# Amount Input

A large, locale-formatted money display with an on-screen keypad for entering an amount.

Amount Input 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/amount-input

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

```tsx
import { AmountInput } from "@/components/ui/amount-input"

export function AmountInputExample() {
  return (
    <AmountInput currency="USD" locale="en-US" />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct AmountInputExample: View {
  var body: some View {
    AmountInputDemo(currency: "USD", locale: "en-US")
  }
}

struct AmountInputDemo: View {
  let currency: String
  let locale: String
  var max: Double?

  @State private var value: String

  init(currency: String, locale: String, initial: String = "", max: Double? = nil) {
    self.currency = currency
    self.locale = locale
    self.max = max
    _value = State(initialValue: initial)
  }

  var body: some View {
    AmountInput(value: $value, currency: currency, max: max)
      .environment(\.locale, Locale(identifier: locale))
  }
}
```

```kotlin
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import com.esuiss.ui.components.AmountInput
import java.util.Locale

@Composable
fun AmountInputExample() {
    AmountInputStory("USD", "en-US")
}

@Composable
fun AmountInputStory(
    currency: String,
    locale: String,
    defaultValue: String = "",
    max: Double? = null,
    enabled: Boolean = true,
) {
    var value by rememberSaveable { mutableStateOf(defaultValue) }
    AmountInput(
        modifier = Modifier.fillMaxWidth(),
        value = value,
        onValueChange = { next, _ -> value = next },
        currency = currency,
        locale = Locale.forLanguageTag(locale),
        max = max,
        enabled = enabled,
    )
}
```

`AmountInput` combines a big formatted amount with a `Keypad`. The amount is formatted with `Intl.NumberFormat` for the given `locale` and `currency`, the currency symbol is drawn smaller, and the font size steps down as the number gets longer.

The decimal key appears only when the currency allows fractions, using the locale's decimal separator. A key that would exceed the limits is rejected with a shake and an error haptic; accepted keys play a selection haptic.

## Installation

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

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

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

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

### Manual

**Uniwind**

1. Install the dependencies:

```bash title="Terminal"
npx expo install cn react-native-reanimated react-native-worklets
```

2. Add the pieces it builds on: [Keypad](/docs/components/keypad), [Text](/docs/components/text), and the primitives `components/primitives/haptics.tsx`.

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

```tsx title="uniwind/components/ui/amount-input.tsx"
import { cn } from "cn"
import * as React from "react"
import { View } from "react-native"
import {
  ReduceMotion,
  useAnimatedStyle,
  useSharedValue,
  withSequence,
  withTiming,
} from "react-native-reanimated"
import { useHaptics } from "@/components/primitives/haptics"
import { AnimatedView } from "@/components/ui/animated-view"
import { Keypad, type KeypadKeyValue } from "@/components/ui/keypad"
import { Text } from "@/components/ui/text"

type AmountPart = { type: string; value: string }

const MAX_DIGITS = 15

const SHAKE_STEP = 400 / 6

function createFormatter(
  locale: string | undefined,
  currency: string | undefined,
  fractionDigits: number
) {
  const digits = {
    minimumFractionDigits: fractionDigits,
    maximumFractionDigits: fractionDigits,
  }
  try {
    return new Intl.NumberFormat(
      locale,
      currency ? { ...digits, style: "currency", currency } : digits
    )
  } catch {
    return new Intl.NumberFormat(undefined, digits)
  }
}

function toParts(formatter: Intl.NumberFormat, amount: number): AmountPart[] {
  if (typeof formatter.formatToParts === "function") {
    return formatter.formatToParts(amount)
  }
  const text = formatter.format(amount)
  const match = text.match(/^(\D*?)(\d[\d\s.,'\u2019\u00a0\u202f]*\d|\d)(\D*)$/)
  if (!match) return [{ type: "integer", value: text }]
  const [, prefix = "", number = "", suffix = ""] = match
  const parts: AmountPart[] = []
  if (prefix.trim()) parts.push({ type: "currency", value: prefix.trim() })
  if (prefix !== prefix.trimEnd()) parts.push({ type: "literal", value: " " })
  parts.push({ type: "integer", value: number })
  if (suffix !== suffix.trimStart()) parts.push({ type: "literal", value: " " })
  if (suffix.trim()) parts.push({ type: "currency", value: suffix.trim() })
  return parts
}

function currencyFractionDigits(
  locale: string | undefined,
  currency: string | undefined
) {
  if (!currency) return 2
  try {
    return (
      new Intl.NumberFormat(locale, {
        style: "currency",
        currency,
      }).resolvedOptions().maximumFractionDigits ?? 2
    )
  } catch {
    return 2
  }
}

function decimalSeparatorOf(locale: string | undefined) {
  const formatter = createFormatter(locale, undefined, 1)
  const parts = toParts(formatter, 1.5)
  const decimal = parts.find((part) => part.type === "decimal")?.value
  if (decimal) return decimal
  return formatter.format(1.5).match(/1(\D+)5/)?.[1] ?? "."
}

function toAmount(value: string) {
  if (!value || value === ".") return 0
  const amount = Number(value)
  return Number.isFinite(amount) ? amount : 0
}

function sanitize(value: string, fractionDigits: number) {
  const [integer = "", ...rest] = value.replace(/[^\d.]/g, "").split(".")
  const fraction = rest.join("").slice(0, fractionDigits)
  const trimmed = integer.replace(/^0+(?=\d)/, "")
  if (fractionDigits === 0 || rest.length === 0) return trimmed
  return `${trimmed || "0"}.${fraction}`
}

function nextValue(
  current: string,
  key: KeypadKeyValue,
  fractionDigits: number,
  max: number | undefined
) {
  if (key === "biometric") return current
  if (key === "delete") return current.slice(0, -1)
  const [integer = "", fraction] = current.split(".")
  if (key === "decimal") {
    if (fractionDigits === 0 || fraction !== undefined) return current
    return `${integer || "0"}.`
  }
  if (fraction !== undefined && fraction.length >= fractionDigits) {
    return current
  }
  if (integer.length + (fraction?.length ?? 0) >= MAX_DIGITS) return current
  const next =
    fraction === undefined && integer === "0" ? key : `${current}${key}`
  if (max !== undefined && toAmount(next) > max) return current
  return next
}

function formatParts(
  value: string,
  locale: string | undefined,
  currency: string | undefined,
  decimalSeparator: string
) {
  const fraction = value.split(".")[1]
  const fractionDigits = fraction?.length ?? 0
  const parts = toParts(
    createFormatter(locale, currency, fractionDigits),
    toAmount(value)
  )
  if (fraction === undefined || fractionDigits > 0) return parts
  let last = -1
  parts.forEach((part, index) => {
    if (part.type === "integer" || part.type === "group") last = index
  })
  const decimal = { type: "decimal", value: decimalSeparator }
  if (last === -1) return [...parts, decimal]
  return [...parts.slice(0, last + 1), decimal, ...parts.slice(last + 1)]
}

function amountSizeClassName(characters: number) {
  if (characters > 11) return { amount: "text-4xl", symbol: "text-2xl" }
  if (characters > 8) return { amount: "text-5xl", symbol: "text-3xl" }
  return { amount: "text-6xl", symbol: "text-4xl" }
}

function AmountInput({
  value: valueProp,
  defaultValue = "",
  onValueChange,
  currency,
  locale,
  maxFractionDigits: maxFractionDigitsProp,
  max,
  placeholder = "0",
  disabled = false,
  deleteLabel,
  decimalLabel,
  className,
  amountClassName,
  keypadClassName,
  accessibilityLabel,
  ...props
}: React.ComponentProps<typeof View> & {
  value?: string
  defaultValue?: string
  onValueChange?: (value: string, amount: number) => void
  currency?: string
  locale?: string
  maxFractionDigits?: number
  max?: number
  placeholder?: string
  disabled?: boolean
  deleteLabel?: string
  decimalLabel?: string
  amountClassName?: string
  keypadClassName?: string
}) {
  const haptics = useHaptics()
  const maxFractionDigits = Math.max(
    0,
    maxFractionDigitsProp ?? currencyFractionDigits(locale, currency)
  )
  const decimalSeparator = React.useMemo(
    () => decimalSeparatorOf(locale),
    [locale]
  )
  const [uncontrolled, setUncontrolled] = React.useState(() =>
    sanitize(defaultValue, maxFractionDigits)
  )
  const isControlled = valueProp !== undefined
  const value = isControlled ? valueProp : uncontrolled
  const valueRef = React.useRef(value)
  valueRef.current = value

  const offset = useSharedValue(0)

  const reject = () => {
    haptics.notification("error")
    const step = { duration: SHAKE_STEP, reduceMotion: ReduceMotion.System }
    offset.value = withSequence(
      withTiming(-12, step),
      withTiming(10, step),
      withTiming(-8, step),
      withTiming(6, step),
      withTiming(-3, step),
      withTiming(0, step)
    )
  }

  const shakeStyle = useAnimatedStyle(() => ({
    transform: [{ translateX: offset.value }],
  }))

  const press = (key: KeypadKeyValue) => {
    const current = valueRef.current
    const next = nextValue(current, key, maxFractionDigits, max)
    if (next === current) {
      if (key !== "delete" && key !== "biometric" && current !== "0") {
        reject()
      }
      return
    }
    valueRef.current = next
    if (!isControlled) setUncontrolled(next)
    onValueChange?.(next, toAmount(next))
    haptics.selection()
  }

  const empty = value === ""
  const parts = empty
    ? formatParts("0", locale, currency, decimalSeparator).map((part) =>
        part.type === "integer" ? { ...part, value: placeholder } : part
      )
    : formatParts(value, locale, currency, decimalSeparator)
  const text = parts.map((part) => part.value).join("")
  const size = amountSizeClassName(text.length)
  const color = empty || disabled ? "text-label-tertiary" : "text-label"

  return (
    <View className={cn("items-center gap-8", className)} {...props}>
      <AnimatedView
        className="h-18 w-full items-center justify-center px-4"
        style={shakeStyle}
      >
        <Text
          numberOfLines={1}
          adjustsFontSizeToFit
          minimumFontScale={0.5}
          accessibilityLabel={
            accessibilityLabel ? `${accessibilityLabel}, ${text}` : text
          }
          accessibilityLiveRegion="polite"
          className={cn(
            "font-semibold tabular-nums tracking-tight",
            size.amount,
            color,
            amountClassName
          )}
        >
          {parts.map((part) =>
            part.type === "currency" ? (
              <Text
                key="currency"
                className={cn("font-semibold", size.symbol, color)}
              >
                {part.value}
              </Text>
            ) : (
              part.value
            )
          )}
        </Text>
      </AnimatedView>
      <Keypad
        accessoryKey={maxFractionDigits > 0 ? "decimal" : undefined}
        decimalSeparator={decimalSeparator}
        decimalLabel={decimalLabel}
        deleteLabel={deleteLabel}
        disabled={disabled}
        deleteDisabled={empty}
        onKeyPress={press}
        className={keypadClassName}
      />
    </View>
  )
}

export { AmountInput }
```

4. Update the import paths to match your project.

**NativeWind**

1. Install the dependencies:

```bash title="Terminal"
npx expo install cn react-native-reanimated react-native-worklets
```

2. Add the pieces it builds on: [Keypad](/docs/components/keypad), [Text](/docs/components/text), and the primitives `components/primitives/haptics.tsx`.

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

```tsx title="nativewind/components/ui/amount-input.tsx"
import { cn } from "cn"
import * as React from "react"
import { View } from "react-native"
import {
  ReduceMotion,
  useAnimatedStyle,
  useSharedValue,
  withSequence,
  withTiming,
} from "react-native-reanimated"
import { useHaptics } from "@/components/primitives/haptics"
import { AnimatedView } from "@/components/ui/animated-view"
import { Keypad, type KeypadKeyValue } from "@/components/ui/keypad"
import { Text } from "@/components/ui/text"

type AmountPart = { type: string; value: string }

const MAX_DIGITS = 15

const SHAKE_STEP = 400 / 6

function createFormatter(
  locale: string | undefined,
  currency: string | undefined,
  fractionDigits: number
) {
  const digits = {
    minimumFractionDigits: fractionDigits,
    maximumFractionDigits: fractionDigits,
  }
  try {
    return new Intl.NumberFormat(
      locale,
      currency ? { ...digits, style: "currency", currency } : digits
    )
  } catch {
    return new Intl.NumberFormat(undefined, digits)
  }
}

function toParts(formatter: Intl.NumberFormat, amount: number): AmountPart[] {
  if (typeof formatter.formatToParts === "function") {
    return formatter.formatToParts(amount)
  }
  const text = formatter.format(amount)
  const match = text.match(/^(\D*?)(\d[\d\s.,'\u2019\u00a0\u202f]*\d|\d)(\D*)$/)
  if (!match) return [{ type: "integer", value: text }]
  const [, prefix = "", number = "", suffix = ""] = match
  const parts: AmountPart[] = []
  if (prefix.trim()) parts.push({ type: "currency", value: prefix.trim() })
  if (prefix !== prefix.trimEnd()) parts.push({ type: "literal", value: " " })
  parts.push({ type: "integer", value: number })
  if (suffix !== suffix.trimStart()) parts.push({ type: "literal", value: " " })
  if (suffix.trim()) parts.push({ type: "currency", value: suffix.trim() })
  return parts
}

function currencyFractionDigits(
  locale: string | undefined,
  currency: string | undefined
) {
  if (!currency) return 2
  try {
    return (
      new Intl.NumberFormat(locale, {
        style: "currency",
        currency,
      }).resolvedOptions().maximumFractionDigits ?? 2
    )
  } catch {
    return 2
  }
}

function decimalSeparatorOf(locale: string | undefined) {
  const formatter = createFormatter(locale, undefined, 1)
  const parts = toParts(formatter, 1.5)
  const decimal = parts.find((part) => part.type === "decimal")?.value
  if (decimal) return decimal
  return formatter.format(1.5).match(/1(\D+)5/)?.[1] ?? "."
}

function toAmount(value: string) {
  if (!value || value === ".") return 0
  const amount = Number(value)
  return Number.isFinite(amount) ? amount : 0
}

function sanitize(value: string, fractionDigits: number) {
  const [integer = "", ...rest] = value.replace(/[^\d.]/g, "").split(".")
  const fraction = rest.join("").slice(0, fractionDigits)
  const trimmed = integer.replace(/^0+(?=\d)/, "")
  if (fractionDigits === 0 || rest.length === 0) return trimmed
  return `${trimmed || "0"}.${fraction}`
}

function nextValue(
  current: string,
  key: KeypadKeyValue,
  fractionDigits: number,
  max: number | undefined
) {
  if (key === "biometric") return current
  if (key === "delete") return current.slice(0, -1)
  const [integer = "", fraction] = current.split(".")
  if (key === "decimal") {
    if (fractionDigits === 0 || fraction !== undefined) return current
    return `${integer || "0"}.`
  }
  if (fraction !== undefined && fraction.length >= fractionDigits) {
    return current
  }
  if (integer.length + (fraction?.length ?? 0) >= MAX_DIGITS) return current
  const next =
    fraction === undefined && integer === "0" ? key : `${current}${key}`
  if (max !== undefined && toAmount(next) > max) return current
  return next
}

function formatParts(
  value: string,
  locale: string | undefined,
  currency: string | undefined,
  decimalSeparator: string
) {
  const fraction = value.split(".")[1]
  const fractionDigits = fraction?.length ?? 0
  const parts = toParts(
    createFormatter(locale, currency, fractionDigits),
    toAmount(value)
  )
  if (fraction === undefined || fractionDigits > 0) return parts
  let last = -1
  parts.forEach((part, index) => {
    if (part.type === "integer" || part.type === "group") last = index
  })
  const decimal = { type: "decimal", value: decimalSeparator }
  if (last === -1) return [...parts, decimal]
  return [...parts.slice(0, last + 1), decimal, ...parts.slice(last + 1)]
}

function amountSizeClassName(characters: number) {
  if (characters > 11) return { amount: "text-4xl", symbol: "text-2xl" }
  if (characters > 8) return { amount: "text-5xl", symbol: "text-3xl" }
  return { amount: "text-6xl", symbol: "text-4xl" }
}

function AmountInput({
  value: valueProp,
  defaultValue = "",
  onValueChange,
  currency,
  locale,
  maxFractionDigits: maxFractionDigitsProp,
  max,
  placeholder = "0",
  disabled = false,
  deleteLabel,
  decimalLabel,
  className,
  amountClassName,
  keypadClassName,
  accessibilityLabel,
  ...props
}: React.ComponentProps<typeof View> & {
  value?: string
  defaultValue?: string
  onValueChange?: (value: string, amount: number) => void
  currency?: string
  locale?: string
  maxFractionDigits?: number
  max?: number
  placeholder?: string
  disabled?: boolean
  deleteLabel?: string
  decimalLabel?: string
  amountClassName?: string
  keypadClassName?: string
}) {
  const haptics = useHaptics()
  const maxFractionDigits = Math.max(
    0,
    maxFractionDigitsProp ?? currencyFractionDigits(locale, currency)
  )
  const decimalSeparator = React.useMemo(
    () => decimalSeparatorOf(locale),
    [locale]
  )
  const [uncontrolled, setUncontrolled] = React.useState(() =>
    sanitize(defaultValue, maxFractionDigits)
  )
  const isControlled = valueProp !== undefined
  const value = isControlled ? valueProp : uncontrolled
  const valueRef = React.useRef(value)
  valueRef.current = value

  const offset = useSharedValue(0)

  const reject = () => {
    haptics.notification("error")
    const step = { duration: SHAKE_STEP, reduceMotion: ReduceMotion.System }
    offset.value = withSequence(
      withTiming(-12, step),
      withTiming(10, step),
      withTiming(-8, step),
      withTiming(6, step),
      withTiming(-3, step),
      withTiming(0, step)
    )
  }

  const shakeStyle = useAnimatedStyle(() => ({
    transform: [{ translateX: offset.value }],
  }))

  const press = (key: KeypadKeyValue) => {
    const current = valueRef.current
    const next = nextValue(current, key, maxFractionDigits, max)
    if (next === current) {
      if (key !== "delete" && key !== "biometric" && current !== "0") {
        reject()
      }
      return
    }
    valueRef.current = next
    if (!isControlled) setUncontrolled(next)
    onValueChange?.(next, toAmount(next))
    haptics.selection()
  }

  const empty = value === ""
  const parts = empty
    ? formatParts("0", locale, currency, decimalSeparator).map((part) =>
        part.type === "integer" ? { ...part, value: placeholder } : part
      )
    : formatParts(value, locale, currency, decimalSeparator)
  const text = parts.map((part) => part.value).join("")
  const size = amountSizeClassName(text.length)
  const color = empty || disabled ? "text-label-tertiary" : "text-label"

  return (
    <View className={cn("items-center gap-8", className)} {...props}>
      <AnimatedView
        className="h-[4.5rem] w-full items-center justify-center px-4"
        style={shakeStyle}
      >
        <Text
          numberOfLines={1}
          adjustsFontSizeToFit
          minimumFontScale={0.5}
          accessibilityLabel={
            accessibilityLabel ? `${accessibilityLabel}, ${text}` : text
          }
          accessibilityLiveRegion="polite"
          className={cn(
            "font-semibold tabular-nums tracking-tight",
            size.amount,
            color,
            amountClassName
          )}
        >
          {parts.map((part) =>
            part.type === "currency" ? (
              <Text
                key="currency"
                className={cn("font-semibold", size.symbol, color)}
              >
                {part.value}
              </Text>
            ) : (
              part.value
            )
          )}
        </Text>
      </AnimatedView>
      <Keypad
        accessoryKey={maxFractionDigits > 0 ? "decimal" : undefined}
        decimalSeparator={decimalSeparator}
        decimalLabel={decimalLabel}
        deleteLabel={deleteLabel}
        disabled={disabled}
        deleteDisabled={empty}
        onKeyPress={press}
        className={keypadClassName}
      />
    </View>
  )
}

export { AmountInput }
```

4. Update the import paths to match your project.

**StyleSheet**

1. Install the dependencies:

```bash title="Terminal"
npx expo install react-native-reanimated react-native-worklets
```

2. Add the pieces it builds on: [Keypad](/docs/components/keypad), [Text](/docs/components/text), and the primitives `components/primitives/haptics.tsx`.

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

```tsx title="stylesheet/components/ui/amount-input.tsx"
import * as React from "react"
import {
  type StyleProp,
  StyleSheet,
  type TextStyle,
  View,
  type ViewStyle,
} from "react-native"
import {
  ReduceMotion,
  useAnimatedStyle,
  useSharedValue,
  withSequence,
  withTiming,
} from "react-native-reanimated"
import { useHaptics } from "@/components/primitives/haptics"
import { AnimatedView } from "@/components/ui/animated-view"
import { Keypad, type KeypadKeyValue } from "@/components/ui/keypad"
import { Text } from "@/components/ui/text"
import { fontSize, useTheme } from "@/components/ui/theme"

type AmountPart = { type: string; value: string }

const MAX_DIGITS = 15

const SHAKE_STEP = 400 / 6

function createFormatter(
  locale: string | undefined,
  currency: string | undefined,
  fractionDigits: number
) {
  const digits = {
    minimumFractionDigits: fractionDigits,
    maximumFractionDigits: fractionDigits,
  }
  try {
    return new Intl.NumberFormat(
      locale,
      currency ? { ...digits, style: "currency", currency } : digits
    )
  } catch {
    return new Intl.NumberFormat(undefined, digits)
  }
}

function toParts(formatter: Intl.NumberFormat, amount: number): AmountPart[] {
  if (typeof formatter.formatToParts === "function") {
    return formatter.formatToParts(amount)
  }
  const text = formatter.format(amount)
  const match = text.match(/^(\D*?)(\d[\d\s.,'\u2019\u00a0\u202f]*\d|\d)(\D*)$/)
  if (!match) return [{ type: "integer", value: text }]
  const [, prefix = "", number = "", suffix = ""] = match
  const parts: AmountPart[] = []
  if (prefix.trim()) parts.push({ type: "currency", value: prefix.trim() })
  if (prefix !== prefix.trimEnd()) parts.push({ type: "literal", value: " " })
  parts.push({ type: "integer", value: number })
  if (suffix !== suffix.trimStart()) parts.push({ type: "literal", value: " " })
  if (suffix.trim()) parts.push({ type: "currency", value: suffix.trim() })
  return parts
}

function currencyFractionDigits(
  locale: string | undefined,
  currency: string | undefined
) {
  if (!currency) return 2
  try {
    return (
      new Intl.NumberFormat(locale, {
        style: "currency",
        currency,
      }).resolvedOptions().maximumFractionDigits ?? 2
    )
  } catch {
    return 2
  }
}

function decimalSeparatorOf(locale: string | undefined) {
  const formatter = createFormatter(locale, undefined, 1)
  const parts = toParts(formatter, 1.5)
  const decimal = parts.find((part) => part.type === "decimal")?.value
  if (decimal) return decimal
  return formatter.format(1.5).match(/1(\D+)5/)?.[1] ?? "."
}

function toAmount(value: string) {
  if (!value || value === ".") return 0
  const amount = Number(value)
  return Number.isFinite(amount) ? amount : 0
}

function sanitize(value: string, fractionDigits: number) {
  const [integer = "", ...rest] = value.replace(/[^\d.]/g, "").split(".")
  const fraction = rest.join("").slice(0, fractionDigits)
  const trimmed = integer.replace(/^0+(?=\d)/, "")
  if (fractionDigits === 0 || rest.length === 0) return trimmed
  return `${trimmed || "0"}.${fraction}`
}

function nextValue(
  current: string,
  key: KeypadKeyValue,
  fractionDigits: number,
  max: number | undefined
) {
  if (key === "biometric") return current
  if (key === "delete") return current.slice(0, -1)
  const [integer = "", fraction] = current.split(".")
  if (key === "decimal") {
    if (fractionDigits === 0 || fraction !== undefined) return current
    return `${integer || "0"}.`
  }
  if (fraction !== undefined && fraction.length >= fractionDigits) {
    return current
  }
  if (integer.length + (fraction?.length ?? 0) >= MAX_DIGITS) return current
  const next =
    fraction === undefined && integer === "0" ? key : `${current}${key}`
  if (max !== undefined && toAmount(next) > max) return current
  return next
}

function formatParts(
  value: string,
  locale: string | undefined,
  currency: string | undefined,
  decimalSeparator: string
) {
  const fraction = value.split(".")[1]
  const fractionDigits = fraction?.length ?? 0
  const parts = toParts(
    createFormatter(locale, currency, fractionDigits),
    toAmount(value)
  )
  if (fraction === undefined || fractionDigits > 0) return parts
  let last = -1
  parts.forEach((part, index) => {
    if (part.type === "integer" || part.type === "group") last = index
  })
  const decimal = { type: "decimal", value: decimalSeparator }
  if (last === -1) return [...parts, decimal]
  return [...parts.slice(0, last + 1), decimal, ...parts.slice(last + 1)]
}

const styles = StyleSheet.create({
  root: { alignItems: "center", gap: 32 },
  display: {
    height: 72,
    width: "100%",
    alignItems: "center",
    justifyContent: "center",
    paddingHorizontal: 16,
  },
  amount: { fontWeight: "600", fontVariant: ["tabular-nums"] },
  amountLarge: { fontSize: 60, lineHeight: 60, letterSpacing: -1.5 },
  amountMedium: { fontSize: 48, lineHeight: 48, letterSpacing: -1.2 },
  amountSmall: { fontSize: 36, lineHeight: 40, letterSpacing: -0.9 },
  symbol: { fontWeight: "600" },
  symbolLarge: { fontSize: 36, lineHeight: 40 },
  symbolMedium: { ...fontSize["3xl"] },
  symbolSmall: { ...fontSize["2xl"] },
})

function amountSizeStyle(characters: number) {
  if (characters > 11) {
    return { amount: styles.amountSmall, symbol: styles.symbolSmall }
  }
  if (characters > 8) {
    return { amount: styles.amountMedium, symbol: styles.symbolMedium }
  }
  return { amount: styles.amountLarge, symbol: styles.symbolLarge }
}

function AmountInput({
  value: valueProp,
  defaultValue = "",
  onValueChange,
  currency,
  locale,
  maxFractionDigits: maxFractionDigitsProp,
  max,
  placeholder = "0",
  disabled = false,
  deleteLabel,
  decimalLabel,
  style,
  amountStyle,
  keypadStyle,
  accessibilityLabel,
  ...props
}: React.ComponentProps<typeof View> & {
  value?: string
  defaultValue?: string
  onValueChange?: (value: string, amount: number) => void
  currency?: string
  locale?: string
  maxFractionDigits?: number
  max?: number
  placeholder?: string
  disabled?: boolean
  deleteLabel?: string
  decimalLabel?: string
  amountStyle?: StyleProp<TextStyle>
  keypadStyle?: StyleProp<ViewStyle>
}) {
  const { colors } = useTheme()
  const haptics = useHaptics()
  const maxFractionDigits = Math.max(
    0,
    maxFractionDigitsProp ?? currencyFractionDigits(locale, currency)
  )
  const decimalSeparator = React.useMemo(
    () => decimalSeparatorOf(locale),
    [locale]
  )
  const [uncontrolled, setUncontrolled] = React.useState(() =>
    sanitize(defaultValue, maxFractionDigits)
  )
  const isControlled = valueProp !== undefined
  const value = isControlled ? valueProp : uncontrolled
  const valueRef = React.useRef(value)
  valueRef.current = value

  const offset = useSharedValue(0)

  const reject = () => {
    haptics.notification("error")
    const step = { duration: SHAKE_STEP, reduceMotion: ReduceMotion.System }
    offset.value = withSequence(
      withTiming(-12, step),
      withTiming(10, step),
      withTiming(-8, step),
      withTiming(6, step),
      withTiming(-3, step),
      withTiming(0, step)
    )
  }

  const shakeStyle = useAnimatedStyle(() => ({
    transform: [{ translateX: offset.value }],
  }))

  const press = (key: KeypadKeyValue) => {
    const current = valueRef.current
    const next = nextValue(current, key, maxFractionDigits, max)
    if (next === current) {
      if (key !== "delete" && key !== "biometric" && current !== "0") {
        reject()
      }
      return
    }
    valueRef.current = next
    if (!isControlled) setUncontrolled(next)
    onValueChange?.(next, toAmount(next))
    haptics.selection()
  }

  const empty = value === ""
  const parts = empty
    ? formatParts("0", locale, currency, decimalSeparator).map((part) =>
        part.type === "integer" ? { ...part, value: placeholder } : part
      )
    : formatParts(value, locale, currency, decimalSeparator)
  const text = parts.map((part) => part.value).join("")
  const size = amountSizeStyle(text.length)
  const color = empty || disabled ? colors.labelTertiary : colors.label

  return (
    <View style={[styles.root, style]} {...props}>
      <AnimatedView style={[styles.display, shakeStyle]}>
        <Text
          numberOfLines={1}
          adjustsFontSizeToFit
          minimumFontScale={0.5}
          accessibilityLabel={
            accessibilityLabel ? `${accessibilityLabel}, ${text}` : text
          }
          accessibilityLiveRegion="polite"
          style={[styles.amount, size.amount, { color }, amountStyle]}
        >
          {parts.map((part) =>
            part.type === "currency" ? (
              <Text
                key="currency"
                style={[styles.symbol, size.symbol, { color }]}
              >
                {part.value}
              </Text>
            ) : (
              part.value
            )
          )}
        </Text>
      </AnimatedView>
      <Keypad
        accessoryKey={maxFractionDigits > 0 ? "decimal" : undefined}
        decimalSeparator={decimalSeparator}
        decimalLabel={decimalLabel}
        deleteLabel={deleteLabel}
        disabled={disabled}
        deleteDisabled={empty}
        onKeyPress={press}
        style={keypadStyle}
      />
    </View>
  )
}

export { AmountInput }
```

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/AmountInput.swift"
import SwiftUI

struct AmountFormat {
  let locale: Locale
  let currency: String?
  let fractionDigits: Int
  let decimalSeparator: String
  let prefix: String
  let suffix: String

  init(locale: Locale, currency: String?, maxFractionDigits: Int? = nil) {
    let formatter = NumberFormatter()
    formatter.locale = locale
    formatter.numberStyle = currency == nil ? .decimal : .currency
    if let currency { formatter.currencyCode = currency }
    self.locale = locale
    self.currency = currency
    fractionDigits = max(0, maxFractionDigits ?? (currency == nil ? 2 : formatter.maximumFractionDigits))
    decimalSeparator = formatter.decimalSeparator ?? "."
    prefix = currency == nil ? "" : formatter.positivePrefix ?? ""
    suffix = currency == nil ? "" : formatter.positiveSuffix ?? ""
  }

  func number(_ value: String) -> String {
    let parts = value.split(separator: ".", maxSplits: 1, omittingEmptySubsequences: false)
    let integer = parts.first.map(String.init) ?? ""
    let fraction = parts.count > 1 ? String(parts[1]) : ""
    let formatter = NumberFormatter()
    formatter.locale = locale
    formatter.numberStyle = .decimal
    formatter.usesGroupingSeparator = true
    formatter.minimumFractionDigits = fraction.count
    formatter.maximumFractionDigits = fraction.count
    let source = (integer.isEmpty ? "0" : integer) + (fraction.isEmpty ? "" : "." + fraction)
    let decimal = NSDecimalNumber(string: source, locale: Locale(identifier: "en_US_POSIX"))
    var text = formatter.string(from: decimal == .notANumber ? 0 : decimal) ?? source
    if parts.count > 1 && fraction.isEmpty {
      text += formatter.decimalSeparator ?? "."
    }
    return text
  }

  func spoken(_ value: String) -> String {
    prefix + number(value.isEmpty ? "0" : value) + suffix
  }
}

enum AmountMath {
  static let maxIntegerDigits = 15

  static func amount(_ value: String) -> Double {
    Double(value) ?? 0
  }

  static func rejects(_ key: KeypadKey, value: String) -> Bool {
    switch key {
    case .digit(0): value != "0"
    case .digit, .decimal: true
    case .delete, .biometric: false
    }
  }

  static func press(_ key: KeypadKey, value: String, fractionDigits: Int, max: Double?) -> String? {
    let next: String
    switch key {
    case .digit(let digit):
      if let dot = value.firstIndex(of: ".") {
        guard value[value.index(after: dot)...].count < fractionDigits else { return nil }
        next = value + String(digit)
      } else if value == "0" {
        guard digit != 0 else { return nil }
        next = String(digit)
      } else {
        guard value.count < maxIntegerDigits else { return nil }
        next = value + String(digit)
      }
    case .decimal:
      guard fractionDigits > 0, !value.contains(".") else { return nil }
      next = (value.isEmpty ? "0" : value) + "."
    case .delete:
      guard !value.isEmpty else { return nil }
      next = String(value.dropLast())
    case .biometric:
      return nil
    }
    if let max, amount(next) > max { return nil }
    return next
  }
}

struct AmountDisplay: View {
  let value: String
  let format: AmountFormat
  let placeholder: String
  let label: LocalizedStringKey

  @Environment(\.isEnabled) private var isEnabled
  @ScaledMetric(relativeTo: .largeTitle) private var scale: CGFloat = 1

  var body: some View {
    let empty = value.isEmpty
    Text(text(empty: empty))
      .monospacedDigit()
      .lineLimit(1)
      .minimumScaleFactor(0.3)
      .frame(maxWidth: .infinity)
      .accessibilityElement(children: .ignore)
      .accessibilityLabel(Text(label))
      .accessibilityValue(Text(verbatim: format.spoken(value)))
  }

  private func text(empty: Bool) -> AttributedString {
    let symbolFont = Font.system(size: TextStyle.xl3.size * scale, weight: .semibold)
    let numberFont = Font.system(size: 60 * scale, weight: .semibold)
    let symbolColor: Color = isEnabled ? .labelSecondary : .labelQuaternary
    let numberColor: Color = !isEnabled ? .labelQuaternary : empty ? .labelTertiary : .label
    var prefix = AttributedString(format.prefix)
    prefix.font = symbolFont
    prefix.foregroundColor = symbolColor
    var number = AttributedString(empty ? placeholder : format.number(value))
    number.font = numberFont
    number.foregroundColor = numberColor
    var suffix = AttributedString(format.suffix)
    suffix.font = symbolFont
    suffix.foregroundColor = symbolColor
    return prefix + number + suffix
  }
}

public struct AmountInput: View {
  @Binding var value: String
  let currency: String?
  let maxFractionDigits: Int?
  let max: Double?
  let placeholder: String
  let label: LocalizedStringKey
  let deleteLabel: LocalizedStringKey
  let decimalLabel: LocalizedStringKey
  let onValueChange: ((String, Double) -> Void)?

  @Environment(\.locale) private var locale
  @Environment(\.isEnabled) private var isEnabled
  @State private var rejections = 0

  public init(
    value: Binding<String>,
    currency: String? = nil,
    maxFractionDigits: Int? = nil,
    max: Double? = nil,
    placeholder: String = "0",
    label: LocalizedStringKey = "Amount",
    deleteLabel: LocalizedStringKey = "Delete",
    decimalLabel: LocalizedStringKey = "Decimal separator",
    onValueChange: ((String, Double) -> Void)? = nil
  ) {
    _value = value
    self.currency = currency
    self.maxFractionDigits = maxFractionDigits
    self.max = max
    self.placeholder = placeholder
    self.label = label
    self.deleteLabel = deleteLabel
    self.decimalLabel = decimalLabel
    self.onValueChange = onValueChange
  }

  public var body: some View {
    let format = AmountFormat(locale: locale, currency: currency, maxFractionDigits: maxFractionDigits)
    VStack(spacing: 32) {
      AmountDisplay(value: value, format: format, placeholder: placeholder, label: label)
        .shake(trigger: rejections)
      Keypad(
        accessory: format.fractionDigits > 0 ? .decimal(format.decimalSeparator, label: decimalLabel) : .none,
        deleteLabel: deleteLabel,
        canDelete: !value.isEmpty
      ) { key in
        guard isEnabled else { return false }
        guard let next = AmountMath.press(key, value: value, fractionDigits: format.fractionDigits, max: max) else {
          if AmountMath.rejects(key, value: value) { rejections += 1 }
          return false
        }
        value = next
        onValueChange?(next, AmountMath.amount(next))
        return true
      }
    }
    .hapticFeedback(.error, trigger: rejections)
  }
}
```

```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/Keypad.swift"
import PhosphorSwift
import SwiftUI

public enum KeypadKey: Hashable, Sendable {
  case digit(Int)
  case decimal
  case delete
  case biometric
}

public enum KeypadAccessory {
  case none
  case decimal(String, label: LocalizedStringKey = "Decimal separator")
  case biometric(Image, label: LocalizedStringKey = "Use biometrics")
}

public struct Keypad: View {
  let accessory: KeypadAccessory
  let deleteLabel: LocalizedStringKey
  let canDelete: Bool
  let press: (KeypadKey) -> Bool

  public init(
    accessory: KeypadAccessory = .none,
    deleteLabel: LocalizedStringKey = "Delete",
    deleteDisabled: Bool = false,
    onKeyPress: @escaping (KeypadKey) -> Void
  ) {
    self.accessory = accessory
    self.deleteLabel = deleteLabel
    canDelete = !deleteDisabled
    press = { key in
      onKeyPress(key)
      return true
    }
  }

  init(
    accessory: KeypadAccessory,
    deleteLabel: LocalizedStringKey,
    canDelete: Bool,
    press: @escaping (KeypadKey) -> Bool
  ) {
    self.accessory = accessory
    self.deleteLabel = deleteLabel
    self.canDelete = canDelete
    self.press = press
  }

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

  public var body: some View {
    let size = min(max(72 * scale, 64), 80)
    VStack(spacing: 16) {
      ForEach(0..<3) { row in
        HStack(spacing: 24) {
          ForEach(1..<4) { column in
            digit(row * 3 + column, size: size)
          }
        }
      }
      HStack(spacing: 24) {
        accessoryKey(size: size)
        digit(0, size: size)
        key(.delete, size: size, filled: false) {
          Ph.backspace.regular
            .resizable()
            .frame(width: 28, height: 28)
        }
        .disabled(!canDelete)
        .accessibilityLabel(Text(deleteLabel))
      }
    }
    .accessibilityElement(children: .contain)
  }

  private func digit(_ value: Int, size: CGFloat) -> some View {
    key(.digit(value), size: size, filled: true) {
      Text(verbatim: "\(value)")
        .scaledFont(.xl2)
        .monospacedDigit()
    }
    .accessibilityLabel(Text(verbatim: "\(value)"))
  }

  @ViewBuilder
  private func accessoryKey(size: CGFloat) -> some View {
    switch accessory {
    case .none:
      Color.clear.frame(width: size, height: size)
        .accessibilityHidden(true)
    case .decimal(let separator, let label):
      key(.decimal, size: size, filled: false) {
        Text(verbatim: separator)
          .scaledFont(.xl2)
      }
      .accessibilityLabel(Text(label))
    case .biometric(let icon, let label):
      key(.biometric, size: size, filled: false) {
        icon
          .resizable()
          .frame(width: 28, height: 28)
      }
      .accessibilityLabel(Text(label))
    }
  }

  private func key<Label: View>(
    _ key: KeypadKey,
    size: CGFloat,
    filled: Bool,
    @ViewBuilder label: @escaping () -> Label
  ) -> some View {
    HapticButton(style: PressReader { pressed in
      KeypadFace(pressed: pressed, filled: filled, size: size, label: label)
    }) {
      press(key)
    }
  }
}

private struct KeypadFace<Label: View>: View {
  let pressed: Bool
  let filled: Bool
  let size: CGFloat
  let label: () -> Label

  @Environment(\.isEnabled) private var isEnabled

  var body: some View {
    label()
      .foregroundStyle(isEnabled ? Color.label : .labelQuaternary)
      .frame(width: size, height: size)
      .background(fill, in: Circle())
      .contentShape(Circle())
      .animation(.easeOut(duration: 0.12), value: pressed)
  }

  private var fill: Color {
    if pressed { return .controlPressed }
    if !filled { return .clear }
    return isEnabled ? .control : .controlDisabled
  }
}

private struct ShakeModifier: ViewModifier {
  let trigger: Int

  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  func body(content: Content) -> some View {
    let still = reduceMotion
    content.keyframeAnimator(initialValue: CGFloat(0), trigger: trigger) { view, offset in
      view.offset(x: still ? 0 : offset)
    } keyframes: { _ in
      KeyframeTrack {
        LinearKeyframe(-8, duration: 0.08)
        LinearKeyframe(7, duration: 0.08)
        LinearKeyframe(-5, duration: 0.08)
        LinearKeyframe(3, duration: 0.08)
        LinearKeyframe(0, duration: 0.08, timingCurve: .easeOut)
      }
    }
  }
}

extension View {
  func shake(trigger: Int) -> some View {
    modifier(ShakeModifier(trigger: trigger))
  }
}
```

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

import androidx.compose.animation.core.Animatable
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.BoxWithConstraints
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.hapticfeedback.HapticFeedbackType
import androidx.compose.ui.semantics.LiveRegionMode
import androidx.compose.ui.semantics.clearAndSetSemantics
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.liveRegion
import androidx.compose.ui.text.AnnotatedString
import androidx.compose.ui.text.SpanStyle
import androidx.compose.ui.text.buildAnnotatedString
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.rememberTextMeasurer
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.text.withStyle
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.em
import androidx.compose.ui.unit.sp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography
import java.text.DecimalFormat
import java.text.DecimalFormatSymbols
import java.text.NumberFormat
import java.util.Currency
import java.util.Locale
import kotlinx.coroutines.launch

private const val AmountMaxIntegerDigits = 15

private const val AmountFontSize = 60f

private const val AmountMinFontSize = 28f

private class AmountFormat(
    val prefix: String,
    val suffix: String,
    val decimal: Char,
    val fractionDigits: Int,
    val integer: NumberFormat,
)

private fun amountFormat(currency: String?, locale: Locale, maxFractionDigits: Int?): AmountFormat {
    val integer = NumberFormat.getIntegerInstance(locale).apply { isGroupingUsed = true }
    if (currency == null) {
        return AmountFormat(
            prefix = "",
            suffix = "",
            decimal = DecimalFormatSymbols.getInstance(locale).decimalSeparator,
            fractionDigits = (maxFractionDigits ?: 2).coerceAtLeast(0),
            integer = integer,
        )
    }
    val code = Currency.getInstance(currency)
    val format = NumberFormat.getCurrencyInstance(locale).apply { this.currency = code }
    val decimal = format as? DecimalFormat
    return AmountFormat(
        prefix = decimal?.positivePrefix ?: code.getSymbol(locale),
        suffix = decimal?.positiveSuffix ?: "",
        decimal = decimal?.decimalFormatSymbols?.monetaryDecimalSeparator
            ?: DecimalFormatSymbols.getInstance(locale).decimalSeparator,
        fractionDigits = (maxFractionDigits ?: code.defaultFractionDigits).coerceAtLeast(0),
        integer = integer,
    )
}

private fun AmountFormat.number(value: String): String {
    val whole = value.substringBefore('.')
    val grouped = whole.toLongOrNull()?.let { integer.format(it) } ?: whole
    return if (value.contains('.')) grouped + decimal + value.substringAfter('.') else grouped
}

private fun amountOf(value: String): Double = value.trimEnd('.').toDoubleOrNull() ?: 0.0

@Composable
fun AmountInput(
    modifier: Modifier = Modifier,
    value: String? = null,
    onValueChange: ((value: String, amount: Double) -> Unit)? = null,
    defaultValue: String = "",
    currency: String? = null,
    locale: Locale = Locale.getDefault(),
    maxFractionDigits: Int? = null,
    max: Double? = null,
    placeholder: String = "0",
    enabled: Boolean = true,
    decimalLabel: String = "Decimal separator",
    deleteLabel: String = "Delete",
) {
    val colors = EsuissTheme.colors
    val format = remember(currency, locale, maxFractionDigits) { amountFormat(currency, locale, maxFractionDigits) }
    var internal by remember { mutableStateOf(defaultValue) }
    val current = value ?: internal
    val haptics = rememberHaptics()
    val reduced = formReducedMotion()
    val offset = remember { Animatable(0f) }
    val scope = rememberCoroutineScope()
    val reject = {
        haptics.perform(HapticFeedbackType.Reject)
        if (!reduced) scope.launch { offset.shake() }
    }
    val update: (String) -> Unit = { next ->
        if (next != current) {
            if (max != null && amountOf(next) > max) {
                reject()
            } else {
                if (value == null) internal = next
                onValueChange?.invoke(next, amountOf(next))
            }
        }
    }
    val empty = current.isEmpty()
    val number = if (empty) placeholder else format.number(current)
    val foreground = when {
        !enabled -> colors.labelQuaternary
        empty -> colors.labelTertiary
        else -> colors.label
    }
    val symbol = if (enabled && !empty) colors.labelSecondary else foreground
    val text: AnnotatedString = buildAnnotatedString {
        if (format.prefix.isNotEmpty()) withStyle(SpanStyle(fontSize = 0.5.em, color = symbol)) { append(format.prefix) }
        append(number)
        if (format.suffix.isNotEmpty()) withStyle(SpanStyle(fontSize = 0.5.em, color = symbol)) { append(format.suffix) }
    }
    val base = Typography.xl3.copy(
        color = foreground,
        fontSize = AmountFontSize.sp,
        lineHeight = 1.1.em,
        letterSpacing = 0.em,
        fontWeight = FontWeight.SemiBold,
        fontFeatureSettings = "tnum",
        textAlign = TextAlign.Center,
    )
    val measurer = rememberTextMeasurer()
    Column(
        modifier = modifier,
        verticalArrangement = Arrangement.spacedBy(32.dp),
        horizontalAlignment = Alignment.CenterHorizontally,
    ) {
        BoxWithConstraints(
            modifier = Modifier
                .fillMaxWidth()
                .height(72.dp)
                .graphicsLayer { translationX = offset.value.dp.toPx() }
                .clearAndSetSemantics {
                    contentDescription = text.text
                    liveRegion = LiveRegionMode.Polite
                },
            contentAlignment = Alignment.Center,
        ) {
            val available = constraints.maxWidth
            val width = remember(text, base, available) {
                measurer.measure(text, base.copy(textAlign = TextAlign.Start), maxLines = 1, softWrap = false).size.width
            }
            val fontSize = if (width > available && width > 0) {
                (AmountFontSize * available / width).coerceAtLeast(AmountMinFontSize)
            } else {
                AmountFontSize
            }
            BasicText(text, style = base.copy(fontSize = fontSize.sp), maxLines = 1, softWrap = false)
        }
        Keypad(
            onKeyPress = { key ->
                when (key) {
                    is KeypadKey.Digit -> {
                        val digit = key.value.toString()
                        val fraction = current.substringAfter('.', "")
                        val whole = current.substringBefore('.')
                        when {
                            current.contains('.') -> if (fraction.length < format.fractionDigits) update(current + digit) else reject()
                            whole == "0" -> update(digit)
                            whole.length >= AmountMaxIntegerDigits -> reject()
                            else -> update(current + digit)
                        }
                    }
                    KeypadKey.Decimal -> when {
                        format.fractionDigits == 0 || current.contains('.') -> reject()
                        current.isEmpty() -> update("0.")
                        else -> update("$current.")
                    }
                    KeypadKey.Delete -> if (current.isNotEmpty()) update(current.dropLast(1))
                    KeypadKey.Biometric -> Unit
                }
            },
            accessory = if (format.fractionDigits > 0) KeypadAccessory.Decimal(format.decimal.toString(), decimalLabel) else KeypadAccessory.None,
            deleteLabel = deleteLabel,
            enabled = enabled,
        )
    }
}
```

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

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

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

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

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

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

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

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

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

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

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

import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.remember
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.hapticfeedback.HapticFeedback
import androidx.compose.ui.hapticfeedback.HapticFeedbackType
import androidx.compose.ui.platform.LocalHapticFeedback

val LocalHapticsEnabled = staticCompositionLocalOf { true }

@Composable
fun ProvideHaptics(enabled: Boolean, content: @Composable () -> Unit) {
    CompositionLocalProvider(LocalHapticsEnabled provides enabled, content = content)
}

internal class Haptics(private val feedback: HapticFeedback, private val enabled: Boolean) {
    fun perform(type: HapticFeedbackType) {
        if (enabled) feedback.performHapticFeedback(type)
    }

    fun toggle(on: Boolean) = perform(if (on) HapticFeedbackType.ToggleOn else HapticFeedbackType.ToggleOff)

    fun selection() = perform(HapticFeedbackType.SegmentTick)
}

@Composable
internal fun rememberHaptics(): Haptics {
    val feedback = LocalHapticFeedback.current
    val enabled = LocalHapticsEnabled.current
    return remember(feedback, enabled) { Haptics(feedback, enabled) }
}
```

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

import androidx.compose.animation.core.Animatable
import androidx.compose.animation.core.AnimationVector1D
import androidx.compose.animation.core.keyframes
import androidx.compose.foundation.background
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.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.shape.CircleShape
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.graphics.vector.ImageVector
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.Backspace
import com.adamglin.phosphoricons.regular.Fingerprint
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography

private val KeypadKeySize = 72.dp

private val KeypadColumnGap = 24.dp

private val KeypadRowGap = 16.dp

private val KeypadRows = listOf(listOf(1, 2, 3), listOf(4, 5, 6), listOf(7, 8, 9))

sealed interface KeypadKey {
    data class Digit(val value: Int) : KeypadKey

    data object Decimal : KeypadKey

    data object Biometric : KeypadKey

    data object Delete : KeypadKey
}

sealed interface KeypadAccessory {
    data object None : KeypadAccessory

    data class Decimal(
        val separator: String = ".",
        val label: String = "Decimal separator",
    ) : KeypadAccessory

    data class Biometric(
        val icon: ImageVector = PhosphorIcons.Regular.Fingerprint,
        val label: String = "Use biometrics",
    ) : KeypadAccessory
}

@Composable
fun Keypad(
    onKeyPress: (KeypadKey) -> Unit,
    modifier: Modifier = Modifier,
    accessory: KeypadAccessory = KeypadAccessory.None,
    deleteLabel: String = "Delete",
    enabled: Boolean = true,
) {
    Column(
        modifier = modifier,
        verticalArrangement = Arrangement.spacedBy(KeypadRowGap),
        horizontalAlignment = Alignment.CenterHorizontally,
    ) {
        KeypadRows.forEach { row ->
            Row(horizontalArrangement = Arrangement.spacedBy(KeypadColumnGap)) {
                row.forEach { digit -> KeypadDigit(digit, enabled, onKeyPress) }
            }
        }
        Row(horizontalArrangement = Arrangement.spacedBy(KeypadColumnGap)) {
            when (accessory) {
                KeypadAccessory.None -> Box(Modifier.size(KeypadKeySize))
                is KeypadAccessory.Decimal -> KeypadButton(
                    onClick = { onKeyPress(KeypadKey.Decimal) },
                    enabled = enabled,
                    filled = true,
                    contentDescription = accessory.label,
                ) {
                    KeypadText(accessory.separator)
                }
                is KeypadAccessory.Biometric -> KeypadButton(
                    onClick = { onKeyPress(KeypadKey.Biometric) },
                    enabled = enabled,
                    filled = false,
                    contentDescription = accessory.label,
                ) {
                    Icon(accessory.icon, contentDescription = null, size = 32.dp)
                }
            }
            KeypadDigit(0, enabled, onKeyPress)
            KeypadButton(
                onClick = { onKeyPress(KeypadKey.Delete) },
                enabled = enabled,
                filled = false,
                contentDescription = deleteLabel,
            ) {
                Icon(PhosphorIcons.Regular.Backspace, contentDescription = null, size = 28.dp)
            }
        }
    }
}

@Composable
private fun KeypadDigit(digit: Int, enabled: Boolean, onKeyPress: (KeypadKey) -> Unit) {
    KeypadButton(onClick = { onKeyPress(KeypadKey.Digit(digit)) }, enabled = enabled, filled = true) {
        KeypadText(digit.toString())
    }
}

@Composable
private fun KeypadText(text: String) {
    BasicText(
        text,
        style = Typography.xl2.copy(
            color = LocalContentColor.current,
            fontWeight = FontWeight.Medium,
            fontFeatureSettings = "tnum",
        ),
    )
}

@Composable
private fun KeypadButton(
    onClick: () -> Unit,
    enabled: Boolean,
    filled: Boolean,
    contentDescription: String? = null,
    content: @Composable () -> Unit,
) {
    val colors = EsuissTheme.colors
    val interaction = remember { MutableInteractionSource() }
    val pressed by interaction.collectIsPressedAsState()
    val haptics = rememberHaptics()
    val background = when {
        !enabled -> if (filled) colors.controlDisabled else Color.Transparent
        pressed -> colors.controlPressed
        filled -> colors.control
        else -> Color.Transparent
    }
    val foreground = if (enabled) colors.label else colors.labelQuaternary
    Box(
        modifier = Modifier
            .size(KeypadKeySize)
            .clip(CircleShape)
            .background(background, CircleShape)
            .clickable(
                interactionSource = interaction,
                indication = null,
                enabled = enabled,
                role = Role.Button,
            ) {
                haptics.selection()
                onClick()
            }
            .then(
                if (contentDescription != null) {
                    Modifier.semantics { this.contentDescription = contentDescription }
                } else {
                    Modifier
                },
            ),
        contentAlignment = Alignment.Center,
    ) {
        CompositionLocalProvider(LocalContentColor provides foreground) {
            content()
        }
    }
}

internal suspend fun Animatable<Float, AnimationVector1D>.shake() {
    snapTo(0f)
    animateTo(
        0f,
        keyframes {
            durationMillis = 400
            -8f at 60
            7f at 140
            -5f at 220
            3f at 300
            0f at 400
        },
    )
}
```

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

## Usage

```tsx
import { AmountInput } from "@/components/ui/amount-input"
```

```tsx
<AmountInput currency="USD" locale="en-US" />
```

The value is a plain numeric string such as `"1250.5"`. Use `defaultValue` for uncontrolled state, or `value` with `onValueChange`, which receives the string and the parsed number.

Fraction digits default to the currency's own precision (for example 0 for JPY); override with `maxFractionDigits`. Use `max` to cap the amount. Input is limited to 15 digits.

Pass `deleteLabel` and `decimalLabel` to localize the keypad's spoken labels.

## Examples

### Filled

Starts with a value through `defaultValue`.

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

```tsx
import { AmountInput } from "@/components/ui/amount-input"

export function AmountInputFilledExample() {
  return (
    <AmountInput currency="USD" locale="en-US" defaultValue="1250.5" />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct AmountInputFilledExample: View {
  var body: some View {
    AmountInputDemo(currency: "USD", locale: "en-US", initial: "1250.5")
  }
}

struct AmountInputDemo: View {
  let currency: String
  let locale: String
  var max: Double?

  @State private var value: String

  init(currency: String, locale: String, initial: String = "", max: Double? = nil) {
    self.currency = currency
    self.locale = locale
    self.max = max
    _value = State(initialValue: initial)
  }

  var body: some View {
    AmountInput(value: $value, currency: currency, max: max)
      .environment(\.locale, Locale(identifier: locale))
  }
}
```

```kotlin
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import com.esuiss.ui.components.AmountInput
import java.util.Locale

@Composable
fun AmountInputFilledExample() {
    AmountInputStory("USD", "en-US", "1250.5")
}

@Composable
fun AmountInputStory(
    currency: String,
    locale: String,
    defaultValue: String = "",
    max: Double? = null,
    enabled: Boolean = true,
) {
    var value by rememberSaveable { mutableStateOf(defaultValue) }
    AmountInput(
        modifier = Modifier.fillMaxWidth(),
        value = value,
        onValueChange = { next, _ -> value = next },
        currency = currency,
        locale = Locale.forLanguageTag(locale),
        max = max,
        enabled = enabled,
    )
}
```

### Controlled

Controlled with `value` and `onValueChange`.

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

```tsx
import * as React from "react"
import { View } from "react-native"
import { AmountInput } from "@/components/ui/amount-input"
import { Text } from "@/components/ui/text"

function ControlledDemo() {
  const [value, setValue] = React.useState("")
  const [amount, setAmount] = React.useState(0)
  return (
    <View className="items-center gap-4">
      <AmountInput
        currency="USD"
        locale="en-US"
        value={value}
        onValueChange={(next, nextAmount) => {
          setValue(next)
          setAmount(nextAmount)
        }}
      />
      <Text className="text-sm text-label-secondary">
        {`value "${value}" · amount ${amount}`}
      </Text>
    </View>
  )
}

export function AmountInputControlledExample() {
  return (
    <ControlledDemo />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct AmountInputControlledDemo: View {
  @State private var value = ""
  @State private var amount: Double = 0

  var body: some View {
    VStack(spacing: 16) {
      AmountInput(value: $value, currency: "USD") { _, next in
        amount = next
      }
      .environment(\.locale, Locale(identifier: "en-US"))
      Text(verbatim: "value \"\(value)\" · amount \(amountText)")
        .textStyle(.sm)
        .foregroundStyle(Color.labelSecondary)
    }
    .frame(maxWidth: .infinity)
  }

  var amountText: String {
    amount.rounded() == amount && abs(amount) < 1e15 ? String(Int64(amount)) : String(amount)
  }
}
```

```kotlin
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableDoubleStateOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import com.esuiss.ui.components.AmountInput
import com.esuiss.ui.components.Text
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography
import java.util.Locale

@Composable
fun AmountInputControlled() {
    var value by rememberSaveable { mutableStateOf("") }
    var amount by rememberSaveable { mutableDoubleStateOf(0.0) }
    Column(
        Modifier.fillMaxWidth(),
        verticalArrangement = Arrangement.spacedBy(16.dp),
        horizontalAlignment = Alignment.CenterHorizontally,
    ) {
        AmountInput(
            modifier = Modifier.fillMaxWidth(),
            value = value,
            onValueChange = { next, nextAmount ->
                value = next
                amount = nextAmount
            },
            currency = "USD",
            locale = Locale.forLanguageTag("en-US"),
        )
        val shown = if (amount % 1.0 == 0.0) amount.toLong().toString() else amount.toString()
        Text(
            "value \"$value\" · amount $shown",
            style = Typography.sm.copy(color = EsuissTheme.colors.labelSecondary),
        )
    }
}
```

### Long amount

A long amount that shrinks to fit.

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

```tsx
import { AmountInput } from "@/components/ui/amount-input"

export function AmountInputLongAmountExample() {
  return (
    <AmountInput currency="USD" locale="en-US" defaultValue="98765432109.99" />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct AmountInputLongAmountExample: View {
  var body: some View {
    AmountInputDemo(currency: "USD", locale: "en-US", initial: "98765432109.99")
  }
}

struct AmountInputDemo: View {
  let currency: String
  let locale: String
  var max: Double?

  @State private var value: String

  init(currency: String, locale: String, initial: String = "", max: Double? = nil) {
    self.currency = currency
    self.locale = locale
    self.max = max
    _value = State(initialValue: initial)
  }

  var body: some View {
    AmountInput(value: $value, currency: currency, max: max)
      .environment(\.locale, Locale(identifier: locale))
  }
}
```

```kotlin
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import com.esuiss.ui.components.AmountInput
import java.util.Locale

@Composable
fun AmountInputLongAmountExample() {
    AmountInputStory("USD", "en-US", "98765432109.99")
}

@Composable
fun AmountInputStory(
    currency: String,
    locale: String,
    defaultValue: String = "",
    max: Double? = null,
    enabled: Boolean = true,
) {
    var value by rememberSaveable { mutableStateOf(defaultValue) }
    AmountInput(
        modifier = Modifier.fillMaxWidth(),
        value = value,
        onValueChange = { next, _ -> value = next },
        currency = currency,
        locale = Locale.forLanguageTag(locale),
        max = max,
        enabled = enabled,
    )
}
```

### Euro

EUR in the `de-DE` locale with a comma decimal separator.

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

```tsx
import { AmountInput } from "@/components/ui/amount-input"

export function AmountInputEuroExample() {
  return (
    <AmountInput currency="EUR" locale="de-DE" defaultValue="1234.5" />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct AmountInputEuroExample: View {
  var body: some View {
    AmountInputDemo(currency: "EUR", locale: "de-DE", initial: "1234.5")
  }
}

struct AmountInputDemo: View {
  let currency: String
  let locale: String
  var max: Double?

  @State private var value: String

  init(currency: String, locale: String, initial: String = "", max: Double? = nil) {
    self.currency = currency
    self.locale = locale
    self.max = max
    _value = State(initialValue: initial)
  }

  var body: some View {
    AmountInput(value: $value, currency: currency, max: max)
      .environment(\.locale, Locale(identifier: locale))
  }
}
```

```kotlin
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import com.esuiss.ui.components.AmountInput
import java.util.Locale

@Composable
fun AmountInputEuroExample() {
    AmountInputStory("EUR", "de-DE", "1234.5")
}

@Composable
fun AmountInputStory(
    currency: String,
    locale: String,
    defaultValue: String = "",
    max: Double? = null,
    enabled: Boolean = true,
) {
    var value by rememberSaveable { mutableStateOf(defaultValue) }
    AmountInput(
        modifier = Modifier.fillMaxWidth(),
        value = value,
        onValueChange = { next, _ -> value = next },
        currency = currency,
        locale = Locale.forLanguageTag(locale),
        max = max,
        enabled = enabled,
    )
}
```

### Turkish lira

TRY in the `tr-TR` locale.

![Preview](https://uim.suiss.app/previews/components-amount-input--turkish-lira.light.webp)

```tsx
import { AmountInput } from "@/components/ui/amount-input"

export function AmountInputTurkishLiraExample() {
  return (
    <AmountInput currency="TRY" locale="tr-TR" defaultValue="2500.75" />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct AmountInputTurkishLiraExample: View {
  var body: some View {
    AmountInputDemo(currency: "TRY", locale: "tr-TR", initial: "2500.75")
  }
}

struct AmountInputDemo: View {
  let currency: String
  let locale: String
  var max: Double?

  @State private var value: String

  init(currency: String, locale: String, initial: String = "", max: Double? = nil) {
    self.currency = currency
    self.locale = locale
    self.max = max
    _value = State(initialValue: initial)
  }

  var body: some View {
    AmountInput(value: $value, currency: currency, max: max)
      .environment(\.locale, Locale(identifier: locale))
  }
}
```

```kotlin
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import com.esuiss.ui.components.AmountInput
import java.util.Locale

@Composable
fun AmountInputTurkishLiraExample() {
    AmountInputStory("TRY", "tr-TR", "2500.75")
}

@Composable
fun AmountInputStory(
    currency: String,
    locale: String,
    defaultValue: String = "",
    max: Double? = null,
    enabled: Boolean = true,
) {
    var value by rememberSaveable { mutableStateOf(defaultValue) }
    AmountInput(
        modifier = Modifier.fillMaxWidth(),
        value = value,
        onValueChange = { next, _ -> value = next },
        currency = currency,
        locale = Locale.forLanguageTag(locale),
        max = max,
        enabled = enabled,
    )
}
```

### Yen

JPY, which has no decimal key.

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

```tsx
import { AmountInput } from "@/components/ui/amount-input"

export function AmountInputYenExample() {
  return (
    <AmountInput currency="JPY" locale="ja-JP" defaultValue="15000" />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct AmountInputYenExample: View {
  var body: some View {
    AmountInputDemo(currency: "JPY", locale: "ja-JP", initial: "15000")
  }
}

struct AmountInputDemo: View {
  let currency: String
  let locale: String
  var max: Double?

  @State private var value: String

  init(currency: String, locale: String, initial: String = "", max: Double? = nil) {
    self.currency = currency
    self.locale = locale
    self.max = max
    _value = State(initialValue: initial)
  }

  var body: some View {
    AmountInput(value: $value, currency: currency, max: max)
      .environment(\.locale, Locale(identifier: locale))
  }
}
```

```kotlin
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import com.esuiss.ui.components.AmountInput
import java.util.Locale

@Composable
fun AmountInputYenExample() {
    AmountInputStory("JPY", "ja-JP", "15000")
}

@Composable
fun AmountInputStory(
    currency: String,
    locale: String,
    defaultValue: String = "",
    max: Double? = null,
    enabled: Boolean = true,
) {
    var value by rememberSaveable { mutableStateOf(defaultValue) }
    AmountInput(
        modifier = Modifier.fillMaxWidth(),
        value = value,
        onValueChange = { next, _ -> value = next },
        currency = currency,
        locale = Locale.forLanguageTag(locale),
        max = max,
        enabled = enabled,
    )
}
```

### With max

Capped at 500 with `max`; larger entries are rejected.

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

```tsx
import { AmountInput } from "@/components/ui/amount-input"

export function AmountInputWithMaxExample() {
  return (
    <AmountInput currency="USD" locale="en-US" max={500} />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct AmountInputWithMaxExample: View {
  var body: some View {
    AmountInputDemo(currency: "USD", locale: "en-US", max: 500)
  }
}

struct AmountInputDemo: View {
  let currency: String
  let locale: String
  var max: Double?

  @State private var value: String

  init(currency: String, locale: String, initial: String = "", max: Double? = nil) {
    self.currency = currency
    self.locale = locale
    self.max = max
    _value = State(initialValue: initial)
  }

  var body: some View {
    AmountInput(value: $value, currency: currency, max: max)
      .environment(\.locale, Locale(identifier: locale))
  }
}
```

```kotlin
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import com.esuiss.ui.components.AmountInput
import java.util.Locale

@Composable
fun AmountInputWithMaxExample() {
    AmountInputStory("USD", "en-US", max = 500.0)
}

@Composable
fun AmountInputStory(
    currency: String,
    locale: String,
    defaultValue: String = "",
    max: Double? = null,
    enabled: Boolean = true,
) {
    var value by rememberSaveable { mutableStateOf(defaultValue) }
    AmountInput(
        modifier = Modifier.fillMaxWidth(),
        value = value,
        onValueChange = { next, _ -> value = next },
        currency = currency,
        locale = Locale.forLanguageTag(locale),
        max = max,
        enabled = enabled,
    )
}
```

### Disabled

A disabled input with a dimmed amount and keypad.

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

```tsx
import { AmountInput } from "@/components/ui/amount-input"

export function AmountInputDisabledExample() {
  return (
    <AmountInput currency="USD" locale="en-US" defaultValue="42" disabled />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct AmountInputDisabledExample: View {
  var body: some View {
    AmountInputDemo(currency: "USD", locale: "en-US", initial: "42")
      .disabled(true)
  }
}

struct AmountInputDemo: View {
  let currency: String
  let locale: String
  var max: Double?

  @State private var value: String

  init(currency: String, locale: String, initial: String = "", max: Double? = nil) {
    self.currency = currency
    self.locale = locale
    self.max = max
    _value = State(initialValue: initial)
  }

  var body: some View {
    AmountInput(value: $value, currency: currency, max: max)
      .environment(\.locale, Locale(identifier: locale))
  }
}
```

```kotlin
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import com.esuiss.ui.components.AmountInput
import java.util.Locale

@Composable
fun AmountInputDisabledExample() {
    AmountInputStory("USD", "en-US", "42", enabled = false)
}

@Composable
fun AmountInputStory(
    currency: String,
    locale: String,
    defaultValue: String = "",
    max: Double? = null,
    enabled: Boolean = true,
) {
    var value by rememberSaveable { mutableStateOf(defaultValue) }
    AmountInput(
        modifier = Modifier.fillMaxWidth(),
        value = value,
        onValueChange = { next, _ -> value = next },
        currency = currency,
        locale = Locale.forLanguageTag(locale),
        max = max,
        enabled = enabled,
    )
}
```

## API Reference

### AmountInput

## Accessibility

- The amount text is a polite live region, so changes are announced.
- Its label is the formatted amount, prefixed with `accessibilityLabel` when given.
- Keypad keys announce their digit; the delete key is disabled while the value is empty.

## Notes

- The shake animation respects the system Reduce Motion setting.
- Uses tabular numerals so digits do not shift as they change.
- Uses `text-label` and `text-label-tertiary` tokens; light and dark follow the system appearance.