? 0
      var x = bounds.minX
      for (offset, index) in line.indices.enumerated() {
        let width = sizes[offset]
        let height = heights[offset]
        let top = topAlignMedia && subviews[index][ItemSlotKey.self] == .media
        let originY = top ? y + 2 : y + (lineHeight - height) / 2
        subviews[index].place(
          at: CGPoint(x: x, y: originY),
          anchor: .topLeading,
          proposal: ProposedViewSize(width: width, height: height)
        )
        x += width + gap
      }
      y += lineHeight + gap
    }
  }
}

public enum ItemMediaVariant: CaseIterable, Sendable {
  case `default`, icon, image
}

public struct ItemMedia<Content: View>: View {
  let variant: ItemMediaVariant
  let content: Content

  @Environment(\.itemSize) private var size

  public init(_ variant: ItemMediaVariant = .default, @ViewBuilder content: () -> Content) {
    self.variant = variant
    self.content = content()
  }

  public var body: some View {
    Group {
      switch variant {
      case .default:
        HStack(spacing: 8) { content }
      case .icon:
        content.frame(width: 16, height: 16)
      case .image:
        content
          .scaledToFill()
          .frame(width: size.mediaImage, height: size.mediaImage)
          .clipShape(RoundedRectangle(cornerRadius: size == .xs ? Radius.sm : Radius.md, style: .continuous))
      }
    }
    .accessibilityHidden(variant != .default)
    .layoutValue(key: ItemSlotKey.self, value: .media)
  }
}

public struct ItemContent<Content: View>: View {
  let content: Content

  @Environment(\.itemSize) private var size

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    VStack(alignment: .leading, spacing: size == .xs ? 2 : 4) {
      content
    }
    .frame(maxWidth: .infinity, alignment: .leading)
    .layoutValue(key: ItemSlotKey.self, value: .content)
  }
}

public struct ItemTitle<Content: View>: View {
  let content: Content

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    HStack(spacing: 8) {
      content
    }
    .scaledTextStyle(.base, weight: .semibold)
    .foregroundStyle(Color.label)
    .lineLimit(1)
    .accessibilityElement(children: .combine)
  }
}

extension ItemTitle where Content == Text {
  public init(_ title: LocalizedStringKey) {
    self.init { Text(title) }
  }

  public init(verbatim title: String) {
    self.init { Text(verbatim: title) }
  }
}

public struct ItemDescription: View {
  let text: Text

  public init(_ description: LocalizedStringKey) {
    text = Text(description)
  }

  public init(verbatim description: String) {
    text = Text(verbatim: description)
  }

  public var body: some View {
    text
      .scaledTextStyle(.sm)
      .foregroundStyle(Color.labelSecondary)
      .multilineTextAlignment(.leading)
      .lineLimit(2)
      .fixedSize(horizontal: false, vertical: true)
      .preference(key: ItemDescriptionKey.self, value: true)
  }
}

public struct ItemActions<Content: View>: View {
  let content: Content

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    HStack(spacing: 8) {
      content
    }
    .fixedSize()
    .layoutValue(key: ItemSlotKey.self, value: .actions)
  }
}

public struct ItemHeader<Content: View>: View {
  let content: Content

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    SpaceBetween(spacing: 8) {
      content
    }
    .frame(maxWidth: .infinity)
    .layoutValue(key: ItemSlotKey.self, value: .fullRow)
  }
}

public struct ItemFooter<Content: View>: View {
  let content: Content

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    SpaceBetween(spacing: 8) {
      content
    }
    .frame(maxWidth: .infinity)
    .layoutValue(key: ItemSlotKey.self, value: .fullRow)
  }
}

struct SpaceBetween: Layout {
  var spacing: CGFloat

  func sizeThatFits(proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) -> CGSize {
    let sizes = subviews.map { $0.sizeThatFits(.unspecified) }
    let natural = sizes.reduce(0) { $0 + $1.width } + spacing * CGFloat(max(subviews.count - 1, 0))
    return CGSize(width: proposal.width ?? natural, height: sizes.map(\.height).max() ?? 0)
  }

  func placeSubviews(in bounds: CGRect, proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) {
    let sizes = subviews.map { $0.sizeThatFits(.unspecified) }
    let total = sizes.reduce(0) { $0 + $1.width }
    let gaps = CGFloat(max(subviews.count - 1, 0))
    let gap = subviews.count > 1 ? max(spacing, (bounds.width - total) / gaps) : 0
    var x = bounds.minX
    for (index, view) in subviews.enumerated() {
      let size = sizes[index]
      view.place(
        at: CGPoint(x: x, y: bounds.midY - size.height / 2),
        anchor: .topLeading,
        proposal: ProposedViewSize(size)
      )
      x += size.width + gap
    }
  }
}
```

```swift title="swift/Components/KeyboardScrollView.swift"
import SwiftUI
import UIKit

public struct KeyboardScrollView<Content: View>: View {
  let showsIndicators: Bool
  let content: Content

  public init(showsIndicators: Bool = true, @ViewBuilder content: () -> Content) {
    self.showsIndicators = showsIndicators
    self.content = content()
  }

  public var body: some View {
    ScrollView(.vertical, showsIndicators: showsIndicators) {
      content
        .frame(maxWidth: .infinity, alignment: .topLeading)
        .background {
          Color.clear
            .contentShape(Rectangle())
            .onTapGesture { KeyboardScrollView.dismissKeyboard() }
        }
    }
    .scrollDismissesKeyboard(.interactively)
  }

  @MainActor
  static func dismissKeyboard() {
    UIApplication.shared.sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: nil, for: nil)
  }
}
```

```swift title="swift/Components/Overlay.swift"
import PhosphorSwift
import Observation
import SwiftUI

public enum PopupAlignment: Sendable, CaseIterable {
  case start, center, end
}

struct OverlayDismiss: Sendable {
  let action: @MainActor @Sendable () -> Void

  @MainActor func callAsFunction() {
    action()
  }
}

extension EnvironmentValues {
  @Entry var overlayDismiss: OverlayDismiss? = nil
}

private var instantTransaction: Transaction {
  var transaction = Transaction()
  transaction.disablesAnimations = true
  return transaction
}

struct CoverPresenter<Cover: View>: ViewModifier {
  @Binding var isPresented: Bool
  var enter: Animation = .easeOut(duration: 0.15)
  var exit: Animation = .easeIn(duration: 0.1)
  @ViewBuilder let cover: (Bool) -> Cover

  @State private var presented = false
  @State private var visible = false

  func body(content: Content) -> some View {
    let binding = $isPresented
    content
      .fullScreenCover(isPresented: coverBinding) {
        cover(visible)
          .environment(\.overlayDismiss, OverlayDismiss { binding.wrappedValue = false })
          .presentationBackground(.clear)
          .onAppear {
            withAnimation(enter) { visible = true }
          }
      }
      .onChange(of: isPresented, initial: true) { _, value in
        if value {
          withTransaction(instantTransaction) { presented = true }
        } else if presented {
          withAnimation(exit) {
            visible = false
          } completion: {
            withTransaction(instantTransaction) { presented = false }
          }
        }
      }
  }

  private var coverBinding: Binding<Bool> {
    Binding(
      get: { presented },
      set: { value in
        presented = value
        if !value {
          visible = false
          isPresented = false
        }
      }
    )
  }
}

struct PopupLayout: Layout {
  var anchor: CGRect
  var side: Edge
  var align: PopupAlignment
  var sideOffset: CGFloat
  var alignOffset: CGFloat
  var matchWidth: Bool
  var minWidth: CGFloat
  var maxHeight: CGFloat
  var margin: CGFloat = 8

  func sizeThatFits(proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) -> CGSize {
    proposal.replacingUnspecifiedDimensions()
  }

  func placeSubviews(in bounds: CGRect, proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) {
    guard let view = subviews.first else { return }
    let anchor = anchor.offsetBy(dx: bounds.minX, dy: bounds.minY)
    let maxWidth = max(0, bounds.width - margin * 2)
    var width: CGFloat
    if matchWidth {
      width = max(anchor.width, minWidth)
    } else {
      width = max(view.sizeThatFits(ProposedViewSize(width: nil, height: nil)).width, minWidth)
    }
    width = min(width, maxWidth)
    let natural = view.sizeThatFits(ProposedViewSize(width: width, height: nil))
    let vertical = side == .top || side == .bottom
    let before = vertical
      ? anchor.minY - sideOffset - bounds.minY - margin
      : anchor.minX - sideOffset - bounds.minX - margin
    let after = vertical
      ? bounds.maxY - margin - anchor.maxY - sideOffset
      : bounds.maxX - margin - anchor.maxX - sideOffset
    let extent = vertical ? natural.height : natural.width
    var resolved = side
    switch side {
    case .bottom where extent > after && before > after: resolved = .top
    case .top where extent > before && after > before: resolved = .bottom
    case .trailing where extent > after && before > after: resolved = .leading
    case .leading where extent > before && after > before: resolved = .trailing
    default: break
    }
    var height = natural.height
    let space: CGFloat
    switch resolved {
    case .top, .leading: space = before
    case .bottom, .trailing: space = after
    }
    if vertical {
      height = min(height, maxHeight, max(space, 0))
    } else {
      height = min(height, maxHeight, bounds.height - margin * 2)
      width = min(width, max(space, 0))
    }
    var x: CGFloat
    var y: CGFloat
    if vertical {
      switch align {
      case .start: x = anchor.minX + alignOffset
      case .center: x = anchor.midX - width / 2 + alignOffset
      case .end: x = anchor.maxX - width - alignOffset
      }
      y = resolved == .bottom ? anchor.maxY + sideOffset : anchor.minY - sideOffset - height
    } else {
      switch align {
      case .start: y = anchor.minY + alignOffset
      case .center: y = anchor.midY - height / 2 + alignOffset
      case .end: y = anchor.maxY - height - alignOffset
      }
      x = resolved == .trailing ? anchor.maxX + sideOffset : anchor.minX - sideOffset - width
    }
    x = min(max(x, bounds.minX + margin), bounds.maxX - margin - width)
    y = min(max(y, bounds.minY + margin), bounds.maxY - margin - height)
    view.place(
      at: CGPoint(x: x, y: y),
      anchor: .topLeading,
      proposal: ProposedViewSize(width: width, height: height)
    )
  }
}

struct PopupPresenter<Popup: View>: ViewModifier {
  @Binding var isPresented: Bool
  var side: Edge = .bottom
  var align: PopupAlignment = .start
  var sideOffset: CGFloat = 4
  var alignOffset: CGFloat = 0
  var matchWidth = false
  var minWidth: CGFloat = 0
  var maxHeight: CGFloat = .infinity
  @ViewBuilder let popup: () -> Popup

  @State private var anchor = PopupAnchor()

  func body(content: Content) -> some View {
    content
      .onGeometryChange(for: CGRect.self) { proxy in
        proxy.frame(in: .global)
      } action: { frame in
        anchor.frame = frame
      }
      .modifier(
        CoverPresenter(isPresented: $isPresented) { visible in
          PopupCanvas(
            anchor: anchor,
            side: side,
            align: align,
            sideOffset: sideOffset,
            alignOffset: alignOffset,
            matchWidth: matchWidth,
            minWidth: minWidth,
            maxHeight: maxHeight,
            visible: visible,
            popup: popup
          )
        }
      )
  }
}

@Observable
final class PopupAnchor {
  var frame: CGRect = .zero
}

struct PopupCanvas<Popup: View>: View {
  let anchor: PopupAnchor
  let side: Edge
  let align: PopupAlignment
  let sideOffset: CGFloat
  let alignOffset: CGFloat
  let matchWidth: Bool
  let minWidth: CGFloat
  let maxHeight: CGFloat
  let visible: Bool
  @ViewBuilder let popup: () -> Popup

  @Environment(\.overlayDismiss) private var dismiss
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  var body: some View {
    GeometryReader { proxy in
      let origin = proxy.frame(in: .global).origin
      PopupLayout(
        anchor: anchor.frame.offsetBy(dx: -origin.x, dy: -origin.y),
        side: side,
        align: align,
        sideOffset: sideOffset,
        alignOffset: alignOffset,
        matchWidth: matchWidth,
        minWidth: minWidth,
        maxHeight: maxHeight
      ) {
        popup()
          .accessibilityAddTraits(.isModal)
          .scaleEffect(visible || reduceMotion ? 1 : 0.96, anchor: scaleAnchor)
          .opacity(visible ? 1 : 0)
      }
    }
    .background {
      Color.clear
        .contentShape(Rectangle())
        .ignoresSafeArea()
        .onTapGesture { dismiss?() }
        .accessibilityHidden(true)
    }
    .accessibilityAction(.escape) { dismiss?() }
  }

  private var scaleAnchor: UnitPoint {
    switch side {
    case .top: .bottom
    case .bottom: .top
    case .leading: .trailing
    case .trailing: .leading
    }
  }
}

extension View {
  func anchoredPopup<Popup: View>(
    isPresented: Binding<Bool>,
    side: Edge = .bottom,
    align: PopupAlignment = .start,
    sideOffset: CGFloat = 4,
    alignOffset: CGFloat = 0,
    matchWidth: Bool = false,
    minWidth: CGFloat = 0,
    maxHeight: CGFloat = .infinity,
    @ViewBuilder popup: @escaping () -> Popup
  ) -> some View {
    modifier(
      PopupPresenter(
        isPresented: isPresented,
        side: side,
        align: align,
        sideOffset: sideOffset,
        alignOffset: alignOffset,
        matchWidth: matchWidth,
        minWidth: minWidth,
        maxHeight: maxHeight,
        popup: popup
      )
    )
  }

  func popupSurface(radius: CGFloat = Radius.xl, shadow: Shadow = .lg) -> some View {
    modifier(PopupSurface(radius: radius, shadow: shadow))
  }
}

struct PopupSurface: ViewModifier {
  let radius: CGFloat
  let shadow: Shadow

  @Environment(\.colorScheme) private var colorScheme

  func body(content: Content) -> some View {
    let shape = RoundedRectangle(cornerRadius: radius, style: .continuous)
    content
      .clipShape(shape)
      .background {
        shape
          .fill(Color.surfaceRaised)
          .shadow(shadow)
      }
      .overlay {
        shape.strokeBorder(Color.label.opacity(colorScheme == .dark ? 0.1 : 0.05))
      }
  }
}

struct OverlayCloseButton: View {
  let label: LocalizedStringKey?

  @Environment(\.overlayDismiss) private var dismiss

  var body: some View {
    if let label {
      Button {
        dismiss?()
      } label: {
        Text(label).font(TextStyle.base.font())
      }
      .buttonStyle(.variant(.plain, size: .sm))
    } else {
      Button {
        dismiss?()
      } label: {
        Ph.x.regular
          .frame(width: 16, height: 16)
          .foregroundStyle(Color.label)
      }
      .buttonStyle(CloseIconButtonStyle())
      .accessibilityLabel(Text("Close"))
    }
  }
}

private struct CloseIconButtonStyle: ButtonStyle {
  func makeBody(configuration: Configuration) -> some View {
    configuration.label
      .frame(width: 32, height: 32)
      .background(configuration.isPressed ? Color.separator : .surfaceTertiary, in: Circle())
      .contentShape(Circle().inset(by: -8))
  }
}

struct ReversedVStack: Layout {
  var spacing: CGFloat

  func sizeThatFits(proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) -> CGSize {
    let width = proposal.width
    var height: CGFloat = 0
    var widest: CGFloat = 0
    for view in subviews {
      let size = view.sizeThatFits(ProposedViewSize(width: width, height: nil))
      height += size.height
      widest = max(widest, size.width)
    }
    height += spacing * CGFloat(max(subviews.count - 1, 0))
    return CGSize(width: width ?? widest, height: height)
  }

  func placeSubviews(in bounds: CGRect, proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) {
    var y = bounds.minY
    for view in subviews.reversed() {
      let size = view.sizeThatFits(ProposedViewSize(width: bounds.width, height: nil))
      view.place(
        at: CGPoint(x: bounds.minX, y: y),
        anchor: .topLeading,
        proposal: ProposedViewSize(width: bounds.width, height: size.height)
      )
      y += size.height + spacing
    }
  }
}

struct ScrimLayer: View {
  let visible: Bool
  var dismissible = true

  @Environment(\.overlayDismiss) private var dismiss

  var body: some View {
    Color.scrim
      .ignoresSafeArea()
      .opacity(visible ? 1 : 0)
      .contentShape(Rectangle())
      .onTapGesture {
        if dismissible { dismiss?() }
      }
      .accessibilityHidden(true)
  }
}
```

```swift title="swift/Components/Screen.swift"
import SwiftUI

extension EnvironmentValues {
  @Entry var screenBackground: Color = .surface
}

public struct Screen<Content: View>: View {
  public enum Background: CaseIterable, Sendable {
    case surface, surfaceSecondary

    var color: Color {
      switch self {
      case .surface: .surface
      case .surfaceSecondary: .surfaceSecondary
      }
    }
  }

  let edges: Edge.Set
  let background: Background
  let content: Content

  public init(
    edges: Edge.Set = .all,
    background: Background = .surface,
    @ViewBuilder content: () -> Content
  ) {
    self.edges = edges
    self.background = background
    self.content = content()
  }

  public var body: some View {
    VStack(spacing: 0) {
      content
    }
    .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .top)
    .ignoresSafeArea(.container, edges: Edge.Set.all.subtracting(edges))
    .foregroundStyle(Color.label)
    .background(background.color.ignoresSafeArea())
    .environment(\.screenBackground, background.color)
  }
}

public struct ScreenContent<Content: View>: View {
  let scroll: Bool
  let padded: Bool
  let content: Content

  public init(scroll: Bool = true, padded: Bool = true, @ViewBuilder content: () -> Content) {
    self.scroll = scroll
    self.padded = padded
    self.content = content()
  }

  public var body: some View {
    if scroll {
      KeyboardScrollView {
        stack
      }
    } else {
      stack
        .frame(maxHeight: .infinity, alignment: .top)
    }
  }

  private var stack: some View {
    VStack(alignment: .leading, spacing: 16) {
      content
    }
    .padding(padded ? 16 : 0)
    .frame(maxWidth: .infinity, alignment: .leading)
  }
}
```

```swift title="swift/Components/Select.swift"
import PhosphorSwift
import SwiftUI

struct SelectContext: @unchecked Sendable {
  var selected: AnyHashable?
  var registering = false
  var select: @MainActor @Sendable (AnyHashable) -> Void = { _ in }
}

extension EnvironmentValues {
  @Entry var select = SelectContext()
}

struct SelectLabelsKey: PreferenceKey {
  static var defaultValue: [AnyHashable: Text] { [:] }

  static func reduce(value: inout [AnyHashable: Text], nextValue: () -> [AnyHashable: Text]) {
    value.merge(nextValue()) { current, _ in current }
  }
}

public enum SelectSize: CaseIterable, Sendable {
  case `default`, sm
}

public struct SelectField<Value: Hashable & Sendable, Content: View>: View {
  public typealias Size = SelectSize

  let selection: Binding<Value?>
  let placeholder: LocalizedStringKey
  let size: Size
  let content: () -> Content

  @State private var open = false
  @State private var labels: [AnyHashable: Text] = [:]
  @Environment(\.isEnabled) private var isEnabled
  @Environment(\.isInvalid) private var invalid
  @Environment(\.colorScheme) private var colorScheme

  public init(
    selection: Binding<Value?>,
    placeholder: LocalizedStringKey = "Select",
    size: Size = .default,
    @ViewBuilder content: @escaping () -> Content
  ) {
    self.selection = selection
    self.placeholder = placeholder
    self.size = size
    self.content = content
  }

  public var body: some View {
    let binding = selection
    let current = binding.wrappedValue.map { AnyHashable($0) }
    let valueText = current.flatMap { labels[$0] }
    let context = SelectContext(
      selected: current,
      select: { value in
        if let value = value.base as? Value { binding.wrappedValue = value }
      }
    )
    ButtonGroupItem(radius: size == .sm ? Radius.md : Radius.lg) { shape in
      Button {
        open = true
      } label: {
        HStack(spacing: 6) {
          (valueText ?? Text(placeholder))
            .font(TextStyle.base.font())
            .tracking(TextStyle.base.letterSpacing)
            .lineLimit(1)
            .foregroundStyle(!isEnabled ? Color.labelQuaternary : valueText == nil ? .labelSecondary : .label)
            .frame(maxWidth: .infinity, alignment: .leading)
          Ph.caretUpDown.regular
            .frame(width: 16, height: 16)
            .foregroundStyle(Color.labelSecondary)
            .accessibilityHidden(true)
        }
        .padding(.horizontal, 12)
        .frame(height: size == .sm ? 36 : 44)
        .background(background, in: shape)
        .overlay {
          if invalid {
            shape.strokeBorder(Color.danger)
          }
        }
        .contentShape(shape)
      }
      .buttonStyle(SelectTriggerStyle())
    }
    .accessibilityHint(Text("Shows options"))
    .background {
      VStack(spacing: 0) { content() }
        .environment(\.select, SelectContext(registering: true))
        .hidden()
        .frame(width: 0, height: 0)
        .clipped()
        .accessibilityHidden(true)
        .allowsHitTesting(false)
    }
    .onPreferenceChange(SelectLabelsKey.self) { value in
      labels = value
    }
    .anchoredPopup(
      isPresented: $open,
      side: .bottom,
      align: .center,
      matchWidth: true,
      minWidth: 144
    ) {
      SelectPanel(content: content)
        .environment(\.select, context)
    }
  }

  private var background: Color {
    if !isEnabled { return .controlDisabled }
    if invalid { return .danger.opacity(colorScheme == .dark ? 0.1 : 0.05) }
    return .control
  }
}

private struct SelectTriggerStyle: ButtonStyle {
  func makeBody(configuration: Configuration) -> some View {
    configuration.label.opacity(configuration.isPressed ? 0.8 : 1)
  }
}

struct SelectPanel<Content: View>: View {
  @ViewBuilder let content: () -> Content

  var body: some View {
    let stack = VStack(alignment: .leading, spacing: 0) {
      content()
    }
    .padding(6)
    ViewThatFits(in: .vertical) {
      stack
      ScrollView { stack }
    }
    .font(TextStyle.base.font())
    .tracking(TextStyle.base.letterSpacing)
    .foregroundStyle(Color.label)
    .popupSurface(radius: Radius.xl)
    .accessibilityElement(children: .contain)
  }
}

public struct SelectItem: View {
  let value: AnyHashable
  let title: Text

  @Environment(\.select) private var select
  @Environment(\.overlayDismiss) private var dismiss

  public init<Value: Hashable & Sendable>(_ title: LocalizedStringKey, value: Value) {
    self.value = AnyHashable(value)
    self.title = Text(title)
  }

  public init<Value: Hashable & Sendable>(verbatim title: String, value: Value) {
    self.value = AnyHashable(value)
    self.title = Text(verbatim: title)
  }

  public var body: some View {
    if select.registering {
      Color.clear
        .frame(width: 0, height: 0)
        .preference(key: SelectLabelsKey.self, value: [value: title])
    } else {
      let selected = select.selected == value
      Button {
        select.select(value)
        dismiss?()
      } label: {
        title
      }
      .buttonStyle(MenuRowStyle(trailing: 32))
      .overlay(alignment: .trailing) {
        if selected {
          Ph.check.regular
            .frame(width: 16, height: 16)
            .foregroundStyle(Color.link)
            .padding(.trailing, 8)
            .accessibilityHidden(true)
        }
      }
      .accessibilityAddTraits(selected ? .isSelected : [])
    }
  }
}

public struct SelectGroup<Content: View>: View {
  let content: Content

  @Environment(\.select) private var select

  public init(@ViewBuilder content: () -> Content) {
    self.content = content()
  }

  public var body: some View {
    VStack(alignment: .leading, spacing: 0) { content }
  }
}

public struct SelectLabel: View {
  let title: LocalizedStringKey

  @Environment(\.select) private var select

  public init(_ title: LocalizedStringKey) {
    self.title = title
  }

  public var body: some View {
    if !select.registering {
      Text(title)
        .font(TextStyle.xs.font(weight: .semibold))
        .tracking(TextStyle.xs.letterSpacing)
        .foregroundStyle(Color.labelSecondary)
        .padding(.horizontal, 12)
        .padding(.vertical, 10)
        .frame(maxWidth: .infinity, alignment: .leading)
        .accessibilityAddTraits(.isHeader)
    }
  }
}

public struct SelectSeparator: View {
  @Environment(\.select) private var select

  public init() {}

  public var body: some View {
    if !select.registering {
      Rectangle()
        .fill(Color.separator)
        .frame(height: 1)
        .padding(.vertical, 6)
        .padding(.horizontal, -6)
        .accessibilityHidden(true)
    }
  }
}
```

```swift title="swift/Components/Separator.swift"
import SwiftUI

public struct Separator: View {
  let orientation: Axis

  public init(_ orientation: Axis = .horizontal) {
    self.orientation = orientation
  }

  public var body: some View {
    Rectangle()
      .fill(Color.separator)
      .frame(width: orientation == .vertical ? 1 : nil, height: orientation == .horizontal ? 1 : nil)
      .frame(maxWidth: orientation == .horizontal ? .infinity : nil, maxHeight: orientation == .vertical ? .infinity : nil)
      .accessibilityHidden(true)
  }
}
```

```swift title="swift/Components/Switch.swift"
import SwiftUI

public struct SwitchStyle: ToggleStyle {
  public enum Size: CaseIterable, Sendable {
    case `default`, sm

    var track: CGSize {
      switch self {
      case .default: CGSize(width: 52, height: 24)
      case .sm: CGSize(width: 44, height: 20)
      }
    }

    var thumbHeight: CGFloat {
      switch self {
      case .default: 20
      case .sm: 16
      }
    }

    func thumbWidth(pressed: Bool) -> CGFloat {
      switch self {
      case .default: pressed ? 36 : 32
      case .sm: pressed ? 30 : 26
      }
    }

    func travel(pressed: Bool) -> CGFloat {
      switch self {
      case .default: pressed ? 12 : 16
      case .sm: pressed ? 10 : 14
      }
    }
  }

  let size: Size

  public init(size: Size = .default) {
    self.size = size
  }

  public func makeBody(configuration: Configuration) -> some View {
    HapticButton(style: PressReader { pressed in
      HStack(spacing: 12) {
        SwitchTrack(isOn: configuration.isOn, pressed: pressed, size: size)
        SwitchLabel(label: configuration.label)
      }
      .contentShape(Rectangle().inset(by: -8))
    }) {
      configuration.isOn.toggle()
      return true
    }
    .accessibilityElement(children: .combine)
    .accessibilityRemoveTraits(.isButton)
    .accessibilityAddTraits(.isToggle)
    .accessibilityValue(configuration.isOn ? Text("On") : Text("Off"))
  }
}

private struct SwitchLabel<Label: View>: View {
  let label: Label

  var body: some View {
    if #available(iOS 18, *) {
      SwitchLabelVisibility(label: label)
    } else {
      label
    }
  }
}

@available(iOS 18, *)
private struct SwitchLabelVisibility<Label: View>: View {
  let label: Label

  @Environment(\.labelsVisibility) private var visibility

  var body: some View {
    if visibility != .hidden {
      label
    }
  }
}

private struct SwitchTrack: View {
  let isOn: Bool
  let pressed: Bool
  let size: SwitchStyle.Size

  @Environment(\.isEnabled) private var isEnabled
  @Environment(\.isInvalid) private var invalid
  @Environment(\.colorScheme) private var colorScheme
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  var body: some View {
    let squeezed = pressed && isEnabled
    ZStack(alignment: .leading) {
      Capsule().fill(fill)
      Capsule().strokeBorder(border, lineWidth: 2)
      Capsule()
        .fill(colorScheme == .dark ? Color.label : .surface)
        .frame(width: size.thumbWidth(pressed: squeezed), height: size.thumbHeight)
        .shadow(.thumb)
        .offset(x: 2 + (isOn ? size.travel(pressed: squeezed) : 0))
    }
    .frame(width: size.track.width, height: size.track.height)
    .animation(reduceMotion ? nil : .timingCurve(0.32, 0.72, 0, 1, duration: 0.2), value: isOn)
    .animation(reduceMotion ? nil : .timingCurve(0.32, 0.72, 0, 1, duration: 0.2), value: squeezed)
  }

  private var fill: Color {
    if isOn { return isEnabled ? .accent : .accentDisabled }
    return isEnabled ? .labelQuaternary : .controlDisabled
  }

  private var border: Color {
    if invalid && isEnabled { return .danger }
    return isOn && isEnabled ? .accent : .clear
  }
}

extension ToggleStyle where Self == SwitchStyle {
  public static func `switch`(size: SwitchStyle.Size) -> SwitchStyle {
    SwitchStyle(size: size)
  }
}
```

```swift title="swift/Components/TextVariant.swift"
import SwiftUI

public enum TextVariant: CaseIterable, Sendable {
  case `default`, h1, h2, h3, h4, p, blockquote, code, lead, large, small, muted

  var style: TextStyle {
    switch self {
    case .h1: .xl3
    case .h2: .xl2
    case .h3: .xl
    case .h4, .lead, .large: .lg
    case .code, .small, .muted: .sm
    default: .base
    }
  }

  var weight: Font.Weight {
    switch self {
    case .h1, .h2: .bold
    case .h3, .h4, .large, .code: .semibold
    case .small: .medium
    default: .regular
    }
  }

  var color: Color {
    switch self {
    case .lead, .muted: .labelSecondary
    default: .label
    }
  }

  var isHeading: Bool {
    switch self {
    case .h1, .h2, .h3, .h4: true
    default: false
    }
  }
}

private struct TextVariantModifier: ViewModifier {
  let variant: TextVariant

  func body(content: Content) -> some View {
    switch variant {
    case .blockquote:
      styled(content)
        .italic()
        .padding(.leading, 12)
        .overlay(alignment: .leading) {
          Rectangle().fill(Color.separator).frame(width: 2)
        }
        .padding(.top, 16)
    case .code:
      styled(content)
        .monospaced()
        .padding(.horizontal, 4)
        .padding(.vertical, 2)
        .background(Color.surfaceSecondary, in: RoundedRectangle(cornerRadius: Radius.sm, style: .continuous))
    case .p:
      styled(content).padding(.top, 12)
    default:
      styled(content)
    }
  }

  private func styled(_ content: Content) -> some View {
    content
      .scaledTextStyle(variant.style, weight: variant.weight)
      .foregroundStyle(variant.color)
      .accessibilityAddTraits(variant.isHeading ? .isHeader : [])
  }
}

extension View {
  public func textVariant(_ variant: TextVariant) -> some View {
    modifier(TextVariantModifier(variant: variant))
  }
}

private struct ScaledTextStyleModifier: ViewModifier {
  let style: TextStyle
  let weight: Font.Weight

  @ScaledMetric(relativeTo: .body) private var scale: CGFloat = 1

  func body(content: Content) -> some View {
    let size = style.size * scale
    let lineSpacing = max(0, style.lineHeight * scale - UIFont.systemFont(ofSize: size).lineHeight)
    content
      .font(.system(size: size, weight: weight))
      .tracking(style.letterSpacing)
      .lineSpacing(lineSpacing)
      .padding(.vertical, lineSpacing / 2)
  }
}

extension View {
  func scaledTextStyle(_ style: TextStyle, weight: Font.Weight = .regular) -> some View {
    modifier(ScaledTextStyleModifier(style: style, weight: weight))
  }

  func scaledFont(_ style: TextStyle, weight: Font.Weight = .regular) -> some View {
    modifier(ScaledFontModifier(style: style, weight: weight))
  }
}

private struct ScaledFontModifier: ViewModifier {
  let style: TextStyle
  let weight: Font.Weight

  @ScaledMetric(relativeTo: .body) private var scale: CGFloat = 1

  func body(content: Content) -> some View {
    content
      .font(.system(size: style.size * scale, weight: weight))
      .tracking(style.letterSpacing)
  }
}
```

```swift title="swift/Components/Toggle.swift"
import SwiftUI

public enum ToggleVariant: CaseIterable, Sendable {
  case `default`, outline
}

public enum ToggleSize: CaseIterable, Sendable {
  case `default`, sm, lg

  var height: CGFloat {
    switch self {
    case .default: 36
    case .sm: 32
    case .lg: 40
    }
  }

  var horizontalPadding: CGFloat {
    self == .lg ? 16 : 12
  }
}

public struct VariantToggleStyle: ToggleStyle {
  let variant: ToggleVariant
  let size: ToggleSize

  public init(_ variant: ToggleVariant = .default, size: ToggleSize = .default) {
    self.variant = variant
    self.size = size
  }

  public func makeBody(configuration: Configuration) -> some View {
    HapticButton(style: PressReader { pressed in
      ToggleSurface(isOn: configuration.isOn, pressed: pressed, variant: variant, size: size) {
        configuration.label
      }
    }) {
      configuration.isOn.toggle()
      return true
    }
    .accessibilityAddTraits(configuration.isOn ? .isSelected : [])
  }
}

extension ToggleStyle where Self == VariantToggleStyle {
  public static func variant(_ variant: ToggleVariant = .default, size: ToggleSize = .default) -> VariantToggleStyle {
    VariantToggleStyle(variant, size: size)
  }
}

struct ToggleSurface<Content: View>: View {
  let isOn: Bool
  let pressed: Bool
  let variant: ToggleVariant
  let size: ToggleSize
  var shape = AnyShape(RoundedRectangle(cornerRadius: Radius.lg, style: .continuous))
  var bordered = true
  let content: Content

  @Environment(\.isEnabled) private var isEnabled
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  init(
    isOn: Bool,
    pressed: Bool,
    variant: ToggleVariant,
    size: ToggleSize,
    shape: AnyShape? = nil,
    bordered: Bool = true,
    @ViewBuilder content: () -> Content
  ) {
    self.isOn = isOn
    self.pressed = pressed
    self.variant = variant
    self.size = size
    if let shape { self.shape = shape }
    self.bordered = bordered
    self.content = content()
  }

  var body: some View {
    content
      .labelStyle(ButtonLabelStyle(spacing: 4, iconSize: 16))
      .scaledFont(.sm)
      .lineLimit(1)
      .foregroundStyle(foreground)
      .padding(.horizontal, size.horizontalPadding)
      .frame(minWidth: size.height, minHeight: size.height)
      .background(background, in: shape)
      .overlay {
        if variant == .outline && bordered {
          shape.stroke(Color.separator, lineWidth: 1).padding(0.5)
        }
      }
      .contentShape(shape)
      .scaleEffect(pressed && isEnabled && !reduceMotion ? 0.96 : 1)
      .animation(reduceMotion ? nil : .easeOut(duration: 0.15), value: pressed)
  }

  private var foreground: Color {
    if !isEnabled { return .labelQuaternary }
    return isOn ? .link : .label
  }

  private var background: Color {
    if !isEnabled { return isOn ? .controlDisabled : .clear }
    if isOn { return pressed ? .itemPressed : .itemSelected }
    return pressed ? .itemPressed : .clear
  }
}
```

```swift title="swift/Components/ToggleGroup.swift"
import SwiftUI

struct ToggleGroupContext {
  var variant: ToggleVariant
  var size: ToggleSize
  var spacing: Int
  var orientation: Axis
  var namespace: Namespace.ID
  var multiple: Bool
  var isSelected: (AnyHashable) -> Bool
  var toggle: (AnyHashable) -> Void

  var segmented: Bool { spacing == 0 && variant == .default }
  var attached: Bool { spacing == 0 && variant == .outline }
}

extension EnvironmentValues {
  @Entry var toggleGroup: ToggleGroupContext?
}

public struct ToggleGroup<Value: Hashable, Content: View>: View {
  let variant: ToggleVariant
  let size: ToggleSize
  let spacing: Int
  let orientation: Axis
  let multiple: Bool
  let isSelected: (Value) -> Bool
  let toggle: (Value) -> Void
  let content: Content

  @Namespace private var namespace
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  public init(
    selection: Binding<Value?>,
    variant: ToggleVariant = .default,
    size: ToggleSize = .default,
    spacing: Int = 2,
    orientation: Axis = .horizontal,
    @ViewBuilder content: () -> Content
  ) {
    self.variant = variant
    self.size = size
    self.spacing = spacing
    self.orientation = orientation
    multiple = false
    isSelected = { selection.wrappedValue == $0 }
    toggle = { value in
      selection.wrappedValue = selection.wrappedValue == value ? nil : value
    }
    self.content = content()
  }

  public init(
    selection: Binding<Set<Value>>,
    variant: ToggleVariant = .default,
    size: ToggleSize = .default,
    spacing: Int = 2,
    orientation: Axis = .horizontal,
    @ViewBuilder content: () -> Content
  ) {
    self.variant = variant
    self.size = size
    self.spacing = spacing
    self.orientation = orientation
    multiple = true
    isSelected = { selection.wrappedValue.contains($0) }
    toggle = { value in
      if selection.wrappedValue.contains(value) {
        selection.wrappedValue.remove(value)
      } else {
        selection.wrappedValue.insert(value)
      }
    }
    self.content = content()
  }

  public var body: some View {
    let context = ToggleGroupContext(
      variant: variant,
      size: size,
      spacing: spacing,
      orientation: orientation,
      namespace: namespace,
      multiple: multiple,
      isSelected: { value in (value.base as? Value).map(isSelected) ?? false },
      toggle: { value in
        guard let value = value.base as? Value else { return }
        if reduceMotion {
          toggle(value)
        } else {
          withAnimation(.timingCurve(0.32, 0.72, 0, 1, duration: 0.3)) { toggle(value) }
        }
      }
    )
    container
      .environment(\.toggleGroup, context)
      .accessibilityElement(children: .contain)
  }

  private var segmented: Bool { spacing == 0 && variant == .default }

  private var attached: Bool { spacing == 0 && variant == .outline }

  private var gap: CGFloat {
    segmented ? 4 : CGFloat(spacing) * 4
  }

  @ViewBuilder private var stack: some View {
    switch orientation {
    case .horizontal:
      HStack(spacing: gap) { content }
    case .vertical:
      VStack(alignment: .leading, spacing: gap) { content }
    }
  }

  @ViewBuilder private var container: some View {
    if segmented {
      let shape = RoundedRectangle(cornerRadius: Radius.xl, style: .continuous)
      stack
        .padding(4)
        .background(Color.control, in: shape)
    } else if attached {
      let shape = RoundedRectangle(cornerRadius: orientation == .vertical ? Radius.xl : Radius.lg, style: .continuous)
      stack
        .padding(1)
        .clipShape(shape)
        .overlay {
          shape.stroke(Color.separator, lineWidth: 1).padding(0.5)
        }
    } else {
      stack
    }
  }
}

public struct ToggleGroupItem<Value: Hashable, Label: View>: View {
  let value: Value
  let label: Label

  @Environment(\.toggleGroup) private var group
  @Environment(\.isEnabled) private var isEnabled
  @Environment(\.colorScheme) private var colorScheme

  public init(value: Value, @ViewBuilder label: () -> Label) {
    self.value = value
    self.label = label()
  }

  public var body: some View {
    let isOn = group?.isSelected(AnyHashable(value)) ?? false
    HapticButton(style: PressReader { pressed in
      item(isOn: isOn, pressed: pressed)
    }) {
      guard let group else { return false }
      group.toggle(AnyHashable(value))
      return true
    }
    .accessibilityAddTraits(isOn ? .isSelected : [])
  }

  @ViewBuilder private func item(isOn: Bool, pressed: Bool) -> some View {
    let variant = group?.variant ?? .default
    let size = group?.size ?? .default
    if let group, group.segmented {
      let shape = RoundedRectangle(cornerRadius: Radius.md, style: .continuous)
      label
        .labelStyle(ButtonLabelStyle(spacing: 4, iconSize: 16))
        .scaledFont(.sm)
        .lineLimit(1)
        .foregroundStyle(!isEnabled ? Color.labelQuaternary : isOn ? .label : .labelSecondary)
        .padding(.horizontal, 12)
        .frame(minWidth: size.height, minHeight: size.height)
        .frame(maxWidth: group.orientation == .vertical ? .infinity : nil)
        .background {
          if isOn {
            if isEnabled {
              shape
                .fill(colorScheme == .dark ? Color.labelQuaternary : .surfaceRaised)
                .shadow(.thumb)
                .matchedGeometryEffect(id: group.multiple ? AnyHashable(value) : AnyHashable("indicator"), in: group.namespace)
            } else {
              shape.fill(Color.controlDisabled)
            }
          }
        }
        .contentShape(shape)
    } else if let group, group.attached {
      ToggleSurface(
        isOn: isOn,
        pressed: pressed,
        variant: variant,
        size: size,
        shape: AnyShape(Rectangle()),
        bordered: false
      ) {
        label
      }
      .frame(maxWidth: group.orientation == .vertical ? .infinity : nil)
      .overlay(alignment: group.orientation == .vertical ? .top : .leading) {
        if group.orientation == .vertical {
          Color.separator.frame(height: 1).offset(y: -1)
        } else {
          Color.separator.frame(width: 1).offset(x: -1)
        }
      }
    } else {
      ToggleSurface(isOn: isOn, pressed: pressed, variant: variant, size: size) {
        label
      }
      .frame(maxWidth: group?.orientation == .vertical ? .infinity : nil)
    }
  }
}

extension ToggleGroupItem where Label == Text {
  public init(_ title: LocalizedStringKey, value: Value) {
    self.init(value: value) { Text(title) }
  }
}
```

```swift title="swift/Patterns/Adaptive.swift"
import SwiftUI

extension EnvironmentValues {
  @Entry var patternCompact: Bool? = nil
}

@propertyWrapper
struct CompactLayout: DynamicProperty {
  @Environment(\.patternCompact) private var forced
  @Environment(\.horizontalSizeClass) private var sizeClass

  init() {}

  var wrappedValue: Bool {
    forced ?? (sizeClass != .regular)
  }
}

extension Binding where Value == Bool {
  func gated(_ enabled: Bool) -> Binding<Bool> {
    Binding(
      get: { enabled && wrappedValue },
      set: { wrappedValue = $0 }
    )
  }
}
```

```swift title="swift/Patterns/OptionPicker.swift"
import PhosphorSwift
import SwiftUI

extension EnvironmentValues {
  @Entry var optionPickerNative = false
}

public struct OptionPicker<Value: Hashable & Sendable, Content: View>: View {
  public typealias Size = SelectSize

  let selection: Binding<Value?>
  let placeholder: LocalizedStringKey
  let size: Size
  let content: () -> Content

  @State private var labels: [AnyHashable: Text] = [:]
  @CompactLayout private var compact
  @Environment(\.isEnabled) private var isEnabled
  @Environment(\.isInvalid) private var invalid
  @Environment(\.colorScheme) private var colorScheme

  public init(
    selection: Binding<Value?>,
    placeholder: LocalizedStringKey = "Select",
    size: Size = .default,
    @ViewBuilder content: @escaping () -> Content
  ) {
    self.selection = selection
    self.placeholder = placeholder
    self.size = size
    self.content = content
  }

  public var body: some View {
    if compact {
      native
    } else {
      SelectField(selection: selection, placeholder: placeholder, size: size, content: content)
    }
  }

  private var native: some View {
    let binding = selection
    let erased = Binding<AnyHashable?>(
      get: { binding.wrappedValue.map { AnyHashable($0) } },
      set: { value in binding.wrappedValue = value?.base as? Value }
    )
    let valueText = binding.wrappedValue.flatMap { labels[AnyHashable($0)] }
    let shape = RoundedRectangle(cornerRadius: size == .sm ? Radius.md : Radius.lg, style: .continuous)
    return Menu {
      Picker(selection: erased) {
        content().environment(\.optionPickerNative, true)
      } label: {
        Text(placeholder)
      }
      .pickerStyle(.inline)
    } label: {
      HStack(spacing: 6) {
        (valueText ?? Text(placeholder))
          .scaledFont(.base)
          .lineLimit(1)
          .foregroundStyle(!isEnabled ? Color.labelQuaternary : valueText == nil ? .labelSecondary : .label)
          .frame(maxWidth: .infinity, alignment: .leading)
        Ph.caretUpDown.regular
          .frame(width: 16, height: 16)
          .foregroundStyle(Color.labelSecondary)
          .accessibilityHidden(true)
      }
      .padding(.horizontal, 12)
      .frame(minHeight: size == .sm ? 36 : 44)
      .background(background, in: shape)
      .overlay {
        if invalid {
          shape.strokeBorder(Color.danger)
        }
      }
      .contentShape(shape)
    }
    .tint(Color.label)
    .accessibilityLabel(valueText ?? Text(placeholder))
    .accessibilityHint(Text("Shows options"))
    .background {
      VStack(spacing: 0) { content() }
        .environment(\.select, SelectContext(registering: true))
        .hidden()
        .frame(width: 0, height: 0)
        .clipped()
        .accessibilityHidden(true)
        .allowsHitTesting(false)
    }
    .onPreferenceChange(SelectLabelsKey.self) { value in
      labels = value
    }
  }

  private var background: Color {
    if !isEnabled { return .controlDisabled }
    if invalid { return .danger.opacity(colorScheme == .dark ? 0.1 : 0.05) }
    return .control
  }
}

public struct OptionPickerItem: View {
  let tag: AnyHashable
  let title: Text
  let item: SelectItem

  @Environment(\.optionPickerNative) private var native

  public init<Value: Hashable & Sendable>(_ title: LocalizedStringKey, value: Value) {
    tag = AnyHashable(value)
    self.title = Text(title)
    item = SelectItem(title, value: value)
  }

  public init<Value: Hashable & Sendable>(verbatim title: String, value: Value) {
    tag = AnyHashable(value)
    self.title = Text(verbatim: title)
    item = SelectItem(verbatim: title, value: value)
  }

  public var body: some View {
    if native {
      title.tag(Optional(tag))
    } else {
      item
    }
  }
}

public struct OptionPickerGroup<Content: View>: View {
  let label: LocalizedStringKey?
  let content: Content

  @Environment(\.optionPickerNative) private var native

  public init(_ label: LocalizedStringKey? = nil, @ViewBuilder content: () -> Content) {
    self.label = label
    self.content = content()
  }

  public var body: some View {
    if native {
      if let label {
        Section(label) { content }
      } else {
        Section { content }
      }
    } else {
      SelectGroup {
        if let label {
          SelectLabel(label)
        }
        content
      }
    }
  }
}

public struct OptionPickerSeparator: View {
  @Environment(\.optionPickerNative) private var native

  public init() {}

  public var body: some View {
    if !native {
      SelectSeparator()
    }
  }
}
```

5. Add the files to your app target.

**Jetpack Compose**

1. Set `minSdk` to 24 or higher and add the dependencies:

```kotlin title="build.gradle.kts"
implementation(platform("androidx.compose:compose-bom:2026.09.00"))
implementation("androidx.compose.foundation:foundation")
implementation("androidx.compose.ui:ui")
implementation("com.adamglin:phosphor-icon-android:1.0.0")
```

2. Copy the theme files every view uses:

```kt title="kotlin/theme/Theme.kt"
package com.esuiss.ui.theme

import androidx.compose.foundation.isSystemInDarkTheme
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.Immutable
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.dropShadow
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.Shape
import androidx.compose.ui.graphics.shadow.Shadow as DropShadow
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.style.LineHeightStyle
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.DpOffset
import androidx.compose.ui.unit.em
import androidx.compose.ui.unit.sp

internal fun textStyle(size: Double, lineHeight: Double, letterSpacing: Double) = TextStyle(
    fontSize = size.sp,
    lineHeight = lineHeight.sp,
    letterSpacing = letterSpacing.em,
    lineHeightStyle = LineHeightStyle(
        alignment = LineHeightStyle.Alignment.Center,
        trim = LineHeightStyle.Trim.None,
    ),
)

@Immutable
data class Shadow(
    val offsetX: Dp,
    val offsetY: Dp,
    val blur: Dp,
    val color: Color,
)

fun Modifier.shadow(shadow: Shadow, shape: Shape): Modifier = dropShadow(
    shape,
    DropShadow(
        radius = shadow.blur,
        color = shadow.color,
        offset = DpOffset(shadow.offsetX, shadow.offsetY),
    ),
)

val LocalColors = staticCompositionLocalOf { LightColors }

object EsuissTheme {
    val colors: Colors
        @Composable get() = LocalColors.current

    val typography: Typography
        get() = Typography

    val radius: Radius
        get() = Radius

    val shadows: Shadows
        get() = Shadows
}

@Composable
fun EsuissTheme(
    darkTheme: Boolean = isSystemInDarkTheme(),
    content: @Composable () -> Unit,
) {
    CompositionLocalProvider(
        LocalColors provides if (darkTheme) DarkColors else LightColors,
        content = content,
    )
}
```

```kt title="kotlin/theme/Tokens.kt"
package com.esuiss.ui.theme

import androidx.compose.runtime.Immutable
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.dp

@Immutable
data class Colors(
    val surface: Color,
    val surfaceSecondary: Color,
    val surfaceTertiary: Color,
    val surfaceRaised: Color,
    val label: Color,
    val labelSecondary: Color,
    val labelTertiary: Color,
    val labelQuaternary: Color,
    val control: Color,
    val controlPressed: Color,
    val controlSelected: Color,
    val controlDisabled: Color,
    val onControlSelected: Color,
    val itemPressed: Color,
    val itemSelected: Color,
    val separator: Color,
    val separatorStrong: Color,
    val accent: Color,
    val accentPressed: Color,
    val accentSelected: Color,
    val accentDisabled: Color,
    val onAccent: Color,
    val accentSurface: Color,
    val accentSurfacePressed: Color,
    val link: Color,
    val focus: Color,
    val scrim: Color,
    val media: Color,
    val onMedia: Color,
    val danger: Color,
    val dangerSurface: Color,
    val dangerSurfacePressed: Color,
    val success: Color,
    val successSurface: Color,
    val warning: Color,
    val warningSurface: Color,
    val blue: Color,
    val green: Color,
    val orange: Color,
    val red: Color,
    val yellow: Color,
    val purple: Color,
    val pink: Color,
    val indigo: Color,
    val teal: Color,
    val mint: Color,
    val cyan: Color,
    val brown: Color,
    val gray: Color,
    val isDark: Boolean,
)

val LightColors = Colors(
    surface = Color(0xFFFFFFFF),
    surfaceSecondary = Color(0xFFF5F5F7),
    surfaceTertiary = Color(0xFFE8E8ED),
    surfaceRaised = Color(0xFFFFFFFF),
    label = Color(0xFF1D1D1F),
    labelSecondary = Color(0xFF6E6E73),
    labelTertiary = Color(0xFF86868B),
    labelQuaternary = Color(0xFFD2D2D7),
    control = Color(0xFF000000).copy(alpha = 0.04f),
    controlPressed = Color(0xFF000000).copy(alpha = 0.12f),
    controlSelected = Color(0xFF1D1D1F),
    controlDisabled = Color(0xFF000000).copy(alpha = 0.03f),
    onControlSelected = Color(0xFFFFFFFF),
    itemPressed = Color(0xFF000000).copy(alpha = 0.08f),
    itemSelected = Color(0xFF000000).copy(alpha = 0.06f),
    separator = Color(0xFFD2D2D7),
    separatorStrong = Color(0xFF86868B),
    accent = Color(0xFF0071E3),
    accentPressed = Color(0xFF005BB8),
    accentSelected = Color(0xFF0071E3),
    accentDisabled = Color(0xFF0071E3).copy(alpha = 0.4f),
    onAccent = Color(0xFFFFFFFF),
    accentSurface = Color(0xFF0071E3).copy(alpha = 0.09f),
    accentSurfacePressed = Color(0xFF0071E3).copy(alpha = 0.18f),
    link = Color(0xFF0066CC),
    focus = Color(0xFF0071E3),
    scrim = Color(0xFF000000).copy(alpha = 0.48f),
    media = Color(0xFF000000),
    onMedia = Color(0xFFFFFFFF),
    danger = Color(0xFFD0000A),
    dangerSurface = Color(0xFFD70015).copy(alpha = 0.08f),
    dangerSurfacePressed = Color(0xFFD70015).copy(alpha = 0.16f),
    success = Color(0xFF008009),
    successSurface = Color(0xFFEFFAF1),
    warning = Color(0xFFB64400),
    warningSurface = Color(0xFFFFF5EA),
    blue = Color(0xFF007AFF),
    green = Color(0xFF34C759),
    orange = Color(0xFFFF9500),
    red = Color(0xFFFF3B30),
    yellow = Color(0xFFFFCC00),
    purple = Color(0xFFAF52DE),
    pink = Color(0xFFFF2D55),
    indigo = Color(0xFF5856D6),
    teal = Color(0xFF30B0C7),
    mint = Color(0xFF00C7BE),
    cyan = Color(0xFF32ADE6),
    brown = Color(0xFFA2845E),
    gray = Color(0xFF8E8E93),
    isDark = false,
)

val DarkColors = Colors(
    surface = Color(0xFF000000),
    surfaceSecondary = Color(0xFF161617),
    surfaceTertiary = Color(0xFF2C2C2E),
    surfaceRaised = Color(0xFF1D1D1F),
    label = Color(0xFFF5F5F7),
    labelSecondary = Color(0xFFA1A1A6),
    labelTertiary = Color(0xFF86868B),
    labelQuaternary = Color(0xFF424245),
    control = Color(0xFFFFFFFF).copy(alpha = 0.1f),
    controlPressed = Color(0xFFFFFFFF).copy(alpha = 0.22f),
    controlSelected = Color(0xFFF5F5F7),
    controlDisabled = Color(0xFFFFFFFF).copy(alpha = 0.05f),
    onControlSelected = Color(0xFF000000),
    itemPressed = Color(0xFFFFFFFF).copy(alpha = 0.12f),
    itemSelected = Color(0xFFFFFFFF).copy(alpha = 0.1f),
    separator = Color(0xFF424245),
    separatorStrong = Color(0xFF6E6E73),
    accent = Color(0xFF0071E3),
    accentPressed = Color(0xFF004D9E),
    accentSelected = Color(0xFF0071E3),
    accentDisabled = Color(0xFF0071E3).copy(alpha = 0.4f),
    onAccent = Color(0xFFFFFFFF),
    accentSurface = Color(0xFF0071E3).copy(alpha = 0.18f),
    accentSurfacePressed = Color(0xFF0071E3).copy(alpha = 0.3f),
    link = Color(0xFF2997FF),
    focus = Color(0xFF0071E3),
    scrim = Color(0xFF000000).copy(alpha = 0.48f),
    media = Color(0xFF000000),
    onMedia = Color(0xFFFFFFFF),
    danger = Color(0xFFFF5447),
    dangerSurface = Color(0xFFFF453A).copy(alpha = 0.2f),
    dangerSurfacePressed = Color(0xFFFF453A).copy(alpha = 0.36f),
    success = Color(0xFF30D158),
    successSurface = Color(0xFF30D158).copy(alpha = 0.16f),
    warning = Color(0xFFFF9F0A),
    warningSurface = Color(0xFFFF9F0A).copy(alpha = 0.16f),
    blue = Color(0xFF0A84FF),
    green = Color(0xFF30D158),
    orange = Color(0xFFFF9F0A),
    red = Color(0xFFFF453A),
    yellow = Color(0xFFFFD60A),
    purple = Color(0xFFBF5AF2),
    pink = Color(0xFFFF375F),
    indigo = Color(0xFF5E5CE6),
    teal = Color(0xFF40C8E0),
    mint = Color(0xFF66D4CF),
    cyan = Color(0xFF64D2FF),
    brown = Color(0xFFAC8E68),
    gray = Color(0xFF8E8E93),
    isDark = true,
)

object Radius {
    val xs = 3.dp
    val sm = 5.dp
    val md = 8.dp
    val lg = 10.dp
    val xl = 12.dp
    val xl2 = 18.dp
    val xl3 = 28.dp
    val full = 9999.dp
}

object Typography {
    val xs3 = textStyle(11.0, 13.0, 0.006)
    val xs2 = textStyle(12.0, 16.0, 0.0)
    val xs = textStyle(13.0, 18.0, -0.006)
    val sm = textStyle(15.0, 20.0, -0.016)
    val md = textStyle(16.0, 21.0, -0.02)
    val base = textStyle(17.0, 22.0, -0.026)
    val lg = textStyle(20.0, 25.0, -0.023)
    val xl = textStyle(22.0, 28.0, -0.012)
    val xl2 = textStyle(28.0, 34.0, 0.014)
    val xl3 = textStyle(34.0, 41.0, 0.012)

    val all = listOf(xs3, xs2, xs, sm, md, base, lg, xl, xl2, xl3)
}

object Shadows {
    val md = Shadow(2.dp, 4.dp, 12.dp, Color.Black.copy(alpha = 0.08f))
    val lg = Shadow(0.dp, 4.dp, 24.dp, Color.Black.copy(alpha = 0.12f))
}
```

3. Copy the source and every file it uses:

```kt title="kotlin/blocks/SettingsNotifications.kt"
package com.esuiss.ui.blocks

import androidx.compose.animation.AnimatedVisibility
import androidx.compose.animation.animateColorAsState
import androidx.compose.animation.core.CubicBezierEasing
import androidx.compose.animation.core.animateFloatAsState
import androidx.compose.animation.core.tween
import androidx.compose.animation.fadeIn
import androidx.compose.animation.fadeOut
import androidx.compose.animation.slideInVertically
import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.offset
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.selection.toggleable
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.foundation.verticalScroll
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.key
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.mutableStateMapOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.clearAndSetSemantics
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.disabled
import androidx.compose.ui.semantics.heading
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Bold
import com.adamglin.phosphoricons.Fill
import com.adamglin.phosphoricons.bold.Check
import com.adamglin.phosphoricons.fill.ChatCircle
import com.esuiss.ui.components.Icon
import com.esuiss.ui.components.Item
import com.esuiss.ui.components.ItemActions
import com.esuiss.ui.components.ItemContent
import com.esuiss.ui.components.ItemGroup
import com.esuiss.ui.components.ItemGroupVariant
import com.esuiss.ui.components.ItemSeparator
import com.esuiss.ui.components.ItemSize
import com.esuiss.ui.components.ItemTitle
import com.esuiss.ui.components.Screen
import com.esuiss.ui.components.SelectSize
import com.esuiss.ui.components.Switch
import com.esuiss.ui.components.ToggleGroup
import com.esuiss.ui.components.ToggleGroupItem
import com.esuiss.ui.components.ToggleSize
import com.esuiss.ui.patterns.Picker
import com.esuiss.ui.patterns.PickerItemData
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Shadow
import com.esuiss.ui.theme.Typography
import com.esuiss.ui.theme.shadow
import kotlinx.coroutines.delay

private val PopEasing = CubicBezierEasing(0.3f, 1.25f, 0.5f, 1f)

private val RevealEasing = CubicBezierEasing(0.32f, 0.72f, 0f, 1f)

private enum class AlertKind(val label: String, val bars: List<Int>) {
    Lock("Lock Screen", listOf(58, 74)),
    Center("Notification Center", listOf(12, 29, 46, 63)),
    Banner("Banners", listOf(8)),
}

private val PreviewOptions = listOf("Always", "When Unlocked", "Never").map { PickerItemData(it, it) }

private val GroupingOptions = listOf("Automatic", "By App", "Off").map { PickerItemData(it, it) }

private fun bannerFootnote(allow: Boolean, banner: Boolean, style: String): String = when {
    !allow -> "Notifications are off"
    !banner -> "No banners"
    style == "persistent" -> "Banner stays until dismissed"
    else -> "Banner shows briefly"
}

@Composable
fun SettingsNotifications(modifier: Modifier = Modifier) {
    val colors = EsuissTheme.colors
    var allow by rememberSaveable { mutableStateOf(true) }
    val enabled = remember { mutableStateMapOf(AlertKind.Lock to true, AlertKind.Center to true, AlertKind.Banner to true) }
    var bannerStyle by rememberSaveable { mutableStateOf("temporary") }
    var sounds by rememberSaveable { mutableStateOf(true) }
    var badges by rememberSaveable { mutableStateOf(true) }
    var previews by rememberSaveable { mutableStateOf("Always") }
    var grouping by rememberSaveable { mutableStateOf("Automatic") }
    var bannerKey by remember { mutableIntStateOf(0) }
    var bannerVisible by remember { mutableStateOf(true) }

    LaunchedEffect(bannerStyle, bannerVisible, bannerKey) {
        if (bannerStyle != "temporary" || !bannerVisible) return@LaunchedEffect
        delay(2600)
        bannerVisible = false
    }

    fun replay() {
        bannerKey += 1
        bannerVisible = true
    }

    val body = if (previews == "Never") "Notification" else "Is the weekend trip to the coast still on?"
    val footnote = bannerFootnote(allow, enabled.getValue(AlertKind.Banner), bannerStyle)
    val dim by animateFloatAsState(if (allow) 1f else 0.35f, tween(300), label = "dim")

    Screen(modifier) {
        Column(
            Modifier
                .fillMaxSize()
                .verticalScroll(rememberScrollState())
                .padding(horizontal = 20.dp, vertical = 24.dp),
            verticalArrangement = Arrangement.spacedBy(20.dp),
        ) {
            Row(horizontalArrangement = Arrangement.spacedBy(12.dp), verticalAlignment = Alignment.CenterVertically) {
                Box(
                    Modifier
                        .size(40.dp)
                        .background(colors.green, RoundedCornerShape(10.dp)),
                    contentAlignment = Alignment.Center,
                ) {
                    Icon(PhosphorIcons.Fill.ChatCircle, contentDescription = null, size = 24.dp, tint = colors.onAccent)
                }
                Column {
                    BasicText(
                        "Messages",
                        modifier = Modifier.semantics { heading() },
                        style = Typography.xl2.copy(color = colors.label, fontWeight = FontWeight.Bold),
                    )
                    BasicText("Notifications", style = Typography.sm.copy(color = colors.labelSecondary))
                }
            }
            ItemGroup(variant = ItemGroupVariant.Inset) {
                SettingRow("Allow Notifications") {
                    Switch(
                        checked = allow,
                        onCheckedChange = {
                            allow = it
                            replay()
                        },
                    )
                }
            }
            Column(
                modifier = Modifier
                    .graphicsLayer { alpha = dim }
                    .then(if (allow) Modifier else Modifier.clearAndSetSemantics { disabled() }),
                verticalArrangement = Arrangement.spacedBy(8.dp),
            ) {
                SectionTitle("Alerts")
                ItemGroup(variant = ItemGroupVariant.Inset) {
                    Row(Modifier.padding(horizontal = 8.dp)) {
                        AlertKind.entries.forEach { kind ->
                            AlertTile(
                                kind = kind,
                                selected = enabled.getValue(kind),
                                enabled = allow,
                                modifier = Modifier.weight(1f),
                            ) {
                                enabled[kind] = it
                                replay()
                            }
                        }
                    }
                    if (enabled.getValue(AlertKind.Banner)) {
                        ItemSeparator()
                        SettingRow("Banner Style") {
                            ToggleGroup(
                                value = bannerStyle,
                                onValueChange = { value ->
                                    if (value != null) {
                                        bannerStyle = value
                                        replay()
                                    }
                                },
                                size = ToggleSize.Sm,
                                spacing = 0,
                                enabled = allow,
                            ) {
                                ToggleGroupItem("Temporary", "temporary")
                                ToggleGroupItem("Persistent", "persistent")
                            }
                        }
                    }
                    ItemSeparator()
                    SettingRow("Sounds") { Switch(checked = sounds, onCheckedChange = { sounds = it }, enabled = allow) }
                    ItemSeparator()
                    SettingRow("Badges") { Switch(checked = badges, onCheckedChange = { badges = it }, enabled = allow) }
                }
                SectionTitle("Appearance", Modifier.padding(top = 12.dp))
                ItemGroup(variant = ItemGroupVariant.Inset) {
                    SettingRow("Show Previews") {
                        Picker(
                            value = previews,
                            onValueChange = {
                                previews = it
                                replay()
                            },
                            items = PreviewOptions,
                            size = SelectSize.Sm,
                            enabled = allow,
                        )
                    }
                    ItemSeparator()
                    SettingRow("Notification Grouping") {
                        Picker(
                            value = grouping,
                            onValueChange = { grouping = it },
                            items = GroupingOptions,
                            size = SelectSize.Sm,
                            enabled = allow,
                        )
                    }
                }
            }
            LockScreenPreview(
                showBanner = allow && enabled.getValue(AlertKind.Banner) && bannerVisible,
                showLock = allow && enabled.getValue(AlertKind.Lock),
                stacked = grouping != "Off",
                bannerKey = bannerKey,
                body = body,
                footnote = footnote,
                modifier = Modifier
                    .align(Alignment.CenterHorizontally)
                    .padding(top = 8.dp),
            )
        }
    }
}

@Composable
private fun SectionTitle(text: String, modifier: Modifier = Modifier) {
    BasicText(
        text,
        modifier = modifier
            .padding(horizontal = 4.dp)
            .semantics { heading() },
        style = Typography.sm.copy(color = EsuissTheme.colors.label, fontWeight = FontWeight.SemiBold),
    )
}

@Composable
private fun SettingRow(title: String, action: @Composable () -> Unit) {
    Item(size = ItemSize.Sm) {
        ItemContent {
            ItemTitle {
                BasicText(
                    title,
                    style = Typography.base.copy(color = EsuissTheme.colors.label),
                    maxLines = 1,
                    overflow = TextOverflow.Ellipsis,
                )
            }
        }
        ItemActions { action() }
    }
}

@Composable
private fun AlertTile(
    kind: AlertKind,
    selected: Boolean,
    enabled: Boolean,
    modifier: Modifier = Modifier,
    onSelectedChange: (Boolean) -> Unit,
) {
    val colors = EsuissTheme.colors
    val fill by animateColorAsState(if (selected) colors.accent else Color.Transparent, tween(250), label = "fill")
    val edge by animateColorAsState(if (selected) Color.Transparent else colors.separatorStrong, tween(250), label = "edge")
    val check by animateFloatAsState(if (selected) 1f else 0f, tween(250, easing = PopEasing), label = "check")
    Column(
        modifier = modifier
            .clip(RoundedCornerShape(12.dp))
            .toggleable(
                value = selected,
                interactionSource = remember { MutableInteractionSource() },
                indication = null,
                enabled = enabled,
                role = Role.Checkbox,
                onValueChange = onSelectedChange,
            )
            .padding(top = 14.dp, bottom = 12.dp),
        horizontalAlignment = Alignment.CenterHorizontally,
        verticalArrangement = Arrangement.spacedBy(8.dp),
    ) {
        MiniScreen(kind)
        BasicText(
            kind.label,
            modifier = Modifier.padding(horizontal = 2.dp),
            style = Typography.xs.copy(color = colors.label, textAlign = TextAlign.Center),
            minLines = 2,
            maxLines = 2,
            overflow = TextOverflow.Ellipsis,
        )
        Box(
            Modifier
                .size(22.dp)
                .background(fill, CircleShape)
                .border(1.5.dp, edge, CircleShape),
            contentAlignment = Alignment.Center,
        ) {
            Icon(
                PhosphorIcons.Bold.Check,
                contentDescription = null,
                modifier = Modifier.graphicsLayer {
                    scaleX = check
                    scaleY = check
                },
                size = 12.dp,
                tint = colors.onAccent,
            )
        }
    }
}

@Composable
private fun MiniScreen(kind: AlertKind) {
    val colors = EsuissTheme.colors
    val shape = RoundedCornerShape(12.dp)
    Box(
        Modifier
            .size(width = 64.dp, height = 92.dp)
            .clip(shape)
            .background(colors.indigo, shape)
            .border(2.dp, colors.label, shape)
            .clearAndSetSemantics {},
    ) {
        if (kind == AlertKind.Lock) {
            BasicText(
                "9:41",
                modifier = Modifier
                    .fillMaxWidth()
                    .padding(top = 14.dp),
                style = Typography.sm.copy(color = colors.onMedia, fontWeight = FontWeight.SemiBold, textAlign = TextAlign.Center),
            )
        }
        kind.bars.forEachIndexed { index, top ->
            Box(
                Modifier
                    .offset(y = top.dp)
                    .padding(horizontal = 8.dp)
                    .fillMaxWidth()
                    .height(13.dp)
                    .graphicsLayer { alpha = 1f - index * 0.15f }
                    .background(colors.onMedia, RoundedCornerShape(4.dp)),
            )
        }
    }
}

@Composable
private fun LockScreenPreview(
    showBanner: Boolean,
    showLock: Boolean,
    stacked: Boolean,
    bannerKey: Int,
    body: String,
    footnote: String,
    modifier: Modifier = Modifier,
) {
    val colors = EsuissTheme.colors
    val outer = RoundedCornerShape(42.dp)
    val inner = RoundedCornerShape(34.dp)
    Box(
        modifier = modifier
            .size(width = 230.dp, height = 470.dp)
            .shadow(Shadow(0.dp, 20.dp, 50.dp, colors.media.copy(alpha = 0.4f)), outer)
            .background(colors.media, outer)
            .border(1.5.dp, colors.labelTertiary, outer)
            .padding(8.dp)
            .clip(inner)
            .background(colors.indigo)
            .semantics { contentDescription = "Lock screen preview. $footnote." },
    ) {
        Box(
            Modifier
                .align(Alignment.TopCenter)
                .padding(top = 8.dp)
                .size(width = 74.dp, height = 22.dp)
                .background(colors.media, CircleShape),
        )
        Column(
            Modifier
                .fillMaxWidth()
                .padding(top = 50.dp),
            horizontalAlignment = Alignment.CenterHorizontally,
        ) {
            BasicText(
                "Tuesday, October 6",
                style = Typography.xs.copy(color = colors.onMedia.copy(alpha = 0.9f), fontWeight = FontWeight.SemiBold),
            )
            BasicText(
                "9:41",
                style = Typography.xl3.copy(
                    color = colors.onMedia,
                    fontWeight = FontWeight.SemiBold,
                    fontSize = 60.sp,
                    lineHeight = 60.sp,
                    letterSpacing = (-0.05).sp,
                ),
            )
        }
        key(bannerKey) {
            AnimatedVisibility(
                visible = showBanner,
                modifier = Modifier
                    .padding(top = 38.dp, start = 8.dp, end = 8.dp)
                    .fillMaxWidth(),
                enter = fadeIn(tween(800)) + slideInVertically(tween(800, easing = RevealEasing)) { -it },
                exit = fadeOut(tween(300)),
            ) {
                Notification(body, stacked = false)
            }
        }
        if (showLock) {
            Box(
                Modifier
                    .padding(top = 300.dp, start = 8.dp, end = 8.dp)
                    .fillMaxWidth(),
            ) {
                Notification(body, stacked = stacked)
            }
        }
        BasicText(
            footnote,
            modifier = Modifier
                .align(Alignment.BottomCenter)
                .padding(bottom = 14.dp),
            style = Typography.xs3.copy(color = colors.onMedia.copy(alpha = 0.85f), textAlign = TextAlign.Center),
        )
    }
}

@Composable
private fun Notification(body: String, stacked: Boolean) {
    val colors = EsuissTheme.colors
    val ink = colors.media
    val shape = RoundedCornerShape(18.dp)
    Box {
        if (stacked) {
            Box(
                Modifier
                    .matchParentSize()
                    .padding(horizontal = 10.dp)
                    .offset(y = 6.dp)
                    .background(colors.onMedia.copy(alpha = 0.55f), RoundedCornerShape(16.dp)),
            )
        }
        Row(
            modifier = Modifier
                .fillMaxWidth()
                .background(colors.onMedia, shape)
                .padding(horizontal = 12.dp, vertical = 10.dp),
            horizontalArrangement = Arrangement.spacedBy(10.dp),
        ) {
            Box(
                Modifier
                    .size(30.dp)
                    .background(colors.green, RoundedCornerShape(7.dp)),
                contentAlignment = Alignment.Center,
            ) {
                Icon(PhosphorIcons.Fill.ChatCircle, contentDescription = null, size = 18.dp, tint = colors.onMedia)
            }
            Column(Modifier.weight(1f), verticalArrangement = Arrangement.spacedBy(1.dp)) {
                Row(verticalAlignment = Alignment.CenterVertically) {
                    BasicText(
                        "Riley Morgan",
                        modifier = Modifier.weight(1f),
                        style = Typography.xs.copy(color = ink.copy(alpha = 0.88f), fontWeight = FontWeight.SemiBold),
                    )
                    BasicText("now", style = Typography.xs2.copy(color = ink.copy(alpha = 0.55f)))
                }
                BasicText(body, style = Typography.xs.copy(color = ink.copy(alpha = 0.88f)))
            }
        }
    }
}
```

```kt title="kotlin/components/Button.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.clickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsPressedAsState
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.getValue
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.style.TextDecoration
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.Colors
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

enum class ButtonVariant { Default, Outline, Secondary, Tinted, Ghost, Plain, Destructive, Link }

enum class ButtonSize(
    val height: Dp,
    val horizontalPadding: Dp,
    val spacing: Dp,
    val iconSize: Dp,
    val blockRadius: Dp,
    val isIcon: Boolean,
) {
    Default(36.dp, 16.dp, 6.dp, 16.dp, Radius.md, false),
    Xs(24.dp, 11.dp, 4.dp, 12.dp, Radius.sm, false),
    Sm(32.dp, 12.dp, 4.dp, 16.dp, Radius.md, false),
    Lg(44.dp, 22.dp, 6.dp, 16.dp, Radius.lg, false),
    Xl(56.dp, 31.dp, 8.dp, 16.dp, Radius.xl, false),
    Icon(36.dp, 0.dp, 6.dp, 16.dp, Radius.md, true),
    IconXs(24.dp, 0.dp, 4.dp, 12.dp, Radius.sm, true),
    IconSm(32.dp, 0.dp, 4.dp, 16.dp, Radius.md, true),
    IconLg(44.dp, 0.dp, 6.dp, 16.dp, Radius.lg, true),
    IconXl(56.dp, 0.dp, 8.dp, 16.dp, Radius.xl, true),
    ;

    val textStyle: TextStyle
        get() = when (this) {
            Xs, IconXs -> Typography.xs2
            Lg, Xl -> Typography.base
            else -> Typography.sm
        }
}

@Composable
fun Button(
    onClick: () -> Unit,
    modifier: Modifier = Modifier,
    variant: ButtonVariant = ButtonVariant.Default,
    size: ButtonSize = ButtonSize.Default,
    block: Boolean = false,
    enabled: Boolean = true,
    content: @Composable RowScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val interaction = remember { MutableInteractionSource() }
    val pressed by interaction.collectIsPressedAsState()
    val foreground = buttonForeground(variant, colors, enabled)
    val group = LocalButtonGroup.current?.takeIf { variant != ButtonVariant.Ghost && variant != ButtonVariant.Plain }
    RegisterButtonGroupOutline(group, variant == ButtonVariant.Outline)
    val shape = group.itemShape(if (block) RoundedCornerShape(size.blockRadius) else CircleShape)
    val sizing = when {
        block -> Modifier.fillMaxWidth().height(size.height)
        size.isIcon -> Modifier.size(size.height)
        else -> Modifier.height(size.height)
    }

    Row(
        modifier = modifier
            .then(sizing)
            .clip(shape)
            .background(buttonBackground(variant, colors, pressed && enabled, enabled), shape)
            .then(
                when {
                    variant != ButtonVariant.Outline -> Modifier
                    group != null -> Modifier.buttonGroupEdge(group, colors.separator)
                    else -> Modifier.border(1.dp, colors.separator, shape)
                },
            )
            .clickable(
                interactionSource = interaction,
                indication = null,
                enabled = enabled,
                role = Role.Button,
                onClick = onClick,
            )
            .padding(horizontal = size.horizontalPadding),
        horizontalArrangement = Arrangement.spacedBy(size.spacing, Alignment.CenterHorizontally),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        CompositionLocalProvider(
            LocalButtonGroup provides null,
            LocalContentStyle provides size.textStyle.copy(
                color = foreground,
                textDecoration = if (variant == ButtonVariant.Link && pressed && enabled) {
                    TextDecoration.Underline
                } else {
                    null
                },
            ),
            LocalContentColor provides foreground,
            LocalIconSize provides size.iconSize,
        ) {
            content()
        }
    }
}

@Composable
fun Button(
    text: String,
    onClick: () -> Unit,
    modifier: Modifier = Modifier,
    variant: ButtonVariant = ButtonVariant.Default,
    size: ButtonSize = ButtonSize.Default,
    block: Boolean = false,
    enabled: Boolean = true,
) {
    Button(onClick, modifier, variant, size, block, enabled) {
        BasicText(text, style = LocalContentStyle.current, maxLines = 1)
    }
}

private fun buttonForeground(variant: ButtonVariant, colors: Colors, enabled: Boolean): Color =
    when (variant) {
        ButtonVariant.Default -> colors.onAccent
        ButtonVariant.Outline, ButtonVariant.Secondary, ButtonVariant.Ghost ->
            if (enabled) colors.label else colors.labelQuaternary
        ButtonVariant.Tinted, ButtonVariant.Plain ->
            if (enabled) colors.link else colors.link.copy(alpha = 0.4f)
        ButtonVariant.Destructive ->
            if (enabled) colors.danger else colors.danger.copy(alpha = 0.4f)
        ButtonVariant.Link -> if (enabled) colors.link else colors.labelQuaternary
    }

private fun buttonBackground(variant: ButtonVariant, colors: Colors, pressed: Boolean, enabled: Boolean): Color =
    when (variant) {
        ButtonVariant.Default -> when {
            !enabled -> colors.accentDisabled
            pressed -> colors.accentPressed
            else -> colors.accent
        }
        ButtonVariant.Outline -> when {
            pressed -> colors.itemPressed
            colors.isDark -> Color.Transparent
            else -> colors.surface
        }
        ButtonVariant.Secondary -> when {
            !enabled -> colors.controlDisabled
            pressed -> colors.controlPressed
            else -> colors.control
        }
        ButtonVariant.Tinted -> if (pressed) colors.accentSurfacePressed else colors.accentSurface
        ButtonVariant.Ghost -> if (pressed) colors.itemPressed else Color.Transparent
        ButtonVariant.Plain -> if (pressed) colors.itemPressed else Color.Transparent
        ButtonVariant.Destructive -> if (pressed) colors.dangerSurfacePressed else colors.dangerSurface
        ButtonVariant.Link -> Color.Transparent
    }
```

```kt title="kotlin/components/ButtonGroup.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.background
import androidx.compose.foundation.gestures.Orientation
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.CornerSize
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.DisposableEffect
import androidx.compose.runtime.Immutable
import androidx.compose.runtime.Stable
import androidx.compose.runtime.compositionLocalOf
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.draw.drawBehind
import androidx.compose.ui.draw.drawWithContent
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.RectangleShape
import androidx.compose.ui.graphics.Shape
import androidx.compose.ui.graphics.drawOutline
import androidx.compose.ui.graphics.drawscope.Stroke
import androidx.compose.ui.graphics.drawscope.translate
import androidx.compose.ui.graphics.takeOrElse
import androidx.compose.ui.layout.Layout
import androidx.compose.ui.layout.Placeable
import androidx.compose.ui.layout.layout
import androidx.compose.ui.layout.layoutId
import androidx.compose.ui.layout.onPlaced
import androidx.compose.ui.platform.LocalLayoutDirection
import androidx.compose.ui.semantics.isTraversalGroup
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.unit.Constraints
import androidx.compose.ui.unit.LayoutDirection
import androidx.compose.ui.unit.constrainHeight
import androidx.compose.ui.unit.constrainWidth
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

enum class ButtonGroupOrientation { Horizontal, Vertical }

@Stable
internal class ButtonGroupState(val orientation: ButtonGroupOrientation) {
    var nested by mutableIntStateOf(0)
    var outlined by mutableIntStateOf(0)
}

internal val LocalButtonGroup = compositionLocalOf<ButtonGroupState?> { null }

internal object ButtonGroupFill

private object ButtonGroupDivider

internal fun ButtonGroupState?.itemShape(default: Shape): Shape = if (this == null) default else RectangleShape

@Immutable
internal class ButtonGroupItem(val shape: Shape, val modifier: Modifier)

@Composable
internal fun rememberButtonGroupItem(group: ButtonGroupState?, default: Shape): ButtonGroupItem {
    var edges by remember { mutableIntStateOf(0) }
    val horizontal = group?.orientation != ButtonGroupOrientation.Vertical
    val rtl = LocalLayoutDirection.current == LayoutDirection.Rtl
    val shape = remember(edges, horizontal) {
        val round = if (horizontal) CornerSize(50) else CornerSize(Radius.xl2)
        val square = CornerSize(0)
        val start = if (edges and 1 != 0) round else square
        val end = if (edges and 2 != 0) round else square
        if (horizontal) {
            RoundedCornerShape(topStart = start, topEnd = end, bottomEnd = end, bottomStart = start)
        } else {
            RoundedCornerShape(topStart = start, topEnd = start, bottomEnd = end, bottomStart = end)
        }
    }
    if (group == null || group.nested > 0) return ButtonGroupItem(default, Modifier)
    return ButtonGroupItem(
        shape = shape,
        modifier = Modifier.onPlaced { coordinates ->
            val parent = coordinates.parentLayoutCoordinates ?: return@onPlaced
            val bounds = parent.localBoundingBoxOf(coordinates, clipBounds = false)
            val first: Boolean
            val last: Boolean
            if (horizontal) {
                val left = bounds.left <= 0.5f
                val right = bounds.right >= parent.size.width - 0.5f
                first = if (rtl) right else left
                last = if (rtl) left else right
            } else {
                first = bounds.top <= 0.5f
                last = bounds.bottom >= parent.size.height - 0.5f
            }
            edges = (if (first) 1 else 0) or (if (last) 2 else 0)
        },
    )
}

internal fun Modifier.buttonGroupEdge(group: ButtonGroupState?, color: Color): Modifier {
    if (group == null) return this
    return drawBehind {
        val stroke = 1.dp.toPx()
        if (group.orientation == ButtonGroupOrientation.Horizontal) {
            val x = if (layoutDirection == LayoutDirection.Rtl) 0f else size.width - stroke
            drawRect(color, Offset(x, 0f), Size(stroke, size.height))
        } else {
            drawRect(color, Offset(0f, size.height - stroke), Size(size.width, stroke))
        }
    }
}

@Composable
internal fun RegisterButtonGroupOutline(group: ButtonGroupState?, outlined: Boolean) {
    DisposableEffect(group, outlined) {
        if (group != null && outlined) group.outlined += 1
        onDispose {
            if (group != null && outlined) group.outlined -= 1
        }
    }
}

@Composable
fun ButtonGroup(
    modifier: Modifier = Modifier,
    orientation: ButtonGroupOrientation = ButtonGroupOrientation.Horizontal,
    content: @Composable () -> Unit,
) {
    val parent = LocalButtonGroup.current
    DisposableEffect(parent) {
        parent?.let { it.nested += 1 }
        onDispose { parent?.let { it.nested -= 1 } }
    }
    val state = remember(orientation) { ButtonGroupState(orientation) }
    val colors = EsuissTheme.colors
    val joined = state.nested == 0
    val horizontal = orientation == ButtonGroupOrientation.Horizontal
    val shape = if (horizontal) CircleShape else RoundedCornerShape(Radius.xl2)
    val outline = colors.separator
    Layout(
        content = {
            CompositionLocalProvider(LocalButtonGroup provides state, content = content)
        },
        modifier = modifier
            .semantics { isTraversalGroup = true }
            .then(
                if (joined) {
                    Modifier
                        .clip(shape)
                        .drawWithContent {
                            drawContent()
                            if (state.outlined > 0) {
                                val stroke = 1.dp.toPx()
                                val inset = stroke / 2
                                val path = shape.createOutline(
                                    Size(size.width - stroke, size.height - stroke),
                                    layoutDirection,
                                    this,
                                )
                                translate(inset, inset) {
                                    drawOutline(path, outline, style = Stroke(stroke))
                                }
                            }
                        }
                } else {
                    Modifier
                },
            ),
    ) { measurables, constraints ->
        val gap = if (joined) 0 else 8.dp.roundToPx()
        val items = measurables.filter { it.layoutId != ButtonGroupDivider }
        if (horizontal) {
            val height = if (constraints.hasFixedHeight) {
                constraints.maxHeight
            } else {
                constraints.constrainHeight(items.maxOfOrNull { it.maxIntrinsicHeight(Constraints.Infinity) } ?: 0)
            }
            val fills = measurables.count { it.layoutId == ButtonGroupFill }
            val placeables = arrayOfNulls<Placeable>(measurables.size)
            var used = 0
            measurables.forEachIndexed { index, measurable ->
                if (measurable.layoutId != ButtonGroupFill) {
                    val placeable = measurable.measure(Constraints(minHeight = height, maxHeight = height))
                    placeables[index] = placeable
                    used += placeable.width
                }
            }
            val gaps = gap * (items.size - 1).coerceAtLeast(0)
            val remaining = if (constraints.hasBoundedWidth) {
                (constraints.maxWidth - used - gaps).coerceAtLeast(0)
            } else {
                0
            }
            measurables.forEachIndexed { index, measurable ->
                if (measurable.layoutId == ButtonGroupFill) {
                    val placeable = if (constraints.hasBoundedWidth) {
                        val width = remaining / fills
                        measurable.measure(Constraints(width, width, height, height))
                    } else {
                        measurable.measure(Constraints(minHeight = height, maxHeight = height))
                    }
                    placeables[index] = placeable
                    used += placeable.width
                }
            }
            val width = constraints.constrainWidth(used + gaps)
            layout(width, height) {
                var x = 0
                measurables.forEachIndexed { index, measurable ->
                    val placeable = placeables[index] ?: return@forEachIndexed
                    val divider = measurable.layoutId == ButtonGroupDivider
                    placeable.placeRelative(x, 0, zIndex = if (divider) 1f else 0f)
                    if (!divider) x += placeable.width + gap
                }
            }
        } else {
            val width = if (constraints.hasFixedWidth) {
                constraints.maxWidth
            } else {
                constraints.constrainWidth(items.maxOfOrNull { it.maxIntrinsicWidth(Constraints.Infinity) } ?: 0)
            }
            val placeables = measurables.map { it.measure(Constraints(minWidth = width, maxWidth = width)) }
            val gaps = gap * (items.size - 1).coerceAtLeast(0)
            val height = constraints.constrainHeight(
                placeables.filterIndexed { index, _ -> measurables[index].layoutId != ButtonGroupDivider }.sumOf { it.height } + gaps,
            )
            layout(width, height) {
                var y = 0
                measurables.forEachIndexed { index, measurable ->
                    val divider = measurable.layoutId == ButtonGroupDivider
                    placeables[index].placeRelative(0, y, zIndex = if (divider) 1f else 0f)
                    if (!divider) y += placeables[index].height + gap
                }
            }
        }
    }
}

@Composable
fun ButtonGroupText(
    modifier: Modifier = Modifier,
    content: @Composable RowScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val shape = LocalButtonGroup.current.itemShape(CircleShape)
    Row(
        modifier = modifier
            .clip(shape)
            .background(colors.control, shape)
            .padding(horizontal = 10.dp),
        horizontalArrangement = Arrangement.spacedBy(8.dp),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        CompositionLocalProvider(
            LocalButtonGroup provides null,
            LocalContentStyle provides Typography.sm.copy(color = colors.label),
            LocalContentColor provides colors.label,
            LocalIconSize provides 16.dp,
        ) {
            content()
        }
    }
}

@Composable
fun ButtonGroupSeparator(
    modifier: Modifier = Modifier,
    orientation: Orientation = Orientation.Vertical,
    color: Color = Color.Unspecified,
) {
    val line = color.takeOrElse { EsuissTheme.colors.label.copy(alpha = 0.2f) }
    Box(
        modifier = modifier
            .layoutId(ButtonGroupDivider)
            .then(
                if (orientation == Orientation.Vertical) {
                    Modifier.layout { measurable, constraints ->
                        val placeable = measurable.measure(constraints.copy(minWidth = 0, maxWidth = 0))
                        layout(0, placeable.height) { placeable.place(0, 0) }
                    }
                } else {
                    Modifier.layout { measurable, constraints ->
                        val placeable = measurable.measure(constraints.copy(minHeight = 0, maxHeight = 0))
                        layout(placeable.width, 0) { placeable.place(0, 0) }
                    }
                },
            )
            .drawBehind {
                val stroke = 1.dp.toPx()
                val inset = 9.dp.toPx()
                if (orientation == Orientation.Vertical) {
                    val x = if (layoutDirection == LayoutDirection.Rtl) -stroke else 0f
                    drawRect(line, Offset(x, inset), Size(stroke, (size.height - inset * 2).coerceAtLeast(0f)))
                } else {
                    drawRect(line, Offset(inset, 0f), Size((size.width - inset * 2).coerceAtLeast(0f), stroke))
                }
            },
    )
}
```

```kt title="kotlin/components/Checkbox.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsPressedAsState
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.selection.triStateToggleable
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.error
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.state.ToggleableState
import androidx.compose.ui.unit.dp
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.Check
import com.adamglin.phosphoricons.regular.Minus
import com.esuiss.ui.theme.Colors
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.shadow

@Composable
fun Checkbox(
    checked: Boolean,
    onCheckedChange: ((Boolean) -> Unit)?,
    modifier: Modifier = Modifier,
    enabled: Boolean = LocalFieldState.current.enabled,
    invalid: Boolean = LocalFieldState.current.invalid,
    interactionSource: MutableInteractionSource? = null,
) {
    TriStateCheckbox(
        state = ToggleableState(checked),
        onClick = onCheckedChange?.let { { it(!checked) } },
        modifier = modifier,
        enabled = enabled,
        invalid = invalid,
        interactionSource = interactionSource,
    )
}

@Composable
fun TriStateCheckbox(
    state: ToggleableState,
    onClick: (() -> Unit)?,
    modifier: Modifier = Modifier,
    enabled: Boolean = LocalFieldState.current.enabled,
    invalid: Boolean = LocalFieldState.current.invalid,
    interactionSource: MutableInteractionSource? = null,
) {
    val colors = EsuissTheme.colors
    val haptics = rememberHaptics()
    val source = interactionSource ?: remember { MutableInteractionSource() }
    val pressed by source.collectIsPressedAsState()
    val on = state != ToggleableState.Off
    val shape = RoundedCornerShape(4.dp)
    val look = selectionControlLook(colors, on, enabled, invalid, pressed)
    val toggle = if (onClick != null) {
        Modifier
            .triStateToggleable(
                state = state,
                interactionSource = source,
                indication = null,
                enabled = enabled,
                role = Role.Checkbox,
                onClick = {
                    haptics.toggle(state != ToggleableState.On)
                    onClick()
                },
            )
            .formTouchTarget()
    } else {
        Modifier
    }
    Box(
        modifier = modifier
            .then(toggle)
            .then(if (invalid) Modifier.semantics { error("Invalid") } else Modifier)
            .size(16.dp)
            .then(if (look.shadow) Modifier.shadow(FormShadowXs, shape) else Modifier)
            .background(look.background, shape)
            .border(1.dp, look.border, shape),
        contentAlignment = Alignment.Center,
    ) {
        if (on) {
            Icon(
                if (state == ToggleableState.Indeterminate) PhosphorIcons.Regular.Minus else PhosphorIcons.Regular.Check,
                contentDescription = null,
                size = 14.dp,
                tint = colors.onAccent,
            )
        }
    }
}

internal class SelectionControlLook(val background: Color, val border: Color, val shadow: Boolean)

internal fun selectionControlLook(
    colors: Colors,
    on: Boolean,
    enabled: Boolean,
    invalid: Boolean,
    pressed: Boolean,
): SelectionControlLook = when {
    on && !enabled -> SelectionControlLook(colors.accentDisabled, Color.Transparent, false)
    on -> {
        val color = if (pressed) colors.accentPressed else colors.accent
        SelectionControlLook(color, color, false)
    }
    !enabled -> SelectionControlLook(
        colors.controlDisabled,
        if (colors.isDark) Color.Transparent else colors.label.copy(alpha = 0.1f),
        false,
    )
    colors.isDark -> SelectionControlLook(
        colors.labelQuaternary,
        if (invalid) colors.danger else Color.Transparent,
        false,
    )
    else -> SelectionControlLook(
        if (pressed) colors.control else colors.surface,
        if (invalid) colors.danger else colors.label.copy(alpha = 0.25f),
        true,
    )
}
```

```kt title="kotlin/components/Content.kt"
package com.esuiss.ui.components

import androidx.compose.runtime.compositionLocalOf
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp

val LocalContentStyle = compositionLocalOf { TextStyle.Default }

val LocalContentColor = compositionLocalOf { Color.Unspecified }

val LocalIconSize = compositionLocalOf { 20.dp }
```

```kt title="kotlin/components/Field.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.background
import androidx.compose.foundation.gestures.Orientation
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.ColumnScope
import androidx.compose.foundation.layout.LayoutScopeMarker
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.heightIn
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.Immutable
import androidx.compose.runtime.remember
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.layout.layout
import androidx.compose.ui.platform.LocalConfiguration
import androidx.compose.ui.semantics.LiveRegionMode
import androidx.compose.ui.semantics.heading
import androidx.compose.ui.semantics.liveRegion
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

enum class FieldOrientation { Vertical, Horizontal, Responsive }

enum class FieldGroupVariant { Default, Inset }

enum class FieldLegendVariant { Legend, Label }

@Immutable
internal class FieldState(val enabled: Boolean, val invalid: Boolean)

internal val LocalFieldState = staticCompositionLocalOf { FieldState(enabled = true, invalid = false) }

private val LocalFieldSetInset = staticCompositionLocalOf { false }

private val LocalFieldGroupVariant = staticCompositionLocalOf<FieldGroupVariant?> { null }

private val LocalFieldInset = staticCompositionLocalOf { false }

@LayoutScopeMarker
@Immutable
interface FieldScope {
    fun Modifier.weight(weight: Float): Modifier
}

private class RowFieldScope(private val scope: RowScope) : FieldScope {
    override fun Modifier.weight(weight: Float): Modifier = with(scope) { this@weight.weight(weight, true) }
}

private object ColumnFieldScope : FieldScope {
    override fun Modifier.weight(weight: Float): Modifier = this
}

@Composable
fun FieldSet(
    modifier: Modifier = Modifier,
    variant: FieldGroupVariant = FieldGroupVariant.Default,
    enabled: Boolean = true,
    content: @Composable ColumnScope.() -> Unit,
) {
    val inset = variant == FieldGroupVariant.Inset
    CompositionLocalProvider(
        LocalFieldSetInset provides inset,
        LocalFieldState provides FieldState(enabled, LocalFieldState.current.invalid),
    ) {
        Column(
            modifier = modifier.fillMaxWidth(),
            verticalArrangement = Arrangement.spacedBy(if (inset) 8.dp else 24.dp),
            content = content,
        )
    }
}

@Composable
fun FieldLegend(
    text: String,
    modifier: Modifier = Modifier,
    variant: FieldLegendVariant = FieldLegendVariant.Legend,
) {
    val colors = EsuissTheme.colors
    val inset = LocalFieldSetInset.current
    val enabled = LocalFieldState.current.enabled
    val style = if (inset) {
        Typography.xs.copy(color = if (enabled) colors.labelSecondary else colors.labelQuaternary)
    } else {
        Typography.base.copy(color = if (enabled) colors.label else colors.labelQuaternary, fontWeight = FontWeight.SemiBold)
    }
    BasicText(
        text = if (inset) text.uppercase() else text,
        modifier = modifier
            .then(if (variant == FieldLegendVariant.Legend) Modifier.semantics { heading() } else Modifier)
            .padding(start = if (inset) 16.dp else 0.dp, bottom = if (inset) 0.dp else 12.dp),
        style = style,
    )
}

@Composable
fun FieldGroup(
    modifier: Modifier = Modifier,
    variant: FieldGroupVariant = FieldGroupVariant.Default,
    content: @Composable () -> Unit,
) {
    val colors = EsuissTheme.colors
    CompositionLocalProvider(
        LocalFieldSetInset provides false,
        LocalFieldGroupVariant provides variant,
    ) {
        if (variant == FieldGroupVariant.Inset) {
            FormDividedStack(
                orientation = Orientation.Vertical,
                dividerColor = colors.separator,
                modifier = modifier
                    .fillMaxWidth()
                    .clip(RoundedCornerShape(Radius.xl2))
                    .background(colors.surfaceSecondary),
                dividerInsetStart = 16.dp,
                content = content,
            )
        } else {
            Column(
                modifier = modifier.fillMaxWidth(),
                verticalArrangement = Arrangement.spacedBy(28.dp),
            ) {
                content()
            }
        }
    }
}

@Composable
fun Field(
    modifier: Modifier = Modifier,
    orientation: FieldOrientation = FieldOrientation.Vertical,
    enabled: Boolean = LocalFieldState.current.enabled,
    invalid: Boolean = false,
    content: @Composable FieldScope.() -> Unit,
) {
    val inset = LocalFieldGroupVariant.current == FieldGroupVariant.Inset
    val horizontal = when (orientation) {
        FieldOrientation.Vertical -> false
        FieldOrientation.Horizontal -> true
        FieldOrientation.Responsive -> LocalConfiguration.current.screenWidthDp >= 768
    }
    val sizing = modifier
        .fillMaxWidth()
        .then(if (inset) Modifier.heightIn(min = 44.dp).padding(horizontal = 16.dp, vertical = 6.dp) else Modifier)
    CompositionLocalProvider(
        LocalFieldGroupVariant provides null,
        LocalFieldInset provides inset,
        LocalFieldState provides FieldState(enabled, invalid),
    ) {
        if (horizontal) {
            Row(
                modifier = sizing,
                horizontalArrangement = Arrangement.spacedBy(12.dp),
                verticalAlignment = Alignment.CenterVertically,
            ) {
                val scope = remember(this) { RowFieldScope(this) }
                scope.content()
            }
        } else {
            Column(
                modifier = sizing,
                verticalArrangement = Arrangement.spacedBy(12.dp, Alignment.CenterVertically),
            ) {
                ColumnFieldScope.content()
            }
        }
    }
}

@Composable
fun FieldScope.FieldContent(
    modifier: Modifier = Modifier,
    content: @Composable ColumnScope.() -> Unit,
) {
    Column(
        modifier = modifier.weight(1f),
        verticalArrangement = Arrangement.spacedBy(4.dp),
        content = content,
    )
}

@Composable
fun FieldLabel(text: String, modifier: Modifier = Modifier) {
    val colors = EsuissTheme.colors
    val enabled = LocalFieldState.current.enabled
    BasicText(
        text = text,
        modifier = modifier,
        style = Typography.base.copy(
            color = if (enabled) colors.label else colors.labelQuaternary,
            fontWeight = if (LocalFieldInset.current) FontWeight.Normal else FontWeight.SemiBold,
        ),
    )
}

@Composable
fun FieldTitle(text: String, modifier: Modifier = Modifier) {
    val colors = EsuissTheme.colors
    val enabled = LocalFieldState.current.enabled
    BasicText(
        text = text,
        modifier = modifier,
        style = Typography.base.copy(
            color = if (enabled) colors.label else colors.labelQuaternary,
            fontWeight = FontWeight.SemiBold,
        ),
    )
}

@Composable
fun FieldDescription(text: String, modifier: Modifier = Modifier) {
    val colors = EsuissTheme.colors
    val inset = LocalFieldSetInset.current
    BasicText(
        text = text,
        modifier = modifier.padding(start = if (inset) 16.dp else 0.dp),
        style = (if (inset) Typography.xs else Typography.sm).copy(color = colors.labelSecondary),
    )
}

@Composable
fun FieldSeparator(
    modifier: Modifier = Modifier,
    text: String? = null,
) {
    val colors = EsuissTheme.colors
    Box(
        modifier = modifier
            .fillMaxWidth()
            .layout { measurable, constraints ->
                val placeable = measurable.measure(constraints)
                val overlap = 8.dp.roundToPx()
                val height = (placeable.height - overlap * 2).coerceAtLeast(0)
                layout(placeable.width, height) { placeable.place(0, -overlap) }
            }
            .heightIn(min = 20.dp),
        contentAlignment = Alignment.Center,
    ) {
        Separator()
        if (text != null) {
            BasicText(
                text = text,
                modifier = Modifier.background(colors.surface).padding(horizontal = 8.dp),
                style = Typography.sm.copy(color = colors.labelSecondary),
            )
        }
    }
}

@Composable
fun FieldError(text: String?, modifier: Modifier = Modifier) {
    if (text.isNullOrEmpty()) return
    BasicText(
        text = text,
        modifier = modifier.semantics { liveRegion = LiveRegionMode.Polite },
        style = Typography.sm.copy(color = EsuissTheme.colors.danger),
    )
}

@Composable
fun FieldError(errors: List<String?>, modifier: Modifier = Modifier) {
    val messages = errors.filterNotNull().filter { it.isNotEmpty() }.distinct()
    val text = when (messages.size) {
        0 -> null
        1 -> messages[0]
        else -> messages.joinToString("\n") { "• $it" }
    }
    FieldError(text, modifier)
}
```

```kt title="kotlin/components/FormSupport.kt"
package com.esuiss.ui.components

import android.provider.Settings
import androidx.compose.animation.core.CubicBezierEasing
import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.gestures.Orientation
import androidx.compose.foundation.text.selection.TextSelectionColors
import androidx.compose.runtime.Composable
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.draw.drawWithContent
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.Shape
import androidx.compose.ui.layout.Layout
import androidx.compose.ui.layout.layout
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.unit.Constraints
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.LayoutDirection
import androidx.compose.ui.unit.constrainHeight
import androidx.compose.ui.unit.constrainWidth
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.Colors
import com.esuiss.ui.theme.Shadow

internal val FormShadowXs = Shadow(0.dp, 1.dp, 2.dp, Color.Black.copy(alpha = 0.05f))

internal val FormShadowSm = Shadow(0.dp, 1.dp, 3.dp, Color.Black.copy(alpha = 0.1f))

internal val FormEasing = CubicBezierEasing(0.32f, 0.72f, 0f, 1f)

internal fun Modifier.formTouchTarget(): Modifier = layout { measurable, constraints ->
    val minimum = 48.dp.roundToPx()
    val placeable = measurable.measure(constraints)
    val width = constraints.constrainWidth(maxOf(placeable.width, minimum))
    val height = constraints.constrainHeight(maxOf(placeable.height, minimum))
    layout(width, height) {
        placeable.place((width - placeable.width) / 2, (height - placeable.height) / 2)
    }
}

@Composable
internal fun formReducedMotion(): Boolean {
    val context = LocalContext.current
    return remember(context) {
        Settings.Global.getFloat(context.contentResolver, Settings.Global.ANIMATOR_DURATION_SCALE, 1f) == 0f
    }
}

internal fun formSelectionColors(colors: Colors) = TextSelectionColors(
    handleColor = colors.accent,
    backgroundColor = colors.accent.copy(alpha = 0.3f),
)

internal fun Modifier.formInputSurface(
    colors: Colors,
    shape: Shape,
    focused: Boolean,
    invalid: Boolean,
    enabled: Boolean,
): Modifier {
    val background = when {
        !enabled -> colors.controlDisabled
        invalid -> colors.danger.copy(alpha = if (colors.isDark) 0.1f else 0.05f)
        else -> colors.control
    }
    val border = when {
        invalid -> colors.danger
        focused -> colors.focus
        else -> Color.Transparent
    }
    return clip(shape).background(background, shape).border(1.dp, border, shape)
}

@Composable
internal fun FormDividedStack(
    orientation: Orientation,
    dividerColor: Color,
    modifier: Modifier = Modifier,
    dividerInsetStart: Dp = 0.dp,
    content: @Composable () -> Unit,
) {
    val boundaries = remember { mutableStateOf(IntArray(0)) }
    val vertical = orientation == Orientation.Vertical
    Layout(
        content = content,
        modifier = modifier.drawWithContent {
            drawContent()
            val stroke = 1.dp.toPx()
            val inset = dividerInsetStart.toPx()
            boundaries.value.forEach { position ->
                if (vertical) {
                    val start = if (layoutDirection == LayoutDirection.Rtl) 0f else inset
                    drawRect(dividerColor, Offset(start, position.toFloat()), Size(size.width - inset, stroke))
                } else {
                    val x = if (layoutDirection == LayoutDirection.Rtl) size.width - position - stroke else position.toFloat()
                    drawRect(dividerColor, Offset(x, 0f), Size(stroke, size.height))
                }
            }
        },
    ) { measurables, constraints ->
        if (vertical) {
            val width = if (constraints.hasFixedWidth) {
                constraints.maxWidth
            } else {
                constraints.constrainWidth(measurables.maxOfOrNull { it.maxIntrinsicWidth(Constraints.Infinity) } ?: 0)
            }
            val placeables = measurables.map {
                it.measure(Constraints(minWidth = width, maxWidth = width))
            }
            val offsets = IntArray(placeables.size)
            var y = 0
            placeables.forEachIndexed { index, placeable ->
                offsets[index] = y
                y += placeable.height
            }
            val next = offsets.drop(1).toIntArray()
            if (!next.contentEquals(boundaries.value)) boundaries.value = next
            layout(width, constraints.constrainHeight(y)) {
                placeables.forEachIndexed { index, placeable -> placeable.placeRelative(0, offsets[index]) }
            }
        } else {
            val height = if (constraints.hasFixedHeight) {
                constraints.maxHeight
            } else {
                constraints.constrainHeight(measurables.maxOfOrNull { it.maxIntrinsicHeight(Constraints.Infinity) } ?: 0)
            }
            val placeables = measurables.map {
                it.measure(Constraints(minHeight = height, maxHeight = height))
            }
            val offsets = IntArray(placeables.size)
            var x = 0
            placeables.forEachIndexed { index, placeable ->
                offsets[index] = x
                x += placeable.width
            }
            val next = offsets.drop(1).toIntArray()
            if (!next.contentEquals(boundaries.value)) boundaries.value = next
            layout(constraints.constrainWidth(x), height) {
                placeables.forEachIndexed { index, placeable -> placeable.placeRelative(offsets[index], 0) }
            }
        }
    }
}
```

```kt title="kotlin/components/Haptics.kt"
package com.esuiss.ui.components

import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.remember
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.hapticfeedback.HapticFeedback
import androidx.compose.ui.hapticfeedback.HapticFeedbackType
import androidx.compose.ui.platform.LocalHapticFeedback

val LocalHapticsEnabled = staticCompositionLocalOf { true }

@Composable
fun ProvideHaptics(enabled: Boolean, content: @Composable () -> Unit) {
    CompositionLocalProvider(LocalHapticsEnabled provides enabled, content = content)
}

internal class Haptics(private val feedback: HapticFeedback, private val enabled: Boolean) {
    fun perform(type: HapticFeedbackType) {
        if (enabled) feedback.performHapticFeedback(type)
    }

    fun toggle(on: Boolean) = perform(if (on) HapticFeedbackType.ToggleOn else HapticFeedbackType.ToggleOff)

    fun selection() = perform(HapticFeedbackType.SegmentTick)
}

@Composable
internal fun rememberHaptics(): Haptics {
    val feedback = LocalHapticFeedback.current
    val enabled = LocalHapticsEnabled.current
    return remember(feedback, enabled) { Haptics(feedback, enabled) }
}
```

```kt title="kotlin/components/Header.kt"
package com.esuiss.ui.components

import androidx.compose.animation.core.animate
import androidx.compose.animation.core.animateFloatAsState
import androidx.compose.animation.core.tween
import androidx.compose.foundation.clickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsPressedAsState
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.Stable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableFloatStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clipToBounds
import androidx.compose.ui.draw.drawWithContent
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.input.nestedscroll.NestedScrollConnection
import androidx.compose.ui.input.nestedscroll.NestedScrollSource
import androidx.compose.ui.layout.Layout
import androidx.compose.ui.layout.layoutId
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.heading
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.unit.Constraints
import androidx.compose.ui.unit.Velocity
import androidx.compose.ui.unit.dp
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.CaretLeft
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography

private val HeaderBarHeight = 44.dp

private enum class HeaderSlot { Back, Start, End, Title, LargeTitle }

enum class HeaderActionsSide { Leading, Trailing }

@Stable
class HeaderState {
    internal var range by mutableFloatStateOf(0f)
    internal var offset by mutableFloatStateOf(0f)

    val collapsedFraction: Float
        get() = if (range <= 0f) 1f else (offset / range).coerceIn(0f, 1f)

    val nestedScrollConnection: NestedScrollConnection = object : NestedScrollConnection {
        override fun onPreScroll(available: Offset, source: NestedScrollSource): Offset {
            if (available.y >= 0f || range <= 0f) return Offset.Zero
            val next = (offset - available.y).coerceAtMost(range)
            val used = next - offset
            offset = next
            return Offset(0f, -used)
        }

        override fun onPostScroll(consumed: Offset, available: Offset, source: NestedScrollSource): Offset {
            if (available.y <= 0f || range <= 0f) return Offset.Zero
            val next = (offset - available.y).coerceAtLeast(0f)
            val used = offset - next
            offset = next
            return Offset(0f, used)
        }

        override suspend fun onPostFling(consumed: Velocity, available: Velocity): Velocity {
            settle()
            return Velocity.Zero
        }
    }

    internal suspend fun settle() {
        if (range <= 0f || offset <= 0f || offset >= range) return
        val target = if (offset < range / 2f) 0f else range
        animate(offset, target, animationSpec = tween(250)) { value, _ -> offset = value }
    }
}

@Composable
fun rememberHeaderState(): HeaderState = remember { HeaderState() }

private val LocalHeaderState = staticCompositionLocalOf<HeaderState?> { null }

@Composable
fun Header(
    modifier: Modifier = Modifier,
    state: HeaderState = rememberHeaderState(),
    content: @Composable () -> Unit,
) {
    val colors = EsuissTheme.colors
    val collapsed = state.range > 0f && state.offset >= state.range
    val separator by animateFloatAsState(if (state.range <= 0f || collapsed) 1f else 0f, tween(150), label = "separator")
    CompositionLocalProvider(LocalHeaderState provides state) {
        Layout(
            content = content,
            modifier = modifier
                .clipToBounds()
                .drawWithContent {
                    drawContent()
                    val stroke = 1.dp.toPx()
                    drawRect(colors.separator.copy(alpha = colors.separator.alpha * separator), Offset(0f, size.height - stroke), Size(size.width, stroke))
                },
        ) { measurables, constraints ->
            val width = constraints.maxWidth
            val bar = HeaderBarHeight.roundToPx()
            val inset = 8.dp.roundToPx()
            val loose = Constraints(maxWidth = width, maxHeight = bar)
            val back = measurables.firstOrNull { it.layoutId == HeaderSlot.Back }?.measure(loose)
            val start = measurables.firstOrNull { it.layoutId == HeaderSlot.Start }?.measure(loose)
            val end = measurables.firstOrNull { it.layoutId == HeaderSlot.End }?.measure(loose)
            val leading = (back?.width ?: 0) + (start?.width ?: 0)
            val side = maxOf(leading, end?.width ?: 0) + inset
            val titleWidth = (width - side * 2).coerceAtLeast(0)
            val title = measurables.firstOrNull { it.layoutId == HeaderSlot.Title }
                ?.measure(Constraints(maxWidth = titleWidth, maxHeight = bar))
            val large = measurables.firstOrNull { it.layoutId == HeaderSlot.LargeTitle }
                ?.measure(Constraints(minWidth = width, maxWidth = width))
            val range = (large?.height ?: 0).toFloat()
            if (state.range != range) state.range = range
            val offset = state.offset.coerceIn(0f, range).toInt()
            val height = bar + (large?.height ?: 0) - offset
            layout(width, height) {
                var x = inset
                back?.let {
                    it.placeRelative(x, (bar - it.height) / 2)
                    x += it.width
                }
                start?.placeRelative(x, (bar - (start.height)) / 2)
                end?.let { it.placeRelative(width - inset - it.width, (bar - it.height) / 2) }
                title?.placeRelative((width - title.width) / 2, (bar - title.height) / 2)
                large?.placeRelative(0, bar - offset)
            }
        }
    }
}

@Composable
fun HeaderTitle(
    text: String,
    modifier: Modifier = Modifier,
    subtitle: String? = null,
) {
    val colors = EsuissTheme.colors
    val state = LocalHeaderState.current
    Column(
        modifier = modifier
            .layoutId(HeaderSlot.Title)
            .graphicsLayer {
                val fraction = state?.collapsedFraction ?: 1f
                alpha = if (state == null || state.range <= 0f) 1f else ((fraction - 0.6f) / 0.4f).coerceIn(0f, 1f)
            }
            .semantics { heading() },
        horizontalAlignment = Alignment.CenterHorizontally,
    ) {
        BasicText(
            text,
            style = Typography.base.copy(color = colors.label, fontWeight = FontWeight.SemiBold, textAlign = TextAlign.Center),
            maxLines = 1,
            overflow = TextOverflow.Ellipsis,
        )
        if (subtitle != null) {
            BasicText(
                subtitle,
                style = Typography.xs2.copy(color = colors.labelSecondary, textAlign = TextAlign.Center),
                maxLines = 1,
                overflow = TextOverflow.Ellipsis,
            )
        }
    }
}

@Composable
fun HeaderLargeTitle(
    text: String,
    modifier: Modifier = Modifier,
    subtitle: String? = null,
) {
    val colors = EsuissTheme.colors
    val state = LocalHeaderState.current
    Column(
        modifier = modifier
            .layoutId(HeaderSlot.LargeTitle)
            .graphicsLayer {
                val fraction = state?.collapsedFraction ?: 0f
                alpha = (1f - fraction * 1.4f).coerceIn(0f, 1f)
            }
            .padding(start = 16.dp, end = 16.dp, top = 4.dp, bottom = 8.dp),
        verticalArrangement = Arrangement.spacedBy(2.dp),
    ) {
        BasicText(
            text,
            modifier = Modifier.semantics { heading() },
            style = Typography.xl3.copy(color = colors.label, fontWeight = FontWeight.Bold),
            maxLines = 2,
            overflow = TextOverflow.Ellipsis,
        )
        if (subtitle != null) {
            BasicText(subtitle, style = Typography.sm.copy(color = colors.labelSecondary))
        }
    }
}

@Composable
fun HeaderBack(
    onClick: () -> Unit,
    modifier: Modifier = Modifier,
    text: String? = "Back",
    contentDescription: String = text ?: "Back",
) {
    val colors = EsuissTheme.colors
    val interaction = remember { MutableInteractionSource() }
    val pressed by interaction.collectIsPressedAsState()
    Row(
        modifier = modifier
            .layoutId(HeaderSlot.Back)
            .height(HeaderBarHeight)
            .clickable(
                interactionSource = interaction,
                indication = null,
                role = Role.Button,
                onClickLabel = contentDescription,
                onClick = onClick,
            )
            .graphicsLayer { alpha = if (pressed) 0.4f else 1f }
            .padding(end = 8.dp),
        horizontalArrangement = Arrangement.spacedBy(2.dp),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        Icon(PhosphorIcons.Regular.CaretLeft, contentDescription = if (text == null) contentDescription else null, size = 24.dp, tint = colors.link)
        if (text != null) {
            BasicText(text, style = Typography.base.copy(color = colors.link), maxLines = 1)
        }
    }
}

@Composable
fun HeaderActions(
    modifier: Modifier = Modifier,
    side: HeaderActionsSide = HeaderActionsSide.Trailing,
    content: @Composable RowScope.() -> Unit,
) {
    Row(
        modifier = modifier.layoutId(if (side == HeaderActionsSide.Leading) HeaderSlot.Start else HeaderSlot.End),
        horizontalArrangement = Arrangement.spacedBy(4.dp),
        verticalAlignment = Alignment.CenterVertically,
        content = content,
    )
}
```

```kt title="kotlin/components/Icon.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.Image
import androidx.compose.foundation.layout.size
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.ColorFilter
import androidx.compose.ui.graphics.takeOrElse
import androidx.compose.ui.graphics.vector.ImageVector
import androidx.compose.ui.unit.Dp
import com.esuiss.ui.theme.EsuissTheme

@Composable
fun Icon(
    imageVector: ImageVector,
    contentDescription: String?,
    modifier: Modifier = Modifier,
    size: Dp = LocalIconSize.current,
    tint: Color = LocalContentColor.current.takeOrElse { EsuissTheme.colors.label },
) {
    Image(
        imageVector = imageVector,
        contentDescription = contentDescription,
        modifier = modifier.size(size),
        colorFilter = ColorFilter.tint(tint),
    )
}
```

```kt title="kotlin/components/Item.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.combinedClickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsPressedAsState
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.BoxScope
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.ColumnScope
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.heightIn
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.DisposableEffect
import androidx.compose.runtime.Stable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.RectangleShape
import androidx.compose.ui.graphics.Shape
import androidx.compose.ui.layout.Layout
import androidx.compose.ui.layout.Measurable
import androidx.compose.ui.layout.Placeable
import androidx.compose.ui.layout.layoutId
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.isTraversalGroup
import androidx.compose.ui.semantics.selected
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.unit.Constraints
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

enum class ItemVariant { Default, Outline, Muted }

enum class ItemSize(
    internal val horizontalPadding: Dp,
    internal val verticalPadding: Dp,
    internal val gap: Dp,
    internal val contentGap: Dp,
    internal val imageSize: Dp,
) {
    Default(16.dp, 14.dp, 14.dp, 4.dp, 40.dp),
    Sm(14.dp, 12.dp, 14.dp, 4.dp, 32.dp),
    Xs(12.dp, 10.dp, 10.dp, 2.dp, 24.dp),
}

enum class ItemGroupVariant { Default, Inset }

enum class ItemMediaVariant { Default, Icon, Image }

private enum class ItemSlot { Media, Content, Actions, Header, Footer }

@Stable
private class ItemState(val size: ItemSize) {
    var descriptions by mutableIntStateOf(0)
}

private val LocalItemState = staticCompositionLocalOf<ItemState?> { null }

internal val LocalItemGroupVariant = staticCompositionLocalOf<ItemGroupVariant?> { null }

@Composable
fun ItemGroup(
    modifier: Modifier = Modifier,
    variant: ItemGroupVariant = ItemGroupVariant.Default,
    content: @Composable ColumnScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val inset = variant == ItemGroupVariant.Inset
    val shape = RoundedCornerShape(Radius.xl2)
    Column(
        modifier = modifier
            .fillMaxWidth()
            .then(if (inset) Modifier.clip(shape).background(colors.surfaceSecondary, shape) else Modifier)
            .semantics { isTraversalGroup = true },
        verticalArrangement = if (inset) Arrangement.Top else Arrangement.spacedBy(16.dp),
    ) {
        CompositionLocalProvider(LocalItemGroupVariant provides variant) {
            content()
        }
    }
}

@Composable
fun ItemSeparator(modifier: Modifier = Modifier) {
    val inset = LocalItemGroupVariant.current == ItemGroupVariant.Inset
    Box(
        modifier = modifier
            .fillMaxWidth()
            .padding(start = if (inset) 16.dp else 0.dp)
            .padding(vertical = if (inset) 0.dp else 8.dp)
            .height(1.dp)
            .background(EsuissTheme.colors.separator),
    )
}

@Composable
fun Item(
    modifier: Modifier = Modifier,
    variant: ItemVariant = ItemVariant.Default,
    size: ItemSize = ItemSize.Default,
    onClick: (() -> Unit)? = null,
    onLongClick: (() -> Unit)? = null,
    enabled: Boolean = true,
    selected: Boolean? = null,
    role: Role? = Role.Button,
    onClickLabel: String? = null,
    content: @Composable () -> Unit,
) {
    val inset = LocalItemGroupVariant.current == ItemGroupVariant.Inset
    val shape = if (inset) RectangleShape else RoundedCornerShape(Radius.xl)
    ItemFrame(
        modifier = modifier,
        variant = variant,
        size = size,
        shape = shape,
        padding = PaddingValues(horizontal = size.horizontalPadding, vertical = size.verticalPadding),
        onClick = onClick,
        onLongClick = onLongClick,
        enabled = enabled,
        selected = selected,
        role = role,
        onClickLabel = onClickLabel,
        content = content,
    )
}

@Composable
internal fun ItemFrame(
    modifier: Modifier,
    variant: ItemVariant,
    size: ItemSize,
    shape: Shape,
    padding: PaddingValues,
    onClick: (() -> Unit)?,
    onLongClick: (() -> Unit)?,
    enabled: Boolean,
    selected: Boolean?,
    role: Role?,
    onClickLabel: String?,
    minHeight: Dp = 0.dp,
    gap: Dp = size.gap,
    content: @Composable () -> Unit,
) {
    val colors = EsuissTheme.colors
    val interaction = remember { MutableInteractionSource() }
    val pressed by interaction.collectIsPressedAsState()
    val state = remember(size) { ItemState(size) }
    val interactive = onClick != null || onLongClick != null
    val background = when {
        pressed && enabled && interactive -> colors.itemPressed
        selected == true -> colors.itemSelected
        variant == ItemVariant.Muted -> colors.surfaceSecondary.copy(alpha = colors.surfaceSecondary.alpha * 0.5f)
        else -> Color.Transparent
    }
    val foreground = if (enabled) colors.label else colors.labelQuaternary
    val behaviour = if (interactive) {
        Modifier
            .heightIn(min = maxOf(minHeight, 48.dp))
            .combinedClickable(
                interactionSource = interaction,
                indication = null,
                enabled = enabled,
                onClickLabel = onClickLabel,
                role = role,
                onLongClick = onLongClick,
                onClick = onClick ?: {},
            )
    } else {
        Modifier
            .heightIn(min = minHeight)
            .semantics(mergeDescendants = true) {}
    }
    Box(
        modifier = modifier
            .fillMaxWidth()
            .clip(shape)
            .background(background, shape)
            .then(if (variant == ItemVariant.Outline) Modifier.border(1.dp, colors.separator, shape) else Modifier)
            .then(if (selected != null) Modifier.semantics { this.selected = selected } else Modifier)
            .then(behaviour)
            .padding(padding),
        contentAlignment = Alignment.CenterStart,
    ) {
        CompositionLocalProvider(
            LocalItemState provides state,
            LocalContentStyle provides Typography.base.copy(color = foreground),
            LocalContentColor provides foreground,
            LocalIconSize provides 16.dp,
        ) {
            ItemLayout(gap, state.descriptions > 0, content)
        }
    }
}

@Composable
private fun ItemLayout(gap: Dp, mediaAtTop: Boolean, content: @Composable () -> Unit) {
    Layout(content = content, modifier = Modifier.fillMaxWidth()) { measurables, constraints ->
        val gapPx = gap.roundToPx()
        val nudge = if (mediaAtTop) 2.dp.roundToPx() else 0
        val lines = mutableListOf<List<Measurable>>()
        var current = mutableListOf<Measurable>()
        measurables.forEach { measurable ->
            val slot = measurable.layoutId
            if (slot == ItemSlot.Header || slot == ItemSlot.Footer) {
                if (current.isNotEmpty()) lines += current
                lines += listOf(measurable)
                current = mutableListOf()
            } else {
                current += measurable
            }
        }
        if (current.isNotEmpty()) lines += current
        val bounded = constraints.hasBoundedWidth
        val available = if (bounded) constraints.maxWidth else Constraints.Infinity
        val measured = lines.map { line ->
            val placeables = arrayOfNulls<Placeable>(line.size)
            val flexIndex = line.indexOfFirst { it.layoutId == ItemSlot.Content }
            var used = gapPx * (line.size - 1).coerceAtLeast(0)
            line.forEachIndexed { index, measurable ->
                if (index == flexIndex) return@forEachIndexed
                val full = measurable.layoutId == ItemSlot.Header || measurable.layoutId == ItemSlot.Footer
                val childConstraints = when {
                    full && bounded -> Constraints(minWidth = available, maxWidth = available)
                    bounded -> Constraints(maxWidth = (available - used).coerceAtLeast(0))
                    else -> Constraints()
                }
                val placeable = measurable.measure(childConstraints)
                placeables[index] = placeable
                used += placeable.width
            }
            if (flexIndex >= 0) {
                val remaining = (available - used).coerceAtLeast(0)
                placeables[flexIndex] = line[flexIndex].measure(
                    if (bounded) Constraints(minWidth = remaining, maxWidth = remaining) else Constraints(),
                )
            }
            placeables.requireNoNulls().toList()
        }
        val width = if (bounded) {
            constraints.maxWidth
        } else {
            measured.maxOfOrNull { line -> line.sumOf { it.width } + gapPx * (line.size - 1).coerceAtLeast(0) } ?: 0
        }
        val lineHeights = measured.mapIndexed { lineIndex, line ->
            line.mapIndexed { index, placeable ->
                val isMedia = lines[lineIndex][index].layoutId == ItemSlot.Media
                placeable.height + if (isMedia) nudge else 0
            }.maxOrNull() ?: 0
        }
        val height = (lineHeights.sum() + gapPx * (measured.size - 1).coerceAtLeast(0))
            .coerceIn(constraints.minHeight, constraints.maxHeight)
        layout(width, height) {
            var y = 0
            measured.forEachIndexed { lineIndex, line ->
                val lineHeight = lineHeights[lineIndex]
                var x = 0
                line.forEachIndexed { index, placeable ->
                    val isMedia = lines[lineIndex][index].layoutId == ItemSlot.Media
                    val top = if (isMedia && mediaAtTop) nudge else (lineHeight - placeable.height) / 2
                    placeable.placeRelative(x, y + top)
                    x += placeable.width + gapPx
                }
                y += lineHeight + gapPx
            }
        }
    }
}

@Composable
fun ItemMedia(
    modifier: Modifier = Modifier,
    variant: ItemMediaVariant = ItemMediaVariant.Default,
    content: @Composable BoxScope.() -> Unit,
) {
    val size = LocalItemState.current?.size ?: ItemSize.Default
    val sizing = when (variant) {
        ItemMediaVariant.Image -> {
            val shape = RoundedCornerShape(if (size == ItemSize.Xs) Radius.sm else Radius.md)
            Modifier.size(size.imageSize).clip(shape)
        }
        else -> Modifier
    }
    Box(
        modifier = modifier.layoutId(ItemSlot.Media).then(sizing),
        contentAlignment = Alignment.Center,
    ) {
        CompositionLocalProvider(LocalIconSize provides if (variant == ItemMediaVariant.Icon) 16.dp else LocalIconSize.current) {
            content()
        }
    }
}

@Composable
fun ItemContent(
    modifier: Modifier = Modifier,
    content: @Composable ColumnScope.() -> Unit,
) {
    val size = LocalItemState.current?.size ?: ItemSize.Default
    Column(
        modifier = modifier.layoutId(ItemSlot.Content),
        verticalArrangement = Arrangement.spacedBy(size.contentGap),
        content = content,
    )
}

@Composable
fun ItemTitle(
    modifier: Modifier = Modifier,
    content: @Composable RowScope.() -> Unit,
) {
    val color = LocalContentColor.current
    Row(
        modifier = modifier,
        horizontalArrangement = Arrangement.spacedBy(8.dp),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        CompositionLocalProvider(
            LocalContentStyle provides Typography.base.copy(color = color, fontWeight = FontWeight.SemiBold),
        ) {
            content()
        }
    }
}

@Composable
fun ItemTitle(text: String, modifier: Modifier = Modifier) {
    val color = LocalContentColor.current
    BasicText(
        text,
        modifier = modifier,
        style = Typography.base.copy(color = color, fontWeight = FontWeight.SemiBold),
        maxLines = 1,
        overflow = TextOverflow.Ellipsis,
    )
}

@Composable
fun ItemDescription(text: String, modifier: Modifier = Modifier) {
    val state = LocalItemState.current
    if (state != null) {
        DisposableEffect(state) {
            state.descriptions += 1
            onDispose { state.descriptions -= 1 }
        }
    }
    BasicText(
        text,
        modifier = modifier,
        style = Typography.sm.copy(color = EsuissTheme.colors.labelSecondary),
        maxLines = 2,
        overflow = TextOverflow.Ellipsis,
    )
}

@Composable
fun ItemActions(
    modifier: Modifier = Modifier,
    content: @Composable RowScope.() -> Unit,
) {
    Row(
        modifier = modifier.layoutId(ItemSlot.Actions),
        horizontalArrangement = Arrangement.spacedBy(8.dp),
        verticalAlignment = Alignment.CenterVertically,
        content = content,
    )
}

@Composable
fun ItemHeader(
    modifier: Modifier = Modifier,
    content: @Composable RowScope.() -> Unit,
) {
    Row(
        modifier = modifier.layoutId(ItemSlot.Header),
        horizontalArrangement = Arrangement.SpaceBetween,
        verticalAlignment = Alignment.CenterVertically,
        content = content,
    )
}

@Composable
fun ItemFooter(
    modifier: Modifier = Modifier,
    content: @Composable RowScope.() -> Unit,
) {
    Row(
        modifier = modifier.layoutId(ItemSlot.Footer),
        horizontalArrangement = Arrangement.SpaceBetween,
        verticalAlignment = Alignment.CenterVertically,
        content = content,
    )
}
```

```kt title="kotlin/components/Label.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography

@Composable
fun Label(
    modifier: Modifier = Modifier,
    enabled: Boolean = true,
    content: @Composable RowScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val color = if (enabled) colors.label else colors.labelQuaternary
    Row(
        modifier = modifier,
        horizontalArrangement = Arrangement.spacedBy(8.dp),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        CompositionLocalProvider(
            LocalContentStyle provides Typography.base.copy(color = color, fontWeight = FontWeight.SemiBold),
            LocalContentColor provides color,
        ) {
            content()
        }
    }
}

@Composable
fun Label(
    text: String,
    modifier: Modifier = Modifier,
    enabled: Boolean = true,
) {
    Label(modifier, enabled) {
        BasicText(text, style = LocalContentStyle.current)
    }
}
```

```kt title="kotlin/components/Overlay.kt"
package com.esuiss.ui.components

import android.os.Build
import android.view.Window
import android.view.WindowManager
import androidx.compose.animation.AnimatedVisibility
import androidx.compose.animation.AnimatedVisibilityScope
import androidx.compose.animation.EnterExitState
import androidx.compose.animation.core.MutableTransitionState
import androidx.compose.animation.core.animateFloat
import androidx.compose.animation.core.tween
import androidx.compose.animation.fadeIn
import androidx.compose.animation.fadeOut
import androidx.compose.animation.scaleIn
import androidx.compose.animation.scaleOut
import androidx.compose.animation.slideIn
import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.clickable
import androidx.compose.foundation.gestures.awaitEachGesture
import androidx.compose.foundation.gestures.awaitFirstDown
import androidx.compose.foundation.gestures.detectTapGestures
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsPressedAsState
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.WindowInsets
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.ime
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.SideEffect
import androidx.compose.runtime.Stable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberUpdatedState
import androidx.compose.runtime.setValue
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.graphics.CompositingStrategy
import androidx.compose.ui.graphics.Shape
import androidx.compose.ui.graphics.TransformOrigin
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.input.pointer.PointerEventPass
import androidx.compose.ui.input.pointer.pointerInput
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.platform.LocalView
import androidx.compose.ui.platform.LocalWindowInfo
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.heading
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.IntOffset
import androidx.compose.ui.unit.IntRect
import androidx.compose.ui.unit.IntSize
import androidx.compose.ui.unit.LayoutDirection
import androidx.compose.ui.unit.dp
import androidx.compose.ui.window.Dialog as WindowDialog
import androidx.compose.ui.window.DialogProperties
import androidx.compose.ui.window.DialogWindowProvider
import androidx.compose.ui.window.Popup
import androidx.compose.ui.window.PopupPositionProvider
import androidx.compose.ui.window.PopupProperties
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.X
import com.esuiss.ui.theme.Colors
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Shadow
import com.esuiss.ui.theme.Shadows
import com.esuiss.ui.theme.Typography
import com.esuiss.ui.theme.shadow
import kotlin.math.max
import kotlin.math.min

enum class PopupSide { Top, Bottom, Left, Right }

enum class PopupAlign { Start, Center, End }

internal val PopupInset = 16.dp

internal val PopupMargin = 8.dp

@Stable
internal class PopupPlacement {
    var anchorWidth by mutableIntStateOf(0)
}

internal class AnchoredPositionProvider(
    private val side: PopupSide,
    private val align: PopupAlign,
    private val sideOffset: Int,
    private val alignOffset: Int,
    private val inset: Int,
    private val margin: Int,
    private val bottomLimit: Int,
    private val point: IntOffset?,
    private val placement: PopupPlacement,
) : PopupPositionProvider {
    override fun calculatePosition(
        anchorBounds: IntRect,
        windowSize: IntSize,
        layoutDirection: LayoutDirection,
        popupContentSize: IntSize,
    ): IntOffset {
        val anchor = if (point != null) {
            val x = anchorBounds.left + point.x
            val y = anchorBounds.top + point.y
            IntRect(x, y, x, y)
        } else {
            anchorBounds
        }
        val width = (popupContentSize.width - inset * 2).coerceAtLeast(0)
        val height = (popupContentSize.height - inset * 2).coerceAtLeast(0)
        val left = margin
        val top = margin
        val right = windowSize.width - margin
        val bottom = min(windowSize.height, bottomLimit) - margin

        fun space(candidate: PopupSide): Int = when (candidate) {
            PopupSide.Bottom -> bottom - anchor.bottom - sideOffset
            PopupSide.Top -> anchor.top - sideOffset - top
            PopupSide.Right -> right - anchor.right - sideOffset
            PopupSide.Left -> anchor.left - sideOffset - left
        }

        val opposite = when (side) {
            PopupSide.Bottom -> PopupSide.Top
            PopupSide.Top -> PopupSide.Bottom
            PopupSide.Left -> PopupSide.Right
            PopupSide.Right -> PopupSide.Left
        }
        val vertical = side == PopupSide.Top || side == PopupSide.Bottom
        val needed = if (vertical) height else width
        val resolved = if (space(side) >= needed || space(side) >= space(opposite)) side else opposite
        val rtl = layoutDirection == LayoutDirection.Rtl

        var x: Int
        var y: Int
        if (vertical) {
            x = when (align) {
                PopupAlign.Start -> if (rtl) anchor.right - width else anchor.left
                PopupAlign.Center -> anchor.left + (anchor.width - width) / 2
                PopupAlign.End -> if (rtl) anchor.left else anchor.right - width
            } + if (rtl) -alignOffset else alignOffset
            y = if (resolved == PopupSide.Bottom) anchor.bottom + sideOffset else anchor.top - sideOffset - height
        } else {
            y = when (align) {
                PopupAlign.Start -> anchor.top
                PopupAlign.Center -> anchor.top + (anchor.height - height) / 2
                PopupAlign.End -> anchor.bottom - height
            } + alignOffset
            x = if (resolved == PopupSide.Right) anchor.right + sideOffset else anchor.left - sideOffset - width
        }
        x = x.coerceIn(left, max(left, right - width))
        y = y.coerceIn(top, max(top, bottom - height))
        placement.anchorWidth = anchorBounds.width
        return IntOffset(x - inset, y - inset)
    }
}

private fun transformOrigin(side: PopupSide): TransformOrigin = when (side) {
    PopupSide.Bottom -> TransformOrigin(0.5f, 0f)
    PopupSide.Top -> TransformOrigin(0.5f, 1f)
    PopupSide.Left -> TransformOrigin(1f, 0.5f)
    PopupSide.Right -> TransformOrigin(0f, 0.5f)
}

@Composable
internal fun AnchoredPopup(
    expanded: Boolean,
    onDismissRequest: () -> Unit,
    side: PopupSide = PopupSide.Bottom,
    align: PopupAlign = PopupAlign.Center,
    sideOffset: Dp = 4.dp,
    alignOffset: Dp = 0.dp,
    focusable: Boolean = true,
    point: IntOffset? = null,
    enterMillis: Int = 150,
    exitMillis: Int = 100,
    content: @Composable (PopupPlacement) -> Unit,
) {
    val transition = remember { MutableTransitionState(false) }
    transition.targetState = expanded
    if (!transition.currentState && !transition.targetState) return

    val density = LocalDensity.current
    val imeBottom = WindowInsets.ime.getBottom(density)
    val containerHeight = LocalWindowInfo.current.containerSize.height
    val bottomLimit = if (containerHeight > 0) containerHeight - imeBottom else Int.MAX_VALUE
    val placement = remember { PopupPlacement() }
    val provider = remember(side, align, sideOffset, alignOffset, point, bottomLimit, density) {
        with(density) {
            AnchoredPositionProvider(
                side = side,
                align = align,
                sideOffset = sideOffset.roundToPx(),
                alignOffset = alignOffset.roundToPx(),
                inset = PopupInset.roundToPx(),
                margin = PopupMargin.roundToPx(),
                bottomLimit = bottomLimit,
                point = point,
                placement = placement,
            )
        }
    }
    val currentExpanded by rememberUpdatedState(expanded)
    val dismiss by rememberUpdatedState(onDismissRequest)
    val properties = PopupProperties(
        focusable = focusable,
        dismissOnBackPress = true,
        dismissOnClickOutside = true,
    )
    val slide = with(density) { 8.dp.roundToPx() }
    val origin = transformOrigin(side)
    Popup(
        popupPositionProvider = provider,
        onDismissRequest = { if (currentExpanded) dismiss() },
        properties = properties,
    ) {
        Box(
            modifier = Modifier
                .pointerInput(Unit) {
                    val insetPx = PopupInset.toPx()
                    detectTapGestures { position ->
                        val inside = position.x >= insetPx && position.y >= insetPx &&
                            position.x <= size.width - insetPx && position.y <= size.height - insetPx
                        if (!inside && currentExpanded) dismiss()
                    }
                }
                .padding(PopupInset),
        ) {
            AnimatedVisibility(
                visibleState = transition,
                enter = scaleIn(tween(enterMillis), initialScale = 0.95f, transformOrigin = origin) +
                    slideIn(tween(enterMillis)) {
                        when (side) {
                            PopupSide.Bottom -> IntOffset(0, -slide)
                            PopupSide.Top -> IntOffset(0, slide)
                            PopupSide.Left -> IntOffset(slide, 0)
                            PopupSide.Right -> IntOffset(-slide, 0)
                        }
                    },
                exit = scaleOut(tween(exitMillis), targetScale = 0.95f, transformOrigin = origin),
            ) {
                Box(fadeWithShadow(enterMillis, exitMillis)) {
                    CompositionLocalProvider(LocalButtonGroup provides null) {
                        content(placement)
                    }
                }
            }
        }
    }
}

@Composable
internal fun ModalWindow(
    visible: Boolean,
    onDismissRequest: () -> Unit,
    dismissOnBackPress: Boolean,
    paneTitle: String?,
    content: @Composable () -> Unit,
) {
    if (!visible) return
    WindowDialog(
        onDismissRequest = onDismissRequest,
        properties = DialogProperties(
            dismissOnBackPress = dismissOnBackPress,
            dismissOnClickOutside = false,
            usePlatformDefaultWidth = false,
            decorFitsSystemWindows = false,
            windowTitle = paneTitle.orEmpty(),
        ),
    ) {
        val window = (LocalView.current.parent as? DialogWindowProvider)?.window
        SideEffect {
            window?.apply {
                setDimAmount(0f)
                clearFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND)
                setLayout(WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.MATCH_PARENT)
                val params = attributes
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
                    params.fitInsetsTypes = 0
                    params.fitInsetsSides = 0
                    params.layoutInDisplayCutoutMode = WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_ALWAYS
                } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
                    params.layoutInDisplayCutoutMode = WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES
                }
                attributes = params
                addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS)
                clearSystemBarColors()
            }
        }
        CompositionLocalProvider(LocalButtonGroup provides null, content = content)
    }
}

@Suppress("DEPRECATION")
private fun Window.clearSystemBarColors() {
    statusBarColor = android.graphics.Color.TRANSPARENT
    navigationBarColor = android.graphics.Color.TRANSPARENT
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
        isStatusBarContrastEnforced = false
        isNavigationBarContrastEnforced = false
    }
}

@Composable
internal fun AnimatedVisibilityScope.fadeWithShadow(enterMillis: Int, exitMillis: Int): Modifier {
    val alpha by transition.animateFloat(
        transitionSpec = { tween(if (targetState == EnterExitState.Visible) enterMillis else exitMillis) },
        label = "alpha",
    ) { if (it == EnterExitState.Visible) 1f else 0f }
    return Modifier.graphicsLayer {
        this.alpha = alpha
        compositingStrategy = CompositingStrategy.ModulateAlpha
    }
}

@Composable
internal fun Scrim(
    transition: MutableTransitionState<Boolean>,
    enterMillis: Int,
    exitMillis: Int,
    onClick: (() -> Unit)?,
) {
    val color = EsuissTheme.colors.scrim
    val click by rememberUpdatedState(onClick)
    AnimatedVisibility(
        visibleState = transition,
        enter = fadeIn(tween(enterMillis)),
        exit = fadeOut(tween(exitMillis)),
    ) {
        Box(
            modifier = Modifier
                .fillMaxSize()
                .background(color)
                .pointerInput(Unit) { detectTapGestures { click?.invoke() } },
        )
    }
}

@Stable
internal class PaneTitleState {
    var value by mutableStateOf<String?>(null)
}

internal val LocalPaneTitle = staticCompositionLocalOf<PaneTitleState?> { null }

@Composable
internal fun RegisterPaneTitle(text: String) {
    val state = LocalPaneTitle.current
    SideEffect { state?.value = text }
}

internal fun Modifier.raisedSurface(colors: Colors, shape: Shape, shadow: Shadow = Shadows.lg): Modifier =
    this
        .shadow(shadow, shape)
        .clip(shape)
        .background(colors.surfaceRaised, shape)
        .border(1.dp, colors.label.copy(alpha = if (colors.isDark) 0.1f else 0.05f), shape)

internal fun titleStyle(colors: Colors, style: TextStyle = Typography.base, centered: Boolean = false): TextStyle =
    style.copy(
        color = colors.label,
        fontWeight = FontWeight.SemiBold,
        textAlign = if (centered) TextAlign.Center else TextAlign.Unspecified,
    )

internal fun descriptionStyle(colors: Colors, centered: Boolean = false): TextStyle =
    Typography.sm.copy(
        color = colors.labelSecondary,
        textAlign = if (centered) TextAlign.Center else TextAlign.Unspecified,
    )

@Composable
internal fun OverlayTitle(text: String, modifier: Modifier, style: TextStyle) {
    RegisterPaneTitle(text)
    BasicText(text, modifier = modifier.semantics { heading() }, style = style)
}

@Composable
internal fun OverlayCloseButton(
    onClick: () -> Unit,
    label: String?,
    modifier: Modifier = Modifier,
) {
    val colors = EsuissTheme.colors
    if (label != null) {
        Button(onClick = onClick, modifier = modifier, variant = ButtonVariant.Plain, size = ButtonSize.Sm) {
            BasicText(label, style = Typography.base.copy(color = LocalContentColor.current), maxLines = 1)
        }
        return
    }
    val interaction = remember { MutableInteractionSource() }
    val pressed by interaction.collectIsPressedAsState()
    Box(
        modifier = modifier
            .size(44.dp)
            .clip(CircleShape)
            .clickable(interactionSource = interaction, indication = null, role = Role.Button, onClick = onClick)
            .semantics { contentDescription = "Close" },
        contentAlignment = Alignment.Center,
    ) {
        Box(
            modifier = Modifier
                .size(32.dp)
                .background(if (pressed) colors.separator else colors.surfaceTertiary, CircleShape),
            contentAlignment = Alignment.Center,
        ) {
            Icon(PhosphorIcons.Regular.X, contentDescription = null, size = 16.dp, tint = colors.label)
        }
    }
}

@Composable
internal fun rememberLongPressModifier(enabled: Boolean, onLongPress: (Offset) -> Unit): Modifier {
    val callback by rememberUpdatedState(onLongPress)
    if (!enabled) return Modifier
    return Modifier.pointerInput(Unit) {
        awaitEachGesture {
            val down = awaitFirstDown(requireUnconsumed = false, pass = PointerEventPass.Initial)
            val released = withTimeoutOrNull(viewConfiguration.longPressTimeoutMillis) {
                while (true) {
                    val event = awaitPointerEvent(PointerEventPass.Initial)
                    val change = event.changes.firstOrNull { it.id == down.id }
                    if (change == null || !change.pressed) break
                    if ((change.position - down.position).getDistance() > viewConfiguration.touchSlop) break
                }
                true
            }
            if (released == null) {
                callback(down.position)
                while (true) {
                    val event = awaitPointerEvent(PointerEventPass.Initial)
                    event.changes.forEach { it.consume() }
                    if (event.changes.none { it.pressed }) break
                }
            }
        }
    }
}
```

```kt title="kotlin/components/Screen.kt"
package com.esuiss.ui.components

import android.app.Activity
import android.content.Context
import android.content.ContextWrapper
import android.os.Build
import android.view.View
import android.view.Window
import android.view.WindowInsetsController
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.BoxScope
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.ExperimentalLayoutApi
import androidx.compose.foundation.layout.ColumnScope
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.WindowInsets
import androidx.compose.foundation.layout.WindowInsetsSides
import androidx.compose.foundation.layout.displayCutout
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.only
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.statusBarsIgnoringVisibility
import androidx.compose.foundation.layout.systemBars
import androidx.compose.foundation.layout.union
import androidx.compose.foundation.layout.windowInsetsPadding
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.verticalScroll
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.SideEffect
import androidx.compose.runtime.Stable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalView
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography

@Stable
internal class KeyboardAccessoryInset {
    var height by mutableIntStateOf(0)
}

internal val LocalKeyboardAccessory = staticCompositionLocalOf<KeyboardAccessoryInset?> { null }

enum class ScreenEdge { Top, Bottom, Left, Right }

enum class ScreenVariant { Default, Secondary }

private val AllScreenEdges = setOf(ScreenEdge.Top, ScreenEdge.Bottom, ScreenEdge.Left, ScreenEdge.Right)

private fun Set<ScreenEdge>.sides(): WindowInsetsSides? = map {
    when (it) {
        ScreenEdge.Top -> WindowInsetsSides.Top
        ScreenEdge.Bottom -> WindowInsetsSides.Bottom
        ScreenEdge.Left -> WindowInsetsSides.Left
        ScreenEdge.Right -> WindowInsetsSides.Right
    }
}.reduceOrNull { sides, side -> sides + side }

internal tailrec fun Context.findActivity(): Activity? = when (this) {
    is Activity -> this
    is ContextWrapper -> baseContext.findActivity()
    else -> null
}

@Suppress("DEPRECATION")
private fun Window.applyLightBars(light: Boolean) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
        val mask = WindowInsetsController.APPEARANCE_LIGHT_STATUS_BARS or WindowInsetsController.APPEARANCE_LIGHT_NAVIGATION_BARS
        insetsController?.setSystemBarsAppearance(if (light) mask else 0, mask)
        return
    }
    var flags = decorView.systemUiVisibility
    flags = if (light) flags or View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR else flags and View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR.inv()
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        flags = if (light) flags or View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR else flags and View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR.inv()
    }
    if (decorView.systemUiVisibility != flags) decorView.systemUiVisibility = flags
}

@OptIn(ExperimentalLayoutApi::class)
@Composable
fun Screen(
    modifier: Modifier = Modifier,
    edges: Set<ScreenEdge> = AllScreenEdges,
    variant: ScreenVariant = ScreenVariant.Default,
    content: @Composable BoxScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val view = LocalView.current
    val light = !colors.isDark
    SideEffect {
        if (!view.isInEditMode) view.context.findActivity()?.window?.applyLightBars(light)
    }
    val sides = edges.sides()
    val accessory = remember { KeyboardAccessoryInset() }
    val fill = when (variant) {
        ScreenVariant.Default -> colors.surface
        ScreenVariant.Secondary -> colors.surfaceSecondary
    }
    Box(
        modifier = modifier
            .fillMaxSize()
            .background(fill)
            .then(
                if (sides != null) {
                    Modifier.windowInsetsPadding(WindowInsets.systemBars.union(WindowInsets.displayCutout).union(WindowInsets.statusBarsIgnoringVisibility).only(sides))
                } else {
                    Modifier
                },
            ),
    ) {
        CompositionLocalProvider(
            LocalKeyboardAccessory provides accessory,
            LocalContentStyle provides Typography.base.copy(color = colors.label),
            LocalContentColor provides colors.label,
        ) {
            content()
        }
    }
}

@Composable
fun ScreenContent(
    modifier: Modifier = Modifier,
    scrollable: Boolean = false,
    contentPadding: PaddingValues = PaddingValues(16.dp),
    verticalArrangement: Arrangement.Vertical = Arrangement.spacedBy(16.dp),
    content: @Composable ColumnScope.() -> Unit,
) {
    Column(
        modifier = modifier
            .fillMaxWidth()
            .then(if (scrollable) Modifier.verticalScroll(rememberScrollState()) else Modifier)
            .padding(contentPadding),
        verticalArrangement = verticalArrangement,
        content = content,
    )
}
```

```kt title="kotlin/components/Select.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.clickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsPressedAsState
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.ColumnScope
import androidx.compose.foundation.layout.IntrinsicSize
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.heightIn
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.selection.selectable
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.foundation.verticalScroll
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.DisposableEffect
import androidx.compose.runtime.Immutable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateMapOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.runtime.snapshots.SnapshotStateMap
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.layout.Layout
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.heading
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.semantics.stateDescription
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.max
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.CaretUpDown
import com.adamglin.phosphoricons.regular.Check
import com.esuiss.ui.theme.Colors
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

enum class SelectSize(val height: Dp, val radius: Dp) {
    Default(44.dp, Radius.lg),
    Sm(36.dp, Radius.md),
}

@Immutable
class SelectOption(val value: String, val label: String, val enabled: Boolean = true)

@Immutable
private data class SelectContext(val value: String?, val onSelect: (String) -> Unit)

private val LocalSelect = staticCompositionLocalOf { SelectContext(null) {} }

private val LocalSelectLabels = staticCompositionLocalOf<SnapshotStateMap<String, String>?> { null }

internal fun controlBackground(colors: Colors, invalid: Boolean, enabled: Boolean): Color = when {
    !enabled -> colors.controlDisabled
    invalid -> colors.danger.copy(alpha = if (colors.isDark) 0.1f else 0.05f)
    else -> colors.control
}

@Composable
fun Select(
    value: String?,
    onValueChange: (String) -> Unit,
    options: List<SelectOption>,
    modifier: Modifier = Modifier,
    placeholder: String = "",
    size: SelectSize = SelectSize.Default,
    invalid: Boolean? = null,
    enabled: Boolean = true,
    side: PopupSide = PopupSide.Bottom,
    align: PopupAlign = PopupAlign.Center,
    sideOffset: Dp = 4.dp,
) {
    Select(
        value = value,
        onValueChange = onValueChange,
        displayValue = options.firstOrNull { it.value == value }?.label,
        modifier = modifier,
        placeholder = placeholder,
        size = size,
        invalid = invalid,
        enabled = enabled,
        side = side,
        align = align,
        sideOffset = sideOffset,
    ) {
        SelectGroup {
            options.forEach { SelectItem(it.value, it.label, enabled = it.enabled) }
        }
    }
}

@Composable
fun Select(
    value: String?,
    onValueChange: (String) -> Unit,
    displayValue: String?,
    modifier: Modifier = Modifier,
    placeholder: String = "",
    size: SelectSize = SelectSize.Default,
    invalid: Boolean? = null,
    enabled: Boolean = true,
    side: PopupSide = PopupSide.Bottom,
    align: PopupAlign = PopupAlign.Center,
    sideOffset: Dp = 4.dp,
    content: @Composable ColumnScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val field = LocalFieldState.current
    val isInvalid = invalid ?: field.invalid
    val isEnabled = enabled && field.enabled
    var expanded by remember { mutableStateOf(false) }
    val item = rememberButtonGroupItem(LocalButtonGroup.current, RoundedCornerShape(size.radius))
    val shape = item.shape
    val labels = remember { mutableStateMapOf<String, String>() }
    val text = displayValue ?: value?.let { labels[it] ?: it }
    val foreground = when {
        !isEnabled -> colors.labelQuaternary
        text == null -> colors.labelSecondary
        else -> colors.label
    }
    Box(modifier = modifier.then(item.modifier), propagateMinConstraints = true) {
        if (displayValue == null) {
            Layout(
                content = {
                    CompositionLocalProvider(LocalSelectLabels provides labels) { Column(content = content) }
                },
            ) { _, _ -> layout(0, 0) {} }
        }
        Row(
            modifier = Modifier
                .width(IntrinsicSize.Max)
                .height(size.height)
                .clip(shape)
                .background(controlBackground(colors, isInvalid, isEnabled), shape)
                .border(1.dp, if (isInvalid) colors.danger else Color.Transparent, shape)
                .semantics { stateDescription = if (expanded) "Expanded" else "Collapsed" }
                .clickable(
                    interactionSource = remember { MutableInteractionSource() },
                    indication = null,
                    enabled = isEnabled,
                    role = Role.DropdownList,
                    onClick = { expanded = !expanded },
                )
                .padding(horizontal = 12.dp),
            horizontalArrangement = Arrangement.spacedBy(6.dp),
            verticalAlignment = Alignment.CenterVertically,
        ) {
            BasicText(
                text ?: placeholder,
                modifier = Modifier.weight(1f),
                style = Typography.base.copy(color = foreground),
                maxLines = 1,
                overflow = TextOverflow.Ellipsis,
            )
            Icon(PhosphorIcons.Regular.CaretUpDown, contentDescription = null, size = 16.dp, tint = colors.labelSecondary)
        }
        AnchoredPopup(
            expanded = expanded,
            onDismissRequest = { expanded = false },
            side = side,
            align = align,
            sideOffset = sideOffset,
        ) { placement ->
            val anchorWidth = with(LocalDensity.current) { placement.anchorWidth.toDp() }
            CompositionLocalProvider(
                LocalSelect provides SelectContext(value) {
                    onValueChange(it)
                    expanded = false
                },
                LocalContentStyle provides Typography.base.copy(color = colors.label),
                LocalContentColor provides colors.label,
            ) {
                Column(
                    modifier = Modifier
                        .width(max(anchorWidth, 144.dp))
                        .raisedSurface(colors, RoundedCornerShape(Radius.xl))
                        .verticalScroll(rememberScrollState()),
                    content = content,
                )
            }
        }
    }
}

@Composable
fun SelectGroup(
    modifier: Modifier = Modifier,
    content: @Composable ColumnScope.() -> Unit,
) {
    Column(modifier = modifier.fillMaxWidth().padding(6.dp), content = content)
}

@Composable
fun SelectLabel(text: String, modifier: Modifier = Modifier) {
    BasicText(
        text,
        modifier = modifier
            .fillMaxWidth()
            .semantics { heading() }
            .padding(horizontal = 12.dp, vertical = 10.dp),
        style = Typography.xs.copy(color = EsuissTheme.colors.labelSecondary, fontWeight = FontWeight.SemiBold),
    )
}

@Composable
fun SelectItem(
    value: String,
    text: String,
    modifier: Modifier = Modifier,
    enabled: Boolean = true,
) {
    val labels = LocalSelectLabels.current
    if (labels != null) {
        DisposableEffect(labels, value, text) {
            labels[value] = text
            onDispose { labels.remove(value) }
        }
        return
    }
    val colors = EsuissTheme.colors
    val select = LocalSelect.current
    val selected = select.value == value
    val interaction = remember { MutableInteractionSource() }
    val pressed by interaction.collectIsPressedAsState()
    val shape = RoundedCornerShape(Radius.md)
    Box(
        modifier = modifier
            .fillMaxWidth()
            .heightIn(min = 44.dp)
            .clip(shape)
            .background(if (pressed && enabled) colors.itemPressed else Color.Transparent, shape)
            .selectable(
                selected = selected,
                interactionSource = interaction,
                indication = null,
                enabled = enabled,
                role = Role.RadioButton,
                onClick = { select.onSelect(value) },
            )
            .padding(start = 12.dp, end = 8.dp),
        contentAlignment = Alignment.CenterStart,
    ) {
        BasicText(
            text,
            modifier = Modifier.padding(end = 24.dp, top = 8.dp, bottom = 8.dp),
            style = Typography.base.copy(color = if (enabled) colors.label else colors.labelQuaternary),
            maxLines = 1,
            overflow = TextOverflow.Ellipsis,
        )
        if (selected) {
            Icon(
                PhosphorIcons.Regular.Check,
                contentDescription = null,
                modifier = Modifier.align(Alignment.CenterEnd),
                size = 16.dp,
                tint = colors.link,
            )
        }
    }
}

@Composable
fun SelectSeparator(modifier: Modifier = Modifier) {
    Box(
        modifier = modifier
            .padding(vertical = 6.dp)
            .fillMaxWidth()
            .height(1.dp)
            .background(EsuissTheme.colors.separator),
    )
}
```

```kt title="kotlin/components/Separator.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.background
import androidx.compose.foundation.gestures.Orientation
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxHeight
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.width
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme

@Composable
fun Separator(
    modifier: Modifier = Modifier,
    orientation: Orientation = Orientation.Horizontal,
) {
    val sizing = if (orientation == Orientation.Horizontal) {
        Modifier.fillMaxWidth().height(1.dp)
    } else {
        Modifier.fillMaxHeight().width(1.dp)
    }
    Box(modifier.then(sizing).background(EsuissTheme.colors.separator))
}
```

```kt title="kotlin/components/Switch.kt"
package com.esuiss.ui.components

import androidx.compose.animation.core.animateDpAsState
import androidx.compose.animation.core.tween
import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsPressedAsState
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.offset
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.selection.toggleable
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.error
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.shadow

enum class SwitchSize(
    internal val width: Dp,
    internal val height: Dp,
    internal val thumbHeight: Dp,
    internal val thumbWidth: Dp,
    internal val pressedThumbWidth: Dp,
    internal val travel: Dp,
    internal val pressedTravel: Dp,
) {
    Default(52.dp, 24.dp, 20.dp, 32.dp, 36.dp, 16.dp, 12.dp),
    Sm(44.dp, 20.dp, 16.dp, 26.dp, 30.dp, 14.dp, 10.dp),
}

@Composable
fun Switch(
    checked: Boolean,
    onCheckedChange: ((Boolean) -> Unit)?,
    modifier: Modifier = Modifier,
    size: SwitchSize = SwitchSize.Default,
    enabled: Boolean = LocalFieldState.current.enabled,
    invalid: Boolean = LocalFieldState.current.invalid,
    interactionSource: MutableInteractionSource? = null,
) {
    val colors = EsuissTheme.colors
    val haptics = rememberHaptics()
    val source = interactionSource ?: remember { MutableInteractionSource() }
    val pressed by source.collectIsPressedAsState()
    val squeezed = pressed && enabled && onCheckedChange != null
    val spec = tween<Dp>(200, easing = FormEasing)
    val thumbWidth by animateDpAsState(if (squeezed) size.pressedThumbWidth else size.thumbWidth, spec, label = "thumb")
    val travel by animateDpAsState(
        when {
            !checked -> 0.dp
            squeezed -> size.pressedTravel
            else -> size.travel
        },
        spec,
        label = "travel",
    )
    val track = when {
        checked && !enabled -> colors.accentDisabled
        checked -> colors.accent
        !enabled -> colors.controlDisabled
        else -> colors.labelQuaternary
    }
    val border = when {
        invalid && enabled -> colors.danger
        checked && enabled -> colors.accent
        else -> Color.Transparent
    }
    val toggle = if (onCheckedChange != null) {
        Modifier
            .toggleable(
                value = checked,
                interactionSource = source,
                indication = null,
                enabled = enabled,
                role = Role.Switch,
                onValueChange = {
                    haptics.toggle(it)
                    onCheckedChange(it)
                },
            )
            .formTouchTarget()
    } else {
        Modifier
    }
    Box(
        modifier = modifier
            .then(toggle)
            .then(if (invalid) Modifier.semantics { error("Invalid") } else Modifier)
            .size(size.width, size.height)
            .background(track, CircleShape)
            .border(2.dp, border, CircleShape)
            .padding(2.dp),
        contentAlignment = Alignment.CenterStart,
    ) {
        Box(
            Modifier
                .offset(x = travel)
                .size(thumbWidth, size.thumbHeight)
                .shadow(FormShadowSm, CircleShape)
                .background(if (colors.isDark) colors.label else colors.surface, CircleShape),
        )
    }
}
```

```kt title="kotlin/components/Toggle.kt"
package com.esuiss.ui.components

import androidx.compose.animation.core.animateFloatAsState
import androidx.compose.animation.core.tween
import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsPressedAsState
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.layout.defaultMinSize
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.selection.selectable
import androidx.compose.foundation.selection.toggleable
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.getValue
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.Shape
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.Colors
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

enum class ToggleVariant { Default, Outline }

enum class ToggleSize(internal val height: Dp, internal val horizontalPadding: Dp) {
    Default(36.dp, 12.dp),
    Sm(32.dp, 12.dp),
    Lg(40.dp, 16.dp),
}

@Composable
fun Toggle(
    pressed: Boolean,
    onPressedChange: (Boolean) -> Unit,
    modifier: Modifier = Modifier,
    variant: ToggleVariant = ToggleVariant.Default,
    size: ToggleSize = ToggleSize.Default,
    enabled: Boolean = true,
    interactionSource: MutableInteractionSource? = null,
    content: @Composable RowScope.() -> Unit,
) {
    val source = interactionSource ?: remember { MutableInteractionSource() }
    val touching by source.collectIsPressedAsState()
    val colors = EsuissTheme.colors
    val haptics = rememberHaptics()
    ToggleSurface(
        modifier = modifier.toggleSemantics(pressed, enabled, source, multiple = true) {
            haptics.toggle(!pressed)
            onPressedChange(!pressed)
        },
        size = size,
        shape = RoundedCornerShape(Radius.lg),
        outlined = variant == ToggleVariant.Outline,
        background = toggleBackground(colors, pressed, enabled, touching),
        foreground = toggleForeground(colors, pressed, enabled),
        scaled = touching && enabled,
        content = content,
    )
}

@Composable
fun Toggle(
    text: String,
    pressed: Boolean,
    onPressedChange: (Boolean) -> Unit,
    modifier: Modifier = Modifier,
    variant: ToggleVariant = ToggleVariant.Default,
    size: ToggleSize = ToggleSize.Default,
    enabled: Boolean = true,
) {
    Toggle(pressed, onPressedChange, modifier, variant, size, enabled) {
        BasicText(text, style = LocalContentStyle.current, maxLines = 1)
    }
}

internal fun toggleBackground(colors: Colors, on: Boolean, enabled: Boolean, touching: Boolean): Color = when {
    !enabled -> if (on) colors.controlDisabled else Color.Transparent
    on -> if (touching) colors.itemPressed else colors.itemSelected
    touching -> colors.itemPressed
    else -> Color.Transparent
}

internal fun toggleForeground(colors: Colors, on: Boolean, enabled: Boolean): Color = when {
    !enabled -> colors.labelQuaternary
    on -> colors.link
    else -> colors.label
}

@Composable
internal fun ToggleSurface(
    modifier: Modifier,
    size: ToggleSize,
    shape: Shape,
    outlined: Boolean,
    background: Color,
    foreground: Color,
    scaled: Boolean,
    horizontalPadding: Dp = size.horizontalPadding,
    content: @Composable RowScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val scale by animateFloatAsState(if (scaled) 0.96f else 1f, tween(150), label = "toggle")
    Row(
        modifier = modifier
            .graphicsLayer {
                scaleX = scale
                scaleY = scale
            }
            .height(size.height)
            .defaultMinSize(minWidth = size.height)
            .clip(shape)
            .background(background, shape)
            .then(if (outlined) Modifier.border(1.dp, colors.separator, shape) else Modifier)
            .padding(horizontal = horizontalPadding),
        horizontalArrangement = Arrangement.spacedBy(4.dp, Alignment.CenterHorizontally),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        CompositionLocalProvider(
            LocalContentStyle provides Typography.sm.copy(color = foreground),
            LocalContentColor provides foreground,
            LocalIconSize provides 16.dp,
        ) {
            content()
        }
    }
}

internal fun Modifier.toggleSemantics(
    on: Boolean,
    enabled: Boolean,
    source: MutableInteractionSource,
    multiple: Boolean,
    onClick: () -> Unit,
): Modifier = if (multiple) {
    toggleable(
        value = on,
        interactionSource = source,
        indication = null,
        enabled = enabled,
        role = Role.Checkbox,
        onValueChange = { onClick() },
    )
} else {
    selectable(
        selected = on,
        interactionSource = source,
        indication = null,
        enabled = enabled,
        role = Role.RadioButton,
        onClick = onClick,
    )
}
```

```kt title="kotlin/components/ToggleGroup.kt"
package com.esuiss.ui.components

import androidx.compose.animation.core.Animatable
import androidx.compose.animation.core.CubicBezierEasing
import androidx.compose.animation.core.tween
import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.gestures.Orientation
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsPressedAsState
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.IntrinsicSize
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.offset
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.selection.selectableGroup
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.DisposableEffect
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.SideEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateMapOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.geometry.Rect
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.RectangleShape
import androidx.compose.ui.layout.boundsInParent
import androidx.compose.ui.layout.onPlaced
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.IntOffset
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.shadow
import kotlin.math.roundToInt
import kotlinx.coroutines.launch

private val IndicatorEasing = CubicBezierEasing(0.32f, 0.72f, 0f, 1f)

private class ToggleGroupIndicator {
    val bounds = mutableStateMapOf<String, Rect>()
    val active = mutableStateMapOf<String, Boolean>()
}

private class ToggleGroupState(
    val isSelected: (String) -> Boolean,
    val toggle: (String) -> Unit,
    val variant: ToggleVariant,
    val size: ToggleSize,
    val spacing: Int,
    val orientation: Orientation,
    val enabled: Boolean,
    val multiple: Boolean,
    val selected: String? = null,
    val indicator: ToggleGroupIndicator? = null,
) {
    val segmented: Boolean get() = spacing == 0 && variant == ToggleVariant.Default
    val attached: Boolean get() = spacing == 0 && variant == ToggleVariant.Outline
}

private val LocalToggleGroupState = staticCompositionLocalOf<ToggleGroupState?> { null }

@Composable
fun ToggleGroup(
    value: String?,
    onValueChange: (String?) -> Unit,
    modifier: Modifier = Modifier,
    variant: ToggleVariant = ToggleVariant.Default,
    size: ToggleSize = ToggleSize.Default,
    spacing: Int = 2,
    orientation: Orientation = Orientation.Horizontal,
    enabled: Boolean = true,
    content: @Composable () -> Unit,
) {
    val indicator = remember { ToggleGroupIndicator() }
    val state = ToggleGroupState(
        isSelected = { it == value },
        toggle = { onValueChange(if (it == value) null else it) },
        variant = variant,
        size = size,
        spacing = spacing,
        orientation = orientation,
        enabled = enabled,
        multiple = false,
        selected = value,
        indicator = if (spacing == 0 && variant == ToggleVariant.Default) indicator else null,
    )
    ToggleGroupLayout(state, modifier, content)
}

@Composable
fun ToggleGroup(
    values: Set<String>,
    onValuesChange: (Set<String>) -> Unit,
    modifier: Modifier = Modifier,
    variant: ToggleVariant = ToggleVariant.Default,
    size: ToggleSize = ToggleSize.Default,
    spacing: Int = 2,
    orientation: Orientation = Orientation.Horizontal,
    enabled: Boolean = true,
    content: @Composable () -> Unit,
) {
    val state = ToggleGroupState(
        isSelected = { it in values },
        toggle = { onValuesChange(if (it in values) values - it else values + it) },
        variant = variant,
        size = size,
        spacing = spacing,
        orientation = orientation,
        enabled = enabled,
        multiple = true,
    )
    ToggleGroupLayout(state, modifier, content)
}

@Composable
private fun ToggleGroupLayout(
    state: ToggleGroupState,
    modifier: Modifier,
    content: @Composable () -> Unit,
) {
    val colors = EsuissTheme.colors
    val vertical = state.orientation == Orientation.Vertical
    val base = modifier.then(if (state.multiple) Modifier else Modifier.selectableGroup())
    CompositionLocalProvider(LocalToggleGroupState provides state) {
        if (state.attached) {
            val shape = RoundedCornerShape(if (vertical) Radius.xl else Radius.lg)
            FormDividedStack(
                orientation = state.orientation,
                dividerColor = colors.separator,
                modifier = base.clip(shape).border(1.dp, colors.separator, shape),
                content = content,
            )
        } else {
            val gap = if (state.segmented) 4.dp else (state.spacing * 4).dp
            val container = if (state.segmented) {
                val shape = RoundedCornerShape(Radius.xl)
                base.clip(shape).background(colors.control, shape).padding(4.dp)
            } else {
                base
            }
            val indicator = state.indicator
            if (indicator != null) {
                Box(modifier = if (vertical) container.width(IntrinsicSize.Max) else container) {
                    if (state.enabled) ToggleGroupIndicatorLayer(indicator, state.selected)
                    ToggleGroupStack(vertical, gap, if (vertical) Modifier.fillMaxWidth() else Modifier, content)
                }
            } else {
                ToggleGroupStack(vertical, gap, if (vertical) container.width(IntrinsicSize.Max) else container, content)
            }
        }
    }
}

@Composable
private fun ToggleGroupStack(
    vertical: Boolean,
    gap: Dp,
    modifier: Modifier,
    content: @Composable () -> Unit,
) {
    if (vertical) {
        Column(
            modifier = modifier,
            verticalArrangement = Arrangement.spacedBy(gap),
        ) {
            content()
        }
    } else {
        Row(
            modifier = modifier,
            horizontalArrangement = Arrangement.spacedBy(gap),
            verticalAlignment = Alignment.CenterVertically,
        ) {
            content()
        }
    }
}

@Composable
private fun ToggleGroupIndicatorLayer(indicator: ToggleGroupIndicator, selected: String?) {
    val colors = EsuissTheme.colors
    val density = LocalDensity.current
    val reduced = formReducedMotion()
    val target = selected?.takeIf { indicator.active[it] != false }?.let { indicator.bounds[it] } ?: return
    val left = remember { Animatable(target.left) }
    val top = remember { Animatable(target.top) }
    val width = remember { Animatable(target.width) }
    val height = remember { Animatable(target.height) }
    LaunchedEffect(target) {
        if (reduced) {
            left.snapTo(target.left)
            top.snapTo(target.top)
            width.snapTo(target.width)
            height.snapTo(target.height)
        } else {
            val spec = tween<Float>(300, easing = IndicatorEasing)
            launch { left.animateTo(target.left, spec) }
            launch { top.animateTo(target.top, spec) }
            launch { width.animateTo(target.width, spec) }
            launch { height.animateTo(target.height, spec) }
        }
    }
    val shape = RoundedCornerShape(Radius.md)
    Box(
        modifier = Modifier
            .offset { IntOffset(left.value.roundToInt(), top.value.roundToInt()) }
            .size(with(density) { width.value.toDp() }, with(density) { height.value.toDp() })
            .shadow(FormShadowSm, shape)
            .background(if (colors.isDark) colors.labelQuaternary else colors.surfaceRaised, shape),
    )
}

@Composable
fun ToggleGroupItem(
    value: String,
    modifier: Modifier = Modifier,
    enabled: Boolean = true,
    interactionSource: MutableInteractionSource? = null,
    content: @Composable RowScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val group = LocalToggleGroupState.current ?: return
    val source = interactionSource ?: remember { MutableInteractionSource() }
    val touching by source.collectIsPressedAsState()
    val haptics = rememberHaptics()
    val on = group.isSelected(value)
    val active = enabled && group.enabled
    val fill = if (group.orientation == Orientation.Vertical) Modifier.fillMaxWidth() else Modifier
    val semantics = modifier
        .then(fill)
        .toggleSemantics(on, active, source, group.multiple) {
            if (group.multiple) haptics.toggle(!on) else haptics.selection()
            group.toggle(value)
        }
    val indicator = group.indicator
    if (indicator != null) {
        SideEffect { indicator.active[value] = active }
        DisposableEffect(indicator, value) {
            onDispose {
                indicator.bounds.remove(value)
                indicator.active.remove(value)
            }
        }
    }
    val sliding = indicator != null && on && active
    when {
        group.segmented -> {
            val shape = RoundedCornerShape(Radius.md)
            val background = when {
                !on || sliding -> Color.Transparent
                !active -> colors.controlDisabled
                colors.isDark -> colors.labelQuaternary
                else -> colors.surfaceRaised
            }
            val foreground = when {
                !active -> colors.labelQuaternary
                on -> colors.label
                else -> colors.labelSecondary
            }
            val placed = if (indicator != null) {
                semantics.onPlaced { indicator.bounds[value] = it.boundsInParent() }
            } else {
                semantics
            }
            ToggleSurface(
                modifier = placed.then(if (on && active && !sliding) Modifier.shadow(FormShadowSm, shape) else Modifier),
                size = group.size,
                shape = shape,
                outlined = false,
                background = background,
                foreground = foreground,
                scaled = false,
                horizontalPadding = 12.dp,
                content = content,
            )
        }
        else -> ToggleSurface(
            modifier = semantics,
            size = group.size,
            shape = if (group.attached) RectangleShape else RoundedCornerShape(Radius.lg),
            outlined = !group.attached && group.variant == ToggleVariant.Outline,
            background = toggleBackground(colors, on, active, touching),
            foreground = toggleForeground(colors, on, active),
            scaled = touching && active,
            content = content,
        )
    }
}

@Composable
fun ToggleGroupItem(
    text: String,
    value: String,
    modifier: Modifier = Modifier,
    enabled: Boolean = true,
) {
    ToggleGroupItem(value, modifier, enabled) {
        BasicText(text, style = LocalContentStyle.current, maxLines = 1)
    }
}
```

```kt title="kotlin/patterns/Picker.kt"
package com.esuiss.ui.patterns

import androidx.compose.foundation.layout.ColumnScope
import androidx.compose.runtime.Composable
import androidx.compose.runtime.Immutable
import androidx.compose.ui.Modifier
import com.esuiss.ui.components.Select
import com.esuiss.ui.components.SelectGroup
import com.esuiss.ui.components.SelectItem
import com.esuiss.ui.components.SelectLabel
import com.esuiss.ui.components.SelectSeparator
import com.esuiss.ui.components.SelectSize

@Immutable
class PickerItemData(
    val value: String,
    val label: String,
    val enabled: Boolean = true,
)

@Composable
fun Picker(
    value: String?,
    onValueChange: (String) -> Unit,
    modifier: Modifier = Modifier,
    items: List<PickerItemData> = emptyList(),
    placeholder: String = "",
    size: SelectSize = SelectSize.Default,
    enabled: Boolean = true,
    invalid: Boolean? = null,
    content: (@Composable ColumnScope.() -> Unit)? = null,
) {
    Select(
        value = value,
        onValueChange = onValueChange,
        displayValue = items.firstOrNull { it.value == value }?.label,
        modifier = modifier,
        placeholder = placeholder,
        size = size,
        invalid = invalid,
        enabled = enabled,
    ) {
        if (content != null) {
            content()
        } else {
            SelectGroup {
                items.forEach { PickerItem(it.value, it.label, enabled = it.enabled) }
            }
        }
    }
}

@Composable
fun PickerGroup(
    label: String? = null,
    modifier: Modifier = Modifier,
    content: @Composable ColumnScope.() -> Unit,
) {
    SelectGroup(modifier) {
        if (label != null) SelectLabel(label)
        content()
    }
}

@Composable
fun PickerItem(
    value: String,
    text: String,
    modifier: Modifier = Modifier,
    enabled: Boolean = true,
) {
    SelectItem(value, text, modifier, enabled)
}

@Composable
fun PickerSeparator() {
    SelectSeparator()
}
```

4. Update the `com.esuiss.ui` package names to match your project.

## Usage

```tsx
import { SettingsNotifications } from "@/components/blocks/settings-notifications"
```

```tsx
<SettingsNotifications />
```

The settings live in local state and the component takes no props. Replace `WALLPAPER`, `PREVIEW_OPTIONS` and `GROUPING_OPTIONS` and wire each control's change handler to your preferences store.