# Switch

A toggle switch for turning a single setting on or off.

Switch 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/switch

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

```tsx
import * as React from "react"
import { Switch } from "@/components/ui/switch"

function SwitchDemo({ initial = false }: { initial?: boolean }) {
  const [checked, setChecked] = React.useState(initial)
  return <Switch checked={checked} onCheckedChange={setChecked} />
}

export function SwitchExample() {
  return (
    <SwitchDemo />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct SwitchExample: View {
  var body: some View {
    SwitchDemo(initial: false)
  }
}

struct SwitchDemo: View {
  var size: SwitchStyle.Size = .default
  var label: LocalizedStringKey?

  @State private var checked: Bool

  init(initial: Bool, size: SwitchStyle.Size = .default, label: LocalizedStringKey? = nil) {
    self.size = size
    self.label = label
    _checked = State(initialValue: initial)
  }

  var body: some View {
    if let label {
      Toggle(isOn: $checked) { EmptyView() }
        .toggleStyle(.switch(size: size))
        .accessibilityLabel(Text(label))
    } else {
      Toggle(isOn: $checked) { EmptyView() }
        .toggleStyle(.switch(size: size))
    }
  }
}
```

```kotlin
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 com.esuiss.ui.components.Switch

@Composable
fun SwitchExample() {
    SwitchDemo(initial = false)
}

@Composable
fun SwitchDemo(initial: Boolean) {
    var checked by rememberSaveable { mutableStateOf(initial) }
    Switch(checked, { checked = it })
}
```

`Switch` is a pressable track with a round thumb that slides between the off and on positions. The thumb animates with Reanimated and stretches slightly while pressed. It comes in two sizes, `default` and `sm`, and has an `invalid` state that adds a danger-colored border.

Use a switch for settings that take effect immediately. For choices that are submitted later, use Checkbox.

## Installation

```bash title="Terminal"
npx @esuiss/uim@latest add switch
```

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

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

### Manual

**Uniwind**

1. Install the dependencies:

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

2. Add the pieces it builds on: the primitives `components/primitives/switch.tsx`, `components/primitives/use-render.tsx`.

3. Copy the source into `components/ui/switch.tsx`:

```tsx title="uniwind/components/ui/switch.tsx"
import { cn } from "cn"
import * as React from "react"
import type { GestureResponderEvent } from "react-native"
import Animated, {
  Easing,
  ReduceMotion,
  useAnimatedStyle,
  withTiming,
} from "react-native-reanimated"
import * as SwitchPrimitives from "@/components/primitives/switch"
import { resolveClassName } from "@/components/primitives/use-render"

type SwitchSize = "default" | "sm"

const HIT_SLOP = { top: 8, bottom: 8, left: 12, right: 12 }

const THUMB = {
  default: { width: 32, pressedWidth: 36, travel: 16, pressedTravel: 12 },
  sm: { width: 26, pressedWidth: 30, travel: 14, pressedTravel: 10 },
} satisfies Record<SwitchSize, Record<string, number>>

const TIMING = {
  duration: 200,
  easing: Easing.bezier(0.32, 0.72, 0, 1),
  reduceMotion: ReduceMotion.System,
}

function SwitchThumb({
  size,
  pressed,
}: {
  size: SwitchSize
  pressed: boolean
}) {
  const { state } = SwitchPrimitives.useRootContext()
  const metrics = THUMB[size]
  const squeezed = pressed && !state.disabled && !state.readOnly
  const width = squeezed ? metrics.pressedWidth : metrics.width
  const travel = state.checked
    ? squeezed
      ? metrics.pressedTravel
      : metrics.travel
    : 0
  const animatedStyle = useAnimatedStyle(() => ({
    width: withTiming(width, TIMING),
    transform: [{ translateX: withTiming(travel, TIMING) }],
  }))
  return (
    <SwitchPrimitives.Thumb
      className={cn(
        "rounded-full bg-surface shadow-sm dark:bg-label",
        size === "sm" ? "h-4" : "h-5"
      )}
      render={<Animated.View style={animatedStyle} />}
    />
  )
}

function Switch({
  className,
  size = "default",
  invalid,
  onPressIn,
  onPressOut,
  ...props
}: React.ComponentProps<typeof SwitchPrimitives.Root> & {
  size?: SwitchSize
  invalid?: boolean
}) {
  const [pressed, setPressed] = React.useState(false)
  return (
    <SwitchPrimitives.Root
      className={(state) =>
        cn(
          "shrink-0 flex-row items-center rounded-full border-2",
          size === "sm" ? "h-5 w-11" : "h-6 w-13",
          state.checked
            ? state.disabled
              ? "border-transparent bg-accent-disabled"
              : "border-accent bg-accent"
            : state.disabled
              ? "border-transparent bg-control-disabled"
              : "border-transparent bg-label-quaternary",
          invalid && !state.disabled && "border-danger",
          resolveClassName(className, state)
        )
      }
      hitSlop={HIT_SLOP}
      onPressIn={(event: GestureResponderEvent) => {
        setPressed(true)
        onPressIn?.(event)
      }}
      onPressOut={(event: GestureResponderEvent) => {
        setPressed(false)
        onPressOut?.(event)
      }}
      {...props}
    >
      <SwitchThumb size={size} pressed={pressed} />
    </SwitchPrimitives.Root>
  )
}

export type { SwitchSize }
export { Switch }
```

4. Update the import paths to match your project.

**NativeWind**

1. Install the dependencies:

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

2. Add the pieces it builds on: the primitives `components/primitives/switch.tsx`, `components/primitives/use-render.tsx`.

3. Copy the source into `components/ui/switch.tsx`:

```tsx title="nativewind/components/ui/switch.tsx"
import { cn } from "cn"
import * as React from "react"
import type { GestureResponderEvent } from "react-native"
import Animated, {
  Easing,
  ReduceMotion,
  useAnimatedStyle,
  withTiming,
} from "react-native-reanimated"
import * as SwitchPrimitives from "@/components/primitives/switch"
import { resolveClassName } from "@/components/primitives/use-render"

type SwitchSize = "default" | "sm"

const HIT_SLOP = { top: 8, bottom: 8, left: 12, right: 12 }

const THUMB = {
  default: { width: 32, pressedWidth: 36, travel: 16, pressedTravel: 12 },
  sm: { width: 26, pressedWidth: 30, travel: 14, pressedTravel: 10 },
} satisfies Record<SwitchSize, Record<string, number>>

const TIMING = {
  duration: 200,
  easing: Easing.bezier(0.32, 0.72, 0, 1),
  reduceMotion: ReduceMotion.System,
}

function SwitchThumb({
  size,
  pressed,
}: {
  size: SwitchSize
  pressed: boolean
}) {
  const { state } = SwitchPrimitives.useRootContext()
  const metrics = THUMB[size]
  const squeezed = pressed && !state.disabled && !state.readOnly
  const width = squeezed ? metrics.pressedWidth : metrics.width
  const travel = state.checked
    ? squeezed
      ? metrics.pressedTravel
      : metrics.travel
    : 0
  const animatedStyle = useAnimatedStyle(() => ({
    width: withTiming(width, TIMING),
    transform: [{ translateX: withTiming(travel, TIMING) }],
  }))
  return (
    <SwitchPrimitives.Thumb
      className={cn(
        "rounded-full bg-surface shadow dark:bg-label",
        size === "sm" ? "h-4" : "h-5"
      )}
      render={<Animated.View style={animatedStyle} />}
    />
  )
}

function Switch({
  className,
  size = "default",
  invalid,
  onPressIn,
  onPressOut,
  ...props
}: React.ComponentProps<typeof SwitchPrimitives.Root> & {
  size?: SwitchSize
  invalid?: boolean
}) {
  const [pressed, setPressed] = React.useState(false)
  return (
    <SwitchPrimitives.Root
      className={(state) =>
        cn(
          "shrink-0 flex-row items-center rounded-full border-2",
          size === "sm" ? "h-5 w-11" : "h-6 w-[3.25rem]",
          state.checked
            ? state.disabled
              ? "border-transparent bg-accent-disabled"
              : "border-accent bg-accent"
            : state.disabled
              ? "border-transparent bg-control-disabled"
              : "border-transparent bg-label-quaternary",
          invalid && !state.disabled && "border-danger",
          resolveClassName(className, state)
        )
      }
      hitSlop={HIT_SLOP}
      onPressIn={(event: GestureResponderEvent) => {
        setPressed(true)
        onPressIn?.(event)
      }}
      onPressOut={(event: GestureResponderEvent) => {
        setPressed(false)
        onPressOut?.(event)
      }}
      {...props}
    >
      <SwitchThumb size={size} pressed={pressed} />
    </SwitchPrimitives.Root>
  )
}

export type { SwitchSize }
export { Switch }
```

4. Update the import paths to match your project.

**StyleSheet**

1. Install the dependencies:

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

2. Add the pieces it builds on: the primitives `components/primitives/switch.tsx`, `components/primitives/use-render.tsx`.

3. Copy the source into `components/ui/switch.tsx`:

```tsx title="stylesheet/components/ui/switch.tsx"
import * as React from "react"
import { type GestureResponderEvent, StyleSheet } from "react-native"
import Animated, {
  Easing,
  ReduceMotion,
  useAnimatedStyle,
  withTiming,
} from "react-native-reanimated"
import * as SwitchPrimitives from "@/components/primitives/switch"
import { shadow, useTheme } from "@/components/ui/theme"

type SwitchSize = "default" | "sm"

const HIT_SLOP = { top: 8, bottom: 8, left: 12, right: 12 }

const THUMB = {
  default: {
    height: 20,
    width: 32,
    pressedWidth: 36,
    travel: 16,
    pressedTravel: 12,
  },
  sm: {
    height: 16,
    width: 26,
    pressedWidth: 30,
    travel: 14,
    pressedTravel: 10,
  },
} satisfies Record<SwitchSize, Record<string, number>>

const TIMING = {
  duration: 200,
  easing: Easing.bezier(0.32, 0.72, 0, 1),
  reduceMotion: ReduceMotion.System,
}

const styles = StyleSheet.create({
  root: {
    flexShrink: 0,
    flexDirection: "row",
    alignItems: "center",
    borderRadius: 9999,
    borderWidth: 2,
  },
  default: { height: 24, width: 52 },
  sm: { height: 20, width: 44 },
  thumb: { borderRadius: 9999, ...shadow.sm },
})

function SwitchThumb({
  size,
  pressed,
}: {
  size: SwitchSize
  pressed: boolean
}) {
  const { colors, isDark } = useTheme()
  const { state } = SwitchPrimitives.useRootContext()
  const metrics = THUMB[size]
  const squeezed = pressed && !state.disabled && !state.readOnly
  const width = squeezed ? metrics.pressedWidth : metrics.width
  const travel = state.checked
    ? squeezed
      ? metrics.pressedTravel
      : metrics.travel
    : 0
  const animatedStyle = useAnimatedStyle(() => ({
    width: withTiming(width, TIMING),
    transform: [{ translateX: withTiming(travel, TIMING) }],
  }))
  return (
    <SwitchPrimitives.Thumb
      style={[
        styles.thumb,
        {
          height: metrics.height,
          backgroundColor: isDark ? colors.label : colors.surface,
        },
      ]}
      render={<Animated.View style={animatedStyle} />}
    />
  )
}

function Switch({
  style,
  size = "default",
  invalid,
  onPressIn,
  onPressOut,
  ...props
}: React.ComponentProps<typeof SwitchPrimitives.Root> & {
  size?: SwitchSize
  invalid?: boolean
}) {
  const { colors } = useTheme()
  const [pressed, setPressed] = React.useState(false)
  return (
    <SwitchPrimitives.Root
      style={(state) => [
        styles.root,
        styles[size],
        state.checked
          ? state.disabled
            ? {
                borderColor: "transparent",
                backgroundColor: colors.accentDisabled,
              }
            : { borderColor: colors.accent, backgroundColor: colors.accent }
          : {
              borderColor: "transparent",
              backgroundColor: state.disabled
                ? colors.controlDisabled
                : colors.labelQuaternary,
            },
        invalid && !state.disabled && { borderColor: colors.danger },
        typeof style === "function" ? style(state) : style,
      ]}
      hitSlop={HIT_SLOP}
      onPressIn={(event: GestureResponderEvent) => {
        setPressed(true)
        onPressIn?.(event)
      }}
      onPressOut={(event: GestureResponderEvent) => {
        setPressed(false)
        onPressOut?.(event)
      }}
      {...props}
    >
      <SwitchThumb size={size} pressed={pressed} />
    </SwitchPrimitives.Root>
  )
}

export type { SwitchSize }
export { Switch }
```

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/Switch.swift"
import SwiftUI

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

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

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

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

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

  let size: Size

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

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

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

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

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

  @Environment(\.labelsVisibility) private var visibility

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

public struct FieldTitle: View {
  let text: Text

  @Environment(\.isEnabled) private var isEnabled

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

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

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

public struct FieldDescription: View {
  let text: Text

  @Environment(\.fieldSetInset) private var inset

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

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

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

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

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

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

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

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

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

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

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

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

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

struct FieldSetInsetKey: PreferenceKey {
  static let defaultValue = false

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

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

  @State private var inset = false

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

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

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

  let text: Text
  let variant: Variant

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

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

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

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

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

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

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

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

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

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

extension EnvironmentValues {
  @Entry public var hapticsEnabled = true
}

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

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

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

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

  @Environment(\.hapticsEnabled) private var enabled

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

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

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

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

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

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

  @State private var count = 0

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

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

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

public struct Separator: View {
  let orientation: Axis

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

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

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

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

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

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

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

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

private struct TextVariantModifier: ViewModifier {
  let variant: TextVariant

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

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

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

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

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

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

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

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

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

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

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

5. Add the files to your app target.

**Jetpack Compose**

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

```kotlin title="build.gradle.kts"
implementation(platform("androidx.compose:compose-bom:2026.09.00"))
implementation("androidx.compose.foundation:foundation")
implementation("androidx.compose.ui:ui")
```

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

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

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

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

```kt title="kotlin/components/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/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))
}
```

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

## Usage

```tsx
import { Switch } from "@/components/ui/switch"
```

```tsx
<SwitchDemo />
```

Use `defaultChecked` for an uncontrolled switch, or `checked` with `onCheckedChange` to control it.

A switch has no visible text of its own. Pair it with a `Label` and link them with `accessibilityLabelledBy` and the label's `nativeID`, or set an `accessibilityLabel`. Give the `Label` an `onPress` that toggles the value if the label should be pressable too.

The switch has a hit slop around it, so it is easier to press than its visual size.

## Examples

### Checked

A switch that starts on.

![Preview](https://uim.suiss.app/previews/components-switch--checked.light.webp)

```tsx
import * as React from "react"
import { Switch } from "@/components/ui/switch"

function SwitchDemo({ initial = false }: { initial?: boolean }) {
  const [checked, setChecked] = React.useState(initial)
  return <Switch checked={checked} onCheckedChange={setChecked} />
}

export function SwitchCheckedExample() {
  return (
    <SwitchDemo initial />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct SwitchCheckedExample: View {
  var body: some View {
    SwitchDemo(initial: true)
  }
}

struct SwitchDemo: View {
  var size: SwitchStyle.Size = .default
  var label: LocalizedStringKey?

  @State private var checked: Bool

  init(initial: Bool, size: SwitchStyle.Size = .default, label: LocalizedStringKey? = nil) {
    self.size = size
    self.label = label
    _checked = State(initialValue: initial)
  }

  var body: some View {
    if let label {
      Toggle(isOn: $checked) { EmptyView() }
        .toggleStyle(.switch(size: size))
        .accessibilityLabel(Text(label))
    } else {
      Toggle(isOn: $checked) { EmptyView() }
        .toggleStyle(.switch(size: size))
    }
  }
}
```

```kotlin
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 com.esuiss.ui.components.Switch

@Composable
fun SwitchCheckedExample() {
    SwitchDemo(initial = true)
}

@Composable
fun SwitchDemo(initial: Boolean) {
    var checked by rememberSaveable { mutableStateOf(initial) }
    Switch(checked, { checked = it })
}
```

### Sizes

The `sm` and `default` sizes side by side.

![Preview](https://uim.suiss.app/previews/components-switch--sizes.light.webp)

```tsx
import { View } from "react-native"
import { Switch } from "@/components/ui/switch"

export function SwitchSizesExample() {
  return (
    <View className="flex-row items-center gap-4">
      <Switch size="sm" defaultChecked accessibilityLabel="Wi-Fi" />
      <Switch defaultChecked accessibilityLabel="Bluetooth" />
    </View>
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct SwitchSizesExample: View {
  var body: some View {
    HStack(spacing: 16) {
      SwitchDemo(initial: true, size: .sm, label: "Wi-Fi")
      SwitchDemo(initial: true, label: "Bluetooth")
    }
  }
}

struct SwitchDemo: View {
  var size: SwitchStyle.Size = .default
  var label: LocalizedStringKey?

  @State private var checked: Bool

  init(initial: Bool, size: SwitchStyle.Size = .default, label: LocalizedStringKey? = nil) {
    self.size = size
    self.label = label
    _checked = State(initialValue: initial)
  }

  var body: some View {
    if let label {
      Toggle(isOn: $checked) { EmptyView() }
        .toggleStyle(.switch(size: size))
        .accessibilityLabel(Text(label))
    } else {
      Toggle(isOn: $checked) { EmptyView() }
        .toggleStyle(.switch(size: size))
    }
  }
}
```

```kotlin
import androidx.compose.foundation.clickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Row
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.unit.dp
import com.esuiss.ui.components.Switch
import com.esuiss.ui.components.SwitchSize

fun Modifier.label(text: String): Modifier = semantics { contentDescription = text }

@Composable
fun Modifier.toggles(onToggle: () -> Unit): Modifier = clickable(
    interactionSource = remember { MutableInteractionSource() },
    indication = null,
    onClick = onToggle,
)

@Composable
fun SwitchSizes() {
    var wifi by rememberSaveable { mutableStateOf(true) }
    var bluetooth by rememberSaveable { mutableStateOf(true) }
    Row(horizontalArrangement = Arrangement.spacedBy(16.dp), verticalAlignment = Alignment.CenterVertically) {
        Switch(wifi, { wifi = it }, Modifier.label("Wi-Fi"), size = SwitchSize.Sm)
        Switch(bluetooth, { bluetooth = it }, Modifier.label("Bluetooth"))
    }
}
```

### With label

A controlled switch next to a pressable label.

![Preview](https://uim.suiss.app/previews/components-switch--with-label.light.webp)

```tsx
import * as React from "react"
import { View } from "react-native"
import { Label } from "@/components/ui/label"
import { Switch } from "@/components/ui/switch"

function WithLabelDemo() {
  const [checked, setChecked] = React.useState(false)
  return (
    <View className="flex-row items-center gap-2">
      <Switch
        accessibilityLabelledBy="airplane-mode"
        checked={checked}
        onCheckedChange={setChecked}
      />
      <Label nativeID="airplane-mode" onPress={() => setChecked((v) => !v)}>
        Airplane mode
      </Label>
    </View>
  )
}

export function SwitchWithLabelExample() {
  return (
    <WithLabelDemo />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct WithLabelDemo: View {
  @State private var checked = false

  var body: some View {
    Toggle(isOn: $checked) {
      FieldLabel("Airplane mode")
    }
    .toggleStyle(.switch(size: .default))
  }
}
```

```kotlin
import androidx.compose.foundation.clickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Row
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.unit.dp
import com.esuiss.ui.components.Label
import com.esuiss.ui.components.Switch

fun Modifier.label(text: String): Modifier = semantics { contentDescription = text }

@Composable
fun Modifier.toggles(onToggle: () -> Unit): Modifier = clickable(
    interactionSource = remember { MutableInteractionSource() },
    indication = null,
    onClick = onToggle,
)

@Composable
fun SwitchWithLabel() {
    var checked by rememberSaveable { mutableStateOf(false) }
    Row(horizontalArrangement = Arrangement.spacedBy(8.dp), verticalAlignment = Alignment.CenterVertically) {
        Switch(checked, { checked = it }, Modifier.label("Airplane mode"))
        Label("Airplane mode", Modifier.toggles { checked = !checked })
    }
}
```

### With description

A switch with a label and a line of supporting text.

![Preview](https://uim.suiss.app/previews/components-switch--with-description.light.webp)

```tsx
import * as React from "react"
import { View } from "react-native"
import { Label } from "@/components/ui/label"
import { Switch } from "@/components/ui/switch"
import { Text } from "@/components/ui/text"

function WithDescriptionDemo() {
  const [checked, setChecked] = React.useState(true)
  return (
    <View className="flex-row items-center justify-between gap-4 rounded-2xl bg-surface-secondary p-4">
      <View className="flex-1 gap-1">
        <Label nativeID="marketing" onPress={() => setChecked((v) => !v)}>
          Marketing emails
        </Label>
        <Text className="text-sm text-label-secondary">
          Receive emails about new products.
        </Text>
      </View>
      <Switch
        accessibilityLabelledBy="marketing"
        checked={checked}
        onCheckedChange={setChecked}
      />
    </View>
  )
}

export function SwitchWithDescriptionExample() {
  return (
    <WithDescriptionDemo />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct WithDescriptionDemo: View {
  @State private var checked = true

  var body: some View {
    HStack(spacing: 16) {
      VStack(alignment: .leading, spacing: 4) {
        FieldLabel("Marketing emails")
          .onTapGesture { checked.toggle() }
        Text("Receive emails about new products.")
          .textStyle(.sm)
          .foregroundStyle(Color.labelSecondary)
      }
      .frame(maxWidth: .infinity, alignment: .leading)
      Toggle(isOn: $checked) { EmptyView() }
        .toggleStyle(.switch(size: .default))
        .accessibilityLabel(Text("Marketing emails"))
    }
    .padding(16)
    .background(Color.surfaceSecondary, in: RoundedRectangle(cornerRadius: Radius.xl2, style: .continuous))
  }
}
```

```kotlin
import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.unit.dp
import com.esuiss.ui.components.Label
import com.esuiss.ui.components.Switch
import com.esuiss.ui.components.Text
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

fun Modifier.label(text: String): Modifier = semantics { contentDescription = text }

@Composable
fun Modifier.toggles(onToggle: () -> Unit): Modifier = clickable(
    interactionSource = remember { MutableInteractionSource() },
    indication = null,
    onClick = onToggle,
)

@Composable
fun SwitchWithDescription() {
    var checked by rememberSaveable { mutableStateOf(true) }
    val colors = EsuissTheme.colors
    val shape = RoundedCornerShape(Radius.xl2)
    Row(
        modifier = Modifier
            .fillMaxWidth()
            .background(colors.surfaceSecondary, shape)
            .padding(16.dp),
        horizontalArrangement = Arrangement.spacedBy(16.dp),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        Column(Modifier.weight(1f), verticalArrangement = Arrangement.spacedBy(4.dp)) {
            Label("Marketing emails", Modifier.toggles { checked = !checked })
            Text("Receive emails about new products.", style = Typography.sm.copy(color = colors.labelSecondary))
        }
        Switch(checked, { checked = it }, Modifier.label("Marketing emails"))
    }
}
```

### Disabled

Disabled switches in the off and on states.

![Preview](https://uim.suiss.app/previews/components-switch--disabled.light.webp)

```tsx
import { View } from "react-native"
import { Switch } from "@/components/ui/switch"

export function SwitchDisabledExample() {
  return (
    <View className="gap-4">
      <Switch disabled checked={false} onCheckedChange={() => {}} />
      <Switch disabled checked onCheckedChange={() => {}} />
    </View>
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct SwitchDisabledExample: View {
  var body: some View {
    VStack(alignment: .leading, spacing: 16) {
      Toggle(isOn: .constant(false)) { EmptyView() }
      Toggle(isOn: .constant(true)) { EmptyView() }
    }
    .toggleStyle(.switch(size: .default))
    .disabled(true)
  }
}
```

```kotlin
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.runtime.Composable
import androidx.compose.ui.unit.dp
import com.esuiss.ui.components.Switch

@Composable
fun SwitchDisabled() {
    Column(verticalArrangement = Arrangement.spacedBy(16.dp)) {
        Switch(false, {}, enabled = false)
        Switch(true, {}, enabled = false)
    }
}
```

### Invalid

A switch with the `invalid` border next to its label.

![Preview](https://uim.suiss.app/previews/components-switch--invalid.light.webp)

```tsx
import { View } from "react-native"
import { Label } from "@/components/ui/label"
import { Switch } from "@/components/ui/switch"

export function SwitchInvalidExample() {
  return (
    <View className="flex-row items-center gap-2">
      <Switch invalid accessibilityLabelledBy="terms-switch" />
      <Label nativeID="terms-switch">Accept terms</Label>
    </View>
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct InvalidDemo: View {
  @State private var checked = false

  var body: some View {
    Toggle(isOn: $checked) {
      FieldLabel("Accept terms")
    }
    .toggleStyle(.switch(size: .default))
    .invalid()
  }
}
```

```kotlin
import androidx.compose.foundation.clickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Row
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.unit.dp
import com.esuiss.ui.components.Label
import com.esuiss.ui.components.Switch

fun Modifier.label(text: String): Modifier = semantics { contentDescription = text }

@Composable
fun Modifier.toggles(onToggle: () -> Unit): Modifier = clickable(
    interactionSource = remember { MutableInteractionSource() },
    indication = null,
    onClick = onToggle,
)

@Composable
fun SwitchInvalid() {
    var checked by rememberSaveable { mutableStateOf(false) }
    Row(horizontalArrangement = Arrangement.spacedBy(8.dp), verticalAlignment = Alignment.CenterVertically) {
        Switch(checked, { checked = it }, Modifier.label("Accept terms"), invalid = true)
        Label("Accept terms")
    }
}
```

## API Reference

### Switch

## Accessibility

- The root has the `switch` role and reports `checked` and `disabled` in its accessibility state, so VoiceOver and TalkBack announce whether it is on.
- The thumb is hidden from the accessibility tree.
- Label every switch with `accessibilityLabel` or `accessibilityLabelledBy`.
- The thumb animation follows the system reduce motion setting.

## Notes

- The track uses `bg-accent` when on and `bg-label-quaternary` when off, with `bg-accent-disabled` and `bg-control-disabled` for the disabled states.
- The thumb uses `bg-surface`, or `bg-label` in dark mode.
- Light and dark colors follow the system appearance.