# Marker

A small inline label that marks a point in a list or feed, such as a date divider or a notice.

Marker 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/marker

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

```tsx
import { CalendarBlankIcon, InfoIcon } from "phosphor-react-native"
import { View } from "react-native"
import { Icon } from "@/components/ui/icon"
import { Marker, MarkerContent, MarkerIcon } from "@/components/ui/marker"

export function MarkerVariantsExample() {
  return (
    <View className="gap-8">
      <Marker>
        <MarkerIcon>
          <Icon as={InfoIcon} />
        </MarkerIcon>
        <MarkerContent>Messages are end-to-end encrypted.</MarkerContent>
      </Marker>
      <Marker variant="separator">
        <MarkerContent>Today</MarkerContent>
      </Marker>
      <Marker variant="border">
        <MarkerIcon>
          <Icon as={CalendarBlankIcon} />
        </MarkerIcon>
        <MarkerContent>Upcoming</MarkerContent>
      </Marker>
    </View>
  )
}
```

```swift
import EsuissUI
import PhosphorSwift
import SwiftUI

struct MarkerVariantsExample: View {
  var body: some View {
    VStack(spacing: 32) {
      Marker {
        MarkerIcon { Ph.info.regular }
        MarkerContent("Messages are end-to-end encrypted.")
      }
      Marker(.separator) {
        MarkerContent("Today")
      }
      Marker(.border) {
        MarkerIcon { Ph.calendarBlank.regular }
        MarkerContent("Upcoming")
      }
    }
    .frame(maxWidth: .infinity)
  }
}
```

```kotlin
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
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.CalendarBlank
import com.adamglin.phosphoricons.regular.Info
import com.esuiss.ui.components.Icon
import com.esuiss.ui.components.Marker
import com.esuiss.ui.components.MarkerContent
import com.esuiss.ui.components.MarkerIcon
import com.esuiss.ui.components.MarkerVariant

@Composable
fun MarkerVariants() {
    Column(Modifier.fillMaxWidth(), verticalArrangement = Arrangement.spacedBy(32.dp)) {
        Marker {
            MarkerIcon { Icon(PhosphorIcons.Regular.Info, contentDescription = null) }
            MarkerContent("Messages are end-to-end encrypted.")
        }
        Marker(variant = MarkerVariant.Separator) {
            MarkerContent("Today")
        }
        Marker(variant = MarkerVariant.Border) {
            MarkerIcon { Icon(PhosphorIcons.Regular.CalendarBlank, contentDescription = null) }
            MarkerContent("Upcoming")
        }
    }
}
```

`Marker` is a row of secondary text with an optional icon. It has three variants: `default` for a plain row, `separator` for centered text with a line on each side, and `border` for a row with a bottom border.

Use `separator` for date dividers in a chat or feed, `border` for section headings, and `default` for short notices.

## Installation

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

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

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

The CLI also adds what it builds on: [Icon](/docs/components/icon), [Text](/docs/components/text).

### Manual

**Uniwind**

1. Install the dependencies:

```bash title="Terminal"
npx expo install class-variance-authority cn
```

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

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

```tsx title="uniwind/components/ui/marker.tsx"
import { cva, type VariantProps } from "class-variance-authority"
import { cn } from "cn"
import * as React from "react"
import { View, type ViewProps } from "react-native"
import type { RenderProp } from "@/components/primitives/types"
import { useRender } from "@/components/primitives/use-render"
import { IconClassContext } from "@/components/ui/icon"
import { Text, TextClassContext } from "@/components/ui/text"

type MarkerVariant = "default" | "separator" | "border"

const MarkerContext = React.createContext<MarkerVariant>("default")

const markerVariants = cva("min-h-4 w-full flex-row items-center gap-2", {
  variants: {
    variant: {
      default: "",
      separator: "",
      border: "border-b border-separator pb-2",
    },
  },
  defaultVariants: {
    variant: "default",
  },
})

function MarkerLine() {
  return (
    <View
      accessible={false}
      importantForAccessibility="no"
      className="h-px min-w-0 flex-1 bg-separator"
    />
  )
}

function Marker({
  className,
  variant = "default",
  render,
  children,
  ...props
}: ViewProps &
  VariantProps<typeof markerVariants> & {
    render?: RenderProp<Record<string, unknown>, Record<string, never>>
  }) {
  const resolved = variant ?? "default"
  const separator = resolved === "separator"
  const element = useRender({
    defaultComponent: View,
    render,
    props: [
      {
        className: cn(markerVariants({ variant: resolved }), className),
        children: (
          <>
            {separator ? <MarkerLine /> : null}
            {children}
            {separator ? <MarkerLine /> : null}
          </>
        ),
      },
      props,
    ],
  })
  return (
    <MarkerContext.Provider value={resolved}>
      <TextClassContext.Provider value="text-start text-sm text-label-secondary">
        <IconClassContext.Provider value="size-4 text-label-secondary">
          {element}
        </IconClassContext.Provider>
      </TextClassContext.Provider>
    </MarkerContext.Provider>
  )
}

function MarkerIcon({ className, ...props }: ViewProps) {
  return (
    <View
      accessible={false}
      importantForAccessibility="no-hide-descendants"
      className={cn("size-4 shrink-0 items-center justify-center", className)}
      {...props}
    />
  )
}

function MarkerContent({
  className,
  ...props
}: React.ComponentProps<typeof Text>) {
  const variant = React.useContext(MarkerContext)
  return (
    <Text
      className={cn(
        "min-w-0 shrink",
        variant === "separator" && "flex-none shrink-0 text-center",
        className
      )}
      {...props}
    />
  )
}

export { Marker, MarkerContent, MarkerIcon }
```

4. Update the import paths to match your project.

**NativeWind**

1. Install the dependencies:

```bash title="Terminal"
npx expo install class-variance-authority cn
```

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

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

```tsx title="nativewind/components/ui/marker.tsx"
import { cva, type VariantProps } from "class-variance-authority"
import { cn } from "cn"
import * as React from "react"
import { View, type ViewProps } from "react-native"
import type { RenderProp } from "@/components/primitives/types"
import { useRender } from "@/components/primitives/use-render"
import { IconClassContext } from "@/components/ui/icon"
import { Text, TextClassContext } from "@/components/ui/text"

type MarkerVariant = "default" | "separator" | "border"

const MarkerContext = React.createContext<MarkerVariant>("default")

const markerVariants = cva("min-h-4 w-full flex-row items-center gap-2", {
  variants: {
    variant: {
      default: "",
      separator: "",
      border: "border-b border-separator pb-2",
    },
  },
  defaultVariants: {
    variant: "default",
  },
})

function MarkerLine() {
  return (
    <View
      accessible={false}
      importantForAccessibility="no"
      className="h-px min-w-0 flex-1 bg-separator"
    />
  )
}

function Marker({
  className,
  variant = "default",
  render,
  children,
  ...props
}: ViewProps &
  VariantProps<typeof markerVariants> & {
    render?: RenderProp<Record<string, unknown>, Record<string, never>>
  }) {
  const resolved = variant ?? "default"
  const separator = resolved === "separator"
  const element = useRender({
    defaultComponent: View,
    render,
    props: [
      {
        className: cn(markerVariants({ variant: resolved }), className),
        children: (
          <>
            {separator ? <MarkerLine /> : null}
            {children}
            {separator ? <MarkerLine /> : null}
          </>
        ),
      },
      props,
    ],
  })
  return (
    <MarkerContext.Provider value={resolved}>
      <TextClassContext.Provider value="text-start text-sm text-label-secondary">
        <IconClassContext.Provider value="size-4 text-label-secondary">
          {element}
        </IconClassContext.Provider>
      </TextClassContext.Provider>
    </MarkerContext.Provider>
  )
}

function MarkerIcon({ className, ...props }: ViewProps) {
  return (
    <View
      accessible={false}
      importantForAccessibility="no-hide-descendants"
      className={cn("size-4 shrink-0 items-center justify-center", className)}
      {...props}
    />
  )
}

function MarkerContent({
  className,
  ...props
}: React.ComponentProps<typeof Text>) {
  const variant = React.useContext(MarkerContext)
  return (
    <Text
      className={cn(
        "min-w-0 shrink",
        variant === "separator" && "flex-none shrink-0 text-center",
        className
      )}
      {...props}
    />
  )
}

export { Marker, MarkerContent, MarkerIcon }
```

4. Update the import paths to match your project.

**StyleSheet**

1. Add the pieces it builds on: [Icon](/docs/components/icon), [Text](/docs/components/text), and the primitives `components/primitives/types.tsx`, `components/primitives/use-render.tsx`.

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

```tsx title="stylesheet/components/ui/marker.tsx"
import * as React from "react"
import { StyleSheet, View, type ViewProps } from "react-native"
import type { RenderProp } from "@/components/primitives/types"
import { useRender } from "@/components/primitives/use-render"
import { IconSizeContext } from "@/components/ui/icon"
import { Text, TextStyleContext } from "@/components/ui/text"
import { fontSize, useTheme } from "@/components/ui/theme"

type MarkerVariant = "default" | "separator" | "border"

const MarkerContext = React.createContext<MarkerVariant>("default")

const styles = StyleSheet.create({
  root: {
    minHeight: 16,
    width: "100%",
    flexDirection: "row",
    alignItems: "center",
    gap: 8,
  },
  border: { borderBottomWidth: 1, paddingBottom: 8 },
  line: { height: 1, minWidth: 0, flex: 1 },
  icon: {
    width: 16,
    height: 16,
    flexShrink: 0,
    alignItems: "center",
    justifyContent: "center",
  },
  content: { minWidth: 0, flexShrink: 1 },
  contentSeparator: { flexShrink: 0, textAlign: "center" },
})

function MarkerLine() {
  const { colors } = useTheme()
  return (
    <View
      accessible={false}
      importantForAccessibility="no"
      style={[styles.line, { backgroundColor: colors.separator }]}
    />
  )
}

function Marker({
  style,
  variant = "default",
  render,
  children,
  ...props
}: ViewProps & {
  variant?: MarkerVariant
  render?: RenderProp<Record<string, unknown>, Record<string, never>>
}) {
  const { colors } = useTheme()
  const separator = variant === "separator"
  const element = useRender({
    defaultComponent: View,
    render,
    props: [
      {
        style: [
          styles.root,
          variant === "border" && [
            styles.border,
            { borderColor: colors.separator },
          ],
          style,
        ],
        children: (
          <>
            {separator ? <MarkerLine /> : null}
            {children}
            {separator ? <MarkerLine /> : null}
          </>
        ),
      },
      props,
    ],
  })
  return (
    <MarkerContext.Provider value={variant}>
      <TextStyleContext.Provider
        value={{
          ...fontSize.sm,
          textAlign: "left",
          color: colors.labelSecondary,
        }}
      >
        <IconSizeContext.Provider value={16}>
          {element}
        </IconSizeContext.Provider>
      </TextStyleContext.Provider>
    </MarkerContext.Provider>
  )
}

function MarkerIcon({ style, ...props }: ViewProps) {
  return (
    <View
      accessible={false}
      importantForAccessibility="no-hide-descendants"
      style={[styles.icon, style]}
      {...props}
    />
  )
}

function MarkerContent({ style, ...props }: React.ComponentProps<typeof Text>) {
  const variant = React.useContext(MarkerContext)
  return (
    <Text
      style={[
        styles.content,
        variant === "separator" && styles.contentSeparator,
        style,
      ]}
      {...props}
    />
  )
}

export { Marker, MarkerContent, MarkerIcon }
```

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 and every file it uses:

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

public enum MarkerVariant: CaseIterable, Sendable {
  case `default`, separator, border
}

extension EnvironmentValues {
  @Entry var markerVariant: MarkerVariant = .default
}

public struct Marker<Content: View>: View {
  let variant: MarkerVariant
  let content: Content

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

  public var body: some View {
    Group {
      switch variant {
      case .default:
        row
      case .separator:
        HStack(spacing: 12) {
          line
          row.fixedSize(horizontal: true, vertical: false)
          line
        }
      case .border:
        row
          .padding(.bottom, 8)
          .overlay(alignment: .bottom) {
            Rectangle().fill(Color.separator).frame(height: 1)
          }
      }
    }
    .frame(maxWidth: .infinity, minHeight: 16, alignment: .leading)
    .environment(\.markerVariant, variant)
  }

  private var row: some View {
    HStack(spacing: 8) {
      content
    }
    .scaledTextStyle(.sm)
    .foregroundStyle(Color.labelSecondary)
    .tint(Color.labelSecondary)
    .multilineTextAlignment(variant == .separator ? .center : .leading)
    .accessibilityElement(children: .combine)
  }

  private var line: some View {
    Rectangle()
      .fill(Color.separator)
      .frame(height: 1)
      .frame(maxWidth: .infinity)
      .accessibilityHidden(true)
  }
}

extension Marker where Content == MarkerLabel {
  public init(_ title: LocalizedStringKey, icon: Image? = nil, variant: MarkerVariant = .default) {
    self.init(variant) { MarkerLabel(title: Text(title), icon: icon) }
  }

  public init(verbatim title: String, icon: Image? = nil, variant: MarkerVariant = .default) {
    self.init(variant) { MarkerLabel(title: Text(verbatim: title), icon: icon) }
  }
}

public struct MarkerLabel: View {
  let title: Text
  let icon: Image?

  public var body: some View {
    if let icon {
      MarkerIcon { icon }
    }
    MarkerContent { title }
  }
}

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

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

  public var body: some View {
    content
      .frame(width: 16, height: 16)
      .accessibilityHidden(true)
  }
}

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

  @Environment(\.markerVariant) private var variant

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

  public var body: some View {
    content
      .fixedSize(horizontal: variant == .separator, vertical: true)
      .frame(maxWidth: variant == .separator ? nil : .infinity, alignment: .leading)
  }
}

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

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

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

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

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

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

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

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

private struct TextVariantModifier: ViewModifier {
  let variant: TextVariant

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

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

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

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

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

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

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

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

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

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

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

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

import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.BoxScope
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.heightIn
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.drawBehind
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.vector.ImageVector
import androidx.compose.ui.semantics.clearAndSetSemantics
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography

enum class MarkerVariant { Default, Separator, Border }

private val LocalMarkerVariant = staticCompositionLocalOf { MarkerVariant.Default }

@Composable
fun Marker(
    modifier: Modifier = Modifier,
    variant: MarkerVariant = MarkerVariant.Default,
    content: @Composable RowScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val border = if (variant == MarkerVariant.Border) {
        Modifier
            .drawBehind {
                val stroke = 1.dp.toPx()
                drawRect(colors.separator, Offset(0f, size.height - stroke), Size(size.width, stroke))
            }
            .padding(bottom = 8.dp)
    } else {
        Modifier
    }
    Row(
        modifier = modifier
            .fillMaxWidth()
            .heightIn(min = 16.dp)
            .then(border)
            .semantics(mergeDescendants = true) {},
        horizontalArrangement = Arrangement.spacedBy(8.dp),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        CompositionLocalProvider(
            LocalMarkerVariant provides variant,
            LocalContentStyle provides Typography.sm.copy(color = colors.labelSecondary),
            LocalContentColor provides colors.labelSecondary,
            LocalIconSize provides 16.dp,
        ) {
            if (variant == MarkerVariant.Separator) {
                MarkerLine(Modifier.padding(end = 4.dp))
            }
            content()
            if (variant == MarkerVariant.Separator) {
                MarkerLine(Modifier.padding(start = 4.dp))
            }
        }
    }
}

@Composable
fun Marker(
    text: String,
    modifier: Modifier = Modifier,
    variant: MarkerVariant = MarkerVariant.Default,
    icon: ImageVector? = null,
) {
    Marker(modifier, variant) {
        if (icon != null) MarkerIcon { Icon(icon, contentDescription = null) }
        MarkerContent(text)
    }
}

@Composable
private fun RowScope.MarkerLine(modifier: Modifier) {
    Box(
        modifier = Modifier
            .weight(1f)
            .then(modifier)
            .height(1.dp)
            .background(EsuissTheme.colors.separator),
    )
}

@Composable
fun MarkerIcon(
    modifier: Modifier = Modifier,
    content: @Composable BoxScope.() -> Unit,
) {
    Box(
        modifier = modifier.size(16.dp).clearAndSetSemantics {},
        contentAlignment = Alignment.Center,
    ) {
        CompositionLocalProvider(LocalIconSize provides 16.dp) {
            content()
        }
    }
}

@Composable
fun RowScope.MarkerContent(
    modifier: Modifier = Modifier,
    content: @Composable () -> Unit,
) {
    val separator = LocalMarkerVariant.current == MarkerVariant.Separator
    Box(
        modifier = if (separator) modifier else modifier.weight(1f, fill = false),
        contentAlignment = if (separator) Alignment.Center else Alignment.CenterStart,
    ) {
        content()
    }
}

@Composable
fun RowScope.MarkerContent(text: String, modifier: Modifier = Modifier) {
    val separator = LocalMarkerVariant.current == MarkerVariant.Separator
    MarkerContent(modifier) {
        BasicText(
            text,
            style = LocalContentStyle.current.copy(textAlign = if (separator) TextAlign.Center else TextAlign.Start),
        )
    }
}
```

```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),
    )
}
```

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

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

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

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

## Usage

```tsx
import { Marker, MarkerIcon, MarkerContent } from "@/components/ui/marker"
```

```tsx
<View className="gap-8">
  <Marker>
    <MarkerIcon>
      <Icon as={InfoIcon} />
    </MarkerIcon>
    <MarkerContent>Messages are end-to-end encrypted.</MarkerContent>
  </Marker>
  <Marker variant="separator">
    <MarkerContent>Today</MarkerContent>
  </Marker>
  <Marker variant="border">
    <MarkerIcon>
      <Icon as={CalendarBlankIcon} />
    </MarkerIcon>
    <MarkerContent>Upcoming</MarkerContent>
  </Marker>
</View>
```

Put the text in `MarkerContent` and an `Icon` in `MarkerIcon`. Text and icons inside the marker pick up the secondary label color and size through context.

Pass a `render` element to `Marker` to render it as another component instead of a `View`.

## API Reference

### Marker

Row that sets the variant and the text and icon styles.

### MarkerIcon

Fixed-size slot for an icon.

### MarkerContent

Marker text, centered in the `separator` variant.

## Accessibility

- `MarkerIcon` and the separator lines are hidden from screen readers, so only the text is read.
- If the icon carries meaning, include it in the text.

## Notes

- Text uses `text-sm text-label-secondary` and icons `size-4`.
- Lines and the bottom border use `bg-separator` and `border-separator`.
- Light and dark colors follow the system appearance.