# Collapsible

A section that shows or hides its content when a trigger is pressed.

Collapsible 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/collapsible

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

```tsx
import { CaretUpDownIcon } from "phosphor-react-native"
import * as React from "react"
import { View } from "react-native"
import { Button } from "@/components/ui/button"
import { Collapsible, CollapsibleContent, CollapsibleTrigger } from "@/components/ui/collapsible"
import { Icon } from "@/components/ui/icon"
import { Text } from "@/components/ui/text"

const repositories = ["esuiss/ui", "esuiss/docs", "esuiss/cli"]

function CollapsibleDemo({
  initialOpen = false,
  disabled = false,
}: {
  initialOpen?: boolean
  disabled?: boolean
}) {
  const [open, setOpen] = React.useState(initialOpen)
  return (
    <Collapsible
      open={open}
      onOpenChange={setOpen}
      disabled={disabled}
      className="w-full gap-2"
    >
      <View className="flex-row items-center justify-between gap-4 px-3">
        <Text className="text-sm font-medium">
          @ademceper starred 3 repositories
        </Text>
        <CollapsibleTrigger
          render={
            <Button variant="ghost" size="icon-sm" disabled={disabled}>
              <Icon as={CaretUpDownIcon} className="size-4" />
            </Button>
          }
        />
      </View>
      <View className="rounded-2xl bg-surface-secondary px-4 py-2">
        <Text className="text-sm">{repositories[0]}</Text>
      </View>
      <CollapsibleContent className="gap-2">
        {repositories.slice(1).map((repository) => (
          <View
            key={repository}
            className="rounded-2xl bg-surface-secondary px-4 py-2"
          >
            <Text className="text-sm">{repository}</Text>
          </View>
        ))}
      </CollapsibleContent>
    </Collapsible>
  )
}

export function CollapsibleOpenByDefaultExample() {
  return (
    <CollapsibleDemo initialOpen />
  )
}
```

```swift
import EsuissUI
import PhosphorSwift
import SwiftUI

struct CollapsibleOpenByDefaultExample: View {
  var body: some View {
    CollapsibleDemo(initialOpen: true)
  }
}

let collapsibleRepositories = ["esuiss/ui", "esuiss/docs", "esuiss/cli"]

struct CollapsibleDemo: View {
  var disabled = false

  @State private var open: Bool

  init(initialOpen: Bool = false, disabled: Bool = false) {
    self.disabled = disabled
    _open = State(initialValue: initialOpen)
  }

  var body: some View {
    Collapsible(isExpanded: $open, spacing: 8) {
      HStack(spacing: 16) {
        Text("@ademceper starred 3 repositories")
          .textStyle(.sm, weight: .medium)
          .foregroundStyle(Color.label)
          .frame(maxWidth: .infinity, alignment: .leading)
        CollapsibleTrigger {
          Ph.caretUpDown.regular
            .frame(width: 16, height: 16)
        }
        .buttonStyle(.variant(.ghost, size: .iconSm))
        .disabled(disabled)
      }
      .padding(.horizontal, 12)
      CollapsibleRepository(name: collapsibleRepositories[0])
      CollapsibleContent {
        VStack(spacing: 8) {
          ForEach(collapsibleRepositories.dropFirst(), id: \.self) { repository in
            CollapsibleRepository(name: repository)
          }
        }
      }
    }
    .frame(maxWidth: .infinity)
  }
}

struct CollapsibleRepository: View {
  let name: String

  var body: some View {
    Text(verbatim: name)
      .textStyle(.sm)
      .foregroundStyle(Color.label)
      .padding(.horizontal, 16)
      .padding(.vertical, 8)
      .frame(maxWidth: .infinity, alignment: .leading)
      .background(Color.surfaceSecondary, in: RoundedRectangle(cornerRadius: Radius.xl2, style: .continuous))
  }
}
```

```kotlin
import androidx.compose.foundation.background
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.saveable.rememberSaveable
import androidx.compose.runtime.setValue
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.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.CaretUpDown
import com.esuiss.ui.components.Button
import com.esuiss.ui.components.ButtonSize
import com.esuiss.ui.components.ButtonVariant
import com.esuiss.ui.components.Collapsible
import com.esuiss.ui.components.CollapsibleContent
import com.esuiss.ui.components.Icon
import com.esuiss.ui.components.Text
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

@Composable
fun CollapsibleOpenByDefaultExample() {
    CollapsibleDemo(initialOpen = true)
}

val CollapsibleRepositories = listOf("esuiss/ui", "esuiss/docs", "esuiss/cli")

@Composable
fun CollapsibleRepository(name: String) {
    Text(
        name,
        modifier = Modifier
            .fillMaxWidth()
            .background(EsuissTheme.colors.surfaceSecondary, RoundedCornerShape(Radius.xl2))
            .padding(horizontal = 16.dp, vertical = 8.dp),
        style = Typography.sm,
    )
}

@Composable
fun CollapsibleDemo(initialOpen: Boolean = false, disabled: Boolean = false) {
    var open by rememberSaveable { mutableStateOf(initialOpen) }
    Collapsible(
        expanded = open,
        onExpandedChange = { open = it },
        modifier = Modifier.fillMaxWidth(),
        enabled = !disabled,
    ) {
        Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
            Row(
                modifier = Modifier.fillMaxWidth().padding(horizontal = 12.dp),
                horizontalArrangement = Arrangement.spacedBy(16.dp),
                verticalAlignment = Alignment.CenterVertically,
            ) {
                Text(
                    "@ademceper starred 3 repositories",
                    modifier = Modifier.weight(1f),
                    style = Typography.sm.copy(fontWeight = FontWeight.Medium),
                )
                Button(
                    onClick = { open = !open },
                    variant = ButtonVariant.Ghost,
                    size = ButtonSize.IconSm,
                    enabled = !disabled,
                ) {
                    Icon(PhosphorIcons.Regular.CaretUpDown, contentDescription = "Toggle", size = 16.dp)
                }
            }
            CollapsibleRepository(CollapsibleRepositories[0])
            CollapsibleContent {
                Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
                    CollapsibleRepositories.drop(1).forEach { CollapsibleRepository(it) }
                }
            }
        }
    }
}
```

`Collapsible` is an unstyled root with a `CollapsibleTrigger` and a `CollapsibleContent` panel. It handles the open state and accessibility, and leaves the look to you.

Use it for a single show-more section. For a list of sections where opening one can close another, use Accordion.

## Installation

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

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

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

### Manual

**Uniwind**

1. Add the pieces it builds on: the primitives `components/primitives/collapsible.tsx`.

2. Copy the source into `components/ui/collapsible.tsx`:

```tsx title="uniwind/components/ui/collapsible.tsx"
import * as CollapsiblePrimitive from "@/components/primitives/collapsible"

const Collapsible = CollapsiblePrimitive.Root

const CollapsibleTrigger = CollapsiblePrimitive.Trigger

const CollapsibleContent = CollapsiblePrimitive.Panel

export { Collapsible, CollapsibleContent, CollapsibleTrigger }
```

3. Update the import paths to match your project.

**NativeWind**

1. Add the pieces it builds on: the primitives `components/primitives/collapsible.tsx`.

2. Copy the source into `components/ui/collapsible.tsx`:

```tsx title="nativewind/components/ui/collapsible.tsx"
import * as CollapsiblePrimitive from "@/components/primitives/collapsible"

const Collapsible = CollapsiblePrimitive.Root

const CollapsibleTrigger = CollapsiblePrimitive.Trigger

const CollapsibleContent = CollapsiblePrimitive.Panel

export { Collapsible, CollapsibleContent, CollapsibleTrigger }
```

3. Update the import paths to match your project.

**StyleSheet**

1. Add the pieces it builds on: the primitives `components/primitives/collapsible.tsx`.

2. Copy the source into `components/ui/collapsible.tsx`:

```tsx title="stylesheet/components/ui/collapsible.tsx"
import * as CollapsiblePrimitive from "@/components/primitives/collapsible"

const Collapsible = CollapsiblePrimitive.Root

const CollapsibleTrigger = CollapsiblePrimitive.Trigger

const CollapsibleContent = CollapsiblePrimitive.Panel

export { Collapsible, CollapsibleContent, CollapsibleTrigger }
```

3. Update the import paths to match your project.

**SwiftUI**

1. Target iOS 17 or later.

2. 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)
}
```

3. Copy the source:

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

public struct Collapsible<Content: View>: View {
  let external: Binding<Bool>?
  let spacing: CGFloat
  let content: Content

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

  public init(
    isExpanded: Binding<Bool>,
    spacing: CGFloat = 0,
    @ViewBuilder content: () -> Content
  ) {
    self.external = isExpanded
    self.spacing = spacing
    self.content = content()
  }

  public init(spacing: CGFloat = 0, @ViewBuilder content: () -> Content) {
    self.external = nil
    self.spacing = spacing
    self.content = content()
  }

  public var body: some View {
    let binding = external ?? $local
    let animation: Animation = reduceMotion ? .linear(duration: 0.15) : .easeInOut(duration: 0.2)
    VStack(alignment: .leading, spacing: spacing) {
      content
    }
    .environment(
      \.collapsible,
      CollapsibleContext(
        isExpanded: binding.wrappedValue,
        toggle: { withAnimation(animation) { binding.wrappedValue.toggle() } }
      )
    )
  }
}

struct CollapsibleContext: Sendable {
  var isExpanded = false
  var toggle: @MainActor @Sendable () -> Void = {}
}

extension EnvironmentValues {
  @Entry var collapsible = CollapsibleContext()
}

public struct CollapsibleTrigger<Label: View>: View {
  let label: Label

  @Environment(\.collapsible) private var collapsible

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

  public var body: some View {
    Button {
      collapsible.toggle()
    } label: {
      label
    }
    .accessibilityValue(Text(collapsible.isExpanded ? "Expanded" : "Collapsed"))
  }
}

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

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

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

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

  public var body: some View {
    if collapsible.isExpanded {
      content
        .transition(reduceMotion ? .opacity : .opacity.combined(with: .offset(y: -8)))
    }
  }
}
```

4. 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/Collapsible.kt"
package com.esuiss.ui.components

import androidx.compose.animation.AnimatedVisibility
import androidx.compose.animation.core.tween
import androidx.compose.animation.expandVertically
import androidx.compose.animation.fadeIn
import androidx.compose.animation.fadeOut
import androidx.compose.animation.shrinkVertically
import androidx.compose.foundation.clickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.ColumnScope
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
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.semantics.Role
import androidx.compose.ui.semantics.collapse
import androidx.compose.ui.semantics.expand
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.semantics.stateDescription

@Immutable
private data class CollapsibleState(
    val expanded: Boolean,
    val enabled: Boolean,
    val onExpandedChange: (Boolean) -> Unit,
)

private val LocalCollapsible = staticCompositionLocalOf<CollapsibleState?> { null }

@Composable
fun Collapsible(
    expanded: Boolean,
    onExpandedChange: (Boolean) -> Unit,
    modifier: Modifier = Modifier,
    enabled: Boolean = true,
    content: @Composable ColumnScope.() -> Unit,
) {
    CompositionLocalProvider(LocalCollapsible provides CollapsibleState(expanded, enabled, onExpandedChange)) {
        Column(modifier = modifier, content = content)
    }
}

@Composable
fun CollapsibleTrigger(
    modifier: Modifier = Modifier,
    content: @Composable RowScope.() -> Unit,
) {
    val state = LocalCollapsible.current ?: error("CollapsibleTrigger must be used within a Collapsible.")
    Row(
        modifier = modifier
            .semantics {
                stateDescription = if (state.expanded) "Expanded" else "Collapsed"
                if (state.enabled) {
                    if (state.expanded) {
                        collapse { state.onExpandedChange(false); true }
                    } else {
                        expand { state.onExpandedChange(true); true }
                    }
                }
            }
            .clickable(
                interactionSource = remember { MutableInteractionSource() },
                indication = null,
                enabled = state.enabled,
                role = Role.Button,
                onClick = { state.onExpandedChange(!state.expanded) },
            ),
        verticalAlignment = Alignment.CenterVertically,
        content = content,
    )
}

@Composable
fun CollapsibleContent(
    modifier: Modifier = Modifier,
    content: @Composable ColumnScope.() -> Unit,
) {
    val state = LocalCollapsible.current ?: error("CollapsibleContent must be used within a Collapsible.")
    AnimatedVisibility(
        visible = state.expanded,
        modifier = modifier,
        enter = expandVertically(tween(250), expandFrom = Alignment.Top) + fadeIn(tween(250)),
        exit = shrinkVertically(tween(200), shrinkTowards = Alignment.Top) + fadeOut(tween(200)),
    ) {
        Column(content = content)
    }
}
```

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

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

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

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

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

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

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

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

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

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

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

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

enum class ButtonGroupOrientation { Horizontal, Vertical }

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

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

internal object ButtonGroupFill

private object ButtonGroupDivider

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

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

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

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

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

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

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

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

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

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

val LocalContentStyle = compositionLocalOf { TextStyle.Default }

val LocalContentColor = compositionLocalOf { Color.Unspecified }

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

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

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

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

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

## Usage

```tsx
<CollapsibleDemo initialOpen />
```

Put any content in `CollapsibleTrigger`, for example a `Text` and a caret `Icon`, and use `render` to render it as a `Button`. Use `open` with `onOpenChange` for controlled state, or `defaultOpen` for uncontrolled.

Set `keepMounted` on `CollapsibleContent` to keep the content mounted while closed.

## Examples

### Default

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

```tsx
import { CaretUpDownIcon } from "phosphor-react-native"
import * as React from "react"
import { View } from "react-native"
import { Button } from "@/components/ui/button"
import { Collapsible, CollapsibleContent, CollapsibleTrigger } from "@/components/ui/collapsible"
import { Icon } from "@/components/ui/icon"
import { Text } from "@/components/ui/text"

const repositories = ["esuiss/ui", "esuiss/docs", "esuiss/cli"]

function CollapsibleDemo({
  initialOpen = false,
  disabled = false,
}: {
  initialOpen?: boolean
  disabled?: boolean
}) {
  const [open, setOpen] = React.useState(initialOpen)
  return (
    <Collapsible
      open={open}
      onOpenChange={setOpen}
      disabled={disabled}
      className="w-full gap-2"
    >
      <View className="flex-row items-center justify-between gap-4 px-3">
        <Text className="text-sm font-medium">
          @ademceper starred 3 repositories
        </Text>
        <CollapsibleTrigger
          render={
            <Button variant="ghost" size="icon-sm" disabled={disabled}>
              <Icon as={CaretUpDownIcon} className="size-4" />
            </Button>
          }
        />
      </View>
      <View className="rounded-2xl bg-surface-secondary px-4 py-2">
        <Text className="text-sm">{repositories[0]}</Text>
      </View>
      <CollapsibleContent className="gap-2">
        {repositories.slice(1).map((repository) => (
          <View
            key={repository}
            className="rounded-2xl bg-surface-secondary px-4 py-2"
          >
            <Text className="text-sm">{repository}</Text>
          </View>
        ))}
      </CollapsibleContent>
    </Collapsible>
  )
}

export function CollapsibleExample() {
  return (
    <CollapsibleDemo />
  )
}
```

```swift
import EsuissUI
import PhosphorSwift
import SwiftUI

let collapsibleRepositories = ["esuiss/ui", "esuiss/docs", "esuiss/cli"]

struct CollapsibleDemo: View {
  var disabled = false

  @State private var open: Bool

  init(initialOpen: Bool = false, disabled: Bool = false) {
    self.disabled = disabled
    _open = State(initialValue: initialOpen)
  }

  var body: some View {
    Collapsible(isExpanded: $open, spacing: 8) {
      HStack(spacing: 16) {
        Text("@ademceper starred 3 repositories")
          .textStyle(.sm, weight: .medium)
          .foregroundStyle(Color.label)
          .frame(maxWidth: .infinity, alignment: .leading)
        CollapsibleTrigger {
          Ph.caretUpDown.regular
            .frame(width: 16, height: 16)
        }
        .buttonStyle(.variant(.ghost, size: .iconSm))
        .disabled(disabled)
      }
      .padding(.horizontal, 12)
      CollapsibleRepository(name: collapsibleRepositories[0])
      CollapsibleContent {
        VStack(spacing: 8) {
          ForEach(collapsibleRepositories.dropFirst(), id: \.self) { repository in
            CollapsibleRepository(name: repository)
          }
        }
      }
    }
    .frame(maxWidth: .infinity)
  }
}

struct CollapsibleRepository: View {
  let name: String

  var body: some View {
    Text(verbatim: name)
      .textStyle(.sm)
      .foregroundStyle(Color.label)
      .padding(.horizontal, 16)
      .padding(.vertical, 8)
      .frame(maxWidth: .infinity, alignment: .leading)
      .background(Color.surfaceSecondary, in: RoundedRectangle(cornerRadius: Radius.xl2, style: .continuous))
  }
}
```

```kotlin
import androidx.compose.foundation.background
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.saveable.rememberSaveable
import androidx.compose.runtime.setValue
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.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.CaretUpDown
import com.esuiss.ui.components.Button
import com.esuiss.ui.components.ButtonSize
import com.esuiss.ui.components.ButtonVariant
import com.esuiss.ui.components.Collapsible
import com.esuiss.ui.components.CollapsibleContent
import com.esuiss.ui.components.Icon
import com.esuiss.ui.components.Text
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

val CollapsibleRepositories = listOf("esuiss/ui", "esuiss/docs", "esuiss/cli")

@Composable
fun CollapsibleRepository(name: String) {
    Text(
        name,
        modifier = Modifier
            .fillMaxWidth()
            .background(EsuissTheme.colors.surfaceSecondary, RoundedCornerShape(Radius.xl2))
            .padding(horizontal = 16.dp, vertical = 8.dp),
        style = Typography.sm,
    )
}

@Composable
fun CollapsibleDemo(initialOpen: Boolean = false, disabled: Boolean = false) {
    var open by rememberSaveable { mutableStateOf(initialOpen) }
    Collapsible(
        expanded = open,
        onExpandedChange = { open = it },
        modifier = Modifier.fillMaxWidth(),
        enabled = !disabled,
    ) {
        Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
            Row(
                modifier = Modifier.fillMaxWidth().padding(horizontal = 12.dp),
                horizontalArrangement = Arrangement.spacedBy(16.dp),
                verticalAlignment = Alignment.CenterVertically,
            ) {
                Text(
                    "@ademceper starred 3 repositories",
                    modifier = Modifier.weight(1f),
                    style = Typography.sm.copy(fontWeight = FontWeight.Medium),
                )
                Button(
                    onClick = { open = !open },
                    variant = ButtonVariant.Ghost,
                    size = ButtonSize.IconSm,
                    enabled = !disabled,
                ) {
                    Icon(PhosphorIcons.Regular.CaretUpDown, contentDescription = "Toggle", size = 16.dp)
                }
            }
            CollapsibleRepository(CollapsibleRepositories[0])
            CollapsibleContent {
                Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
                    CollapsibleRepositories.drop(1).forEach { CollapsibleRepository(it) }
                }
            }
        }
    }
}
```

### Disabled

A disabled collapsible whose trigger cannot toggle it.

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

```tsx
import { CaretUpDownIcon } from "phosphor-react-native"
import * as React from "react"
import { View } from "react-native"
import { Button } from "@/components/ui/button"
import { Collapsible, CollapsibleContent, CollapsibleTrigger } from "@/components/ui/collapsible"
import { Icon } from "@/components/ui/icon"
import { Text } from "@/components/ui/text"

const repositories = ["esuiss/ui", "esuiss/docs", "esuiss/cli"]

function CollapsibleDemo({
  initialOpen = false,
  disabled = false,
}: {
  initialOpen?: boolean
  disabled?: boolean
}) {
  const [open, setOpen] = React.useState(initialOpen)
  return (
    <Collapsible
      open={open}
      onOpenChange={setOpen}
      disabled={disabled}
      className="w-full gap-2"
    >
      <View className="flex-row items-center justify-between gap-4 px-3">
        <Text className="text-sm font-medium">
          @ademceper starred 3 repositories
        </Text>
        <CollapsibleTrigger
          render={
            <Button variant="ghost" size="icon-sm" disabled={disabled}>
              <Icon as={CaretUpDownIcon} className="size-4" />
            </Button>
          }
        />
      </View>
      <View className="rounded-2xl bg-surface-secondary px-4 py-2">
        <Text className="text-sm">{repositories[0]}</Text>
      </View>
      <CollapsibleContent className="gap-2">
        {repositories.slice(1).map((repository) => (
          <View
            key={repository}
            className="rounded-2xl bg-surface-secondary px-4 py-2"
          >
            <Text className="text-sm">{repository}</Text>
          </View>
        ))}
      </CollapsibleContent>
    </Collapsible>
  )
}

export function CollapsibleDisabledExample() {
  return (
    <CollapsibleDemo disabled />
  )
}
```

```swift
import EsuissUI
import PhosphorSwift
import SwiftUI

struct CollapsibleDisabledExample: View {
  var body: some View {
    CollapsibleDemo(disabled: true)
  }
}

let collapsibleRepositories = ["esuiss/ui", "esuiss/docs", "esuiss/cli"]

struct CollapsibleDemo: View {
  var disabled = false

  @State private var open: Bool

  init(initialOpen: Bool = false, disabled: Bool = false) {
    self.disabled = disabled
    _open = State(initialValue: initialOpen)
  }

  var body: some View {
    Collapsible(isExpanded: $open, spacing: 8) {
      HStack(spacing: 16) {
        Text("@ademceper starred 3 repositories")
          .textStyle(.sm, weight: .medium)
          .foregroundStyle(Color.label)
          .frame(maxWidth: .infinity, alignment: .leading)
        CollapsibleTrigger {
          Ph.caretUpDown.regular
            .frame(width: 16, height: 16)
        }
        .buttonStyle(.variant(.ghost, size: .iconSm))
        .disabled(disabled)
      }
      .padding(.horizontal, 12)
      CollapsibleRepository(name: collapsibleRepositories[0])
      CollapsibleContent {
        VStack(spacing: 8) {
          ForEach(collapsibleRepositories.dropFirst(), id: \.self) { repository in
            CollapsibleRepository(name: repository)
          }
        }
      }
    }
    .frame(maxWidth: .infinity)
  }
}

struct CollapsibleRepository: View {
  let name: String

  var body: some View {
    Text(verbatim: name)
      .textStyle(.sm)
      .foregroundStyle(Color.label)
      .padding(.horizontal, 16)
      .padding(.vertical, 8)
      .frame(maxWidth: .infinity, alignment: .leading)
      .background(Color.surfaceSecondary, in: RoundedRectangle(cornerRadius: Radius.xl2, style: .continuous))
  }
}
```

```kotlin
import androidx.compose.foundation.background
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.saveable.rememberSaveable
import androidx.compose.runtime.setValue
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.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.CaretUpDown
import com.esuiss.ui.components.Button
import com.esuiss.ui.components.ButtonSize
import com.esuiss.ui.components.ButtonVariant
import com.esuiss.ui.components.Collapsible
import com.esuiss.ui.components.CollapsibleContent
import com.esuiss.ui.components.Icon
import com.esuiss.ui.components.Text
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

@Composable
fun CollapsibleDisabledExample() {
    CollapsibleDemo(disabled = true)
}

val CollapsibleRepositories = listOf("esuiss/ui", "esuiss/docs", "esuiss/cli")

@Composable
fun CollapsibleRepository(name: String) {
    Text(
        name,
        modifier = Modifier
            .fillMaxWidth()
            .background(EsuissTheme.colors.surfaceSecondary, RoundedCornerShape(Radius.xl2))
            .padding(horizontal = 16.dp, vertical = 8.dp),
        style = Typography.sm,
    )
}

@Composable
fun CollapsibleDemo(initialOpen: Boolean = false, disabled: Boolean = false) {
    var open by rememberSaveable { mutableStateOf(initialOpen) }
    Collapsible(
        expanded = open,
        onExpandedChange = { open = it },
        modifier = Modifier.fillMaxWidth(),
        enabled = !disabled,
    ) {
        Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
            Row(
                modifier = Modifier.fillMaxWidth().padding(horizontal = 12.dp),
                horizontalArrangement = Arrangement.spacedBy(16.dp),
                verticalAlignment = Alignment.CenterVertically,
            ) {
                Text(
                    "@ademceper starred 3 repositories",
                    modifier = Modifier.weight(1f),
                    style = Typography.sm.copy(fontWeight = FontWeight.Medium),
                )
                Button(
                    onClick = { open = !open },
                    variant = ButtonVariant.Ghost,
                    size = ButtonSize.IconSm,
                    enabled = !disabled,
                ) {
                    Icon(PhosphorIcons.Regular.CaretUpDown, contentDescription = "Toggle", size = 16.dp)
                }
            }
            CollapsibleRepository(CollapsibleRepositories[0])
            CollapsibleContent {
                Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
                    CollapsibleRepositories.drop(1).forEach { CollapsibleRepository(it) }
                }
            }
        }
    }
}
```

## Accessibility

- The trigger has the `button` role with `expanded` and `disabled` state.
- Closed content is hidden from VoiceOver and TalkBack.