# Input Accessory Bar

A toolbar above the keyboard with previous, next and done buttons for moving through form fields.

Input Accessory Bar 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-accessory-bar

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

```tsx
import { View } from "react-native"
import { InputAccessoryBar, InputAccessoryBarInput } from "@/components/ui/input-accessory-bar"
import { KeyboardScrollView } from "@/components/ui/keyboard-scroll-view"
import { Text } from "@/components/ui/text"

function Field({ label, autoFocus }: { label: string; autoFocus?: boolean }) {
  return (
    <View className="gap-1.5">
      <Text variant="small">{label}</Text>
      <InputAccessoryBarInput placeholder={label} autoFocus={autoFocus} />
    </View>
  )
}

function Form({ autoFocus = false }: { autoFocus?: boolean }) {
  return (
    <KeyboardScrollView className="-m-4" contentContainerClassName="gap-4 p-4">
      <Field label="Name" autoFocus={autoFocus} />
      <Field label="Email" />
      <Field label="Phone" />
      <Field label="City" />
    </KeyboardScrollView>
  )
}

export function InputAccessoryBarExample() {
  return (
    <InputAccessoryBar>
      <Form />
    </InputAccessoryBar>
  )
}
```

```swift
import EsuissUI
import SwiftUI

enum InputAccessoryBarField: Hashable {
  case name, email, phone, city, subject, message
}

struct InputAccessoryBarRow: View {
  let label: LocalizedStringKey
  let field: InputAccessoryBarField
  let focus: FocusState<InputAccessoryBarField?>.Binding

  @State private var text = ""

  var body: some View {
    VStack(alignment: .leading, spacing: 6) {
      Text(label)
        .textVariant(.small)
        .accessibilityHidden(true)
      TextField(label, text: $text)
        .textFieldStyle(.input)
        .focused(focus, equals: field)
        .submitLabel(.next)
    }
  }
}

struct InputAccessoryBarForm: View {
  var autoFocus = false
  var previousLabel: LocalizedStringKey = "Previous"
  var nextLabel: LocalizedStringKey = "Next"
  var doneLabel: LocalizedStringKey = "Done"

  @FocusState private var focus: InputAccessoryBarField?

  var body: some View {
    KeyboardScrollView {
      VStack(alignment: .leading, spacing: 16) {
        InputAccessoryBarRow(label: "Name", field: .name, focus: $focus)
        InputAccessoryBarRow(label: "Email", field: .email, focus: $focus)
        InputAccessoryBarRow(label: "Phone", field: .phone, focus: $focus)
        InputAccessoryBarRow(label: "City", field: .city, focus: $focus)
      }
      .padding(16)
    }
    .inputAccessoryBar(
      focus: $focus,
      order: [.name, .email, .phone, .city],
      previousLabel: previousLabel,
      nextLabel: nextLabel,
      doneLabel: doneLabel
    )
    .onAppear {
      if autoFocus { focus = .name }
    }
  }
}
```

```kotlin
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.focus.FocusRequester
import androidx.compose.ui.focus.focusRequester
import androidx.compose.ui.unit.dp
import com.esuiss.ui.components.Input
import com.esuiss.ui.components.InputAccessoryBar
import com.esuiss.ui.components.InputAccessoryState
import com.esuiss.ui.components.KeyboardScrollView
import com.esuiss.ui.components.Screen
import com.esuiss.ui.components.Text
import com.esuiss.ui.components.TextVariant
import com.esuiss.ui.components.inputAccessory
import com.esuiss.ui.components.rememberInputAccessoryState

@Composable
fun InputAccessoryBarExample() {
    InputAccessoryBarForm(autoFocus = false)
}

@Composable
fun InputAccessoryBarField(
    label: String,
    state: InputAccessoryState,
    index: Int,
    autoFocus: Boolean = false,
) {
    var value by rememberSaveable(label) { mutableStateOf("") }
    val requester = remember { FocusRequester() }
    if (autoFocus) {
        LaunchedEffect(Unit) { requester.requestFocus() }
    }
    Column(Modifier.fillMaxWidth(), verticalArrangement = Arrangement.spacedBy(6.dp)) {
        Text(label, variant = TextVariant.Small)
        Input(
            value,
            { value = it },
            Modifier.focusRequester(requester).inputAccessory(state, index),
            placeholder = label,
        )
    }
}

@Composable
fun InputAccessoryBarForm(
    autoFocus: Boolean,
    previousLabel: String = "Previous",
    nextLabel: String = "Next",
    doneLabel: String = "Done",
) {
    val state = rememberInputAccessoryState()
    Screen {
        KeyboardScrollView(
            modifier = Modifier.fillMaxSize(),
            contentPadding = PaddingValues(16.dp),
            verticalArrangement = Arrangement.spacedBy(16.dp),
        ) {
            InputAccessoryBarField("Name", state, 0, autoFocus)
            InputAccessoryBarField("Email", state, 1)
            InputAccessoryBarField("Phone", state, 2)
            InputAccessoryBarField("City", state, 3)
        }
        InputAccessoryBar(state, previousLabel = previousLabel, nextLabel = nextLabel, doneLabel = doneLabel)
    }
}
```

`InputAccessoryBar` connects a set of inputs and shows a bar above the keyboard while one of them is focused. The up and down arrows move focus to the previous or next input, and the done button dismisses the keyboard.

On iOS the bar is a native `InputAccessoryView`, attached to the keyboard. On Android it is rendered through a portal and positioned just above the keyboard while an input is focused.

## Installation

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

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

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

The CLI also adds what it builds on: [Button](/docs/components/button), [Icon](/docs/components/icon), [Input](/docs/components/input), [Keyboard Scroll View](/docs/components/keyboard-scroll-view), [Text](/docs/components/text).

### Manual

**Uniwind**

1. Install the dependencies:

```bash title="Terminal"
npx expo install cn phosphor-react-native react-native-svg
```

2. Add the pieces it builds on: [Button](/docs/components/button), [Icon](/docs/components/icon), [Input](/docs/components/input), [Keyboard Scroll View](/docs/components/keyboard-scroll-view), [Text](/docs/components/text), and the primitives `components/primitives/hooks.tsx`, `components/primitives/keyboard.tsx`, `components/primitives/portal.tsx`.

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

```tsx title="uniwind/components/ui/input-accessory-bar.tsx"
import { cn } from "cn"
import { CaretDownIcon, CaretUpIcon } from "phosphor-react-native"
import * as React from "react"
import {
  InputAccessoryView,
  Keyboard,
  Platform,
  type TextInput,
  type TextInputProps,
  View,
} from "react-native"
import { useComposedRefs } from "@/components/primitives/hooks"
import {
  setKeyboardAccessoryHeight,
  useKeyboard,
} from "@/components/primitives/keyboard"
import { Portal } from "@/components/primitives/portal"
import { Button } from "@/components/ui/button"
import { Icon } from "@/components/ui/icon"
import { Input } from "@/components/ui/input"
import { KeyboardScrollViewContext } from "@/components/ui/keyboard-scroll-view"
import { Text } from "@/components/ui/text"

type InputRef = React.RefObject<TextInput | null>

type FocusEvent = Parameters<NonNullable<TextInputProps["onFocus"]>>[0]

type BlurEvent = Parameters<NonNullable<TextInputProps["onBlur"]>>[0]

type SubmitEvent = Parameters<NonNullable<TextInputProps["onSubmitEditing"]>>[0]

type InputAccessoryBarContextValue = {
  nativeID: string
  inputs: readonly InputRef[]
  focused: InputRef | null
  register: (input: InputRef) => () => void
  setFocused: (input: InputRef | null) => void
  focusAt: (index: number) => void
  done: () => void
}

const InputAccessoryBarContext =
  React.createContext<InputAccessoryBarContextValue | null>(null)

function useInputAccessoryBarContext() {
  const context = React.useContext(InputAccessoryBarContext)
  if (!context) {
    throw new Error(
      "useInputAccessoryBarInput must be used within an <InputAccessoryBar />"
    )
  }
  return context
}

const BAR_HEIGHT = 44

function InputAccessoryBarView({
  previousLabel,
  nextLabel,
  doneLabel,
  className,
}: {
  previousLabel: string
  nextLabel: string
  doneLabel: React.ReactNode
  className?: string
}) {
  const { inputs, focused, focusAt, done } = useInputAccessoryBarContext()
  const index = focused ? inputs.indexOf(focused) : -1
  return (
    <View
      className={cn(
        "h-11 flex-row items-center border-t border-separator bg-surface-raised px-1 dark:bg-surface-secondary",
        className
      )}
    >
      <Button
        variant="ghost"
        size="icon"
        accessibilityLabel={previousLabel}
        disabled={index <= 0}
        onPress={() => focusAt(index - 1)}
      >
        <Icon as={CaretUpIcon} className="size-5" />
      </Button>
      <Button
        variant="ghost"
        size="icon"
        accessibilityLabel={nextLabel}
        disabled={index < 0 || index >= inputs.length - 1}
        onPress={() => focusAt(index + 1)}
      >
        <Icon as={CaretDownIcon} className="size-5" />
      </Button>
      <View className="flex-1" />
      <Button variant="plain" onPress={done}>
        {typeof doneLabel === "string" || typeof doneLabel === "number" ? (
          <Text className="font-semibold">{doneLabel}</Text>
        ) : (
          doneLabel
        )}
      </Button>
    </View>
  )
}

function InputAccessoryBar({
  previousLabel = "Previous",
  nextLabel = "Next",
  doneLabel = "Done",
  onDone,
  portalHost,
  className,
  children,
}: {
  previousLabel?: string
  nextLabel?: string
  doneLabel?: React.ReactNode
  onDone?: () => void
  portalHost?: string
  className?: string
  children?: React.ReactNode
}) {
  const nativeID = `input-accessory-bar-${React.useId()}`
  const [inputs, setInputs] = React.useState<readonly InputRef[]>([])
  const [focused, setFocused] = React.useState<InputRef | null>(null)
  const keyboard = useKeyboard()
  const visible =
    Platform.OS !== "ios" && focused !== null && keyboard.height > 0

  const register = React.useCallback((input: InputRef) => {
    setInputs((current) => [...current, input])
    return () => {
      setInputs((current) => current.filter((entry) => entry !== input))
      setFocused((current) => (current === input ? null : current))
    }
  }, [])

  const focusAt = React.useCallback(
    (index: number) => {
      inputs[index]?.current?.focus()
    },
    [inputs]
  )

  const done = React.useCallback(() => {
    Keyboard.dismiss()
    onDone?.()
  }, [onDone])

  React.useEffect(() => {
    if (Platform.OS === "ios") return
    setKeyboardAccessoryHeight(visible ? BAR_HEIGHT : 0)
  }, [visible])

  React.useEffect(
    () => () => {
      if (Platform.OS !== "ios") setKeyboardAccessoryHeight(0)
    },
    []
  )

  const context = React.useMemo(
    () => ({
      nativeID,
      inputs,
      focused,
      register,
      setFocused,
      focusAt,
      done,
    }),
    [nativeID, inputs, focused, register, focusAt, done]
  )

  const bar = (
    <InputAccessoryBarView
      previousLabel={previousLabel}
      nextLabel={nextLabel}
      doneLabel={doneLabel}
      className={className}
    />
  )

  return (
    <InputAccessoryBarContext.Provider value={context}>
      {children}
      {Platform.OS === "ios" ? (
        <InputAccessoryView nativeID={nativeID}>{bar}</InputAccessoryView>
      ) : (
        <Portal name={nativeID} hostName={portalHost}>
          {visible ? (
            <InputAccessoryBarContext.Provider value={context}>
              <View
                className="absolute inset-x-0 z-50"
                style={{ bottom: keyboard.height - keyboard.accessoryHeight }}
              >
                {bar}
              </View>
            </InputAccessoryBarContext.Provider>
          ) : null}
        </Portal>
      )}
    </InputAccessoryBarContext.Provider>
  )
}

function useInputAccessoryBarInput({
  ref,
  onFocus,
  onBlur,
  onSubmitEditing,
}: {
  ref?: React.Ref<TextInput>
  onFocus?: TextInputProps["onFocus"]
  onBlur?: TextInputProps["onBlur"]
  onSubmitEditing?: TextInputProps["onSubmitEditing"]
} = {}) {
  const { nativeID, inputs, register, setFocused, focusAt, done } =
    useInputAccessoryBarContext()
  const scrollView = React.useContext(KeyboardScrollViewContext)
  const inputRef = React.useRef<TextInput>(null)
  const composedRef = useComposedRefs(ref, inputRef)

  React.useEffect(() => register(inputRef), [register])

  const index = inputs.indexOf(inputRef)
  const last = index === inputs.length - 1

  return {
    ref: composedRef,
    inputAccessoryViewID: nativeID,
    returnKeyType: last ? "done" : "next",
    submitBehavior: last ? "blurAndSubmit" : "submit",
    onFocus: (event: FocusEvent) => {
      setFocused(inputRef)
      if (scrollView) setTimeout(scrollView.scrollToFocused, 50)
      onFocus?.(event)
    },
    onBlur: (event: BlurEvent) => {
      setFocused(null)
      onBlur?.(event)
    },
    onSubmitEditing: (event: SubmitEvent) => {
      if (last) done()
      else focusAt(index + 1)
      onSubmitEditing?.(event)
    },
  } satisfies TextInputProps & { ref: React.Ref<TextInput> }
}

function InputAccessoryBarInput({
  ref,
  onFocus,
  onBlur,
  onSubmitEditing,
  ...props
}: React.ComponentProps<typeof Input>) {
  const accessory = useInputAccessoryBarInput({
    ref,
    onFocus,
    onBlur,
    onSubmitEditing,
  })
  return (
    <Input
      returnKeyType={accessory.returnKeyType}
      submitBehavior={accessory.submitBehavior}
      {...props}
      ref={accessory.ref}
      inputAccessoryViewID={accessory.inputAccessoryViewID}
      onFocus={accessory.onFocus}
      onBlur={accessory.onBlur}
      onSubmitEditing={accessory.onSubmitEditing}
    />
  )
}

export { InputAccessoryBar, InputAccessoryBarInput, useInputAccessoryBarInput }
```

4. Update the import paths to match your project.

**NativeWind**

1. Install the dependencies:

```bash title="Terminal"
npx expo install cn phosphor-react-native react-native-svg
```

2. Add the pieces it builds on: [Button](/docs/components/button), [Icon](/docs/components/icon), [Input](/docs/components/input), [Keyboard Scroll View](/docs/components/keyboard-scroll-view), [Text](/docs/components/text), and the primitives `components/primitives/hooks.tsx`, `components/primitives/keyboard.tsx`, `components/primitives/portal.tsx`.

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

```tsx title="nativewind/components/ui/input-accessory-bar.tsx"
import { cn } from "cn"
import { CaretDownIcon, CaretUpIcon } from "phosphor-react-native"
import * as React from "react"
import {
  InputAccessoryView,
  Keyboard,
  Platform,
  type TextInput,
  type TextInputProps,
  View,
} from "react-native"
import { useComposedRefs } from "@/components/primitives/hooks"
import {
  setKeyboardAccessoryHeight,
  useKeyboard,
} from "@/components/primitives/keyboard"
import { Portal } from "@/components/primitives/portal"
import { Button } from "@/components/ui/button"
import { Icon } from "@/components/ui/icon"
import { Input } from "@/components/ui/input"
import { KeyboardScrollViewContext } from "@/components/ui/keyboard-scroll-view"
import { Text } from "@/components/ui/text"

type InputRef = React.RefObject<TextInput | null>

type FocusEvent = Parameters<NonNullable<TextInputProps["onFocus"]>>[0]

type BlurEvent = Parameters<NonNullable<TextInputProps["onBlur"]>>[0]

type SubmitEvent = Parameters<NonNullable<TextInputProps["onSubmitEditing"]>>[0]

type InputAccessoryBarContextValue = {
  nativeID: string
  inputs: readonly InputRef[]
  focused: InputRef | null
  register: (input: InputRef) => () => void
  setFocused: (input: InputRef | null) => void
  focusAt: (index: number) => void
  done: () => void
}

const InputAccessoryBarContext =
  React.createContext<InputAccessoryBarContextValue | null>(null)

function useInputAccessoryBarContext() {
  const context = React.useContext(InputAccessoryBarContext)
  if (!context) {
    throw new Error(
      "useInputAccessoryBarInput must be used within an <InputAccessoryBar />"
    )
  }
  return context
}

const BAR_HEIGHT = 44

function InputAccessoryBarView({
  previousLabel,
  nextLabel,
  doneLabel,
  className,
}: {
  previousLabel: string
  nextLabel: string
  doneLabel: React.ReactNode
  className?: string
}) {
  const { inputs, focused, focusAt, done } = useInputAccessoryBarContext()
  const index = focused ? inputs.indexOf(focused) : -1
  return (
    <View
      className={cn(
        "h-11 flex-row items-center border-t border-separator bg-surface-raised px-1 dark:bg-surface-secondary",
        className
      )}
    >
      <Button
        variant="ghost"
        size="icon"
        accessibilityLabel={previousLabel}
        disabled={index <= 0}
        onPress={() => focusAt(index - 1)}
      >
        <Icon as={CaretUpIcon} className="size-5" />
      </Button>
      <Button
        variant="ghost"
        size="icon"
        accessibilityLabel={nextLabel}
        disabled={index < 0 || index >= inputs.length - 1}
        onPress={() => focusAt(index + 1)}
      >
        <Icon as={CaretDownIcon} className="size-5" />
      </Button>
      <View className="flex-1" />
      <Button variant="plain" onPress={done}>
        {typeof doneLabel === "string" || typeof doneLabel === "number" ? (
          <Text className="font-semibold">{doneLabel}</Text>
        ) : (
          doneLabel
        )}
      </Button>
    </View>
  )
}

function InputAccessoryBar({
  previousLabel = "Previous",
  nextLabel = "Next",
  doneLabel = "Done",
  onDone,
  portalHost,
  className,
  children,
}: {
  previousLabel?: string
  nextLabel?: string
  doneLabel?: React.ReactNode
  onDone?: () => void
  portalHost?: string
  className?: string
  children?: React.ReactNode
}) {
  const nativeID = `input-accessory-bar-${React.useId()}`
  const [inputs, setInputs] = React.useState<readonly InputRef[]>([])
  const [focused, setFocused] = React.useState<InputRef | null>(null)
  const keyboard = useKeyboard()
  const visible =
    Platform.OS !== "ios" && focused !== null && keyboard.height > 0

  const register = React.useCallback((input: InputRef) => {
    setInputs((current) => [...current, input])
    return () => {
      setInputs((current) => current.filter((entry) => entry !== input))
      setFocused((current) => (current === input ? null : current))
    }
  }, [])

  const focusAt = React.useCallback(
    (index: number) => {
      inputs[index]?.current?.focus()
    },
    [inputs]
  )

  const done = React.useCallback(() => {
    Keyboard.dismiss()
    onDone?.()
  }, [onDone])

  React.useEffect(() => {
    if (Platform.OS === "ios") return
    setKeyboardAccessoryHeight(visible ? BAR_HEIGHT : 0)
  }, [visible])

  React.useEffect(
    () => () => {
      if (Platform.OS !== "ios") setKeyboardAccessoryHeight(0)
    },
    []
  )

  const context = React.useMemo(
    () => ({
      nativeID,
      inputs,
      focused,
      register,
      setFocused,
      focusAt,
      done,
    }),
    [nativeID, inputs, focused, register, focusAt, done]
  )

  const bar = (
    <InputAccessoryBarView
      previousLabel={previousLabel}
      nextLabel={nextLabel}
      doneLabel={doneLabel}
      className={className}
    />
  )

  return (
    <InputAccessoryBarContext.Provider value={context}>
      {children}
      {Platform.OS === "ios" ? (
        <InputAccessoryView nativeID={nativeID}>{bar}</InputAccessoryView>
      ) : (
        <Portal name={nativeID} hostName={portalHost}>
          {visible ? (
            <InputAccessoryBarContext.Provider value={context}>
              <View
                className="absolute inset-x-0 z-50"
                style={{ bottom: keyboard.height - keyboard.accessoryHeight }}
              >
                {bar}
              </View>
            </InputAccessoryBarContext.Provider>
          ) : null}
        </Portal>
      )}
    </InputAccessoryBarContext.Provider>
  )
}

function useInputAccessoryBarInput({
  ref,
  onFocus,
  onBlur,
  onSubmitEditing,
}: {
  ref?: React.Ref<TextInput>
  onFocus?: TextInputProps["onFocus"]
  onBlur?: TextInputProps["onBlur"]
  onSubmitEditing?: TextInputProps["onSubmitEditing"]
} = {}) {
  const { nativeID, inputs, register, setFocused, focusAt, done } =
    useInputAccessoryBarContext()
  const scrollView = React.useContext(KeyboardScrollViewContext)
  const inputRef = React.useRef<TextInput>(null)
  const composedRef = useComposedRefs(ref, inputRef)

  React.useEffect(() => register(inputRef), [register])

  const index = inputs.indexOf(inputRef)
  const last = index === inputs.length - 1

  return {
    ref: composedRef,
    inputAccessoryViewID: nativeID,
    returnKeyType: last ? "done" : "next",
    submitBehavior: last ? "blurAndSubmit" : "submit",
    onFocus: (event: FocusEvent) => {
      setFocused(inputRef)
      if (scrollView) setTimeout(scrollView.scrollToFocused, 50)
      onFocus?.(event)
    },
    onBlur: (event: BlurEvent) => {
      setFocused(null)
      onBlur?.(event)
    },
    onSubmitEditing: (event: SubmitEvent) => {
      if (last) done()
      else focusAt(index + 1)
      onSubmitEditing?.(event)
    },
  } satisfies TextInputProps & { ref: React.Ref<TextInput> }
}

function InputAccessoryBarInput({
  ref,
  onFocus,
  onBlur,
  onSubmitEditing,
  ...props
}: React.ComponentProps<typeof Input>) {
  const accessory = useInputAccessoryBarInput({
    ref,
    onFocus,
    onBlur,
    onSubmitEditing,
  })
  return (
    <Input
      returnKeyType={accessory.returnKeyType}
      submitBehavior={accessory.submitBehavior}
      {...props}
      ref={accessory.ref}
      inputAccessoryViewID={accessory.inputAccessoryViewID}
      onFocus={accessory.onFocus}
      onBlur={accessory.onBlur}
      onSubmitEditing={accessory.onSubmitEditing}
    />
  )
}

export { InputAccessoryBar, InputAccessoryBarInput, useInputAccessoryBarInput }
```

4. Update the import paths to match your project.

**StyleSheet**

1. Install the dependencies:

```bash title="Terminal"
npx expo install phosphor-react-native react-native-svg
```

2. Add the pieces it builds on: [Button](/docs/components/button), [Icon](/docs/components/icon), [Input](/docs/components/input), [Keyboard Scroll View](/docs/components/keyboard-scroll-view), [Text](/docs/components/text), and the primitives `components/primitives/hooks.tsx`, `components/primitives/keyboard.tsx`, `components/primitives/portal.tsx`.

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

```tsx title="stylesheet/components/ui/input-accessory-bar.tsx"
import { CaretDownIcon, CaretUpIcon } from "phosphor-react-native"
import * as React from "react"
import {
  InputAccessoryView,
  Keyboard,
  Platform,
  type StyleProp,
  StyleSheet,
  type TextInput,
  type TextInputProps,
  View,
  type ViewStyle,
} from "react-native"
import { useComposedRefs } from "@/components/primitives/hooks"
import {
  setKeyboardAccessoryHeight,
  useKeyboard,
} from "@/components/primitives/keyboard"
import { Portal } from "@/components/primitives/portal"
import { Button } from "@/components/ui/button"
import { Icon } from "@/components/ui/icon"
import { Input } from "@/components/ui/input"
import { KeyboardScrollViewContext } from "@/components/ui/keyboard-scroll-view"
import { Text } from "@/components/ui/text"
import { useTheme } from "@/components/ui/theme"

type InputRef = React.RefObject<TextInput | null>

type FocusEvent = Parameters<NonNullable<TextInputProps["onFocus"]>>[0]

type BlurEvent = Parameters<NonNullable<TextInputProps["onBlur"]>>[0]

type SubmitEvent = Parameters<NonNullable<TextInputProps["onSubmitEditing"]>>[0]

type InputAccessoryBarContextValue = {
  nativeID: string
  inputs: readonly InputRef[]
  focused: InputRef | null
  register: (input: InputRef) => () => void
  setFocused: (input: InputRef | null) => void
  focusAt: (index: number) => void
  done: () => void
}

const InputAccessoryBarContext =
  React.createContext<InputAccessoryBarContextValue | null>(null)

function useInputAccessoryBarContext() {
  const context = React.useContext(InputAccessoryBarContext)
  if (!context) {
    throw new Error(
      "useInputAccessoryBarInput must be used within an <InputAccessoryBar />"
    )
  }
  return context
}

const BAR_HEIGHT = 44

const styles = StyleSheet.create({
  bar: {
    height: BAR_HEIGHT,
    flexDirection: "row",
    alignItems: "center",
    borderTopWidth: 1,
    paddingHorizontal: 4,
  },
  spacer: { flex: 1 },
  done: { fontWeight: "600" },
  overlay: { position: "absolute", left: 0, right: 0, zIndex: 50 },
})

function InputAccessoryBarView({
  previousLabel,
  nextLabel,
  doneLabel,
  style,
}: {
  previousLabel: string
  nextLabel: string
  doneLabel: React.ReactNode
  style?: StyleProp<ViewStyle>
}) {
  const { colors, isDark } = useTheme()
  const { inputs, focused, focusAt, done } = useInputAccessoryBarContext()
  const index = focused ? inputs.indexOf(focused) : -1
  return (
    <View
      style={[
        styles.bar,
        {
          borderColor: colors.separator,
          backgroundColor: isDark
            ? colors.surfaceSecondary
            : colors.surfaceRaised,
        },
        style,
      ]}
    >
      <Button
        variant="ghost"
        size="icon"
        accessibilityLabel={previousLabel}
        disabled={index <= 0}
        onPress={() => focusAt(index - 1)}
      >
        <Icon as={CaretUpIcon} size={20} />
      </Button>
      <Button
        variant="ghost"
        size="icon"
        accessibilityLabel={nextLabel}
        disabled={index < 0 || index >= inputs.length - 1}
        onPress={() => focusAt(index + 1)}
      >
        <Icon as={CaretDownIcon} size={20} />
      </Button>
      <View style={styles.spacer} />
      <Button variant="plain" onPress={done}>
        {typeof doneLabel === "string" || typeof doneLabel === "number" ? (
          <Text style={styles.done}>{doneLabel}</Text>
        ) : (
          doneLabel
        )}
      </Button>
    </View>
  )
}

function InputAccessoryBar({
  previousLabel = "Previous",
  nextLabel = "Next",
  doneLabel = "Done",
  onDone,
  portalHost,
  style,
  children,
}: {
  previousLabel?: string
  nextLabel?: string
  doneLabel?: React.ReactNode
  onDone?: () => void
  portalHost?: string
  style?: StyleProp<ViewStyle>
  children?: React.ReactNode
}) {
  const nativeID = `input-accessory-bar-${React.useId()}`
  const [inputs, setInputs] = React.useState<readonly InputRef[]>([])
  const [focused, setFocused] = React.useState<InputRef | null>(null)
  const keyboard = useKeyboard()
  const visible =
    Platform.OS !== "ios" && focused !== null && keyboard.height > 0

  const register = React.useCallback((input: InputRef) => {
    setInputs((current) => [...current, input])
    return () => {
      setInputs((current) => current.filter((entry) => entry !== input))
      setFocused((current) => (current === input ? null : current))
    }
  }, [])

  const focusAt = React.useCallback(
    (index: number) => {
      inputs[index]?.current?.focus()
    },
    [inputs]
  )

  const done = React.useCallback(() => {
    Keyboard.dismiss()
    onDone?.()
  }, [onDone])

  React.useEffect(() => {
    if (Platform.OS === "ios") return
    setKeyboardAccessoryHeight(visible ? BAR_HEIGHT : 0)
  }, [visible])

  React.useEffect(
    () => () => {
      if (Platform.OS !== "ios") setKeyboardAccessoryHeight(0)
    },
    []
  )

  const context = React.useMemo(
    () => ({
      nativeID,
      inputs,
      focused,
      register,
      setFocused,
      focusAt,
      done,
    }),
    [nativeID, inputs, focused, register, focusAt, done]
  )

  const bar = (
    <InputAccessoryBarView
      previousLabel={previousLabel}
      nextLabel={nextLabel}
      doneLabel={doneLabel}
      style={style}
    />
  )

  return (
    <InputAccessoryBarContext.Provider value={context}>
      {children}
      {Platform.OS === "ios" ? (
        <InputAccessoryView nativeID={nativeID}>{bar}</InputAccessoryView>
      ) : (
        <Portal name={nativeID} hostName={portalHost}>
          {visible ? (
            <InputAccessoryBarContext.Provider value={context}>
              <View
                style={[
                  styles.overlay,
                  { bottom: keyboard.height - keyboard.accessoryHeight },
                ]}
              >
                {bar}
              </View>
            </InputAccessoryBarContext.Provider>
          ) : null}
        </Portal>
      )}
    </InputAccessoryBarContext.Provider>
  )
}

function useInputAccessoryBarInput({
  ref,
  onFocus,
  onBlur,
  onSubmitEditing,
}: {
  ref?: React.Ref<TextInput>
  onFocus?: TextInputProps["onFocus"]
  onBlur?: TextInputProps["onBlur"]
  onSubmitEditing?: TextInputProps["onSubmitEditing"]
} = {}) {
  const { nativeID, inputs, register, setFocused, focusAt, done } =
    useInputAccessoryBarContext()
  const scrollView = React.useContext(KeyboardScrollViewContext)
  const inputRef = React.useRef<TextInput>(null)
  const composedRef = useComposedRefs(ref, inputRef)

  React.useEffect(() => register(inputRef), [register])

  const index = inputs.indexOf(inputRef)
  const last = index === inputs.length - 1

  return {
    ref: composedRef,
    inputAccessoryViewID: nativeID,
    returnKeyType: last ? "done" : "next",
    submitBehavior: last ? "blurAndSubmit" : "submit",
    onFocus: (event: FocusEvent) => {
      setFocused(inputRef)
      if (scrollView) setTimeout(scrollView.scrollToFocused, 50)
      onFocus?.(event)
    },
    onBlur: (event: BlurEvent) => {
      setFocused(null)
      onBlur?.(event)
    },
    onSubmitEditing: (event: SubmitEvent) => {
      if (last) done()
      else focusAt(index + 1)
      onSubmitEditing?.(event)
    },
  } satisfies TextInputProps & { ref: React.Ref<TextInput> }
}

function InputAccessoryBarInput({
  ref,
  onFocus,
  onBlur,
  onSubmitEditing,
  ...props
}: React.ComponentProps<typeof Input>) {
  const accessory = useInputAccessoryBarInput({
    ref,
    onFocus,
    onBlur,
    onSubmitEditing,
  })
  return (
    <Input
      returnKeyType={accessory.returnKeyType}
      submitBehavior={accessory.submitBehavior}
      {...props}
      ref={accessory.ref}
      inputAccessoryViewID={accessory.inputAccessoryViewID}
      onFocus={accessory.onFocus}
      onBlur={accessory.onBlur}
      onSubmitEditing={accessory.onSubmitEditing}
    />
  )
}

export { InputAccessoryBar, InputAccessoryBarInput, useInputAccessoryBarInput }
```

4. 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/InputAccessoryBar.swift"
import PhosphorSwift
import SwiftUI

struct FocusChain<Value: Hashable> {
  let order: [Value]

  func next(after value: Value?) -> Value? {
    guard let value, let index = order.firstIndex(of: value) else { return order.first }
    let target = order.index(after: index)
    return target < order.endIndex ? order[target] : nil
  }

  func previous(before value: Value?) -> Value? {
    guard let value, let index = order.firstIndex(of: value) else { return nil }
    return index > order.startIndex ? order[order.index(before: index)] : nil
  }
}

public struct InputAccessoryBar: View {
  let previousLabel: LocalizedStringKey
  let nextLabel: LocalizedStringKey
  let doneLabel: LocalizedStringKey
  let onPrevious: (() -> Void)?
  let onNext: (() -> Void)?
  let onDone: () -> Void

  public init(
    previousLabel: LocalizedStringKey = "Previous",
    nextLabel: LocalizedStringKey = "Next",
    doneLabel: LocalizedStringKey = "Done",
    onPrevious: (() -> Void)? = nil,
    onNext: (() -> Void)? = nil,
    onDone: @escaping () -> Void
  ) {
    self.previousLabel = previousLabel
    self.nextLabel = nextLabel
    self.doneLabel = doneLabel
    self.onPrevious = onPrevious
    self.onNext = onNext
    self.onDone = onDone
  }

  public var body: some View {
    HStack(spacing: 0) {
      arrow(Ph.caretUp.bold, label: previousLabel, action: onPrevious)
      arrow(Ph.caretDown.bold, label: nextLabel, action: onNext)
      Spacer(minLength: 0)
      Button(action: onDone) {
        Text(doneLabel)
          .scaledFont(.base, weight: .semibold)
          .foregroundStyle(Color.link)
          .padding(.horizontal, 16)
          .frame(minHeight: 44)
          .contentShape(Rectangle())
      }
      .buttonStyle(.plain)
    }
    .padding(.horizontal, 4)
    .frame(height: 44)
    .frame(maxWidth: .infinity)
    .background(Color.surfaceSecondary)
    .overlay(alignment: .top) {
      Color.separator.frame(height: 1)
    }
    .accessibilityElement(children: .contain)
  }

  private func arrow(_ icon: Image, label: LocalizedStringKey, action: (() -> Void)?) -> some View {
    Button {
      action?()
    } label: {
      EmptyView()
    }
    .buttonStyle(PressReader { pressed in
      icon
        .frame(width: 18, height: 18)
        .foregroundStyle(action == nil ? Color.labelQuaternary : pressed ? .labelSecondary : .link)
        .frame(width: 44, height: 44)
        .contentShape(Rectangle())
    })
    .disabled(action == nil)
    .accessibilityLabel(Text(label))
  }
}

private struct InputAccessoryBarModifier<Value: Hashable>: ViewModifier {
  let focus: FocusState<Value?>.Binding
  let chain: FocusChain<Value>
  let previousLabel: LocalizedStringKey
  let nextLabel: LocalizedStringKey
  let doneLabel: LocalizedStringKey

  func body(content: Content) -> some View {
    let current = focus.wrappedValue
    let previous = chain.previous(before: current)
    let next = chain.next(after: current)
    content
      .onSubmit {
        focus.wrappedValue = chain.next(after: focus.wrappedValue)
      }
      .safeAreaInset(edge: .bottom, spacing: 0) {
        if let current, chain.order.contains(current) {
          InputAccessoryBar(
            previousLabel: previousLabel,
            nextLabel: nextLabel,
            doneLabel: doneLabel,
            onPrevious: previous.map { target in { focus.wrappedValue = target } },
            onNext: next.map { target in { focus.wrappedValue = target } },
            onDone: { focus.wrappedValue = nil }
          )
          .transition(.opacity)
        }
      }
  }
}

extension View {
  public func inputAccessoryBar<Value: Hashable>(
    focus: FocusState<Value?>.Binding,
    order: [Value],
    previousLabel: LocalizedStringKey = "Previous",
    nextLabel: LocalizedStringKey = "Next",
    doneLabel: LocalizedStringKey = "Done"
  ) -> some View {
    modifier(
      InputAccessoryBarModifier(
        focus: focus,
        chain: FocusChain(order: order),
        previousLabel: previousLabel,
        nextLabel: nextLabel,
        doneLabel: doneLabel
      )
    )
  }
}
```

```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")
implementation("com.adamglin:phosphor-icon-android:1.0.0")
```

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

import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.WindowInsets
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.ime
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.relocation.BringIntoViewRequester
import androidx.compose.foundation.relocation.bringIntoViewRequester
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.DisposableEffect
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.SideEffect
import androidx.compose.runtime.Stable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.mutableStateMapOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.composed
import androidx.compose.ui.draw.drawBehind
import androidx.compose.ui.focus.FocusRequester
import androidx.compose.ui.focus.focusRequester
import androidx.compose.ui.focus.onFocusChanged
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Rect
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.layout.onSizeChanged
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.platform.LocalFocusManager
import androidx.compose.ui.platform.LocalWindowInfo
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.IntOffset
import androidx.compose.ui.unit.IntRect
import androidx.compose.ui.unit.IntSize
import androidx.compose.ui.unit.LayoutDirection
import androidx.compose.ui.unit.dp
import androidx.compose.ui.window.Popup
import androidx.compose.ui.window.PopupPositionProvider
import androidx.compose.ui.window.PopupProperties
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.CaretDown
import com.adamglin.phosphoricons.regular.CaretUp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography

private val InputAccessoryBarHeight = 44.dp

@Stable
class InputAccessoryState {
    private val requesters = mutableStateMapOf<Int, FocusRequester>()
    internal var focused by mutableStateOf<Int?>(null)
    internal var barHeight by mutableIntStateOf(0)

    internal fun register(index: Int, requester: FocusRequester) {
        requesters[index] = requester
    }

    internal fun unregister(index: Int, requester: FocusRequester) {
        if (requesters[index] == requester) requesters.remove(index)
        if (focused == index) focused = null
    }

    internal fun onFocus(index: Int, isFocused: Boolean) {
        if (isFocused) {
            focused = index
        } else if (focused == index) {
            focused = null
        }
    }

    private val order: List<Int>
        get() = requesters.keys.sorted()

    val hasPrevious: Boolean
        get() = focused?.let { current -> order.any { it < current } } ?: false

    val hasNext: Boolean
        get() = focused?.let { current -> order.any { it > current } } ?: false

    fun previous() {
        val current = focused ?: return
        order.lastOrNull { it < current }?.let { requesters[it]?.requestFocus() }
    }

    fun next() {
        val current = focused ?: return
        order.firstOrNull { it > current }?.let { requesters[it]?.requestFocus() }
    }
}

@Composable
fun rememberInputAccessoryState(): InputAccessoryState = remember { InputAccessoryState() }

fun Modifier.inputAccessory(state: InputAccessoryState, index: Int): Modifier = composed {
    val requester = remember { FocusRequester() }
    val relocation = remember { BringIntoViewRequester() }
    val density = LocalDensity.current
    val keyboard = WindowInsets.ime.getBottom(density)
    var size by remember { mutableStateOf(IntSize.Zero) }
    val focused = state.focused == index
    DisposableEffect(state, index, requester) {
        state.register(index, requester)
        onDispose { state.unregister(index, requester) }
    }
    LaunchedEffect(focused, keyboard > 0, state.barHeight, size) {
        if (!focused || keyboard == 0 || size == IntSize.Zero) return@LaunchedEffect
        val margin = state.barHeight + with(density) { 8.dp.toPx() }
        relocation.bringIntoView(Rect(0f, 0f, size.width.toFloat(), size.height + margin))
    }
    this
        .onSizeChanged { size = it }
        .bringIntoViewRequester(relocation)
        .focusRequester(requester)
        .onFocusChanged { state.onFocus(index, it.isFocused || it.hasFocus) }
}

private class InputAccessoryPosition(private val top: Int) : PopupPositionProvider {
    override fun calculatePosition(
        anchorBounds: IntRect,
        windowSize: IntSize,
        layoutDirection: LayoutDirection,
        popupContentSize: IntSize,
    ): IntOffset = IntOffset(0, top - popupContentSize.height)
}

@Composable
fun InputAccessoryBar(
    state: InputAccessoryState,
    modifier: Modifier = Modifier,
    previousLabel: String = "Previous",
    nextLabel: String = "Next",
    doneLabel: String = "Done",
    onDone: (() -> Unit)? = null,
) {
    val density = LocalDensity.current
    val keyboard = WindowInsets.ime.getBottom(density)
    val container = LocalWindowInfo.current.containerSize
    val focus = LocalFocusManager.current
    val inset = LocalKeyboardAccessory.current
    if (state.focused == null || keyboard == 0 || container.height == 0) {
        SideEffect {
            state.barHeight = 0
            inset?.height = 0
        }
        return
    }
    DisposableEffect(inset) {
        onDispose { inset?.height = 0 }
    }
    val colors = EsuissTheme.colors
    val top = container.height - keyboard
    val provider = remember(top) { InputAccessoryPosition(top) }
    Popup(
        popupPositionProvider = provider,
        properties = PopupProperties(focusable = false, dismissOnBackPress = false, dismissOnClickOutside = false),
    ) {
        Row(
            modifier = modifier
                .width(with(density) { container.width.toDp() })
                .height(InputAccessoryBarHeight)
                .onSizeChanged {
                    state.barHeight = it.height
                    inset?.height = it.height
                }
                .background(colors.surfaceSecondary)
                .drawBehind { drawRect(colors.separator, Offset.Zero, Size(size.width, 1.dp.toPx())) }
                .padding(horizontal = 4.dp),
            verticalAlignment = Alignment.CenterVertically,
            horizontalArrangement = Arrangement.spacedBy(0.dp),
        ) {
            Button(
                onClick = { state.previous() },
                variant = ButtonVariant.Plain,
                size = ButtonSize.Icon,
                enabled = state.hasPrevious,
            ) {
                Icon(PhosphorIcons.Regular.CaretUp, contentDescription = previousLabel, size = 20.dp)
            }
            Button(
                onClick = { state.next() },
                variant = ButtonVariant.Plain,
                size = ButtonSize.Icon,
                enabled = state.hasNext,
            ) {
                Icon(PhosphorIcons.Regular.CaretDown, contentDescription = nextLabel, size = 20.dp)
            }
            Spacer(Modifier.weight(1f))
            Button(
                onClick = {
                    onDone?.invoke()
                    focus.clearFocus()
                },
                variant = ButtonVariant.Plain,
            ) {
                BasicText(
                    doneLabel,
                    style = Typography.base.copy(color = colors.link, fontWeight = FontWeight.SemiBold),
                    maxLines = 1,
                )
            }
        }
    }
}
```

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

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

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

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

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

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

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

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

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

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

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

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

enum class ButtonGroupOrientation { Horizontal, Vertical }

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

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

internal object ButtonGroupFill

private object ButtonGroupDivider

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

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

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

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

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

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

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

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

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

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

val LocalContentStyle = compositionLocalOf { TextStyle.Default }

val LocalContentColor = compositionLocalOf { Color.Unspecified }

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

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

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

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

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

import android.app.Activity
import android.content.Context
import android.content.ContextWrapper
import android.os.Build
import android.view.View
import android.view.Window
import android.view.WindowInsetsController
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.BoxScope
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.ExperimentalLayoutApi
import androidx.compose.foundation.layout.ColumnScope
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.WindowInsets
import androidx.compose.foundation.layout.WindowInsetsSides
import androidx.compose.foundation.layout.displayCutout
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.only
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.statusBarsIgnoringVisibility
import androidx.compose.foundation.layout.systemBars
import androidx.compose.foundation.layout.union
import androidx.compose.foundation.layout.windowInsetsPadding
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.verticalScroll
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.SideEffect
import androidx.compose.runtime.Stable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalView
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography

@Stable
internal class KeyboardAccessoryInset {
    var height by mutableIntStateOf(0)
}

internal val LocalKeyboardAccessory = staticCompositionLocalOf<KeyboardAccessoryInset?> { null }

enum class ScreenEdge { Top, Bottom, Left, Right }

enum class ScreenVariant { Default, Secondary }

private val AllScreenEdges = setOf(ScreenEdge.Top, ScreenEdge.Bottom, ScreenEdge.Left, ScreenEdge.Right)

private fun Set<ScreenEdge>.sides(): WindowInsetsSides? = map {
    when (it) {
        ScreenEdge.Top -> WindowInsetsSides.Top
        ScreenEdge.Bottom -> WindowInsetsSides.Bottom
        ScreenEdge.Left -> WindowInsetsSides.Left
        ScreenEdge.Right -> WindowInsetsSides.Right
    }
}.reduceOrNull { sides, side -> sides + side }

internal tailrec fun Context.findActivity(): Activity? = when (this) {
    is Activity -> this
    is ContextWrapper -> baseContext.findActivity()
    else -> null
}

@Suppress("DEPRECATION")
private fun Window.applyLightBars(light: Boolean) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
        val mask = WindowInsetsController.APPEARANCE_LIGHT_STATUS_BARS or WindowInsetsController.APPEARANCE_LIGHT_NAVIGATION_BARS
        insetsController?.setSystemBarsAppearance(if (light) mask else 0, mask)
        return
    }
    var flags = decorView.systemUiVisibility
    flags = if (light) flags or View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR else flags and View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR.inv()
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        flags = if (light) flags or View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR else flags and View.SYSTEM_UI_FLAG_LIGHT_NAVIGATION_BAR.inv()
    }
    if (decorView.systemUiVisibility != flags) decorView.systemUiVisibility = flags
}

@OptIn(ExperimentalLayoutApi::class)
@Composable
fun Screen(
    modifier: Modifier = Modifier,
    edges: Set<ScreenEdge> = AllScreenEdges,
    variant: ScreenVariant = ScreenVariant.Default,
    content: @Composable BoxScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val view = LocalView.current
    val light = !colors.isDark
    SideEffect {
        if (!view.isInEditMode) view.context.findActivity()?.window?.applyLightBars(light)
    }
    val sides = edges.sides()
    val accessory = remember { KeyboardAccessoryInset() }
    val fill = when (variant) {
        ScreenVariant.Default -> colors.surface
        ScreenVariant.Secondary -> colors.surfaceSecondary
    }
    Box(
        modifier = modifier
            .fillMaxSize()
            .background(fill)
            .then(
                if (sides != null) {
                    Modifier.windowInsetsPadding(WindowInsets.systemBars.union(WindowInsets.displayCutout).union(WindowInsets.statusBarsIgnoringVisibility).only(sides))
                } else {
                    Modifier
                },
            ),
    ) {
        CompositionLocalProvider(
            LocalKeyboardAccessory provides accessory,
            LocalContentStyle provides Typography.base.copy(color = colors.label),
            LocalContentColor provides colors.label,
        ) {
            content()
        }
    }
}

@Composable
fun ScreenContent(
    modifier: Modifier = Modifier,
    scrollable: Boolean = false,
    contentPadding: PaddingValues = PaddingValues(16.dp),
    verticalArrangement: Arrangement.Vertical = Arrangement.spacedBy(16.dp),
    content: @Composable ColumnScope.() -> Unit,
) {
    Column(
        modifier = modifier
            .fillMaxWidth()
            .then(if (scrollable) Modifier.verticalScroll(rememberScrollState()) else Modifier)
            .padding(contentPadding),
        verticalArrangement = verticalArrangement,
        content = content,
    )
}
```

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

## Usage

```tsx
import { InputAccessoryBar, InputAccessoryBarInput } from "@/components/ui/input-accessory-bar"
```

```tsx
<InputAccessoryBar>
  <Form />
</InputAccessoryBar>
```

Wrap the form in `InputAccessoryBar` and use `InputAccessoryBarInput` in place of `Input`. Inputs are ordered by the order they mount. The return key reads "next" on every input but the last, which reads "done" and dismisses the keyboard.

For other text inputs, such as a `Textarea`, call `useInputAccessoryBarInput()` and spread the returned props onto the input. Inside a Keyboard Scroll View, the focused input is scrolled into view.

Use `previousLabel`, `nextLabel` and `doneLabel` to localize the buttons, and `onDone` to react when done is pressed.

## Examples

### Focused

The first input focused, so the bar is visible.

![Preview](https://uim.suiss.app/previews/components-input-accessory-bar--focused.light.webp)

```tsx
import { View } from "react-native"
import { InputAccessoryBar, InputAccessoryBarInput } from "@/components/ui/input-accessory-bar"
import { KeyboardScrollView } from "@/components/ui/keyboard-scroll-view"
import { Text } from "@/components/ui/text"

function Field({ label, autoFocus }: { label: string; autoFocus?: boolean }) {
  return (
    <View className="gap-1.5">
      <Text variant="small">{label}</Text>
      <InputAccessoryBarInput placeholder={label} autoFocus={autoFocus} />
    </View>
  )
}

function Form({ autoFocus = false }: { autoFocus?: boolean }) {
  return (
    <KeyboardScrollView className="-m-4" contentContainerClassName="gap-4 p-4">
      <Field label="Name" autoFocus={autoFocus} />
      <Field label="Email" />
      <Field label="Phone" />
      <Field label="City" />
    </KeyboardScrollView>
  )
}

export function InputAccessoryBarFocusedExample() {
  return (
    <InputAccessoryBar>
      <Form autoFocus />
    </InputAccessoryBar>
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct InputAccessoryBarFocusedExample: View {
  var body: some View {
    InputAccessoryBarForm(autoFocus: true)
  }
}

enum InputAccessoryBarField: Hashable {
  case name, email, phone, city, subject, message
}

struct InputAccessoryBarRow: View {
  let label: LocalizedStringKey
  let field: InputAccessoryBarField
  let focus: FocusState<InputAccessoryBarField?>.Binding

  @State private var text = ""

  var body: some View {
    VStack(alignment: .leading, spacing: 6) {
      Text(label)
        .textVariant(.small)
        .accessibilityHidden(true)
      TextField(label, text: $text)
        .textFieldStyle(.input)
        .focused(focus, equals: field)
        .submitLabel(.next)
    }
  }
}

struct InputAccessoryBarForm: View {
  var autoFocus = false
  var previousLabel: LocalizedStringKey = "Previous"
  var nextLabel: LocalizedStringKey = "Next"
  var doneLabel: LocalizedStringKey = "Done"

  @FocusState private var focus: InputAccessoryBarField?

  var body: some View {
    KeyboardScrollView {
      VStack(alignment: .leading, spacing: 16) {
        InputAccessoryBarRow(label: "Name", field: .name, focus: $focus)
        InputAccessoryBarRow(label: "Email", field: .email, focus: $focus)
        InputAccessoryBarRow(label: "Phone", field: .phone, focus: $focus)
        InputAccessoryBarRow(label: "City", field: .city, focus: $focus)
      }
      .padding(16)
    }
    .inputAccessoryBar(
      focus: $focus,
      order: [.name, .email, .phone, .city],
      previousLabel: previousLabel,
      nextLabel: nextLabel,
      doneLabel: doneLabel
    )
    .onAppear {
      if autoFocus { focus = .name }
    }
  }
}
```

```kotlin
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.focus.FocusRequester
import androidx.compose.ui.focus.focusRequester
import androidx.compose.ui.unit.dp
import com.esuiss.ui.components.Input
import com.esuiss.ui.components.InputAccessoryBar
import com.esuiss.ui.components.InputAccessoryState
import com.esuiss.ui.components.KeyboardScrollView
import com.esuiss.ui.components.Screen
import com.esuiss.ui.components.Text
import com.esuiss.ui.components.TextVariant
import com.esuiss.ui.components.inputAccessory
import com.esuiss.ui.components.rememberInputAccessoryState

@Composable
fun InputAccessoryBarFocusedExample() {
    InputAccessoryBarForm(autoFocus = true)
}

@Composable
fun InputAccessoryBarField(
    label: String,
    state: InputAccessoryState,
    index: Int,
    autoFocus: Boolean = false,
) {
    var value by rememberSaveable(label) { mutableStateOf("") }
    val requester = remember { FocusRequester() }
    if (autoFocus) {
        LaunchedEffect(Unit) { requester.requestFocus() }
    }
    Column(Modifier.fillMaxWidth(), verticalArrangement = Arrangement.spacedBy(6.dp)) {
        Text(label, variant = TextVariant.Small)
        Input(
            value,
            { value = it },
            Modifier.focusRequester(requester).inputAccessory(state, index),
            placeholder = label,
        )
    }
}

@Composable
fun InputAccessoryBarForm(
    autoFocus: Boolean,
    previousLabel: String = "Previous",
    nextLabel: String = "Next",
    doneLabel: String = "Done",
) {
    val state = rememberInputAccessoryState()
    Screen {
        KeyboardScrollView(
            modifier = Modifier.fillMaxSize(),
            contentPadding = PaddingValues(16.dp),
            verticalArrangement = Arrangement.spacedBy(16.dp),
        ) {
            InputAccessoryBarField("Name", state, 0, autoFocus)
            InputAccessoryBarField("Email", state, 1)
            InputAccessoryBarField("Phone", state, 2)
            InputAccessoryBarField("City", state, 3)
        }
        InputAccessoryBar(state, previousLabel = previousLabel, nextLabel = nextLabel, doneLabel = doneLabel)
    }
}
```

### Custom labels

Custom labels for the previous, next and done buttons.

![Preview](https://uim.suiss.app/previews/components-input-accessory-bar--custom-labels.light.webp)

```tsx
import { View } from "react-native"
import { InputAccessoryBar, InputAccessoryBarInput } from "@/components/ui/input-accessory-bar"
import { KeyboardScrollView } from "@/components/ui/keyboard-scroll-view"
import { Text } from "@/components/ui/text"

function Field({ label, autoFocus }: { label: string; autoFocus?: boolean }) {
  return (
    <View className="gap-1.5">
      <Text variant="small">{label}</Text>
      <InputAccessoryBarInput placeholder={label} autoFocus={autoFocus} />
    </View>
  )
}

function Form({ autoFocus = false }: { autoFocus?: boolean }) {
  return (
    <KeyboardScrollView className="-m-4" contentContainerClassName="gap-4 p-4">
      <Field label="Name" autoFocus={autoFocus} />
      <Field label="Email" />
      <Field label="Phone" />
      <Field label="City" />
    </KeyboardScrollView>
  )
}

export function InputAccessoryBarCustomLabelsExample() {
  return (
    <InputAccessoryBar
      previousLabel="Back"
      nextLabel="Forward"
      doneLabel="Close"
    >
      <Form autoFocus />
    </InputAccessoryBar>
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct InputAccessoryBarCustomLabelsExample: View {
  var body: some View {
    InputAccessoryBarForm(autoFocus: true, previousLabel: "Back", nextLabel: "Forward", doneLabel: "Close")
  }
}

enum InputAccessoryBarField: Hashable {
  case name, email, phone, city, subject, message
}

struct InputAccessoryBarRow: View {
  let label: LocalizedStringKey
  let field: InputAccessoryBarField
  let focus: FocusState<InputAccessoryBarField?>.Binding

  @State private var text = ""

  var body: some View {
    VStack(alignment: .leading, spacing: 6) {
      Text(label)
        .textVariant(.small)
        .accessibilityHidden(true)
      TextField(label, text: $text)
        .textFieldStyle(.input)
        .focused(focus, equals: field)
        .submitLabel(.next)
    }
  }
}

struct InputAccessoryBarForm: View {
  var autoFocus = false
  var previousLabel: LocalizedStringKey = "Previous"
  var nextLabel: LocalizedStringKey = "Next"
  var doneLabel: LocalizedStringKey = "Done"

  @FocusState private var focus: InputAccessoryBarField?

  var body: some View {
    KeyboardScrollView {
      VStack(alignment: .leading, spacing: 16) {
        InputAccessoryBarRow(label: "Name", field: .name, focus: $focus)
        InputAccessoryBarRow(label: "Email", field: .email, focus: $focus)
        InputAccessoryBarRow(label: "Phone", field: .phone, focus: $focus)
        InputAccessoryBarRow(label: "City", field: .city, focus: $focus)
      }
      .padding(16)
    }
    .inputAccessoryBar(
      focus: $focus,
      order: [.name, .email, .phone, .city],
      previousLabel: previousLabel,
      nextLabel: nextLabel,
      doneLabel: doneLabel
    )
    .onAppear {
      if autoFocus { focus = .name }
    }
  }
}
```

```kotlin
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.focus.FocusRequester
import androidx.compose.ui.focus.focusRequester
import androidx.compose.ui.unit.dp
import com.esuiss.ui.components.Input
import com.esuiss.ui.components.InputAccessoryBar
import com.esuiss.ui.components.InputAccessoryState
import com.esuiss.ui.components.KeyboardScrollView
import com.esuiss.ui.components.Screen
import com.esuiss.ui.components.Text
import com.esuiss.ui.components.TextVariant
import com.esuiss.ui.components.inputAccessory
import com.esuiss.ui.components.rememberInputAccessoryState

@Composable
fun InputAccessoryBarCustomLabelsExample() {
    InputAccessoryBarForm(autoFocus = true, previousLabel = "Back", nextLabel = "Forward", doneLabel = "Close")
}

@Composable
fun InputAccessoryBarField(
    label: String,
    state: InputAccessoryState,
    index: Int,
    autoFocus: Boolean = false,
) {
    var value by rememberSaveable(label) { mutableStateOf("") }
    val requester = remember { FocusRequester() }
    if (autoFocus) {
        LaunchedEffect(Unit) { requester.requestFocus() }
    }
    Column(Modifier.fillMaxWidth(), verticalArrangement = Arrangement.spacedBy(6.dp)) {
        Text(label, variant = TextVariant.Small)
        Input(
            value,
            { value = it },
            Modifier.focusRequester(requester).inputAccessory(state, index),
            placeholder = label,
        )
    }
}

@Composable
fun InputAccessoryBarForm(
    autoFocus: Boolean,
    previousLabel: String = "Previous",
    nextLabel: String = "Next",
    doneLabel: String = "Done",
) {
    val state = rememberInputAccessoryState()
    Screen {
        KeyboardScrollView(
            modifier = Modifier.fillMaxSize(),
            contentPadding = PaddingValues(16.dp),
            verticalArrangement = Arrangement.spacedBy(16.dp),
        ) {
            InputAccessoryBarField("Name", state, 0, autoFocus)
            InputAccessoryBarField("Email", state, 1)
            InputAccessoryBarField("Phone", state, 2)
            InputAccessoryBarField("City", state, 3)
        }
        InputAccessoryBar(state, previousLabel = previousLabel, nextLabel = nextLabel, doneLabel = doneLabel)
    }
}
```

### With textarea

A textarea connected through `useInputAccessoryBarInput`.

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

```tsx
import * as React from "react"
import { View } from "react-native"
import { InputAccessoryBar, InputAccessoryBarInput, useInputAccessoryBarInput } from "@/components/ui/input-accessory-bar"
import { KeyboardScrollView } from "@/components/ui/keyboard-scroll-view"
import { Text } from "@/components/ui/text"
import { Textarea } from "@/components/ui/textarea"

function Field({ label, autoFocus }: { label: string; autoFocus?: boolean }) {
  return (
    <View className="gap-1.5">
      <Text variant="small">{label}</Text>
      <InputAccessoryBarInput placeholder={label} autoFocus={autoFocus} />
    </View>
  )
}

function MessageField() {
  const accessory = useInputAccessoryBarInput()
  return (
    <View className="gap-1.5">
      <Text variant="small">Message</Text>
      <Textarea
        placeholder="Message"
        ref={accessory.ref}
        inputAccessoryViewID={accessory.inputAccessoryViewID}
        onFocus={accessory.onFocus}
        onBlur={accessory.onBlur}
      />
    </View>
  )
}

function DoneLogDemo() {
  const [log, setLog] = React.useState("Tap Done.")
  return (
    <InputAccessoryBar onDone={() => setLog("Done pressed")}>
      <KeyboardScrollView
        className="-m-4"
        contentContainerClassName="gap-4 p-4"
      >
        <Field label="Subject" autoFocus />
        <MessageField />
        <Text role="status" className="text-sm text-label-secondary">
          {log}
        </Text>
      </KeyboardScrollView>
    </InputAccessoryBar>
  )
}

export function InputAccessoryBarWithTextareaExample() {
  return (
    <DoneLogDemo />
  )
}
```

```swift
import EsuissUI
import SwiftUI

enum InputAccessoryBarField: Hashable {
  case name, email, phone, city, subject, message
}

struct InputAccessoryBarRow: View {
  let label: LocalizedStringKey
  let field: InputAccessoryBarField
  let focus: FocusState<InputAccessoryBarField?>.Binding

  @State private var text = ""

  var body: some View {
    VStack(alignment: .leading, spacing: 6) {
      Text(label)
        .textVariant(.small)
        .accessibilityHidden(true)
      TextField(label, text: $text)
        .textFieldStyle(.input)
        .focused(focus, equals: field)
        .submitLabel(.next)
    }
  }
}

struct InputAccessoryBarTextareaDemo: View {
  @FocusState private var focus: InputAccessoryBarField?
  @State private var message = ""
  @State private var log = "Tap Done."

  var body: some View {
    KeyboardScrollView {
      VStack(alignment: .leading, spacing: 16) {
        InputAccessoryBarRow(label: "Subject", field: .subject, focus: $focus)
        VStack(alignment: .leading, spacing: 6) {
          Text("Message")
            .textVariant(.small)
            .accessibilityHidden(true)
          TextField("Message", text: $message, axis: .vertical)
            .textFieldStyle(.textarea)
            .focused($focus, equals: .message)
        }
        Text(log)
          .textStyle(.sm)
          .foregroundStyle(Color.labelSecondary)
      }
      .padding(16)
    }
    .safeAreaInset(edge: .bottom, spacing: 0) {
      if let current = focus {
        InputAccessoryBar(
          onPrevious: current == .message ? { focus = .subject } : nil,
          onNext: current == .subject ? { focus = .message } : nil,
          onDone: {
            log = "Done pressed"
            focus = nil
          }
        )
      }
    }
    .onSubmit {
      if focus == .subject { focus = .message }
    }
    .onAppear { focus = .subject }
  }
}
```

```kotlin
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.focus.FocusRequester
import androidx.compose.ui.focus.focusRequester
import androidx.compose.ui.semantics.LiveRegionMode
import androidx.compose.ui.semantics.liveRegion
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.unit.dp
import com.esuiss.ui.components.Input
import com.esuiss.ui.components.InputAccessoryBar
import com.esuiss.ui.components.InputAccessoryState
import com.esuiss.ui.components.KeyboardScrollView
import com.esuiss.ui.components.Screen
import com.esuiss.ui.components.Text
import com.esuiss.ui.components.TextVariant
import com.esuiss.ui.components.Textarea
import com.esuiss.ui.components.inputAccessory
import com.esuiss.ui.components.rememberInputAccessoryState
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography

@Composable
fun InputAccessoryBarField(
    label: String,
    state: InputAccessoryState,
    index: Int,
    autoFocus: Boolean = false,
) {
    var value by rememberSaveable(label) { mutableStateOf("") }
    val requester = remember { FocusRequester() }
    if (autoFocus) {
        LaunchedEffect(Unit) { requester.requestFocus() }
    }
    Column(Modifier.fillMaxWidth(), verticalArrangement = Arrangement.spacedBy(6.dp)) {
        Text(label, variant = TextVariant.Small)
        Input(
            value,
            { value = it },
            Modifier.focusRequester(requester).inputAccessory(state, index),
            placeholder = label,
        )
    }
}

@Composable
fun InputAccessoryBarDoneLog() {
    val state = rememberInputAccessoryState()
    var log by rememberSaveable { mutableStateOf("Tap Done.") }
    var message by rememberSaveable { mutableStateOf("") }
    Screen {
        KeyboardScrollView(
            modifier = Modifier.fillMaxSize(),
            contentPadding = PaddingValues(16.dp),
            verticalArrangement = Arrangement.spacedBy(16.dp),
        ) {
            InputAccessoryBarField("Subject", state, 0, autoFocus = true)
            Column(Modifier.fillMaxWidth(), verticalArrangement = Arrangement.spacedBy(6.dp)) {
                Text("Message", variant = TextVariant.Small)
                Textarea(
                    message,
                    { message = it },
                    Modifier.inputAccessory(state, 1),
                    placeholder = "Message",
                )
            }
            Text(
                log,
                modifier = Modifier.semantics { liveRegion = LiveRegionMode.Polite },
                style = Typography.sm.copy(color = EsuissTheme.colors.labelSecondary),
            )
        }
        InputAccessoryBar(state, onDone = { log = "Done pressed" })
    }
}
```

## API Reference

### InputAccessoryBar

Provider that tracks the inputs and renders the bar.

### InputAccessoryBarInput

`Input` connected to the bar.

## Accessibility

- The arrow buttons are labelled with `previousLabel` and `nextLabel` and are disabled at the first and last input.
- The done button is a text button that dismisses the keyboard.

## Notes

- iOS uses the native input accessory view; Android uses a portal and reserves the bar height so keyboard-aware layouts stay above it.
- Uses `bg-surface-raised` (a secondary surface in dark mode) and `border-separator` tokens.