# Inbox Support

A support ticket inbox with Open, Pending, Solved and All queues, a ticket view and a reply box.

Inbox Support 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/inbox-support

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

```tsx title="uniwind/components/blocks/inbox-support.tsx"
import { cn } from "cn"
import {
  ChatCircleIcon,
  CheckIcon,
  type Icon as PhosphorIcon,
  TrayIcon,
} from "phosphor-react-native"
import * as React from "react"
import { useWindowDimensions, View } from "react-native"
import { FadeInDown, ReduceMotion } from "react-native-reanimated"
import {
  SplitView,
  type SplitViewColumn,
  SplitViewDetail,
  SplitViewItem,
  SplitViewList,
  SplitViewSidebar,
} from "@/components/patterns/split-view"
import { AnimatedView } from "@/components/ui/animated-view"
import { Avatar, AvatarFallback } from "@/components/ui/avatar"
import { Button } from "@/components/ui/button"
import { Icon } from "@/components/ui/icon"
import { Screen } from "@/components/ui/screen"
import { Text } from "@/components/ui/text"
import { Textarea } from "@/components/ui/textarea"
import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group"

type Status = "Open" | "Pending" | "Solved"

type Priority = "High" | "Medium" | "Low"

type Queue = Status | "All"

type Ticket = {
  id: string
  title: string
  device: string
  status: Status
  priority: Priority
  requester: string
  tint: string
}

const INITIAL_TICKETS: Ticket[] = [
  {
    id: "#4821",
    title: "Screen flickers",
    device: "Phone Pro",
    status: "Open",
    priority: "High",
    requester: "Jamie Rivera",
    tint: "bg-orange dark:bg-orange",
  },
  {
    id: "#4820",
    title: "Battery drains fast",
    device: "Book Air",
    status: "Pending",
    priority: "Medium",
    requester: "Morgan Lee",
    tint: "bg-cyan dark:bg-cyan",
  },
  {
    id: "#4819",
    title: "Pods won't pair",
    device: "Pods Studio",
    status: "Open",
    priority: "Low",
    requester: "Avery Brooks",
    tint: "bg-pink dark:bg-pink",
  },
  {
    id: "#4818",
    title: "Cloud backup error",
    device: "Phone Air",
    status: "Solved",
    priority: "Medium",
    requester: "Taylor Kim",
    tint: "bg-green dark:bg-green",
  },
]

const VIEWS: { value: Queue; icon: PhosphorIcon }[] = [
  { value: "Open", icon: ChatCircleIcon },
  { value: "Pending", icon: ChatCircleIcon },
  { value: "Solved", icon: CheckIcon },
  { value: "All", icon: TrayIcon },
]

const STATUSES: Status[] = ["Open", "Pending", "Solved"]

const PRIORITY_CLASS: Record<Priority, { box: string; text: string }> = {
  High: { box: "bg-danger-surface", text: "text-danger" },
  Medium: { box: "bg-warning-surface", text: "text-warning" },
  Low: { box: "bg-control", text: "text-label-secondary" },
}

const initials = (name: string) =>
  name
    .split(" ")
    .map((part) => part[0])
    .join("")

function Requester({
  ticket,
  size,
  className,
}: {
  ticket: Ticket
  size: "sm" | "default"
  className?: string
}) {
  return (
    <Avatar size={size} className={className}>
      <AvatarFallback className={ticket.tint}>
        {initials(ticket.requester)}
      </AvatarFallback>
    </Avatar>
  )
}

function TicketDetail({
  ticket,
  onStatusChange,
  onReply,
}: {
  ticket: Ticket
  onStatusChange: (status: Status) => void
  onReply: (text: string) => void
}) {
  const [reply, setReply] = React.useState("")

  return (
    <AnimatedView
      key={ticket.id}
      entering={FadeInDown.duration(800).reduceMotion(ReduceMotion.System)}
      className="gap-4"
    >
      <Text className="text-sm text-label-secondary">
        {`${ticket.id} · ${ticket.device}`}
      </Text>
      <ToggleGroup
        spacing={0}
        size="sm"
        value={[ticket.status]}
        onValueChange={(value) => {
          if (value[0]) onStatusChange(value[0] as Status)
        }}
        accessibilityLabel="Status"
      >
        {STATUSES.map((status) => (
          <ToggleGroupItem key={status} value={status}>
            <Text>{status}</Text>
          </ToggleGroupItem>
        ))}
      </ToggleGroup>
      <Text role="heading" className="text-3xl font-semibold">
        {ticket.title}
      </Text>
      <View className="flex-row items-center gap-2.5">
        <Requester ticket={ticket} size="default" className="size-8.5" />
        <View>
          <Text className="text-sm font-semibold">{ticket.requester}</Text>
          <Text className="text-xs text-label-secondary">Today 8:12 AM</Text>
        </View>
      </View>
      <View className="max-w-lg self-start rounded-2xl rounded-ss-sm bg-surface-secondary px-3.5 py-3">
        <Text className="text-base">
          Hi, this started right after the latest update. I tried restarting but
          it keeps happening. Can you help?
        </Text>
      </View>
      <View className="gap-2.5">
        <Textarea
          numberOfLines={3}
          value={reply}
          onChangeText={setReply}
          placeholder="Write a reply…"
          accessibilityLabel="Reply"
          className="min-h-20"
        />
        <View className="flex-row flex-wrap gap-2.5">
          <Button
            size="sm"
            disabled={!reply}
            onPress={() => {
              onReply(reply)
              setReply("")
              onStatusChange("Pending")
            }}
          >
            <Text>Send and set pending</Text>
          </Button>
          <Button
            size="sm"
            variant="outline"
            onPress={() => onStatusChange("Solved")}
          >
            <Text>Mark as solved</Text>
          </Button>
        </View>
      </View>
    </AnimatedView>
  )
}

function InboxSupport({
  onViewChange,
  onStatusChange,
  onReply,
}: {
  onViewChange?: (view: Status | "All") => void
  onStatusChange?: (id: string, status: Status) => void
  onReply?: (id: string, text: string) => void
}) {
  const { width } = useWindowDimensions()
  const wide = width >= 768
  const [tickets, setTickets] = React.useState(INITIAL_TICKETS)
  const [view, setView] = React.useState<Queue>("Open")
  const [selected, setSelected] = React.useState("#4821")
  const [column, setColumn] = React.useState<SplitViewColumn>("list")
  const list = tickets.filter(
    (ticket) => view === "All" || ticket.status === view
  )
  const current = tickets.find((ticket) => ticket.id === selected)

  const setStatus = (id: string, status: Status) => {
    onStatusChange?.(id, status)
    setTickets((items) =>
      items.map((ticket) => (ticket.id === id ? { ...ticket, status } : ticket))
    )
  }

  return (
    <Screen edges={["top", "right", "left"]}>
      <SplitView
        column={column}
        onColumnChange={setColumn}
        className={wide ? "m-4" : undefined}
      >
        <SplitViewSidebar
          title="Support"
          className={wide ? "min-h-full bg-surface-secondary" : "px-4 pb-8"}
        >
          {VIEWS.map((item) => (
            <SplitViewItem
              key={item.value}
              isActive={view === item.value}
              onPress={() => {
                setView(item.value)
                onViewChange?.(item.value)
              }}
              className={wide && view === item.value ? "bg-control" : undefined}
            >
              <View className="flex-row items-center gap-2.5">
                <Icon as={item.icon} className="size-5 text-accent" />
                <Text className="flex-1">{item.value}</Text>
                <Text className="text-xs text-label-secondary tabular-nums">
                  {String(
                    item.value === "All"
                      ? tickets.length
                      : tickets.filter((ticket) => ticket.status === item.value)
                          .length
                  )}
                </Text>
              </View>
            </SplitViewItem>
          ))}
        </SplitViewSidebar>
        <SplitViewList
          title={view}
          className={wide ? "gap-1 p-2" : "gap-1 px-4 pb-8"}
        >
          {list.map((ticket) => {
            const priority = PRIORITY_CLASS[ticket.priority]
            return (
              <SplitViewItem
                key={ticket.id}
                isActive={ticket.id === selected}
                onPress={() => setSelected(ticket.id)}
                className="py-3"
              >
                <View className="flex-row items-center gap-2">
                  <Text className="flex-1 text-xs text-label-secondary">
                    {`${ticket.id} · ${ticket.device}`}
                  </Text>
                  <View className={cn("rounded-md px-2 py-0.5", priority.box)}>
                    <Text
                      className={cn("text-2xs font-semibold", priority.text)}
                    >
                      {ticket.priority}
                    </Text>
                  </View>
                </View>
                <Text className="text-base font-semibold">{ticket.title}</Text>
                <View className="mt-1 flex-row items-center gap-1.5">
                  <Requester ticket={ticket} size="sm" className="size-5" />
                  <Text className="text-xs text-label-secondary">
                    {ticket.requester}
                  </Text>
                </View>
              </SplitViewItem>
            )
          })}
          {list.length === 0 ? (
            <Text className="p-6 text-center text-sm text-label-secondary">
              No tickets
            </Text>
          ) : null}
        </SplitViewList>
        <SplitViewDetail className={wide ? "p-5.5" : "px-4 pb-8"}>
          {current ? (
            <TicketDetail
              ticket={current}
              onStatusChange={(status) => setStatus(current.id, status)}
              onReply={(text) => onReply?.(current.id, text)}
            />
          ) : null}
        </SplitViewDetail>
      </SplitView>
    </Screen>
  )
}

export { InboxSupport }
```

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

public struct InboxSupport: View {
  public enum Status: String, CaseIterable, Sendable {
    case open = "Open"
    case pending = "Pending"
    case solved = "Solved"
  }

  enum Priority: String {
    case high = "High"
    case medium = "Medium"
    case low = "Low"
  }

  struct Ticket: Identifiable, Equatable {
    let id: String
    let title: String
    let device: String
    var status: Status
    let priority: Priority
    let requester: String
    let tint: Color
  }

  static var initialTickets: [Ticket] {
    [
      Ticket(id: "#4821", title: "Screen flickers", device: "Phone Pro", status: .open, priority: .high, requester: "Jamie Rivera", tint: .orange),
      Ticket(id: "#4820", title: "Battery drains fast", device: "Book Air", status: .pending, priority: .medium, requester: "Morgan Lee", tint: .blue),
      Ticket(id: "#4819", title: "Pods won't pair", device: "Pods Studio", status: .open, priority: .low, requester: "Avery Brooks", tint: .pink),
      Ticket(id: "#4818", title: "Cloud backup error", device: "Phone Air", status: .solved, priority: .medium, requester: "Taylor Kim", tint: .green),
    ]
  }

  static let views = ["Open", "Pending", "Solved", "All"]

  private var onViewChange: ((String) -> Void)?
  private var onReply: ((String, String) -> Void)?
  private var onStatusChange: ((String, Status) -> Void)?
  private let swiped: String?
  @State private var tickets: [Ticket]
  @State private var view: String
  @State private var selected: String
  @State private var reply: String
  @State private var column: SplitViewColumn
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  public init(
    onViewChange: ((_ view: String) -> Void)? = nil,
    onStatusChange: ((_ id: String, _ status: Status) -> Void)? = nil,
    onReply: ((_ id: String, _ text: String) -> Void)? = nil
  ) {
    self.init(view: "Open")
    self.onViewChange = onViewChange
    self.onReply = onReply
    self.onStatusChange = onStatusChange
  }

  init(
    view: String = "Open",
    selected: String = "#4821",
    reply: String = "",
    column: SplitViewColumn = .list,
    swiped: String? = nil
  ) {
    _tickets = State(initialValue: Self.initialTickets)
    _view = State(initialValue: view)
    _selected = State(initialValue: selected)
    _reply = State(initialValue: reply)
    _column = State(initialValue: column)
    self.swiped = swiped
  }

  private func count(_ value: String) -> Int {
    value == "All" ? tickets.count : tickets.filter { $0.status.rawValue == value }.count
  }

  public var body: some View {
    let list = tickets.filter { view == "All" || $0.status.rawValue == view }
    let current = tickets.first { $0.id == selected }
    Screen {
      SplitView(column: $column) {
        SplitViewSidebar("Support") {
          ForEach(Self.views, id: \.self) { item in
            SplitViewItem(isActive: view == item, action: {
              if view != item { onViewChange?(item) }
              view = item
            }) {
              HStack(spacing: 10) {
                (item == "Solved" ? Ph.check.regular : item == "All" ? Ph.tray.regular : Ph.chatCircle.regular)
                  .frame(width: 20, height: 20)
                  .foregroundStyle(Color.accent)
                Text(LocalizedStringKey(item))
                  .frame(maxWidth: .infinity, alignment: .leading)
                Text(verbatim: "\(count(item))")
                  .scaledFont(.xs)
                  .monospacedDigit()
                  .foregroundStyle(Color.labelSecondary)
              }
            }
          }
        }
        SplitViewList(LocalizedStringKey(view)) {
          VStack(spacing: 0) {
            ForEach(list) { ticket in
              SwipeActions(revealed: swiped == ticket.id ? -88 : 0) {
                SplitViewItem(isActive: ticket.id == selected, action: { selected = ticket.id }) {
                  InboxSupportRow(ticket: ticket)
                }
              } leading: {
                EmptyView()
              } trailing: {
                if ticket.status != .solved {
                  SwipeAction("Solved", icon: Ph.check.bold, variant: .default, fullSwipe: true) {
                    setStatus(.solved, for: ticket.id)
                  }
                }
              }
              .transition(.opacity)
            }
            if list.isEmpty {
              Text("No tickets")
                .scaledFont(.sm)
                .foregroundStyle(Color.labelSecondary)
                .frame(maxWidth: .infinity)
                .padding(24)
            }
          }
        }
        SplitViewDetail {
          if let current {
            detail(current)
              .id(current.id)
              .transition(.opacity.combined(with: .offset(y: 8)))
          }
        }
      }
    }
  }

  private func detail(_ ticket: Ticket) -> some View {
    let ready = !reply.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
    return VStack(alignment: .leading, spacing: 16) {
      Text(verbatim: "\(ticket.id) · \(ticket.device)")
        .scaledFont(.sm)
        .foregroundStyle(Color.labelSecondary)
        .padding(.top, 8)
      ToggleGroup(
        selection: Binding<Status?>(
          get: { ticket.status },
          set: { value in if let value { setStatus(value, for: ticket.id) } }
        ),
        size: .sm,
        spacing: 0
      ) {
        ForEach(Status.allCases, id: \.self) { status in
          ToggleGroupItem(LocalizedStringKey(status.rawValue), value: status)
        }
      }
      .accessibilityLabel(Text("Status"))
      Text(verbatim: ticket.title)
        .scaledTextStyle(.xl3, weight: .semibold)
        .fixedSize(horizontal: false, vertical: true)
        .accessibilityAddTraits(.isHeader)
      HStack(spacing: 10) {
        InboxSupportAvatar(ticket: ticket, size: 34)
        VStack(alignment: .leading, spacing: 0) {
          Text(verbatim: ticket.requester)
            .scaledFont(.sm, weight: .semibold)
          Text("Today 8:12 AM")
            .scaledFont(.xs)
            .foregroundStyle(Color.labelSecondary)
        }
      }
      .accessibilityElement(children: .combine)
      Text("Hi, this started right after the latest update. I tried restarting but it keeps happening. Can you help?")
        .scaledTextStyle(.base)
        .lineSpacing(4)
        .fixedSize(horizontal: false, vertical: true)
        .padding(.horizontal, 14)
        .padding(.vertical, 12)
        .background(
          UnevenRoundedRectangle(
            topLeadingRadius: 4,
            bottomLeadingRadius: Radius.xl2,
            bottomTrailingRadius: Radius.xl2,
            topTrailingRadius: Radius.xl2,
            style: .continuous
          )
          .fill(Color.surfaceSecondary)
        )
      VStack(alignment: .leading, spacing: 10) {
        TextField("Write a reply…", text: $reply, axis: .vertical)
          .textFieldStyle(.textarea)
          .lineLimit(3...8)
          .accessibilityLabel(Text("Reply"))
        HStack(spacing: 10) {
          Button("Send and set pending") {
            onReply?(ticket.id, reply)
            reply = ""
            setStatus(.pending, for: ticket.id)
          }
          .buttonStyle(.variant(.default, size: .sm))
          .disabled(!ready)
          Button("Mark as solved") {
            setStatus(.solved, for: ticket.id)
          }
          .buttonStyle(.variant(.outline, size: .sm))
        }
      }
    }
    .foregroundStyle(Color.label)
  }

  private func setStatus(_ status: Status, for id: String) {
    guard let index = tickets.firstIndex(where: { $0.id == id }), tickets[index].status != status else { return }
    onStatusChange?(id, status)
    withAnimation(reduceMotion ? nil : .timingCurve(0.32, 0.72, 0, 1, duration: 0.35)) {
      tickets[index].status = status
    }
  }
}

private struct InboxSupportAvatar: View {
  let ticket: InboxSupport.Ticket
  let size: CGFloat

  var body: some View {
    Text(verbatim: ticket.requester.split(separator: " ").compactMap(\.first).map(String.init).joined())
      .font(.system(size: size * 0.4, weight: .semibold))
      .foregroundStyle(Color.onAccent)
      .frame(width: size, height: size)
      .background(ticket.tint, in: Circle())
      .accessibilityHidden(true)
  }
}

private struct InboxSupportRow: View {
  let ticket: InboxSupport.Ticket

  var body: some View {
    VStack(alignment: .leading, spacing: 4) {
      HStack(spacing: 8) {
        Text(verbatim: "\(ticket.id) · \(ticket.device)")
          .scaledFont(.xs)
          .foregroundStyle(Color.labelSecondary)
          .frame(maxWidth: .infinity, alignment: .leading)
        InboxSupportPriority(priority: ticket.priority)
      }
      Text(verbatim: ticket.title)
        .scaledFont(.base, weight: .semibold)
      HStack(spacing: 6) {
        InboxSupportAvatar(ticket: ticket, size: 18)
        Text(verbatim: ticket.requester)
          .scaledFont(.xs)
          .foregroundStyle(Color.labelSecondary)
      }
      .padding(.top, 2)
    }
    .accessibilityElement(children: .combine)
  }
}

private struct InboxSupportPriority: View {
  let priority: InboxSupport.Priority

  var body: some View {
    let tint: Color = switch priority {
    case .high: .danger
    case .medium: .warning
    case .low: .labelSecondary
    }
    Text(LocalizedStringKey(priority.rawValue))
      .scaledFont(.xs2, weight: .semibold)
      .foregroundStyle(tint)
      .padding(.horizontal, 8)
      .padding(.vertical, 2)
      .background(priority == .low ? Color.control : tint.opacity(0.14), in: RoundedRectangle(cornerRadius: Radius.md, style: .continuous))
  }
}
```

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

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.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.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.key
import androidx.compose.runtime.mutableStateListOf
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.graphics.Color
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.graphics.lerp
import androidx.compose.ui.graphics.vector.ImageVector
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.heading
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.input.KeyboardCapitalization
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.Dp
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.Regular
import com.adamglin.phosphoricons.bold.Check as BoldCheck
import com.adamglin.phosphoricons.regular.ChatCircle
import com.adamglin.phosphoricons.regular.Check
import com.adamglin.phosphoricons.regular.Tray
import com.esuiss.ui.components.Button
import com.esuiss.ui.components.ButtonSize
import com.esuiss.ui.components.ButtonVariant
import com.esuiss.ui.components.Icon
import com.esuiss.ui.components.Screen
import com.esuiss.ui.components.Textarea
import com.esuiss.ui.components.ToggleGroup
import com.esuiss.ui.components.ToggleGroupItem
import com.esuiss.ui.components.ToggleSize
import com.esuiss.ui.interactions.SwipeAction
import com.esuiss.ui.interactions.SwipeActions
import com.esuiss.ui.patterns.SplitView
import com.esuiss.ui.patterns.SplitViewColumn
import com.esuiss.ui.patterns.SplitViewItem
import com.esuiss.ui.theme.Colors
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

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

private class SupportTicket(
    val id: String,
    val title: String,
    val device: String,
    status: String,
    val priority: String,
    val requester: String,
    val hue: Int,
) {
    var status by mutableStateOf(status)
}

private fun supportTickets() = listOf(
    SupportTicket("#4821", "Screen flickers", "Phone Pro", "Open", "High", "Jamie Rivera", 30),
    SupportTicket("#4820", "Battery drains fast", "Book Air", "Pending", "Medium", "Morgan Lee", 200),
    SupportTicket("#4819", "Pods won't pair", "Pods Studio", "Open", "Low", "Avery Brooks", 330),
    SupportTicket("#4818", "Cloud backup error", "Phone Air", "Solved", "Medium", "Taylor Kim", 120),
)

private class SupportView(val value: String, val icon: ImageVector)

private val SupportViews = listOf(
    SupportView("Open", PhosphorIcons.Regular.ChatCircle),
    SupportView("Pending", PhosphorIcons.Regular.ChatCircle),
    SupportView("Solved", PhosphorIcons.Regular.Check),
    SupportView("All", PhosphorIcons.Regular.Tray),
)

private val TicketStatuses = listOf("Open", "Pending", "Solved")

private fun requesterTint(colors: Colors, hue: Int): Color = when (hue) {
    30 -> colors.orange
    200 -> colors.blue
    330 -> colors.pink
    else -> colors.green
}

private fun priorityColors(colors: Colors, priority: String): Pair<Color, Color> = when (priority) {
    "High" -> colors.dangerSurface to if (colors.isDark) colors.danger else lerp(colors.danger, colors.label, 0.3f)
    "Medium" -> colors.warningSurface to if (colors.isDark) colors.orange else lerp(colors.orange, colors.label, 0.5f)
    else -> colors.control to colors.labelSecondary
}

@Composable
fun InboxSupport(
    modifier: Modifier = Modifier,
    onViewChange: (view: String) -> Unit = {},
    onStatusChange: (id: String, status: String) -> Unit = { _, _ -> },
    onReply: (id: String, text: String) -> Unit = { _, _ -> },
) {
    val colors = EsuissTheme.colors
    val tickets = remember { mutableStateListOf<SupportTicket>().apply { addAll(supportTickets()) } }
    var view by rememberSaveable { mutableStateOf("Open") }
    var selected by rememberSaveable { mutableStateOf("#4821") }
    var column by rememberSaveable { mutableStateOf(SplitViewColumn.List) }
    val list = tickets.filter { view == "All" || it.status == view }
    val current = tickets.firstOrNull { it.id == selected }

    fun setStatus(ticket: SupportTicket, status: String) {
        if (ticket.status == status) return
        onStatusChange(ticket.id, status)
        ticket.status = status
    }

    Screen(modifier) {
        SplitView(column = column, onColumnChange = { column = it }) {
            SplitViewSidebar(title = "Support") {
                SupportViews.forEach { item ->
                    SplitViewItem(
                        isActive = view == item.value,
                        onClick = {
                            onViewChange(item.value)
                            view = item.value
                        },
                    ) {
                        Row(horizontalArrangement = Arrangement.spacedBy(10.dp), verticalAlignment = Alignment.CenterVertically) {
                            Icon(item.icon, contentDescription = null, size = 18.dp, tint = colors.accent)
                            BasicText(item.value, modifier = Modifier.weight(1f), style = Typography.base.copy(color = colors.label))
                            val count = if (item.value == "All") tickets.size else tickets.count { it.status == item.value }
                            BasicText("$count", style = Typography.xs.copy(color = colors.labelSecondary, fontFeatureSettings = "tnum"))
                        }
                    }
                }
            }
            SplitViewList(title = view) {
                list.forEach { ticket ->
                    key(ticket.id) {
                        SwipeActions(
                            trailing = if (ticket.status == "Solved") {
                                emptyList()
                            } else {
                                listOf(
                                    SwipeAction(
                                        label = "Mark as solved",
                                        onClick = { setStatus(ticket, "Solved") },
                                        icon = PhosphorIcons.Bold.BoldCheck,
                                        fullSwipe = true,
                                    ),
                                )
                            },
                        ) {
                            TicketRow(ticket, active = ticket.id == selected) { selected = ticket.id }
                        }
                    }
                }
                if (list.isEmpty()) {
                    BasicText(
                        "No tickets",
                        modifier = Modifier
                            .fillMaxWidth()
                            .padding(24.dp),
                        style = Typography.sm.copy(color = colors.labelSecondary, textAlign = TextAlign.Center),
                    )
                }
            }
            SplitViewDetail {
                if (current != null) {
                    key(current.id) {
                        TicketDetail(
                            ticket = current,
                            onStatus = { setStatus(current, it) },
                            onReply = { onReply(current.id, it) },
                        )
                    }
                }
            }
        }
    }
}

@Composable
private fun TicketRow(ticket: SupportTicket, active: Boolean, onClick: () -> Unit) {
    val colors = EsuissTheme.colors
    val (fill, ink) = priorityColors(colors, ticket.priority)
    SplitViewItem(isActive = active, onClick = onClick) {
        Column(verticalArrangement = Arrangement.spacedBy(4.dp)) {
            Row(horizontalArrangement = Arrangement.spacedBy(8.dp), verticalAlignment = Alignment.CenterVertically) {
                BasicText(
                    "${ticket.id} · ${ticket.device}",
                    modifier = Modifier.weight(1f),
                    style = Typography.xs.copy(color = colors.labelSecondary),
                )
                BasicText(
                    ticket.priority,
                    modifier = Modifier
                        .background(fill, RoundedCornerShape(Radius.md))
                        .padding(horizontal = 8.dp, vertical = 2.dp),
                    style = Typography.xs3.copy(color = ink, fontWeight = FontWeight.SemiBold),
                )
            }
            BasicText(ticket.title, style = Typography.base.copy(color = colors.label, fontWeight = FontWeight.SemiBold))
            Row(
                modifier = Modifier.padding(top = 4.dp),
                horizontalArrangement = Arrangement.spacedBy(6.dp),
                verticalAlignment = Alignment.CenterVertically,
            ) {
                TicketRequester(ticket, 18.dp)
                BasicText(ticket.requester, style = Typography.xs.copy(color = colors.labelSecondary))
            }
        }
    }
}

@Composable
private fun TicketRequester(ticket: SupportTicket, size: Dp) {
    val colors = EsuissTheme.colors
    Box(
        Modifier
            .size(size)
            .background(requesterTint(colors, ticket.hue), CircleShape),
        contentAlignment = Alignment.Center,
    ) {
        BasicText(
            ticket.requester.split(" ").mapNotNull { it.firstOrNull() }.joinToString(""),
            style = Typography.xs.copy(color = colors.onMedia, fontWeight = FontWeight.Medium, fontSize = (size.value * 0.4f).sp),
        )
    }
}

@Composable
private fun TicketDetail(ticket: SupportTicket, onStatus: (String) -> Unit, onReply: (String) -> Unit) {
    val colors = EsuissTheme.colors
    var reply by rememberSaveable { mutableStateOf("") }
    val appear = remember { Animatable(0f) }
    LaunchedEffect(Unit) { appear.animateTo(1f, tween(800, easing = TicketRevealEasing)) }
    Column(
        modifier = Modifier
            .fillMaxWidth()
            .padding(top = 8.dp)
            .graphicsLayer {
                alpha = appear.value
                translationY = (1f - appear.value) * 8.dp.toPx()
            },
        verticalArrangement = Arrangement.spacedBy(16.dp),
    ) {
        BasicText("${ticket.id} · ${ticket.device}", style = Typography.sm.copy(color = colors.labelSecondary))
        ToggleGroup(
            value = ticket.status,
            onValueChange = { if (it != null) onStatus(it) },
            modifier = Modifier.semantics { contentDescription = "Status" },
            size = ToggleSize.Sm,
            spacing = 0,
        ) {
            TicketStatuses.forEach { ToggleGroupItem(it, it) }
        }
        BasicText(
            ticket.title,
            modifier = Modifier.semantics { heading() },
            style = Typography.xl2.copy(color = colors.label, fontWeight = FontWeight.SemiBold),
        )
        Row(horizontalArrangement = Arrangement.spacedBy(10.dp), verticalAlignment = Alignment.CenterVertically) {
            TicketRequester(ticket, 34.dp)
            Column {
                BasicText(ticket.requester, style = Typography.sm.copy(color = colors.label, fontWeight = FontWeight.SemiBold))
                BasicText("Today 8:12 AM", style = Typography.xs.copy(color = colors.labelSecondary))
            }
        }
        BasicText(
            "Hi, this started right after the latest update. I tried restarting but it keeps happening. Can you help?",
            modifier = Modifier
                .widthIn(max = 520.dp)
                .background(colors.surfaceSecondary, RoundedCornerShape(topStart = 4.dp, topEnd = 16.dp, bottomEnd = 16.dp, bottomStart = 16.dp))
                .padding(horizontal = 14.dp, vertical = 12.dp),
            style = Typography.base.copy(color = colors.label, lineHeight = 26.sp),
        )
        Column(verticalArrangement = Arrangement.spacedBy(10.dp)) {
            Textarea(
                value = reply,
                onValueChange = { reply = it },
                modifier = Modifier.semantics { contentDescription = "Reply" },
                placeholder = "Write a reply…",
                minLines = 3,
                keyboardOptions = KeyboardOptions(capitalization = KeyboardCapitalization.Sentences),
            )
            Row(horizontalArrangement = Arrangement.spacedBy(10.dp)) {
                Button(
                    text = "Send and set pending",
                    onClick = {
                        onReply(reply.trim())
                        reply = ""
                        onStatus("Pending")
                    },
                    size = ButtonSize.Sm,
                    enabled = reply.isNotBlank(),
                )
                Button(text = "Mark as solved", onClick = { onStatus("Solved") }, size = ButtonSize.Sm, variant = ButtonVariant.Outline)
            }
        }
    }
}
```

A help desk screen built on `SplitView`, with a sidebar of queues, a list of tickets showing the requester `Avatar`, priority and device, and a detail view. In the detail view a `ToggleGroup` changes the ticket status, a `Textarea` takes a reply, Send and set pending sends it and moves the ticket to Pending, and Mark as solved closes it.

## Installation

```bash title="Terminal"
npx @esuiss/uim@latest add inbox-support
```

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

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

The CLI also adds what it builds on: [Avatar](/docs/components/avatar), [Button](/docs/components/button), [Icon](/docs/components/icon), [Screen](/docs/components/screen), [Split View](/docs/patterns/split-view), [Text](/docs/components/text), [Textarea](/docs/components/textarea), [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: [Avatar](/docs/components/avatar), [Button](/docs/components/button), [Icon](/docs/components/icon), [Screen](/docs/components/screen), [Split View](/docs/patterns/split-view), [Text](/docs/components/text), [Textarea](/docs/components/textarea), [Toggle Group](/docs/components/toggle-group).

3. Copy the source into `components/blocks/inbox-support.tsx`:

```tsx title="uniwind/components/blocks/inbox-support.tsx"
import { cn } from "cn"
import {
  ChatCircleIcon,
  CheckIcon,
  type Icon as PhosphorIcon,
  TrayIcon,
} from "phosphor-react-native"
import * as React from "react"
import { useWindowDimensions, View } from "react-native"
import { FadeInDown, ReduceMotion } from "react-native-reanimated"
import {
  SplitView,
  type SplitViewColumn,
  SplitViewDetail,
  SplitViewItem,
  SplitViewList,
  SplitViewSidebar,
} from "@/components/patterns/split-view"
import { AnimatedView } from "@/components/ui/animated-view"
import { Avatar, AvatarFallback } from "@/components/ui/avatar"
import { Button } from "@/components/ui/button"
import { Icon } from "@/components/ui/icon"
import { Screen } from "@/components/ui/screen"
import { Text } from "@/components/ui/text"
import { Textarea } from "@/components/ui/textarea"
import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group"

type Status = "Open" | "Pending" | "Solved"

type Priority = "High" | "Medium" | "Low"

type Queue = Status | "All"

type Ticket = {
  id: string
  title: string
  device: string
  status: Status
  priority: Priority
  requester: string
  tint: string
}

const INITIAL_TICKETS: Ticket[] = [
  {
    id: "#4821",
    title: "Screen flickers",
    device: "Phone Pro",
    status: "Open",
    priority: "High",
    requester: "Jamie Rivera",
    tint: "bg-orange dark:bg-orange",
  },
  {
    id: "#4820",
    title: "Battery drains fast",
    device: "Book Air",
    status: "Pending",
    priority: "Medium",
    requester: "Morgan Lee",
    tint: "bg-cyan dark:bg-cyan",
  },
  {
    id: "#4819",
    title: "Pods won't pair",
    device: "Pods Studio",
    status: "Open",
    priority: "Low",
    requester: "Avery Brooks",
    tint: "bg-pink dark:bg-pink",
  },
  {
    id: "#4818",
    title: "Cloud backup error",
    device: "Phone Air",
    status: "Solved",
    priority: "Medium",
    requester: "Taylor Kim",
    tint: "bg-green dark:bg-green",
  },
]

const VIEWS: { value: Queue; icon: PhosphorIcon }[] = [
  { value: "Open", icon: ChatCircleIcon },
  { value: "Pending", icon: ChatCircleIcon },
  { value: "Solved", icon: CheckIcon },
  { value: "All", icon: TrayIcon },
]

const STATUSES: Status[] = ["Open", "Pending", "Solved"]

const PRIORITY_CLASS: Record<Priority, { box: string; text: string }> = {
  High: { box: "bg-danger-surface", text: "text-danger" },
  Medium: { box: "bg-warning-surface", text: "text-warning" },
  Low: { box: "bg-control", text: "text-label-secondary" },
}

const initials = (name: string) =>
  name
    .split(" ")
    .map((part) => part[0])
    .join("")

function Requester({
  ticket,
  size,
  className,
}: {
  ticket: Ticket
  size: "sm" | "default"
  className?: string
}) {
  return (
    <Avatar size={size} className={className}>
      <AvatarFallback className={ticket.tint}>
        {initials(ticket.requester)}
      </AvatarFallback>
    </Avatar>
  )
}

function TicketDetail({
  ticket,
  onStatusChange,
  onReply,
}: {
  ticket: Ticket
  onStatusChange: (status: Status) => void
  onReply: (text: string) => void
}) {
  const [reply, setReply] = React.useState("")

  return (
    <AnimatedView
      key={ticket.id}
      entering={FadeInDown.duration(800).reduceMotion(ReduceMotion.System)}
      className="gap-4"
    >
      <Text className="text-sm text-label-secondary">
        {`${ticket.id} · ${ticket.device}`}
      </Text>
      <ToggleGroup
        spacing={0}
        size="sm"
        value={[ticket.status]}
        onValueChange={(value) => {
          if (value[0]) onStatusChange(value[0] as Status)
        }}
        accessibilityLabel="Status"
      >
        {STATUSES.map((status) => (
          <ToggleGroupItem key={status} value={status}>
            <Text>{status}</Text>
          </ToggleGroupItem>
        ))}
      </ToggleGroup>
      <Text role="heading" className="text-3xl font-semibold">
        {ticket.title}
      </Text>
      <View className="flex-row items-center gap-2.5">
        <Requester ticket={ticket} size="default" className="size-8.5" />
        <View>
          <Text className="text-sm font-semibold">{ticket.requester}</Text>
          <Text className="text-xs text-label-secondary">Today 8:12 AM</Text>
        </View>
      </View>
      <View className="max-w-lg self-start rounded-2xl rounded-ss-sm bg-surface-secondary px-3.5 py-3">
        <Text className="text-base">
          Hi, this started right after the latest update. I tried restarting but
          it keeps happening. Can you help?
        </Text>
      </View>
      <View className="gap-2.5">
        <Textarea
          numberOfLines={3}
          value={reply}
          onChangeText={setReply}
          placeholder="Write a reply…"
          accessibilityLabel="Reply"
          className="min-h-20"
        />
        <View className="flex-row flex-wrap gap-2.5">
          <Button
            size="sm"
            disabled={!reply}
            onPress={() => {
              onReply(reply)
              setReply("")
              onStatusChange("Pending")
            }}
          >
            <Text>Send and set pending</Text>
          </Button>
          <Button
            size="sm"
            variant="outline"
            onPress={() => onStatusChange("Solved")}
          >
            <Text>Mark as solved</Text>
          </Button>
        </View>
      </View>
    </AnimatedView>
  )
}

function InboxSupport({
  onViewChange,
  onStatusChange,
  onReply,
}: {
  onViewChange?: (view: Status | "All") => void
  onStatusChange?: (id: string, status: Status) => void
  onReply?: (id: string, text: string) => void
}) {
  const { width } = useWindowDimensions()
  const wide = width >= 768
  const [tickets, setTickets] = React.useState(INITIAL_TICKETS)
  const [view, setView] = React.useState<Queue>("Open")
  const [selected, setSelected] = React.useState("#4821")
  const [column, setColumn] = React.useState<SplitViewColumn>("list")
  const list = tickets.filter(
    (ticket) => view === "All" || ticket.status === view
  )
  const current = tickets.find((ticket) => ticket.id === selected)

  const setStatus = (id: string, status: Status) => {
    onStatusChange?.(id, status)
    setTickets((items) =>
      items.map((ticket) => (ticket.id === id ? { ...ticket, status } : ticket))
    )
  }

  return (
    <Screen edges={["top", "right", "left"]}>
      <SplitView
        column={column}
        onColumnChange={setColumn}
        className={wide ? "m-4" : undefined}
      >
        <SplitViewSidebar
          title="Support"
          className={wide ? "min-h-full bg-surface-secondary" : "px-4 pb-8"}
        >
          {VIEWS.map((item) => (
            <SplitViewItem
              key={item.value}
              isActive={view === item.value}
              onPress={() => {
                setView(item.value)
                onViewChange?.(item.value)
              }}
              className={wide && view === item.value ? "bg-control" : undefined}
            >
              <View className="flex-row items-center gap-2.5">
                <Icon as={item.icon} className="size-5 text-accent" />
                <Text className="flex-1">{item.value}</Text>
                <Text className="text-xs text-label-secondary tabular-nums">
                  {String(
                    item.value === "All"
                      ? tickets.length
                      : tickets.filter((ticket) => ticket.status === item.value)
                          .length
                  )}
                </Text>
              </View>
            </SplitViewItem>
          ))}
        </SplitViewSidebar>
        <SplitViewList
          title={view}
          className={wide ? "gap-1 p-2" : "gap-1 px-4 pb-8"}
        >
          {list.map((ticket) => {
            const priority = PRIORITY_CLASS[ticket.priority]
            return (
              <SplitViewItem
                key={ticket.id}
                isActive={ticket.id === selected}
                onPress={() => setSelected(ticket.id)}
                className="py-3"
              >
                <View className="flex-row items-center gap-2">
                  <Text className="flex-1 text-xs text-label-secondary">
                    {`${ticket.id} · ${ticket.device}`}
                  </Text>
                  <View className={cn("rounded-md px-2 py-0.5", priority.box)}>
                    <Text
                      className={cn("text-2xs font-semibold", priority.text)}
                    >
                      {ticket.priority}
                    </Text>
                  </View>
                </View>
                <Text className="text-base font-semibold">{ticket.title}</Text>
                <View className="mt-1 flex-row items-center gap-1.5">
                  <Requester ticket={ticket} size="sm" className="size-5" />
                  <Text className="text-xs text-label-secondary">
                    {ticket.requester}
                  </Text>
                </View>
              </SplitViewItem>
            )
          })}
          {list.length === 0 ? (
            <Text className="p-6 text-center text-sm text-label-secondary">
              No tickets
            </Text>
          ) : null}
        </SplitViewList>
        <SplitViewDetail className={wide ? "p-5.5" : "px-4 pb-8"}>
          {current ? (
            <TicketDetail
              ticket={current}
              onStatusChange={(status) => setStatus(current.id, status)}
              onReply={(text) => onReply?.(current.id, text)}
            />
          ) : null}
        </SplitViewDetail>
      </SplitView>
    </Screen>
  )
}

export { InboxSupport }
```

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: [Avatar](/docs/components/avatar), [Button](/docs/components/button), [Icon](/docs/components/icon), [Screen](/docs/components/screen), [Split View](/docs/patterns/split-view), [Text](/docs/components/text), [Textarea](/docs/components/textarea), [Toggle Group](/docs/components/toggle-group).

3. Copy the source into `components/blocks/inbox-support.tsx`:

```tsx title="nativewind/components/blocks/inbox-support.tsx"
import { cn } from "cn"
import {
  ChatCircleIcon,
  CheckIcon,
  type Icon as PhosphorIcon,
  TrayIcon,
} from "phosphor-react-native"
import * as React from "react"
import { useWindowDimensions, View } from "react-native"
import { FadeInDown, ReduceMotion } from "react-native-reanimated"
import {
  SplitView,
  type SplitViewColumn,
  SplitViewDetail,
  SplitViewItem,
  SplitViewList,
  SplitViewSidebar,
} from "@/components/patterns/split-view"
import { AnimatedView } from "@/components/ui/animated-view"
import { Avatar, AvatarFallback } from "@/components/ui/avatar"
import { Button } from "@/components/ui/button"
import { Icon } from "@/components/ui/icon"
import { Screen } from "@/components/ui/screen"
import { Text } from "@/components/ui/text"
import { Textarea } from "@/components/ui/textarea"
import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group"

type Status = "Open" | "Pending" | "Solved"

type Priority = "High" | "Medium" | "Low"

type Queue = Status | "All"

type Ticket = {
  id: string
  title: string
  device: string
  status: Status
  priority: Priority
  requester: string
  tint: string
}

const INITIAL_TICKETS: Ticket[] = [
  {
    id: "#4821",
    title: "Screen flickers",
    device: "Phone Pro",
    status: "Open",
    priority: "High",
    requester: "Jamie Rivera",
    tint: "bg-orange dark:bg-orange",
  },
  {
    id: "#4820",
    title: "Battery drains fast",
    device: "Book Air",
    status: "Pending",
    priority: "Medium",
    requester: "Morgan Lee",
    tint: "bg-cyan dark:bg-cyan",
  },
  {
    id: "#4819",
    title: "Pods won't pair",
    device: "Pods Studio",
    status: "Open",
    priority: "Low",
    requester: "Avery Brooks",
    tint: "bg-pink dark:bg-pink",
  },
  {
    id: "#4818",
    title: "Cloud backup error",
    device: "Phone Air",
    status: "Solved",
    priority: "Medium",
    requester: "Taylor Kim",
    tint: "bg-green dark:bg-green",
  },
]

const VIEWS: { value: Queue; icon: PhosphorIcon }[] = [
  { value: "Open", icon: ChatCircleIcon },
  { value: "Pending", icon: ChatCircleIcon },
  { value: "Solved", icon: CheckIcon },
  { value: "All", icon: TrayIcon },
]

const STATUSES: Status[] = ["Open", "Pending", "Solved"]

const PRIORITY_CLASS: Record<Priority, { box: string; text: string }> = {
  High: { box: "bg-danger-surface", text: "text-danger" },
  Medium: { box: "bg-warning-surface", text: "text-warning" },
  Low: { box: "bg-control", text: "text-label-secondary" },
}

const initials = (name: string) =>
  name
    .split(" ")
    .map((part) => part[0])
    .join("")

function Requester({
  ticket,
  size,
  className,
}: {
  ticket: Ticket
  size: "sm" | "default"
  className?: string
}) {
  return (
    <Avatar size={size} className={className}>
      <AvatarFallback className={ticket.tint}>
        {initials(ticket.requester)}
      </AvatarFallback>
    </Avatar>
  )
}

function TicketDetail({
  ticket,
  onStatusChange,
  onReply,
}: {
  ticket: Ticket
  onStatusChange: (status: Status) => void
  onReply: (text: string) => void
}) {
  const [reply, setReply] = React.useState("")

  return (
    <AnimatedView
      key={ticket.id}
      entering={FadeInDown.duration(800).reduceMotion(ReduceMotion.System)}
      className="gap-4"
    >
      <Text className="text-sm text-label-secondary">
        {`${ticket.id} · ${ticket.device}`}
      </Text>
      <ToggleGroup
        spacing={0}
        size="sm"
        value={[ticket.status]}
        onValueChange={(value) => {
          if (value[0]) onStatusChange(value[0] as Status)
        }}
        accessibilityLabel="Status"
      >
        {STATUSES.map((status) => (
          <ToggleGroupItem key={status} value={status}>
            <Text>{status}</Text>
          </ToggleGroupItem>
        ))}
      </ToggleGroup>
      <Text role="heading" className="text-3xl font-semibold">
        {ticket.title}
      </Text>
      <View className="flex-row items-center gap-2.5">
        <Requester ticket={ticket} size="default" className="size-[2.125rem]" />
        <View>
          <Text className="text-sm font-semibold">{ticket.requester}</Text>
          <Text className="text-xs text-label-secondary">Today 8:12 AM</Text>
        </View>
      </View>
      <View className="max-w-lg self-start rounded-2xl rounded-ss-sm bg-surface-secondary px-3.5 py-3">
        <Text className="text-base">
          Hi, this started right after the latest update. I tried restarting but
          it keeps happening. Can you help?
        </Text>
      </View>
      <View className="gap-2.5">
        <Textarea
          numberOfLines={3}
          value={reply}
          onChangeText={setReply}
          placeholder="Write a reply…"
          accessibilityLabel="Reply"
          className="min-h-20"
        />
        <View className="flex-row flex-wrap gap-2.5">
          <Button
            size="sm"
            disabled={!reply}
            onPress={() => {
              onReply(reply)
              setReply("")
              onStatusChange("Pending")
            }}
          >
            <Text>Send and set pending</Text>
          </Button>
          <Button
            size="sm"
            variant="outline"
            onPress={() => onStatusChange("Solved")}
          >
            <Text>Mark as solved</Text>
          </Button>
        </View>
      </View>
    </AnimatedView>
  )
}

function InboxSupport({
  onViewChange,
  onStatusChange,
  onReply,
}: {
  onViewChange?: (view: Status | "All") => void
  onStatusChange?: (id: string, status: Status) => void
  onReply?: (id: string, text: string) => void
}) {
  const { width } = useWindowDimensions()
  const wide = width >= 768
  const [tickets, setTickets] = React.useState(INITIAL_TICKETS)
  const [view, setView] = React.useState<Queue>("Open")
  const [selected, setSelected] = React.useState("#4821")
  const [column, setColumn] = React.useState<SplitViewColumn>("list")
  const list = tickets.filter(
    (ticket) => view === "All" || ticket.status === view
  )
  const current = tickets.find((ticket) => ticket.id === selected)

  const setStatus = (id: string, status: Status) => {
    onStatusChange?.(id, status)
    setTickets((items) =>
      items.map((ticket) => (ticket.id === id ? { ...ticket, status } : ticket))
    )
  }

  return (
    <Screen edges={["top", "right", "left"]}>
      <SplitView
        column={column}
        onColumnChange={setColumn}
        className={wide ? "m-4" : undefined}
      >
        <SplitViewSidebar
          title="Support"
          className={wide ? "min-h-full bg-surface-secondary" : "px-4 pb-8"}
        >
          {VIEWS.map((item) => (
            <SplitViewItem
              key={item.value}
              isActive={view === item.value}
              onPress={() => {
                setView(item.value)
                onViewChange?.(item.value)
              }}
              className={wide && view === item.value ? "bg-control" : undefined}
            >
              <View className="flex-row items-center gap-2.5">
                <Icon as={item.icon} className="size-5 text-accent" />
                <Text className="flex-1">{item.value}</Text>
                <Text className="text-xs text-label-secondary tabular-nums">
                  {String(
                    item.value === "All"
                      ? tickets.length
                      : tickets.filter((ticket) => ticket.status === item.value)
                          .length
                  )}
                </Text>
              </View>
            </SplitViewItem>
          ))}
        </SplitViewSidebar>
        <SplitViewList
          title={view}
          className={wide ? "gap-1 p-2" : "gap-1 px-4 pb-8"}
        >
          {list.map((ticket) => {
            const priority = PRIORITY_CLASS[ticket.priority]
            return (
              <SplitViewItem
                key={ticket.id}
                isActive={ticket.id === selected}
                onPress={() => setSelected(ticket.id)}
                className="py-3"
              >
                <View className="flex-row items-center gap-2">
                  <Text className="flex-1 text-xs text-label-secondary">
                    {`${ticket.id} · ${ticket.device}`}
                  </Text>
                  <View className={cn("rounded-md px-2 py-0.5", priority.box)}>
                    <Text
                      className={cn("text-2xs font-semibold", priority.text)}
                    >
                      {ticket.priority}
                    </Text>
                  </View>
                </View>
                <Text className="text-base font-semibold">{ticket.title}</Text>
                <View className="mt-1 flex-row items-center gap-1.5">
                  <Requester ticket={ticket} size="sm" className="size-5" />
                  <Text className="text-xs text-label-secondary">
                    {ticket.requester}
                  </Text>
                </View>
              </SplitViewItem>
            )
          })}
          {list.length === 0 ? (
            <Text className="p-6 text-center text-sm text-label-secondary">
              No tickets
            </Text>
          ) : null}
        </SplitViewList>
        <SplitViewDetail className={wide ? "p-[1.375rem]" : "px-4 pb-8"}>
          {current ? (
            <TicketDetail
              ticket={current}
              onStatusChange={(status) => setStatus(current.id, status)}
              onReply={(text) => onReply?.(current.id, text)}
            />
          ) : null}
        </SplitViewDetail>
      </SplitView>
    </Screen>
  )
}

export { InboxSupport }
```

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: [Avatar](/docs/components/avatar), [Button](/docs/components/button), [Icon](/docs/components/icon), [Screen](/docs/components/screen), [Split View](/docs/patterns/split-view), [Text](/docs/components/text), [Textarea](/docs/components/textarea), [Toggle Group](/docs/components/toggle-group).

3. Copy the source into `components/blocks/inbox-support.tsx`:

```tsx title="stylesheet/components/blocks/inbox-support.tsx"
import {
  ChatCircleIcon,
  CheckIcon,
  type Icon as PhosphorIcon,
  TrayIcon,
} from "phosphor-react-native"
import * as React from "react"
import {
  StyleSheet,
  useWindowDimensions,
  View,
  type ViewStyle,
} from "react-native"
import { FadeInDown, ReduceMotion } from "react-native-reanimated"
import {
  SplitView,
  type SplitViewColumn,
  SplitViewDetail,
  SplitViewItem,
  SplitViewList,
  SplitViewSidebar,
} from "@/components/patterns/split-view"
import { AnimatedView } from "@/components/ui/animated-view"
import { Avatar, AvatarFallback } from "@/components/ui/avatar"
import { Button } from "@/components/ui/button"
import { Icon } from "@/components/ui/icon"
import { Screen } from "@/components/ui/screen"
import { Text } from "@/components/ui/text"
import { Textarea } from "@/components/ui/textarea"
import {
  fontSize,
  radius,
  type ThemeColors,
  useTheme,
} from "@/components/ui/theme"
import { ToggleGroup, ToggleGroupItem } from "@/components/ui/toggle-group"

type Tint = keyof ThemeColors

type Status = "Open" | "Pending" | "Solved"

type Priority = "High" | "Medium" | "Low"

type Queue = Status | "All"

type Ticket = {
  id: string
  title: string
  device: string
  status: Status
  priority: Priority
  requester: string
  tint: Tint
}

const INITIAL_TICKETS: Ticket[] = [
  {
    id: "#4821",
    title: "Screen flickers",
    device: "Phone Pro",
    status: "Open",
    priority: "High",
    requester: "Jamie Rivera",
    tint: "orange",
  },
  {
    id: "#4820",
    title: "Battery drains fast",
    device: "Book Air",
    status: "Pending",
    priority: "Medium",
    requester: "Morgan Lee",
    tint: "cyan",
  },
  {
    id: "#4819",
    title: "Pods won't pair",
    device: "Pods Studio",
    status: "Open",
    priority: "Low",
    requester: "Avery Brooks",
    tint: "pink",
  },
  {
    id: "#4818",
    title: "Cloud backup error",
    device: "Phone Air",
    status: "Solved",
    priority: "Medium",
    requester: "Taylor Kim",
    tint: "green",
  },
]

const VIEWS: { value: Queue; icon: PhosphorIcon }[] = [
  { value: "Open", icon: ChatCircleIcon },
  { value: "Pending", icon: ChatCircleIcon },
  { value: "Solved", icon: CheckIcon },
  { value: "All", icon: TrayIcon },
]

const STATUSES: Status[] = ["Open", "Pending", "Solved"]

const PRIORITY_COLORS: Record<Priority, { box: Tint; text: Tint }> = {
  High: { box: "dangerSurface", text: "danger" },
  Medium: { box: "warningSurface", text: "warning" },
  Low: { box: "control", text: "labelSecondary" },
}

const styles = StyleSheet.create({
  detail: { gap: 16 },
  title: { ...fontSize["3xl"], fontWeight: "600" },
  requester: { flexDirection: "row", alignItems: "center", gap: 10 },
  semibold: { ...fontSize.sm, fontWeight: "600" },
  bubble: {
    maxWidth: 512,
    alignSelf: "flex-start",
    borderRadius: radius["2xl"],
    borderTopStartRadius: radius.sm,
    paddingHorizontal: 14,
    paddingVertical: 12,
  },
  replyBox: { gap: 10 },
  textarea: { minHeight: 80 },
  buttons: { flexDirection: "row", flexWrap: "wrap", gap: 10 },
  wide: { margin: 16 },
  sidebar: { paddingHorizontal: 16, paddingBottom: 32 },
  view: { flexDirection: "row", alignItems: "center", gap: 10 },
  fill: { flex: 1 },
  count: { ...fontSize.xs, fontVariant: ["tabular-nums"] },
  listWide: { gap: 4, padding: 8 },
  list: { gap: 4, paddingHorizontal: 16, paddingBottom: 32 },
  ticket: { paddingVertical: 12 },
  ticketTop: { flexDirection: "row", alignItems: "center", gap: 8 },
  ticketId: { ...fontSize.xs, flex: 1 },
  priority: {
    borderRadius: radius.md,
    paddingHorizontal: 8,
    paddingVertical: 2,
  },
  priorityText: { ...fontSize["2xs"], fontWeight: "600" },
  ticketTitle: { ...fontSize.base, fontWeight: "600" },
  ticketFooter: {
    marginTop: 4,
    flexDirection: "row",
    alignItems: "center",
    gap: 6,
  },
  empty: { ...fontSize.sm, padding: 24, textAlign: "center" },
  detailWide: { padding: 22 },
  detailCompact: { paddingHorizontal: 16, paddingBottom: 32 },
})

const initials = (name: string) =>
  name
    .split(" ")
    .map((part) => part[0])
    .join("")

function Requester({
  ticket,
  size,
  style,
}: {
  ticket: Ticket
  size: "sm" | "default"
  style?: ViewStyle
}) {
  const { colors } = useTheme()
  return (
    <Avatar size={size} style={style}>
      <AvatarFallback style={{ backgroundColor: colors[ticket.tint] }}>
        {initials(ticket.requester)}
      </AvatarFallback>
    </Avatar>
  )
}

function TicketDetail({
  ticket,
  onStatusChange,
  onReply,
}: {
  ticket: Ticket
  onStatusChange: (status: Status) => void
  onReply: (text: string) => void
}) {
  const { colors } = useTheme()
  const [reply, setReply] = React.useState("")

  return (
    <AnimatedView
      key={ticket.id}
      entering={FadeInDown.duration(800).reduceMotion(ReduceMotion.System)}
      style={styles.detail}
    >
      <Text style={[fontSize.sm, { color: colors.labelSecondary }]}>
        {`${ticket.id} · ${ticket.device}`}
      </Text>
      <ToggleGroup
        spacing={0}
        size="sm"
        value={[ticket.status]}
        onValueChange={(value) => {
          if (value[0]) onStatusChange(value[0] as Status)
        }}
        accessibilityLabel="Status"
      >
        {STATUSES.map((status) => (
          <ToggleGroupItem key={status} value={status}>
            <Text>{status}</Text>
          </ToggleGroupItem>
        ))}
      </ToggleGroup>
      <Text role="heading" style={styles.title}>
        {ticket.title}
      </Text>
      <View style={styles.requester}>
        <Requester
          ticket={ticket}
          size="default"
          style={{ width: 34, height: 34 }}
        />
        <View>
          <Text style={styles.semibold}>{ticket.requester}</Text>
          <Text style={[fontSize.xs, { color: colors.labelSecondary }]}>
            Today 8:12 AM
          </Text>
        </View>
      </View>
      <View
        style={[styles.bubble, { backgroundColor: colors.surfaceSecondary }]}
      >
        <Text style={fontSize.base}>
          Hi, this started right after the latest update. I tried restarting but
          it keeps happening. Can you help?
        </Text>
      </View>
      <View style={styles.replyBox}>
        <Textarea
          numberOfLines={3}
          value={reply}
          onChangeText={setReply}
          placeholder="Write a reply…"
          accessibilityLabel="Reply"
          style={styles.textarea}
        />
        <View style={styles.buttons}>
          <Button
            size="sm"
            disabled={!reply}
            onPress={() => {
              onReply(reply)
              setReply("")
              onStatusChange("Pending")
            }}
          >
            <Text>Send and set pending</Text>
          </Button>
          <Button
            size="sm"
            variant="outline"
            onPress={() => onStatusChange("Solved")}
          >
            <Text>Mark as solved</Text>
          </Button>
        </View>
      </View>
    </AnimatedView>
  )
}

function InboxSupport({
  onViewChange,
  onStatusChange,
  onReply,
}: {
  onViewChange?: (view: Status | "All") => void
  onStatusChange?: (id: string, status: Status) => void
  onReply?: (id: string, text: string) => void
}) {
  const { colors } = useTheme()
  const { width } = useWindowDimensions()
  const wide = width >= 768
  const [tickets, setTickets] = React.useState(INITIAL_TICKETS)
  const [view, setView] = React.useState<Queue>("Open")
  const [selected, setSelected] = React.useState("#4821")
  const [column, setColumn] = React.useState<SplitViewColumn>("list")
  const list = tickets.filter(
    (ticket) => view === "All" || ticket.status === view
  )
  const current = tickets.find((ticket) => ticket.id === selected)

  const setStatus = (id: string, status: Status) => {
    onStatusChange?.(id, status)
    setTickets((items) =>
      items.map((ticket) => (ticket.id === id ? { ...ticket, status } : ticket))
    )
  }

  return (
    <Screen edges={["top", "right", "left"]}>
      <SplitView
        column={column}
        onColumnChange={setColumn}
        style={wide ? styles.wide : undefined}
      >
        <SplitViewSidebar
          title="Support"
          style={
            wide
              ? { minHeight: "100%", backgroundColor: colors.surfaceSecondary }
              : styles.sidebar
          }
        >
          {VIEWS.map((item) => (
            <SplitViewItem
              key={item.value}
              isActive={view === item.value}
              onPress={() => {
                setView(item.value)
                onViewChange?.(item.value)
              }}
              style={
                wide && view === item.value
                  ? { backgroundColor: colors.control }
                  : undefined
              }
            >
              <View style={styles.view}>
                <Icon as={item.icon} size={20} color={colors.accent} />
                <Text style={styles.fill}>{item.value}</Text>
                <Text style={[styles.count, { color: colors.labelSecondary }]}>
                  {String(
                    item.value === "All"
                      ? tickets.length
                      : tickets.filter((ticket) => ticket.status === item.value)
                          .length
                  )}
                </Text>
              </View>
            </SplitViewItem>
          ))}
        </SplitViewSidebar>
        <SplitViewList
          title={view}
          style={wide ? styles.listWide : styles.list}
        >
          {list.map((ticket) => {
            const priority = PRIORITY_COLORS[ticket.priority]
            return (
              <SplitViewItem
                key={ticket.id}
                isActive={ticket.id === selected}
                onPress={() => setSelected(ticket.id)}
                style={styles.ticket}
              >
                <View style={styles.ticketTop}>
                  <Text
                    style={[styles.ticketId, { color: colors.labelSecondary }]}
                  >
                    {`${ticket.id} · ${ticket.device}`}
                  </Text>
                  <View
                    style={[
                      styles.priority,
                      { backgroundColor: colors[priority.box] },
                    ]}
                  >
                    <Text
                      style={[
                        styles.priorityText,
                        { color: colors[priority.text] },
                      ]}
                    >
                      {ticket.priority}
                    </Text>
                  </View>
                </View>
                <Text style={styles.ticketTitle}>{ticket.title}</Text>
                <View style={styles.ticketFooter}>
                  <Requester
                    ticket={ticket}
                    size="sm"
                    style={{ width: 20, height: 20 }}
                  />
                  <Text style={[fontSize.xs, { color: colors.labelSecondary }]}>
                    {ticket.requester}
                  </Text>
                </View>
              </SplitViewItem>
            )
          })}
          {list.length === 0 ? (
            <Text style={[styles.empty, { color: colors.labelSecondary }]}>
              No tickets
            </Text>
          ) : null}
        </SplitViewList>
        <SplitViewDetail
          style={wide ? styles.detailWide : styles.detailCompact}
        >
          {current ? (
            <TicketDetail
              ticket={current}
              onStatusChange={(status) => setStatus(current.id, status)}
              onReply={(text) => onReply?.(current.id, text)}
            />
          ) : null}
        </SplitViewDetail>
      </SplitView>
    </Screen>
  )
}

export { InboxSupport }
```

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/InboxSupport.swift"
import PhosphorSwift
import SwiftUI

public struct InboxSupport: View {
  public enum Status: String, CaseIterable, Sendable {
    case open = "Open"
    case pending = "Pending"
    case solved = "Solved"
  }

  enum Priority: String {
    case high = "High"
    case medium = "Medium"
    case low = "Low"
  }

  struct Ticket: Identifiable, Equatable {
    let id: String
    let title: String
    let device: String
    var status: Status
    let priority: Priority
    let requester: String
    let tint: Color
  }

  static var initialTickets: [Ticket] {
    [
      Ticket(id: "#4821", title: "Screen flickers", device: "Phone Pro", status: .open, priority: .high, requester: "Jamie Rivera", tint: .orange),
      Ticket(id: "#4820", title: "Battery drains fast", device: "Book Air", status: .pending, priority: .medium, requester: "Morgan Lee", tint: .blue),
      Ticket(id: "#4819", title: "Pods won't pair", device: "Pods Studio", status: .open, priority: .low, requester: "Avery Brooks", tint: .pink),
      Ticket(id: "#4818", title: "Cloud backup error", device: "Phone Air", status: .solved, priority: .medium, requester: "Taylor Kim", tint: .green),
    ]
  }

  static let views = ["Open", "Pending", "Solved", "All"]

  private var onViewChange: ((String) -> Void)?
  private var onReply: ((String, String) -> Void)?
  private var onStatusChange: ((String, Status) -> Void)?
  private let swiped: String?
  @State private var tickets: [Ticket]
  @State private var view: String
  @State private var selected: String
  @State private var reply: String
  @State private var column: SplitViewColumn
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  public init(
    onViewChange: ((_ view: String) -> Void)? = nil,
    onStatusChange: ((_ id: String, _ status: Status) -> Void)? = nil,
    onReply: ((_ id: String, _ text: String) -> Void)? = nil
  ) {
    self.init(view: "Open")
    self.onViewChange = onViewChange
    self.onReply = onReply
    self.onStatusChange = onStatusChange
  }

  init(
    view: String = "Open",
    selected: String = "#4821",
    reply: String = "",
    column: SplitViewColumn = .list,
    swiped: String? = nil
  ) {
    _tickets = State(initialValue: Self.initialTickets)
    _view = State(initialValue: view)
    _selected = State(initialValue: selected)
    _reply = State(initialValue: reply)
    _column = State(initialValue: column)
    self.swiped = swiped
  }

  private func count(_ value: String) -> Int {
    value == "All" ? tickets.count : tickets.filter { $0.status.rawValue == value }.count
  }

  public var body: some View {
    let list = tickets.filter { view == "All" || $0.status.rawValue == view }
    let current = tickets.first { $0.id == selected }
    Screen {
      SplitView(column: $column) {
        SplitViewSidebar("Support") {
          ForEach(Self.views, id: \.self) { item in
            SplitViewItem(isActive: view == item, action: {
              if view != item { onViewChange?(item) }
              view = item
            }) {
              HStack(spacing: 10) {
                (item == "Solved" ? Ph.check.regular : item == "All" ? Ph.tray.regular : Ph.chatCircle.regular)
                  .frame(width: 20, height: 20)
                  .foregroundStyle(Color.accent)
                Text(LocalizedStringKey(item))
                  .frame(maxWidth: .infinity, alignment: .leading)
                Text(verbatim: "\(count(item))")
                  .scaledFont(.xs)
                  .monospacedDigit()
                  .foregroundStyle(Color.labelSecondary)
              }
            }
          }
        }
        SplitViewList(LocalizedStringKey(view)) {
          VStack(spacing: 0) {
            ForEach(list) { ticket in
              SwipeActions(revealed: swiped == ticket.id ? -88 : 0) {
                SplitViewItem(isActive: ticket.id == selected, action: { selected = ticket.id }) {
                  InboxSupportRow(ticket: ticket)
                }
              } leading: {
                EmptyView()
              } trailing: {
                if ticket.status != .solved {
                  SwipeAction("Solved", icon: Ph.check.bold, variant: .default, fullSwipe: true) {
                    setStatus(.solved, for: ticket.id)
                  }
                }
              }
              .transition(.opacity)
            }
            if list.isEmpty {
              Text("No tickets")
                .scaledFont(.sm)
                .foregroundStyle(Color.labelSecondary)
                .frame(maxWidth: .infinity)
                .padding(24)
            }
          }
        }
        SplitViewDetail {
          if let current {
            detail(current)
              .id(current.id)
              .transition(.opacity.combined(with: .offset(y: 8)))
          }
        }
      }
    }
  }

  private func detail(_ ticket: Ticket) -> some View {
    let ready = !reply.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
    return VStack(alignment: .leading, spacing: 16) {
      Text(verbatim: "\(ticket.id) · \(ticket.device)")
        .scaledFont(.sm)
        .foregroundStyle(Color.labelSecondary)
        .padding(.top, 8)
      ToggleGroup(
        selection: Binding<Status?>(
          get: { ticket.status },
          set: { value in if let value { setStatus(value, for: ticket.id) } }
        ),
        size: .sm,
        spacing: 0
      ) {
        ForEach(Status.allCases, id: \.self) { status in
          ToggleGroupItem(LocalizedStringKey(status.rawValue), value: status)
        }
      }
      .accessibilityLabel(Text("Status"))
      Text(verbatim: ticket.title)
        .scaledTextStyle(.xl3, weight: .semibold)
        .fixedSize(horizontal: false, vertical: true)
        .accessibilityAddTraits(.isHeader)
      HStack(spacing: 10) {
        InboxSupportAvatar(ticket: ticket, size: 34)
        VStack(alignment: .leading, spacing: 0) {
          Text(verbatim: ticket.requester)
            .scaledFont(.sm, weight: .semibold)
          Text("Today 8:12 AM")
            .scaledFont(.xs)
            .foregroundStyle(Color.labelSecondary)
        }
      }
      .accessibilityElement(children: .combine)
      Text("Hi, this started right after the latest update. I tried restarting but it keeps happening. Can you help?")
        .scaledTextStyle(.base)
        .lineSpacing(4)
        .fixedSize(horizontal: false, vertical: true)
        .padding(.horizontal, 14)
        .padding(.vertical, 12)
        .background(
          UnevenRoundedRectangle(
            topLeadingRadius: 4,
            bottomLeadingRadius: Radius.xl2,
            bottomTrailingRadius: Radius.xl2,
            topTrailingRadius: Radius.xl2,
            style: .continuous
          )
          .fill(Color.surfaceSecondary)
        )
      VStack(alignment: .leading, spacing: 10) {
        TextField("Write a reply…", text: $reply, axis: .vertical)
          .textFieldStyle(.textarea)
          .lineLimit(3...8)
          .accessibilityLabel(Text("Reply"))
        HStack(spacing: 10) {
          Button("Send and set pending") {
            onReply?(ticket.id, reply)
            reply = ""
            setStatus(.pending, for: ticket.id)
          }
          .buttonStyle(.variant(.default, size: .sm))
          .disabled(!ready)
          Button("Mark as solved") {
            setStatus(.solved, for: ticket.id)
          }
          .buttonStyle(.variant(.outline, size: .sm))
        }
      }
    }
    .foregroundStyle(Color.label)
  }

  private func setStatus(_ status: Status, for id: String) {
    guard let index = tickets.firstIndex(where: { $0.id == id }), tickets[index].status != status else { return }
    onStatusChange?(id, status)
    withAnimation(reduceMotion ? nil : .timingCurve(0.32, 0.72, 0, 1, duration: 0.35)) {
      tickets[index].status = status
    }
  }
}

private struct InboxSupportAvatar: View {
  let ticket: InboxSupport.Ticket
  let size: CGFloat

  var body: some View {
    Text(verbatim: ticket.requester.split(separator: " ").compactMap(\.first).map(String.init).joined())
      .font(.system(size: size * 0.4, weight: .semibold))
      .foregroundStyle(Color.onAccent)
      .frame(width: size, height: size)
      .background(ticket.tint, in: Circle())
      .accessibilityHidden(true)
  }
}

private struct InboxSupportRow: View {
  let ticket: InboxSupport.Ticket

  var body: some View {
    VStack(alignment: .leading, spacing: 4) {
      HStack(spacing: 8) {
        Text(verbatim: "\(ticket.id) · \(ticket.device)")
          .scaledFont(.xs)
          .foregroundStyle(Color.labelSecondary)
          .frame(maxWidth: .infinity, alignment: .leading)
        InboxSupportPriority(priority: ticket.priority)
      }
      Text(verbatim: ticket.title)
        .scaledFont(.base, weight: .semibold)
      HStack(spacing: 6) {
        InboxSupportAvatar(ticket: ticket, size: 18)
        Text(verbatim: ticket.requester)
          .scaledFont(.xs)
          .foregroundStyle(Color.labelSecondary)
      }
      .padding(.top, 2)
    }
    .accessibilityElement(children: .combine)
  }
}

private struct InboxSupportPriority: View {
  let priority: InboxSupport.Priority

  var body: some View {
    let tint: Color = switch priority {
    case .high: .danger
    case .medium: .warning
    case .low: .labelSecondary
    }
    Text(LocalizedStringKey(priority.rawValue))
      .scaledFont(.xs2, weight: .semibold)
      .foregroundStyle(tint)
      .padding(.horizontal, 8)
      .padding(.vertical, 2)
      .background(priority == .low ? Color.control : tint.opacity(0.14), in: RoundedRectangle(cornerRadius: Radius.md, 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/Input.swift"
import SwiftUI

public struct InputStyle: TextFieldStyle {
  public enum Size: CaseIterable, Sendable {
    case `default`, md, sm

    var height: CGFloat {
      switch self {
      case .default: 44
      case .md: 36
      case .sm: 32
      }
    }

    var horizontalPadding: CGFloat {
      self == .sm ? 10 : 12
    }

    var radius: CGFloat {
      self == .sm ? Radius.md : Radius.lg
    }

    var textStyle: TextStyle {
      self == .default ? .base : .sm
    }
  }

  let size: Size

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

  public func _body(configuration: TextField<Self._Label>) -> some View {
    configuration.modifier(InputField(
      radius: size.radius,
      horizontalPadding: size.horizontalPadding,
      verticalPadding: 4,
      minHeight: size.height,
      textStyle: size.textStyle,
      alignment: .leading
    ))
  }
}

extension TextFieldStyle where Self == InputStyle {
  public static func input(size: InputStyle.Size = .default) -> InputStyle {
    InputStyle(size: size)
  }

  public static var input: InputStyle { InputStyle() }
}

struct InputField: ViewModifier {
  let radius: CGFloat
  let horizontalPadding: CGFloat
  let verticalPadding: CGFloat
  let minHeight: CGFloat
  let textStyle: TextStyle
  let alignment: Alignment

  @FocusState private var focused: Bool
  @Environment(\.isEnabled) private var isEnabled
  @Environment(\.isInvalid) private var invalid
  @Environment(\.colorScheme) private var colorScheme

  nonisolated init(
    radius: CGFloat,
    horizontalPadding: CGFloat,
    verticalPadding: CGFloat,
    minHeight: CGFloat,
    textStyle: TextStyle,
    alignment: Alignment
  ) {
    self.radius = radius
    self.horizontalPadding = horizontalPadding
    self.verticalPadding = verticalPadding
    self.minHeight = minHeight
    self.textStyle = textStyle
    self.alignment = alignment
  }

  func body(content: Content) -> some View {
    ButtonGroupItem(radius: radius) { shape in
      content
        .focused($focused)
        .scaledFont(textStyle)
        .foregroundStyle(isEnabled ? Color.label : .labelQuaternary)
        .tint(Color.accent)
        .padding(.horizontal, horizontalPadding)
        .padding(.vertical, verticalPadding)
        .frame(maxWidth: .infinity, minHeight: minHeight, alignment: alignment)
        .background(background, in: shape)
        .overlay {
          shape.strokeBorder(border, lineWidth: 1)
        }
        .contentShape(shape)
        .onTapGesture { focused = true }
    }
  }

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

  private var border: Color {
    if invalid { return .danger }
    return focused ? .focus : .clear
  }
}
```

```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/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/Textarea.swift"
import SwiftUI

public struct TextareaStyle: TextFieldStyle {
  public init() {}

  public func _body(configuration: TextField<Self._Label>) -> some View {
    configuration
      .lineLimit(1...8)
      .modifier(InputField(
        radius: Radius.xl,
        horizontalPadding: 12,
        verticalPadding: 12,
        minHeight: 64,
        textStyle: .base,
        alignment: .topLeading
      ))
  }
}

extension TextFieldStyle where Self == TextareaStyle {
  public static var textarea: TextareaStyle { TextareaStyle() }
}
```

```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/Interactions/SwipeActions.swift"
import SwiftUI

public enum SwipeActionVariant: CaseIterable, Sendable {
  case `default`, destructive, archive, neutral

  var color: Color {
    switch self {
    case .default: .accent
    case .destructive: .adaptive(light: .init(0xD0000A), dark: .init(0xB33B32))
    case .archive: .adaptive(light: .init(0x994AC1), dark: .init(0x863FA9))
    case .neutral: .adaptive(light: .init(0x66666A), dark: .init(0x555558))
    }
  }
}

enum SwipeActionsMode: Sendable {
  case native, custom, accessibility
}

struct SwipeActionsContext: Sendable {
  var mode: SwipeActionsMode = .native
  var full = false
  var trigger = 0
  var direction: LayoutDirection = .leftToRight
  var close: @MainActor @Sendable () -> Void = {}
}

extension EnvironmentValues {
  @Entry var swipeActions = SwipeActionsContext()
}

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

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

extension Notification.Name {
  static let swipeActionsOpen = Notification.Name("swipe-actions.open")
}

public struct SwipeActions<Content: View, Leading: View, Trailing: View>: View {
  let background: Color
  let content: Content
  let leading: Leading
  let trailing: Trailing

  @State private var id = UUID()
  @State private var offset: CGFloat = 0
  @State private var start: CGFloat?
  @State private var axis: Axis?
  @State private var rowWidth: CGFloat = 0
  @State private var rowHeight: CGFloat = 0
  @State private var leadingWidth: CGFloat = 0
  @State private var trailingWidth: CGFloat = 0
  @State private var leadingFull = false
  @State private var trailingFull = false
  @State private var full: HorizontalEdge?
  @State private var collapsed: CGFloat?
  @State private var trigger = 0
  @Environment(\.layoutDirection) private var layoutDirection
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  public init(
    background: Color = .surface,
    @ViewBuilder content: () -> Content,
    @ViewBuilder leading: () -> Leading,
    @ViewBuilder trailing: () -> Trailing
  ) {
    self.init(background: background, revealed: 0, content: content, leading: leading, trailing: trailing)
  }

  init(
    background: Color = .surface,
    revealed: CGFloat,
    full: HorizontalEdge? = nil,
    @ViewBuilder content: () -> Content,
    @ViewBuilder leading: () -> Leading,
    @ViewBuilder trailing: () -> Trailing
  ) {
    self.background = background
    self.content = content()
    self.leading = leading()
    self.trailing = trailing()
    _offset = State(initialValue: revealed)
    _full = State(initialValue: full)
  }

  public var body: some View {
    let close = closeAction
    ZStack {
      if offset > 0 {
        actions(leading, edge: .leading, revealed: offset, close: close)
      }
      if offset < 0 {
        actions(trailing, edge: .trailing, revealed: -offset, close: close)
      }
      content
        .frame(maxWidth: .infinity, alignment: .leading)
        .background(background)
        .overlay {
          if offset != 0 {
            Color.clear
              .contentShape(Rectangle())
              .onTapGesture { settle(0) }
              .accessibilityHidden(true)
          }
        }
        .offset(x: offset)
        .simultaneousGesture(drag)
        .accessibilityActions {
          Group {
            leading
            trailing
          }
          .environment(\.swipeActions, SwipeActionsContext(mode: .accessibility, close: close))
        }
    }
    .onGeometryChange(for: CGSize.self) { $0.size } action: { size in
      rowWidth = size.width
      if collapsed == nil { rowHeight = size.height }
    }
    .background {
      ZStack {
        measure(leading) { leadingWidth = $0 }
          .onPreferenceChange(SwipeFullKey.self) { leadingFull = $0 }
        measure(trailing) { trailingWidth = $0 }
          .onPreferenceChange(SwipeFullKey.self) { trailingFull = $0 }
      }
      .hidden()
      .accessibilityHidden(true)
      .allowsHitTesting(false)
    }
    .frame(height: collapsed, alignment: .top)
    .clipped()
    .hapticFeedback(.impact(weight: .medium), trigger: full) { HapticMoments.crossed($0, $1) }
    .accessibilityElement(children: .contain)
    .accessibilityAction(.escape) { settle(0) }
    .onReceive(NotificationCenter.default.publisher(for: .swipeActionsOpen)) { note in
      if let other = note.object as? UUID, other != id, offset != 0 {
        settle(0)
      }
    }
  }

  private var closeAction: @MainActor @Sendable () -> Void {
    let offset = $offset
    let full = $full
    let animation = settleAnimation
    return {
      withAnimation(animation) {
        offset.wrappedValue = 0
        full.wrappedValue = nil
      }
    }
  }

  private var settleAnimation: Animation? {
    reduceMotion ? .easeOut(duration: 0.15) : .timingCurve(0.32, 0.72, 0, 1, duration: 0.3)
  }

  private func measure<V: View>(_ view: V, _ update: @escaping (CGFloat) -> Void) -> some View {
    HStack(spacing: 0) { view }
      .environment(\.swipeActions, SwipeActionsContext(mode: .custom))
      .fixedSize()
      .onGeometryChange(for: CGFloat.self) { $0.size.width } action: { update($0) }
  }

  private func actions<V: View>(_ view: V, edge: HorizontalEdge, revealed: CGFloat, close: @escaping @MainActor @Sendable () -> Void) -> some View {
    let flipped: LayoutDirection = layoutDirection == .leftToRight ? .rightToLeft : .leftToRight
    return HStack(spacing: 0) { view }
      .environment(
        \.swipeActions,
        SwipeActionsContext(mode: .custom, full: full == edge, trigger: trigger, direction: layoutDirection, close: close)
      )
      .environment(\.layoutDirection, edge == .leading ? flipped : layoutDirection)
      .frame(width: max(revealed, 0), alignment: edge == .leading ? .trailing : .leading)
      .frame(maxHeight: .infinity)
      .clipped()
      .frame(maxWidth: .infinity, alignment: edge == .leading ? .leading : .trailing)
      .accessibilityHidden(true)
  }

  private var drag: some Gesture {
    DragGesture(minimumDistance: 8)
      .onChanged { value in
        if collapsed != nil { return }
        if axis == nil {
          let dx = abs(value.translation.width)
          let dy = abs(value.translation.height)
          if dx > 8 && dx > dy {
            axis = .horizontal
            start = offset
          } else if dy > 8 {
            axis = .vertical
          } else {
            return
          }
        }
        guard axis == .horizontal, let start else { return }
        var next = start + value.translation.width
        if next > 0 && leadingWidth == 0 { next = 0 }
        if next < 0 && trailingWidth == 0 { next = 0 }
        let edge: HorizontalEdge = next > 0 ? .leading : .trailing
        let limit = edge == .leading ? leadingWidth : trailingWidth
        let canFull = edge == .leading ? leadingFull : trailingFull
        let revealed = abs(next)
        if !canFull && revealed > limit {
          let extra = revealed - limit
          next = (next > 0 ? 1 : -1) * (limit + extra / (1 + extra / 40))
        }
        let nextFull: HorizontalEdge? = canFull && revealed > rowWidth * 0.6 ? edge : nil
        if nextFull != full {
          withAnimation(.easeOut(duration: 0.2)) { full = nextFull }
        }
        offset = next
      }
      .onEnded { _ in
        defer {
          axis = nil
          start = nil
        }
        guard axis == .horizontal else { return }
        if let full {
          fullSwipe(full)
          return
        }
        let edge: HorizontalEdge = offset > 0 ? .leading : .trailing
        let width = edge == .leading ? leadingWidth : trailingWidth
        if width > 0 && abs(offset) > width / 2 {
          settle(edge == .leading ? width : -width)
        } else {
          settle(0)
        }
      }
  }

  private func settle(_ value: CGFloat) {
    withAnimation(settleAnimation) {
      offset = value
      if value == 0 { full = nil }
    }
    if value != 0 {
      NotificationCenter.default.post(name: .swipeActionsOpen, object: id)
    }
  }

  private func fullSwipe(_ edge: HorizontalEdge) {
    let width = rowWidth
    let height = rowHeight
    withAnimation(.timingCurve(0.32, 0.72, 0, 1, duration: 0.18)) {
      offset = edge == .leading ? width : -width
    } completion: {
      collapsed = height
      withAnimation(reduceMotion ? nil : .timingCurve(0.32, 0.72, 0, 1, duration: 0.2)) {
        collapsed = 0
      } completion: {
        trigger += 1
        Task { @MainActor in
          try? await Task.sleep(for: .milliseconds(50))
          var transaction = Transaction()
          transaction.disablesAnimations = true
          withTransaction(transaction) {
            offset = 0
            full = nil
            collapsed = nil
          }
        }
      }
    }
  }
}

extension SwipeActions where Leading == EmptyView {
  public init(
    background: Color = .surface,
    @ViewBuilder content: () -> Content,
    @ViewBuilder trailing: () -> Trailing
  ) {
    self.init(background: background, content: content, leading: { EmptyView() }, trailing: trailing)
  }
}

extension SwipeActions where Trailing == EmptyView {
  public init(
    background: Color = .surface,
    @ViewBuilder content: () -> Content,
    @ViewBuilder leading: () -> Leading
  ) {
    self.init(background: background, content: content, leading: leading, trailing: { EmptyView() })
  }
}

public struct SwipeAction<Label: View>: View {
  let title: Text
  let variant: SwipeActionVariant
  let fullSwipe: Bool
  let action: () -> Void
  let label: Label

  @Environment(\.swipeActions) private var context

  public init(
    _ title: LocalizedStringKey,
    variant: SwipeActionVariant = .default,
    fullSwipe: Bool = false,
    action: @escaping () -> Void,
    @ViewBuilder label: () -> Label
  ) {
    self.title = Text(title)
    self.variant = variant
    self.fullSwipe = fullSwipe
    self.action = action
    self.label = label()
  }

  public var body: some View {
    switch context.mode {
    case .native:
      Button(role: variant == .destructive ? .destructive : nil, action: action) {
        label
      }
      .tint(variant.color)
    case .accessibility:
      Button(action: action) {
        title
      }
    case .custom:
      let hidden = context.full && !fullSwipe
      let grow = context.full && fullSwipe
      Button {
        action()
        context.close()
      } label: {
        label
          .labelStyle(SwipeActionLabelStyle())
          .font(TextStyle.xs.font(weight: .medium))
          .tracking(TextStyle.xs.letterSpacing)
          .multilineTextAlignment(.center)
          .foregroundStyle(Color.onAccent)
          .environment(\.layoutDirection, context.direction)
          .padding(.horizontal, hidden ? 0 : 12)
          .frame(minWidth: hidden ? 0 : 72, maxWidth: hidden ? 0 : .infinity, maxHeight: .infinity)
          .opacity(hidden ? 0 : 1)
          .background(variant.color)
          .contentShape(Rectangle())
      }
      .buttonStyle(SwipeActionButtonStyle())
      .layoutPriority(grow ? 1 : 0)
      .preference(key: SwipeFullKey.self, value: fullSwipe)
      .onChange(of: context.trigger) {
        if grow { action() }
      }
    }
  }
}

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

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

private struct SwipeActionLabelStyle: LabelStyle {
  func makeBody(configuration: Configuration) -> some View {
    VStack(spacing: 4) {
      configuration.icon.frame(width: 20, height: 20)
      configuration.title
    }
  }
}

private struct SwipeActionButtonStyle: ButtonStyle {
  func makeBody(configuration: Configuration) -> some View {
    configuration.label
      .brightness(configuration.isPressed ? -0.08 : 0)
  }
}
```

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

public enum SplitViewColumn: CaseIterable, Sendable {
  case sidebar, list, detail

  var next: SplitViewColumn {
    switch self {
    case .sidebar: .list
    case .list, .detail: .detail
    }
  }

  var previous: SplitViewColumn? {
    switch self {
    case .sidebar: nil
    case .list: .sidebar
    case .detail: .list
    }
  }

  var order: Int {
    switch self {
    case .sidebar: 0
    case .list: 1
    case .detail: 2
    }
  }

  var weight: CGFloat {
    switch self {
    case .sidebar: 20
    case .list: 32
    case .detail: 48
    }
  }
}

enum SplitViewMath {
  static let wideWidth: CGFloat = 768

  static func isWide(_ width: CGFloat) -> Bool {
    width >= wideWidth
  }

  static func backColumn(for kind: SplitViewColumn, present: [SplitViewColumn]) -> SplitViewColumn? {
    guard let previous = kind.previous else { return nil }
    return present.contains(previous) ? previous : nil
  }

  static func widths(total: CGFloat, present: [SplitViewColumn]) -> [SplitViewColumn: CGFloat] {
    let available = max(0, total - CGFloat(max(present.count - 1, 0)))
    let sum = present.reduce(0) { $0 + $1.weight }
    guard sum > 0 else { return [:] }
    var result: [SplitViewColumn: CGFloat] = [:]
    for column in present {
      result[column] = (available * column.weight / sum).rounded(.down)
    }
    return result
  }
}

struct SplitViewColumnKey: LayoutValueKey {
  static let defaultValue: SplitViewColumn? = nil
}

struct SplitViewColumnsLayout: Layout {
  func sizeThatFits(proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) -> CGSize {
    let width = proposal.width ?? SplitViewMath.wideWidth
    if let height = proposal.height { return CGSize(width: width, height: height) }
    let widths = columnWidths(total: width, subviews: subviews)
    let height = zip(subviews, widths).map { $0.sizeThatFits(ProposedViewSize(width: $1, height: nil)).height }.max() ?? 0
    return CGSize(width: width, height: height)
  }

  func placeSubviews(in bounds: CGRect, proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) {
    let widths = columnWidths(total: bounds.width, subviews: subviews)
    var x = bounds.minX
    for (subview, width) in zip(subviews, widths) {
      subview.place(
        at: CGPoint(x: x, y: bounds.minY),
        anchor: .topLeading,
        proposal: ProposedViewSize(width: width, height: bounds.height)
      )
      x += width + 1
    }
  }

  private func columnWidths(total: CGFloat, subviews: Subviews) -> [CGFloat] {
    let kinds = subviews.map { $0[SplitViewColumnKey.self] ?? .detail }
    let widths = SplitViewMath.widths(total: total, present: kinds)
    var result = kinds.map { widths[$0] ?? 0 }
    if !result.isEmpty {
      let used = result.dropLast().reduce(0, +) + CGFloat(result.count - 1)
      result[result.count - 1] = max(0, total - used)
    }
    return result
  }
}

struct SplitViewPaneInfo: Equatable {
  let kind: SplitViewColumn
  let title: Text?
}

struct SplitViewPanesKey: PreferenceKey {
  static var defaultValue: [SplitViewPaneInfo] { [] }

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

struct SplitViewContext: @unchecked Sendable {
  var wide = false
  var column: SplitViewColumn = .list
  var panes: [SplitViewPaneInfo] = []
  var forward = true
  var select: @MainActor @Sendable (SplitViewColumn) -> Void = { _ in }

  func title(_ kind: SplitViewColumn) -> Text? {
    panes.first { $0.kind == kind }?.title
  }
}

extension EnvironmentValues {
  @Entry var splitView: SplitViewContext? = nil
  @Entry var splitViewColumn: SplitViewColumn = .list
}

public struct SplitView<Content: View>: View {
  let external: Binding<SplitViewColumn>?
  let content: Content

  @State private var local: SplitViewColumn
  @State private var width: CGFloat = 0
  @State private var panes: [SplitViewPaneInfo] = []
  @State private var forward = true
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  public init(column: Binding<SplitViewColumn>, @ViewBuilder content: () -> Content) {
    self.external = column
    self._local = State(initialValue: column.wrappedValue)
    self.content = content()
  }

  public init(defaultColumn: SplitViewColumn = .list, @ViewBuilder content: () -> Content) {
    self.external = nil
    self._local = State(initialValue: defaultColumn)
    self.content = content()
  }

  public var body: some View {
    let binding = external ?? $local
    let current = binding.wrappedValue
    let wide = SplitViewMath.isWide(width)
    let animation: Animation? = reduceMotion ? nil : .timingCurve(0.32, 0.72, 0, 1, duration: 0.35)
    let context = SplitViewContext(
      wide: wide,
      column: current,
      panes: panes,
      forward: forward,
      select: { next in
        guard next != binding.wrappedValue else { return }
        forward = next.order > binding.wrappedValue.order
        if wide {
          binding.wrappedValue = next
        } else {
          withAnimation(animation) { binding.wrappedValue = next }
        }
      }
    )
    Group {
      if wide {
        SplitViewColumnsLayout { content }
      } else {
        ZStack(alignment: .topLeading) { content }
      }
    }
    .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .topLeading)
    .clipped()
    .environment(\.splitView, context)
    .onGeometryChange(for: CGFloat.self) { $0.size.width } action: { width = $0 }
    .onPreferenceChange(SplitViewPanesKey.self) { value in panes = value }
  }
}

struct SplitViewPane<Content: View>: View {
  let kind: SplitViewColumn
  let title: Text?
  let content: Content

  @Environment(\.splitView) private var splitView
  @Environment(\.layoutDirection) private var layoutDirection

  var body: some View {
    let context = splitView ?? SplitViewContext()
    Group {
      if context.wide {
        pane(context)
          .frame(maxHeight: .infinity, alignment: .top)
          .overlay(alignment: .leading) {
            if context.panes.first?.kind != kind {
              Color.separator.frame(width: 1).offset(x: -1)
            }
          }
          .layoutValue(key: SplitViewColumnKey.self, value: kind)
      } else if context.column == kind {
        pane(context)
          .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .top)
          .transition(
            .asymmetric(
              insertion: .move(edge: context.forward ? .trailing : .leading),
              removal: .move(edge: context.forward ? .leading : .trailing)
            )
          )
      } else {
        Color.clear
          .frame(width: 0, height: 0)
          .accessibilityHidden(true)
      }
    }
    .preference(key: SplitViewPanesKey.self, value: [SplitViewPaneInfo(kind: kind, title: title)])
  }

  private func pane(_ context: SplitViewContext) -> some View {
    let back = context.wide ? nil : SplitViewMath.backColumn(for: kind, present: context.panes.map(\.kind))
    return ScrollView {
      VStack(alignment: .leading, spacing: 0) {
        if let back {
          Button {
            context.select(back)
          } label: {
            HStack(spacing: 2) {
              Ph.caretLeft.bold
                .frame(width: 18, height: 18)
                .flipsForRightToLeftLayoutDirection(true)
              if let title = context.title(back) {
                title.lineLimit(1)
              } else {
                Text("Back")
              }
            }
            .scaledFont(.base)
            .foregroundStyle(Color.link)
            .frame(minHeight: 44)
            .contentShape(Rectangle())
          }
          .buttonStyle(SplitViewBackStyle())
          .padding(.leading, -6)
        }
        if let title {
          heading(title, wide: context.wide)
        }
        VStack(alignment: .leading, spacing: 0) {
          content
        }
        .padding(.top, context.wide ? 0 : -1)
        .clipped()
        .environment(\.splitViewColumn, kind)
      }
      .padding(padding(wide: context.wide))
      .frame(maxWidth: .infinity, alignment: .leading)
    }
  }

  @ViewBuilder
  private func heading(_ title: Text, wide: Bool) -> some View {
    if !wide {
      title
        .scaledFont(.xl3, weight: .bold)
        .foregroundStyle(Color.label)
        .padding(.bottom, 8)
        .accessibilityAddTraits(.isHeader)
    } else {
      switch kind {
      case .sidebar:
        title
          .scaledFont(.xs, weight: .semibold)
          .foregroundStyle(Color.labelSecondary)
          .padding(.horizontal, 12)
          .padding(.top, 12)
          .padding(.bottom, 8)
          .accessibilityAddTraits(.isHeader)
      case .list:
        title
          .frame(width: 0, height: 0)
          .opacity(0)
          .accessibilityAddTraits(.isHeader)
      case .detail:
        title
          .scaledFont(.xl, weight: .semibold)
          .foregroundStyle(Color.label)
          .padding(.bottom, 4)
          .accessibilityAddTraits(.isHeader)
      }
    }
  }

  private func padding(wide: Bool) -> EdgeInsets {
    guard wide else { return EdgeInsets(top: 0, leading: 16, bottom: 16, trailing: 16) }
    switch kind {
    case .sidebar: return EdgeInsets(top: 4, leading: 12, bottom: 12, trailing: 12)
    case .list: return EdgeInsets(top: 12, leading: 12, bottom: 12, trailing: 12)
    case .detail: return EdgeInsets(top: 32, leading: 32, bottom: 32, trailing: 32)
    }
  }
}

private struct SplitViewBackStyle: ButtonStyle {
  func makeBody(configuration: Configuration) -> some View {
    configuration.label.opacity(configuration.isPressed ? 0.6 : 1)
  }
}

public struct SplitViewSidebar<Content: View>: View {
  let title: Text?
  let content: Content

  public init(_ title: LocalizedStringKey? = nil, @ViewBuilder content: () -> Content) {
    self.title = title.map { Text($0) }
    self.content = content()
  }

  public init(verbatim title: String, @ViewBuilder content: () -> Content) {
    self.title = Text(verbatim: title)
    self.content = content()
  }

  public var body: some View {
    SplitViewPane(kind: .sidebar, title: title, content: content)
  }
}

public struct SplitViewList<Content: View>: View {
  let title: Text?
  let content: Content

  public init(_ title: LocalizedStringKey? = nil, @ViewBuilder content: () -> Content) {
    self.title = title.map { Text($0) }
    self.content = content()
  }

  public init(verbatim title: String, @ViewBuilder content: () -> Content) {
    self.title = Text(verbatim: title)
    self.content = content()
  }

  public var body: some View {
    SplitViewPane(kind: .list, title: title, content: content)
  }
}

public struct SplitViewDetail<Content: View>: View {
  let title: Text?
  let content: Content

  public init(_ title: LocalizedStringKey? = nil, @ViewBuilder content: () -> Content) {
    self.title = title.map { Text($0) }
    self.content = content()
  }

  public init(verbatim title: String, @ViewBuilder content: () -> Content) {
    self.title = Text(verbatim: title)
    self.content = content()
  }

  public var body: some View {
    SplitViewPane(kind: .detail, title: title, content: content)
  }
}

public struct SplitViewItem<Label: View>: View {
  let isActive: Bool
  let action: (() -> Void)?
  let label: Label

  @Environment(\.splitView) private var splitView
  @Environment(\.splitViewColumn) private var kind

  public init(isActive: Bool = false, action: (() -> Void)? = nil, @ViewBuilder label: () -> Label) {
    self.isActive = isActive
    self.action = action
    self.label = label()
  }

  public var body: some View {
    let wide = splitView?.wide ?? false
    Button {
      action?()
      splitView?.select(kind.next)
    } label: {
      HStack(spacing: 12) {
        VStack(alignment: .leading, spacing: 2) {
          label
        }
        .scaledFont(.base)
        .frame(maxWidth: .infinity, alignment: .leading)
        if !wide && kind != .detail {
          Ph.caretRight.regular
            .frame(width: 16, height: 16)
            .foregroundStyle(Color.labelTertiary)
            .flipsForRightToLeftLayoutDirection(true)
            .accessibilityHidden(true)
        }
      }
    }
    .buttonStyle(SplitViewItemStyle(wide: wide, kind: kind, active: isActive))
    .accessibilityAddTraits(isActive ? .isSelected : [])
  }
}

private struct SplitViewItemStyle: ButtonStyle {
  let wide: Bool
  let kind: SplitViewColumn
  let active: Bool

  @Environment(\.isEnabled) private var isEnabled

  func makeBody(configuration: Configuration) -> some View {
    let pressed = configuration.isPressed && isEnabled
    if wide {
      let shape = RoundedRectangle(cornerRadius: kind == .list ? Radius.xl : Radius.lg, style: .continuous)
      configuration.label
        .foregroundStyle(isEnabled ? Color.label : .labelQuaternary)
        .padding(.horizontal, 12)
        .padding(.vertical, kind == .list ? 12 : 8)
        .frame(maxWidth: .infinity, alignment: .leading)
        .background(pressed ? Color.itemPressed : active ? .itemSelected : .clear, in: shape)
        .contentShape(shape)
    } else {
      configuration.label
        .foregroundStyle(isEnabled ? Color.label : .labelQuaternary)
        .padding(.vertical, 12)
        .frame(maxWidth: .infinity, minHeight: 44, alignment: .leading)
        .background(pressed ? Color.itemPressed : .clear)
        .overlay(alignment: .top) {
          Color.separator.frame(height: 1)
        }
        .contentShape(Rectangle())
    }
  }
}
```

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/InboxSupport.kt"
package com.esuiss.ui.blocks

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.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.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.key
import androidx.compose.runtime.mutableStateListOf
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.graphics.Color
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.graphics.lerp
import androidx.compose.ui.graphics.vector.ImageVector
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.heading
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.input.KeyboardCapitalization
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.Dp
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.Regular
import com.adamglin.phosphoricons.bold.Check as BoldCheck
import com.adamglin.phosphoricons.regular.ChatCircle
import com.adamglin.phosphoricons.regular.Check
import com.adamglin.phosphoricons.regular.Tray
import com.esuiss.ui.components.Button
import com.esuiss.ui.components.ButtonSize
import com.esuiss.ui.components.ButtonVariant
import com.esuiss.ui.components.Icon
import com.esuiss.ui.components.Screen
import com.esuiss.ui.components.Textarea
import com.esuiss.ui.components.ToggleGroup
import com.esuiss.ui.components.ToggleGroupItem
import com.esuiss.ui.components.ToggleSize
import com.esuiss.ui.interactions.SwipeAction
import com.esuiss.ui.interactions.SwipeActions
import com.esuiss.ui.patterns.SplitView
import com.esuiss.ui.patterns.SplitViewColumn
import com.esuiss.ui.patterns.SplitViewItem
import com.esuiss.ui.theme.Colors
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

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

private class SupportTicket(
    val id: String,
    val title: String,
    val device: String,
    status: String,
    val priority: String,
    val requester: String,
    val hue: Int,
) {
    var status by mutableStateOf(status)
}

private fun supportTickets() = listOf(
    SupportTicket("#4821", "Screen flickers", "Phone Pro", "Open", "High", "Jamie Rivera", 30),
    SupportTicket("#4820", "Battery drains fast", "Book Air", "Pending", "Medium", "Morgan Lee", 200),
    SupportTicket("#4819", "Pods won't pair", "Pods Studio", "Open", "Low", "Avery Brooks", 330),
    SupportTicket("#4818", "Cloud backup error", "Phone Air", "Solved", "Medium", "Taylor Kim", 120),
)

private class SupportView(val value: String, val icon: ImageVector)

private val SupportViews = listOf(
    SupportView("Open", PhosphorIcons.Regular.ChatCircle),
    SupportView("Pending", PhosphorIcons.Regular.ChatCircle),
    SupportView("Solved", PhosphorIcons.Regular.Check),
    SupportView("All", PhosphorIcons.Regular.Tray),
)

private val TicketStatuses = listOf("Open", "Pending", "Solved")

private fun requesterTint(colors: Colors, hue: Int): Color = when (hue) {
    30 -> colors.orange
    200 -> colors.blue
    330 -> colors.pink
    else -> colors.green
}

private fun priorityColors(colors: Colors, priority: String): Pair<Color, Color> = when (priority) {
    "High" -> colors.dangerSurface to if (colors.isDark) colors.danger else lerp(colors.danger, colors.label, 0.3f)
    "Medium" -> colors.warningSurface to if (colors.isDark) colors.orange else lerp(colors.orange, colors.label, 0.5f)
    else -> colors.control to colors.labelSecondary
}

@Composable
fun InboxSupport(
    modifier: Modifier = Modifier,
    onViewChange: (view: String) -> Unit = {},
    onStatusChange: (id: String, status: String) -> Unit = { _, _ -> },
    onReply: (id: String, text: String) -> Unit = { _, _ -> },
) {
    val colors = EsuissTheme.colors
    val tickets = remember { mutableStateListOf<SupportTicket>().apply { addAll(supportTickets()) } }
    var view by rememberSaveable { mutableStateOf("Open") }
    var selected by rememberSaveable { mutableStateOf("#4821") }
    var column by rememberSaveable { mutableStateOf(SplitViewColumn.List) }
    val list = tickets.filter { view == "All" || it.status == view }
    val current = tickets.firstOrNull { it.id == selected }

    fun setStatus(ticket: SupportTicket, status: String) {
        if (ticket.status == status) return
        onStatusChange(ticket.id, status)
        ticket.status = status
    }

    Screen(modifier) {
        SplitView(column = column, onColumnChange = { column = it }) {
            SplitViewSidebar(title = "Support") {
                SupportViews.forEach { item ->
                    SplitViewItem(
                        isActive = view == item.value,
                        onClick = {
                            onViewChange(item.value)
                            view = item.value
                        },
                    ) {
                        Row(horizontalArrangement = Arrangement.spacedBy(10.dp), verticalAlignment = Alignment.CenterVertically) {
                            Icon(item.icon, contentDescription = null, size = 18.dp, tint = colors.accent)
                            BasicText(item.value, modifier = Modifier.weight(1f), style = Typography.base.copy(color = colors.label))
                            val count = if (item.value == "All") tickets.size else tickets.count { it.status == item.value }
                            BasicText("$count", style = Typography.xs.copy(color = colors.labelSecondary, fontFeatureSettings = "tnum"))
                        }
                    }
                }
            }
            SplitViewList(title = view) {
                list.forEach { ticket ->
                    key(ticket.id) {
                        SwipeActions(
                            trailing = if (ticket.status == "Solved") {
                                emptyList()
                            } else {
                                listOf(
                                    SwipeAction(
                                        label = "Mark as solved",
                                        onClick = { setStatus(ticket, "Solved") },
                                        icon = PhosphorIcons.Bold.BoldCheck,
                                        fullSwipe = true,
                                    ),
                                )
                            },
                        ) {
                            TicketRow(ticket, active = ticket.id == selected) { selected = ticket.id }
                        }
                    }
                }
                if (list.isEmpty()) {
                    BasicText(
                        "No tickets",
                        modifier = Modifier
                            .fillMaxWidth()
                            .padding(24.dp),
                        style = Typography.sm.copy(color = colors.labelSecondary, textAlign = TextAlign.Center),
                    )
                }
            }
            SplitViewDetail {
                if (current != null) {
                    key(current.id) {
                        TicketDetail(
                            ticket = current,
                            onStatus = { setStatus(current, it) },
                            onReply = { onReply(current.id, it) },
                        )
                    }
                }
            }
        }
    }
}

@Composable
private fun TicketRow(ticket: SupportTicket, active: Boolean, onClick: () -> Unit) {
    val colors = EsuissTheme.colors
    val (fill, ink) = priorityColors(colors, ticket.priority)
    SplitViewItem(isActive = active, onClick = onClick) {
        Column(verticalArrangement = Arrangement.spacedBy(4.dp)) {
            Row(horizontalArrangement = Arrangement.spacedBy(8.dp), verticalAlignment = Alignment.CenterVertically) {
                BasicText(
                    "${ticket.id} · ${ticket.device}",
                    modifier = Modifier.weight(1f),
                    style = Typography.xs.copy(color = colors.labelSecondary),
                )
                BasicText(
                    ticket.priority,
                    modifier = Modifier
                        .background(fill, RoundedCornerShape(Radius.md))
                        .padding(horizontal = 8.dp, vertical = 2.dp),
                    style = Typography.xs3.copy(color = ink, fontWeight = FontWeight.SemiBold),
                )
            }
            BasicText(ticket.title, style = Typography.base.copy(color = colors.label, fontWeight = FontWeight.SemiBold))
            Row(
                modifier = Modifier.padding(top = 4.dp),
                horizontalArrangement = Arrangement.spacedBy(6.dp),
                verticalAlignment = Alignment.CenterVertically,
            ) {
                TicketRequester(ticket, 18.dp)
                BasicText(ticket.requester, style = Typography.xs.copy(color = colors.labelSecondary))
            }
        }
    }
}

@Composable
private fun TicketRequester(ticket: SupportTicket, size: Dp) {
    val colors = EsuissTheme.colors
    Box(
        Modifier
            .size(size)
            .background(requesterTint(colors, ticket.hue), CircleShape),
        contentAlignment = Alignment.Center,
    ) {
        BasicText(
            ticket.requester.split(" ").mapNotNull { it.firstOrNull() }.joinToString(""),
            style = Typography.xs.copy(color = colors.onMedia, fontWeight = FontWeight.Medium, fontSize = (size.value * 0.4f).sp),
        )
    }
}

@Composable
private fun TicketDetail(ticket: SupportTicket, onStatus: (String) -> Unit, onReply: (String) -> Unit) {
    val colors = EsuissTheme.colors
    var reply by rememberSaveable { mutableStateOf("") }
    val appear = remember { Animatable(0f) }
    LaunchedEffect(Unit) { appear.animateTo(1f, tween(800, easing = TicketRevealEasing)) }
    Column(
        modifier = Modifier
            .fillMaxWidth()
            .padding(top = 8.dp)
            .graphicsLayer {
                alpha = appear.value
                translationY = (1f - appear.value) * 8.dp.toPx()
            },
        verticalArrangement = Arrangement.spacedBy(16.dp),
    ) {
        BasicText("${ticket.id} · ${ticket.device}", style = Typography.sm.copy(color = colors.labelSecondary))
        ToggleGroup(
            value = ticket.status,
            onValueChange = { if (it != null) onStatus(it) },
            modifier = Modifier.semantics { contentDescription = "Status" },
            size = ToggleSize.Sm,
            spacing = 0,
        ) {
            TicketStatuses.forEach { ToggleGroupItem(it, it) }
        }
        BasicText(
            ticket.title,
            modifier = Modifier.semantics { heading() },
            style = Typography.xl2.copy(color = colors.label, fontWeight = FontWeight.SemiBold),
        )
        Row(horizontalArrangement = Arrangement.spacedBy(10.dp), verticalAlignment = Alignment.CenterVertically) {
            TicketRequester(ticket, 34.dp)
            Column {
                BasicText(ticket.requester, style = Typography.sm.copy(color = colors.label, fontWeight = FontWeight.SemiBold))
                BasicText("Today 8:12 AM", style = Typography.xs.copy(color = colors.labelSecondary))
            }
        }
        BasicText(
            "Hi, this started right after the latest update. I tried restarting but it keeps happening. Can you help?",
            modifier = Modifier
                .widthIn(max = 520.dp)
                .background(colors.surfaceSecondary, RoundedCornerShape(topStart = 4.dp, topEnd = 16.dp, bottomEnd = 16.dp, bottomStart = 16.dp))
                .padding(horizontal = 14.dp, vertical = 12.dp),
            style = Typography.base.copy(color = colors.label, lineHeight = 26.sp),
        )
        Column(verticalArrangement = Arrangement.spacedBy(10.dp)) {
            Textarea(
                value = reply,
                onValueChange = { reply = it },
                modifier = Modifier.semantics { contentDescription = "Reply" },
                placeholder = "Write a reply…",
                minLines = 3,
                keyboardOptions = KeyboardOptions(capitalization = KeyboardCapitalization.Sentences),
            )
            Row(horizontalArrangement = Arrangement.spacedBy(10.dp)) {
                Button(
                    text = "Send and set pending",
                    onClick = {
                        onReply(reply.trim())
                        reply = ""
                        onStatus("Pending")
                    },
                    size = ButtonSize.Sm,
                    enabled = reply.isNotBlank(),
                )
                Button(text = "Mark as solved", onClick = { onStatus("Solved") }, size = ButtonSize.Sm, variant = ButtonVariant.Outline)
            }
        }
    }
}
```

```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/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/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/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/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/Textarea.kt"
package com.esuiss.ui.components

import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsFocusedAsState
import androidx.compose.foundation.layout.Box
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.foundation.text.BasicTextField
import androidx.compose.foundation.text.KeyboardActions
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.foundation.text.selection.LocalTextSelectionColors
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.graphics.SolidColor
import androidx.compose.ui.semantics.error
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

@Composable
fun Textarea(
    value: String,
    onValueChange: (String) -> Unit,
    modifier: Modifier = Modifier,
    enabled: Boolean = LocalFieldState.current.enabled,
    readOnly: Boolean = false,
    invalid: Boolean = LocalFieldState.current.invalid,
    placeholder: String? = null,
    minLines: Int = 1,
    maxLines: Int = Int.MAX_VALUE,
    keyboardOptions: KeyboardOptions = KeyboardOptions.Default,
    keyboardActions: KeyboardActions = KeyboardActions.Default,
    interactionSource: MutableInteractionSource? = null,
) {
    val colors = EsuissTheme.colors
    val source = interactionSource ?: remember { MutableInteractionSource() }
    val focused by source.collectIsFocusedAsState()
    val shape = RoundedCornerShape(Radius.xl)
    val textStyle = Typography.base.copy(color = if (enabled) colors.label else colors.labelQuaternary)
    CompositionLocalProvider(LocalTextSelectionColors provides formSelectionColors(colors)) {
        BasicTextField(
            value = value,
            onValueChange = onValueChange,
            modifier = modifier
                .fillMaxWidth()
                .heightIn(min = 64.dp)
                .formInputSurface(colors, shape, focused, invalid, enabled)
                .then(if (invalid) Modifier.semantics { error("Invalid") } else Modifier),
            enabled = enabled,
            readOnly = readOnly,
            textStyle = textStyle,
            keyboardOptions = keyboardOptions,
            keyboardActions = keyboardActions,
            singleLine = false,
            minLines = minLines,
            maxLines = maxLines,
            interactionSource = source,
            cursorBrush = SolidColor(colors.accent),
            decorationBox = { inner ->
                Box(
                    modifier = Modifier.padding(12.dp),
                    contentAlignment = Alignment.TopStart,
                ) {
                    if (value.isEmpty() && placeholder != null) {
                        BasicText(
                            placeholder,
                            style = textStyle.copy(color = if (enabled) colors.labelSecondary else colors.labelQuaternary),
                        )
                    }
                    inner()
                }
            },
        )
    }
}
```

```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/interactions/SwipeActions.kt"
package com.esuiss.ui.interactions

import androidx.compose.animation.core.Animatable
import androidx.compose.animation.core.animateFloatAsState
import androidx.compose.animation.core.tween
import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.gestures.AnchoredDraggableDefaults
import androidx.compose.foundation.gestures.AnchoredDraggableState
import androidx.compose.foundation.gestures.DraggableAnchors
import androidx.compose.foundation.gestures.Orientation
import androidx.compose.foundation.gestures.anchoredDraggable
import androidx.compose.foundation.gestures.animateTo
import androidx.compose.foundation.gestures.detectTapGestures
import androidx.compose.foundation.gestures.snapTo
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.fillMaxWidth
import androidx.compose.foundation.layout.offset
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.DisposableEffect
import androidx.compose.runtime.Immutable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.SideEffect
import androidx.compose.runtime.Stable
import androidx.compose.runtime.State
import androidx.compose.runtime.derivedStateOf
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.runtime.rememberUpdatedState
import androidx.compose.runtime.setValue
import androidx.compose.runtime.snapshotFlow
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clipToBounds
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.compositeOver
import androidx.compose.ui.graphics.lerp
import androidx.compose.ui.graphics.vector.ImageVector
import androidx.compose.ui.hapticfeedback.HapticFeedbackType
import androidx.compose.ui.input.pointer.pointerInput
import androidx.compose.ui.layout.Layout
import androidx.compose.ui.layout.layout
import androidx.compose.ui.layout.onSizeChanged
import androidx.compose.ui.platform.LocalLayoutDirection
import androidx.compose.ui.semantics.CustomAccessibilityAction
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.clearAndSetSemantics
import androidx.compose.ui.semantics.customActions
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.Constraints
import androidx.compose.ui.unit.IntOffset
import androidx.compose.ui.unit.LayoutDirection
import androidx.compose.ui.unit.dp
import com.esuiss.ui.components.FormEasing
import com.esuiss.ui.components.Icon
import com.esuiss.ui.components.formReducedMotion
import com.esuiss.ui.components.rememberHaptics
import com.esuiss.ui.theme.Colors
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.delay
import kotlinx.coroutines.flow.first
import kotlinx.coroutines.launch
import kotlin.math.abs
import kotlin.math.roundToInt
import kotlinx.coroutines.flow.drop
import kotlinx.coroutines.flow.filter

enum class SwipeActionsSide { Leading, Trailing }

enum class SwipeActionVariant { Default, Destructive, Archive, Neutral }

@Immutable
class SwipeAction(
    val label: String,
    val onClick: () -> Unit,
    val icon: ImageVector? = null,
    val variant: SwipeActionVariant = SwipeActionVariant.Default,
    val fullSwipe: Boolean = false,
)

internal enum class SwipeActionsValue { Closed, Leading, Trailing, LeadingFull, TrailingFull }

private val SwipeSpec = tween<Float>(300, easing = FormEasing)

@Stable
class SwipeActionsState internal constructor() {
    internal val anchored = AnchoredDraggableState(SwipeActionsValue.Closed)
    internal var scope: CoroutineScope? = null
    internal var reduced = false

    val openSide: SwipeActionsSide?
        get() = when (anchored.currentValue) {
            SwipeActionsValue.Leading, SwipeActionsValue.LeadingFull -> SwipeActionsSide.Leading
            SwipeActionsValue.Trailing, SwipeActionsValue.TrailingFull -> SwipeActionsSide.Trailing
            SwipeActionsValue.Closed -> null
        }

    suspend fun close() = moveTo(SwipeActionsValue.Closed)

    suspend fun open(side: SwipeActionsSide) =
        moveTo(if (side == SwipeActionsSide.Leading) SwipeActionsValue.Leading else SwipeActionsValue.Trailing)

    internal fun requestClose() {
        scope?.launch { close() }
    }

    private suspend fun moveTo(target: SwipeActionsValue) {
        if (anchored.anchors.size == 0) snapshotFlow { anchored.anchors.size }.first { it > 0 }
        if (!anchored.anchors.hasPositionFor(target)) return
        if (reduced) anchored.snapTo(target) else anchored.animateTo(target, SwipeSpec)
    }
}

@Composable
fun rememberSwipeActionsState(): SwipeActionsState = remember { SwipeActionsState() }

private object SwipeActionsRegistry {
    var open: SwipeActionsState? = null

    fun claim(state: SwipeActionsState) {
        val previous = open
        open = state
        if (previous != null && previous !== state) previous.requestClose()
    }

    fun release(state: SwipeActionsState) {
        if (open === state) open = null
    }
}

@Composable
fun SwipeActions(
    modifier: Modifier = Modifier,
    leading: List<SwipeAction> = emptyList(),
    trailing: List<SwipeAction> = emptyList(),
    state: SwipeActionsState = rememberSwipeActionsState(),
    enabled: Boolean = true,
    background: Color = EsuissTheme.colors.surface,
    content: @Composable () -> Unit,
) {
    val rtl = LocalLayoutDirection.current == LayoutDirection.Rtl
    val reduced = formReducedMotion()
    val scope = rememberCoroutineScope()
    SideEffect {
        state.scope = scope
        state.reduced = reduced
    }
    DisposableEffect(state) {
        onDispose { SwipeActionsRegistry.release(state) }
    }
    var rowWidth by remember { mutableIntStateOf(0) }
    var leadingWidth by remember { mutableIntStateOf(0) }
    var trailingWidth by remember { mutableIntStateOf(0) }
    var removing by remember { mutableStateOf(false) }
    val removal = remember { Animatable(1f) }
    val leadingFull = leading.any { it.fullSwipe }
    val trailingFull = trailing.any { it.fullSwipe }
    val currentLeading by rememberUpdatedState(leading)
    val currentTrailing by rememberUpdatedState(trailing)
    val hasLeading = leading.isNotEmpty()
    val hasTrailing = trailing.isNotEmpty()

    LaunchedEffect(rowWidth, leadingWidth, trailingWidth, hasLeading, hasTrailing, leadingFull, trailingFull) {
        if (rowWidth == 0) return@LaunchedEffect
        val anchors = DraggableAnchors {
            SwipeActionsValue.Closed at 0f
            if (hasLeading && leadingWidth > 0) {
                SwipeActionsValue.Leading at leadingWidth.toFloat()
                if (leadingFull && rowWidth > leadingWidth) SwipeActionsValue.LeadingFull at rowWidth.toFloat()
            }
            if (hasTrailing && trailingWidth > 0) {
                SwipeActionsValue.Trailing at -trailingWidth.toFloat()
                if (trailingFull && rowWidth > trailingWidth) SwipeActionsValue.TrailingFull at -rowWidth.toFloat()
            }
        }
        val target = state.anchored.targetValue
        state.anchored.updateAnchors(anchors, if (anchors.hasPositionFor(target)) target else SwipeActionsValue.Closed)
    }

    LaunchedEffect(state) {
        snapshotFlow { state.anchored.settledValue }.collect { value ->
            when (value) {
                SwipeActionsValue.Closed -> SwipeActionsRegistry.release(state)
                SwipeActionsValue.Leading, SwipeActionsValue.Trailing -> SwipeActionsRegistry.claim(state)
                SwipeActionsValue.LeadingFull, SwipeActionsValue.TrailingFull -> {
                    SwipeActionsRegistry.release(state)
                    val actions = if (value == SwipeActionsValue.LeadingFull) currentLeading else currentTrailing
                    val action = actions.firstOrNull { it.fullSwipe }
                    removing = true
                    if (!state.reduced) {
                        delay(180)
                        removal.animateTo(0f, tween(220, easing = FormEasing))
                    }
                    action?.onClick?.invoke()
                    delay(50)
                    state.anchored.snapTo(SwipeActionsValue.Closed)
                    removal.snapTo(1f)
                    removing = false
                }
            }
        }
    }

    val offsetState = remember(state) {
        derivedStateOf { state.anchored.offset.let { if (it.isNaN()) 0f else it } }
    }
    val fullSide by remember(state) {
        derivedStateOf {
            val anchors = state.anchored.anchors
            val offset = offsetState.value
            when {
                offset > 0f && anchors.hasPositionFor(SwipeActionsValue.LeadingFull) -> {
                    val open = anchors.positionOf(SwipeActionsValue.Leading)
                    val full = anchors.positionOf(SwipeActionsValue.LeadingFull)
                    if (offset > (open + full) / 2f) SwipeActionsSide.Leading else null
                }
                offset < 0f && anchors.hasPositionFor(SwipeActionsValue.TrailingFull) -> {
                    val open = anchors.positionOf(SwipeActionsValue.Trailing)
                    val full = anchors.positionOf(SwipeActionsValue.TrailingFull)
                    if (offset < (open + full) / 2f) SwipeActionsSide.Trailing else null
                }
                else -> null
            }
        }
    }
    val currentHaptics by rememberUpdatedState(rememberHaptics())
    LaunchedEffect(state) {
        snapshotFlow { fullSide }
            .drop(1)
            .filter { it != null }
            .collect { currentHaptics.perform(HapticFeedbackType.GestureThresholdActivate) }
    }
    val fullProgress = animateFloatAsState(
        targetValue = if (fullSide != null) 1f else 0f,
        animationSpec = if (reduced) tween(0) else tween(200, easing = FormEasing),
        label = "full",
    )
    val revealedSide by remember(state) {
        derivedStateOf {
            val offset = offsetState.value
            when {
                offset > 0.5f -> SwipeActionsSide.Leading
                offset < -0.5f -> SwipeActionsSide.Trailing
                else -> null
            }
        }
    }
    val isOpen = revealedSide != null
    val accessibilityActions = remember(leading, trailing) {
        (leading + trailing).map { action ->
            CustomAccessibilityAction(action.label) {
                action.onClick()
                true
            }
        }
    }

    Box(
        modifier = modifier
            .fillMaxWidth()
            .onSizeChanged { rowWidth = it.width }
            .layout { measurable, constraints ->
                val placeable = measurable.measure(constraints)
                val height = (placeable.height * removal.value).roundToInt()
                layout(placeable.width, height) { placeable.place(0, 0) }
            }
            .clipToBounds()
            .anchoredDraggable(
                state = state.anchored,
                orientation = Orientation.Horizontal,
                enabled = enabled && !removing,
                reverseDirection = rtl,
                flingBehavior = AnchoredDraggableDefaults.flingBehavior(
                    state = state.anchored,
                    positionalThreshold = { it * 0.5f },
                    animationSpec = SwipeSpec,
                ),
            ),
    ) {
        if (hasLeading) {
            SwipeActionsStrip(
                actions = leading,
                side = SwipeActionsSide.Leading,
                offset = offsetState,
                fullProgress = fullProgress,
                fullActive = fullSide == SwipeActionsSide.Leading,
                visible = revealedSide == SwipeActionsSide.Leading,
                onNaturalWidth = { leadingWidth = it },
                onAction = { state.requestClose() },
                modifier = Modifier.matchParentSize(),
            )
        }
        if (hasTrailing) {
            SwipeActionsStrip(
                actions = trailing,
                side = SwipeActionsSide.Trailing,
                offset = offsetState,
                fullProgress = fullProgress,
                fullActive = fullSide == SwipeActionsSide.Trailing,
                visible = revealedSide == SwipeActionsSide.Trailing,
                onNaturalWidth = { trailingWidth = it },
                onAction = { state.requestClose() },
                modifier = Modifier.matchParentSize(),
            )
        }
        Box(
            modifier = Modifier
                .fillMaxWidth()
                .offset { IntOffset(offsetState.value.roundToInt(), 0) }
                .background(background)
                .pointerInput(Unit) {}
                .semantics(mergeDescendants = true) {
                    if (enabled) customActions = accessibilityActions
                },
        ) {
            content()
            if (isOpen) {
                Box(
                    modifier = Modifier
                        .matchParentSize()
                        .clearAndSetSemantics {}
                        .pointerInput(state) {
                            detectTapGestures { state.requestClose() }
                        },
                )
            }
        }
    }
}

internal fun swipeActionColor(variant: SwipeActionVariant, colors: Colors): Color = when (variant) {
    SwipeActionVariant.Default -> colors.accent
    SwipeActionVariant.Destructive -> if (colors.isDark) lerp(colors.danger, colors.surface, 0.3f) else colors.danger
    SwipeActionVariant.Archive -> if (colors.isDark) lerp(colors.purple, colors.surface, 0.3f) else lerp(colors.purple, colors.label, 0.15f)
    SwipeActionVariant.Neutral -> if (colors.isDark) lerp(colors.gray, colors.surface, 0.4f) else lerp(colors.gray, colors.label, 0.35f)
}

@Composable
private fun SwipeActionsStrip(
    actions: List<SwipeAction>,
    side: SwipeActionsSide,
    offset: State<Float>,
    fullProgress: State<Float>,
    fullActive: Boolean,
    visible: Boolean,
    onNaturalWidth: (Int) -> Unit,
    onAction: () -> Unit,
    modifier: Modifier,
) {
    val fullIndex = actions.indexOfFirst { it.fullSwipe }
    Layout(
        modifier = modifier.then(if (visible) Modifier else Modifier.clearAndSetSemantics {}),
        content = {
            actions.forEachIndexed { index, action ->
                SwipeActionButton(action, hidden = fullActive && index != fullIndex, onAction = onAction)
            }
        },
    ) { measurables, constraints ->
        val height = constraints.maxHeight
        val width = constraints.maxWidth
        val minimum = 72.dp.roundToPx()
        val natural = measurables.sumOf { maxOf(minimum, it.maxIntrinsicWidth(height)) }
        onNaturalWidth(natural)
        val raw = offset.value
        val revealed = (if (side == SwipeActionsSide.Leading) raw else -raw).coerceAtLeast(0f)
        val count = measurables.size
        val base = maxOf(minimum.toFloat(), revealed / count)
        val progress = if (fullIndex >= 0) fullProgress.value else 0f
        val widths = IntArray(count) { index ->
            val target = when {
                fullIndex < 0 -> base
                index == fullIndex -> base + (revealed - base) * progress
                else -> base * (1f - progress)
            }
            if (revealed <= 0f) 0 else target.roundToInt().coerceAtLeast(0)
        }
        val placeables = measurables.mapIndexed { index, measurable ->
            measurable.measure(Constraints.fixed(widths[index], height))
        }
        layout(width, height) {
            if (side == SwipeActionsSide.Trailing) {
                var x = width - revealed.roundToInt()
                placeables.forEachIndexed { index, placeable ->
                    val alpha = if (fullIndex >= 0 && index != fullIndex) 1f - progress else 1f
                    placeable.placeRelativeWithLayer(x, 0) { this.alpha = alpha }
                    x += placeable.width
                }
            } else {
                var x = revealed.roundToInt()
                placeables.forEachIndexed { index, placeable ->
                    x -= placeable.width
                    val alpha = if (fullIndex >= 0 && index != fullIndex) 1f - progress else 1f
                    placeable.placeRelativeWithLayer(x, 0) { this.alpha = alpha }
                }
            }
        }
    }
}

@Composable
private fun SwipeActionButton(action: SwipeAction, hidden: Boolean, onAction: () -> Unit) {
    val colors = EsuissTheme.colors
    val interaction = remember { MutableInteractionSource() }
    val pressed by interaction.collectIsPressedAsState()
    val base = swipeActionColor(action.variant, colors)
    val fill = if (pressed) Color.Black.copy(alpha = 0.12f).compositeOver(base) else base
    Column(
        modifier = Modifier
            .background(fill)
            .then(if (hidden) Modifier.clearAndSetSemantics {} else Modifier)
            .clickable(
                interactionSource = interaction,
                indication = null,
                role = Role.Button,
                onClick = {
                    action.onClick()
                    onAction()
                },
            )
            .padding(horizontal = 12.dp),
        horizontalAlignment = Alignment.CenterHorizontally,
        verticalArrangement = Arrangement.spacedBy(4.dp, Alignment.CenterVertically),
    ) {
        if (action.icon != null) Icon(action.icon, contentDescription = null, size = 20.dp, tint = colors.onAccent)
        BasicText(
            action.label,
            style = Typography.xs.copy(color = colors.onAccent, fontWeight = FontWeight.Medium, textAlign = TextAlign.Center),
            maxLines = 2,
        )
    }
}
```

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

import androidx.compose.animation.AnimatedContent
import androidx.compose.animation.core.tween
import androidx.compose.animation.fadeIn
import androidx.compose.animation.fadeOut
import androidx.compose.animation.slideInHorizontally
import androidx.compose.animation.slideOutHorizontally
import androidx.compose.animation.togetherWith
import androidx.compose.foundation.background
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.BoxWithConstraints
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.fillMaxHeight
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
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.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.Immutable
import androidx.compose.runtime.DisposableEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableFloatStateOf
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.runtime.staticCompositionLocalOf
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.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.layout.onPlaced
import androidx.compose.ui.layout.positionInRoot
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.heading
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.semantics.selected
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Bold
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.bold.CaretLeft
import com.adamglin.phosphoricons.regular.CaretRight
import com.esuiss.ui.components.Icon
import com.esuiss.ui.components.LocalContentColor
import com.esuiss.ui.components.LocalContentStyle
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography
import kotlin.math.abs

enum class SplitViewColumn { Sidebar, List, Detail }

private class SplitViewPane(
    val kind: SplitViewColumn,
    val title: String?,
    val modifier: Modifier,
    val content: @Composable ColumnScope.() -> Unit,
)

interface SplitViewScope {
    fun SplitViewSidebar(title: String? = null, modifier: Modifier = Modifier, content: @Composable ColumnScope.() -> Unit)

    fun SplitViewList(title: String? = null, modifier: Modifier = Modifier, content: @Composable ColumnScope.() -> Unit)

    fun SplitViewDetail(title: String? = null, modifier: Modifier = Modifier, content: @Composable ColumnScope.() -> Unit)
}

private class SplitViewScopeImpl : SplitViewScope {
    val panes = mutableListOf<SplitViewPane>()

    override fun SplitViewSidebar(title: String?, modifier: Modifier, content: @Composable ColumnScope.() -> Unit) {
        panes += SplitViewPane(SplitViewColumn.Sidebar, title, modifier, content)
    }

    override fun SplitViewList(title: String?, modifier: Modifier, content: @Composable ColumnScope.() -> Unit) {
        panes += SplitViewPane(SplitViewColumn.List, title, modifier, content)
    }

    override fun SplitViewDetail(title: String?, modifier: Modifier, content: @Composable ColumnScope.() -> Unit) {
        panes += SplitViewPane(SplitViewColumn.Detail, title, modifier, content)
    }
}

private class SplitViewItemEdges {
    val edges = mutableStateMapOf<Any, Pair<Float, Float>>()
}

@Immutable
private class SplitViewContext(
    val compact: Boolean,
    val kind: SplitViewColumn,
    val setColumn: (SplitViewColumn) -> Unit,
    val items: SplitViewItemEdges = SplitViewItemEdges(),
)

private val LocalSplitView = staticCompositionLocalOf<SplitViewContext?> { null }

private fun next(kind: SplitViewColumn): SplitViewColumn = when (kind) {
    SplitViewColumn.Sidebar -> SplitViewColumn.List
    SplitViewColumn.List, SplitViewColumn.Detail -> SplitViewColumn.Detail
}

private fun previous(kind: SplitViewColumn): SplitViewColumn? = when (kind) {
    SplitViewColumn.Sidebar -> null
    SplitViewColumn.List -> SplitViewColumn.Sidebar
    SplitViewColumn.Detail -> SplitViewColumn.List
}

private val WideBreakpoint = 768.dp

@Composable
fun SplitView(
    modifier: Modifier = Modifier,
    column: SplitViewColumn? = null,
    defaultColumn: SplitViewColumn = SplitViewColumn.List,
    onColumnChange: (SplitViewColumn) -> Unit = {},
    content: SplitViewScope.() -> Unit,
) {
    val panes = SplitViewScopeImpl().apply(content).panes.toList()
    var uncontrolled by rememberSaveable { mutableStateOf(defaultColumn) }
    val current = column ?: uncontrolled
    val setColumn: (SplitViewColumn) -> Unit = { nextColumn ->
        if (column == null) uncontrolled = nextColumn
        onColumnChange(nextColumn)
    }
    val titles = panes.associate { it.kind to it.title }
    BoxWithConstraints(modifier = modifier) {
        if (maxWidth >= WideBreakpoint) {
            WideSplitView(panes, setColumn)
        } else {
            AnimatedContent(
                targetState = current,
                transitionSpec = {
                    val forward = targetState.ordinal > initialState.ordinal
                    (slideInHorizontally(tween(300)) { if (forward) it / 3 else -it / 3 } + fadeIn(tween(300))) togetherWith
                        (slideOutHorizontally(tween(300)) { if (forward) -it / 3 else it / 3 } + fadeOut(tween(200)))
                },
                label = "splitView",
            ) { shown ->
                val pane = panes.firstOrNull { it.kind == shown }
                if (pane != null) {
                    val back = previous(pane.kind)?.takeIf { target ->
                        panes.any { it.kind == target } && !(target == SplitViewColumn.Sidebar && titles[target] == null)
                    }
                    CompactPane(pane, back, back?.let { titles[it] }, setColumn)
                }
            }
        }
    }
}

@Composable
private fun CompactPane(
    pane: SplitViewPane,
    back: SplitViewColumn?,
    backTitle: String?,
    setColumn: (SplitViewColumn) -> Unit,
) {
    val colors = EsuissTheme.colors
    CompositionLocalProvider(
        LocalSplitView provides SplitViewContext(compact = true, kind = pane.kind, setColumn = setColumn, items = remember { SplitViewItemEdges() }),
        LocalContentStyle provides Typography.base.copy(color = colors.label),
        LocalContentColor provides colors.label,
    ) {
        Column(
            modifier = pane.modifier
                .fillMaxSize()
                .verticalScroll(rememberScrollState())
                .padding(PaddingValues(horizontal = 16.dp, vertical = 8.dp)),
        ) {
            if (back != null) {
                val interaction = remember { MutableInteractionSource() }
                val pressed by interaction.collectIsPressedAsState()
                val tint = if (pressed) colors.link.copy(alpha = 0.6f) else colors.link
                Row(
                    modifier = Modifier
                        .heightIn(min = 44.dp)
                        .clickable(interactionSource = interaction, indication = null, role = Role.Button) { setColumn(back) },
                    verticalAlignment = Alignment.CenterVertically,
                    horizontalArrangement = Arrangement.spacedBy(2.dp),
                ) {
                    Icon(PhosphorIcons.Bold.CaretLeft, contentDescription = if (backTitle == null) "Back" else null, size = 18.dp, tint = tint)
                    if (backTitle != null) BasicText(backTitle, style = Typography.base.copy(color = tint))
                }
            }
            if (pane.title != null) {
                BasicText(
                    pane.title,
                    modifier = Modifier.padding(bottom = 8.dp).semantics { heading() },
                    style = Typography.xl2.copy(color = colors.label, fontWeight = FontWeight.Bold),
                )
            }
            pane.content(this)
        }
    }
}

@Composable
private fun WideSplitView(panes: List<SplitViewPane>, setColumn: (SplitViewColumn) -> Unit) {
    val colors = EsuissTheme.colors
    val weights = panes.map {
        when (it.kind) {
            SplitViewColumn.Sidebar -> 0.20f
            SplitViewColumn.List -> 0.32f
            SplitViewColumn.Detail -> 0.48f
        }
    }
    Row(modifier = Modifier.fillMaxSize()) {
        panes.forEachIndexed { index, pane ->
            if (index > 0) Box(modifier = Modifier.width(1.dp).fillMaxHeight().background(colors.separator))
            CompositionLocalProvider(
                LocalSplitView provides SplitViewContext(compact = false, kind = pane.kind, setColumn = setColumn),
                LocalContentStyle provides Typography.base.copy(color = colors.label),
                LocalContentColor provides colors.label,
            ) {
                Column(
                    modifier = Modifier
                        .weight(weights[index])
                        .fillMaxHeight()
                        .verticalScroll(rememberScrollState())
                        .then(pane.modifier)
                        .padding(
                            when (pane.kind) {
                                SplitViewColumn.Sidebar -> PaddingValues(start = 12.dp, end = 12.dp, top = 4.dp, bottom = 12.dp)
                                SplitViewColumn.List -> PaddingValues(12.dp)
                                SplitViewColumn.Detail -> PaddingValues(32.dp)
                            },
                        ),
                ) {
                    if (pane.title != null) {
                        when (pane.kind) {
                            SplitViewColumn.Sidebar -> BasicText(
                                pane.title,
                                modifier = Modifier.padding(start = 12.dp, end = 12.dp, top = 12.dp, bottom = 8.dp).semantics { heading() },
                                style = Typography.xs.copy(color = colors.labelSecondary, fontWeight = FontWeight.SemiBold),
                            )
                            SplitViewColumn.List -> Box(
                                modifier = Modifier.semantics {
                                    heading()
                                    contentDescription = pane.title
                                },
                            )
                            SplitViewColumn.Detail -> BasicText(
                                pane.title,
                                modifier = Modifier.padding(bottom = 4.dp).semantics { heading() },
                                style = Typography.xl2.copy(color = colors.label, fontWeight = FontWeight.SemiBold),
                            )
                        }
                    }
                    pane.content(this)
                }
            }
        }
    }
}

@Composable
fun SplitViewItem(
    modifier: Modifier = Modifier,
    isActive: Boolean = false,
    onClick: () -> Unit = {},
    content: @Composable ColumnScope.() -> Unit,
) {
    val context = LocalSplitView.current ?: SplitViewContext(compact = true, kind = SplitViewColumn.List, setColumn = {})
    val colors = EsuissTheme.colors
    val interaction = remember { MutableInteractionSource() }
    val pressed by interaction.collectIsPressedAsState()
    val id = remember { Any() }
    var top by remember { mutableFloatStateOf(Float.NaN) }
    val click = {
        onClick()
        context.setColumn(next(context.kind))
    }
    if (context.compact) {
        val separator = colors.separator
        val edges = context.items.edges
        DisposableEffect(edges) { onDispose { edges.remove(id) } }
        val divided = edges.any { (key, edge) -> key !== id && abs(edge.second - top) < 1f }
        Row(
            modifier = modifier
                .fillMaxWidth()
                .heightIn(min = 44.dp)
                .onPlaced {
                    val y = it.positionInRoot().y
                    top = y
                    edges[id] = y to y + it.size.height
                }
                .background(if (pressed) colors.itemPressed else Color.Transparent)
                .drawBehind { if (divided) drawRect(separator, Offset.Zero, Size(size.width, 1.dp.toPx())) }
                .clickable(interactionSource = interaction, indication = null, role = Role.Button, onClick = click)
                .semantics { selected = isActive }
                .padding(vertical = 12.dp),
            horizontalArrangement = Arrangement.spacedBy(12.dp),
            verticalAlignment = Alignment.CenterVertically,
        ) {
            Column(modifier = Modifier.weight(1f), verticalArrangement = Arrangement.spacedBy(2.dp), content = content)
            if (context.kind != SplitViewColumn.Detail) {
                Icon(PhosphorIcons.Regular.CaretRight, contentDescription = null, size = 16.dp, tint = colors.labelTertiary)
            }
        }
    } else {
        val list = context.kind == SplitViewColumn.List
        val shape = RoundedCornerShape(if (list) Radius.xl else Radius.lg)
        Row(
            modifier = modifier
                .fillMaxWidth()
                .clip(shape)
                .background(
                    when {
                        pressed -> colors.itemPressed
                        isActive -> colors.surfaceSecondary
                        else -> Color.Transparent
                    },
                    shape,
                )
                .clickable(interactionSource = interaction, indication = null, role = Role.Button, onClick = click)
                .semantics { selected = isActive }
                .padding(horizontal = 12.dp, vertical = if (list) 12.dp else 8.dp),
            horizontalArrangement = Arrangement.spacedBy(12.dp),
            verticalAlignment = Alignment.CenterVertically,
        ) {
            Column(modifier = Modifier.weight(1f), verticalArrangement = Arrangement.spacedBy(2.dp), content = content)
        }
    }
}
```

4. Update the `com.esuiss.ui` package names to match your project.

## Usage

```tsx
import { InboxSupport } from "@/components/blocks/inbox-support"
```

```tsx
<InboxSupport />
```

Replace `INITIAL_TICKETS` with your tickets. Wire `onViewChange`, `onStatusChange` and `onReply` to your help desk backend; the screen also updates its own ticket list.