# Qr Scanner

A camera overlay with a rounded cut-out scan frame, rounded corner brackets, an optional scan line and an optional flashlight toggle.

Qr Scanner is an open-source mobile component 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/components/qr-scanner

![Preview](https://uim.suiss.app/previews/components-qr-scanner--default.light.webp)

```tsx
import { IconProps as PhosphorIconProps } from "phosphor-react-native"
import * as React from "react"
import { View } from "react-native"
import { Path } from "react-native-svg"
import Svg from "react-native-svg"
import { Icon } from "@/components/ui/icon"
import { QRScanner, type QRScannerState } from "@/components/ui/qr-scanner"

const MODULES = 21

const MODULE_SIZE = 6

const CODE_SIZE = MODULES * MODULE_SIZE

const FINDERS = [
  [0, 0],
  [0, 14],
  [14, 0],
]

function isDark(row: number, column: number) {
  for (const [top, left] of FINDERS) {
    const i = row - top
    const j = column - left
    if (i >= 0 && i <= 6 && j >= 0 && j <= 6) {
      return (
        i === 0 ||
        i === 6 ||
        j === 0 ||
        j === 6 ||
        (i >= 2 && i <= 4 && j >= 2 && j <= 4)
      )
    }
    const boxTop = top === 0 ? 0 : top - 1
    const boxLeft = left === 0 ? 0 : left - 1
    if (
      row >= boxTop &&
      row <= boxTop + 7 &&
      column >= boxLeft &&
      column <= boxLeft + 7
    ) {
      return false
    }
  }
  return (row * 7 + column * 11 + row * column) % 5 < 2
}

const CODE_PATH = Array.from({ length: MODULES * MODULES }, (_, index) => {
  const row = Math.floor(index / MODULES)
  const column = index % MODULES
  return isDark(row, column)
    ? `M${column * MODULE_SIZE} ${row * MODULE_SIZE}h${MODULE_SIZE}v${MODULE_SIZE}h-${MODULE_SIZE}Z`
    : ""
}).join("")

function QRCode({ color }: PhosphorIconProps) {
  return (
    <Svg width={CODE_SIZE} height={CODE_SIZE}>
      <Path d={CODE_PATH} fill={color} />
    </Svg>
  )
}

function CameraPlaceholder() {
  return (
    <View className="flex-1 items-center justify-center bg-media">
      <View className="mb-12 -rotate-6 rounded-xl bg-on-media p-2.5">
        <Icon as={QRCode} className="text-media" />
      </View>
    </View>
  )
}

function Scanner({
  state,
  description,
  scanLine,
}: {
  state?: QRScannerState
  description?: string
  scanLine?: boolean
}) {
  const [torch, setTorch] = React.useState(false)
  return (
    <QRScanner
      className="flex-1"
      state={state}
      scanLine={scanLine}
      title="Scan QR code"
      description={description}
      torch={torch}
      onTorchToggle={setTorch}
    >
      <CameraPlaceholder />
    </QRScanner>
  )
}

export function QrScannerExample() {
  return (
    <Scanner description="Point your camera at a code to pay or connect." />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct QRScannerExample: View {
  var body: some View {
    QRScannerDemo(hint: "Point your camera at a code to pay or connect.")
  }
}

struct QRScannerDemo: View {
  var state: QRScannerState = .idle
  let hint: LocalizedStringKey
  var scanLine = false

  @State private var torch = false

  var body: some View {
    QRScanner(
      state: state,
      title: "Scan QR code",
      hint: hint,
      scanLine: scanLine,
      isTorchOn: torch,
      onTorchToggle: { torch.toggle() }
    ) {
      QRScannerCameraPlaceholder()
    }
    .ignoresSafeArea()
  }
}

enum QRCodeSample {
  static let count = 21
  static let module: CGFloat = 6
  static let padding: CGFloat = 10
  static let side = CGFloat(count) * module + padding * 2

  static func isDark(_ r: Int, _ c: Int) -> Bool {
    for (fr, fc) in [(0, 0), (0, 14), (14, 0)] {
      let i = r - fr
      let j = c - fc
      if (0...6).contains(i) && (0...6).contains(j) {
        return i == 0 || i == 6 || j == 0 || j == 6 || ((2...4).contains(i) && (2...4).contains(j))
      }
    }
    if r <= 7 && c <= 7 { return false }
    if r <= 7 && c >= 13 { return false }
    if r >= 13 && c <= 7 { return false }
    return (r * 7 + c * 11 + r * c) % 5 < 2
  }

  static let modules: Path = {
    var path = Path()
    for r in 0..<count {
      for c in 0..<count where isDark(r, c) {
        path.addRect(CGRect(x: padding + CGFloat(c) * module, y: padding + CGFloat(r) * module, width: module, height: module))
      }
    }
    return path
  }()
}

struct QRScannerCameraPlaceholder: View {
  var body: some View {
    GeometryReader { proxy in
      Canvas { context, _ in
        let card = CGRect(origin: .zero, size: CGSize(width: QRCodeSample.side, height: QRCodeSample.side))
        context.fill(Path(roundedRect: card, cornerRadius: Radius.xl, style: .continuous), with: .color(.onMedia))
        context.fill(QRCodeSample.modules, with: .color(.media))
      }
      .frame(width: QRCodeSample.side, height: QRCodeSample.side)
      .rotationEffect(.degrees(-6))
      .position(x: proxy.size.width / 2, y: proxy.size.height / 2 - 24)
    }
    .background(Color.media)
    .accessibilityHidden(true)
  }
}

let count = 21

let module: CGFloat = 6

let padding: CGFloat = 10

let side = CGFloat(count) * module + padding * 2

func isDark(_ r: Int, _ c: Int) -> Bool {
  for (fr, fc) in [(0, 0), (0, 14), (14, 0)] {
    let i = r - fr
    let j = c - fc
    if (0...6).contains(i) && (0...6).contains(j) {
      return i == 0 || i == 6 || j == 0 || j == 6 || ((2...4).contains(i) && (2...4).contains(j))
    }
  }
  if r <= 7 && c <= 7 { return false }
  if r <= 7 && c >= 13 { return false }
  if r >= 13 && c <= 7 { return false }
  return (r * 7 + c * 11 + r * c) % 5 < 2
}

let modules: Path = {
  var path = Path()
  for r in 0..<count {
    for c in 0..<count where isDark(r, c) {
      path.addRect(CGRect(x: padding + CGFloat(c) * module, y: padding + CGFloat(r) * module, width: module, height: module))
    }
  }
  return path
}
```

```kotlin
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import com.esuiss.ui.components.QrScanner
import com.esuiss.ui.components.QrScannerState

@Composable
fun QRScannerExample() {
    QrScannerDemo(hint = "Point your camera at a code to pay or connect.")
}

@Composable
fun QrScannerDemo(
    state: QrScannerState = QrScannerState.Idle,
    hint: String? = null,
    scanLine: Boolean = false,
) {
    var torch by rememberSaveable { mutableStateOf(false) }
    QrScanner(
        modifier = Modifier.fillMaxSize(),
        state = state,
        title = "Scan QR code",
        hint = hint,
        scanLine = scanLine,
        torch = torch,
        onTorchToggle = { torch = it },
    ) {
        QrScannerCameraPlaceholder()
    }
}
```

`QRScanner` is a `View` that draws an overlay on top of whatever you pass as `children`, usually a camera preview. It does not open the camera itself. The overlay dims everything outside a square frame with rounded corners (drawn with `react-native-svg`) and marks the frame with four rounded corner brackets. When `scanLine` is set, a line moves up and down inside the frame with Reanimated while the state is `idle`.

The frame size defaults to 66% of the shorter side, capped at 260 points. It is centered horizontally and sits slightly above the vertical center. A `title` sits above the frame and a `description` below it; the flashlight button sits near the bottom edge.

## Installation

```bash title="Terminal"
npx @esuiss/uim@latest add qr-scanner
```

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

```bash title="Terminal"
npx @esuiss/uim@latest add qr-scanner --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-svg react-native-worklets
```

2. Add the pieces it builds on: [Icon](/docs/components/icon), [Text](/docs/components/text), and the primitives `components/primitives/haptics.tsx`, `components/primitives/hooks.tsx`.

3. Copy the source into `components/ui/qr-scanner.tsx`:

```tsx title="uniwind/components/ui/qr-scanner.tsx"
import { cn } from "cn"
import {
  FlashlightIcon,
  type IconProps as PhosphorIconProps,
} from "phosphor-react-native"
import * as React from "react"
import { Pressable, View } from "react-native"
import Animated, {
  cancelAnimation,
  Easing,
  ReduceMotion,
  useAnimatedProps,
  useAnimatedStyle,
  useReducedMotion,
  useSharedValue,
  withRepeat,
  withSequence,
  withSpring,
  withTiming,
} from "react-native-reanimated"
import Svg, { Path } from "react-native-svg"
import { useHaptics } from "@/components/primitives/haptics"
import { useEffectEvent } from "@/components/primitives/hooks"
import { AnimatedView } from "@/components/ui/animated-view"
import { Icon } from "@/components/ui/icon"
import { Text } from "@/components/ui/text"

type QRScannerState = "idle" | "success" | "error"

const FRAME_RADIUS = 32

const FRAME_LIFT = 24

const BRACKET_ARM = 48

const BRACKET_WIDTH = 6

const BRACKET_PAD = BRACKET_WIDTH

const SUCCESS_SCALE = 0.94

const SHAKE_DURATION = 400

const LINE_INSET = 24

const LINE_HEIGHT = 2

const BRACKET_COLOR: Record<QRScannerState, string> = {
  idle: "text-on-media",
  success: "text-success",
  error: "text-danger",
}

const AnimatedPath = Animated.createAnimatedComponent(Path)

function surroundPath(
  width: number,
  height: number,
  left: number,
  top: number,
  size: number,
  radius: number
) {
  const r = Math.min(radius, size / 2)
  const right = left + size
  const bottom = top + size
  return [
    `M0 0H${width}V${height}H0Z`,
    `M${left + r} ${top}H${right - r}`,
    `A${r} ${r} 0 0 1 ${right} ${top + r}V${bottom - r}`,
    `A${r} ${r} 0 0 1 ${right - r} ${bottom}H${left + r}`,
    `A${r} ${r} 0 0 1 ${left} ${bottom - r}V${top + r}`,
    `A${r} ${r} 0 0 1 ${left + r} ${top}Z`,
  ].join("")
}

function bracketPath(size: number, radius: number, arm: number, pad: number) {
  const r = Math.min(radius, size / 2)
  const a = Math.max(r, Math.min(arm, size / 2))
  const s = size + pad
  const p = pad
  return [
    `M${p} ${p + a}V${p + r}A${r} ${r} 0 0 1 ${p + r} ${p}H${p + a}`,
    `M${s - a} ${p}H${s - r}A${r} ${r} 0 0 1 ${s} ${p + r}V${p + a}`,
    `M${s} ${s - a}V${s - r}A${r} ${r} 0 0 1 ${s - r} ${s}H${s - a}`,
    `M${p + a} ${s}H${p + r}A${r} ${r} 0 0 1 ${p} ${s - r}V${s - a}`,
  ].join("")
}

const SurroundContext = React.createContext("")

const BracketContext = React.createContext(0)

function QRScannerSurround({ color }: PhosphorIconProps) {
  const path = React.useContext(SurroundContext)
  return (
    <Svg width="100%" height="100%">
      <Path d={path} fill={color} fillRule="evenodd" />
    </Svg>
  )
}

function QRScannerBrackets({ color = "transparent" }: PhosphorIconProps) {
  const size = React.useContext(BracketContext)
  const stroke = useSharedValue(color)
  const box = size + BRACKET_PAD * 2

  React.useEffect(() => {
    stroke.value = withTiming(color, { duration: 250 })
  }, [color, stroke])

  const animatedProps = useAnimatedProps(() => ({ stroke: stroke.value }))

  return (
    <Svg width={box} height={box}>
      <AnimatedPath
        d={bracketPath(size, FRAME_RADIUS, BRACKET_ARM, BRACKET_PAD)}
        fill="none"
        strokeWidth={BRACKET_WIDTH}
        strokeLinecap="round"
        strokeLinejoin="round"
        animatedProps={animatedProps}
      />
    </Svg>
  )
}

function wrapText(children: React.ReactNode, className: string) {
  if (typeof children === "string" || typeof children === "number") {
    return <Text className={className}>{children}</Text>
  }
  return children
}

function QRScanner({
  state = "idle",
  title,
  description,
  scanLine = false,
  torch = false,
  onTorchToggle,
  torchLabel = "Flashlight",
  frameSize: frameSizeProp,
  className,
  children,
  ...props
}: React.ComponentProps<typeof View> & {
  state?: QRScannerState
  title?: React.ReactNode
  description?: React.ReactNode
  scanLine?: boolean
  torch?: boolean
  onTorchToggle?: (torch: boolean) => void
  torchLabel?: string
  frameSize?: number
}) {
  const [layout, setLayout] = React.useState({ width: 0, height: 0 })
  const frameSize =
    frameSizeProp ??
    Math.min(260, Math.round(Math.min(layout.width, layout.height) * 0.66))
  const frameTop = Math.max(0, (layout.height - frameSize) / 2 - FRAME_LIFT)
  const frameLeft = Math.max(0, (layout.width - frameSize) / 2)
  const reduceMotion = useReducedMotion()
  const offset = useSharedValue(0)
  const scale = useSharedValue(
    state === "success" && !reduceMotion ? SUCCESS_SCALE : 1
  )
  const line = useSharedValue(0)
  const previousState = React.useRef(state)
  const haptics = useHaptics()
  const scanning = scanLine && state === "idle" && frameSize > 0

  const onError = useEffectEvent(() => {
    const step = {
      duration: SHAKE_DURATION / 6,
      reduceMotion: ReduceMotion.System,
    }
    offset.value = withSequence(
      withTiming(-12, step),
      withTiming(10, step),
      withTiming(-8, step),
      withTiming(6, step),
      withTiming(-3, step),
      withTiming(0, step)
    )
  })

  React.useEffect(() => {
    const previous = previousState.current
    previousState.current = state
    if (state === previous) return
    if (state === "error") {
      haptics.notification("error")
      onError()
    } else if (state === "success") {
      haptics.notification("success")
    }
  }, [state, onError, haptics])

  React.useEffect(() => {
    const target = state === "success" && !reduceMotion ? SUCCESS_SCALE : 1
    scale.value = withSpring(target, {
      duration: 350,
      dampingRatio: 0.6,
    })
  }, [state, reduceMotion, scale])

  React.useEffect(() => {
    if (!scanning) {
      cancelAnimation(line)
      line.value = 0
      return
    }
    line.value = 0
    line.value = withRepeat(
      withTiming(1, {
        duration: 1800,
        easing: Easing.inOut(Easing.quad),
        reduceMotion: ReduceMotion.System,
      }),
      -1,
      true
    )
    return () => cancelAnimation(line)
  }, [scanning, line])

  const frameStyle = useAnimatedStyle(() => ({
    transform: [{ translateX: offset.value }, { scale: scale.value }],
  }))

  const lineTravel = Math.max(0, frameSize - LINE_INSET * 2 - LINE_HEIGHT)

  const lineStyle = useAnimatedStyle(() => ({
    transform: [{ translateY: line.value * lineTravel }],
  }))

  return (
    <View
      onLayout={(event) =>
        setLayout({
          width: event.nativeEvent.layout.width,
          height: event.nativeEvent.layout.height,
        })
      }
      className={cn(
        "relative overflow-hidden",
        children == null && "bg-media",
        className
      )}
      {...props}
    >
      <View className="absolute inset-0">{children}</View>
      {frameSize > 0 ? (
        <View
          pointerEvents="box-none"
          className="absolute inset-0"
          accessibilityLiveRegion="polite"
        >
          <View
            pointerEvents="none"
            accessibilityElementsHidden
            importantForAccessibility="no-hide-descendants"
            className="absolute inset-0"
          >
            <SurroundContext.Provider
              value={surroundPath(
                layout.width,
                layout.height,
                frameLeft,
                frameTop,
                frameSize,
                FRAME_RADIUS
              )}
            >
              <Icon as={QRScannerSurround} className="text-scrim" />
            </SurroundContext.Provider>
          </View>
          <AnimatedView
            pointerEvents="none"
            accessibilityElementsHidden
            importantForAccessibility="no-hide-descendants"
            className="absolute"
            style={[
              {
                top: frameTop,
                left: frameLeft,
                width: frameSize,
                height: frameSize,
              },
              frameStyle,
            ]}
          >
            <View
              className="absolute"
              style={{ top: -BRACKET_PAD, left: -BRACKET_PAD }}
            >
              <BracketContext.Provider value={frameSize}>
                <Icon as={QRScannerBrackets} className={BRACKET_COLOR[state]} />
              </BracketContext.Provider>
            </View>
            {scanning ? (
              <AnimatedView
                className="absolute h-0.5 rounded-full bg-accent"
                style={[
                  { top: LINE_INSET, left: LINE_INSET, right: LINE_INSET },
                  lineStyle,
                ]}
              />
            ) : null}
          </AnimatedView>
          {title !== undefined ? (
            <View
              pointerEvents="none"
              className="absolute inset-x-6 items-center"
              style={{ bottom: layout.height - frameTop + 32 }}
            >
              {wrapText(
                title,
                "text-center text-lg font-semibold text-on-media"
              )}
            </View>
          ) : null}
          {description !== undefined ? (
            <View
              pointerEvents="box-none"
              className="absolute inset-x-6 items-center"
              style={{ top: frameTop + frameSize + 20 }}
            >
              <View pointerEvents="box-none" className="max-w-[280px]">
                {wrapText(description, "text-center text-sm text-on-media")}
              </View>
            </View>
          ) : null}
          {onTorchToggle ? (
            <View
              pointerEvents="box-none"
              className="absolute inset-x-0 bottom-12 items-center"
            >
              <Pressable
                role="button"
                accessibilityLabel={torchLabel}
                accessibilityState={{ selected: torch }}
                hitSlop={8}
                onPress={() => onTorchToggle(!torch)}
                className={cn(
                  "size-14 items-center justify-center rounded-full",
                  "active:opacity-70",
                  torch ? "bg-on-media" : "bg-scrim"
                )}
              >
                <Icon
                  as={FlashlightIcon}
                  weight={torch ? "fill" : "regular"}
                  className={cn(
                    "size-6",
                    torch ? "text-media" : "text-on-media"
                  )}
                />
              </Pressable>
            </View>
          ) : null}
        </View>
      ) : null}
    </View>
  )
}

export type { QRScannerState }
export { QRScanner }
```

4. Update the import paths to match your project.

**NativeWind**

1. Install the dependencies:

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

2. Add the pieces it builds on: [Icon](/docs/components/icon), [Text](/docs/components/text), and the primitives `components/primitives/haptics.tsx`, `components/primitives/hooks.tsx`.

3. Copy the source into `components/ui/qr-scanner.tsx`:

```tsx title="nativewind/components/ui/qr-scanner.tsx"
import { cn } from "cn"
import {
  FlashlightIcon,
  type IconProps as PhosphorIconProps,
} from "phosphor-react-native"
import * as React from "react"
import { Pressable, View } from "react-native"
import Animated, {
  cancelAnimation,
  Easing,
  ReduceMotion,
  useAnimatedProps,
  useAnimatedStyle,
  useReducedMotion,
  useSharedValue,
  withRepeat,
  withSequence,
  withSpring,
  withTiming,
} from "react-native-reanimated"
import Svg, { Path } from "react-native-svg"
import { useHaptics } from "@/components/primitives/haptics"
import { useEffectEvent } from "@/components/primitives/hooks"
import { AnimatedView } from "@/components/ui/animated-view"
import { Icon } from "@/components/ui/icon"
import { Text } from "@/components/ui/text"

type QRScannerState = "idle" | "success" | "error"

const FRAME_RADIUS = 32

const FRAME_LIFT = 24

const BRACKET_ARM = 48

const BRACKET_WIDTH = 6

const BRACKET_PAD = BRACKET_WIDTH

const SUCCESS_SCALE = 0.94

const SHAKE_DURATION = 400

const LINE_INSET = 24

const LINE_HEIGHT = 2

const BRACKET_COLOR: Record<QRScannerState, string> = {
  idle: "text-on-media",
  success: "text-success",
  error: "text-danger",
}

const AnimatedPath = Animated.createAnimatedComponent(Path)

function surroundPath(
  width: number,
  height: number,
  left: number,
  top: number,
  size: number,
  radius: number
) {
  const r = Math.min(radius, size / 2)
  const right = left + size
  const bottom = top + size
  return [
    `M0 0H${width}V${height}H0Z`,
    `M${left + r} ${top}H${right - r}`,
    `A${r} ${r} 0 0 1 ${right} ${top + r}V${bottom - r}`,
    `A${r} ${r} 0 0 1 ${right - r} ${bottom}H${left + r}`,
    `A${r} ${r} 0 0 1 ${left} ${bottom - r}V${top + r}`,
    `A${r} ${r} 0 0 1 ${left + r} ${top}Z`,
  ].join("")
}

function bracketPath(size: number, radius: number, arm: number, pad: number) {
  const r = Math.min(radius, size / 2)
  const a = Math.max(r, Math.min(arm, size / 2))
  const s = size + pad
  const p = pad
  return [
    `M${p} ${p + a}V${p + r}A${r} ${r} 0 0 1 ${p + r} ${p}H${p + a}`,
    `M${s - a} ${p}H${s - r}A${r} ${r} 0 0 1 ${s} ${p + r}V${p + a}`,
    `M${s} ${s - a}V${s - r}A${r} ${r} 0 0 1 ${s - r} ${s}H${s - a}`,
    `M${p + a} ${s}H${p + r}A${r} ${r} 0 0 1 ${p} ${s - r}V${s - a}`,
  ].join("")
}

const SurroundContext = React.createContext("")

const BracketContext = React.createContext(0)

function QRScannerSurround({ color }: PhosphorIconProps) {
  const path = React.useContext(SurroundContext)
  return (
    <Svg width="100%" height="100%">
      <Path d={path} fill={color} fillRule="evenodd" />
    </Svg>
  )
}

function QRScannerBrackets({ color = "transparent" }: PhosphorIconProps) {
  const size = React.useContext(BracketContext)
  const stroke = useSharedValue(color)
  const box = size + BRACKET_PAD * 2

  React.useEffect(() => {
    stroke.value = withTiming(color, { duration: 250 })
  }, [color, stroke])

  const animatedProps = useAnimatedProps(() => ({ stroke: stroke.value }))

  return (
    <Svg width={box} height={box}>
      <AnimatedPath
        d={bracketPath(size, FRAME_RADIUS, BRACKET_ARM, BRACKET_PAD)}
        fill="none"
        strokeWidth={BRACKET_WIDTH}
        strokeLinecap="round"
        strokeLinejoin="round"
        animatedProps={animatedProps}
      />
    </Svg>
  )
}

function wrapText(children: React.ReactNode, className: string) {
  if (typeof children === "string" || typeof children === "number") {
    return <Text className={className}>{children}</Text>
  }
  return children
}

function QRScanner({
  state = "idle",
  title,
  description,
  scanLine = false,
  torch = false,
  onTorchToggle,
  torchLabel = "Flashlight",
  frameSize: frameSizeProp,
  className,
  children,
  ...props
}: React.ComponentProps<typeof View> & {
  state?: QRScannerState
  title?: React.ReactNode
  description?: React.ReactNode
  scanLine?: boolean
  torch?: boolean
  onTorchToggle?: (torch: boolean) => void
  torchLabel?: string
  frameSize?: number
}) {
  const [layout, setLayout] = React.useState({ width: 0, height: 0 })
  const frameSize =
    frameSizeProp ??
    Math.min(260, Math.round(Math.min(layout.width, layout.height) * 0.66))
  const frameTop = Math.max(0, (layout.height - frameSize) / 2 - FRAME_LIFT)
  const frameLeft = Math.max(0, (layout.width - frameSize) / 2)
  const reduceMotion = useReducedMotion()
  const offset = useSharedValue(0)
  const scale = useSharedValue(
    state === "success" && !reduceMotion ? SUCCESS_SCALE : 1
  )
  const line = useSharedValue(0)
  const previousState = React.useRef(state)
  const haptics = useHaptics()
  const scanning = scanLine && state === "idle" && frameSize > 0

  const onError = useEffectEvent(() => {
    const step = {
      duration: SHAKE_DURATION / 6,
      reduceMotion: ReduceMotion.System,
    }
    offset.value = withSequence(
      withTiming(-12, step),
      withTiming(10, step),
      withTiming(-8, step),
      withTiming(6, step),
      withTiming(-3, step),
      withTiming(0, step)
    )
  })

  React.useEffect(() => {
    const previous = previousState.current
    previousState.current = state
    if (state === previous) return
    if (state === "error") {
      haptics.notification("error")
      onError()
    } else if (state === "success") {
      haptics.notification("success")
    }
  }, [state, onError, haptics])

  React.useEffect(() => {
    const target = state === "success" && !reduceMotion ? SUCCESS_SCALE : 1
    scale.value = withSpring(target, {
      duration: 350,
      dampingRatio: 0.6,
    })
  }, [state, reduceMotion, scale])

  React.useEffect(() => {
    if (!scanning) {
      cancelAnimation(line)
      line.value = 0
      return
    }
    line.value = 0
    line.value = withRepeat(
      withTiming(1, {
        duration: 1800,
        easing: Easing.inOut(Easing.quad),
        reduceMotion: ReduceMotion.System,
      }),
      -1,
      true
    )
    return () => cancelAnimation(line)
  }, [scanning, line])

  const frameStyle = useAnimatedStyle(() => ({
    transform: [{ translateX: offset.value }, { scale: scale.value }],
  }))

  const lineTravel = Math.max(0, frameSize - LINE_INSET * 2 - LINE_HEIGHT)

  const lineStyle = useAnimatedStyle(() => ({
    transform: [{ translateY: line.value * lineTravel }],
  }))

  return (
    <View
      onLayout={(event) =>
        setLayout({
          width: event.nativeEvent.layout.width,
          height: event.nativeEvent.layout.height,
        })
      }
      className={cn(
        "relative overflow-hidden",
        children == null && "bg-media",
        className
      )}
      {...props}
    >
      <View className="absolute inset-0">{children}</View>
      {frameSize > 0 ? (
        <View
          pointerEvents="box-none"
          className="absolute inset-0"
          accessibilityLiveRegion="polite"
        >
          <View
            pointerEvents="none"
            accessibilityElementsHidden
            importantForAccessibility="no-hide-descendants"
            className="absolute inset-0"
          >
            <SurroundContext.Provider
              value={surroundPath(
                layout.width,
                layout.height,
                frameLeft,
                frameTop,
                frameSize,
                FRAME_RADIUS
              )}
            >
              <Icon as={QRScannerSurround} className="text-scrim" />
            </SurroundContext.Provider>
          </View>
          <AnimatedView
            pointerEvents="none"
            accessibilityElementsHidden
            importantForAccessibility="no-hide-descendants"
            className="absolute"
            style={[
              {
                top: frameTop,
                left: frameLeft,
                width: frameSize,
                height: frameSize,
              },
              frameStyle,
            ]}
          >
            <View
              className="absolute"
              style={{ top: -BRACKET_PAD, left: -BRACKET_PAD }}
            >
              <BracketContext.Provider value={frameSize}>
                <Icon as={QRScannerBrackets} className={BRACKET_COLOR[state]} />
              </BracketContext.Provider>
            </View>
            {scanning ? (
              <AnimatedView
                className="absolute h-0.5 rounded-full bg-accent"
                style={[
                  { top: LINE_INSET, left: LINE_INSET, right: LINE_INSET },
                  lineStyle,
                ]}
              />
            ) : null}
          </AnimatedView>
          {title !== undefined ? (
            <View
              pointerEvents="none"
              className="absolute inset-x-6 items-center"
              style={{ bottom: layout.height - frameTop + 32 }}
            >
              {wrapText(
                title,
                "text-center text-lg font-semibold text-on-media"
              )}
            </View>
          ) : null}
          {description !== undefined ? (
            <View
              pointerEvents="box-none"
              className="absolute inset-x-6 items-center"
              style={{ top: frameTop + frameSize + 20 }}
            >
              <View pointerEvents="box-none" className="max-w-[280px]">
                {wrapText(description, "text-center text-sm text-on-media")}
              </View>
            </View>
          ) : null}
          {onTorchToggle ? (
            <View
              pointerEvents="box-none"
              className="absolute inset-x-0 bottom-12 items-center"
            >
              <Pressable
                role="button"
                accessibilityLabel={torchLabel}
                accessibilityState={{ selected: torch }}
                hitSlop={8}
                onPress={() => onTorchToggle(!torch)}
                className={cn(
                  "size-14 items-center justify-center rounded-full",
                  "active:opacity-70",
                  torch ? "bg-on-media" : "bg-scrim"
                )}
              >
                <Icon
                  as={FlashlightIcon}
                  weight={torch ? "fill" : "regular"}
                  className={cn(
                    "size-6",
                    torch ? "text-media" : "text-on-media"
                  )}
                />
              </Pressable>
            </View>
          ) : null}
        </View>
      ) : null}
    </View>
  )
}

export type { QRScannerState }
export { QRScanner }
```

4. Update the import paths to match your project.

**StyleSheet**

1. Install the dependencies:

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

2. Add the pieces it builds on: [Icon](/docs/components/icon), [Text](/docs/components/text), and the primitives `components/primitives/haptics.tsx`, `components/primitives/hooks.tsx`.

3. Copy the source into `components/ui/qr-scanner.tsx`:

```tsx title="stylesheet/components/ui/qr-scanner.tsx"
import { FlashlightIcon } from "phosphor-react-native"
import * as React from "react"
import {
  Pressable,
  type StyleProp,
  StyleSheet,
  type TextStyle,
  View,
  type ViewStyle,
} from "react-native"
import Animated, {
  cancelAnimation,
  Easing,
  ReduceMotion,
  useAnimatedProps,
  useAnimatedStyle,
  useReducedMotion,
  useSharedValue,
  withRepeat,
  withSequence,
  withSpring,
  withTiming,
} from "react-native-reanimated"
import Svg, { Path } from "react-native-svg"
import { useHaptics } from "@/components/primitives/haptics"
import { useEffectEvent } from "@/components/primitives/hooks"
import { AnimatedView } from "@/components/ui/animated-view"
import { Icon } from "@/components/ui/icon"
import { Text } from "@/components/ui/text"
import {
  fontSize,
  radius,
  type ThemeColors,
  useTheme,
} from "@/components/ui/theme"

type QRScannerState = "idle" | "success" | "error"

const FRAME_RADIUS = 32

const FRAME_LIFT = 24

const BRACKET_ARM = 48

const BRACKET_WIDTH = 6

const BRACKET_PAD = BRACKET_WIDTH

const SUCCESS_SCALE = 0.94

const SHAKE_DURATION = 400

const LINE_INSET = 24

const LINE_HEIGHT = 2

const AnimatedPath = Animated.createAnimatedComponent(Path)

function surroundPath(
  width: number,
  height: number,
  left: number,
  top: number,
  size: number,
  radius: number
) {
  const r = Math.min(radius, size / 2)
  const right = left + size
  const bottom = top + size
  return [
    `M0 0H${width}V${height}H0Z`,
    `M${left + r} ${top}H${right - r}`,
    `A${r} ${r} 0 0 1 ${right} ${top + r}V${bottom - r}`,
    `A${r} ${r} 0 0 1 ${right - r} ${bottom}H${left + r}`,
    `A${r} ${r} 0 0 1 ${left} ${bottom - r}V${top + r}`,
    `A${r} ${r} 0 0 1 ${left + r} ${top}Z`,
  ].join("")
}

function bracketPath(size: number, radius: number, arm: number, pad: number) {
  const r = Math.min(radius, size / 2)
  const a = Math.max(r, Math.min(arm, size / 2))
  const s = size + pad
  const p = pad
  return [
    `M${p} ${p + a}V${p + r}A${r} ${r} 0 0 1 ${p + r} ${p}H${p + a}`,
    `M${s - a} ${p}H${s - r}A${r} ${r} 0 0 1 ${s} ${p + r}V${p + a}`,
    `M${s} ${s - a}V${s - r}A${r} ${r} 0 0 1 ${s - r} ${s}H${s - a}`,
    `M${p + a} ${s}H${p + r}A${r} ${r} 0 0 1 ${p} ${s - r}V${s - a}`,
  ].join("")
}

function bracketColor(state: QRScannerState, colors: ThemeColors) {
  if (state === "success") return colors.success
  if (state === "error") return colors.danger
  return colors.onMedia
}

const styles = StyleSheet.create({
  root: { position: "relative", overflow: "hidden" },
  absolute: { position: "absolute" },
  brackets: { position: "absolute", top: -BRACKET_PAD, left: -BRACKET_PAD },
  line: {
    position: "absolute",
    left: LINE_INSET,
    right: LINE_INSET,
    top: LINE_INSET,
    height: LINE_HEIGHT,
    borderRadius: radius.full,
  },
  title: { position: "absolute", left: 24, right: 24, alignItems: "center" },
  titleText: { ...fontSize.lg, fontWeight: "600", textAlign: "center" },
  footer: { position: "absolute", left: 24, right: 24, alignItems: "center" },
  descriptionBox: { maxWidth: 280 },
  description: { ...fontSize.sm, textAlign: "center" },
  torchRow: {
    position: "absolute",
    left: 0,
    right: 0,
    bottom: 48,
    alignItems: "center",
  },
  torch: {
    width: 56,
    height: 56,
    alignItems: "center",
    justifyContent: "center",
    borderRadius: radius.full,
  },
})

function QRScannerBrackets({ size, color }: { size: number; color: string }) {
  const stroke = useSharedValue(color)
  const box = size + BRACKET_PAD * 2

  React.useEffect(() => {
    stroke.value = withTiming(color, { duration: 250 })
  }, [color, stroke])

  const animatedProps = useAnimatedProps(() => ({ stroke: stroke.value }))

  return (
    <Svg width={box} height={box}>
      <AnimatedPath
        d={bracketPath(size, FRAME_RADIUS, BRACKET_ARM, BRACKET_PAD)}
        fill="none"
        strokeWidth={BRACKET_WIDTH}
        strokeLinecap="round"
        strokeLinejoin="round"
        animatedProps={animatedProps}
      />
    </Svg>
  )
}

function wrapText(children: React.ReactNode, style: StyleProp<TextStyle>) {
  if (typeof children === "string" || typeof children === "number") {
    return <Text style={style}>{children}</Text>
  }
  return children
}

function QRScanner({
  state = "idle",
  title,
  description,
  scanLine = false,
  torch = false,
  onTorchToggle,
  torchLabel = "Flashlight",
  frameSize: frameSizeProp,
  style,
  children,
  ...props
}: Omit<React.ComponentProps<typeof View>, "style"> & {
  style?: StyleProp<ViewStyle>
  state?: QRScannerState
  title?: React.ReactNode
  description?: React.ReactNode
  scanLine?: boolean
  torch?: boolean
  onTorchToggle?: (torch: boolean) => void
  torchLabel?: string
  frameSize?: number
}) {
  const { colors } = useTheme()
  const [layout, setLayout] = React.useState({ width: 0, height: 0 })
  const frameSize =
    frameSizeProp ??
    Math.min(260, Math.round(Math.min(layout.width, layout.height) * 0.66))
  const frameTop = Math.max(0, (layout.height - frameSize) / 2 - FRAME_LIFT)
  const frameLeft = Math.max(0, (layout.width - frameSize) / 2)
  const reduceMotion = useReducedMotion()
  const offset = useSharedValue(0)
  const scale = useSharedValue(
    state === "success" && !reduceMotion ? SUCCESS_SCALE : 1
  )
  const line = useSharedValue(0)
  const previousState = React.useRef(state)
  const haptics = useHaptics()
  const scanning = scanLine && state === "idle" && frameSize > 0

  const onError = useEffectEvent(() => {
    const step = {
      duration: SHAKE_DURATION / 6,
      reduceMotion: ReduceMotion.System,
    }
    offset.value = withSequence(
      withTiming(-12, step),
      withTiming(10, step),
      withTiming(-8, step),
      withTiming(6, step),
      withTiming(-3, step),
      withTiming(0, step)
    )
  })

  React.useEffect(() => {
    const previous = previousState.current
    previousState.current = state
    if (state === previous) return
    if (state === "error") {
      haptics.notification("error")
      onError()
    } else if (state === "success") {
      haptics.notification("success")
    }
  }, [state, onError, haptics])

  React.useEffect(() => {
    const target = state === "success" && !reduceMotion ? SUCCESS_SCALE : 1
    scale.value = withSpring(target, {
      duration: 350,
      dampingRatio: 0.6,
    })
  }, [state, reduceMotion, scale])

  React.useEffect(() => {
    if (!scanning) {
      cancelAnimation(line)
      line.value = 0
      return
    }
    line.value = 0
    line.value = withRepeat(
      withTiming(1, {
        duration: 1800,
        easing: Easing.inOut(Easing.quad),
        reduceMotion: ReduceMotion.System,
      }),
      -1,
      true
    )
    return () => cancelAnimation(line)
  }, [scanning, line])

  const frameStyle = useAnimatedStyle(() => ({
    transform: [{ translateX: offset.value }, { scale: scale.value }],
  }))

  const lineTravel = Math.max(0, frameSize - LINE_INSET * 2 - LINE_HEIGHT)

  const lineStyle = useAnimatedStyle(() => ({
    transform: [{ translateY: line.value * lineTravel }],
  }))

  return (
    <View
      onLayout={(event) =>
        setLayout({
          width: event.nativeEvent.layout.width,
          height: event.nativeEvent.layout.height,
        })
      }
      style={[
        styles.root,
        children == null && { backgroundColor: colors.media },
        style,
      ]}
      {...props}
    >
      <View style={StyleSheet.absoluteFill}>{children}</View>
      {frameSize > 0 ? (
        <View
          pointerEvents="box-none"
          style={StyleSheet.absoluteFill}
          accessibilityLiveRegion="polite"
        >
          <Svg
            pointerEvents="none"
            accessibilityElementsHidden
            importantForAccessibility="no-hide-descendants"
            width={layout.width}
            height={layout.height}
            style={StyleSheet.absoluteFill}
          >
            <Path
              d={surroundPath(
                layout.width,
                layout.height,
                frameLeft,
                frameTop,
                frameSize,
                FRAME_RADIUS
              )}
              fill={colors.scrim}
              fillRule="evenodd"
            />
          </Svg>
          <AnimatedView
            pointerEvents="none"
            accessibilityElementsHidden
            importantForAccessibility="no-hide-descendants"
            style={[
              styles.absolute,
              {
                top: frameTop,
                left: frameLeft,
                width: frameSize,
                height: frameSize,
              },
              frameStyle,
            ]}
          >
            <View style={styles.brackets}>
              <QRScannerBrackets
                size={frameSize}
                color={bracketColor(state, colors)}
              />
            </View>
            {scanning ? (
              <AnimatedView
                style={[
                  styles.line,
                  { backgroundColor: colors.accent },
                  lineStyle,
                ]}
              />
            ) : null}
          </AnimatedView>
          {title !== undefined ? (
            <View
              pointerEvents="none"
              style={[styles.title, { bottom: layout.height - frameTop + 32 }]}
            >
              {wrapText(title, [styles.titleText, { color: colors.onMedia }])}
            </View>
          ) : null}
          {description !== undefined ? (
            <View
              pointerEvents="box-none"
              style={[styles.footer, { top: frameTop + frameSize + 20 }]}
            >
              <View pointerEvents="box-none" style={styles.descriptionBox}>
                {wrapText(description, [
                  styles.description,
                  { color: colors.onMedia },
                ])}
              </View>
            </View>
          ) : null}
          {onTorchToggle ? (
            <View pointerEvents="box-none" style={styles.torchRow}>
              <Pressable
                role="button"
                accessibilityLabel={torchLabel}
                accessibilityState={{ selected: torch }}
                hitSlop={8}
                onPress={() => onTorchToggle(!torch)}
                style={({ pressed }) => [
                  styles.torch,
                  {
                    backgroundColor: torch ? colors.onMedia : colors.scrim,
                    opacity: pressed ? 0.7 : 1,
                  },
                ]}
              >
                <Icon
                  as={FlashlightIcon}
                  weight={torch ? "fill" : "regular"}
                  size={24}
                  color={torch ? colors.media : colors.onMedia}
                />
              </Pressable>
            </View>
          ) : null}
        </View>
      ) : null}
    </View>
  )
}

export type { QRScannerState }
export { QRScanner }
```

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/Components/QRScanner.swift"
import PhosphorSwift
import SwiftUI

public enum QRScannerState: CaseIterable, Sendable {
  case idle, success, error
}

enum QRScannerMath {
  static let radius: CGFloat = 32
  static let arm: CGFloat = 48
  static let lift: CGFloat = 24

  static func side(in size: CGSize, frameSize: CGFloat? = nil) -> CGFloat {
    if let frameSize { return max(0, frameSize) }
    return max(0, min(260, (min(size.width, size.height) * 0.66).rounded()))
  }

  static func frame(in size: CGSize, frameSize: CGFloat? = nil) -> CGRect {
    let side = side(in: size, frameSize: frameSize)
    return CGRect(
      x: (size.width - side) / 2,
      y: max(0, (size.height - side) / 2 - lift),
      width: side,
      height: side
    )
  }

  static func cutout(in size: CGSize, frame: CGRect) -> Path {
    var path = Path(CGRect(origin: .zero, size: size))
    let r = min(radius, frame.width / 2)
    path.addPath(Path(roundedRect: frame, cornerRadius: r, style: .circular))
    return path
  }

  static func brackets(side: CGFloat) -> Path {
    var path = Path()
    let r = min(radius, side / 2)
    let length = max(r, min(arm, side / 2))
    let corners: [(CGPoint, CGFloat, CGFloat)] = [
      (CGPoint(x: 0, y: 0), 1, 1),
      (CGPoint(x: side, y: 0), -1, 1),
      (CGPoint(x: side, y: side), -1, -1),
      (CGPoint(x: 0, y: side), 1, -1),
    ]
    for (corner, dx, dy) in corners {
      path.move(to: CGPoint(x: corner.x, y: corner.y + dy * length))
      path.addLine(to: CGPoint(x: corner.x, y: corner.y + dy * r))
      path.addArc(tangent1End: corner, tangent2End: CGPoint(x: corner.x + dx * r, y: corner.y), radius: r)
      path.addLine(to: CGPoint(x: corner.x + dx * length, y: corner.y))
    }
    return path
  }
}

public struct QRScanner<Preview: View>: View {
  let state: QRScannerState
  let title: Text?
  let hint: Text?
  let scanLine: Bool
  let isTorchOn: Bool
  let onTorchToggle: (() -> Void)?
  let frameSize: CGFloat?
  let preview: Preview

  @State private var shakes = 0
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  public init(
    state: QRScannerState = .idle,
    title: LocalizedStringKey? = nil,
    hint: LocalizedStringKey? = nil,
    scanLine: Bool = false,
    isTorchOn: Bool = false,
    onTorchToggle: (() -> Void)? = nil,
    frameSize: CGFloat? = nil,
    @ViewBuilder preview: () -> Preview
  ) {
    self.state = state
    self.title = title.map { Text($0) }
    self.hint = hint.map { Text($0) }
    self.scanLine = scanLine
    self.isTorchOn = isTorchOn
    self.onTorchToggle = onTorchToggle
    self.frameSize = frameSize
    self.preview = preview()
  }

  public var body: some View {
    ZStack {
      preview
      GeometryReader { proxy in
        let size = proxy.size
        let frame = QRScannerMath.frame(in: size, frameSize: frameSize)
        ZStack(alignment: .topLeading) {
          QRScannerMath.cutout(in: size, frame: frame)
            .fill(Color.scrim, style: FillStyle(eoFill: true))
          ZStack {
            QRScannerMath.brackets(side: frame.width)
              .stroke(color, style: StrokeStyle(lineWidth: 6, lineCap: .round, lineJoin: .round))
              .animation(.easeOut(duration: 0.2), value: state)
            if scanLine && state == .idle && frame.width > 48 {
              QRScannerLine(side: frame.width)
            }
          }
          .frame(width: frame.width, height: frame.height)
          .scaleEffect(state == .success && !reduceMotion ? 0.94 : 1)
          .animation(.spring(duration: 0.35, bounce: 0.3), value: state)
          .shake(trigger: shakes)
          .offset(x: frame.minX, y: frame.minY)
          if let title {
            title
              .scaledTextStyle(.lg, weight: .semibold)
              .foregroundStyle(Color.onMedia)
              .multilineTextAlignment(.center)
              .frame(width: max(size.width - 48, 0))
              .frame(height: max(frame.minY - 32, 0), alignment: .bottom)
              .offset(x: 24)
          }
          if let hint {
            hint
              .scaledTextStyle(.sm)
              .foregroundStyle(Color.onMedia)
              .multilineTextAlignment(.center)
              .fixedSize(horizontal: false, vertical: true)
              .frame(maxWidth: min(280, size.width))
              .frame(width: size.width)
              .offset(y: frame.maxY + 20)
          }
          if let onTorchToggle {
            Button(action: onTorchToggle) {
              (isTorchOn ? Ph.flashlight.fill : Ph.flashlight.regular)
                .frame(width: 24, height: 24)
                .foregroundStyle(isTorchOn ? Color.media : Color.onMedia)
                .frame(width: 56, height: 56)
                .background(isTorchOn ? Color.onMedia : Color.scrim, in: Circle())
                .contentShape(Circle())
            }
            .buttonStyle(QRScannerTorchStyle())
            .accessibilityLabel(Text(isTorchOn ? "Turn off flashlight" : "Turn on flashlight"))
            .accessibilityAddTraits(isTorchOn ? .isSelected : [])
            .frame(width: size.width)
            .offset(y: max(size.height - 48 - 56, 0))
          }
        }
      }
    }
    .clipped()
    .onChange(of: state) { _, value in
      if value == .error { shakes += 1 }
    }
    .hapticFeedback(.success, trigger: state) { _, new in new == .success }
    .hapticFeedback(.error, trigger: state) { _, new in new == .error }
    .accessibilityElement(children: .contain)
  }

  private var color: Color {
    switch state {
    case .idle: .onMedia
    case .success: .success
    case .error: .danger
    }
  }
}

extension QRScanner where Preview == Color {
  public init(
    state: QRScannerState = .idle,
    title: LocalizedStringKey? = nil,
    hint: LocalizedStringKey? = nil,
    scanLine: Bool = false,
    isTorchOn: Bool = false,
    onTorchToggle: (() -> Void)? = nil,
    frameSize: CGFloat? = nil
  ) {
    self.init(
      state: state,
      title: title,
      hint: hint,
      scanLine: scanLine,
      isTorchOn: isTorchOn,
      onTorchToggle: onTorchToggle,
      frameSize: frameSize
    ) {
      Color.clear
    }
  }
}

private struct QRScannerLine: View {
  let side: CGFloat

  @State private var down = false
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  var body: some View {
    let travel = side / 2 - 24
    Capsule()
      .fill(Color.accent)
      .frame(height: 2)
      .padding(.horizontal, 24)
      .offset(y: reduceMotion ? 0 : (down ? travel : -travel))
      .onAppear {
        guard !reduceMotion else { return }
        withAnimation(.easeInOut(duration: 1.8).repeatForever(autoreverses: true)) { down = true }
      }
      .accessibilityHidden(true)
  }
}

private struct QRScannerTorchStyle: ButtonStyle {
  func makeBody(configuration: Configuration) -> some View {
    configuration.label
      .opacity(configuration.isPressed ? 0.7 : 1)
      .animation(.easeOut(duration: 0.15), value: configuration.isPressed)
  }
}
```

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

enum ButtonGroupSpace: Hashable {
  case group
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

private struct ButtonGroupClip: ViewModifier {
  let shape: AnyShape?

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

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

  @Environment(\.buttonGroup) private var group

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

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

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

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

public struct ButtonGroupSeparator: View {
  let orientation: Axis

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

extension View {
  public func dialog<Content: View>(
    isPresented: Binding<Bool>,
    @ViewBuilder content: @escaping () -> Content
  ) -> some View {
    modifier(
      CoverPresenter(isPresented: isPresented) { visible in
        CenteredStage(visible: visible, dismissible: true, content: content)
      }
    )
  }
}

struct CenteredStage<Content: View>: View {
  let visible: Bool
  let dismissible: Bool
  @ViewBuilder let content: () -> Content

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

  var body: some View {
    ZStack {
      ScrimLayer(visible: visible, dismissible: dismissible)
      content()
        .scaleEffect(visible || reduceMotion ? 1 : 0.95)
        .opacity(visible ? 1 : 0)
        .padding(16)
    }
    .accessibilityAction(.escape) { dismiss?() }
  }
}

extension EnvironmentValues {
  @Entry var overlayCloseInset: CGFloat = 0
}

public struct DialogContent<Content: View>: View {
  let showCloseButton: Bool
  let closeLabel: LocalizedStringKey?
  let content: Content

  public init(
    showCloseButton: Bool = true,
    closeLabel: LocalizedStringKey? = nil,
    @ViewBuilder content: () -> Content
  ) {
    self.showCloseButton = showCloseButton
    self.closeLabel = closeLabel
    self.content = content()
  }

  public var body: some View {
    VStack(alignment: .leading, spacing: 24) {
      content
    }
    .padding(24)
    .frame(maxWidth: 448, alignment: .leading)
    .environment(\.overlayCloseInset, showCloseButton ? (closeLabel == nil ? 32 : 72) : 0)
    .popupSurface(radius: Radius.xl2)
    .overlay(alignment: .topTrailing) {
      if showCloseButton {
        OverlayCloseButton(label: closeLabel)
          .padding(.top, closeLabel == nil ? 19 : 17)
          .padding(.trailing, 16)
      }
    }
    .accessibilityElement(children: .contain)
    .accessibilityAddTraits(.isModal)
  }
}

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

  @Environment(\.overlayCloseInset) private var closeInset

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

  public var body: some View {
    VStack(alignment: .leading, spacing: 6) {
      content
    }
    .padding(.trailing, closeInset)
    .frame(maxWidth: .infinity, alignment: .leading)
  }
}

public struct DialogFooter<Content: View>: View {
  let showCloseButton: Bool
  let content: Content

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

  public var body: some View {
    ReversedVStack(spacing: 8) {
      content
      if showCloseButton {
        DialogClose {
          Text("Close").frame(maxWidth: .infinity)
        }
        .buttonStyle(.variant(.secondary))
      }
    }
  }
}

extension DialogFooter where Content == EmptyView {
  public init(showCloseButton: Bool) {
    self.init(showCloseButton: showCloseButton) { EmptyView() }
  }
}

public struct DialogTitle: View {
  let text: Text

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

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

  public var body: some View {
    text
      .textStyle(.base, weight: .semibold)
      .foregroundStyle(Color.label)
      .fixedSize(horizontal: false, vertical: true)
      .accessibilityAddTraits(.isHeader)
  }
}

public struct DialogDescription: View {
  let text: Text

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

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

  public var body: some View {
    text
      .textStyle(.sm)
      .foregroundStyle(Color.labelSecondary)
      .fixedSize(horizontal: false, vertical: true)
  }
}

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

  @Environment(\.overlayDismiss) private var dismiss

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

  public var body: some View {
    Button {
      action?()
      dismiss?()
    } label: {
      label
    }
  }
}

extension DialogClose where Label == Text {
  public init(_ title: LocalizedStringKey, action: (() -> Void)? = nil) {
    self.init(action: action) { Text(title) }
  }
}
```

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

extension View {
  public func drawer<Content: View>(
    isPresented: Binding<Bool>,
    detents: Set<PresentationDetent>? = nil,
    selection: Binding<PresentationDetent>? = nil,
    onDismiss: (() -> Void)? = nil,
    @ViewBuilder content: @escaping () -> Content
  ) -> some View {
    let binding = isPresented
    return sheet(isPresented: isPresented, onDismiss: onDismiss) {
      DrawerHost(detents: detents, selection: selection, content: content)
        .environment(\.overlayDismiss, OverlayDismiss { binding.wrappedValue = false })
    }
  }
}

extension EnvironmentValues {
  @Entry var drawerFitsContent = false
}

struct DrawerHost<Content: View>: View {
  let detents: Set<PresentationDetent>?
  let selection: Binding<PresentationDetent>?
  @ViewBuilder let content: () -> Content

  @State private var height: CGFloat = 0
  @State private var bottomInset: CGFloat = 0

  var body: some View {
    let styled = content()
      .environment(\.drawerFitsContent, detents == nil)
      .frame(maxWidth: .infinity, maxHeight: detents == nil ? nil : .infinity, alignment: .top)
      .onGeometryChange(for: CGFloat.self) { proxy in
        proxy.size.height
      } action: { value in
        height = value
      }
      .background {
        GeometryReader { proxy in
          Color.clear.onAppear { bottomInset = proxy.safeAreaInsets.bottom }
        }
      }
      .presentationDragIndicator(.visible)
      .presentationBackground(Color.surfaceRaised)
      .presentationCornerRadius(Radius.xl3)
    if let detents, let selection {
      styled.presentationDetents(detents, selection: selection)
    } else if let detents {
      styled.presentationDetents(detents)
    } else {
      styled.presentationDetents([.height(max(height + bottomInset, 1))])
    }
  }
}

public struct DrawerContent<Content: View>: View {
  let showCloseButton: Bool
  let closeLabel: LocalizedStringKey?
  let content: Content

  @Environment(\.drawerFitsContent) private var fitsContent

  public init(
    showCloseButton: Bool = false,
    closeLabel: LocalizedStringKey? = nil,
    @ViewBuilder content: () -> Content
  ) {
    self.showCloseButton = showCloseButton
    self.closeLabel = closeLabel
    self.content = content()
  }

  public var body: some View {
    VStack(alignment: .leading, spacing: 0) {
      content
    }
    .padding(.top, 12)
    .frame(maxWidth: .infinity, maxHeight: fitsContent ? nil : .infinity, alignment: .top)
    .fixedSize(horizontal: false, vertical: fitsContent)
    .environment(\.overlayCloseInset, showCloseButton ? (closeLabel == nil ? 56 : 96) : 0)
    .overlay(alignment: .topTrailing) {
      if showCloseButton {
        OverlayCloseButton(label: closeLabel)
          .padding(.top, closeLabel == nil ? 23 : 21)
          .padding(.trailing, 16)
      }
    }
    .background(Color.surfaceRaised)
  }
}

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

  @Environment(\.overlayCloseInset) private var closeInset

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

  public var body: some View {
    VStack(spacing: 2) {
      content
    }
    .multilineTextAlignment(.center)
    .frame(maxWidth: .infinity)
    .padding(.top, 16)
    .padding(.horizontal, max(closeInset, 16))
  }
}

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

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

  public var body: some View {
    VStack(spacing: 0) {
      Spacer(minLength: 0)
      VStack(spacing: 8) {
        content
      }
      .frame(maxWidth: .infinity)
      .padding([.horizontal, .bottom], 16)
    }
  }
}

public typealias DrawerTitle = DialogTitle
public typealias DrawerDescription = DialogDescription
public typealias DrawerClose<Label: View> = DialogClose<Label>
```

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

public enum KeypadKey: Hashable, Sendable {
  case digit(Int)
  case decimal
  case delete
  case biometric
}

public enum KeypadAccessory {
  case none
  case decimal(String, label: LocalizedStringKey = "Decimal separator")
  case biometric(Image, label: LocalizedStringKey = "Use biometrics")
}

public struct Keypad: View {
  let accessory: KeypadAccessory
  let deleteLabel: LocalizedStringKey
  let canDelete: Bool
  let press: (KeypadKey) -> Bool

  public init(
    accessory: KeypadAccessory = .none,
    deleteLabel: LocalizedStringKey = "Delete",
    deleteDisabled: Bool = false,
    onKeyPress: @escaping (KeypadKey) -> Void
  ) {
    self.accessory = accessory
    self.deleteLabel = deleteLabel
    canDelete = !deleteDisabled
    press = { key in
      onKeyPress(key)
      return true
    }
  }

  init(
    accessory: KeypadAccessory,
    deleteLabel: LocalizedStringKey,
    canDelete: Bool,
    press: @escaping (KeypadKey) -> Bool
  ) {
    self.accessory = accessory
    self.deleteLabel = deleteLabel
    self.canDelete = canDelete
    self.press = press
  }

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

  public var body: some View {
    let size = min(max(72 * scale, 64), 80)
    VStack(spacing: 16) {
      ForEach(0..<3) { row in
        HStack(spacing: 24) {
          ForEach(1..<4) { column in
            digit(row * 3 + column, size: size)
          }
        }
      }
      HStack(spacing: 24) {
        accessoryKey(size: size)
        digit(0, size: size)
        key(.delete, size: size, filled: false) {
          Ph.backspace.regular
            .resizable()
            .frame(width: 28, height: 28)
        }
        .disabled(!canDelete)
        .accessibilityLabel(Text(deleteLabel))
      }
    }
    .accessibilityElement(children: .contain)
  }

  private func digit(_ value: Int, size: CGFloat) -> some View {
    key(.digit(value), size: size, filled: true) {
      Text(verbatim: "\(value)")
        .scaledFont(.xl2)
        .monospacedDigit()
    }
    .accessibilityLabel(Text(verbatim: "\(value)"))
  }

  @ViewBuilder
  private func accessoryKey(size: CGFloat) -> some View {
    switch accessory {
    case .none:
      Color.clear.frame(width: size, height: size)
        .accessibilityHidden(true)
    case .decimal(let separator, let label):
      key(.decimal, size: size, filled: false) {
        Text(verbatim: separator)
          .scaledFont(.xl2)
      }
      .accessibilityLabel(Text(label))
    case .biometric(let icon, let label):
      key(.biometric, size: size, filled: false) {
        icon
          .resizable()
          .frame(width: 28, height: 28)
      }
      .accessibilityLabel(Text(label))
    }
  }

  private func key<Label: View>(
    _ key: KeypadKey,
    size: CGFloat,
    filled: Bool,
    @ViewBuilder label: @escaping () -> Label
  ) -> some View {
    HapticButton(style: PressReader { pressed in
      KeypadFace(pressed: pressed, filled: filled, size: size, label: label)
    }) {
      press(key)
    }
  }
}

private struct KeypadFace<Label: View>: View {
  let pressed: Bool
  let filled: Bool
  let size: CGFloat
  let label: () -> Label

  @Environment(\.isEnabled) private var isEnabled

  var body: some View {
    label()
      .foregroundStyle(isEnabled ? Color.label : .labelQuaternary)
      .frame(width: size, height: size)
      .background(fill, in: Circle())
      .contentShape(Circle())
      .animation(.easeOut(duration: 0.12), value: pressed)
  }

  private var fill: Color {
    if pressed { return .controlPressed }
    if !filled { return .clear }
    return isEnabled ? .control : .controlDisabled
  }
}

private struct ShakeModifier: ViewModifier {
  let trigger: Int

  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  func body(content: Content) -> some View {
    let still = reduceMotion
    content.keyframeAnimator(initialValue: CGFloat(0), trigger: trigger) { view, offset in
      view.offset(x: still ? 0 : offset)
    } keyframes: { _ in
      KeyframeTrack {
        LinearKeyframe(-8, duration: 0.08)
        LinearKeyframe(7, duration: 0.08)
        LinearKeyframe(-5, duration: 0.08)
        LinearKeyframe(3, duration: 0.08)
        LinearKeyframe(0, duration: 0.08, timingCurve: .easeOut)
      }
    }
  }
}

extension View {
  func shake(trigger: Int) -> some View {
    modifier(ShakeModifier(trigger: trigger))
  }
}
```

```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/Popover.swift"
import SwiftUI

public struct PopoverContent<Content: View>: View {
  let width: CGFloat?
  let content: Content

  public init(width: CGFloat? = 288, @ViewBuilder content: () -> Content) {
    self.width = width
    self.content = content()
  }

  public var body: some View {
    VStack(alignment: .leading, spacing: 16) {
      content
    }
    .font(TextStyle.base.font())
    .tracking(TextStyle.base.letterSpacing)
    .foregroundStyle(Color.label)
    .padding(16)
    .frame(width: width, alignment: .leading)
    .fixedSize(horizontal: width == nil, vertical: true)
    .presentationCompactAdaptation(.popover)
    .presentationBackground(Color.surfaceRaised)
  }
}

public struct PopoverHeader<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 typealias PopoverTitle = DialogTitle
public typealias PopoverDescription = DialogDescription
```

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

public struct Separator: View {
  let orientation: Axis

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

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

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

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

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

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

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

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

private struct TextVariantModifier: ViewModifier {
  let variant: TextVariant

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  init() {}

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

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

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

extension View {
  public func preview<Content: View>(
    isPresented: Binding<Bool>,
    arrowEdge: Edge = .top,
    @ViewBuilder content: @escaping () -> Content
  ) -> some View {
    modifier(PreviewPresenter(isPresented: isPresented, arrowEdge: arrowEdge, content: content))
  }
}

struct PreviewPresenter<Body: View>: ViewModifier {
  let isPresented: Binding<Bool>
  let arrowEdge: Edge
  @ViewBuilder let content: () -> Body

  @CompactLayout private var compact

  func body(content host: Content) -> some View {
    let binding = isPresented
    host
      .drawer(isPresented: binding.gated(compact)) {
        content().environment(\.patternCompact, true)
      }
      .popover(isPresented: binding.gated(!compact), arrowEdge: arrowEdge) {
        content()
          .environment(\.patternCompact, false)
          .environment(\.overlayDismiss, OverlayDismiss { binding.wrappedValue = false })
      }
  }
}

public struct PreviewContent<Content: View>: View {
  let showCloseButton: Bool
  let closeLabel: LocalizedStringKey?
  let width: CGFloat?
  let content: Content

  @CompactLayout private var compact

  public init(
    showCloseButton: Bool = false,
    closeLabel: LocalizedStringKey? = nil,
    width: CGFloat? = 256,
    @ViewBuilder content: () -> Content
  ) {
    self.showCloseButton = showCloseButton
    self.closeLabel = closeLabel
    self.width = width
    self.content = content()
  }

  public var body: some View {
    if compact {
      DrawerContent(showCloseButton: showCloseButton, closeLabel: closeLabel) {
        VStack(alignment: .leading, spacing: 16) {
          content
        }
        .frame(maxWidth: .infinity, alignment: .leading)
        .padding(16)
        .padding(.trailing, showCloseButton ? (closeLabel == nil ? 40 : 80) : 0)
      }
    } else {
      PopoverContent(width: width) { content }
    }
  }
}
```

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/components/QrScanner.kt"
package com.esuiss.ui.components

import androidx.compose.animation.animateColorAsState
import androidx.compose.animation.core.Animatable
import androidx.compose.animation.core.CubicBezierEasing
import androidx.compose.animation.core.RepeatMode
import androidx.compose.animation.core.animateFloat
import androidx.compose.animation.core.animateFloatAsState
import androidx.compose.animation.core.infiniteRepeatable
import androidx.compose.animation.core.rememberInfiniteTransition
import androidx.compose.animation.core.spring
import androidx.compose.animation.core.tween
import androidx.compose.foundation.Canvas
import androidx.compose.foundation.background
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsPressedAsState
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.BoxScope
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.selection.toggleable
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
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.alpha
import androidx.compose.ui.draw.clip
import androidx.compose.ui.draw.clipToBounds
import androidx.compose.ui.geometry.CornerRadius
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Rect
import androidx.compose.ui.geometry.RoundRect
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Path
import androidx.compose.ui.graphics.PathFillType
import androidx.compose.ui.graphics.StrokeCap
import androidx.compose.ui.graphics.StrokeJoin
import androidx.compose.ui.graphics.drawscope.Stroke
import androidx.compose.ui.graphics.drawscope.scale
import androidx.compose.ui.hapticfeedback.HapticFeedbackType
import androidx.compose.ui.layout.Layout
import androidx.compose.ui.semantics.Role
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.text.style.TextAlign
import androidx.compose.ui.unit.Density
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Fill
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.fill.Flashlight
import com.adamglin.phosphoricons.regular.Flashlight
import com.esuiss.ui.theme.DarkColors
import com.esuiss.ui.theme.Typography
import kotlin.math.max
import kotlin.math.min
import kotlin.math.roundToInt

enum class QrScannerState { Idle, Success, Error }

private val QrFrameMax = 260.dp
private const val QrFrameRatio = 0.66f
private val QrFrameLift = 24.dp
private val QrHoleRadius = 32.dp
private val QrBracketArm = 48.dp
private val QrBracketWidth = 6.dp
private val QrLineInset = 24.dp
private val QrLineHeight = 2.dp
private val QrTitleGap = 32.dp
private val QrTitleInset = 24.dp
private val QrDescriptionGap = 20.dp
private val QrDescriptionWidth = 280.dp
private val QrTorchBottom = 48.dp
private val QrTorchSize = 56.dp
private val QrScanEasing = CubicBezierEasing(0.42f, 0f, 0.58f, 1f)

private fun Density.qrFrame(frameSize: Dp?, width: Float, height: Float): Rect {
    val side = frameSize?.toPx()
        ?: min(QrFrameMax.toPx(), (min(width, height) / density * QrFrameRatio).roundToInt() * density)
    val left = (width - side) / 2
    val top = max(0f, (height - side) / 2 - QrFrameLift.toPx())
    return Rect(left, top, left + side, top + side)
}

@Composable
fun QrScanner(
    modifier: Modifier = Modifier,
    state: QrScannerState = QrScannerState.Idle,
    title: String? = null,
    hint: String? = null,
    scanLine: Boolean = false,
    torch: Boolean = false,
    onTorchToggle: ((Boolean) -> Unit)? = null,
    frameSize: Dp? = null,
    content: @Composable BoxScope.() -> Unit = {},
) {
    val colors = DarkColors
    val haptics = rememberHaptics()
    val reduced = formReducedMotion()
    val shake = remember { Animatable(0f) }
    LaunchedEffect(state) {
        when (state) {
            QrScannerState.Success -> haptics.perform(HapticFeedbackType.Confirm)
            QrScannerState.Error -> {
                haptics.perform(HapticFeedbackType.Reject)
                if (!reduced) shake.shake()
            }
            QrScannerState.Idle -> Unit
        }
    }
    val bracket by animateColorAsState(
        when (state) {
            QrScannerState.Idle -> colors.onMedia
            QrScannerState.Success -> colors.success
            QrScannerState.Error -> colors.danger
        },
        tween(200),
        label = "bracket",
    )
    val scale by animateFloatAsState(
        if (state == QrScannerState.Success && !reduced) 0.94f else 1f,
        spring(dampingRatio = 0.6f, stiffness = 400f),
        label = "scale",
    )
    val scanning = scanLine && state == QrScannerState.Idle && !reduced
    val sweep = rememberInfiniteTransition(label = "scan")
    val position by sweep.animateFloat(
        0f,
        1f,
        infiniteRepeatable(tween(1800, easing = QrScanEasing), RepeatMode.Reverse),
        label = "line",
    )
    val stateText = when (state) {
        QrScannerState.Idle -> "Scanning"
        QrScannerState.Success -> "Code found"
        QrScannerState.Error -> "Code not recognized"
    }
    Box(modifier = modifier.fillMaxSize().clipToBounds()) {
        content()
        Canvas(
            modifier = Modifier
                .matchParentSize()
                .semantics {
                    contentDescription = "Scan area"
                    stateDescription = stateText
                },
        ) {
            val base = qrFrame(frameSize, size.width, size.height)
            val frame = base.translate(shake.value * density, 0f)
            val side = frame.width
            val radius = min(QrHoleRadius.toPx(), side / 2)
            val cutout = Path().apply {
                fillType = PathFillType.EvenOdd
                addRect(Rect(Offset.Zero, size))
                addRoundRect(RoundRect(frame, CornerRadius(radius)))
            }
            drawPath(cutout, colors.scrim)
            val arm = max(radius, min(QrBracketArm.toPx(), side / 2))
            val stroke = Stroke(QrBracketWidth.toPx(), cap = StrokeCap.Round, join = StrokeJoin.Round)
            val corners = listOf(
                Triple(Offset(frame.left, frame.top), 1f, 1f),
                Triple(Offset(frame.right, frame.top), -1f, 1f),
                Triple(Offset(frame.right, frame.bottom), -1f, -1f),
                Triple(Offset(frame.left, frame.bottom), 1f, -1f),
            )
            scale(scale, frame.center) {
                corners.forEach { (corner, dx, dy) ->
                    val center = Offset(corner.x + dx * radius, corner.y + dy * radius)
                    val path = Path().apply {
                        moveTo(corner.x, corner.y + dy * arm)
                        lineTo(corner.x, corner.y + dy * radius)
                        arcTo(
                            Rect(center, radius),
                            if (dx > 0) 180f else 0f,
                            if (dx * dy > 0) 90f else -90f,
                            false,
                        )
                        lineTo(corner.x + dx * arm, corner.y)
                    }
                    drawPath(path, bracket, style = stroke)
                }
            }
            if (scanning) {
                val inset = QrLineInset.toPx()
                val height = QrLineHeight.toPx()
                val y = frame.top + inset + (side - inset * 2) * position
                drawRoundRect(
                    colors.accent,
                    topLeft = Offset(frame.left + inset, y - height / 2),
                    size = Size(side - inset * 2, height),
                    cornerRadius = CornerRadius(height / 2),
                )
            }
        }
        Layout(
            modifier = Modifier.matchParentSize(),
            content = {
                if (title != null) {
                    BasicText(
                        title,
                        style = Typography.lg.copy(color = colors.onMedia, fontWeight = FontWeight.SemiBold, textAlign = TextAlign.Center),
                    )
                } else {
                    Box(Modifier)
                }
                if (hint != null) {
                    BasicText(
                        hint,
                        modifier = Modifier.widthIn(max = QrDescriptionWidth),
                        style = Typography.sm.copy(color = colors.onMedia, textAlign = TextAlign.Center),
                    )
                } else {
                    Box(Modifier)
                }
                if (onTorchToggle != null) {
                    QrScannerTorch(torch, onTorchToggle)
                } else {
                    Box(Modifier)
                }
            },
        ) { measurables, constraints ->
            val loose = constraints.copy(minWidth = 0, minHeight = 0)
            val width = constraints.maxWidth
            val height = constraints.maxHeight
            val inset = QrTitleInset.roundToPx()
            val titlePlaceable = measurables[0].measure(loose.copy(maxWidth = max(0, width - inset * 2)))
            val hintPlaceable = measurables[1].measure(loose)
            val torchPlaceable = measurables[2].measure(loose)
            val frame = qrFrame(frameSize, width.toFloat(), height.toFloat())
            val top = frame.top.roundToInt()
            val bottom = frame.bottom.roundToInt()
            layout(width, height) {
                titlePlaceable.place((width - titlePlaceable.width) / 2, top - QrTitleGap.roundToPx() - titlePlaceable.height)
                hintPlaceable.place((width - hintPlaceable.width) / 2, bottom + QrDescriptionGap.roundToPx())
                torchPlaceable.place((width - torchPlaceable.width) / 2, height - QrTorchBottom.roundToPx() - torchPlaceable.height)
            }
        }
    }
}

@Composable
private fun QrScannerTorch(on: Boolean, onToggle: (Boolean) -> Unit) {
    val colors = DarkColors
    val source = remember { MutableInteractionSource() }
    val pressed by source.collectIsPressedAsState()
    val haptics = rememberHaptics()
    Box(
        modifier = Modifier
            .size(QrTorchSize)
            .alpha(if (pressed) 0.7f else 1f)
            .clip(CircleShape)
            .background(if (on) colors.onMedia else colors.scrim, CircleShape)
            .toggleable(on, source, null, true, Role.Switch) {
                haptics.toggle(it)
                onToggle(it)
            }
            .semantics { contentDescription = "Torch" },
        contentAlignment = Alignment.Center,
    ) {
        Icon(
            if (on) PhosphorIcons.Fill.Flashlight else PhosphorIcons.Regular.Flashlight,
            contentDescription = null,
            size = 24.dp,
            tint = if (on) colors.media else colors.onMedia,
        )
    }
}
```

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

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

enum class FieldOrientation { Vertical, Horizontal, Responsive }

enum class FieldGroupVariant { Default, Inset }

enum class FieldLegendVariant { Legend, Label }

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

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

private val LocalFieldSetInset = staticCompositionLocalOf { false }

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

private val LocalFieldInset = staticCompositionLocalOf { false }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

val LocalHapticsEnabled = staticCompositionLocalOf { true }

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

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

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

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

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

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

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

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

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

import androidx.compose.animation.core.Animatable
import androidx.compose.animation.core.AnimationVector1D
import androidx.compose.animation.core.keyframes
import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsPressedAsState
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
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.getValue
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.vector.ImageVector
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.Backspace
import com.adamglin.phosphoricons.regular.Fingerprint
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography

private val KeypadKeySize = 72.dp

private val KeypadColumnGap = 24.dp

private val KeypadRowGap = 16.dp

private val KeypadRows = listOf(listOf(1, 2, 3), listOf(4, 5, 6), listOf(7, 8, 9))

sealed interface KeypadKey {
    data class Digit(val value: Int) : KeypadKey

    data object Decimal : KeypadKey

    data object Biometric : KeypadKey

    data object Delete : KeypadKey
}

sealed interface KeypadAccessory {
    data object None : KeypadAccessory

    data class Decimal(
        val separator: String = ".",
        val label: String = "Decimal separator",
    ) : KeypadAccessory

    data class Biometric(
        val icon: ImageVector = PhosphorIcons.Regular.Fingerprint,
        val label: String = "Use biometrics",
    ) : KeypadAccessory
}

@Composable
fun Keypad(
    onKeyPress: (KeypadKey) -> Unit,
    modifier: Modifier = Modifier,
    accessory: KeypadAccessory = KeypadAccessory.None,
    deleteLabel: String = "Delete",
    enabled: Boolean = true,
) {
    Column(
        modifier = modifier,
        verticalArrangement = Arrangement.spacedBy(KeypadRowGap),
        horizontalAlignment = Alignment.CenterHorizontally,
    ) {
        KeypadRows.forEach { row ->
            Row(horizontalArrangement = Arrangement.spacedBy(KeypadColumnGap)) {
                row.forEach { digit -> KeypadDigit(digit, enabled, onKeyPress) }
            }
        }
        Row(horizontalArrangement = Arrangement.spacedBy(KeypadColumnGap)) {
            when (accessory) {
                KeypadAccessory.None -> Box(Modifier.size(KeypadKeySize))
                is KeypadAccessory.Decimal -> KeypadButton(
                    onClick = { onKeyPress(KeypadKey.Decimal) },
                    enabled = enabled,
                    filled = true,
                    contentDescription = accessory.label,
                ) {
                    KeypadText(accessory.separator)
                }
                is KeypadAccessory.Biometric -> KeypadButton(
                    onClick = { onKeyPress(KeypadKey.Biometric) },
                    enabled = enabled,
                    filled = false,
                    contentDescription = accessory.label,
                ) {
                    Icon(accessory.icon, contentDescription = null, size = 32.dp)
                }
            }
            KeypadDigit(0, enabled, onKeyPress)
            KeypadButton(
                onClick = { onKeyPress(KeypadKey.Delete) },
                enabled = enabled,
                filled = false,
                contentDescription = deleteLabel,
            ) {
                Icon(PhosphorIcons.Regular.Backspace, contentDescription = null, size = 28.dp)
            }
        }
    }
}

@Composable
private fun KeypadDigit(digit: Int, enabled: Boolean, onKeyPress: (KeypadKey) -> Unit) {
    KeypadButton(onClick = { onKeyPress(KeypadKey.Digit(digit)) }, enabled = enabled, filled = true) {
        KeypadText(digit.toString())
    }
}

@Composable
private fun KeypadText(text: String) {
    BasicText(
        text,
        style = Typography.xl2.copy(
            color = LocalContentColor.current,
            fontWeight = FontWeight.Medium,
            fontFeatureSettings = "tnum",
        ),
    )
}

@Composable
private fun KeypadButton(
    onClick: () -> Unit,
    enabled: Boolean,
    filled: Boolean,
    contentDescription: String? = null,
    content: @Composable () -> Unit,
) {
    val colors = EsuissTheme.colors
    val interaction = remember { MutableInteractionSource() }
    val pressed by interaction.collectIsPressedAsState()
    val haptics = rememberHaptics()
    val background = when {
        !enabled -> if (filled) colors.controlDisabled else Color.Transparent
        pressed -> colors.controlPressed
        filled -> colors.control
        else -> Color.Transparent
    }
    val foreground = if (enabled) colors.label else colors.labelQuaternary
    Box(
        modifier = Modifier
            .size(KeypadKeySize)
            .clip(CircleShape)
            .background(background, CircleShape)
            .clickable(
                interactionSource = interaction,
                indication = null,
                enabled = enabled,
                role = Role.Button,
            ) {
                haptics.selection()
                onClick()
            }
            .then(
                if (contentDescription != null) {
                    Modifier.semantics { this.contentDescription = contentDescription }
                } else {
                    Modifier
                },
            ),
        contentAlignment = Alignment.Center,
    ) {
        CompositionLocalProvider(LocalContentColor provides foreground) {
            content()
        }
    }
}

internal suspend fun Animatable<Float, AnimationVector1D>.shake() {
    snapTo(0f)
    animateTo(
        0f,
        keyframes {
            durationMillis = 400
            -8f at 60
            7f at 140
            -5f at 220
            3f at 300
            0f at 400
        },
    )
}
```

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

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

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

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

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

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

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

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

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

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

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

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

## Usage

```tsx
import { QRScanner } from "@/components/ui/qr-scanner"
```

```tsx
<Scanner description="Point your camera at a code to pay or connect." />
```

Render your camera view as `children` and size the scanner with `className`. When there are no children, the background falls back to `bg-media`.

Set `state` to `success` or `error` after you read a code. The brackets fade to a matching color, `success` springs the frame slightly smaller and `error` shakes it. Pass `onTorchToggle` together with a controlled `torch` value to show the flashlight button; leave it out to hide the button. `title` and `description` accept strings or your own elements.

The `QRScannerState` type is also exported.

## Examples

### Success

The `success` state with green brackets and a slightly smaller frame.

![Preview](https://uim.suiss.app/previews/components-qr-scanner--success.light.webp)

```tsx
import { IconProps as PhosphorIconProps } from "phosphor-react-native"
import * as React from "react"
import { View } from "react-native"
import { Path } from "react-native-svg"
import Svg from "react-native-svg"
import { Icon } from "@/components/ui/icon"
import { QRScanner, type QRScannerState } from "@/components/ui/qr-scanner"

const MODULES = 21

const MODULE_SIZE = 6

const CODE_SIZE = MODULES * MODULE_SIZE

const FINDERS = [
  [0, 0],
  [0, 14],
  [14, 0],
]

function isDark(row: number, column: number) {
  for (const [top, left] of FINDERS) {
    const i = row - top
    const j = column - left
    if (i >= 0 && i <= 6 && j >= 0 && j <= 6) {
      return (
        i === 0 ||
        i === 6 ||
        j === 0 ||
        j === 6 ||
        (i >= 2 && i <= 4 && j >= 2 && j <= 4)
      )
    }
    const boxTop = top === 0 ? 0 : top - 1
    const boxLeft = left === 0 ? 0 : left - 1
    if (
      row >= boxTop &&
      row <= boxTop + 7 &&
      column >= boxLeft &&
      column <= boxLeft + 7
    ) {
      return false
    }
  }
  return (row * 7 + column * 11 + row * column) % 5 < 2
}

const CODE_PATH = Array.from({ length: MODULES * MODULES }, (_, index) => {
  const row = Math.floor(index / MODULES)
  const column = index % MODULES
  return isDark(row, column)
    ? `M${column * MODULE_SIZE} ${row * MODULE_SIZE}h${MODULE_SIZE}v${MODULE_SIZE}h-${MODULE_SIZE}Z`
    : ""
}).join("")

function QRCode({ color }: PhosphorIconProps) {
  return (
    <Svg width={CODE_SIZE} height={CODE_SIZE}>
      <Path d={CODE_PATH} fill={color} />
    </Svg>
  )
}

function CameraPlaceholder() {
  return (
    <View className="flex-1 items-center justify-center bg-media">
      <View className="mb-12 -rotate-6 rounded-xl bg-on-media p-2.5">
        <Icon as={QRCode} className="text-media" />
      </View>
    </View>
  )
}

function Scanner({
  state,
  description,
  scanLine,
}: {
  state?: QRScannerState
  description?: string
  scanLine?: boolean
}) {
  const [torch, setTorch] = React.useState(false)
  return (
    <QRScanner
      className="flex-1"
      state={state}
      scanLine={scanLine}
      title="Scan QR code"
      description={description}
      torch={torch}
      onTorchToggle={setTorch}
    >
      <CameraPlaceholder />
    </QRScanner>
  )
}

export function QrScannerSuccessExample() {
  return (
    <Scanner state="success" description="Code recognised" />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct QRScannerSuccessExample: View {
  var body: some View {
    QRScannerDemo(state: .success, hint: "Code recognised")
  }
}

struct QRScannerDemo: View {
  var state: QRScannerState = .idle
  let hint: LocalizedStringKey
  var scanLine = false

  @State private var torch = false

  var body: some View {
    QRScanner(
      state: state,
      title: "Scan QR code",
      hint: hint,
      scanLine: scanLine,
      isTorchOn: torch,
      onTorchToggle: { torch.toggle() }
    ) {
      QRScannerCameraPlaceholder()
    }
    .ignoresSafeArea()
  }
}

enum QRCodeSample {
  static let count = 21
  static let module: CGFloat = 6
  static let padding: CGFloat = 10
  static let side = CGFloat(count) * module + padding * 2

  static func isDark(_ r: Int, _ c: Int) -> Bool {
    for (fr, fc) in [(0, 0), (0, 14), (14, 0)] {
      let i = r - fr
      let j = c - fc
      if (0...6).contains(i) && (0...6).contains(j) {
        return i == 0 || i == 6 || j == 0 || j == 6 || ((2...4).contains(i) && (2...4).contains(j))
      }
    }
    if r <= 7 && c <= 7 { return false }
    if r <= 7 && c >= 13 { return false }
    if r >= 13 && c <= 7 { return false }
    return (r * 7 + c * 11 + r * c) % 5 < 2
  }

  static let modules: Path = {
    var path = Path()
    for r in 0..<count {
      for c in 0..<count where isDark(r, c) {
        path.addRect(CGRect(x: padding + CGFloat(c) * module, y: padding + CGFloat(r) * module, width: module, height: module))
      }
    }
    return path
  }()
}

struct QRScannerCameraPlaceholder: View {
  var body: some View {
    GeometryReader { proxy in
      Canvas { context, _ in
        let card = CGRect(origin: .zero, size: CGSize(width: QRCodeSample.side, height: QRCodeSample.side))
        context.fill(Path(roundedRect: card, cornerRadius: Radius.xl, style: .continuous), with: .color(.onMedia))
        context.fill(QRCodeSample.modules, with: .color(.media))
      }
      .frame(width: QRCodeSample.side, height: QRCodeSample.side)
      .rotationEffect(.degrees(-6))
      .position(x: proxy.size.width / 2, y: proxy.size.height / 2 - 24)
    }
    .background(Color.media)
    .accessibilityHidden(true)
  }
}

let count = 21

let module: CGFloat = 6

let padding: CGFloat = 10

let side = CGFloat(count) * module + padding * 2

func isDark(_ r: Int, _ c: Int) -> Bool {
  for (fr, fc) in [(0, 0), (0, 14), (14, 0)] {
    let i = r - fr
    let j = c - fc
    if (0...6).contains(i) && (0...6).contains(j) {
      return i == 0 || i == 6 || j == 0 || j == 6 || ((2...4).contains(i) && (2...4).contains(j))
    }
  }
  if r <= 7 && c <= 7 { return false }
  if r <= 7 && c >= 13 { return false }
  if r >= 13 && c <= 7 { return false }
  return (r * 7 + c * 11 + r * c) % 5 < 2
}

let modules: Path = {
  var path = Path()
  for r in 0..<count {
    for c in 0..<count where isDark(r, c) {
      path.addRect(CGRect(x: padding + CGFloat(c) * module, y: padding + CGFloat(r) * module, width: module, height: module))
    }
  }
  return path
}
```

```kotlin
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import com.esuiss.ui.components.QrScanner
import com.esuiss.ui.components.QrScannerState

@Composable
fun QRScannerSuccessExample() {
    QrScannerDemo(state = QrScannerState.Success, hint = "Code recognised")
}

@Composable
fun QrScannerDemo(
    state: QrScannerState = QrScannerState.Idle,
    hint: String? = null,
    scanLine: Boolean = false,
) {
    var torch by rememberSaveable { mutableStateOf(false) }
    QrScanner(
        modifier = Modifier.fillMaxSize(),
        state = state,
        title = "Scan QR code",
        hint = hint,
        scanLine = scanLine,
        torch = torch,
        onTorchToggle = { torch = it },
    ) {
        QrScannerCameraPlaceholder()
    }
}
```

### Error

The `error` state, which shakes the frame and turns the brackets red.

![Preview](https://uim.suiss.app/previews/components-qr-scanner--error-state.light.webp)

```tsx
import { IconProps as PhosphorIconProps } from "phosphor-react-native"
import * as React from "react"
import { View } from "react-native"
import { Path } from "react-native-svg"
import Svg from "react-native-svg"
import { Icon } from "@/components/ui/icon"
import { QRScanner, type QRScannerState } from "@/components/ui/qr-scanner"

const MODULES = 21

const MODULE_SIZE = 6

const CODE_SIZE = MODULES * MODULE_SIZE

const FINDERS = [
  [0, 0],
  [0, 14],
  [14, 0],
]

function isDark(row: number, column: number) {
  for (const [top, left] of FINDERS) {
    const i = row - top
    const j = column - left
    if (i >= 0 && i <= 6 && j >= 0 && j <= 6) {
      return (
        i === 0 ||
        i === 6 ||
        j === 0 ||
        j === 6 ||
        (i >= 2 && i <= 4 && j >= 2 && j <= 4)
      )
    }
    const boxTop = top === 0 ? 0 : top - 1
    const boxLeft = left === 0 ? 0 : left - 1
    if (
      row >= boxTop &&
      row <= boxTop + 7 &&
      column >= boxLeft &&
      column <= boxLeft + 7
    ) {
      return false
    }
  }
  return (row * 7 + column * 11 + row * column) % 5 < 2
}

const CODE_PATH = Array.from({ length: MODULES * MODULES }, (_, index) => {
  const row = Math.floor(index / MODULES)
  const column = index % MODULES
  return isDark(row, column)
    ? `M${column * MODULE_SIZE} ${row * MODULE_SIZE}h${MODULE_SIZE}v${MODULE_SIZE}h-${MODULE_SIZE}Z`
    : ""
}).join("")

function QRCode({ color }: PhosphorIconProps) {
  return (
    <Svg width={CODE_SIZE} height={CODE_SIZE}>
      <Path d={CODE_PATH} fill={color} />
    </Svg>
  )
}

function CameraPlaceholder() {
  return (
    <View className="flex-1 items-center justify-center bg-media">
      <View className="mb-12 -rotate-6 rounded-xl bg-on-media p-2.5">
        <Icon as={QRCode} className="text-media" />
      </View>
    </View>
  )
}

function Scanner({
  state,
  description,
  scanLine,
}: {
  state?: QRScannerState
  description?: string
  scanLine?: boolean
}) {
  const [torch, setTorch] = React.useState(false)
  return (
    <QRScanner
      className="flex-1"
      state={state}
      scanLine={scanLine}
      title="Scan QR code"
      description={description}
      torch={torch}
      onTorchToggle={setTorch}
    >
      <CameraPlaceholder />
    </QRScanner>
  )
}

export function QrScannerErrorStateExample() {
  return (
    <Scanner state="error" description="This code is not supported." />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct QRScannerErrorStateExample: View {
  var body: some View {
    QRScannerDemo(state: .error, hint: "This code is not supported.")
  }
}

struct QRScannerDemo: View {
  var state: QRScannerState = .idle
  let hint: LocalizedStringKey
  var scanLine = false

  @State private var torch = false

  var body: some View {
    QRScanner(
      state: state,
      title: "Scan QR code",
      hint: hint,
      scanLine: scanLine,
      isTorchOn: torch,
      onTorchToggle: { torch.toggle() }
    ) {
      QRScannerCameraPlaceholder()
    }
    .ignoresSafeArea()
  }
}

enum QRCodeSample {
  static let count = 21
  static let module: CGFloat = 6
  static let padding: CGFloat = 10
  static let side = CGFloat(count) * module + padding * 2

  static func isDark(_ r: Int, _ c: Int) -> Bool {
    for (fr, fc) in [(0, 0), (0, 14), (14, 0)] {
      let i = r - fr
      let j = c - fc
      if (0...6).contains(i) && (0...6).contains(j) {
        return i == 0 || i == 6 || j == 0 || j == 6 || ((2...4).contains(i) && (2...4).contains(j))
      }
    }
    if r <= 7 && c <= 7 { return false }
    if r <= 7 && c >= 13 { return false }
    if r >= 13 && c <= 7 { return false }
    return (r * 7 + c * 11 + r * c) % 5 < 2
  }

  static let modules: Path = {
    var path = Path()
    for r in 0..<count {
      for c in 0..<count where isDark(r, c) {
        path.addRect(CGRect(x: padding + CGFloat(c) * module, y: padding + CGFloat(r) * module, width: module, height: module))
      }
    }
    return path
  }()
}

struct QRScannerCameraPlaceholder: View {
  var body: some View {
    GeometryReader { proxy in
      Canvas { context, _ in
        let card = CGRect(origin: .zero, size: CGSize(width: QRCodeSample.side, height: QRCodeSample.side))
        context.fill(Path(roundedRect: card, cornerRadius: Radius.xl, style: .continuous), with: .color(.onMedia))
        context.fill(QRCodeSample.modules, with: .color(.media))
      }
      .frame(width: QRCodeSample.side, height: QRCodeSample.side)
      .rotationEffect(.degrees(-6))
      .position(x: proxy.size.width / 2, y: proxy.size.height / 2 - 24)
    }
    .background(Color.media)
    .accessibilityHidden(true)
  }
}

let count = 21

let module: CGFloat = 6

let padding: CGFloat = 10

let side = CGFloat(count) * module + padding * 2

func isDark(_ r: Int, _ c: Int) -> Bool {
  for (fr, fc) in [(0, 0), (0, 14), (14, 0)] {
    let i = r - fr
    let j = c - fc
    if (0...6).contains(i) && (0...6).contains(j) {
      return i == 0 || i == 6 || j == 0 || j == 6 || ((2...4).contains(i) && (2...4).contains(j))
    }
  }
  if r <= 7 && c <= 7 { return false }
  if r <= 7 && c >= 13 { return false }
  if r >= 13 && c <= 7 { return false }
  return (r * 7 + c * 11 + r * c) % 5 < 2
}

let modules: Path = {
  var path = Path()
  for r in 0..<count {
    for c in 0..<count where isDark(r, c) {
      path.addRect(CGRect(x: padding + CGFloat(c) * module, y: padding + CGFloat(r) * module, width: module, height: module))
    }
  }
  return path
}
```

```kotlin
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import com.esuiss.ui.components.QrScanner
import com.esuiss.ui.components.QrScannerState

@Composable
fun QRScannerErrorStateExample() {
    QrScannerDemo(state = QrScannerState.Error, hint = "This code is not supported.")
}

@Composable
fun QrScannerDemo(
    state: QrScannerState = QrScannerState.Idle,
    hint: String? = null,
    scanLine: Boolean = false,
) {
    var torch by rememberSaveable { mutableStateOf(false) }
    QrScanner(
        modifier = Modifier.fillMaxSize(),
        state = state,
        title = "Scan QR code",
        hint = hint,
        scanLine = scanLine,
        torch = torch,
        onTorchToggle = { torch = it },
    ) {
        QrScannerCameraPlaceholder()
    }
}
```

### With scan line

The scanner with `scanLine` turned on.

![Preview](https://uim.suiss.app/previews/components-qr-scanner--with-scan-line.light.webp)

```tsx
import { IconProps as PhosphorIconProps } from "phosphor-react-native"
import * as React from "react"
import { View } from "react-native"
import { Path } from "react-native-svg"
import Svg from "react-native-svg"
import { Icon } from "@/components/ui/icon"
import { QRScanner, type QRScannerState } from "@/components/ui/qr-scanner"

const MODULES = 21

const MODULE_SIZE = 6

const CODE_SIZE = MODULES * MODULE_SIZE

const FINDERS = [
  [0, 0],
  [0, 14],
  [14, 0],
]

function isDark(row: number, column: number) {
  for (const [top, left] of FINDERS) {
    const i = row - top
    const j = column - left
    if (i >= 0 && i <= 6 && j >= 0 && j <= 6) {
      return (
        i === 0 ||
        i === 6 ||
        j === 0 ||
        j === 6 ||
        (i >= 2 && i <= 4 && j >= 2 && j <= 4)
      )
    }
    const boxTop = top === 0 ? 0 : top - 1
    const boxLeft = left === 0 ? 0 : left - 1
    if (
      row >= boxTop &&
      row <= boxTop + 7 &&
      column >= boxLeft &&
      column <= boxLeft + 7
    ) {
      return false
    }
  }
  return (row * 7 + column * 11 + row * column) % 5 < 2
}

const CODE_PATH = Array.from({ length: MODULES * MODULES }, (_, index) => {
  const row = Math.floor(index / MODULES)
  const column = index % MODULES
  return isDark(row, column)
    ? `M${column * MODULE_SIZE} ${row * MODULE_SIZE}h${MODULE_SIZE}v${MODULE_SIZE}h-${MODULE_SIZE}Z`
    : ""
}).join("")

function QRCode({ color }: PhosphorIconProps) {
  return (
    <Svg width={CODE_SIZE} height={CODE_SIZE}>
      <Path d={CODE_PATH} fill={color} />
    </Svg>
  )
}

function CameraPlaceholder() {
  return (
    <View className="flex-1 items-center justify-center bg-media">
      <View className="mb-12 -rotate-6 rounded-xl bg-on-media p-2.5">
        <Icon as={QRCode} className="text-media" />
      </View>
    </View>
  )
}

function Scanner({
  state,
  description,
  scanLine,
}: {
  state?: QRScannerState
  description?: string
  scanLine?: boolean
}) {
  const [torch, setTorch] = React.useState(false)
  return (
    <QRScanner
      className="flex-1"
      state={state}
      scanLine={scanLine}
      title="Scan QR code"
      description={description}
      torch={torch}
      onTorchToggle={setTorch}
    >
      <CameraPlaceholder />
    </QRScanner>
  )
}

export function QrScannerWithScanLineExample() {
  return (
    <Scanner scanLine description="Hold steady over the code." />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct QRScannerWithScanLineExample: View {
  var body: some View {
    QRScannerDemo(hint: "Hold steady over the code.", scanLine: true)
  }
}

struct QRScannerDemo: View {
  var state: QRScannerState = .idle
  let hint: LocalizedStringKey
  var scanLine = false

  @State private var torch = false

  var body: some View {
    QRScanner(
      state: state,
      title: "Scan QR code",
      hint: hint,
      scanLine: scanLine,
      isTorchOn: torch,
      onTorchToggle: { torch.toggle() }
    ) {
      QRScannerCameraPlaceholder()
    }
    .ignoresSafeArea()
  }
}

enum QRCodeSample {
  static let count = 21
  static let module: CGFloat = 6
  static let padding: CGFloat = 10
  static let side = CGFloat(count) * module + padding * 2

  static func isDark(_ r: Int, _ c: Int) -> Bool {
    for (fr, fc) in [(0, 0), (0, 14), (14, 0)] {
      let i = r - fr
      let j = c - fc
      if (0...6).contains(i) && (0...6).contains(j) {
        return i == 0 || i == 6 || j == 0 || j == 6 || ((2...4).contains(i) && (2...4).contains(j))
      }
    }
    if r <= 7 && c <= 7 { return false }
    if r <= 7 && c >= 13 { return false }
    if r >= 13 && c <= 7 { return false }
    return (r * 7 + c * 11 + r * c) % 5 < 2
  }

  static let modules: Path = {
    var path = Path()
    for r in 0..<count {
      for c in 0..<count where isDark(r, c) {
        path.addRect(CGRect(x: padding + CGFloat(c) * module, y: padding + CGFloat(r) * module, width: module, height: module))
      }
    }
    return path
  }()
}

struct QRScannerCameraPlaceholder: View {
  var body: some View {
    GeometryReader { proxy in
      Canvas { context, _ in
        let card = CGRect(origin: .zero, size: CGSize(width: QRCodeSample.side, height: QRCodeSample.side))
        context.fill(Path(roundedRect: card, cornerRadius: Radius.xl, style: .continuous), with: .color(.onMedia))
        context.fill(QRCodeSample.modules, with: .color(.media))
      }
      .frame(width: QRCodeSample.side, height: QRCodeSample.side)
      .rotationEffect(.degrees(-6))
      .position(x: proxy.size.width / 2, y: proxy.size.height / 2 - 24)
    }
    .background(Color.media)
    .accessibilityHidden(true)
  }
}

let count = 21

let module: CGFloat = 6

let padding: CGFloat = 10

let side = CGFloat(count) * module + padding * 2

func isDark(_ r: Int, _ c: Int) -> Bool {
  for (fr, fc) in [(0, 0), (0, 14), (14, 0)] {
    let i = r - fr
    let j = c - fc
    if (0...6).contains(i) && (0...6).contains(j) {
      return i == 0 || i == 6 || j == 0 || j == 6 || ((2...4).contains(i) && (2...4).contains(j))
    }
  }
  if r <= 7 && c <= 7 { return false }
  if r <= 7 && c >= 13 { return false }
  if r >= 13 && c <= 7 { return false }
  return (r * 7 + c * 11 + r * c) % 5 < 2
}

let modules: Path = {
  var path = Path()
  for r in 0..<count {
    for c in 0..<count where isDark(r, c) {
      path.addRect(CGRect(x: padding + CGFloat(c) * module, y: padding + CGFloat(r) * module, width: module, height: module))
    }
  }
  return path
}
```

```kotlin
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import com.esuiss.ui.components.QrScanner
import com.esuiss.ui.components.QrScannerState

@Composable
fun QRScannerWithScanLineExample() {
    QrScannerDemo(scanLine = true, hint = "Hold steady over the code.")
}

@Composable
fun QrScannerDemo(
    state: QrScannerState = QrScannerState.Idle,
    hint: String? = null,
    scanLine: Boolean = false,
) {
    var torch by rememberSaveable { mutableStateOf(false) }
    QrScanner(
        modifier = Modifier.fillMaxSize(),
        state = state,
        title = "Scan QR code",
        hint = hint,
        scanLine = scanLine,
        torch = torch,
        onTorchToggle = { torch = it },
    ) {
        QrScannerCameraPlaceholder()
    }
}
```

### Without torch

A title and description with no flashlight button, because `onTorchToggle` is not passed.

![Preview](https://uim.suiss.app/previews/components-qr-scanner--without-torch.light.webp)

```tsx
import { IconProps as PhosphorIconProps } from "phosphor-react-native"
import { View } from "react-native"
import { Path } from "react-native-svg"
import Svg from "react-native-svg"
import { Icon } from "@/components/ui/icon"
import { QRScanner } from "@/components/ui/qr-scanner"

const MODULES = 21

const MODULE_SIZE = 6

const CODE_SIZE = MODULES * MODULE_SIZE

const FINDERS = [
  [0, 0],
  [0, 14],
  [14, 0],
]

function isDark(row: number, column: number) {
  for (const [top, left] of FINDERS) {
    const i = row - top
    const j = column - left
    if (i >= 0 && i <= 6 && j >= 0 && j <= 6) {
      return (
        i === 0 ||
        i === 6 ||
        j === 0 ||
        j === 6 ||
        (i >= 2 && i <= 4 && j >= 2 && j <= 4)
      )
    }
    const boxTop = top === 0 ? 0 : top - 1
    const boxLeft = left === 0 ? 0 : left - 1
    if (
      row >= boxTop &&
      row <= boxTop + 7 &&
      column >= boxLeft &&
      column <= boxLeft + 7
    ) {
      return false
    }
  }
  return (row * 7 + column * 11 + row * column) % 5 < 2
}

const CODE_PATH = Array.from({ length: MODULES * MODULES }, (_, index) => {
  const row = Math.floor(index / MODULES)
  const column = index % MODULES
  return isDark(row, column)
    ? `M${column * MODULE_SIZE} ${row * MODULE_SIZE}h${MODULE_SIZE}v${MODULE_SIZE}h-${MODULE_SIZE}Z`
    : ""
}).join("")

function QRCode({ color }: PhosphorIconProps) {
  return (
    <Svg width={CODE_SIZE} height={CODE_SIZE}>
      <Path d={CODE_PATH} fill={color} />
    </Svg>
  )
}

function CameraPlaceholder() {
  return (
    <View className="flex-1 items-center justify-center bg-media">
      <View className="mb-12 -rotate-6 rounded-xl bg-on-media p-2.5">
        <Icon as={QRCode} className="text-media" />
      </View>
    </View>
  )
}

export function QrScannerWithoutTorchExample() {
  return (
    <QRScanner
      className="flex-1"
      title="Scan to sign in"
      description="Open Settings on your other device."
    >
      <CameraPlaceholder />
    </QRScanner>
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct QRScannerWithoutTorchExample: View {
  var body: some View {
    QRScanner(title: "Scan to sign in", hint: "Open Settings on your other device.") {
      QRScannerCameraPlaceholder()
    }
    .ignoresSafeArea()
  }
}

enum QRCodeSample {
  static let count = 21
  static let module: CGFloat = 6
  static let padding: CGFloat = 10
  static let side = CGFloat(count) * module + padding * 2

  static func isDark(_ r: Int, _ c: Int) -> Bool {
    for (fr, fc) in [(0, 0), (0, 14), (14, 0)] {
      let i = r - fr
      let j = c - fc
      if (0...6).contains(i) && (0...6).contains(j) {
        return i == 0 || i == 6 || j == 0 || j == 6 || ((2...4).contains(i) && (2...4).contains(j))
      }
    }
    if r <= 7 && c <= 7 { return false }
    if r <= 7 && c >= 13 { return false }
    if r >= 13 && c <= 7 { return false }
    return (r * 7 + c * 11 + r * c) % 5 < 2
  }

  static let modules: Path = {
    var path = Path()
    for r in 0..<count {
      for c in 0..<count where isDark(r, c) {
        path.addRect(CGRect(x: padding + CGFloat(c) * module, y: padding + CGFloat(r) * module, width: module, height: module))
      }
    }
    return path
  }()
}

struct QRScannerCameraPlaceholder: View {
  var body: some View {
    GeometryReader { proxy in
      Canvas { context, _ in
        let card = CGRect(origin: .zero, size: CGSize(width: QRCodeSample.side, height: QRCodeSample.side))
        context.fill(Path(roundedRect: card, cornerRadius: Radius.xl, style: .continuous), with: .color(.onMedia))
        context.fill(QRCodeSample.modules, with: .color(.media))
      }
      .frame(width: QRCodeSample.side, height: QRCodeSample.side)
      .rotationEffect(.degrees(-6))
      .position(x: proxy.size.width / 2, y: proxy.size.height / 2 - 24)
    }
    .background(Color.media)
    .accessibilityHidden(true)
  }
}

let count = 21

let module: CGFloat = 6

let padding: CGFloat = 10

let side = CGFloat(count) * module + padding * 2

func isDark(_ r: Int, _ c: Int) -> Bool {
  for (fr, fc) in [(0, 0), (0, 14), (14, 0)] {
    let i = r - fr
    let j = c - fc
    if (0...6).contains(i) && (0...6).contains(j) {
      return i == 0 || i == 6 || j == 0 || j == 6 || ((2...4).contains(i) && (2...4).contains(j))
    }
  }
  if r <= 7 && c <= 7 { return false }
  if r <= 7 && c >= 13 { return false }
  if r >= 13 && c <= 7 { return false }
  return (r * 7 + c * 11 + r * c) % 5 < 2
}

let modules: Path = {
  var path = Path()
  for r in 0..<count {
    for c in 0..<count where isDark(r, c) {
      path.addRect(CGRect(x: padding + CGFloat(c) * module, y: padding + CGFloat(r) * module, width: module, height: module))
    }
  }
  return path
}
```

```kotlin
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import com.esuiss.ui.components.QrScanner

@Composable
fun QrScannerWithoutTorch() {
    QrScanner(
        modifier = Modifier.fillMaxSize(),
        title = "Scan to sign in",
        hint = "Open Settings on your other device.",
    ) {
        QrScannerCameraPlaceholder()
    }
}
```

## API Reference

### QRScanner

## Accessibility

- The dimmed surround and brackets are hidden from VoiceOver and TalkBack.
- The overlay is a polite live region, so changes to the title and description are announced on Android.
- The flashlight button has the `button` role, uses `torchLabel` as its label and reports `torch` as its selected state.
- State changes to `success` and `error` play a matching haptic notification.
- The shake and scan-line animations respect the system reduce motion setting, and the success scale is skipped when reduce motion is on.

## Notes

- Uses the `bg-media`, `text-scrim`, `text-on-media`, `text-success`, `text-danger` and `bg-accent` tokens; the flashlight button uses `bg-scrim` when off and `bg-on-media` with a `text-media` icon when on.
- The scan line restarts whenever the state returns to `idle`.