# Image Viewer

A full-screen photo viewer with swipe paging, pinch and double-tap zoom, and swipe down to close.

Image Viewer is an open-source mobile interaction 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/interactions/image-viewer

![Preview](https://uim.suiss.app/previews/interactions-image-viewer--open-by-default.light.webp)

```tsx
import { Image, View } from "react-native"
import { ImageViewer, ImageViewerContent, type ImageViewerImage, ImageViewerTrigger } from "@/components/interactions/image-viewer"
import { Text } from "@/components/ui/text"

const images: ImageViewerImage[] = [
  {
    source: {
      uri: "https://images.unsplash.com/photo-1588345921523-c2dcdb7f1dcd?w=1200&q=80",
    },
    accessibilityLabel: "Mountain lake at sunrise",
  },
  {
    source: {
      uri: "https://images.unsplash.com/photo-1506744038136-46273834b3fb?w=1200&q=80",
    },
    accessibilityLabel: "Valley with a river",
  },
  {
    source: {
      uri: "https://images.unsplash.com/photo-1501785888041-af3ef285b470?w=1200&q=80",
    },
    accessibilityLabel: "Lake between mountains",
  },
  {
    source: {
      uri: "https://images.unsplash.com/photo-1470071459604-3b5ec3a7fe05?w=1200&q=80",
    },
    accessibilityLabel: "Foggy hills",
  },
  {
    source: {
      uri: "https://images.unsplash.com/photo-1441974231531-c6227db76b6e?w=1200&q=80",
    },
    accessibilityLabel: "Forest path",
  },
]

function Gallery({
  defaultOpen,
  defaultIndex,
}: {
  defaultOpen?: boolean
  defaultIndex?: number
}) {
  return (
    <ImageViewer
      images={images}
      defaultOpen={defaultOpen}
      defaultIndex={defaultIndex}
    >
      <View className="gap-3">
        <View className="flex-row flex-wrap gap-2">
          {images.map((image, index) => (
            <ImageViewerTrigger
              key={image.accessibilityLabel}
              index={index}
              accessibilityLabel={image.accessibilityLabel}
              className="aspect-square w-[31%] overflow-hidden rounded-xl bg-surface-secondary"
            >
              <Image source={image.source} className="h-full w-full" />
            </ImageViewerTrigger>
          ))}
        </View>
        <Text variant="muted">
          Tap a photo. Pinch or double-tap to zoom, swipe down to close.
        </Text>
      </View>
      <ImageViewerContent />
    </ImageViewer>
  )
}

export function ImageViewerOpenByDefaultExample() {
  return (
    <Gallery defaultOpen defaultIndex={1} />
  )
}
```

```swift
import EsuissUI
import SwiftUI
import UIKit

struct ImageViewerOpenByDefaultExample: View {
  var body: some View {
    ImageViewerGallery(open: true, index: 1)
  }
}

struct ImageViewerPhoto {
  let url: URL
  let label: String
}

let imageViewerPhotos = [
  ImageViewerPhoto(url: URL(string: "https://images.unsplash.com/photo-1588345921523-c2dcdb7f1dcd?w=1200&q=80")!, label: "Mountain lake at sunrise"),
  ImageViewerPhoto(url: URL(string: "https://images.unsplash.com/photo-1506744038136-46273834b3fb?w=1200&q=80")!, label: "Valley with a river"),
  ImageViewerPhoto(url: URL(string: "https://images.unsplash.com/photo-1501785888041-af3ef285b470?w=1200&q=80")!, label: "Lake between mountains"),
  ImageViewerPhoto(url: URL(string: "https://images.unsplash.com/photo-1470071459604-3b5ec3a7fe05?w=1200&q=80")!, label: "Foggy hills"),
  ImageViewerPhoto(url: URL(string: "https://images.unsplash.com/photo-1441974231531-c6227db76b6e?w=1200&q=80")!, label: "Forest path"),
]

struct ImageViewerGallery: View {
  @State private var open: Bool
  @State private var index: Int
  @State private var loaded: [Int: UIImage] = [:]

  init(open: Bool = false, index: Int = 0) {
    _open = State(initialValue: open)
    _index = State(initialValue: index)
  }

  var images: [Image] {
    imageViewerPhotos.indices.map { page in
      let photo = imageViewerPhotos[page]
      if let cgImage = loaded[page]?.cgImage {
        return Image(cgImage, scale: 1, orientation: .up, label: Text(verbatim: photo.label))
      }
      return Image(uiImage: UIImage())
    }
  }

  var body: some View {
    VStack(alignment: .leading, spacing: 12) {
      GeometryReader { proxy in
        let side = ((proxy.size.width - 16) / 3).rounded(.down)
        FlowRow(spacing: 8) {
          ForEach(imageViewerPhotos.indices, id: \.self) { page in
            Button {
              index = page
              open = true
            } label: {
              thumbnail(page)
                .frame(width: side, height: side)
                .background(Color.surfaceSecondary)
                .clipShape(RoundedRectangle(cornerRadius: Radius.xl, style: .continuous))
            }
            .buttonStyle(.plain)
            .accessibilityLabel(Text(verbatim: imageViewerPhotos[page].label))
          }
        }
      }
      .aspectRatio(3 / 2, contentMode: .fit)
      Text("Tap a photo. Pinch or double-tap to zoom, swipe down to close.")
        .textVariant(.muted)
    }
    .imageViewer(isPresented: $open, images: images, index: $index)
    .task {
      await load()
    }
  }

  @ViewBuilder
  func thumbnail(_ page: Int) -> some View {
    if let image = loaded[page] {
      Image(uiImage: image)
        .resizable()
        .scaledToFill()
    } else {
      Color.surfaceSecondary
    }
  }

  func load() async {
    await withTaskGroup(of: (Int, UIImage?).self) { group in
      for (page, photo) in imageViewerPhotos.enumerated() {
        group.addTask {
          guard let (data, _) = try? await URLSession.shared.data(from: photo.url) else { return (page, nil) }
          return (page, UIImage(data: data))
        }
      }
      for await (page, image) in group {
        if let image { loaded[page] = image }
      }
    }
  }
}

let group = StoryGroup(.interactions, "Image Viewer", stories: [
  Story("Default") {
    ImageViewerGallery()
  },
  Story("OpenByDefault") {
    ImageViewerGallery(open: true, index: 1)
  },
]
```

```kotlin
import androidx.compose.foundation.Image
import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.FlowRow
import androidx.compose.foundation.layout.aspectRatio
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
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.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Brush
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.drawscope.DrawScope
import androidx.compose.ui.graphics.painter.Painter
import androidx.compose.ui.layout.ContentScale
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.unit.dp
import com.esuiss.ui.components.Text
import com.esuiss.ui.components.TextVariant
import com.esuiss.ui.interactions.ImageViewer
import com.esuiss.ui.interactions.ImageViewerImage
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius

@Composable
fun ImageViewerOpenByDefaultExample() {
    ImageViewerGallery(defaultOpen = true, defaultIndex = 1)
}

class ImageViewerGradient(private val from: Color, private val to: Color, private val size: Size) : Painter() {
    override val intrinsicSize: Size
        get() = size

    override fun DrawScope.onDraw() {
        drawRect(Brush.linearGradient(listOf(from, to), start = Offset.Zero, end = Offset(this.size.width, this.size.height)))
    }
}

val imageViewerLabels = listOf(
    "Mountain lake at sunrise",
    "Valley with a river",
    "Lake between mountains",
    "Foggy hills",
    "Forest path",
)

@Composable
fun ImageViewerGallery(defaultOpen: Boolean, defaultIndex: Int) {
    val colors = EsuissTheme.colors
    var open by rememberSaveable { mutableStateOf(defaultOpen) }
    var index by rememberSaveable { mutableIntStateOf(defaultIndex) }
    val tones = listOf(
        colors.orange to colors.pink,
        colors.teal to colors.blue,
        colors.indigo to colors.cyan,
        colors.gray to colors.mint,
        colors.green to colors.brown,
    )
    val images = remember(tones) {
        imageViewerLabels.mapIndexed { position, label ->
            val (from, to) = tones[position]
            ImageViewerImage(ImageViewerGradient(from, to, Size(1200f, 800f)), contentDescription = label)
        }
    }
    val shape = RoundedCornerShape(Radius.xl)
    Column(verticalArrangement = Arrangement.spacedBy(12.dp)) {
        FlowRow(
            modifier = Modifier.fillMaxWidth(),
            horizontalArrangement = Arrangement.spacedBy(8.dp),
            verticalArrangement = Arrangement.spacedBy(8.dp),
        ) {
            images.forEachIndexed { position, image ->
                Image(
                    painter = image.painter,
                    contentDescription = null,
                    contentScale = ContentScale.Crop,
                    modifier = Modifier
                        .fillMaxWidth(0.31f)
                        .aspectRatio(1f)
                        .clip(shape)
                        .background(colors.surfaceSecondary, shape)
                        .semantics { contentDescription = imageViewerLabels[position] }
                        .clickable(role = Role.Button) {
                            index = position
                            open = true
                        },
                )
            }
        }
        Text("Tap a photo. Pinch or double-tap to zoom, swipe down to close.", variant = TextVariant.Muted)
    }
    ImageViewer(
        open = open,
        onOpenChange = { open = it },
        images = images,
        index = index,
        onIndexChange = { index = it },
    )
}
```

`ImageViewer` opens a set of `images` full screen on a dark media background, starting at the pressed thumbnail. A counter such as `2 of 5` and a close button sit at the top, below the safe area.

Swipe sideways to page between images, with resistance at the first and last image. Pinch to zoom between 1x and 4x around the fingers, double-tap to zoom to 2.5x at the tapped point or back to 1x, and drag to pan while zoomed. Swiping up or down far enough closes the viewer, and a single tap toggles the controls.

## Installation

```bash title="Terminal"
npx @esuiss/uim@latest add image-viewer
```

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

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

The CLI also adds what it builds on: [Icon](/docs/components/icon), [Text](/docs/components/text).

### Manual

**Uniwind**

1. Install the dependencies:

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

2. Add the pieces it builds on: [Icon](/docs/components/icon), [Text](/docs/components/text), and the primitives `components/primitives/image-viewer.tsx`, `components/primitives/use-render.tsx`.

3. Copy the source into `components/interactions/image-viewer.tsx`:

```tsx title="uniwind/components/interactions/image-viewer.tsx"
import { cn } from "cn"
import { XIcon } from "phosphor-react-native"
import * as React from "react"
import { Platform, View } from "react-native"
import { FadeIn, FadeOut, ReduceMotion } from "react-native-reanimated"
import { useSafeAreaInsets } from "react-native-safe-area-context"
import { FullWindowOverlay as RNFullWindowOverlay } from "react-native-screens"
import * as ImageViewerPrimitive from "@/components/primitives/image-viewer"
import { resolveClassName } from "@/components/primitives/use-render"
import { AnimatedView } from "@/components/ui/animated-view"
import { Icon } from "@/components/ui/icon"
import { Text } from "@/components/ui/text"

type ImageViewerImage = ImageViewerPrimitive.ImageViewerImage

const FullWindowOverlay =
  Platform.OS === "ios" ? RNFullWindowOverlay : React.Fragment

function defaultIndexLabel(index: number, count: number) {
  return `${index + 1} of ${count}`
}

function useImageViewer() {
  const context = ImageViewerPrimitive.useRootContext("useImageViewer")
  return {
    open: context.open,
    index: context.index,
    count: context.count,
    images: context.images,
  }
}

function ImageViewer({
  onOpenChange,
  onIndexChange,
  ...props
}: Omit<
  React.ComponentProps<typeof ImageViewerPrimitive.Root>,
  "onOpenChange" | "onIndexChange"
> & {
  onOpenChange?: (open: boolean) => void
  onIndexChange?: (index: number) => void
}) {
  return (
    <ImageViewerPrimitive.Root
      onOpenChange={(open) => onOpenChange?.(open)}
      onIndexChange={(index) => onIndexChange?.(index)}
      {...props}
    />
  )
}

function ImageViewerTrigger({
  className,
  ...props
}: React.ComponentProps<typeof ImageViewerPrimitive.Trigger>) {
  return (
    <ImageViewerPrimitive.Trigger
      className={(state) =>
        cn("active:opacity-80", resolveClassName(className, state))
      }
      {...props}
    />
  )
}

function ImageViewerContent({
  portalHost,
  closeLabel = "Close",
  indexLabel = defaultIndexLabel,
  className,
}: {
  portalHost?: string
  closeLabel?: string
  indexLabel?: (index: number, count: number) => string
  className?: string
}) {
  const insets = useSafeAreaInsets()
  const { index, count } = useImageViewer()
  const label = indexLabel(index, count)
  return (
    <ImageViewerPrimitive.Portal hostName={portalHost}>
      <FullWindowOverlay>
        <AnimatedView
          entering={FadeIn.duration(250).reduceMotion(ReduceMotion.System)}
          exiting={FadeOut.duration(200).reduceMotion(ReduceMotion.System)}
          className="absolute top-0 right-0 bottom-0 left-0 z-50"
        >
          <ImageViewerPrimitive.Popup className={className}>
            <ImageViewerPrimitive.Backdrop className="bg-media" />
            <ImageViewerPrimitive.Pages accessibilityValue={{ text: label }} />
            <ImageViewerPrimitive.Controls
              className="absolute top-0 right-0 left-0 flex-row items-center justify-between px-4"
              style={{ paddingTop: insets.top + 8 }}
            >
              <View className="size-8" />
              <View className="rounded-full bg-on-media/15 px-3 py-1">
                <Text className="text-sm font-semibold text-on-media">
                  {label}
                </Text>
              </View>
              <ImageViewerPrimitive.Close
                accessibilityLabel={closeLabel}
                hitSlop={8}
                className="size-8 items-center justify-center rounded-full bg-on-media/15 active:bg-on-media/25"
              >
                <Icon
                  as={XIcon}
                  weight="bold"
                  className="size-4 text-on-media"
                />
              </ImageViewerPrimitive.Close>
            </ImageViewerPrimitive.Controls>
          </ImageViewerPrimitive.Popup>
        </AnimatedView>
      </FullWindowOverlay>
    </ImageViewerPrimitive.Portal>
  )
}

export type { ImageViewerImage }
export { ImageViewer, ImageViewerContent, ImageViewerTrigger, useImageViewer }
```

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-safe-area-context react-native-screens react-native-svg react-native-worklets
```

2. Add the pieces it builds on: [Icon](/docs/components/icon), [Text](/docs/components/text), and the primitives `components/primitives/image-viewer.tsx`, `components/primitives/use-render.tsx`.

3. Copy the source into `components/interactions/image-viewer.tsx`:

```tsx title="nativewind/components/interactions/image-viewer.tsx"
import { cn } from "cn"
import { XIcon } from "phosphor-react-native"
import * as React from "react"
import { Platform, View } from "react-native"
import { FadeIn, FadeOut, ReduceMotion } from "react-native-reanimated"
import { useSafeAreaInsets } from "react-native-safe-area-context"
import { FullWindowOverlay as RNFullWindowOverlay } from "react-native-screens"
import * as ImageViewerPrimitive from "@/components/primitives/image-viewer"
import { resolveClassName } from "@/components/primitives/use-render"
import { AnimatedView } from "@/components/ui/animated-view"
import { Icon } from "@/components/ui/icon"
import { Text } from "@/components/ui/text"

type ImageViewerImage = ImageViewerPrimitive.ImageViewerImage

const FullWindowOverlay =
  Platform.OS === "ios" ? RNFullWindowOverlay : React.Fragment

function defaultIndexLabel(index: number, count: number) {
  return `${index + 1} of ${count}`
}

function useImageViewer() {
  const context = ImageViewerPrimitive.useRootContext("useImageViewer")
  return {
    open: context.open,
    index: context.index,
    count: context.count,
    images: context.images,
  }
}

function ImageViewer({
  onOpenChange,
  onIndexChange,
  ...props
}: Omit<
  React.ComponentProps<typeof ImageViewerPrimitive.Root>,
  "onOpenChange" | "onIndexChange"
> & {
  onOpenChange?: (open: boolean) => void
  onIndexChange?: (index: number) => void
}) {
  return (
    <ImageViewerPrimitive.Root
      onOpenChange={(open) => onOpenChange?.(open)}
      onIndexChange={(index) => onIndexChange?.(index)}
      {...props}
    />
  )
}

function ImageViewerTrigger({
  className,
  ...props
}: React.ComponentProps<typeof ImageViewerPrimitive.Trigger>) {
  return (
    <ImageViewerPrimitive.Trigger
      className={(state) =>
        cn("active:opacity-80", resolveClassName(className, state))
      }
      {...props}
    />
  )
}

function ImageViewerContent({
  portalHost,
  closeLabel = "Close",
  indexLabel = defaultIndexLabel,
  className,
}: {
  portalHost?: string
  closeLabel?: string
  indexLabel?: (index: number, count: number) => string
  className?: string
}) {
  const insets = useSafeAreaInsets()
  const { index, count } = useImageViewer()
  const label = indexLabel(index, count)
  return (
    <ImageViewerPrimitive.Portal hostName={portalHost}>
      <FullWindowOverlay>
        <AnimatedView
          entering={FadeIn.duration(250).reduceMotion(ReduceMotion.System)}
          exiting={FadeOut.duration(200).reduceMotion(ReduceMotion.System)}
          className="absolute top-0 right-0 bottom-0 left-0 z-50"
        >
          <ImageViewerPrimitive.Popup className={className}>
            <ImageViewerPrimitive.Backdrop className="bg-media" />
            <ImageViewerPrimitive.Pages accessibilityValue={{ text: label }} />
            <ImageViewerPrimitive.Controls
              className="absolute top-0 right-0 left-0 flex-row items-center justify-between px-4"
              style={{ paddingTop: insets.top + 8 }}
            >
              <View className="size-8" />
              <View className="rounded-full bg-on-media-15 px-3 py-1">
                <Text className="text-sm font-semibold text-on-media">
                  {label}
                </Text>
              </View>
              <ImageViewerPrimitive.Close
                accessibilityLabel={closeLabel}
                hitSlop={8}
                className="size-8 items-center justify-center rounded-full bg-on-media-15 active:bg-on-media-25"
              >
                <Icon
                  as={XIcon}
                  weight="bold"
                  className="size-4 text-on-media"
                />
              </ImageViewerPrimitive.Close>
            </ImageViewerPrimitive.Controls>
          </ImageViewerPrimitive.Popup>
        </AnimatedView>
      </FullWindowOverlay>
    </ImageViewerPrimitive.Portal>
  )
}

export type { ImageViewerImage }
export { ImageViewer, ImageViewerContent, ImageViewerTrigger, useImageViewer }
```

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-safe-area-context react-native-screens react-native-svg react-native-worklets
```

2. Add the pieces it builds on: [Icon](/docs/components/icon), [Text](/docs/components/text), and the primitives `components/primitives/image-viewer.tsx`, `components/primitives/use-render.tsx`.

3. Copy the source into `components/interactions/image-viewer.tsx`:

```tsx title="stylesheet/components/interactions/image-viewer.tsx"
import { XIcon } from "phosphor-react-native"
import * as React from "react"
import {
  Platform,
  Pressable,
  StyleSheet,
  View,
  type ViewStyle,
} from "react-native"
import { FadeIn, FadeOut, ReduceMotion } from "react-native-reanimated"
import { useSafeAreaInsets } from "react-native-safe-area-context"
import { FullWindowOverlay as RNFullWindowOverlay } from "react-native-screens"
import * as ImageViewerPrimitive from "@/components/primitives/image-viewer"
import { resolveStyle } from "@/components/primitives/use-render"
import { AnimatedView } from "@/components/ui/animated-view"
import { Icon } from "@/components/ui/icon"
import { Text } from "@/components/ui/text"
import { fontSize, radius, useTheme } from "@/components/ui/theme"

type ImageViewerImage = ImageViewerPrimitive.ImageViewerImage

const FullWindowOverlay =
  Platform.OS === "ios" ? RNFullWindowOverlay : React.Fragment

const styles = StyleSheet.create({
  frame: {
    position: "absolute",
    top: 0,
    right: 0,
    bottom: 0,
    left: 0,
    zIndex: 50,
  },
  pressed: { opacity: 0.8 },
  controls: {
    position: "absolute",
    top: 0,
    right: 0,
    left: 0,
    flexDirection: "row",
    alignItems: "center",
    justifyContent: "space-between",
    paddingHorizontal: 16,
  },
  spacer: { width: 32, height: 32 },
  label: {
    borderRadius: radius.full,
    paddingHorizontal: 12,
    paddingVertical: 4,
  },
  labelText: { ...fontSize.sm, fontWeight: "600" },
  close: {
    width: 32,
    height: 32,
    alignItems: "center",
    justifyContent: "center",
    borderRadius: radius.full,
  },
})

function withAlpha(color: string, alpha: number) {
  if (!color.startsWith("#") || color.length !== 7) return color
  const r = Number.parseInt(color.slice(1, 3), 16)
  const g = Number.parseInt(color.slice(3, 5), 16)
  const b = Number.parseInt(color.slice(5, 7), 16)
  return `rgba(${r}, ${g}, ${b}, ${alpha})`
}

function defaultIndexLabel(index: number, count: number) {
  return `${index + 1} of ${count}`
}

function useImageViewer() {
  const context = ImageViewerPrimitive.useRootContext("useImageViewer")
  return {
    open: context.open,
    index: context.index,
    count: context.count,
    images: context.images,
  }
}

function ImageViewer({
  onOpenChange,
  onIndexChange,
  ...props
}: Omit<
  React.ComponentProps<typeof ImageViewerPrimitive.Root>,
  "onOpenChange" | "onIndexChange"
> & {
  onOpenChange?: (open: boolean) => void
  onIndexChange?: (index: number) => void
}) {
  return (
    <ImageViewerPrimitive.Root
      onOpenChange={(open) => onOpenChange?.(open)}
      onIndexChange={(index) => onIndexChange?.(index)}
      {...props}
    />
  )
}

function ImageViewerTrigger({
  style,
  ...props
}: React.ComponentProps<typeof ImageViewerPrimitive.Trigger>) {
  return (
    <ImageViewerPrimitive.Trigger
      style={(state) => resolveStyle(style, state) as ViewStyle}
      render={(renderProps) => {
        const { style: baseStyle, ...rest } = renderProps
        return (
          <Pressable
            {...rest}
            style={({ pressed }) => [
              baseStyle as ViewStyle,
              pressed && styles.pressed,
            ]}
          />
        )
      }}
      {...props}
    />
  )
}

function ImageViewerContent({
  portalHost,
  closeLabel = "Close",
  indexLabel = defaultIndexLabel,
  style,
}: {
  portalHost?: string
  closeLabel?: string
  indexLabel?: (index: number, count: number) => string
  style?: ViewStyle
}) {
  const { colors } = useTheme()
  const insets = useSafeAreaInsets()
  const { index, count } = useImageViewer()
  const label = indexLabel(index, count)
  return (
    <ImageViewerPrimitive.Portal hostName={portalHost}>
      <FullWindowOverlay>
        <AnimatedView
          entering={FadeIn.duration(250).reduceMotion(ReduceMotion.System)}
          exiting={FadeOut.duration(200).reduceMotion(ReduceMotion.System)}
          style={styles.frame}
        >
          <ImageViewerPrimitive.Popup style={style}>
            <ImageViewerPrimitive.Backdrop
              style={{ backgroundColor: colors.media }}
            />
            <ImageViewerPrimitive.Pages accessibilityValue={{ text: label }} />
            <ImageViewerPrimitive.Controls
              style={[styles.controls, { paddingTop: insets.top + 8 }]}
            >
              <View style={styles.spacer} />
              <View
                style={[
                  styles.label,
                  { backgroundColor: withAlpha(colors.onMedia, 0.15) },
                ]}
              >
                <Text style={[styles.labelText, { color: colors.onMedia }]}>
                  {label}
                </Text>
              </View>
              <ImageViewerPrimitive.Close
                accessibilityLabel={closeLabel}
                hitSlop={8}
                render={(renderProps) => {
                  const { style: baseStyle, ...rest } = renderProps
                  return (
                    <Pressable
                      {...rest}
                      style={({ pressed }) => [
                        baseStyle as ViewStyle,
                        styles.close,
                        {
                          backgroundColor: withAlpha(
                            colors.onMedia,
                            pressed ? 0.25 : 0.15
                          ),
                        },
                      ]}
                    />
                  )
                }}
              >
                <Icon
                  as={XIcon}
                  weight="bold"
                  size={16}
                  color={colors.onMedia}
                />
              </ImageViewerPrimitive.Close>
            </ImageViewerPrimitive.Controls>
          </ImageViewerPrimitive.Popup>
        </AnimatedView>
      </FullWindowOverlay>
    </ImageViewerPrimitive.Portal>
  )
}

export type { ImageViewerImage }
export { ImageViewer, ImageViewerContent, ImageViewerTrigger, useImageViewer }
```

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/Interactions/ImageViewer.swift"
import PhosphorSwift
import SwiftUI

enum ImageViewerMath {
  static let minScale: CGFloat = 1
  static let maxScale: CGFloat = 4
  static let doubleTapScale: CGFloat = 2.5
  static let dismissDistance: CGFloat = 120
  static let fadeDistance: CGFloat = 300

  static func clampScale(_ scale: CGFloat) -> CGFloat {
    min(max(scale, minScale), maxScale)
  }

  static func clampOffset(_ offset: CGSize, scale: CGFloat, size: CGSize) -> CGSize {
    let limitX = max(0, (size.width * scale - size.width) / 2)
    let limitY = max(0, (size.height * scale - size.height) / 2)
    return CGSize(
      width: min(max(offset.width, -limitX), limitX),
      height: min(max(offset.height, -limitY), limitY)
    )
  }

  static func doubleTap(scale: CGFloat, location: CGPoint, size: CGSize) -> (scale: CGFloat, offset: CGSize) {
    guard scale <= minScale else { return (minScale, .zero) }
    let target = doubleTapScale
    let offset = CGSize(
      width: (size.width / 2 - location.x) * (target - 1),
      height: (size.height / 2 - location.y) * (target - 1)
    )
    return (target, clampOffset(offset, scale: target, size: size))
  }

  static func page(current: Int, translation: CGFloat, predicted: CGFloat, width: CGFloat, count: Int) -> Int {
    guard count > 0, width > 0 else { return 0 }
    var next = current
    if translation < -width * 0.25 || predicted < -width * 0.5 {
      next = current + 1
    } else if translation > width * 0.25 || predicted > width * 0.5 {
      next = current - 1
    }
    return min(max(next, 0), count - 1)
  }

  static func resisted(_ translation: CGFloat, current: Int, count: Int) -> CGFloat {
    let atStart = current == 0 && translation > 0
    let atEnd = current >= count - 1 && translation < 0
    return atStart || atEnd ? translation / 3 : translation
  }

  static func backdropOpacity(_ translation: CGFloat) -> Double {
    Double(max(0, 1 - abs(translation) / fadeDistance))
  }

  static func shouldDismiss(translation: CGFloat, predicted: CGFloat) -> Bool {
    abs(translation) > dismissDistance || abs(predicted) > dismissDistance * 2.5
  }
}

extension View {
  public func imageViewer(
    isPresented: Binding<Bool>,
    images: [Image],
    index: Binding<Int>
  ) -> some View {
    modifier(
      CoverPresenter(isPresented: isPresented, enter: .easeOut(duration: 0.2), exit: .easeIn(duration: 0.2)) { visible in
        ImageViewer(images: images, index: index)
          .opacity(visible ? 1 : 0)
          .scaleEffect(visible ? 1 : 0.96)
      }
    )
  }
}

public struct ImageViewer: View {
  let images: [Image]
  let index: Binding<Int>

  @State private var scale: CGFloat = 1
  @State private var offset: CGSize = .zero
  @State private var pinchStart: CGFloat?
  @State private var panStart: CGSize?
  @State private var drag: CGSize = .zero
  @State private var axis: Axis?
  @State private var dismissing = false
  @Environment(\.overlayDismiss) private var dismiss
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  public init(images: [Image], index: Binding<Int>) {
    self.images = images
    self.index = index
  }

  public var body: some View {
    GeometryReader { proxy in
      let size = proxy.size
      let count = images.count
      let current = CarouselMath.clamp(index.wrappedValue, count: count)
      let fade = axis == .vertical || dismissing ? ImageViewerMath.backdropOpacity(drag.height) : 1
      ZStack {
        Color.surface
          .opacity(fade)
          .ignoresSafeArea()
        HStack(spacing: 0) {
          ForEach(images.indices, id: \.self) { page in
            images[page]
              .resizable()
              .scaledToFit()
              .frame(width: size.width, height: size.height)
              .scaleEffect(page == current ? scale : 1)
              .offset(page == current ? offset : .zero)
              .accessibilityHidden(page != current)
          }
        }
        .frame(width: size.width, height: size.height, alignment: .leading)
        .offset(
          x: -CGFloat(current) * size.width + (axis == .horizontal ? drag.width : 0),
          y: axis == .vertical || dismissing ? drag.height : 0
        )
        .contentShape(Rectangle())
        .gesture(dragGesture(size: size, current: current, count: count))
        .simultaneousGesture(magnifyGesture(size: size))
        .onTapGesture(count: 2, coordinateSpace: .local) { location in
          let result = ImageViewerMath.doubleTap(scale: scale, location: location, size: size)
          withAnimation(animation) {
            scale = result.scale
            offset = result.offset
          }
        }
        .accessibilityElement(children: .ignore)
        .accessibilityLabel(Text("Image \(current + 1) of \(count)"))
        .accessibilityAddTraits(.isImage)
        .accessibilityAdjustableAction { direction in
          switch direction {
          case .increment: if current < count - 1 { index.wrappedValue = current + 1 }
          case .decrement: if current > 0 { index.wrappedValue = current - 1 }
          @unknown default: break
          }
        }
        VStack {
          ZStack {
            Text("\(current + 1) of \(count)")
              .scaledFont(.md, weight: .semibold)
              .monospacedDigit()
              .foregroundStyle(Color.label)
            HStack {
              Spacer()
              Button {
                dismiss?()
              } label: {
                Ph.x.bold.frame(width: 16, height: 16)
              }
              .buttonStyle(.variant(.secondary, size: .icon))
              .accessibilityLabel(Text("Close"))
            }
          }
          .padding(.horizontal, 16)
          .frame(height: 44)
          Spacer()
        }
        .opacity(fade)
      }
      .clipped()
    }
    .onChange(of: index.wrappedValue) { _, _ in
      scale = 1
      offset = .zero
    }
    .accessibilityAddTraits(.isModal)
    .accessibilityAction(.escape) { dismiss?() }
    .environment(\.colorScheme, .dark)
  }

  private var animation: Animation? {
    reduceMotion ? nil : .timingCurve(0.32, 0.72, 0, 1, duration: 0.35)
  }

  private func dragGesture(size: CGSize, current: Int, count: Int) -> some Gesture {
    DragGesture(minimumDistance: 10)
      .onChanged { value in
        if scale > 1 {
          let start = panStart ?? offset
          panStart = start
          offset = ImageViewerMath.clampOffset(
            CGSize(width: start.width + value.translation.width, height: start.height + value.translation.height),
            scale: scale,
            size: size
          )
          return
        }
        if axis == nil {
          axis = abs(value.translation.width) > abs(value.translation.height) ? .horizontal : .vertical
        }
        drag = CGSize(
          width: ImageViewerMath.resisted(value.translation.width, current: current, count: count),
          height: value.translation.height
        )
      }
      .onEnded { value in
        panStart = nil
        guard scale <= 1 else { return }
        if axis == .horizontal {
          let target = ImageViewerMath.page(
            current: current,
            translation: value.translation.width,
            predicted: value.predictedEndTranslation.width,
            width: size.width,
            count: count
          )
          withAnimation(animation) {
            index.wrappedValue = target
            drag = .zero
          } completion: {
            axis = nil
          }
        } else if axis == .vertical {
          if ImageViewerMath.shouldDismiss(translation: value.translation.height, predicted: value.predictedEndTranslation.height) {
            dismissing = true
            axis = nil
            dismiss?()
          } else {
            withAnimation(animation) {
              drag = .zero
            } completion: {
              axis = nil
            }
          }
        }
      }
  }

  private func magnifyGesture(size: CGSize) -> some Gesture {
    MagnifyGesture()
      .onChanged { value in
        let start = pinchStart ?? scale
        pinchStart = start
        scale = ImageViewerMath.clampScale(start * value.magnification)
        offset = ImageViewerMath.clampOffset(offset, scale: scale, size: size)
      }
      .onEnded { _ in
        pinchStart = nil
        if scale <= 1.01 {
          withAnimation(animation) {
            scale = 1
            offset = .zero
          }
        }
      }
  }
}
```

```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/Carousel.swift"
import PhosphorSwift
import SwiftUI

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

public enum CarouselDotsVariant: CaseIterable, Sendable {
  case `default`, plain
}

let carouselAnimation = Animation.timingCurve(0.32, 0.72, 0, 1, duration: 0.5)

enum CarouselMath {
  static func clamp(_ index: Int, count: Int) -> Int {
    count == 0 ? 0 : min(max(index, 0), count - 1)
  }

  static func step(from index: Int, by delta: Int, count: Int, loop: Bool) -> Int? {
    guard count > 0 else { return nil }
    let next = index + delta
    if next >= 0 && next < count { return next }
    guard loop, count > 1 else { return nil }
    return ((next % count) + count) % count
  }

  static func autoplayTarget(from index: Int, count: Int, loop: Bool) -> Int? {
    guard count > 1 else { return nil }
    return step(from: index, by: 1, count: count, loop: loop) ?? 0
  }
}

@MainActor
@Observable
public final class CarouselController {
  public private(set) var selectedIndex = 0
  public private(set) var count = 0
  public internal(set) var isPlaying = false

  var keys: [UUID] = []
  var loop = false
  var reduceMotion = false
  var autoplayEnabled = false
  var autoplayDelay: Duration = .seconds(5)
  var autoplayStart: Date?

  public init() {}

  public var canScrollPrev: Bool {
    CarouselMath.step(from: selectedIndex, by: -1, count: count, loop: loop) != nil
  }

  public var canScrollNext: Bool {
    CarouselMath.step(from: selectedIndex, by: 1, count: count, loop: loop) != nil
  }

  public func scrollTo(_ index: Int, animated: Bool = true) {
    let target = CarouselMath.clamp(index, count: count)
    guard target != selectedIndex else { return }
    if animated && !reduceMotion {
      withAnimation(carouselAnimation) { selectedIndex = target }
    } else {
      selectedIndex = target
    }
  }

  public func scrollPrev() {
    if let target = CarouselMath.step(from: selectedIndex, by: -1, count: count, loop: loop) {
      scrollTo(target)
    }
  }

  public func scrollNext() {
    if let target = CarouselMath.step(from: selectedIndex, by: 1, count: count, loop: loop) {
      scrollTo(target)
    }
  }

  public func setPlaying(_ playing: Bool) {
    isPlaying = autoplayEnabled && playing
  }

  func register(_ keys: [UUID]) {
    self.keys = keys
    count = keys.count
    selectedIndex = CarouselMath.clamp(selectedIndex, count: count)
  }

  var position: UUID? {
    get { keys.indices.contains(selectedIndex) ? keys[selectedIndex] : nil }
    set {
      if let newValue, let index = keys.firstIndex(of: newValue) {
        selectedIndex = index
      }
    }
  }
}

extension EnvironmentValues {
  @Entry var carousel: CarouselController? = nil
  @Entry var carouselOrientation: CarouselOrientation = .horizontal
  @Entry var carouselSpacing: CGFloat = 16
}

struct CarouselKeysKey: PreferenceKey {
  static var defaultValue: [UUID] { [] }

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

private struct CarouselAutoplayKey: Hashable {
  let index: Int
  let count: Int
  let running: Bool
}

public struct Carousel<Content: View>: View {
  let orientation: CarouselOrientation
  let loop: Bool
  let autoplay: Duration?
  let external: CarouselController?
  let onSelect: ((Int) -> Void)?
  let content: Content

  @State private var local = CarouselController()
  @Environment(\.accessibilityReduceMotion) private var reduceMotion
  @Environment(\.scenePhase) private var scenePhase

  public init(
    orientation: CarouselOrientation = .horizontal,
    loop: Bool = false,
    autoplay: Duration? = nil,
    controller: CarouselController? = nil,
    onSelect: ((Int) -> Void)? = nil,
    @ViewBuilder content: () -> Content
  ) {
    self.orientation = orientation
    self.loop = loop
    self.autoplay = autoplay
    self.external = controller
    self.onSelect = onSelect
    self.content = content()
  }

  public var body: some View {
    let controller = external ?? local
    let running = controller.isPlaying && scenePhase != .background
    VStack(spacing: 0) {
      content
    }
    .environment(\.carousel, controller)
    .environment(\.carouselOrientation, orientation)
    .onAppear {
      controller.loop = loop
      controller.reduceMotion = reduceMotion
      controller.autoplayEnabled = autoplay != nil
      controller.autoplayDelay = autoplay ?? .seconds(5)
      controller.isPlaying = autoplay != nil && !reduceMotion
    }
    .onChange(of: loop) { _, value in controller.loop = value }
    .onChange(of: reduceMotion) { _, value in controller.reduceMotion = value }
    .onChange(of: controller.selectedIndex) { _, value in onSelect?(value) }
    .task(id: CarouselAutoplayKey(index: controller.selectedIndex, count: controller.count, running: running)) {
      guard running, let delay = autoplay else {
        controller.autoplayStart = nil
        return
      }
      controller.autoplayStart = .now
      do {
        try await Task.sleep(for: delay)
      } catch {
        return
      }
      if let target = CarouselMath.autoplayTarget(from: controller.selectedIndex, count: controller.count, loop: controller.loop) {
        controller.scrollTo(target)
      }
    }
    .accessibilityElement(children: .contain)
  }
}

public struct CarouselContent<Content: View>: View {
  let spacing: CGFloat
  let content: Content

  @State private var keys: [UUID] = []
  @Environment(\.carousel) private var carousel
  @Environment(\.carouselOrientation) private var orientation

  public init(spacing: CGFloat = 16, @ViewBuilder content: () -> Content) {
    self.spacing = spacing
    self.content = content()
  }

  public var body: some View {
    let horizontal = orientation == .horizontal
    ScrollView(horizontal ? .horizontal : .vertical) {
      Group {
        if horizontal {
          HStack(spacing: spacing) { content }
        } else {
          VStack(spacing: spacing) { content }
        }
      }
      .scrollTargetLayout()
    }
    .scrollIndicators(.hidden)
    .scrollTargetBehavior(.viewAligned(limitBehavior: .always))
    .scrollPosition(id: position)
    .environment(\.carouselSpacing, spacing)
    .onPreferenceChange(CarouselKeysKey.self) { value in keys = value }
    .onChange(of: keys, initial: true) { _, value in carousel?.register(value) }
  }

  private var position: Binding<UUID?> {
    let carousel = carousel
    return Binding(
      get: { carousel?.position },
      set: { carousel?.position = $0 }
    )
  }
}

public struct CarouselItem<Content: View>: View {
  let basis: CGFloat
  let content: Content

  @State private var key = UUID()
  @Environment(\.carousel) private var carousel
  @Environment(\.carouselOrientation) private var orientation
  @Environment(\.carouselSpacing) private var spacing

  public init(basis: CGFloat = 1, @ViewBuilder content: () -> Content) {
    self.basis = basis
    self.content = content()
  }

  public var body: some View {
    let index = carousel?.keys.firstIndex(of: key)
    content
      .containerRelativeFrame(orientation == .horizontal ? .horizontal : .vertical) { length, _ in
        max(0, (length + spacing) * min(max(basis, 0), 1) - spacing)
      }
      .id(key)
      .preference(key: CarouselKeysKey.self, value: [key])
      .accessibilityElement(children: .contain)
      .accessibilityLabel(index.map { Text("Slide \($0 + 1) of \(carousel?.count ?? 0)") } ?? Text(verbatim: ""))
  }
}

public struct CarouselPrevious: View {
  let variant: VariantButtonStyle.Variant
  let size: VariantButtonStyle.Size

  @Environment(\.carousel) private var carousel
  @Environment(\.carouselOrientation) private var orientation

  public init(variant: VariantButtonStyle.Variant = .secondary, size: VariantButtonStyle.Size = .icon) {
    self.variant = variant
    self.size = size
  }

  public var body: some View {
    Button {
      carousel?.scrollPrev()
    } label: {
      (orientation == .horizontal ? Ph.caretLeft.bold : Ph.caretUp.bold)
        .frame(width: 16, height: 16)
        .flipsForRightToLeftLayoutDirection(orientation == .horizontal)
    }
    .buttonStyle(.variant(variant, size: size))
    .disabled(!(carousel?.canScrollPrev ?? false))
    .accessibilityLabel(Text("Previous slide"))
  }
}

public struct CarouselNext: View {
  let variant: VariantButtonStyle.Variant
  let size: VariantButtonStyle.Size

  @Environment(\.carousel) private var carousel
  @Environment(\.carouselOrientation) private var orientation

  public init(variant: VariantButtonStyle.Variant = .secondary, size: VariantButtonStyle.Size = .icon) {
    self.variant = variant
    self.size = size
  }

  public var body: some View {
    Button {
      carousel?.scrollNext()
    } label: {
      (orientation == .horizontal ? Ph.caretRight.bold : Ph.caretDown.bold)
        .frame(width: 16, height: 16)
        .flipsForRightToLeftLayoutDirection(orientation == .horizontal)
    }
    .buttonStyle(.variant(variant, size: size))
    .disabled(!(carousel?.canScrollNext ?? false))
    .accessibilityLabel(Text("Next slide"))
  }
}

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

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

  public var body: some View {
    HStack(spacing: 12) {
      content
    }
    .padding(.top, 24)
  }
}

public struct CarouselDots: View {
  let variant: CarouselDotsVariant

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

  public init(variant: CarouselDotsVariant = .default) {
    self.variant = variant
  }

  public var body: some View {
    let count = carousel?.count ?? 0
    let selected = carousel?.selectedIndex ?? 0
    let autoplay = carousel?.autoplayEnabled ?? false
    HStack(spacing: 16) {
      ForEach(0..<count, id: \.self) { index in
        let active = index == selected
        Button {
          carousel?.scrollTo(index)
        } label: {
          Capsule()
            .fill(active ? (autoplay ? Color.labelTertiary : .label) : .labelTertiary)
            .frame(width: active ? 24 : 8, height: 8)
            .overlay(alignment: .leading) {
              if active && autoplay, let carousel {
                CarouselDotsFill(carousel: carousel)
              }
            }
            .clipShape(Capsule())
            .padding(8)
            .contentShape(Rectangle())
        }
        .buttonStyle(.plain)
        .padding(-8)
        .accessibilityLabel(Text("Go to slide \(index + 1)"))
        .accessibilityAddTraits(active ? .isSelected : [])
      }
    }
    .animation(reduceMotion ? nil : carouselAnimation, value: selected)
    .frame(height: 36)
    .padding(.horizontal, variant == .default ? 16 : 0)
    .background {
      if variant == .default {
        Capsule().fill(Color.control)
      }
    }
  }
}

private struct CarouselDotsFill: View {
  let carousel: CarouselController

  var body: some View {
    TimelineView(.animation(paused: carousel.autoplayStart == nil)) { timeline in
      GeometryReader { proxy in
        Capsule()
          .fill(Color.label)
          .frame(width: proxy.size.width * fraction(at: timeline.date))
      }
    }
  }

  private func fraction(at date: Date) -> CGFloat {
    guard carousel.isPlaying else { return 1 }
    guard let start = carousel.autoplayStart else { return 0 }
    let delay = carousel.autoplayDelay / .seconds(1)
    guard delay > 0 else { return 1 }
    return min(max(date.timeIntervalSince(start) / delay, 0), 1)
  }
}

public struct CarouselPlayButton: View {
  let variant: VariantButtonStyle.Variant
  let size: VariantButtonStyle.Size

  @Environment(\.carousel) private var carousel

  public init(variant: VariantButtonStyle.Variant = .secondary, size: VariantButtonStyle.Size = .iconSm) {
    self.variant = variant
    self.size = size
  }

  public var body: some View {
    if let carousel, carousel.autoplayEnabled {
      let playing = carousel.isPlaying
      Button {
        carousel.setPlaying(!playing)
      } label: {
        (playing ? Ph.pause.fill : Ph.play.fill)
          .frame(width: 14, height: 14)
      }
      .buttonStyle(.variant(variant, size: size))
      .accessibilityLabel(playing ? Text("Pause slideshow") : Text("Play slideshow"))
    }
  }
}
```

```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/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/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/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)
  }
}
```

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/interactions/ImageViewer.kt"
package com.esuiss.ui.interactions

import androidx.compose.animation.core.Animatable
import androidx.compose.animation.core.CubicBezierEasing
import androidx.compose.animation.core.VectorConverter
import androidx.compose.animation.core.spring
import androidx.compose.animation.core.tween
import androidx.compose.foundation.Image
import androidx.compose.foundation.background
import androidx.compose.foundation.gestures.awaitEachGesture
import androidx.compose.foundation.gestures.awaitFirstDown
import androidx.compose.foundation.gestures.calculateCentroid
import androidx.compose.foundation.gestures.calculatePan
import androidx.compose.foundation.gestures.calculateZoom
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.WindowInsets
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.safeDrawing
import androidx.compose.foundation.layout.windowInsetsPadding
import androidx.compose.foundation.pager.HorizontalPager
import androidx.compose.foundation.pager.rememberPagerState
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.LaunchedEffect
import androidx.compose.runtime.Stable
import androidx.compose.runtime.getValue
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.geometry.Offset
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.graphics.painter.Painter
import androidx.compose.ui.input.pointer.pointerInput
import androidx.compose.ui.input.pointer.positionChanged
import androidx.compose.ui.layout.ContentScale
import androidx.compose.ui.layout.onSizeChanged
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.semantics.stateDescription
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.IntSize
import androidx.compose.ui.unit.dp
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.X
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.ModalWindow
import com.esuiss.ui.theme.DarkColors
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.LocalColors
import com.esuiss.ui.theme.Typography
import kotlin.math.abs
import kotlin.math.roundToInt
import kotlinx.coroutines.coroutineScope
import kotlinx.coroutines.flow.distinctUntilChanged
import kotlinx.coroutines.launch

@Immutable
class ImageViewerImage(val painter: Painter, val contentDescription: String? = null)

private const val MinScale = 1f
private const val MaxScale = 4f
private const val DoubleTapScale = 2.5f
private val Easing = CubicBezierEasing(0.32f, 0.72f, 0f, 1f)

@Stable
private class ZoomState {
    val scale = Animatable(1f)
    val offset = Animatable(Offset.Zero, Offset.VectorConverter)
    var size by mutableStateOf(IntSize.Zero)

    fun bounds(scale: Float): Offset = Offset(size.width * (scale - 1f) / 2f, size.height * (scale - 1f) / 2f)

    fun clamp(value: Offset, scale: Float): Offset {
        val limit = bounds(scale)
        return Offset(value.x.coerceIn(-limit.x, limit.x), value.y.coerceIn(-limit.y, limit.y))
    }

    suspend fun reset() = coroutineScope {
        launch { scale.animateTo(1f, tween(300, easing = Easing)) }
        launch { offset.animateTo(Offset.Zero, tween(300, easing = Easing)) }
    }

    suspend fun zoomTo(target: Float, focus: Offset) = coroutineScope {
        val center = Offset(size.width / 2f, size.height / 2f)
        val next = clamp((center - focus) * (target - 1f), target)
        launch { scale.animateTo(target, tween(300, easing = Easing)) }
        launch { offset.animateTo(next, tween(300, easing = Easing)) }
    }
}

@Composable
fun ImageViewer(
    open: Boolean,
    onOpenChange: (Boolean) -> Unit,
    images: List<ImageViewerImage>,
    index: Int,
    onIndexChange: (Int) -> Unit,
    modifier: Modifier = Modifier,
    closeLabel: String = "Close",
    indexLabel: (index: Int, count: Int) -> String = { current, count -> "${current + 1} of $count" },
) {
    var shown by remember { mutableStateOf(open) }
    val appear = remember { Animatable(if (open) 1f else 0f) }
    val dismiss = remember { Animatable(0f) }
    LaunchedEffect(open) {
        if (open) {
            shown = true
            dismiss.snapTo(0f)
            appear.animateTo(1f, tween(250, easing = Easing))
        } else if (shown) {
            appear.animateTo(0f, tween(200, easing = Easing))
            shown = false
        }
    }
    if (images.isEmpty()) return
    val change by rememberUpdatedState(onOpenChange)
    val indexChange by rememberUpdatedState(onIndexChange)
    ModalWindow(
        visible = shown,
        onDismissRequest = { change(false) },
        dismissOnBackPress = true,
        paneTitle = images.getOrNull(index)?.contentDescription,
    ) {
        CompositionLocalProvider(LocalColors provides DarkColors) {
            val colors = EsuissTheme.colors
            val pager = rememberPagerState(index.coerceIn(0, images.lastIndex)) { images.size }
            val zooms = remember(images.size) { List(images.size) { ZoomState() } }
            val scope = rememberCoroutineScope()
            LaunchedEffect(pager) {
                snapshotFlow { pager.settledPage }.distinctUntilChanged().collect { page ->
                    zooms.forEachIndexed { position, zoom ->
                        if (position != page && zoom.scale.value != 1f) {
                            zoom.scale.snapTo(1f)
                            zoom.offset.snapTo(Offset.Zero)
                        }
                    }
                    if (page != index) indexChange(page)
                }
            }
            LaunchedEffect(index) {
                val target = index.coerceIn(0, images.lastIndex)
                if (target != pager.settledPage) pager.scrollToPage(target)
            }
            val zoomed = zooms.getOrNull(pager.currentPage)?.let { it.scale.value > 1.01f } ?: false
            Box(
                modifier = modifier
                    .fillMaxSize()
                    .graphicsLayer { alpha = appear.value }
                    .background(colors.surface.copy(alpha = 1f - (abs(dismiss.value) / 600f).coerceIn(0f, 0.8f))),
            ) {
                HorizontalPager(
                    state = pager,
                    modifier = Modifier.fillMaxSize(),
                    userScrollEnabled = !zoomed,
                    pageSpacing = 16.dp,
                ) { page ->
                    val zoom = zooms[page]
                    val image = images[page]
                    Box(
                        modifier = Modifier
                            .fillMaxSize()
                            .onSizeChanged { zoom.size = it }
                            .pointerInput(zoom) {
                                val slop = viewConfiguration.touchSlop
                                var lastTap = 0L
                                var lastTapPosition = Offset.Zero
                                awaitEachGesture {
                                    val down = awaitFirstDown(requireUnconsumed = false)
                                    var mode = 0
                                    var travel = Offset.Zero
                                    var moved = false
                                    var multi = false
                                    do {
                                        val event = awaitPointerEvent()
                                        val pressed = event.changes.count { it.pressed }
                                        if (pressed >= 2) {
                                            multi = true
                                            mode = 3
                                            val factor = event.calculateZoom()
                                            val pan = event.calculatePan()
                                            val centroid = event.calculateCentroid()
                                            val center = Offset(size.width / 2f, size.height / 2f)
                                            val current = zoom.scale.value
                                            val next = (current * factor).coerceIn(MinScale * 0.8f, MaxScale)
                                            val applied = next / current
                                            val offset = (zoom.offset.value + pan) * applied + (centroid - center) * (1f - applied)
                                            scope.launch {
                                                zoom.scale.snapTo(next)
                                                zoom.offset.snapTo(zoom.clamp(offset, maxOf(next, 1f)))
                                            }
                                            event.changes.forEach { if (it.positionChanged()) it.consume() }
                                        } else if (pressed == 1) {
                                            val pan = event.calculatePan()
                                            travel += pan
                                            if (travel.getDistance() > slop) moved = true
                                            if (zoom.scale.value > 1.01f && mode != 3) {
                                                mode = 2
                                                val next = zoom.clamp(zoom.offset.value + pan, zoom.scale.value)
                                                scope.launch { zoom.offset.snapTo(next) }
                                                event.changes.forEach { it.consume() }
                                            } else if (mode == 0 && moved) {
                                                mode = if (abs(travel.y) > abs(travel.x)) 1 else 4
                                            }
                                            if (mode == 1) {
                                                scope.launch { dismiss.snapTo(dismiss.value + pan.y) }
                                                event.changes.forEach { it.consume() }
                                            }
                                        }
                                    } while (event.changes.any { it.pressed })
                                    when {
                                        mode == 1 -> {
                                            if (abs(dismiss.value) > 120.dp.toPx()) {
                                                change(false)
                                            } else {
                                                scope.launch { dismiss.animateTo(0f, spring()) }
                                            }
                                        }
                                        mode == 3 && zoom.scale.value < 1f -> scope.launch { zoom.reset() }
                                        !moved && !multi -> {
                                            val now = down.uptimeMillis
                                            if (now - lastTap < viewConfiguration.doubleTapTimeoutMillis &&
                                                (down.position - lastTapPosition).getDistance() < slop * 4
                                            ) {
                                                lastTap = 0L
                                                scope.launch {
                                                    if (zoom.scale.value > 1.01f) zoom.reset() else zoom.zoomTo(DoubleTapScale, down.position)
                                                }
                                            } else {
                                                lastTap = now
                                                lastTapPosition = down.position
                                            }
                                        }
                                    }
                                }
                            }
                            .semantics {
                                image.contentDescription?.let { contentDescription = it }
                                stateDescription = "${(zoom.scale.value * 100).roundToInt()}%"
                            },
                        contentAlignment = Alignment.Center,
                    ) {
                        Image(
                            painter = image.painter,
                            contentDescription = null,
                            contentScale = ContentScale.Fit,
                            modifier = Modifier
                                .fillMaxSize()
                                .graphicsLayer {
                                    scaleX = zoom.scale.value
                                    scaleY = zoom.scale.value
                                    translationX = zoom.offset.value.x
                                    translationY = zoom.offset.value.y + if (page == pager.currentPage) dismiss.value else 0f
                                    val shrink = 1f - (abs(dismiss.value) / 3000f).coerceIn(0f, 0.2f)
                                    if (page == pager.currentPage) {
                                        scaleX *= shrink
                                        scaleY *= shrink
                                    }
                                },
                        )
                    }
                }
                Row(
                    modifier = Modifier
                        .fillMaxWidth()
                        .windowInsetsPadding(WindowInsets.safeDrawing)
                        .padding(horizontal = 12.dp)
                        .height(52.dp)
                        .graphicsLayer { alpha = 1f - (abs(dismiss.value) / 200f).coerceIn(0f, 1f) },
                    verticalAlignment = Alignment.CenterVertically,
                ) {
                    Box(modifier = Modifier.weight(1f))
                    BasicText(
                        indexLabel(pager.currentPage, images.size),
                        style = Typography.base.copy(color = colors.label, fontWeight = FontWeight.SemiBold),
                    )
                    Box(modifier = Modifier.weight(1f), contentAlignment = Alignment.CenterEnd) {
                        Button(onClick = { change(false) }, variant = ButtonVariant.Secondary, size = ButtonSize.Icon) {
                            Icon(PhosphorIcons.Regular.X, contentDescription = closeLabel)
                        }
                    }
                }
            }
        }
    }
}
```

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

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

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

enum class PopupAlign { Start, Center, End }

internal val PopupInset = 16.dp

internal val PopupMargin = 8.dp

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

## Usage

```tsx
import { ImageViewer, ImageViewerTrigger, ImageViewerContent } from "@/components/interactions/image-viewer"
```

```tsx
<Gallery defaultOpen defaultIndex={1} />
```

Pass `images` to `ImageViewer`, wrap each thumbnail in an `ImageViewerTrigger` with its `index`, and render one `ImageViewerContent`. Give each image an `accessibilityLabel`. The `ImageViewerImage` type is exported.

Open state and the current image can be uncontrolled with `defaultOpen` and `defaultIndex`, or controlled with `open`, `onOpenChange`, `index` and `onIndexChange`. `useImageViewer` returns `open`, `index`, `count` and `images`.

## Examples

### Default

![Preview](https://uim.suiss.app/previews/interactions-image-viewer--default.light.webp)

```tsx
import { Image, View } from "react-native"
import { ImageViewer, ImageViewerContent, type ImageViewerImage, ImageViewerTrigger } from "@/components/interactions/image-viewer"
import { Text } from "@/components/ui/text"

const images: ImageViewerImage[] = [
  {
    source: {
      uri: "https://images.unsplash.com/photo-1588345921523-c2dcdb7f1dcd?w=1200&q=80",
    },
    accessibilityLabel: "Mountain lake at sunrise",
  },
  {
    source: {
      uri: "https://images.unsplash.com/photo-1506744038136-46273834b3fb?w=1200&q=80",
    },
    accessibilityLabel: "Valley with a river",
  },
  {
    source: {
      uri: "https://images.unsplash.com/photo-1501785888041-af3ef285b470?w=1200&q=80",
    },
    accessibilityLabel: "Lake between mountains",
  },
  {
    source: {
      uri: "https://images.unsplash.com/photo-1470071459604-3b5ec3a7fe05?w=1200&q=80",
    },
    accessibilityLabel: "Foggy hills",
  },
  {
    source: {
      uri: "https://images.unsplash.com/photo-1441974231531-c6227db76b6e?w=1200&q=80",
    },
    accessibilityLabel: "Forest path",
  },
]

function Gallery({
  defaultOpen,
  defaultIndex,
}: {
  defaultOpen?: boolean
  defaultIndex?: number
}) {
  return (
    <ImageViewer
      images={images}
      defaultOpen={defaultOpen}
      defaultIndex={defaultIndex}
    >
      <View className="gap-3">
        <View className="flex-row flex-wrap gap-2">
          {images.map((image, index) => (
            <ImageViewerTrigger
              key={image.accessibilityLabel}
              index={index}
              accessibilityLabel={image.accessibilityLabel}
              className="aspect-square w-[31%] overflow-hidden rounded-xl bg-surface-secondary"
            >
              <Image source={image.source} className="h-full w-full" />
            </ImageViewerTrigger>
          ))}
        </View>
        <Text variant="muted">
          Tap a photo. Pinch or double-tap to zoom, swipe down to close.
        </Text>
      </View>
      <ImageViewerContent />
    </ImageViewer>
  )
}

export function ImageViewerExample() {
  return (
    <Gallery />
  )
}
```

```swift
import EsuissUI
import SwiftUI
import UIKit

struct ImageViewerPhoto {
  let url: URL
  let label: String
}

let imageViewerPhotos = [
  ImageViewerPhoto(url: URL(string: "https://images.unsplash.com/photo-1588345921523-c2dcdb7f1dcd?w=1200&q=80")!, label: "Mountain lake at sunrise"),
  ImageViewerPhoto(url: URL(string: "https://images.unsplash.com/photo-1506744038136-46273834b3fb?w=1200&q=80")!, label: "Valley with a river"),
  ImageViewerPhoto(url: URL(string: "https://images.unsplash.com/photo-1501785888041-af3ef285b470?w=1200&q=80")!, label: "Lake between mountains"),
  ImageViewerPhoto(url: URL(string: "https://images.unsplash.com/photo-1470071459604-3b5ec3a7fe05?w=1200&q=80")!, label: "Foggy hills"),
  ImageViewerPhoto(url: URL(string: "https://images.unsplash.com/photo-1441974231531-c6227db76b6e?w=1200&q=80")!, label: "Forest path"),
]

struct ImageViewerGallery: View {
  @State private var open: Bool
  @State private var index: Int
  @State private var loaded: [Int: UIImage] = [:]

  init(open: Bool = false, index: Int = 0) {
    _open = State(initialValue: open)
    _index = State(initialValue: index)
  }

  var images: [Image] {
    imageViewerPhotos.indices.map { page in
      let photo = imageViewerPhotos[page]
      if let cgImage = loaded[page]?.cgImage {
        return Image(cgImage, scale: 1, orientation: .up, label: Text(verbatim: photo.label))
      }
      return Image(uiImage: UIImage())
    }
  }

  var body: some View {
    VStack(alignment: .leading, spacing: 12) {
      GeometryReader { proxy in
        let side = ((proxy.size.width - 16) / 3).rounded(.down)
        FlowRow(spacing: 8) {
          ForEach(imageViewerPhotos.indices, id: \.self) { page in
            Button {
              index = page
              open = true
            } label: {
              thumbnail(page)
                .frame(width: side, height: side)
                .background(Color.surfaceSecondary)
                .clipShape(RoundedRectangle(cornerRadius: Radius.xl, style: .continuous))
            }
            .buttonStyle(.plain)
            .accessibilityLabel(Text(verbatim: imageViewerPhotos[page].label))
          }
        }
      }
      .aspectRatio(3 / 2, contentMode: .fit)
      Text("Tap a photo. Pinch or double-tap to zoom, swipe down to close.")
        .textVariant(.muted)
    }
    .imageViewer(isPresented: $open, images: images, index: $index)
    .task {
      await load()
    }
  }

  @ViewBuilder
  func thumbnail(_ page: Int) -> some View {
    if let image = loaded[page] {
      Image(uiImage: image)
        .resizable()
        .scaledToFill()
    } else {
      Color.surfaceSecondary
    }
  }

  func load() async {
    await withTaskGroup(of: (Int, UIImage?).self) { group in
      for (page, photo) in imageViewerPhotos.enumerated() {
        group.addTask {
          guard let (data, _) = try? await URLSession.shared.data(from: photo.url) else { return (page, nil) }
          return (page, UIImage(data: data))
        }
      }
      for await (page, image) in group {
        if let image { loaded[page] = image }
      }
    }
  }
}

let group = StoryGroup(.interactions, "Image Viewer", stories: [
  Story("Default") {
    ImageViewerGallery()
  },
  Story("OpenByDefault") {
    ImageViewerGallery(open: true, index: 1)
  },
]
```

```kotlin
import androidx.compose.foundation.Image
import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.FlowRow
import androidx.compose.foundation.layout.aspectRatio
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
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.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Brush
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.drawscope.DrawScope
import androidx.compose.ui.graphics.painter.Painter
import androidx.compose.ui.layout.ContentScale
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.unit.dp
import com.esuiss.ui.components.Text
import com.esuiss.ui.components.TextVariant
import com.esuiss.ui.interactions.ImageViewer
import com.esuiss.ui.interactions.ImageViewerImage
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius

@Composable
fun ImageViewerExample() {
    ImageViewerGallery(defaultOpen = false, defaultIndex = 0)
}

class ImageViewerGradient(private val from: Color, private val to: Color, private val size: Size) : Painter() {
    override val intrinsicSize: Size
        get() = size

    override fun DrawScope.onDraw() {
        drawRect(Brush.linearGradient(listOf(from, to), start = Offset.Zero, end = Offset(this.size.width, this.size.height)))
    }
}

val imageViewerLabels = listOf(
    "Mountain lake at sunrise",
    "Valley with a river",
    "Lake between mountains",
    "Foggy hills",
    "Forest path",
)

@Composable
fun ImageViewerGallery(defaultOpen: Boolean, defaultIndex: Int) {
    val colors = EsuissTheme.colors
    var open by rememberSaveable { mutableStateOf(defaultOpen) }
    var index by rememberSaveable { mutableIntStateOf(defaultIndex) }
    val tones = listOf(
        colors.orange to colors.pink,
        colors.teal to colors.blue,
        colors.indigo to colors.cyan,
        colors.gray to colors.mint,
        colors.green to colors.brown,
    )
    val images = remember(tones) {
        imageViewerLabels.mapIndexed { position, label ->
            val (from, to) = tones[position]
            ImageViewerImage(ImageViewerGradient(from, to, Size(1200f, 800f)), contentDescription = label)
        }
    }
    val shape = RoundedCornerShape(Radius.xl)
    Column(verticalArrangement = Arrangement.spacedBy(12.dp)) {
        FlowRow(
            modifier = Modifier.fillMaxWidth(),
            horizontalArrangement = Arrangement.spacedBy(8.dp),
            verticalArrangement = Arrangement.spacedBy(8.dp),
        ) {
            images.forEachIndexed { position, image ->
                Image(
                    painter = image.painter,
                    contentDescription = null,
                    contentScale = ContentScale.Crop,
                    modifier = Modifier
                        .fillMaxWidth(0.31f)
                        .aspectRatio(1f)
                        .clip(shape)
                        .background(colors.surfaceSecondary, shape)
                        .semantics { contentDescription = imageViewerLabels[position] }
                        .clickable(role = Role.Button) {
                            index = position
                            open = true
                        },
                )
            }
        }
        Text("Tap a photo. Pinch or double-tap to zoom, swipe down to close.", variant = TextVariant.Muted)
    }
    ImageViewer(
        open = open,
        onOpenChange = { open = it },
        images = images,
        index = index,
        onIndexChange = { index = it },
    )
}
```

## API Reference

### ImageViewer

The root that holds the images, open state and current index.

### ImageViewerTrigger

A pressable thumbnail that opens the viewer at its `index`.

### ImageViewerContent

The full-screen viewer with the pages, counter and close button.

## Accessibility

- The viewer is modal for screen readers, and the escape gesture closes it.
- The current page is `adjustable`: swiping up or down with a screen reader moves between images. It is labelled by the image's `accessibilityLabel`, or `Image n`, with the counter as its value.
- Triggers have the `button` role and expose their `expanded` state.

## Notes

- The viewer fades in and out, and paging and zoom animations respect the system reduce motion setting.
- Colors use the `bg-media` and `text-on-media` tokens, so the viewer stays dark in light mode.
- On iOS the viewer renders in a full-window overlay so it appears above native screens.