# Input Group

An input or textarea combined with prefix and suffix addons such as text, icons and buttons.

Input Group 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/input-group

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

```tsx
import { CopyIcon, MagnifyingGlassIcon, XIcon } from "phosphor-react-native"
import * as React from "react"
import { View } from "react-native"
import { Icon } from "@/components/ui/icon"
import { InputGroup, InputGroupAddon, InputGroupButton, InputGroupInput, InputGroupText } from "@/components/ui/input-group"
import { Spinner } from "@/components/ui/spinner"

function SearchDemo() {
  const [value, setValue] = React.useState("")
  return (
    <InputGroup>
      <InputGroupInput
        placeholder="Search"
        value={value}
        onValueChange={setValue}
      />
      <InputGroupAddon>
        <Icon as={MagnifyingGlassIcon} />
      </InputGroupAddon>
      {value ? (
        <InputGroupAddon align="inline-end">
          <InputGroupButton
            size="icon-xs"
            accessibilityLabel="Clear"
            onPress={() => setValue("")}
          >
            <Icon as={XIcon} />
          </InputGroupButton>
        </InputGroupAddon>
      ) : null}
    </InputGroup>
  )
}

export function InputGroupExample() {
  return (
    <View className="gap-4">
      <SearchDemo />
      <InputGroup>
        <InputGroupAddon>
          <InputGroupText>https://</InputGroupText>
        </InputGroupAddon>
        <InputGroupInput placeholder="example.com" autoCapitalize="none" />
        <InputGroupAddon align="inline-end">
          <InputGroupText>.com</InputGroupText>
        </InputGroupAddon>
      </InputGroup>
      <InputGroup>
        <InputGroupInput defaultValue="sk_live_51H8" />
        <InputGroupAddon align="inline-end">
          <InputGroupButton size="icon-xs" accessibilityLabel="Copy">
            <Icon as={CopyIcon} />
          </InputGroupButton>
        </InputGroupAddon>
      </InputGroup>
      <InputGroup>
        <InputGroupInput placeholder="Searching..." />
        <InputGroupAddon align="inline-end">
          <Spinner />
        </InputGroupAddon>
      </InputGroup>
      <InputGroup invalid>
        <InputGroupInput defaultValue="not-an-email" />
        <InputGroupAddon align="inline-end">
          <InputGroupText>Invalid</InputGroupText>
        </InputGroupAddon>
      </InputGroup>
      <InputGroup disabled>
        <InputGroupInput placeholder="Disabled" />
        <InputGroupAddon>
          <Icon as={MagnifyingGlassIcon} />
        </InputGroupAddon>
      </InputGroup>
    </View>
  )
}
```

```swift
import EsuissUI
import PhosphorSwift
import SwiftUI

struct InputGroupIcon: View {
  let image: Image

  var body: some View {
    image.frame(width: 16, height: 16)
  }
}

struct InputGroupSearchDemo: View {
  @State private var value = ""

  var body: some View {
    InputGroup {
      InputGroupInput("Search", text: $value)
      InputGroupAddon {
        InputGroupIcon(image: Ph.magnifyingGlass.regular)
      }
      if !value.isEmpty {
        InputGroupAddon(align: .inlineEnd) {
          InputGroupButton(size: .iconXs) {
            value = ""
          } label: {
            InputGroupIcon(image: Ph.x.regular)
          }
          .accessibilityLabel(Text("Clear"))
        }
      }
    }
  }
}

struct InputGroupDefaultDemo: View {
  @State private var domain = ""
  @State private var key = "sk_live_51H8"
  @State private var searching = ""
  @State private var email = "not-an-email"
  @State private var disabled = ""

  var body: some View {
    VStack(alignment: .leading, spacing: 16) {
      InputGroupSearchDemo()
      InputGroup {
        InputGroupAddon {
          InputGroupText("https://")
        }
        InputGroupInput("example.com", text: $domain)
          .textInputAutocapitalization(.never)
        InputGroupAddon(align: .inlineEnd) {
          InputGroupText(".com")
        }
      }
      InputGroup {
        InputGroupInput("", text: $key)
        InputGroupAddon(align: .inlineEnd) {
          InputGroupButton(size: .iconXs) {} label: {
            InputGroupIcon(image: Ph.copy.regular)
          }
          .accessibilityLabel(Text("Copy"))
        }
      }
      InputGroup {
        InputGroupInput("Searching...", text: $searching)
        InputGroupAddon(align: .inlineEnd) {
          Spinner()
        }
      }
      InputGroup {
        InputGroupInput("", text: $email)
        InputGroupAddon(align: .inlineEnd) {
          InputGroupText("Invalid")
        }
      }
      .invalid()
      InputGroup {
        InputGroupInput("Disabled", text: $disabled)
        InputGroupAddon {
          InputGroupIcon(image: Ph.magnifyingGlass.regular)
        }
      }
      .disabled(true)
    }
  }
}
```

```kotlin
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.text.input.KeyboardCapitalization
import androidx.compose.ui.unit.dp
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.Copy
import com.adamglin.phosphoricons.regular.MagnifyingGlass
import com.adamglin.phosphoricons.regular.X
import com.esuiss.ui.components.Icon
import com.esuiss.ui.components.InputGroup
import com.esuiss.ui.components.InputGroupAddon
import com.esuiss.ui.components.InputGroupAddonAlign
import com.esuiss.ui.components.InputGroupButton
import com.esuiss.ui.components.InputGroupButtonSize
import com.esuiss.ui.components.InputGroupInput
import com.esuiss.ui.components.InputGroupText
import com.esuiss.ui.components.Spinner

@Composable
fun InputGroupSearch() {
    var value by rememberSaveable { mutableStateOf("") }
    InputGroup {
        InputGroupInput(value, { value = it }, placeholder = "Search")
        InputGroupAddon {
            Icon(PhosphorIcons.Regular.MagnifyingGlass, contentDescription = null)
        }
        if (value.isNotEmpty()) {
            InputGroupAddon(align = InputGroupAddonAlign.InlineEnd) {
                InputGroupButton(onClick = { value = "" }, size = InputGroupButtonSize.IconXs) {
                    Icon(PhosphorIcons.Regular.X, contentDescription = "Clear")
                }
            }
        }
    }
}

@Composable
fun InputGroupDefault() {
    var domain by rememberSaveable { mutableStateOf("") }
    var key by rememberSaveable { mutableStateOf("sk_live_51H8") }
    var searching by rememberSaveable { mutableStateOf("") }
    var email by rememberSaveable { mutableStateOf("not-an-email") }
    var disabled by rememberSaveable { mutableStateOf("") }
    Column(Modifier.fillMaxWidth(), verticalArrangement = Arrangement.spacedBy(16.dp)) {
        InputGroupSearch()
        InputGroup {
            InputGroupAddon { InputGroupText("https://") }
            InputGroupInput(
                domain,
                { domain = it },
                placeholder = "example.com",
                keyboardOptions = KeyboardOptions(capitalization = KeyboardCapitalization.None),
            )
            InputGroupAddon(align = InputGroupAddonAlign.InlineEnd) { InputGroupText(".com") }
        }
        InputGroup {
            InputGroupInput(key, { key = it })
            InputGroupAddon(align = InputGroupAddonAlign.InlineEnd) {
                InputGroupButton(onClick = {}, size = InputGroupButtonSize.IconXs) {
                    Icon(PhosphorIcons.Regular.Copy, contentDescription = "Copy")
                }
            }
        }
        InputGroup {
            InputGroupInput(searching, { searching = it }, placeholder = "Searching...")
            InputGroupAddon(align = InputGroupAddonAlign.InlineEnd) { Spinner() }
        }
        InputGroup(invalid = true) {
            InputGroupInput(email, { email = it })
            InputGroupAddon(align = InputGroupAddonAlign.InlineEnd) { InputGroupText("Invalid") }
        }
        InputGroup(enabled = false) {
            InputGroupInput(disabled, { disabled = it }, placeholder = "Disabled")
            InputGroupAddon {
                Icon(PhosphorIcons.Regular.MagnifyingGlass, contentDescription = null)
            }
        }
    }
}
```

`InputGroup` draws one control-colored field and places an `InputGroupInput` or `InputGroupTextarea` inside it with addons around. Addons can sit on the start or end of the same line (`inline-start`, `inline-end`), or above or below the input (`block-start`, `block-end`), which turns the group into a column.

The group shows the focus border while its input is focused, and reads the disabled and invalid state from a surrounding Field. Pressing an addon focuses the input.

## Installation

```bash title="Terminal"
npx @esuiss/uim@latest add input-group
```

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

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

The CLI also adds what it builds on: [Button](/docs/components/button), [Icon](/docs/components/icon), [Input](/docs/components/input), [Text](/docs/components/text), [Textarea](/docs/components/textarea).

### Manual

**Uniwind**

1. Install the dependencies:

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

2. Add the pieces it builds on: [Button](/docs/components/button), [Icon](/docs/components/icon), [Input](/docs/components/input), [Text](/docs/components/text), [Textarea](/docs/components/textarea), and the primitives `components/primitives/field.tsx`, `components/primitives/use-render.tsx`.

3. Copy the source into `components/ui/input-group.tsx`:

```tsx title="uniwind/components/ui/input-group.tsx"
import { cva, type VariantProps } from "class-variance-authority"
import { cn } from "cn"
import * as React from "react"
import { Pressable, type TextInput, View, type ViewProps } from "react-native"
import { useFieldRootContext } from "@/components/primitives/field"
import { resolveClassName } from "@/components/primitives/use-render"
import { Button } from "@/components/ui/button"
import { IconClassContext } from "@/components/ui/icon"
import { Input } from "@/components/ui/input"
import { Text, TextClassContext } from "@/components/ui/text"
import { Textarea } from "@/components/ui/textarea"

type InputGroupAlign =
  | "inline-start"
  | "inline-end"
  | "block-start"
  | "block-end"

type InputGroupContextProps = {
  block: boolean
  disabled: boolean
  inputRef: React.RefObject<TextInput | null>
  setFocused: (focused: boolean) => void
}

const InputGroupContext = React.createContext<InputGroupContextProps | null>(
  null
)

function useInputGroup() {
  const context = React.useContext(InputGroupContext)
  if (!context) {
    throw new Error("useInputGroup must be used within an <InputGroup />")
  }
  return context
}

const START: InputGroupAlign[] = ["inline-start", "block-start"]

function alignOf(node: React.ReactNode): InputGroupAlign | null {
  if (!React.isValidElement<{ align?: InputGroupAlign }>(node)) return null
  if (node.type !== InputGroupAddon) return null
  return node.props.align ?? "inline-start"
}

function InputGroup({
  className,
  children,
  disabled = false,
  invalid,
  ...props
}: ViewProps & { disabled?: boolean; invalid?: boolean }) {
  const field = useFieldRootContext()
  const inputRef = React.useRef<TextInput | null>(null)
  const [focused, setFocused] = React.useState(false)
  const isDisabled = disabled || field.state.disabled
  const isInvalid = invalid ?? field.state.invalid
  const nodes = React.Children.toArray(children)
  const aligns = nodes.map(alignOf)
  const block = aligns.some(
    (align) => align === "block-start" || align === "block-end"
  )
  const multiline = nodes.some(
    (node) => React.isValidElement(node) && node.type === InputGroupTextarea
  )
  const ordered = [
    ...nodes.filter((_, index) =>
      START.includes(aligns[index] as InputGroupAlign)
    ),
    ...nodes.filter((_, index) => aligns[index] === null),
    ...nodes.filter(
      (_, index) =>
        aligns[index] !== null &&
        !START.includes(aligns[index] as InputGroupAlign)
    ),
  ]
  const contextValue = React.useMemo(
    () => ({ block, disabled: isDisabled, inputRef, setFocused }),
    [block, isDisabled]
  )
  return (
    <InputGroupContext.Provider value={contextValue}>
      <View
        role="group"
        className={cn(
          "relative h-11 w-full min-w-0 flex-row items-center rounded-lg border border-transparent bg-control",
          (block || multiline) && "h-auto rounded-xl",
          block && "flex-col items-stretch",
          focused && "border-focus",
          isInvalid && "border-danger bg-danger/5 dark:bg-danger/10",
          isDisabled && "bg-control-disabled",
          className
        )}
        {...props}
      >
        {ordered}
      </View>
    </InputGroupContext.Provider>
  )
}

const inputGroupAddonVariants = cva(
  "flex-row items-center justify-center gap-2 py-2",
  {
    variants: {
      align: {
        "inline-start": "ps-3",
        "inline-end": "pe-3",
        "block-start": "w-full justify-start px-3 pt-3",
        "block-end": "w-full justify-start px-3 pb-3",
      },
    },
    defaultVariants: {
      align: "inline-start",
    },
  }
)

function InputGroupAddon({
  className,
  align = "inline-start",
  onPress,
  ...props
}: React.ComponentProps<typeof Pressable> &
  VariantProps<typeof inputGroupAddonVariants>) {
  const { disabled, inputRef } = useInputGroup()
  const color = disabled ? "text-label-quaternary" : "text-label-secondary"
  return (
    <TextClassContext.Provider value={cn("text-base", color)}>
      <IconClassContext.Provider value={cn("size-4", color)}>
        <Pressable
          accessible={false}
          className={cn(inputGroupAddonVariants({ align }), className)}
          onPress={(event) => {
            onPress?.(event)
            inputRef.current?.focus()
          }}
          {...props}
        />
      </IconClassContext.Provider>
    </TextClassContext.Provider>
  )
}

const BUTTON_SIZE = {
  xs: "xs",
  sm: "sm",
  "icon-xs": "icon-xs",
  "icon-sm": "icon-sm",
} as const

function InputGroupButton({
  className,
  variant = "ghost",
  size = "xs",
  ...props
}: Omit<React.ComponentProps<typeof Button>, "size"> & {
  size?: keyof typeof BUTTON_SIZE
}) {
  return (
    <Button
      variant={variant}
      size={BUTTON_SIZE[size]}
      className={cn("rounded-full", size === "xs" && "px-1.5", className)}
      {...props}
    />
  )
}

function InputGroupText({
  className,
  ...props
}: React.ComponentProps<typeof Text>) {
  return <Text className={className} {...props} />
}

function InputGroupInput({
  className,
  onFocus,
  onBlur,
  ref,
  ...props
}: React.ComponentProps<typeof Input>) {
  const { block, disabled, inputRef, setFocused } = useInputGroup()
  return (
    <Input
      {...props}
      ref={(node: TextInput | null) => {
        inputRef.current = node
        if (typeof ref === "function") ref(node)
        else if (ref) ref.current = node
      }}
      disabled={disabled || props.disabled}
      onFocus={(event) => {
        setFocused(true)
        onFocus?.(event)
      }}
      onBlur={(event) => {
        setFocused(false)
        onBlur?.(event)
      }}
      className={(state) =>
        cn(
          block ? "w-full" : "flex-1",
          "rounded-none border-0 bg-transparent",
          resolveClassName(className, state)
        )
      }
    />
  )
}

function InputGroupTextarea({
  className,
  onFocus,
  onBlur,
  ref,
  ...props
}: React.ComponentProps<typeof Textarea>) {
  const { disabled, inputRef, setFocused } = useInputGroup()
  return (
    <Textarea
      {...props}
      ref={(node: TextInput | null) => {
        inputRef.current = node
        if (typeof ref === "function") ref(node)
        else if (ref) ref.current = node
      }}
      disabled={disabled || props.disabled}
      onFocus={(event) => {
        setFocused(true)
        onFocus?.(event)
      }}
      onBlur={(event) => {
        setFocused(false)
        onBlur?.(event)
      }}
      className={(state) =>
        cn(
          "w-full flex-1 rounded-none border-0 bg-transparent py-2.5",
          resolveClassName(className, state)
        )
      }
    />
  )
}

export {
  InputGroup,
  InputGroupAddon,
  InputGroupButton,
  InputGroupInput,
  InputGroupText,
  InputGroupTextarea,
}
```

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: [Button](/docs/components/button), [Icon](/docs/components/icon), [Input](/docs/components/input), [Text](/docs/components/text), [Textarea](/docs/components/textarea), and the primitives `components/primitives/field.tsx`, `components/primitives/use-render.tsx`.

3. Copy the source into `components/ui/input-group.tsx`:

```tsx title="nativewind/components/ui/input-group.tsx"
import { cva, type VariantProps } from "class-variance-authority"
import { cn } from "cn"
import * as React from "react"
import { Pressable, type TextInput, View, type ViewProps } from "react-native"
import { useFieldRootContext } from "@/components/primitives/field"
import { resolveClassName } from "@/components/primitives/use-render"
import { Button } from "@/components/ui/button"
import { IconClassContext } from "@/components/ui/icon"
import { Input } from "@/components/ui/input"
import { Text, TextClassContext } from "@/components/ui/text"
import { Textarea } from "@/components/ui/textarea"

type InputGroupAlign =
  | "inline-start"
  | "inline-end"
  | "block-start"
  | "block-end"

type InputGroupContextProps = {
  block: boolean
  disabled: boolean
  inputRef: React.RefObject<TextInput | null>
  setFocused: (focused: boolean) => void
}

const InputGroupContext = React.createContext<InputGroupContextProps | null>(
  null
)

function useInputGroup() {
  const context = React.useContext(InputGroupContext)
  if (!context) {
    throw new Error("useInputGroup must be used within an <InputGroup />")
  }
  return context
}

const START: InputGroupAlign[] = ["inline-start", "block-start"]

function alignOf(node: React.ReactNode): InputGroupAlign | null {
  if (!React.isValidElement<{ align?: InputGroupAlign }>(node)) return null
  if (node.type !== InputGroupAddon) return null
  return node.props.align ?? "inline-start"
}

function InputGroup({
  className,
  children,
  disabled = false,
  invalid,
  ...props
}: ViewProps & { disabled?: boolean; invalid?: boolean }) {
  const field = useFieldRootContext()
  const inputRef = React.useRef<TextInput | null>(null)
  const [focused, setFocused] = React.useState(false)
  const isDisabled = disabled || field.state.disabled
  const isInvalid = invalid ?? field.state.invalid
  const nodes = React.Children.toArray(children)
  const aligns = nodes.map(alignOf)
  const block = aligns.some(
    (align) => align === "block-start" || align === "block-end"
  )
  const multiline = nodes.some(
    (node) => React.isValidElement(node) && node.type === InputGroupTextarea
  )
  const ordered = [
    ...nodes.filter((_, index) =>
      START.includes(aligns[index] as InputGroupAlign)
    ),
    ...nodes.filter((_, index) => aligns[index] === null),
    ...nodes.filter(
      (_, index) =>
        aligns[index] !== null &&
        !START.includes(aligns[index] as InputGroupAlign)
    ),
  ]
  const contextValue = React.useMemo(
    () => ({ block, disabled: isDisabled, inputRef, setFocused }),
    [block, isDisabled]
  )
  return (
    <InputGroupContext.Provider value={contextValue}>
      <View
        role="group"
        className={cn(
          "relative h-11 w-full min-w-0 flex-row items-center rounded-lg border border-transparent bg-control",
          (block || multiline) && "h-auto rounded-xl",
          block && "flex-col items-stretch",
          focused && "border-focus",
          isInvalid && "border-danger bg-danger-5 dark:bg-danger-10",
          isDisabled && "bg-control-disabled",
          className
        )}
        {...props}
      >
        {ordered}
      </View>
    </InputGroupContext.Provider>
  )
}

const inputGroupAddonVariants = cva(
  "flex-row items-center justify-center gap-2 py-2",
  {
    variants: {
      align: {
        "inline-start": "ps-3",
        "inline-end": "pe-3",
        "block-start": "w-full justify-start px-3 pt-3",
        "block-end": "w-full justify-start px-3 pb-3",
      },
    },
    defaultVariants: {
      align: "inline-start",
    },
  }
)

function InputGroupAddon({
  className,
  align = "inline-start",
  onPress,
  ...props
}: React.ComponentProps<typeof Pressable> &
  VariantProps<typeof inputGroupAddonVariants>) {
  const { disabled, inputRef } = useInputGroup()
  const color = disabled ? "text-label-quaternary" : "text-label-secondary"
  return (
    <TextClassContext.Provider value={cn("text-base", color)}>
      <IconClassContext.Provider value={cn("size-4", color)}>
        <Pressable
          accessible={false}
          className={cn(inputGroupAddonVariants({ align }), className)}
          onPress={(event) => {
            onPress?.(event)
            inputRef.current?.focus()
          }}
          {...props}
        />
      </IconClassContext.Provider>
    </TextClassContext.Provider>
  )
}

const BUTTON_SIZE = {
  xs: "xs",
  sm: "sm",
  "icon-xs": "icon-xs",
  "icon-sm": "icon-sm",
} as const

function InputGroupButton({
  className,
  variant = "ghost",
  size = "xs",
  ...props
}: Omit<React.ComponentProps<typeof Button>, "size"> & {
  size?: keyof typeof BUTTON_SIZE
}) {
  return (
    <Button
      variant={variant}
      size={BUTTON_SIZE[size]}
      className={cn("rounded-full", size === "xs" && "px-1.5", className)}
      {...props}
    />
  )
}

function InputGroupText({
  className,
  ...props
}: React.ComponentProps<typeof Text>) {
  return <Text className={className} {...props} />
}

function InputGroupInput({
  className,
  onFocus,
  onBlur,
  ref,
  ...props
}: React.ComponentProps<typeof Input>) {
  const { block, disabled, inputRef, setFocused } = useInputGroup()
  return (
    <Input
      {...props}
      ref={(node: TextInput | null) => {
        inputRef.current = node
        if (typeof ref === "function") ref(node)
        else if (ref) ref.current = node
      }}
      disabled={disabled || props.disabled}
      onFocus={(event) => {
        setFocused(true)
        onFocus?.(event)
      }}
      onBlur={(event) => {
        setFocused(false)
        onBlur?.(event)
      }}
      className={(state) =>
        cn(
          block ? "w-full" : "flex-1",
          "rounded-none border-0 bg-transparent",
          resolveClassName(className, state)
        )
      }
    />
  )
}

function InputGroupTextarea({
  className,
  onFocus,
  onBlur,
  ref,
  ...props
}: React.ComponentProps<typeof Textarea>) {
  const { disabled, inputRef, setFocused } = useInputGroup()
  return (
    <Textarea
      {...props}
      ref={(node: TextInput | null) => {
        inputRef.current = node
        if (typeof ref === "function") ref(node)
        else if (ref) ref.current = node
      }}
      disabled={disabled || props.disabled}
      onFocus={(event) => {
        setFocused(true)
        onFocus?.(event)
      }}
      onBlur={(event) => {
        setFocused(false)
        onBlur?.(event)
      }}
      className={(state) =>
        cn(
          "w-full flex-1 rounded-none border-0 bg-transparent py-2.5",
          resolveClassName(className, state)
        )
      }
    />
  )
}

export {
  InputGroup,
  InputGroupAddon,
  InputGroupButton,
  InputGroupInput,
  InputGroupText,
  InputGroupTextarea,
}
```

4. Update the import paths to match your project.

**StyleSheet**

1. Add the pieces it builds on: [Button](/docs/components/button), [Icon](/docs/components/icon), [Input](/docs/components/input), [Text](/docs/components/text), [Textarea](/docs/components/textarea), and the primitives `components/primitives/field.tsx`, `components/primitives/use-render.tsx`.

2. Copy the source into `components/ui/input-group.tsx`:

```tsx title="stylesheet/components/ui/input-group.tsx"
import * as React from "react"
import {
  Pressable,
  StyleSheet,
  type TextInput,
  View,
  type ViewProps,
} from "react-native"
import { useFieldRootContext } from "@/components/primitives/field"
import { Button, type ButtonSize } from "@/components/ui/button"
import { IconSizeContext } from "@/components/ui/icon"
import { Input } from "@/components/ui/input"
import { Text, TextStyleContext } from "@/components/ui/text"
import { Textarea } from "@/components/ui/textarea"
import { fontSize, radius, useTheme } from "@/components/ui/theme"

type InputGroupAlign =
  | "inline-start"
  | "inline-end"
  | "block-start"
  | "block-end"

type InputGroupContextProps = {
  block: boolean
  disabled: boolean
  inputRef: React.RefObject<TextInput | null>
  setFocused: (focused: boolean) => void
}

const InputGroupContext = React.createContext<InputGroupContextProps | null>(
  null
)

function useInputGroup() {
  const context = React.useContext(InputGroupContext)
  if (!context) {
    throw new Error("useInputGroup must be used within an <InputGroup />")
  }
  return context
}

const START: InputGroupAlign[] = ["inline-start", "block-start"]

const styles = StyleSheet.create({
  root: {
    position: "relative",
    height: 44,
    width: "100%",
    minWidth: 0,
    flexDirection: "row",
    alignItems: "center",
    borderRadius: radius.lg,
    borderWidth: 1,
    borderColor: "transparent",
  },
  auto: { height: "auto", borderRadius: radius.xl },
  block: { flexDirection: "column", alignItems: "stretch" },
  addon: {
    flexDirection: "row",
    alignItems: "center",
    justifyContent: "center",
    gap: 8,
    paddingVertical: 8,
  },
  "inline-start": { paddingStart: 12 },
  "inline-end": { paddingEnd: 12 },
  "block-start": {
    width: "100%",
    justifyContent: "flex-start",
    paddingHorizontal: 12,
    paddingTop: 12,
  },
  "block-end": {
    width: "100%",
    justifyContent: "flex-start",
    paddingHorizontal: 12,
    paddingBottom: 12,
  },
  control: {
    borderRadius: 0,
    borderWidth: 0,
    backgroundColor: "transparent",
  },
})

function withAlpha(color: string, alpha: number) {
  if (!color.startsWith("#") || color.length !== 7) return color
  const r = Number.parseInt(color.slice(1, 3), 16)
  const g = Number.parseInt(color.slice(3, 5), 16)
  const b = Number.parseInt(color.slice(5, 7), 16)
  return `rgba(${r}, ${g}, ${b}, ${alpha})`
}

function alignOf(node: React.ReactNode): InputGroupAlign | null {
  if (!React.isValidElement<{ align?: InputGroupAlign }>(node)) return null
  if (node.type !== InputGroupAddon) return null
  return node.props.align ?? "inline-start"
}

function InputGroup({
  style,
  children,
  disabled = false,
  invalid,
  ...props
}: ViewProps & { disabled?: boolean; invalid?: boolean }) {
  const { colors, isDark } = useTheme()
  const field = useFieldRootContext()
  const inputRef = React.useRef<TextInput | null>(null)
  const [focused, setFocused] = React.useState(false)
  const isDisabled = disabled || field.state.disabled
  const isInvalid = invalid ?? field.state.invalid
  const nodes = React.Children.toArray(children)
  const aligns = nodes.map(alignOf)
  const block = aligns.some(
    (align) => align === "block-start" || align === "block-end"
  )
  const multiline = nodes.some(
    (node) => React.isValidElement(node) && node.type === InputGroupTextarea
  )
  const ordered = [
    ...nodes.filter((_, index) =>
      START.includes(aligns[index] as InputGroupAlign)
    ),
    ...nodes.filter((_, index) => aligns[index] === null),
    ...nodes.filter(
      (_, index) =>
        aligns[index] !== null &&
        !START.includes(aligns[index] as InputGroupAlign)
    ),
  ]
  const contextValue = React.useMemo(
    () => ({ block, disabled: isDisabled, inputRef, setFocused }),
    [block, isDisabled]
  )
  return (
    <InputGroupContext.Provider value={contextValue}>
      <View
        role="group"
        style={[
          styles.root,
          { backgroundColor: colors.control },
          (block || multiline) && styles.auto,
          block && styles.block,
          focused && { borderColor: colors.focus },
          isInvalid && {
            borderColor: colors.danger,
            backgroundColor: withAlpha(colors.danger, isDark ? 0.1 : 0.05),
          },
          isDisabled && { backgroundColor: colors.controlDisabled },
          style,
        ]}
        {...props}
      >
        {ordered}
      </View>
    </InputGroupContext.Provider>
  )
}

function InputGroupAddon({
  style,
  align = "inline-start",
  onPress,
  ...props
}: React.ComponentProps<typeof Pressable> & { align?: InputGroupAlign }) {
  const { colors } = useTheme()
  const { disabled, inputRef } = useInputGroup()
  const color = disabled ? colors.labelQuaternary : colors.labelSecondary
  return (
    <TextStyleContext.Provider value={{ ...fontSize.base, color }}>
      <IconSizeContext.Provider value={16}>
        <Pressable
          accessible={false}
          style={(state) => [
            styles.addon,
            styles[align],
            typeof style === "function" ? style(state) : style,
          ]}
          onPress={(event) => {
            onPress?.(event)
            inputRef.current?.focus()
          }}
          {...props}
        />
      </IconSizeContext.Provider>
    </TextStyleContext.Provider>
  )
}

const BUTTON_SIZE = {
  xs: "xs",
  sm: "sm",
  "icon-xs": "icon-xs",
  "icon-sm": "icon-sm",
} as const satisfies Record<string, ButtonSize>

function InputGroupButton({
  style,
  variant = "ghost",
  size = "xs",
  ...props
}: Omit<React.ComponentProps<typeof Button>, "size"> & {
  size?: keyof typeof BUTTON_SIZE
}) {
  return (
    <Button
      variant={variant}
      size={BUTTON_SIZE[size]}
      style={(state) => [
        { borderRadius: radius.full },
        size === "xs" && { paddingHorizontal: 6 },
        typeof style === "function" ? style(state) : style,
      ]}
      {...props}
    />
  )
}

function InputGroupText(props: React.ComponentProps<typeof Text>) {
  return <Text {...props} />
}

type FocusHandler = NonNullable<React.ComponentProps<typeof Input>["onFocus"]>

type BlurHandler = NonNullable<React.ComponentProps<typeof Input>["onBlur"]>

function useControl(
  ref: React.Ref<TextInput> | undefined,
  onFocus: FocusHandler | undefined,
  onBlur: BlurHandler | undefined
) {
  const { block, disabled, inputRef, setFocused } = useInputGroup()
  return {
    block,
    disabled,
    ref: (node: TextInput | null) => {
      inputRef.current = node
      if (typeof ref === "function") ref(node)
      else if (ref) ref.current = node
    },
    onFocus: (event: Parameters<FocusHandler>[0]) => {
      setFocused(true)
      onFocus?.(event)
    },
    onBlur: (event: Parameters<BlurHandler>[0]) => {
      setFocused(false)
      onBlur?.(event)
    },
  }
}

function InputGroupInput({
  style,
  onFocus,
  onBlur,
  ref,
  ...props
}: React.ComponentProps<typeof Input>) {
  const control = useControl(ref, onFocus, onBlur)
  return (
    <Input
      {...props}
      ref={control.ref}
      disabled={control.disabled || props.disabled}
      onFocus={control.onFocus}
      onBlur={control.onBlur}
      style={(state) => [
        styles.control,
        control.block ? { width: "100%" } : { flex: 1 },
        typeof style === "function" ? style(state) : style,
      ]}
    />
  )
}

function InputGroupTextarea({
  style,
  onFocus,
  onBlur,
  ref,
  ...props
}: React.ComponentProps<typeof Textarea>) {
  const control = useControl(ref, onFocus, onBlur)
  return (
    <Textarea
      {...props}
      ref={control.ref}
      disabled={control.disabled || props.disabled}
      onFocus={control.onFocus}
      onBlur={control.onBlur}
      style={(state) => [
        styles.control,
        { width: "100%", flex: 1, paddingVertical: 10 },
        typeof style === "function" ? style(state) : style,
      ]}
    />
  )
}

export {
  InputGroup,
  InputGroupAddon,
  InputGroupButton,
  InputGroupInput,
  InputGroupText,
  InputGroupTextarea,
}
```

3. Update the import paths to match your project.

**SwiftUI**

1. Target iOS 17 or later.

2. Add the Swift package to your app:

```swift title="Package.swift"
.package(url: "https://github.com/phosphor-icons/swift", from: "2.1.0")
```

3. Copy the theme files every view uses:

```swift title="swift/Theme/Theme.swift"
import SwiftUI
import UIKit

struct RGBA: Sendable {
  let red: CGFloat
  let green: CGFloat
  let blue: CGFloat
  let alpha: CGFloat

  init(_ hex: UInt32, _ alpha: CGFloat = 1) {
    red = CGFloat((hex >> 16) & 0xFF) / 255
    green = CGFloat((hex >> 8) & 0xFF) / 255
    blue = CGFloat(hex & 0xFF) / 255
    self.alpha = alpha
  }

  var uiColor: UIColor {
    UIColor(red: red, green: green, blue: blue, alpha: alpha)
  }
}

extension Color {
  static func adaptive(light: RGBA, dark: RGBA) -> Color {
    let lightColor = light.uiColor
    let darkColor = dark.uiColor
    return Color(uiColor: UIColor { traits in
      traits.userInterfaceStyle == .dark ? darkColor : lightColor
    })
  }
}

public struct TextStyle: Sendable, Hashable {
  public let size: CGFloat
  public let lineHeight: CGFloat
  public let letterSpacing: CGFloat

  public init(size: CGFloat, lineHeight: CGFloat, letterSpacing: CGFloat) {
    self.size = size
    self.lineHeight = lineHeight
    self.letterSpacing = letterSpacing
  }

  public func font(weight: Font.Weight = .regular) -> Font {
    .system(size: size, weight: weight)
  }

  public var lineSpacing: CGFloat {
    max(0, lineHeight - UIFont.systemFont(ofSize: size).lineHeight)
  }
}

extension Hashable where Self == Font {
  public static func textStyle(_ style: TextStyle, weight: Font.Weight = .regular) -> Font {
    style.font(weight: weight)
  }
}

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

  func body(content: Content) -> some View {
    content
      .font(style.font(weight: weight))
      .tracking(style.letterSpacing)
      .lineSpacing(style.lineSpacing)
      .padding(.vertical, style.lineSpacing / 2)
  }
}

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

public struct Shadow: Sendable, Hashable {
  public let color: Color
  public let radius: CGFloat
  public let x: CGFloat
  public let y: CGFloat

  public init(color: Color, radius: CGFloat, x: CGFloat = 0, y: CGFloat = 0) {
    self.color = color
    self.radius = radius
    self.x = x
    self.y = y
  }
}

extension View {
  public func shadow(_ shadow: Shadow) -> some View {
    self.shadow(color: shadow.color, radius: shadow.radius, x: shadow.x, y: shadow.y)
  }
}
```

```swift title="swift/Theme/Tokens.swift"
import SwiftUI

extension Color {
  public static let surface = Color.adaptive(light: .init(0xFFFFFF), dark: .init(0x000000))
  public static let surfaceSecondary = Color.adaptive(light: .init(0xF5F5F7), dark: .init(0x161617))
  public static let surfaceTertiary = Color.adaptive(light: .init(0xE8E8ED), dark: .init(0x2C2C2E))
  public static let surfaceRaised = Color.adaptive(light: .init(0xFFFFFF), dark: .init(0x1D1D1F))
  public static let label = Color.adaptive(light: .init(0x1D1D1F), dark: .init(0xF5F5F7))
  public static let labelSecondary = Color.adaptive(light: .init(0x6E6E73), dark: .init(0xA1A1A6))
  public static let labelTertiary = Color.adaptive(light: .init(0x86868B), dark: .init(0x86868B))
  public static let labelQuaternary = Color.adaptive(light: .init(0xD2D2D7), dark: .init(0x424245))
  public static let control = Color.adaptive(light: .init(0x000000, 0.04), dark: .init(0xFFFFFF, 0.1))
  public static let controlPressed = Color.adaptive(light: .init(0x000000, 0.12), dark: .init(0xFFFFFF, 0.22))
  public static let controlSelected = Color.adaptive(light: .init(0x1D1D1F), dark: .init(0xF5F5F7))
  public static let controlDisabled = Color.adaptive(light: .init(0x000000, 0.03), dark: .init(0xFFFFFF, 0.05))
  public static let onControlSelected = Color.adaptive(light: .init(0xFFFFFF), dark: .init(0x000000))
  public static let itemPressed = Color.adaptive(light: .init(0x000000, 0.08), dark: .init(0xFFFFFF, 0.12))
  public static let itemSelected = Color.adaptive(light: .init(0x000000, 0.06), dark: .init(0xFFFFFF, 0.1))
  public static let separator = Color.adaptive(light: .init(0xD2D2D7), dark: .init(0x424245))
  public static let separatorStrong = Color.adaptive(light: .init(0x86868B), dark: .init(0x6E6E73))
  public static let accent = Color.adaptive(light: .init(0x0071E3), dark: .init(0x0071E3))
  public static let accentPressed = Color.adaptive(light: .init(0x005BB8), dark: .init(0x004D9E))
  public static let accentSelected = Color.adaptive(light: .init(0x0071E3), dark: .init(0x0071E3))
  public static let accentDisabled = Color.adaptive(light: .init(0x0071E3, 0.4), dark: .init(0x0071E3, 0.4))
  public static let onAccent = Color.adaptive(light: .init(0xFFFFFF), dark: .init(0xFFFFFF))
  public static let accentSurface = Color.adaptive(light: .init(0x0071E3, 0.09), dark: .init(0x0071E3, 0.18))
  public static let accentSurfacePressed = Color.adaptive(light: .init(0x0071E3, 0.18), dark: .init(0x0071E3, 0.3))
  public static let link = Color.adaptive(light: .init(0x0066CC), dark: .init(0x2997FF))
  public static let focus = Color.adaptive(light: .init(0x0071E3), dark: .init(0x0071E3))
  public static let scrim = Color.adaptive(light: .init(0x000000, 0.48), dark: .init(0x000000, 0.48))
  public static let media = Color.adaptive(light: .init(0x000000), dark: .init(0x000000))
  public static let onMedia = Color.adaptive(light: .init(0xFFFFFF), dark: .init(0xFFFFFF))
  public static let danger = Color.adaptive(light: .init(0xD0000A), dark: .init(0xFF5447))
  public static let dangerSurface = Color.adaptive(light: .init(0xD70015, 0.08), dark: .init(0xFF453A, 0.2))
  public static let dangerSurfacePressed = Color.adaptive(light: .init(0xD70015, 0.16), dark: .init(0xFF453A, 0.36))
  public static let success = Color.adaptive(light: .init(0x008009), dark: .init(0x30D158))
  public static let successSurface = Color.adaptive(light: .init(0xEFFAF1), dark: .init(0x30D158, 0.16))
  public static let warning = Color.adaptive(light: .init(0xB64400), dark: .init(0xFF9F0A))
  public static let warningSurface = Color.adaptive(light: .init(0xFFF5EA), dark: .init(0xFF9F0A, 0.16))
}

public enum Radius {
  public static let xs: CGFloat = 3
  public static let sm: CGFloat = 5
  public static let md: CGFloat = 8
  public static let lg: CGFloat = 10
  public static let xl: CGFloat = 12
  public static let xl2: CGFloat = 18
  public static let xl3: CGFloat = 28
  public static let full: CGFloat = 9999
}

extension TextStyle {
  public static let xs3 = TextStyle(size: 11, lineHeight: 13, letterSpacing: 0.066)
  public static let xs2 = TextStyle(size: 12, lineHeight: 16, letterSpacing: 0)
  public static let xs = TextStyle(size: 13, lineHeight: 18, letterSpacing: -0.078)
  public static let sm = TextStyle(size: 15, lineHeight: 20, letterSpacing: -0.24)
  public static let md = TextStyle(size: 16, lineHeight: 21, letterSpacing: -0.32)
  public static let base = TextStyle(size: 17, lineHeight: 22, letterSpacing: -0.442)
  public static let lg = TextStyle(size: 20, lineHeight: 25, letterSpacing: -0.46)
  public static let xl = TextStyle(size: 22, lineHeight: 28, letterSpacing: -0.264)
  public static let xl2 = TextStyle(size: 28, lineHeight: 34, letterSpacing: 0.392)
  public static let xl3 = TextStyle(size: 34, lineHeight: 41, letterSpacing: 0.408)

  public static let allCases: [TextStyle] = [.xs3, .xs2, .xs, .sm, .md, .base, .lg, .xl, .xl2, .xl3]
}

extension Shadow {
  public static let md = Shadow(color: .black.opacity(0.08), radius: 6, x: 2, y: 4)
  public static let lg = Shadow(color: .black.opacity(0.12), radius: 12, y: 4)
}
```

4. Copy the source and every file it uses:

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

public enum InputGroupAddonAlign: CaseIterable, Sendable, Hashable {
  case inlineStart, inlineEnd, blockStart, blockEnd

  var isBlock: Bool {
    self == .blockStart || self == .blockEnd
  }
}

struct InputGroupContext: Sendable {
  var focusRequest = 0
  var addons: Set<InputGroupAddonAlign> = []
  var requestFocus: @MainActor @Sendable () -> Void = {}
}

extension EnvironmentValues {
  @Entry var inputGroup: InputGroupContext? = nil
}

struct InputGroupAddonsKey: PreferenceKey {
  static var defaultValue: Set<InputGroupAddonAlign> { [] }

  static func reduce(value: inout Set<InputGroupAddonAlign>, nextValue: () -> Set<InputGroupAddonAlign>) {
    value.formUnion(nextValue())
  }
}

struct InputGroupFocusedKey: PreferenceKey {
  static var defaultValue: Bool { false }

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

struct InputGroupMultilineKey: PreferenceKey {
  static var defaultValue: Bool { false }

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

struct InputGroupButtonKey: PreferenceKey {
  static var defaultValue: Bool { false }

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

enum InputGroupSlot: Sendable, Equatable {
  case control
  case addon(InputGroupAddonAlign)
}

struct InputGroupSlotKey: LayoutValueKey {
  static let defaultValue = InputGroupSlot.control
}

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

  @State private var focusRequest = 0
  @State private var addons: Set<InputGroupAddonAlign> = []
  @State private var focused = false
  @State private var multiline = false
  @Environment(\.isEnabled) private var isEnabled
  @Environment(\.isInvalid) private var invalid
  @Environment(\.colorScheme) private var colorScheme

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

  public var body: some View {
    let request = $focusRequest
    let rounded = multiline || addons.contains(.blockStart) || addons.contains(.blockEnd)
    ButtonGroupItem(radius: rounded ? Radius.xl : Radius.lg) { shape in
      InputGroupLayout {
        content
      }
      .frame(maxWidth: .infinity, minHeight: 44)
      .environment(
        \.inputGroup,
        InputGroupContext(
          focusRequest: focusRequest,
          addons: addons,
          requestFocus: { request.wrappedValue += 1 }
        )
      )
      .onPreferenceChange(InputGroupAddonsKey.self) { addons = $0 }
      .onPreferenceChange(InputGroupFocusedKey.self) { focused = $0 }
      .onPreferenceChange(InputGroupMultilineKey.self) { multiline = $0 }
      .background(background, in: shape)
      .overlay {
        shape.strokeBorder(border, lineWidth: 1)
      }
      .contentShape(shape)
    }
    .accessibilityElement(children: .contain)
  }

  private var background: Color {
    if !isEnabled { return .controlDisabled }
    if invalid { return .danger.opacity(colorScheme == .dark ? 0.1 : 0.05) }
    return .control
  }

  private var border: Color {
    if invalid { return .danger }
    return focused ? .focus : .clear
  }
}

struct InputGroupLayout: Layout {
  private struct Rows {
    var top: [Int] = []
    var leading: [Int] = []
    var controls: [Int] = []
    var trailing: [Int] = []
    var bottom: [Int] = []
  }

  private func rows(_ subviews: Subviews) -> Rows {
    var rows = Rows()
    for index in subviews.indices {
      switch subviews[index][InputGroupSlotKey.self] {
      case .control: rows.controls.append(index)
      case .addon(.inlineStart): rows.leading.append(index)
      case .addon(.inlineEnd): rows.trailing.append(index)
      case .addon(.blockStart): rows.top.append(index)
      case .addon(.blockEnd): rows.bottom.append(index)
      }
    }
    return rows
  }

  private func middle(_ rows: Rows, subviews: Subviews, width: CGFloat?) -> [(Int, CGFloat)] {
    let fixed = (rows.leading + rows.trailing).map { ($0, subviews[$0].sizeThatFits(.unspecified).width) }
    let used = fixed.reduce(0) { $0 + $1.1 }
    let share: CGFloat
    if let width, !rows.controls.isEmpty {
      share = max(width - used, 0) / CGFloat(rows.controls.count)
    } else {
      share = 0
    }
    let widths = Dictionary(uniqueKeysWithValues: fixed)
    let ordered = rows.leading + rows.controls + rows.trailing
    return ordered.map { index in
      if let fixedWidth = widths[index] { return (index, fixedWidth) }
      return (index, width == nil ? subviews[index].sizeThatFits(.unspecified).width : share)
    }
  }

  func sizeThatFits(proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) -> CGSize {
    let rows = rows(subviews)
    let width = proposal.width
    var height: CGFloat = 0
    var widest: CGFloat = 0
    for index in rows.top + rows.bottom {
      let size = subviews[index].sizeThatFits(ProposedViewSize(width: width, height: nil))
      height += size.height
      widest = max(widest, size.width)
    }
    let line = middle(rows, subviews: subviews, width: width)
    var lineHeight: CGFloat = 0
    var lineWidth: CGFloat = 0
    for (index, itemWidth) in line {
      lineHeight = max(lineHeight, subviews[index].sizeThatFits(ProposedViewSize(width: itemWidth, height: nil)).height)
      lineWidth += itemWidth
    }
    height += lineHeight
    return CGSize(width: width ?? max(widest, lineWidth), height: height)
  }

  func placeSubviews(in bounds: CGRect, proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) {
    let rows = rows(subviews)
    var y = bounds.minY
    for index in rows.top {
      let size = subviews[index].sizeThatFits(ProposedViewSize(width: bounds.width, height: nil))
      subviews[index].place(at: CGPoint(x: bounds.minX, y: y), anchor: .topLeading, proposal: ProposedViewSize(width: bounds.width, height: size.height))
      y += size.height
    }
    var bottomHeight: CGFloat = 0
    for index in rows.bottom {
      bottomHeight += subviews[index].sizeThatFits(ProposedViewSize(width: bounds.width, height: nil)).height
    }
    let line = middle(rows, subviews: subviews, width: bounds.width)
    let lineHeight = max(bounds.maxY - bottomHeight - y, 0)
    var x = bounds.minX
    for (index, width) in line {
      let height = subviews[index].sizeThatFits(ProposedViewSize(width: width, height: nil)).height
      let control = subviews[index][InputGroupSlotKey.self] == .control
      let placed = control ? max(height, lineHeight) : height
      subviews[index].place(
        at: CGPoint(x: x, y: y + (lineHeight - placed) / 2),
        anchor: .topLeading,
        proposal: ProposedViewSize(width: width, height: placed)
      )
      x += width
    }
    y += lineHeight
    for index in rows.bottom {
      let size = subviews[index].sizeThatFits(ProposedViewSize(width: bounds.width, height: nil))
      subviews[index].place(at: CGPoint(x: bounds.minX, y: y), anchor: .topLeading, proposal: ProposedViewSize(width: bounds.width, height: size.height))
      y += size.height
    }
  }
}

public struct InputGroupAddon<Content: View>: View {
  let align: InputGroupAddonAlign
  let content: Content

  @State private var hasButton = false
  @Environment(\.inputGroup) private var group
  @Environment(\.isEnabled) private var isEnabled

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

  public var body: some View {
    HStack(spacing: 8) {
      content
    }
    .labelStyle(ButtonLabelStyle(spacing: 8, iconSize: 16))
    .scaledFont(.base)
    .foregroundStyle(isEnabled ? Color.labelSecondary : .labelQuaternary)
    .lineLimit(1)
    .padding(.vertical, align.isBlock ? 0 : 8)
    .padding(.top, align == .blockStart ? 12 : 0)
    .padding(.bottom, align == .blockEnd ? 12 : 0)
    .padding(.leading, leading)
    .padding(.trailing, trailing)
    .frame(maxWidth: align.isBlock ? .infinity : nil, alignment: .leading)
    .contentShape(Rectangle())
    .onTapGesture { group?.requestFocus() }
    .onPreferenceChange(InputGroupButtonKey.self) { hasButton = $0 }
    .transformPreference(InputGroupButtonKey.self) { $0 = false }
    .preference(key: InputGroupAddonsKey.self, value: [align])
    .layoutValue(key: InputGroupSlotKey.self, value: .addon(align))
  }

  private var leading: CGFloat {
    switch align {
    case .inlineStart: hasButton ? 8 : 12
    case .inlineEnd: 0
    case .blockStart, .blockEnd: 12
    }
  }

  private var trailing: CGFloat {
    switch align {
    case .inlineEnd: hasButton ? 8 : 12
    case .inlineStart: 0
    case .blockStart, .blockEnd: 12
    }
  }
}

public enum InputGroupButtonSize: CaseIterable, Sendable {
  case xs, sm, iconXs, iconSm
}

public struct InputGroupButton<Label: View>: View {
  public typealias Size = InputGroupButtonSize

  let variant: VariantButtonStyle.Variant
  let size: Size
  let action: () -> Void
  let label: Label

  public init(
    variant: VariantButtonStyle.Variant = .ghost,
    size: Size = .xs,
    action: @escaping () -> Void,
    @ViewBuilder label: () -> Label
  ) {
    self.variant = variant
    self.size = size
    self.action = action
    self.label = label()
  }

  public var body: some View {
    Button(action: action) {
      label
    }
    .buttonStyle(style)
    .preference(key: InputGroupButtonKey.self, value: true)
  }

  private var style: VariantButtonStyle {
    switch size {
    case .xs:
      VariantButtonStyle(variant, size: .xs, metrics: ButtonMetrics(horizontalPadding: 6, spacing: 4, iconSize: 14, textStyle: .sm))
    case .sm:
      VariantButtonStyle(variant, size: .sm)
    case .iconXs:
      VariantButtonStyle(variant, size: .iconXs, metrics: ButtonMetrics(horizontalPadding: 0, spacing: 4, iconSize: 14, textStyle: .sm))
    case .iconSm:
      VariantButtonStyle(variant, size: .iconSm)
    }
  }
}

extension InputGroupButton where Label == Text {
  public init(
    _ title: LocalizedStringKey,
    variant: VariantButtonStyle.Variant = .ghost,
    size: Size = .xs,
    action: @escaping () -> Void
  ) {
    self.init(variant: variant, size: size, action: action) { Text(title) }
  }
}

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

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

  public var body: some View {
    HStack(spacing: 8) {
      content
    }
    .labelStyle(ButtonLabelStyle(spacing: 8, iconSize: 16))
    .scaledFont(.base)
    .foregroundStyle(Color.labelSecondary)
  }
}

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

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

public struct InputGroupInput: View {
  let title: LocalizedStringKey
  let text: Binding<String>

  @Environment(\.inputGroup) private var group
  @Environment(\.isEnabled) private var isEnabled

  public init(_ title: LocalizedStringKey, text: Binding<String>) {
    self.title = title
    self.text = text
  }

  public var body: some View {
    let addons = group?.addons ?? []
    TextField(title, text: text)
      .textFieldStyle(.plain)
      .scaledFont(.base)
      .foregroundStyle(isEnabled ? Color.label : .labelQuaternary)
      .tint(Color.accent)
      .padding(.leading, addons.contains(.inlineStart) ? 6 : 12)
      .padding(.trailing, addons.contains(.inlineEnd) ? 6 : 12)
      .frame(maxWidth: .infinity, minHeight: 44)
      .modifier(InputGroupFocus(request: group?.focusRequest ?? 0))
      .layoutValue(key: InputGroupSlotKey.self, value: .control)
  }
}

public struct InputGroupTextarea: View {
  let title: LocalizedStringKey
  let text: Binding<String>
  let lineLimit: ClosedRange<Int>

  @Environment(\.inputGroup) private var group
  @Environment(\.isEnabled) private var isEnabled

  public init(_ title: LocalizedStringKey, text: Binding<String>, lineLimit: ClosedRange<Int> = 2...8) {
    self.title = title
    self.text = text
    self.lineLimit = lineLimit
  }

  public var body: some View {
    TextField(title, text: text, axis: .vertical)
      .textFieldStyle(.plain)
      .lineLimit(lineLimit)
      .scaledFont(.base)
      .foregroundStyle(isEnabled ? Color.label : .labelQuaternary)
      .tint(Color.accent)
      .padding(.horizontal, 12)
      .padding(.vertical, 10)
      .frame(maxWidth: .infinity, alignment: .topLeading)
      .modifier(InputGroupFocus(request: group?.focusRequest ?? 0))
      .preference(key: InputGroupMultilineKey.self, value: true)
      .layoutValue(key: InputGroupSlotKey.self, value: .control)
  }
}

struct InputGroupFocus: ViewModifier {
  let request: Int

  @FocusState private var focused: Bool

  func body(content: Content) -> some View {
    content
      .focused($focused)
      .contentShape(Rectangle())
      .onTapGesture { focused = true }
      .onChange(of: request) { focused = true }
      .preference(key: InputGroupFocusedKey.self, value: focused)
  }
}
```

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

public struct VariantButtonStyle: ButtonStyle {
  public enum Variant: CaseIterable, Sendable {
    case `default`, outline, secondary, tinted, ghost, plain, destructive, link
  }

  public enum Size: CaseIterable, Sendable {
    case `default`, xs, sm, lg, xl, icon, iconXs, iconSm, iconLg, iconXl

    var height: CGFloat {
      switch self {
      case .xs, .iconXs: 24
      case .sm, .iconSm: 32
      case .default, .icon: 36
      case .lg, .iconLg: 44
      case .xl, .iconXl: 56
      }
    }

    var horizontalPadding: CGFloat {
      switch self {
      case .xs: 11
      case .sm: 12
      case .default: 16
      case .lg: 22
      case .xl: 31
      case .icon, .iconXs, .iconSm, .iconLg, .iconXl: 0
      }
    }

    var spacing: CGFloat {
      switch self {
      case .xs, .sm, .iconXs, .iconSm: 4
      case .xl, .iconXl: 8
      default: 6
      }
    }

    var textStyle: TextStyle {
      switch self {
      case .xs, .iconXs: .xs2
      case .lg, .xl: .base
      default: .sm
      }
    }

    public var iconSize: CGFloat {
      switch self {
      case .xs, .iconXs: 12
      default: 16
      }
    }

    var blockRadius: CGFloat {
      switch self {
      case .xs, .iconXs: Radius.sm
      case .lg, .iconLg: Radius.lg
      case .xl, .iconXl: Radius.xl
      default: Radius.md
      }
    }

    var isIcon: Bool {
      switch self {
      case .icon, .iconXs, .iconSm, .iconLg, .iconXl: true
      default: false
      }
    }
  }

  let variant: Variant
  let size: Size
  let block: Bool
  var metrics: ButtonMetrics?

  public init(_ variant: Variant = .default, size: Size = .default, block: Bool = false) {
    self.variant = variant
    self.size = size
    self.block = block
  }

  init(_ variant: Variant, size: Size, metrics: ButtonMetrics) {
    self.variant = variant
    self.size = size
    self.block = false
    self.metrics = metrics
  }

  public func makeBody(configuration: Configuration) -> some View {
    StyledButton(configuration: configuration, variant: variant, size: size, block: block, metrics: metrics)
  }
}

struct ButtonMetrics: Sendable {
  var horizontalPadding: CGFloat
  var spacing: CGFloat
  var iconSize: CGFloat
  var textStyle: TextStyle
}

private struct StyledButton: View {
  let configuration: ButtonStyleConfiguration
  let variant: VariantButtonStyle.Variant
  let size: VariantButtonStyle.Size
  let block: Bool
  let metrics: ButtonMetrics?

  @Environment(\.colorScheme) private var colorScheme
  @Environment(\.isEnabled) private var isEnabled
  @Environment(\.buttonGroup) private var group

  var body: some View {
    let joined = group != nil && variant != .ghost && variant != .plain
    let rounded = RoundedRectangle(
      cornerRadius: block ? size.blockRadius : Radius.full,
      style: .continuous
    )
    let shape = joined ? AnyShape(Rectangle()) : AnyShape(rounded)
    configuration.label
      .labelStyle(ButtonLabelStyle(spacing: metrics?.spacing ?? size.spacing, iconSize: metrics?.iconSize ?? size.iconSize))
    .font((metrics?.textStyle ?? size.textStyle).font())
    .tracking((metrics?.textStyle ?? size.textStyle).letterSpacing)
    .underline(variant == .link && pressed && isEnabled)
    .lineLimit(1)
    .foregroundStyle(foreground)
    .padding(.horizontal, metrics?.horizontalPadding ?? size.horizontalPadding)
    .frame(width: size.isIcon && !block ? size.height : nil, height: size.height)
    .frame(maxWidth: block || group == .vertical ? .infinity : nil)
    .background(background, in: shape)
    .overlay {
      if variant == .outline && !joined {
        rounded.strokeBorder(Color.separator)
      }
    }
    .contentShape(shape)
    .anchorPreference(key: ButtonGroupFramesKey.self, value: .bounds) { anchor in
      joined ? [ButtonGroupFrame(bounds: anchor, outlined: variant == .outline)] : []
    }
  }

  private var isDark: Bool { colorScheme == .dark }
  private var pressed: Bool { configuration.isPressed }

  private var foreground: Color {
    switch variant {
    case .default:
      .onAccent
    case .outline, .secondary, .ghost:
      isEnabled ? .label : .labelQuaternary
    case .tinted, .plain:
      isEnabled ? .link : .link.opacity(0.4)
    case .destructive:
      isEnabled ? .danger : .danger.opacity(0.4)
    case .link:
      isEnabled ? .link : .labelQuaternary
    }
  }

  private var background: Color {
    switch variant {
    case .default:
      !isEnabled ? .accentDisabled : pressed ? .accentPressed : .accent
    case .outline:
      isEnabled && pressed ? .itemPressed : isDark ? .clear : .surface
    case .secondary:
      !isEnabled ? .controlDisabled : pressed ? .controlPressed : .control
    case .tinted:
      isEnabled && pressed ? .accentSurfacePressed : .accentSurface
    case .ghost:
      isEnabled && pressed ? .itemPressed : .clear
    case .plain:
      isEnabled && pressed ? .itemPressed : .clear
    case .destructive:
      isEnabled && pressed ? .dangerSurfacePressed : .dangerSurface
    case .link:
      .clear
    }
  }
}

struct ButtonLabelStyle: LabelStyle {
  let spacing: CGFloat
  let iconSize: CGFloat

  func makeBody(configuration: Configuration) -> some View {
    HStack(spacing: spacing) {
      configuration.icon
        .frame(width: iconSize, height: iconSize)
      configuration.title
    }
  }
}

extension ButtonStyle where Self == VariantButtonStyle {
  public static func variant(
    _ variant: VariantButtonStyle.Variant = .default,
    size: VariantButtonStyle.Size = .default,
    block: Bool = false
  ) -> VariantButtonStyle {
    VariantButtonStyle(variant, size: size, block: block)
  }
}
```

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

extension EnvironmentValues {
  @Entry var buttonGroup: Axis? = nil
  @Entry var buttonGroupSize: CGSize = .zero
}

enum ButtonGroupSpace: Hashable {
  case group
}

struct ButtonGroupFrame {
  let bounds: Anchor<CGRect>
  let outlined: Bool
}

struct ButtonGroupFramesKey: PreferenceKey {
  static var defaultValue: [ButtonGroupFrame] { [] }

  static func reduce(value: inout [ButtonGroupFrame], nextValue: () -> [ButtonGroupFrame]) {
    value.append(contentsOf: nextValue())
  }
}

struct ButtonGroupNestedKey: PreferenceKey {
  static var defaultValue: Bool { false }

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

public struct ButtonGroup<Content: View>: View {
  let orientation: Axis
  let content: Content

  @State private var nested = false
  @State private var size: CGSize = .zero

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

  public var body: some View {
    let shape = orientation == .horizontal
      ? AnyShape(Capsule())
      : AnyShape(RoundedRectangle(cornerRadius: Radius.xl2, style: .continuous))
    stack
      .coordinateSpace(.named(ButtonGroupSpace.group))
      .onGeometryChange(for: CGSize.self) { $0.size } action: { size = $0 }
      .environment(\.buttonGroup, nested ? nil : orientation)
      .environment(\.buttonGroupSize, size)
      .onPreferenceChange(ButtonGroupNestedKey.self) { nested = $0 }
      .modifier(ButtonGroupClip(shape: nested ? nil : shape))
      .overlayPreferenceValue(ButtonGroupFramesKey.self) { frames in
        if !nested {
          GeometryReader { proxy in
            outline(frames.map { (proxy[$0.bounds], $0.outlined) }, shape: shape)
          }
        }
      }
      .transformPreference(ButtonGroupFramesKey.self) { $0 = [] }
      .transformPreference(ButtonGroupNestedKey.self) { $0 = true }
      .fixedSize(horizontal: orientation == .vertical, vertical: orientation == .horizontal)
      .accessibilityElement(children: .contain)
  }

  @ViewBuilder private var stack: some View {
    switch orientation {
    case .horizontal:
      HStack(spacing: nested ? 8 : 0) { content }
    case .vertical:
      VStack(spacing: nested ? 8 : 0) { content }
    }
  }

  @ViewBuilder private func outline(_ frames: [(CGRect, Bool)], shape: AnyShape) -> some View {
    if frames.contains(where: \.1) {
      ZStack(alignment: .topLeading) {
        shape
          .stroke(Color.separator, lineWidth: 1)
          .padding(0.5)
          .mask {
            Path { path in
              for (rect, outlined) in frames where outlined {
                path.addRect(rect)
              }
            }
          }
        ForEach(Array(frames.dropLast().enumerated()), id: \.offset) { _, frame in
          if frame.1 {
            divider(frame.0)
          }
        }
      }
      .clipShape(shape)
      .allowsHitTesting(false)
    }
  }

  private func divider(_ rect: CGRect) -> some View {
    let horizontal = orientation == .horizontal
    return Rectangle()
      .fill(Color.separator)
      .frame(width: horizontal ? 1 : rect.width, height: horizontal ? rect.height : 1)
      .position(
        x: horizontal ? rect.maxX - 0.5 : rect.midX,
        y: horizontal ? rect.midY : rect.maxY - 0.5
      )
  }
}

struct ButtonGroupItem<Content: View>: View {
  let radius: CGFloat
  let content: (UnevenRoundedRectangle) -> Content

  @State private var frame: CGRect = .zero
  @Environment(\.buttonGroup) private var group
  @Environment(\.buttonGroupSize) private var groupSize

  init(radius: CGFloat, @ViewBuilder content: @escaping (UnevenRoundedRectangle) -> Content) {
    self.radius = radius
    self.content = content
  }

  var body: some View {
    if let group {
      content(shape(group))
        .onGeometryChange(for: CGRect.self) { $0.frame(in: .named(ButtonGroupSpace.group)) } action: { frame = $0 }
    } else {
      content(UnevenRoundedRectangle(cornerRadii: RectangleCornerRadii(
        topLeading: radius,
        bottomLeading: radius,
        bottomTrailing: radius,
        topTrailing: radius
      ), style: .continuous))
    }
  }

  private func shape(_ group: Axis) -> UnevenRoundedRectangle {
    let horizontal = group == .horizontal
    let first = horizontal ? frame.minX <= 0.5 : frame.minY <= 0.5
    let last = horizontal
      ? frame.maxX >= groupSize.width - 0.5
      : frame.maxY >= groupSize.height - 0.5
    let round = horizontal ? frame.height / 2 : Radius.xl2
    let start: CGFloat = first ? round : 0
    let end: CGFloat = last ? round : 0
    let radii = horizontal
      ? RectangleCornerRadii(topLeading: start, bottomLeading: start, bottomTrailing: end, topTrailing: end)
      : RectangleCornerRadii(topLeading: start, bottomLeading: end, bottomTrailing: end, topTrailing: start)
    return UnevenRoundedRectangle(cornerRadii: radii, style: .continuous)
  }
}

private struct ButtonGroupClip: ViewModifier {
  let shape: AnyShape?

  func body(content: Content) -> some View {
    if let shape {
      content.clipShape(shape)
    } else {
      content
    }
  }
}

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

  @Environment(\.buttonGroup) private var group

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

  public var body: some View {
    let shape = group == nil ? AnyShape(Capsule()) : AnyShape(Rectangle())
    HStack(spacing: 8) {
      content
    }
    .labelStyle(ButtonLabelStyle(spacing: 8, iconSize: 16))
    .scaledFont(.sm)
    .lineLimit(1)
    .foregroundStyle(Color.label)
    .padding(.horizontal, 10)
    .frame(minHeight: 36)
    .frame(maxWidth: group == .vertical ? .infinity : nil, maxHeight: group == .horizontal ? .infinity : nil)
    .background(Color.control, in: shape)
    .anchorPreference(key: ButtonGroupFramesKey.self, value: .bounds) { anchor in
      group == nil ? [] : [ButtonGroupFrame(bounds: anchor, outlined: false)]
    }
  }
}

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

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

public struct ButtonGroupSeparator: View {
  let orientation: Axis

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

  public var body: some View {
    let vertical = orientation == .vertical
    Rectangle()
      .fill(Color.label.opacity(0.2))
      .frame(width: vertical ? 1 : nil, height: vertical ? nil : 1)
      .padding(vertical ? .vertical : .horizontal, 9)
      .frame(maxWidth: vertical ? nil : .infinity, maxHeight: vertical ? .infinity : nil)
      .padding(vertical ? .trailing : .bottom, -1)
      .zIndex(1)
      .accessibilityHidden(true)
  }
}
```

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

public struct FieldTitle: View {
  let text: Text

  @Environment(\.isEnabled) private var isEnabled

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

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

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

public struct FieldDescription: View {
  let text: Text

  @Environment(\.fieldSetInset) private var inset

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

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

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

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

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

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

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

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

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

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

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

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

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

struct FieldSetInsetKey: PreferenceKey {
  static let defaultValue = false

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

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

  @State private var inset = false

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

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

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

  let text: Text
  let variant: Variant

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

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

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

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

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

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

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

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

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

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

extension EnvironmentValues {
  @Entry public var hapticsEnabled = true
}

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

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

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

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

  @Environment(\.hapticsEnabled) private var enabled

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

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

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

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

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

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

  @State private var count = 0

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

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

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

public struct Separator: View {
  let orientation: Axis

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

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

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

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

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

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

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

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

private struct TextVariantModifier: ViewModifier {
  let variant: TextVariant

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

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

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

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

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

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

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

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

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

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

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

5. Add the files to your app target.

**Jetpack Compose**

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

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

2. Copy the theme files every view uses:

```kt title="kotlin/theme/Theme.kt"
package com.esuiss.ui.theme

import androidx.compose.foundation.isSystemInDarkTheme
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.Immutable
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.dropShadow
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.Shape
import androidx.compose.ui.graphics.shadow.Shadow as DropShadow
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.style.LineHeightStyle
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.DpOffset
import androidx.compose.ui.unit.em
import androidx.compose.ui.unit.sp

internal fun textStyle(size: Double, lineHeight: Double, letterSpacing: Double) = TextStyle(
    fontSize = size.sp,
    lineHeight = lineHeight.sp,
    letterSpacing = letterSpacing.em,
    lineHeightStyle = LineHeightStyle(
        alignment = LineHeightStyle.Alignment.Center,
        trim = LineHeightStyle.Trim.None,
    ),
)

@Immutable
data class Shadow(
    val offsetX: Dp,
    val offsetY: Dp,
    val blur: Dp,
    val color: Color,
)

fun Modifier.shadow(shadow: Shadow, shape: Shape): Modifier = dropShadow(
    shape,
    DropShadow(
        radius = shadow.blur,
        color = shadow.color,
        offset = DpOffset(shadow.offsetX, shadow.offsetY),
    ),
)

val LocalColors = staticCompositionLocalOf { LightColors }

object EsuissTheme {
    val colors: Colors
        @Composable get() = LocalColors.current

    val typography: Typography
        get() = Typography

    val radius: Radius
        get() = Radius

    val shadows: Shadows
        get() = Shadows
}

@Composable
fun EsuissTheme(
    darkTheme: Boolean = isSystemInDarkTheme(),
    content: @Composable () -> Unit,
) {
    CompositionLocalProvider(
        LocalColors provides if (darkTheme) DarkColors else LightColors,
        content = content,
    )
}
```

```kt title="kotlin/theme/Tokens.kt"
package com.esuiss.ui.theme

import androidx.compose.runtime.Immutable
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.dp

@Immutable
data class Colors(
    val surface: Color,
    val surfaceSecondary: Color,
    val surfaceTertiary: Color,
    val surfaceRaised: Color,
    val label: Color,
    val labelSecondary: Color,
    val labelTertiary: Color,
    val labelQuaternary: Color,
    val control: Color,
    val controlPressed: Color,
    val controlSelected: Color,
    val controlDisabled: Color,
    val onControlSelected: Color,
    val itemPressed: Color,
    val itemSelected: Color,
    val separator: Color,
    val separatorStrong: Color,
    val accent: Color,
    val accentPressed: Color,
    val accentSelected: Color,
    val accentDisabled: Color,
    val onAccent: Color,
    val accentSurface: Color,
    val accentSurfacePressed: Color,
    val link: Color,
    val focus: Color,
    val scrim: Color,
    val media: Color,
    val onMedia: Color,
    val danger: Color,
    val dangerSurface: Color,
    val dangerSurfacePressed: Color,
    val success: Color,
    val successSurface: Color,
    val warning: Color,
    val warningSurface: Color,
    val blue: Color,
    val green: Color,
    val orange: Color,
    val red: Color,
    val yellow: Color,
    val purple: Color,
    val pink: Color,
    val indigo: Color,
    val teal: Color,
    val mint: Color,
    val cyan: Color,
    val brown: Color,
    val gray: Color,
    val isDark: Boolean,
)

val LightColors = Colors(
    surface = Color(0xFFFFFFFF),
    surfaceSecondary = Color(0xFFF5F5F7),
    surfaceTertiary = Color(0xFFE8E8ED),
    surfaceRaised = Color(0xFFFFFFFF),
    label = Color(0xFF1D1D1F),
    labelSecondary = Color(0xFF6E6E73),
    labelTertiary = Color(0xFF86868B),
    labelQuaternary = Color(0xFFD2D2D7),
    control = Color(0xFF000000).copy(alpha = 0.04f),
    controlPressed = Color(0xFF000000).copy(alpha = 0.12f),
    controlSelected = Color(0xFF1D1D1F),
    controlDisabled = Color(0xFF000000).copy(alpha = 0.03f),
    onControlSelected = Color(0xFFFFFFFF),
    itemPressed = Color(0xFF000000).copy(alpha = 0.08f),
    itemSelected = Color(0xFF000000).copy(alpha = 0.06f),
    separator = Color(0xFFD2D2D7),
    separatorStrong = Color(0xFF86868B),
    accent = Color(0xFF0071E3),
    accentPressed = Color(0xFF005BB8),
    accentSelected = Color(0xFF0071E3),
    accentDisabled = Color(0xFF0071E3).copy(alpha = 0.4f),
    onAccent = Color(0xFFFFFFFF),
    accentSurface = Color(0xFF0071E3).copy(alpha = 0.09f),
    accentSurfacePressed = Color(0xFF0071E3).copy(alpha = 0.18f),
    link = Color(0xFF0066CC),
    focus = Color(0xFF0071E3),
    scrim = Color(0xFF000000).copy(alpha = 0.48f),
    media = Color(0xFF000000),
    onMedia = Color(0xFFFFFFFF),
    danger = Color(0xFFD0000A),
    dangerSurface = Color(0xFFD70015).copy(alpha = 0.08f),
    dangerSurfacePressed = Color(0xFFD70015).copy(alpha = 0.16f),
    success = Color(0xFF008009),
    successSurface = Color(0xFFEFFAF1),
    warning = Color(0xFFB64400),
    warningSurface = Color(0xFFFFF5EA),
    blue = Color(0xFF007AFF),
    green = Color(0xFF34C759),
    orange = Color(0xFFFF9500),
    red = Color(0xFFFF3B30),
    yellow = Color(0xFFFFCC00),
    purple = Color(0xFFAF52DE),
    pink = Color(0xFFFF2D55),
    indigo = Color(0xFF5856D6),
    teal = Color(0xFF30B0C7),
    mint = Color(0xFF00C7BE),
    cyan = Color(0xFF32ADE6),
    brown = Color(0xFFA2845E),
    gray = Color(0xFF8E8E93),
    isDark = false,
)

val DarkColors = Colors(
    surface = Color(0xFF000000),
    surfaceSecondary = Color(0xFF161617),
    surfaceTertiary = Color(0xFF2C2C2E),
    surfaceRaised = Color(0xFF1D1D1F),
    label = Color(0xFFF5F5F7),
    labelSecondary = Color(0xFFA1A1A6),
    labelTertiary = Color(0xFF86868B),
    labelQuaternary = Color(0xFF424245),
    control = Color(0xFFFFFFFF).copy(alpha = 0.1f),
    controlPressed = Color(0xFFFFFFFF).copy(alpha = 0.22f),
    controlSelected = Color(0xFFF5F5F7),
    controlDisabled = Color(0xFFFFFFFF).copy(alpha = 0.05f),
    onControlSelected = Color(0xFF000000),
    itemPressed = Color(0xFFFFFFFF).copy(alpha = 0.12f),
    itemSelected = Color(0xFFFFFFFF).copy(alpha = 0.1f),
    separator = Color(0xFF424245),
    separatorStrong = Color(0xFF6E6E73),
    accent = Color(0xFF0071E3),
    accentPressed = Color(0xFF004D9E),
    accentSelected = Color(0xFF0071E3),
    accentDisabled = Color(0xFF0071E3).copy(alpha = 0.4f),
    onAccent = Color(0xFFFFFFFF),
    accentSurface = Color(0xFF0071E3).copy(alpha = 0.18f),
    accentSurfacePressed = Color(0xFF0071E3).copy(alpha = 0.3f),
    link = Color(0xFF2997FF),
    focus = Color(0xFF0071E3),
    scrim = Color(0xFF000000).copy(alpha = 0.48f),
    media = Color(0xFF000000),
    onMedia = Color(0xFFFFFFFF),
    danger = Color(0xFFFF5447),
    dangerSurface = Color(0xFFFF453A).copy(alpha = 0.2f),
    dangerSurfacePressed = Color(0xFFFF453A).copy(alpha = 0.36f),
    success = Color(0xFF30D158),
    successSurface = Color(0xFF30D158).copy(alpha = 0.16f),
    warning = Color(0xFFFF9F0A),
    warningSurface = Color(0xFFFF9F0A).copy(alpha = 0.16f),
    blue = Color(0xFF0A84FF),
    green = Color(0xFF30D158),
    orange = Color(0xFFFF9F0A),
    red = Color(0xFFFF453A),
    yellow = Color(0xFFFFD60A),
    purple = Color(0xFFBF5AF2),
    pink = Color(0xFFFF375F),
    indigo = Color(0xFF5E5CE6),
    teal = Color(0xFF40C8E0),
    mint = Color(0xFF66D4CF),
    cyan = Color(0xFF64D2FF),
    brown = Color(0xFFAC8E68),
    gray = Color(0xFF8E8E93),
    isDark = true,
)

object Radius {
    val xs = 3.dp
    val sm = 5.dp
    val md = 8.dp
    val lg = 10.dp
    val xl = 12.dp
    val xl2 = 18.dp
    val xl3 = 28.dp
    val full = 9999.dp
}

object Typography {
    val xs3 = textStyle(11.0, 13.0, 0.006)
    val xs2 = textStyle(12.0, 16.0, 0.0)
    val xs = textStyle(13.0, 18.0, -0.006)
    val sm = textStyle(15.0, 20.0, -0.016)
    val md = textStyle(16.0, 21.0, -0.02)
    val base = textStyle(17.0, 22.0, -0.026)
    val lg = textStyle(20.0, 25.0, -0.023)
    val xl = textStyle(22.0, 28.0, -0.012)
    val xl2 = textStyle(28.0, 34.0, 0.014)
    val xl3 = textStyle(34.0, 41.0, 0.012)

    val all = listOf(xs3, xs2, xs, sm, md, base, lg, xl, xl2, xl3)
}

object Shadows {
    val md = Shadow(2.dp, 4.dp, 12.dp, Color.Black.copy(alpha = 0.08f))
    val lg = Shadow(0.dp, 4.dp, 24.dp, Color.Black.copy(alpha = 0.12f))
}
```

3. Copy the source and every file it uses:

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

import androidx.compose.foundation.gestures.detectTapGestures
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.foundation.text.BasicTextField
import androidx.compose.foundation.text.KeyboardActions
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.foundation.text.selection.LocalTextSelectionColors
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.DisposableEffect
import androidx.compose.runtime.Stable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.focus.FocusRequester
import androidx.compose.ui.focus.focusRequester
import androidx.compose.ui.focus.onFocusChanged
import androidx.compose.ui.graphics.SolidColor
import androidx.compose.ui.input.pointer.pointerInput
import androidx.compose.ui.layout.Layout
import androidx.compose.ui.layout.Placeable
import androidx.compose.ui.layout.layoutId
import androidx.compose.ui.semantics.error
import androidx.compose.ui.semantics.isTraversalGroup
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.input.VisualTransformation
import androidx.compose.ui.unit.Constraints
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

enum class InputGroupAddonAlign { InlineStart, InlineEnd, BlockStart, BlockEnd }

enum class InputGroupButtonSize(internal val buttonSize: ButtonSize) {
    Xs(ButtonSize.Xs),
    Sm(ButtonSize.Sm),
    IconXs(ButtonSize.IconXs),
    IconSm(ButtonSize.IconSm),
}

private object InputGroupControl

@Stable
private class InputGroupState {
    val focusRequester = FocusRequester()
    var focused by mutableStateOf(false)
    var enabled by mutableStateOf(true)
    var invalid by mutableStateOf(false)
    var inlineStart by mutableIntStateOf(0)
    var inlineEnd by mutableIntStateOf(0)
    var blockStart by mutableIntStateOf(0)
    var blockEnd by mutableIntStateOf(0)
    var multiline by mutableIntStateOf(0)
    var controls by mutableIntStateOf(0)
}

@Stable
private class InputGroupAddonState {
    var buttons by mutableIntStateOf(0)
}

private val LocalInputGroup = staticCompositionLocalOf<InputGroupState?> { null }

private val LocalInputGroupAddon = staticCompositionLocalOf<InputGroupAddonState?> { null }

@Composable
fun InputGroup(
    modifier: Modifier = Modifier,
    enabled: Boolean = LocalFieldState.current.enabled,
    invalid: Boolean = LocalFieldState.current.invalid,
    content: @Composable () -> Unit,
) {
    val colors = EsuissTheme.colors
    val state = remember { InputGroupState() }
    state.enabled = enabled
    state.invalid = invalid
    val tall = state.blockStart > 0 || state.blockEnd > 0 || state.multiline > 0
    val item = rememberButtonGroupItem(LocalButtonGroup.current, RoundedCornerShape(if (tall) Radius.xl else Radius.lg))
    CompositionLocalProvider(
        LocalInputGroup provides state,
        LocalTextSelectionColors provides formSelectionColors(colors),
    ) {
        Layout(
            content = content,
            modifier = modifier
                .then(item.modifier)
                .fillMaxWidth()
                .formInputSurface(colors, item.shape, state.focused, invalid, enabled)
                .semantics { isTraversalGroup = true },
        ) { measurables, constraints ->
            val width = if (constraints.hasBoundedWidth) constraints.maxWidth else 320.dp.roundToPx()
            val rowMin = 44.dp.roundToPx()
            val blockStart = measurables.filter { it.layoutId == InputGroupAddonAlign.BlockStart }
                .map { it.measure(Constraints(minWidth = width, maxWidth = width)) }
            val blockEnd = measurables.filter { it.layoutId == InputGroupAddonAlign.BlockEnd }
                .map { it.measure(Constraints(minWidth = width, maxWidth = width)) }
            var used = 0
            val start = measurables.filter { it.layoutId == InputGroupAddonAlign.InlineStart }
                .map { it.measure(Constraints(maxWidth = (width - used).coerceAtLeast(0))).also { p -> used += p.width } }
            val end = measurables.filter { it.layoutId == InputGroupAddonAlign.InlineEnd }
                .map { it.measure(Constraints(maxWidth = (width - used).coerceAtLeast(0))).also { p -> used += p.width } }
            val middleMeasurables = measurables.filter { it.layoutId !is InputGroupAddonAlign }
            val remaining = (width - used).coerceAtLeast(0)
            val share = if (middleMeasurables.isEmpty()) 0 else remaining / middleMeasurables.size
            val middle = middleMeasurables.map { it.measure(Constraints(minWidth = share, maxWidth = share)) }
            val inline: List<Placeable> = start + middle + end
            val rowHeight = maxOf(if (tall) 0 else rowMin, inline.maxOfOrNull { it.height } ?: 0)
            val height = blockStart.sumOf { it.height } + rowHeight + blockEnd.sumOf { it.height }
            layout(width, height.coerceIn(constraints.minHeight, constraints.maxHeight)) {
                var y = 0
                blockStart.forEach {
                    it.placeRelative(0, y)
                    y += it.height
                }
                var x = 0
                inline.forEach {
                    it.placeRelative(x, y + (rowHeight - it.height) / 2)
                    x += it.width
                }
                y += rowHeight
                blockEnd.forEach {
                    it.placeRelative(0, y)
                    y += it.height
                }
            }
        }
    }
}

@Composable
fun InputGroupAddon(
    modifier: Modifier = Modifier,
    align: InputGroupAddonAlign = InputGroupAddonAlign.InlineStart,
    content: @Composable RowScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val group = LocalInputGroup.current
    val addon = remember { InputGroupAddonState() }
    if (group != null) {
        DisposableEffect(group, align) {
            when (align) {
                InputGroupAddonAlign.InlineStart -> group.inlineStart += 1
                InputGroupAddonAlign.InlineEnd -> group.inlineEnd += 1
                InputGroupAddonAlign.BlockStart -> group.blockStart += 1
                InputGroupAddonAlign.BlockEnd -> group.blockEnd += 1
            }
            onDispose {
                when (align) {
                    InputGroupAddonAlign.InlineStart -> group.inlineStart -= 1
                    InputGroupAddonAlign.InlineEnd -> group.inlineEnd -= 1
                    InputGroupAddonAlign.BlockStart -> group.blockStart -= 1
                    InputGroupAddonAlign.BlockEnd -> group.blockEnd -= 1
                }
            }
        }
    }
    val enabled = group?.enabled ?: true
    val hasButton = addon.buttons > 0
    val hasControl = (group?.controls ?: 0) > 0 && (group?.multiline ?: 0) == 0
    val edge = if (hasButton) 8.dp else 12.dp
    val padding = when (align) {
        InputGroupAddonAlign.InlineStart -> Modifier.padding(start = edge, top = 8.dp, bottom = 8.dp)
        InputGroupAddonAlign.InlineEnd -> Modifier.padding(end = edge, top = 8.dp, bottom = 8.dp)
        InputGroupAddonAlign.BlockStart -> Modifier.padding(start = 12.dp, end = 12.dp, top = if (hasControl) 14.dp else 12.dp)
        InputGroupAddonAlign.BlockEnd -> Modifier.padding(start = 12.dp, end = 12.dp, bottom = if (hasControl) 14.dp else 12.dp)
    }
    val foreground = if (enabled) colors.labelSecondary else colors.labelQuaternary
    Row(
        modifier = modifier
            .layoutId(align)
            .pointerInput(group) {
                detectTapGestures {
                    if (group != null && group.enabled && group.controls > 0) group.focusRequester.requestFocus()
                }
            }
            .then(padding),
        horizontalArrangement = Arrangement.spacedBy(8.dp, if (align == InputGroupAddonAlign.BlockStart || align == InputGroupAddonAlign.BlockEnd) Alignment.Start else Alignment.CenterHorizontally),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        CompositionLocalProvider(
            LocalInputGroupAddon provides addon,
            LocalContentStyle provides Typography.base.copy(color = foreground),
            LocalContentColor provides foreground,
            LocalIconSize provides 16.dp,
        ) {
            content()
        }
    }
}

@Composable
fun InputGroupText(
    modifier: Modifier = Modifier,
    content: @Composable RowScope.() -> Unit,
) {
    Row(
        modifier = modifier,
        horizontalArrangement = Arrangement.spacedBy(8.dp),
        verticalAlignment = Alignment.CenterVertically,
        content = content,
    )
}

@Composable
fun InputGroupText(text: String, modifier: Modifier = Modifier) {
    BasicText(text, modifier = modifier, style = LocalContentStyle.current, maxLines = 1)
}

@Composable
fun InputGroupButton(
    onClick: () -> Unit,
    modifier: Modifier = Modifier,
    size: InputGroupButtonSize = InputGroupButtonSize.Xs,
    variant: ButtonVariant = ButtonVariant.Ghost,
    enabled: Boolean = true,
    content: @Composable RowScope.() -> Unit,
) {
    val addon = LocalInputGroupAddon.current
    if (addon != null) {
        DisposableEffect(addon) {
            addon.buttons += 1
            onDispose { addon.buttons -= 1 }
        }
    }
    val groupEnabled = LocalInputGroup.current?.enabled ?: true
    Button(
        onClick = onClick,
        modifier = modifier,
        variant = variant,
        size = size.buttonSize,
        enabled = enabled && groupEnabled,
    ) {
        CompositionLocalProvider(LocalIconSize provides if (size == InputGroupButtonSize.Xs) 14.dp else LocalIconSize.current) {
            content()
        }
    }
}

@Composable
fun InputGroupButton(
    text: String,
    onClick: () -> Unit,
    modifier: Modifier = Modifier,
    size: InputGroupButtonSize = InputGroupButtonSize.Xs,
    variant: ButtonVariant = ButtonVariant.Ghost,
    enabled: Boolean = true,
) {
    InputGroupButton(onClick, modifier, size, variant, enabled) {
        BasicText(text, style = LocalContentStyle.current, maxLines = 1)
    }
}

@Composable
private fun RegisterControl(group: InputGroupState?, multiline: Boolean) {
    if (group == null) return
    DisposableEffect(group, multiline) {
        group.controls += 1
        if (multiline) group.multiline += 1
        onDispose {
            group.controls -= 1
            if (multiline) group.multiline -= 1
        }
    }
}

@Composable
fun InputGroupInput(
    value: String,
    onValueChange: (String) -> Unit,
    modifier: Modifier = Modifier,
    placeholder: String? = null,
    readOnly: Boolean = false,
    keyboardOptions: KeyboardOptions = KeyboardOptions.Default,
    keyboardActions: KeyboardActions = KeyboardActions.Default,
    visualTransformation: VisualTransformation = VisualTransformation.None,
) {
    val group = LocalInputGroup.current
    RegisterControl(group, multiline = false)
    val colors = EsuissTheme.colors
    val enabled = group?.enabled ?: true
    val invalid = group?.invalid ?: false
    val textStyle = Typography.base.copy(color = if (enabled) colors.label else colors.labelQuaternary)
    val start = if ((group?.inlineStart ?: 0) > 0) 6.dp else 12.dp
    val end = if ((group?.inlineEnd ?: 0) > 0) 6.dp else 12.dp
    val hasBlockStart = (group?.blockStart ?: 0) > 0
    val hasBlockEnd = (group?.blockEnd ?: 0) > 0
    val top = when {
        hasBlockEnd -> 12.dp
        hasBlockStart -> 8.dp
        else -> 11.dp
    }
    val bottom = when {
        hasBlockStart -> 12.dp
        hasBlockEnd -> 8.dp
        else -> 11.dp
    }
    BasicTextField(
        value = value,
        onValueChange = onValueChange,
        modifier = modifier
            .layoutId(InputGroupControl)
            .then(if (group != null) Modifier.focusRequester(group.focusRequester).onFocusChanged { group.focused = it.isFocused } else Modifier)
            .then(if (invalid) Modifier.semantics { error("Invalid") } else Modifier),
        enabled = enabled,
        readOnly = readOnly,
        textStyle = textStyle,
        keyboardOptions = keyboardOptions,
        keyboardActions = keyboardActions,
        singleLine = true,
        visualTransformation = visualTransformation,
        cursorBrush = SolidColor(colors.accent),
        decorationBox = { inner ->
            Box(
                modifier = Modifier
                    .fillMaxWidth()
                    .padding(start = start, end = end, top = top, bottom = bottom),
                contentAlignment = Alignment.CenterStart,
            ) {
                if (value.isEmpty() && placeholder != null) {
                    BasicText(
                        placeholder,
                        style = textStyle.copy(color = if (enabled) colors.labelSecondary else colors.labelQuaternary),
                        maxLines = 1,
                    )
                }
                inner()
            }
        },
    )
}

@Composable
fun InputGroupTextarea(
    value: String,
    onValueChange: (String) -> Unit,
    modifier: Modifier = Modifier,
    placeholder: String? = null,
    readOnly: Boolean = false,
    minLines: Int = 3,
    maxLines: Int = Int.MAX_VALUE,
    keyboardOptions: KeyboardOptions = KeyboardOptions.Default,
    keyboardActions: KeyboardActions = KeyboardActions.Default,
) {
    val group = LocalInputGroup.current
    RegisterControl(group, multiline = true)
    val colors = EsuissTheme.colors
    val enabled = group?.enabled ?: true
    val invalid = group?.invalid ?: false
    val textStyle = Typography.base.copy(color = if (enabled) colors.label else colors.labelQuaternary)
    BasicTextField(
        value = value,
        onValueChange = onValueChange,
        modifier = modifier
            .layoutId(InputGroupControl)
            .then(if (group != null) Modifier.focusRequester(group.focusRequester).onFocusChanged { group.focused = it.isFocused } else Modifier)
            .then(if (invalid) Modifier.semantics { error("Invalid") } else Modifier),
        enabled = enabled,
        readOnly = readOnly,
        textStyle = textStyle,
        keyboardOptions = keyboardOptions,
        keyboardActions = keyboardActions,
        minLines = minLines,
        maxLines = maxLines,
        cursorBrush = SolidColor(colors.accent),
        decorationBox = { inner ->
            Box(
                modifier = Modifier
                    .fillMaxWidth()
                    .padding(horizontal = 12.dp, vertical = 10.dp),
                contentAlignment = Alignment.TopStart,
            ) {
                if (value.isEmpty() && placeholder != null) {
                    BasicText(
                        placeholder,
                        style = textStyle.copy(color = if (enabled) colors.labelSecondary else colors.labelQuaternary),
                    )
                }
                inner()
            }
        },
    )
}
```

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

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

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

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

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

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

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

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

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

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

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

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

enum class ButtonGroupOrientation { Horizontal, Vertical }

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

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

internal object ButtonGroupFill

private object ButtonGroupDivider

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

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

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

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

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

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

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

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

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

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

val LocalContentStyle = compositionLocalOf { TextStyle.Default }

val LocalContentColor = compositionLocalOf { Color.Unspecified }

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

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

import androidx.compose.foundation.background
import androidx.compose.foundation.gestures.Orientation
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.ColumnScope
import androidx.compose.foundation.layout.LayoutScopeMarker
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.heightIn
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.Immutable
import androidx.compose.runtime.remember
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.layout.layout
import androidx.compose.ui.platform.LocalConfiguration
import androidx.compose.ui.semantics.LiveRegionMode
import androidx.compose.ui.semantics.heading
import androidx.compose.ui.semantics.liveRegion
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography

enum class FieldOrientation { Vertical, Horizontal, Responsive }

enum class FieldGroupVariant { Default, Inset }

enum class FieldLegendVariant { Legend, Label }

@Immutable
internal class FieldState(val enabled: Boolean, val invalid: Boolean)

internal val LocalFieldState = staticCompositionLocalOf { FieldState(enabled = true, invalid = false) }

private val LocalFieldSetInset = staticCompositionLocalOf { false }

private val LocalFieldGroupVariant = staticCompositionLocalOf<FieldGroupVariant?> { null }

private val LocalFieldInset = staticCompositionLocalOf { false }

@LayoutScopeMarker
@Immutable
interface FieldScope {
    fun Modifier.weight(weight: Float): Modifier
}

private class RowFieldScope(private val scope: RowScope) : FieldScope {
    override fun Modifier.weight(weight: Float): Modifier = with(scope) { this@weight.weight(weight, true) }
}

private object ColumnFieldScope : FieldScope {
    override fun Modifier.weight(weight: Float): Modifier = this
}

@Composable
fun FieldSet(
    modifier: Modifier = Modifier,
    variant: FieldGroupVariant = FieldGroupVariant.Default,
    enabled: Boolean = true,
    content: @Composable ColumnScope.() -> Unit,
) {
    val inset = variant == FieldGroupVariant.Inset
    CompositionLocalProvider(
        LocalFieldSetInset provides inset,
        LocalFieldState provides FieldState(enabled, LocalFieldState.current.invalid),
    ) {
        Column(
            modifier = modifier.fillMaxWidth(),
            verticalArrangement = Arrangement.spacedBy(if (inset) 8.dp else 24.dp),
            content = content,
        )
    }
}

@Composable
fun FieldLegend(
    text: String,
    modifier: Modifier = Modifier,
    variant: FieldLegendVariant = FieldLegendVariant.Legend,
) {
    val colors = EsuissTheme.colors
    val inset = LocalFieldSetInset.current
    val enabled = LocalFieldState.current.enabled
    val style = if (inset) {
        Typography.xs.copy(color = if (enabled) colors.labelSecondary else colors.labelQuaternary)
    } else {
        Typography.base.copy(color = if (enabled) colors.label else colors.labelQuaternary, fontWeight = FontWeight.SemiBold)
    }
    BasicText(
        text = if (inset) text.uppercase() else text,
        modifier = modifier
            .then(if (variant == FieldLegendVariant.Legend) Modifier.semantics { heading() } else Modifier)
            .padding(start = if (inset) 16.dp else 0.dp, bottom = if (inset) 0.dp else 12.dp),
        style = style,
    )
}

@Composable
fun FieldGroup(
    modifier: Modifier = Modifier,
    variant: FieldGroupVariant = FieldGroupVariant.Default,
    content: @Composable () -> Unit,
) {
    val colors = EsuissTheme.colors
    CompositionLocalProvider(
        LocalFieldSetInset provides false,
        LocalFieldGroupVariant provides variant,
    ) {
        if (variant == FieldGroupVariant.Inset) {
            FormDividedStack(
                orientation = Orientation.Vertical,
                dividerColor = colors.separator,
                modifier = modifier
                    .fillMaxWidth()
                    .clip(RoundedCornerShape(Radius.xl2))
                    .background(colors.surfaceSecondary),
                dividerInsetStart = 16.dp,
                content = content,
            )
        } else {
            Column(
                modifier = modifier.fillMaxWidth(),
                verticalArrangement = Arrangement.spacedBy(28.dp),
            ) {
                content()
            }
        }
    }
}

@Composable
fun Field(
    modifier: Modifier = Modifier,
    orientation: FieldOrientation = FieldOrientation.Vertical,
    enabled: Boolean = LocalFieldState.current.enabled,
    invalid: Boolean = false,
    content: @Composable FieldScope.() -> Unit,
) {
    val inset = LocalFieldGroupVariant.current == FieldGroupVariant.Inset
    val horizontal = when (orientation) {
        FieldOrientation.Vertical -> false
        FieldOrientation.Horizontal -> true
        FieldOrientation.Responsive -> LocalConfiguration.current.screenWidthDp >= 768
    }
    val sizing = modifier
        .fillMaxWidth()
        .then(if (inset) Modifier.heightIn(min = 44.dp).padding(horizontal = 16.dp, vertical = 6.dp) else Modifier)
    CompositionLocalProvider(
        LocalFieldGroupVariant provides null,
        LocalFieldInset provides inset,
        LocalFieldState provides FieldState(enabled, invalid),
    ) {
        if (horizontal) {
            Row(
                modifier = sizing,
                horizontalArrangement = Arrangement.spacedBy(12.dp),
                verticalAlignment = Alignment.CenterVertically,
            ) {
                val scope = remember(this) { RowFieldScope(this) }
                scope.content()
            }
        } else {
            Column(
                modifier = sizing,
                verticalArrangement = Arrangement.spacedBy(12.dp, Alignment.CenterVertically),
            ) {
                ColumnFieldScope.content()
            }
        }
    }
}

@Composable
fun FieldScope.FieldContent(
    modifier: Modifier = Modifier,
    content: @Composable ColumnScope.() -> Unit,
) {
    Column(
        modifier = modifier.weight(1f),
        verticalArrangement = Arrangement.spacedBy(4.dp),
        content = content,
    )
}

@Composable
fun FieldLabel(text: String, modifier: Modifier = Modifier) {
    val colors = EsuissTheme.colors
    val enabled = LocalFieldState.current.enabled
    BasicText(
        text = text,
        modifier = modifier,
        style = Typography.base.copy(
            color = if (enabled) colors.label else colors.labelQuaternary,
            fontWeight = if (LocalFieldInset.current) FontWeight.Normal else FontWeight.SemiBold,
        ),
    )
}

@Composable
fun FieldTitle(text: String, modifier: Modifier = Modifier) {
    val colors = EsuissTheme.colors
    val enabled = LocalFieldState.current.enabled
    BasicText(
        text = text,
        modifier = modifier,
        style = Typography.base.copy(
            color = if (enabled) colors.label else colors.labelQuaternary,
            fontWeight = FontWeight.SemiBold,
        ),
    )
}

@Composable
fun FieldDescription(text: String, modifier: Modifier = Modifier) {
    val colors = EsuissTheme.colors
    val inset = LocalFieldSetInset.current
    BasicText(
        text = text,
        modifier = modifier.padding(start = if (inset) 16.dp else 0.dp),
        style = (if (inset) Typography.xs else Typography.sm).copy(color = colors.labelSecondary),
    )
}

@Composable
fun FieldSeparator(
    modifier: Modifier = Modifier,
    text: String? = null,
) {
    val colors = EsuissTheme.colors
    Box(
        modifier = modifier
            .fillMaxWidth()
            .layout { measurable, constraints ->
                val placeable = measurable.measure(constraints)
                val overlap = 8.dp.roundToPx()
                val height = (placeable.height - overlap * 2).coerceAtLeast(0)
                layout(placeable.width, height) { placeable.place(0, -overlap) }
            }
            .heightIn(min = 20.dp),
        contentAlignment = Alignment.Center,
    ) {
        Separator()
        if (text != null) {
            BasicText(
                text = text,
                modifier = Modifier.background(colors.surface).padding(horizontal = 8.dp),
                style = Typography.sm.copy(color = colors.labelSecondary),
            )
        }
    }
}

@Composable
fun FieldError(text: String?, modifier: Modifier = Modifier) {
    if (text.isNullOrEmpty()) return
    BasicText(
        text = text,
        modifier = modifier.semantics { liveRegion = LiveRegionMode.Polite },
        style = Typography.sm.copy(color = EsuissTheme.colors.danger),
    )
}

@Composable
fun FieldError(errors: List<String?>, modifier: Modifier = Modifier) {
    val messages = errors.filterNotNull().filter { it.isNotEmpty() }.distinct()
    val text = when (messages.size) {
        0 -> null
        1 -> messages[0]
        else -> messages.joinToString("\n") { "• $it" }
    }
    FieldError(text, modifier)
}
```

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

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

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

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

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

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

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

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

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

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

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

import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.RowScope
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography

@Composable
fun Label(
    modifier: Modifier = Modifier,
    enabled: Boolean = true,
    content: @Composable RowScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val color = if (enabled) colors.label else colors.labelQuaternary
    Row(
        modifier = modifier,
        horizontalArrangement = Arrangement.spacedBy(8.dp),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        CompositionLocalProvider(
            LocalContentStyle provides Typography.base.copy(color = color, fontWeight = FontWeight.SemiBold),
            LocalContentColor provides color,
        ) {
            content()
        }
    }
}

@Composable
fun Label(
    text: String,
    modifier: Modifier = Modifier,
    enabled: Boolean = true,
) {
    Label(modifier, enabled) {
        BasicText(text, style = LocalContentStyle.current)
    }
}
```

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

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

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

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

## Usage

```tsx
import { InputGroup, InputGroupAddon, InputGroupButton, InputGroupText, InputGroupInput, InputGroupTextarea } from "@/components/ui/input-group"
```

```tsx
<View className="gap-4">
  <SearchDemo />
  <InputGroup>
    <InputGroupAddon>
      <InputGroupText>https://</InputGroupText>
    </InputGroupAddon>
    <InputGroupInput placeholder="example.com" autoCapitalize="none" />
    <InputGroupAddon align="inline-end">
      <InputGroupText>.com</InputGroupText>
    </InputGroupAddon>
  </InputGroup>
  <InputGroup>
    <InputGroupInput defaultValue="sk_live_51H8" />
    <InputGroupAddon align="inline-end">
      <InputGroupButton size="icon-xs" accessibilityLabel="Copy">
        <Icon as={CopyIcon} />
      </InputGroupButton>
    </InputGroupAddon>
  </InputGroup>
  <InputGroup>
    <InputGroupInput placeholder="Searching..." />
    <InputGroupAddon align="inline-end">
      <Spinner />
    </InputGroupAddon>
  </InputGroup>
  <InputGroup invalid>
    <InputGroupInput defaultValue="not-an-email" />
    <InputGroupAddon align="inline-end">
      <InputGroupText>Invalid</InputGroupText>
    </InputGroupAddon>
  </InputGroup>
  <InputGroup disabled>
    <InputGroupInput placeholder="Disabled" />
    <InputGroupAddon>
      <Icon as={MagnifyingGlassIcon} />
    </InputGroupAddon>
  </InputGroup>
</View>
```

Add children in any order; the group sorts start addons before the input and end addons after it. Put short labels such as a URL prefix or a unit in `InputGroupText`, and actions in `InputGroupButton`, a small rounded `Button` that defaults to the `ghost` variant and `xs` size.

Use a `block-end` addon with `InputGroupTextarea` for a footer row, for example a character count and a send button. Set `invalid` or `disabled` on the group, or let a Field provide them.

## Examples

### With textarea

A textarea with a footer row holding a usage label and a button.

![Preview](https://uim.suiss.app/previews/components-input-group--with-textarea.light.webp)

```tsx
import { ArrowUpIcon } from "phosphor-react-native"
import { Icon } from "@/components/ui/icon"
import { InputGroup, InputGroupAddon, InputGroupButton, InputGroupText, InputGroupTextarea } from "@/components/ui/input-group"

export function InputGroupWithTextareaExample() {
  return (
    <InputGroup>
      <InputGroupTextarea
        placeholder="Ask, search or chat..."
        numberOfLines={3}
      />
      <InputGroupAddon align="block-end" className="justify-between">
        <InputGroupText>52% used</InputGroupText>
        <InputGroupButton
          variant="default"
          size="icon-xs"
          accessibilityLabel="Send"
        >
          <Icon as={ArrowUpIcon} />
        </InputGroupButton>
      </InputGroupAddon>
    </InputGroup>
  )
}
```

```swift
import EsuissUI
import PhosphorSwift
import SwiftUI

struct InputGroupIcon: View {
  let image: Image

  var body: some View {
    image.frame(width: 16, height: 16)
  }
}

struct InputGroupTextareaDemo: View {
  @State private var message = ""

  var body: some View {
    InputGroup {
      InputGroupTextarea("Ask, search or chat...", text: $message, lineLimit: 3...8)
      InputGroupAddon(align: .blockEnd) {
        InputGroupText("52% used")
        Spacer(minLength: 0)
        InputGroupButton(variant: .default, size: .iconXs) {} label: {
          InputGroupIcon(image: Ph.arrowUp.regular)
        }
        .accessibilityLabel(Text("Send"))
      }
    }
  }
}
```

```kotlin
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.ArrowUp
import com.esuiss.ui.components.ButtonVariant
import com.esuiss.ui.components.Icon
import com.esuiss.ui.components.InputGroup
import com.esuiss.ui.components.InputGroupAddon
import com.esuiss.ui.components.InputGroupAddonAlign
import com.esuiss.ui.components.InputGroupButton
import com.esuiss.ui.components.InputGroupButtonSize
import com.esuiss.ui.components.InputGroupText
import com.esuiss.ui.components.InputGroupTextarea

@Composable
fun InputGroupWithTextarea() {
    var value by rememberSaveable { mutableStateOf("") }
    InputGroup {
        InputGroupTextarea(value, { value = it }, placeholder = "Ask, search or chat...", minLines = 3)
        InputGroupAddon(Modifier.fillMaxWidth(), align = InputGroupAddonAlign.BlockEnd) {
            InputGroupText("52% used")
            Spacer(Modifier.weight(1f))
            InputGroupButton(onClick = {}, size = InputGroupButtonSize.IconXs, variant = ButtonVariant.Default) {
                Icon(PhosphorIcons.Regular.ArrowUp, contentDescription = "Send")
            }
        }
    }
}
```

### Block start

A label addon above the input with `block-start`.

![Preview](https://uim.suiss.app/previews/components-input-group--block-start.light.webp)

```tsx
import { InputGroup, InputGroupAddon, InputGroupInput } from "@/components/ui/input-group"
import { Text } from "@/components/ui/text"

export function InputGroupBlockStartExample() {
  return (
    <InputGroup>
      <InputGroupInput placeholder="Enter your name" />
      <InputGroupAddon align="block-start">
        <Text className="text-sm font-medium text-label">Full name</Text>
      </InputGroupAddon>
    </InputGroup>
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct InputGroupBlockStartDemo: View {
  @State private var name = ""

  var body: some View {
    InputGroup {
      InputGroupInput("Enter your name", text: $name)
      InputGroupAddon(align: .blockStart) {
        Text("Full name")
          .textStyle(.sm, weight: .medium)
          .foregroundStyle(Color.label)
      }
    }
  }
}
```

```kotlin
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.text.font.FontWeight
import com.esuiss.ui.components.InputGroup
import com.esuiss.ui.components.InputGroupAddon
import com.esuiss.ui.components.InputGroupAddonAlign
import com.esuiss.ui.components.InputGroupInput
import com.esuiss.ui.components.Text
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography

@Composable
fun InputGroupBlockStart() {
    var value by rememberSaveable { mutableStateOf("") }
    InputGroup {
        InputGroupInput(value, { value = it }, placeholder = "Enter your name")
        InputGroupAddon(align = InputGroupAddonAlign.BlockStart) {
            Text("Full name", style = Typography.sm.copy(fontWeight = FontWeight.Medium, color = EsuissTheme.colors.label))
        }
    }
}
```

## API Reference

### InputGroup

Field container that lays out the input and addons.

### InputGroupAddon

Slot for text, icons or buttons beside or around the input.

### InputGroupButton

Compact button inside an addon.

### InputGroupText

Text inside an addon.

### InputGroupInput

Single-line input without its own border.

### InputGroupTextarea

Multi-line input without its own border.

## Accessibility

- The container has the `group` role.
- Addons are not separate accessibility elements; their text is not announced with the input, so give the input an `accessibilityLabel` that includes needed context.
- Icon-only buttons need an `accessibilityLabel`.

## Notes

- Uses `bg-control`, `border-focus`, `border-danger` and `bg-control-disabled` tokens; the invalid tint is stronger in dark mode.
- Light and dark follow the system appearance.