# Aspect Ratio

A view that keeps its content at a fixed width-to-height ratio.

Aspect Ratio 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/aspect-ratio

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

```tsx
import { Image, View } from "react-native"
import { AspectRatio } from "@/components/ui/aspect-ratio"

const imageUri =
"https://images.unsplash.com/photo-1588345921523-c2dcdb7f1dcd?w=800&dpr=2&q=80"

export function AspectRatioExample() {
  return (
    <View className="w-full overflow-hidden rounded-lg">
      <AspectRatio ratio={16 / 9}>
        <Image source={{ uri: imageUri }} className="h-full w-full" />
      </AspectRatio>
    </View>
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct AspectRatioExample: View {
  var body: some View {
    AspectRatio(ratio: 16 / 9) {
      AspectRatioPhoto()
    }
    .clipShape(RoundedRectangle(cornerRadius: Radius.lg, style: .continuous))
    .frame(maxWidth: .infinity)
  }
}

struct AspectRatioPhoto: View {
  var body: some View {
    AsyncImage(
      url: URL(string: "https://images.unsplash.com/photo-1588345921523-c2dcdb7f1dcd?w=800&dpr=2&q=80")
    ) { phase in
      if let image = phase.image {
        image.resizable().scaledToFill()
      } else {
        Color.surfaceSecondary
      }
    }
    .frame(maxWidth: .infinity, maxHeight: .infinity)
  }
}
```

```kotlin
import androidx.compose.foundation.Image
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.runtime.Composable
import androidx.compose.runtime.remember
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Brush
import androidx.compose.ui.graphics.painter.BrushPainter
import androidx.compose.ui.layout.ContentScale
import androidx.compose.ui.unit.Dp
import com.adamglin.phosphoricons.regular.Image
import com.esuiss.ui.components.AspectRatio
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius

@Composable
fun AspectRatioExample() {
    AspectRatioPhoto(null, 16f / 9f)
}

@Composable
fun AspectRatioPhoto(width: Dp?, ratio: Float) {
    val colors = EsuissTheme.colors
    val photo = remember(colors) { BrushPainter(Brush.linearGradient(listOf(colors.teal, colors.blue, colors.indigo))) }
    Box(
        (if (width != null) Modifier.width(width) else Modifier.fillMaxWidth())
            .clip(RoundedCornerShape(Radius.lg)),
    ) {
        AspectRatio(ratio) {
            Image(photo, contentDescription = null, modifier = Modifier.fillMaxSize(), contentScale = ContentScale.Crop)
        }
    }
}
```

`AspectRatio` is a `View` that sets the `aspectRatio` style from its `ratio` prop. Its height follows from the width it is given, so the content keeps its shape at any screen size.

Use it for images, video thumbnails and placeholders that must not stretch.

## Installation

```bash title="Terminal"
npx @esuiss/uim@latest add aspect-ratio
```

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

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

### Manual

**Uniwind**

1. Add the pieces it builds on: the primitives `components/primitives/aspect-ratio.tsx`.

2. Copy the source into `components/ui/aspect-ratio.tsx`:

```tsx title="uniwind/components/ui/aspect-ratio.tsx"
import * as AspectRatioPrimitive from "@/components/primitives/aspect-ratio"

const AspectRatio = AspectRatioPrimitive.Root

export { AspectRatio }
```

3. Update the import paths to match your project.

**NativeWind**

1. Add the pieces it builds on: the primitives `components/primitives/aspect-ratio.tsx`.

2. Copy the source into `components/ui/aspect-ratio.tsx`:

```tsx title="nativewind/components/ui/aspect-ratio.tsx"
import * as AspectRatioPrimitive from "@/components/primitives/aspect-ratio"

const AspectRatio = AspectRatioPrimitive.Root

export { AspectRatio }
```

3. Update the import paths to match your project.

**StyleSheet**

1. Add the pieces it builds on: the primitives `components/primitives/aspect-ratio.tsx`.

2. Copy the source into `components/ui/aspect-ratio.tsx`:

```tsx title="stylesheet/components/ui/aspect-ratio.tsx"
import * as AspectRatioPrimitive from "@/components/primitives/aspect-ratio"

const AspectRatio = AspectRatioPrimitive.Root

export { AspectRatio }
```

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/AspectRatio.swift"
import SwiftUI

public struct AspectRatio<Content: View>: View {
  let ratio: CGFloat
  let content: Content

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

  public var body: some View {
    Color.clear
      .aspectRatio(ratio, contentMode: .fit)
      .overlay {
        content
      }
      .clipped()
  }
}
```

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:

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

import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.BoxScope
import androidx.compose.foundation.layout.aspectRatio
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier

@Composable
fun AspectRatio(
    ratio: Float,
    modifier: Modifier = Modifier,
    content: @Composable BoxScope.() -> Unit,
) {
    Box(
        modifier = modifier.fillMaxWidth().aspectRatio(ratio),
        propagateMinConstraints = true,
        content = content,
    )
}
```

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

## Usage

```tsx
<View className="w-full overflow-hidden rounded-lg">
  <AspectRatio ratio={16 / 9}>
    <Image source={{ uri: imageUri }} className="h-full w-full" />
  </AspectRatio>
</View>
```

Pass `ratio` as width divided by height, such as `16 / 9`. It defaults to `1`. Size the content inside with `h-full w-full`, and put rounding or clipping on a parent view.

## Examples

### Square

A square image with `ratio={1}`.

![Preview](https://uim.suiss.app/previews/components-aspect-ratio--square.light.webp)

```tsx
import { Image, View } from "react-native"
import { AspectRatio } from "@/components/ui/aspect-ratio"

const imageUri =
"https://images.unsplash.com/photo-1588345921523-c2dcdb7f1dcd?w=800&dpr=2&q=80"

export function AspectRatioSquareExample() {
  return (
    <View className="w-48 overflow-hidden rounded-lg">
      <AspectRatio ratio={1}>
        <Image source={{ uri: imageUri }} className="h-full w-full" />
      </AspectRatio>
    </View>
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct AspectRatioSquareExample: View {
  var body: some View {
    AspectRatio(ratio: 1) {
      AspectRatioPhoto()
    }
    .clipShape(RoundedRectangle(cornerRadius: Radius.lg, style: .continuous))
    .frame(width: 192)
  }
}

struct AspectRatioPhoto: View {
  var body: some View {
    AsyncImage(
      url: URL(string: "https://images.unsplash.com/photo-1588345921523-c2dcdb7f1dcd?w=800&dpr=2&q=80")
    ) { phase in
      if let image = phase.image {
        image.resizable().scaledToFill()
      } else {
        Color.surfaceSecondary
      }
    }
    .frame(maxWidth: .infinity, maxHeight: .infinity)
  }
}
```

```kotlin
import androidx.compose.foundation.Image
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.runtime.Composable
import androidx.compose.runtime.remember
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Brush
import androidx.compose.ui.graphics.painter.BrushPainter
import androidx.compose.ui.layout.ContentScale
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
import com.adamglin.phosphoricons.regular.Image
import com.esuiss.ui.components.AspectRatio
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius

@Composable
fun AspectRatioSquareExample() {
    AspectRatioPhoto(192.dp, 1f)
}

@Composable
fun AspectRatioPhoto(width: Dp?, ratio: Float) {
    val colors = EsuissTheme.colors
    val photo = remember(colors) { BrushPainter(Brush.linearGradient(listOf(colors.teal, colors.blue, colors.indigo))) }
    Box(
        (if (width != null) Modifier.width(width) else Modifier.fillMaxWidth())
            .clip(RoundedCornerShape(Radius.lg)),
    ) {
        AspectRatio(ratio) {
            Image(photo, contentDescription = null, modifier = Modifier.fillMaxSize(), contentScale = ContentScale.Crop)
        }
    }
}
```

### Portrait

A tall image with `ratio={9 / 16}`.

![Preview](https://uim.suiss.app/previews/components-aspect-ratio--portrait.light.webp)

```tsx
import { Image, View } from "react-native"
import { AspectRatio } from "@/components/ui/aspect-ratio"

const imageUri =
"https://images.unsplash.com/photo-1588345921523-c2dcdb7f1dcd?w=800&dpr=2&q=80"

export function AspectRatioPortraitExample() {
  return (
    <View className="w-40 overflow-hidden rounded-lg">
      <AspectRatio ratio={9 / 16}>
        <Image source={{ uri: imageUri }} className="h-full w-full" />
      </AspectRatio>
    </View>
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct AspectRatioPortraitExample: View {
  var body: some View {
    AspectRatio(ratio: 9 / 16) {
      AspectRatioPhoto()
    }
    .clipShape(RoundedRectangle(cornerRadius: Radius.lg, style: .continuous))
    .frame(width: 160)
  }
}

struct AspectRatioPhoto: View {
  var body: some View {
    AsyncImage(
      url: URL(string: "https://images.unsplash.com/photo-1588345921523-c2dcdb7f1dcd?w=800&dpr=2&q=80")
    ) { phase in
      if let image = phase.image {
        image.resizable().scaledToFill()
      } else {
        Color.surfaceSecondary
      }
    }
    .frame(maxWidth: .infinity, maxHeight: .infinity)
  }
}
```

```kotlin
import androidx.compose.foundation.Image
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.runtime.Composable
import androidx.compose.runtime.remember
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Brush
import androidx.compose.ui.graphics.painter.BrushPainter
import androidx.compose.ui.layout.ContentScale
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
import com.adamglin.phosphoricons.regular.Image
import com.esuiss.ui.components.AspectRatio
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius

@Composable
fun AspectRatioPortraitExample() {
    AspectRatioPhoto(160.dp, 9f / 16f)
}

@Composable
fun AspectRatioPhoto(width: Dp?, ratio: Float) {
    val colors = EsuissTheme.colors
    val photo = remember(colors) { BrushPainter(Brush.linearGradient(listOf(colors.teal, colors.blue, colors.indigo))) }
    Box(
        (if (width != null) Modifier.width(width) else Modifier.fillMaxWidth())
            .clip(RoundedCornerShape(Radius.lg)),
    ) {
        AspectRatio(ratio) {
            Image(photo, contentDescription = null, modifier = Modifier.fillMaxSize(), contentScale = ContentScale.Crop)
        }
    }
}
```

### Placeholder

A placeholder surface with an icon instead of an image.

![Preview](https://uim.suiss.app/previews/components-aspect-ratio--placeholder.light.webp)

```tsx
import { ImageIcon } from "phosphor-react-native"
import { View } from "react-native"
import { AspectRatio } from "@/components/ui/aspect-ratio"
import { Icon } from "@/components/ui/icon"
import { Text } from "@/components/ui/text"

export function AspectRatioPlaceholderExample() {
  return (
    <View className="w-full">
      <AspectRatio ratio={16 / 9}>
        <View className="bg-surface-secondary h-full w-full items-center justify-center gap-2 rounded-lg">
          <Icon as={ImageIcon} className="text-label-secondary size-8" />
          <Text variant="muted">16 / 9</Text>
        </View>
      </AspectRatio>
    </View>
  )
}
```

```swift
import EsuissUI
import PhosphorSwift
import SwiftUI

struct AspectRatioPlaceholderExample: View {
  var body: some View {
    AspectRatio(ratio: 16 / 9) {
      VStack(spacing: 8) {
        Ph.image.regular
          .frame(width: 32, height: 32)
          .foregroundStyle(Color.labelSecondary)
        Text("16 / 9")
          .textVariant(.muted)
      }
      .frame(maxWidth: .infinity, maxHeight: .infinity)
      .background(Color.surfaceSecondary, in: RoundedRectangle(cornerRadius: Radius.lg, style: .continuous))
    }
    .frame(maxWidth: .infinity)
  }
}
```

```kotlin
import androidx.compose.foundation.Image
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.Image
import com.esuiss.ui.components.AspectRatio
import com.esuiss.ui.components.Icon
import com.esuiss.ui.components.Text
import com.esuiss.ui.components.TextVariant
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius

@Composable
fun AspectRatioPlaceholder() {
    val colors = EsuissTheme.colors
    AspectRatio(16f / 9f) {
        Column(
            Modifier.fillMaxSize().background(colors.surfaceSecondary, RoundedCornerShape(Radius.lg)),
            verticalArrangement = Arrangement.spacedBy(8.dp, Alignment.CenterVertically),
            horizontalAlignment = Alignment.CenterHorizontally,
        ) {
            Icon(PhosphorIcons.Regular.Image, contentDescription = null, size = 32.dp, tint = colors.labelSecondary)
            Text("16 / 9", variant = TextVariant.Muted)
        }
    }
}
```

## Accessibility

- The view adds no role; give images their own `accessibilityLabel`.