# Spinner

A loading indicator built on the native activity indicator, at any size and color.

Spinner 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/spinner

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

```tsx
import { Spinner } from "@/components/ui/spinner"

export function SpinnerExample() {
  return (
    <Spinner />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct SpinnerExample: View {
  var body: some View {
    Spinner()
      .foregroundStyle(Color.labelSecondary)
  }
}
```

```kotlin
import androidx.compose.runtime.Composable
import com.esuiss.ui.components.Spinner

@Composable
fun SpinnerExample() {
    Spinner()
}
```

`Spinner` wraps the native `ActivityIndicator` in a square `View`. The indicator is scaled from its native small size to the `size` you pass, so it can match text and icon sizes. Its color is set through a class.

## Installation

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

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

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

### Manual

**Uniwind**

1. Install the dependencies:

```bash title="Terminal"
npx expo install cn
```

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

```tsx title="uniwind/components/ui/spinner.tsx"
import { cn } from "cn"
import { ActivityIndicator, View } from "react-native"

const NATIVE_SIZE = 20

function Spinner({
  colorClassName = "accent-label-secondary",
  className,
  size = 16,
  accessibilityLabel = "Loading",
  ...props
}: Omit<React.ComponentProps<typeof ActivityIndicator>, "size"> & {
  size?: number
  colorClassName?: string
}) {
  return (
    <View
      role="progressbar"
      accessible
      accessibilityLabel={accessibilityLabel}
      accessibilityState={{ busy: true }}
      className={cn("shrink-0 items-center justify-center", className)}
      style={{ width: size, height: size }}
    >
      <ActivityIndicator
        colorClassName={colorClassName}
        size="small"
        style={{ transform: [{ scale: size / NATIVE_SIZE }] }}
        {...props}
      />
    </View>
  )
}

export { Spinner }
```

3. Update the import paths to match your project.

**NativeWind**

1. Install the dependencies:

```bash title="Terminal"
npx expo install cn nativewind
```

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

```tsx title="nativewind/components/ui/spinner.tsx"
import { cn } from "cn"
import { cssInterop } from "nativewind"
import { ActivityIndicator, View } from "react-native"

cssInterop(ActivityIndicator, {
  className: { target: "style", nativeStyleToProp: { color: true } },
})

const NATIVE_SIZE = 20

function Spinner({
  colorClassName = "text-label-secondary",
  className,
  size = 16,
  accessibilityLabel = "Loading",
  ...props
}: Omit<React.ComponentProps<typeof ActivityIndicator>, "size"> & {
  size?: number
  colorClassName?: string
}) {
  return (
    <View
      role="progressbar"
      accessible
      accessibilityLabel={accessibilityLabel}
      accessibilityState={{ busy: true }}
      className={cn("shrink-0 items-center justify-center", className)}
      style={{ width: size, height: size }}
    >
      <ActivityIndicator
        className={colorClassName}
        size="small"
        style={{ transform: [{ scale: size / NATIVE_SIZE }] }}
        {...props}
      />
    </View>
  )
}

export { Spinner }
```

3. Update the import paths to match your project.

**StyleSheet**

1. Copy the source into `components/ui/spinner.tsx`:

```tsx title="stylesheet/components/ui/spinner.tsx"
import { ActivityIndicator, View } from "react-native"
import { useTheme } from "@/components/ui/theme"

const NATIVE_SIZE = 20

function Spinner({
  color,
  style,
  size = 16,
  accessibilityLabel = "Loading",
  ...props
}: Omit<React.ComponentProps<typeof ActivityIndicator>, "size"> & {
  size?: number
}) {
  const { colors } = useTheme()
  return (
    <View
      role="progressbar"
      accessible
      accessibilityLabel={accessibilityLabel}
      accessibilityState={{ busy: true }}
      style={[
        {
          width: size,
          height: size,
          flexShrink: 0,
          alignItems: "center",
          justifyContent: "center",
        },
        style,
      ]}
    >
      <ActivityIndicator
        color={color ?? colors.labelSecondary}
        size="small"
        style={{ transform: [{ scale: size / NATIVE_SIZE }] }}
        {...props}
      />
    </View>
  )
}

export { Spinner }
```

2. 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/Spinner.swift"
import SwiftUI

public struct Spinner: View {
  public enum Size: CaseIterable, Sendable {
    case sm, `default`, lg, xl

    public var value: CGFloat {
      switch self {
      case .sm: 12
      case .default: 16
      case .lg: 24
      case .xl: 32
      }
    }
  }

  let dimension: CGFloat
  let label: Text

  public init(_ size: Size = .default, label: LocalizedStringKey = "Loading") {
    dimension = size.value
    self.label = Text(label)
  }

  public init(dimension: CGFloat, label: LocalizedStringKey = "Loading") {
    self.dimension = dimension
    self.label = Text(label)
  }

  public var body: some View {
    TimelineView(.periodic(from: .now, by: 0.1)) { context in
      let step = Int((context.date.timeIntervalSinceReferenceDate * 10).rounded(.down)) % 8
      SpinnerSpokes(dimension: dimension, progress: nil)
        .rotationEffect(.degrees(Double(step) * 45))
    }
    .frame(width: dimension, height: dimension)
    .accessibilityElement()
    .accessibilityLabel(label)
    .accessibilityAddTraits(.updatesFrequently)
  }
}

struct SpinnerSpokes: View {
  let dimension: CGFloat
  let progress: Double?

  var body: some View {
    let unit = dimension / 24
    ZStack {
      ForEach(0..<8, id: \.self) { index in
        Capsule()
          .fill(.foreground)
          .frame(width: 3.12 * unit, height: 7.2 * unit)
          .offset(y: -7.9 * unit)
          .rotationEffect(.degrees(Double(index) * 45))
          .opacity(opacity(index))
      }
    }
    .frame(width: dimension, height: dimension)
  }

  private func opacity(_ index: Int) -> Double {
    guard let progress else { return 0.2 + 0.8 * Double(index) / 7 }
    return min(max(progress * 8 - Double(index), 0), 1)
  }
}
```

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

import androidx.compose.animation.core.LinearEasing
import androidx.compose.animation.core.RepeatMode
import androidx.compose.animation.core.animateFloat
import androidx.compose.animation.core.infiniteRepeatable
import androidx.compose.animation.core.rememberInfiniteTransition
import androidx.compose.animation.core.tween
import androidx.compose.foundation.Canvas
import androidx.compose.foundation.layout.size
import androidx.compose.runtime.Composable
import androidx.compose.runtime.State
import androidx.compose.runtime.remember
import androidx.compose.runtime.mutableFloatStateOf
import androidx.compose.ui.Modifier
import androidx.compose.ui.geometry.CornerRadius
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.drawscope.DrawScope
import androidx.compose.ui.graphics.drawscope.rotate
import androidx.compose.ui.graphics.takeOrElse
import androidx.compose.ui.semantics.LiveRegionMode
import androidx.compose.ui.semantics.ProgressBarRangeInfo
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.liveRegion
import androidx.compose.ui.semantics.progressBarRangeInfo
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import kotlin.math.floor

internal const val SpinnerSpokes = 8

internal fun spinnerSpokeOpacity(index: Int): Float = 0.2f + 0.8f * index / (SpinnerSpokes - 1)

internal fun DrawScope.drawSpinnerSpokes(color: Color, rotation: Float = 0f, opacity: (Int) -> Float) {
    val unit = size.minDimension / 24f
    val center = Offset(size.width / 2f, size.height / 2f)
    rotate(rotation, center) {
        for (index in 0 until SpinnerSpokes) {
            val alpha = opacity(index).coerceIn(0f, 1f)
            if (alpha <= 0f) continue
            rotate(index * 360f / SpinnerSpokes, center) {
                drawRoundRect(
                    color = color,
                    topLeft = Offset(center.x - 1.56f * unit, center.y - 11.5f * unit),
                    size = Size(3.12f * unit, 7.2f * unit),
                    cornerRadius = CornerRadius(1.56f * unit),
                    alpha = alpha * color.alpha,
                )
            }
        }
    }
}

@Composable
fun Spinner(
    modifier: Modifier = Modifier,
    size: Dp = 16.dp,
    color: Color = Color.Unspecified,
    contentDescription: String = "Loading",
) {
    val tint = color.takeOrElse { LocalContentColor.current.takeOrElse { EsuissTheme.colors.label } }
    val reduced = formReducedMotion()
    val step: State<Float> = if (reduced) {
        remember { mutableFloatStateOf(0f) }
    } else {
        rememberInfiniteTransition(label = "spinner").animateFloat(
            initialValue = 0f,
            targetValue = SpinnerSpokes.toFloat(),
            animationSpec = infiniteRepeatable(tween(800, easing = LinearEasing), RepeatMode.Restart),
            label = "step",
        )
    }
    Canvas(
        modifier = modifier
            .size(size)
            .semantics {
                this.contentDescription = contentDescription
                progressBarRangeInfo = ProgressBarRangeInfo.Indeterminate
                liveRegion = LiveRegionMode.Polite
            },
    ) {
        val rotation = (floor(step.value) % SpinnerSpokes) * 360f / SpinnerSpokes
        drawSpinnerSpokes(tint, rotation) { spinnerSpokeOpacity(it) }
    }
}
```

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

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

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

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

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

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

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

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

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

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

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

## Usage

```tsx
import { Spinner } from "@/components/ui/spinner"
```

```tsx
<Spinner />
```

Set `size` in points (default `16`) and `colorClassName` with an `accent-*` class, such as `accent-accent` or `accent-danger`. Inside a button, use `accent-on-accent` on the `default` variant so the spinner matches the label.

## Examples

### Sizes

Spinners at 12, 16, 24 and 32 points.

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

```tsx
import { View } from "react-native"
import { Spinner } from "@/components/ui/spinner"

export function SpinnerSizesExample() {
  return (
    <View className="flex-row items-center gap-6">
      <Spinner size={12} />
      <Spinner />
      <Spinner size={24} />
      <Spinner size={32} />
    </View>
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct SpinnerSizesExample: View {
  var body: some View {
    HStack(spacing: 24) {
      Spinner(.sm)
      Spinner()
      Spinner(.lg)
      Spinner(.xl)
    }
    .foregroundStyle(Color.labelSecondary)
  }
}
```

```kotlin
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Row
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.unit.dp
import com.esuiss.ui.components.Spinner

@Composable
fun SpinnerRow(content: @Composable () -> Unit) {
    Row(horizontalArrangement = Arrangement.spacedBy(24.dp), verticalAlignment = Alignment.CenterVertically) {
        content()
    }
}

@Composable
fun SpinnerSizes() {
    SpinnerRow {
        Spinner(size = 12.dp)
        Spinner()
        Spinner(size = 24.dp)
        Spinner(size = 32.dp)
    }
}
```

### Colors

Spinners in the label, accent and danger colors.

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

```tsx
import { View } from "react-native"
import { Spinner } from "@/components/ui/spinner"

export function SpinnerColorsExample() {
  return (
    <View className="flex-row items-center gap-6">
      <Spinner size={24} colorClassName="accent-label" />
      <Spinner size={24} colorClassName="accent-accent" />
      <Spinner size={24} colorClassName="accent-danger" />
    </View>
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct SpinnerColorsExample: View {
  var body: some View {
    HStack(spacing: 24) {
      Spinner(.lg).foregroundStyle(Color.label)
      Spinner(.lg).foregroundStyle(Color.accent)
      Spinner(.lg).foregroundStyle(Color.danger)
    }
  }
}
```

```kotlin
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Row
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.unit.dp
import com.esuiss.ui.components.Spinner
import com.esuiss.ui.theme.EsuissTheme

@Composable
fun SpinnerRow(content: @Composable () -> Unit) {
    Row(horizontalArrangement = Arrangement.spacedBy(24.dp), verticalAlignment = Alignment.CenterVertically) {
        content()
    }
}

@Composable
fun SpinnerColors() {
    val colors = EsuissTheme.colors
    SpinnerRow {
        Spinner(size = 24.dp, color = colors.label)
        Spinner(size = 24.dp, color = colors.accent)
        Spinner(size = 24.dp, color = colors.danger)
    }
}
```

### In button

Spinners inside disabled buttons next to a label.

![Preview](https://uim.suiss.app/previews/components-spinner--in-button.light.webp)

```tsx
import { View } from "react-native"
import { Button } from "@/components/ui/button"
import { Spinner } from "@/components/ui/spinner"
import { Text } from "@/components/ui/text"

export function SpinnerInButtonExample() {
  return (
    <View className="items-start gap-3">
      <Button disabled>
        <Spinner colorClassName="accent-on-accent" />
        <Text>Saving</Text>
      </Button>
      <Button variant="secondary" disabled>
        <Spinner />
        <Text>Loading</Text>
      </Button>
    </View>
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct SpinnerInButtonExample: View {
  var body: some View {
    VStack(alignment: .leading, spacing: 12) {
      Button {} label: {
        HStack(spacing: 6) {
          Spinner().foregroundStyle(Color.onAccent)
          Text("Saving")
        }
      }
      .buttonStyle(.variant())
      Button {} label: {
        HStack(spacing: 6) {
          Spinner().foregroundStyle(Color.labelSecondary)
          Text("Loading")
        }
      }
      .buttonStyle(.variant(.secondary))
    }
    .disabled(true)
  }
}
```

```kotlin
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.runtime.Composable
import androidx.compose.ui.unit.dp
import com.esuiss.ui.components.Button
import com.esuiss.ui.components.ButtonVariant
import com.esuiss.ui.components.Spinner
import com.esuiss.ui.components.Text
import com.esuiss.ui.theme.EsuissTheme

@Composable
fun SpinnerInButton() {
    Column(verticalArrangement = Arrangement.spacedBy(12.dp)) {
        Button(onClick = {}, enabled = false) {
            Spinner(color = EsuissTheme.colors.onAccent)
            Text("Saving")
        }
        Button(onClick = {}, variant = ButtonVariant.Secondary, enabled = false) {
            Spinner()
            Text("Loading")
        }
    }
}
```

## API Reference

### Spinner

## Accessibility

- The wrapper has `role="progressbar"`, is `accessible`, and sets `busy: true` in `accessibilityState`.
- It is announced as `"Loading"` unless you pass another `accessibilityLabel`.

## Notes

- The default color uses the `label-secondary` token.
- The look of the indicator comes from the platform's native activity indicator, so it differs between iOS and Android.