# Date Picker

A date field that opens a drawer with day, month and year wheels ordered for the locale.

Date Picker is an open-source mobile pattern from suiss/uim: components composed into a flow 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/patterns/date-picker

![Preview](https://uim.suiss.app/previews/patterns-date-picker--default.light.webp)

```tsx
import { DatePicker } from "@/components/patterns/date-picker"

export function DatePickerExample() {
  return (
    <DatePicker accessibilityLabel="Date" />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct DatePickerDemo: View {
  var placeholder: LocalizedStringKey = "Pick a date"
  var fromYear: Int?
  var toYear: Int?
  var title: LocalizedStringKey?
  var showCloseButton = false
  var closeLabel: LocalizedStringKey?

  @State private var value: Date?

  init(
    value: Date? = nil,
    placeholder: LocalizedStringKey = "Pick a date",
    fromYear: Int? = nil,
    toYear: Int? = nil,
    title: LocalizedStringKey? = nil,
    showCloseButton: Bool = false,
    closeLabel: LocalizedStringKey? = nil
  ) {
    _value = State(initialValue: value)
    self.placeholder = placeholder
    self.fromYear = fromYear
    self.toYear = toYear
    self.title = title
    self.showCloseButton = showCloseButton
    self.closeLabel = closeLabel
  }

  var body: some View {
    DatePickerField(
      selection: $value,
      placeholder: placeholder,
      fromYear: fromYear,
      toYear: toYear,
      title: title,
      showCloseButton: showCloseButton,
      closeLabel: closeLabel
    )
    .fixedSize()
    .accessibilityLabel(Text("Date"))
  }
}
```

```kotlin
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import com.esuiss.ui.patterns.DatePicker
import java.util.Calendar
import java.util.Date
import java.util.Locale

@Composable
fun DatePickerDemo(
    initial: Long? = null,
    locale: Locale = Locale.getDefault(),
    placeholder: String = "Pick a date",
    fromYear: Int = Calendar.getInstance().get(Calendar.YEAR) - 100,
    toYear: Int = Calendar.getInstance().get(Calendar.YEAR) + 10,
    title: String? = null,
    enabled: Boolean = true,
    invalid: Boolean? = null,
    floating: Boolean = false,
    showCloseButton: Boolean = false,
    closeLabel: String? = null,
) {
    var value by rememberSaveable { mutableStateOf(initial) }
    DatePicker(
        value = value?.let(::Date),
        onValueChange = { value = it.time },
        modifier = Modifier.semantics { contentDescription = "Date" },
        placeholder = placeholder,
        locale = locale,
        fromYear = fromYear,
        toYear = toYear,
        title = title,
        enabled = enabled,
        invalid = invalid,
        floating = floating,
        showCloseButton = showCloseButton,
        closeLabel = closeLabel,
    )
}
```

`DatePicker` renders a field-style `DrawerTrigger` with a calendar icon and the selected date formatted with `Intl.DateTimeFormat` in the `medium` date style. The trigger sizes itself to its content rather than filling the width; pass `className` to change that. Pressing it opens a `Drawer` with three `WheelPicker` columns.

The column order follows the locale's short date format, falling back to month, day, year. Month names come from the locale, and the day column shrinks or grows with the chosen month and year, clamping the day when needed.

## Installation

```bash title="Terminal"
npx @esuiss/uim@latest add date-picker
```

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

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

The CLI also adds what it builds on: [Drawer](/docs/components/drawer), [Icon](/docs/components/icon), [Text](/docs/components/text), [Wheel Picker](/docs/components/wheel-picker).

### Manual

**Uniwind**

1. Install the dependencies:

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

2. Add the pieces it builds on: [Drawer](/docs/components/drawer), [Icon](/docs/components/icon), [Text](/docs/components/text), [Wheel Picker](/docs/components/wheel-picker).

3. Copy the source into `components/patterns/date-picker.tsx`:

```tsx title="uniwind/components/patterns/date-picker.tsx"
import { cn } from "cn"
import { CalendarBlankIcon } from "phosphor-react-native"
import * as React from "react"
import {
  Drawer,
  DrawerContent,
  DrawerHeader,
  DrawerTitle,
  DrawerTrigger,
} from "@/components/ui/drawer"
import { Icon } from "@/components/ui/icon"
import { Text } from "@/components/ui/text"
import {
  WheelPicker,
  WheelPickerColumn,
  WheelPickerItem,
} from "@/components/ui/wheel-picker"

type DatePart = "day" | "month" | "year"

function daysInMonth(year: number, month: number) {
  return new Date(year, month + 1, 0).getDate()
}

function partOrder(locale: string | undefined): DatePart[] {
  try {
    const order = new Intl.DateTimeFormat(locale, { dateStyle: "short" })
      .formatToParts(new Date(2000, 11, 31))
      .map((part) => part.type)
      .filter(
        (type): type is DatePart =>
          type === "day" || type === "month" || type === "year"
      )
    return order.length === 3 ? order : ["month", "day", "year"]
  } catch {
    return ["month", "day", "year"]
  }
}

function DatePicker({
  value: valueProp,
  defaultValue,
  onValueChange,
  placeholder = "Pick a date",
  locale,
  fromYear = new Date().getFullYear() - 100,
  toYear = new Date().getFullYear() + 10,
  title,
  disabled,
  floating,
  showCloseButton = false,
  closeLabel,
  invalid,
  className,
  accessibilityLabel,
  accessibilityLabelledBy,
}: {
  value?: Date | null
  defaultValue?: Date | null
  onValueChange?: (value: Date | null) => void
  placeholder?: string
  locale?: string
  fromYear?: number
  toYear?: number
  title?: string
  disabled?: boolean
  floating?: boolean
  showCloseButton?: boolean
  closeLabel?: string
  invalid?: boolean
  className?: string
  accessibilityLabel?: string
  accessibilityLabelledBy?: string
}) {
  const [uncontrolledValue, setUncontrolledValue] = React.useState(
    defaultValue ?? null
  )
  const value = valueProp === undefined ? uncontrolledValue : valueProp
  const [open, setOpen] = React.useState(false)

  const select = (next: Date | null) => {
    if (valueProp === undefined) setUncontrolledValue(next)
    onValueChange?.(next)
  }

  const label = value
    ? new Intl.DateTimeFormat(locale, { dateStyle: "medium" }).format(value)
    : placeholder

  return (
    <Drawer open={open} onOpenChange={setOpen} floating={floating}>
      <DrawerTrigger
        disabled={disabled}
        accessibilityLabel={accessibilityLabel}
        accessibilityLabelledBy={accessibilityLabelledBy}
        className={cn(
          "h-11 flex-row items-center gap-2 self-start rounded-lg border border-transparent bg-control px-3",
          invalid && "border-danger bg-danger/5 dark:bg-danger/10",
          disabled && "bg-control-disabled",
          className
        )}
      >
        <Icon
          as={CalendarBlankIcon}
          className={cn(
            "size-4 shrink-0 text-label-secondary",
            disabled && "text-label-quaternary"
          )}
        />
        <Text
          numberOfLines={1}
          className={cn(
            "shrink text-base text-label",
            !value && "text-label-secondary",
            disabled && "text-label-quaternary"
          )}
        >
          {label}
        </Text>
      </DrawerTrigger>
      <DrawerContent
        showCloseButton={showCloseButton}
        closeLabel={closeLabel}
        accessibilityLabel={
          title ? undefined : (accessibilityLabel ?? placeholder)
        }
        className={cn(!floating && "rounded-t-none")}
      >
        {title ? (
          <DrawerHeader>
            <DrawerTitle>{title}</DrawerTitle>
          </DrawerHeader>
        ) : null}
        <DateWheels
          value={value ?? new Date()}
          onValueChange={select}
          locale={locale}
          fromYear={fromYear}
          toYear={toYear}
          className={cn(showCloseButton && !title && "mt-12")}
        />
      </DrawerContent>
    </Drawer>
  )
}

function DateWheels({
  value,
  onValueChange,
  locale,
  fromYear,
  toYear,
  className,
}: {
  value: Date
  onValueChange: (value: Date) => void
  locale?: string
  fromYear: number
  toYear: number
  className?: string
}) {
  const year = value.getFullYear()
  const month = value.getMonth()
  const day = value.getDate()

  const order = React.useMemo(() => partOrder(locale), [locale])
  const monthNames = React.useMemo(() => {
    const format = new Intl.DateTimeFormat(locale, { month: "long" })
    return Array.from({ length: 12 }, (_, index) =>
      format.format(new Date(2000, index, 1))
    )
  }, [locale])

  const days = Array.from(
    { length: daysInMonth(year, month) },
    (_, index) => index + 1
  )
  const years = React.useMemo(
    () =>
      Array.from(
        { length: toYear - fromYear + 1 },
        (_, index) => fromYear + index
      ),
    [fromYear, toYear]
  )

  const update = (next: Partial<Record<DatePart, number>>) => {
    const nextYear = next.year ?? year
    const nextMonth = next.month ?? month
    const nextDay = Math.min(next.day ?? day, daysInMonth(nextYear, nextMonth))
    onValueChange(new Date(nextYear, nextMonth, nextDay))
  }

  const columns: Record<DatePart, React.ReactNode> = {
    day: (
      <WheelPickerColumn
        key="day"
        accessibilityLabel="Day"
        value={String(day)}
        onValueChange={(next) => update({ day: Number(next) })}
        className="w-12"
      >
        {days.map((item) => (
          <WheelPickerItem
            key={item}
            value={String(item)}
            className="justify-end px-0"
          >
            {item}
          </WheelPickerItem>
        ))}
      </WheelPickerColumn>
    ),
    month: (
      <WheelPickerColumn
        key="month"
        accessibilityLabel="Month"
        value={String(month)}
        onValueChange={(next) => update({ month: Number(next) })}
        className="w-24"
      >
        {monthNames.map((name, index) => (
          <WheelPickerItem
            key={name}
            value={String(index)}
            className="justify-start px-0"
          >
            {name}
          </WheelPickerItem>
        ))}
      </WheelPickerColumn>
    ),
    year: (
      <WheelPickerColumn
        key="year"
        accessibilityLabel="Year"
        value={String(year)}
        onValueChange={(next) => update({ year: Number(next) })}
        className="w-16"
      >
        {years.map((item) => (
          <WheelPickerItem
            key={item}
            value={String(item)}
            className="justify-start px-0"
          >
            {item}
          </WheelPickerItem>
        ))}
      </WheelPickerColumn>
    ),
  }

  return (
    <WheelPicker className={cn("mx-4 my-4 gap-6", className)}>
      {order.map((part) => columns[part])}
    </WheelPicker>
  )
}

export { DatePicker }
```

4. Update the import paths to match your project.

**NativeWind**

1. Install the dependencies:

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

2. Add the pieces it builds on: [Drawer](/docs/components/drawer), [Icon](/docs/components/icon), [Text](/docs/components/text), [Wheel Picker](/docs/components/wheel-picker).

3. Copy the source into `components/patterns/date-picker.tsx`:

```tsx title="nativewind/components/patterns/date-picker.tsx"
import { cn } from "cn"
import { CalendarBlankIcon } from "phosphor-react-native"
import * as React from "react"
import {
  Drawer,
  DrawerContent,
  DrawerHeader,
  DrawerTitle,
  DrawerTrigger,
} from "@/components/ui/drawer"
import { Icon } from "@/components/ui/icon"
import { Text } from "@/components/ui/text"
import {
  WheelPicker,
  WheelPickerColumn,
  WheelPickerItem,
} from "@/components/ui/wheel-picker"

type DatePart = "day" | "month" | "year"

function daysInMonth(year: number, month: number) {
  return new Date(year, month + 1, 0).getDate()
}

function partOrder(locale: string | undefined): DatePart[] {
  try {
    const order = new Intl.DateTimeFormat(locale, { dateStyle: "short" })
      .formatToParts(new Date(2000, 11, 31))
      .map((part) => part.type)
      .filter(
        (type): type is DatePart =>
          type === "day" || type === "month" || type === "year"
      )
    return order.length === 3 ? order : ["month", "day", "year"]
  } catch {
    return ["month", "day", "year"]
  }
}

function DatePicker({
  value: valueProp,
  defaultValue,
  onValueChange,
  placeholder = "Pick a date",
  locale,
  fromYear = new Date().getFullYear() - 100,
  toYear = new Date().getFullYear() + 10,
  title,
  disabled,
  floating,
  showCloseButton = false,
  closeLabel,
  invalid,
  className,
  accessibilityLabel,
  accessibilityLabelledBy,
}: {
  value?: Date | null
  defaultValue?: Date | null
  onValueChange?: (value: Date | null) => void
  placeholder?: string
  locale?: string
  fromYear?: number
  toYear?: number
  title?: string
  disabled?: boolean
  floating?: boolean
  showCloseButton?: boolean
  closeLabel?: string
  invalid?: boolean
  className?: string
  accessibilityLabel?: string
  accessibilityLabelledBy?: string
}) {
  const [uncontrolledValue, setUncontrolledValue] = React.useState(
    defaultValue ?? null
  )
  const value = valueProp === undefined ? uncontrolledValue : valueProp
  const [open, setOpen] = React.useState(false)

  const select = (next: Date | null) => {
    if (valueProp === undefined) setUncontrolledValue(next)
    onValueChange?.(next)
  }

  const label = value
    ? new Intl.DateTimeFormat(locale, { dateStyle: "medium" }).format(value)
    : placeholder

  return (
    <Drawer open={open} onOpenChange={setOpen} floating={floating}>
      <DrawerTrigger
        disabled={disabled}
        accessibilityLabel={accessibilityLabel}
        accessibilityLabelledBy={accessibilityLabelledBy}
        className={cn(
          "h-11 flex-row items-center gap-2 self-start rounded-lg border border-transparent bg-control px-3",
          invalid && "border-danger bg-danger-5 dark:bg-danger-10",
          disabled && "bg-control-disabled",
          className
        )}
      >
        <Icon
          as={CalendarBlankIcon}
          className={cn(
            "size-4 shrink-0 text-label-secondary",
            disabled && "text-label-quaternary"
          )}
        />
        <Text
          numberOfLines={1}
          className={cn(
            "shrink text-base text-label",
            !value && "text-label-secondary",
            disabled && "text-label-quaternary"
          )}
        >
          {label}
        </Text>
      </DrawerTrigger>
      <DrawerContent
        showCloseButton={showCloseButton}
        closeLabel={closeLabel}
        accessibilityLabel={
          title ? undefined : (accessibilityLabel ?? placeholder)
        }
        className={cn(!floating && "rounded-t-none")}
      >
        {title ? (
          <DrawerHeader>
            <DrawerTitle>{title}</DrawerTitle>
          </DrawerHeader>
        ) : null}
        <DateWheels
          value={value ?? new Date()}
          onValueChange={select}
          locale={locale}
          fromYear={fromYear}
          toYear={toYear}
          className={cn(showCloseButton && !title && "mt-12")}
        />
      </DrawerContent>
    </Drawer>
  )
}

function DateWheels({
  value,
  onValueChange,
  locale,
  fromYear,
  toYear,
  className,
}: {
  value: Date
  onValueChange: (value: Date) => void
  locale?: string
  fromYear: number
  toYear: number
  className?: string
}) {
  const year = value.getFullYear()
  const month = value.getMonth()
  const day = value.getDate()

  const order = React.useMemo(() => partOrder(locale), [locale])
  const monthNames = React.useMemo(() => {
    const format = new Intl.DateTimeFormat(locale, { month: "long" })
    return Array.from({ length: 12 }, (_, index) =>
      format.format(new Date(2000, index, 1))
    )
  }, [locale])

  const days = Array.from(
    { length: daysInMonth(year, month) },
    (_, index) => index + 1
  )
  const years = React.useMemo(
    () =>
      Array.from(
        { length: toYear - fromYear + 1 },
        (_, index) => fromYear + index
      ),
    [fromYear, toYear]
  )

  const update = (next: Partial<Record<DatePart, number>>) => {
    const nextYear = next.year ?? year
    const nextMonth = next.month ?? month
    const nextDay = Math.min(next.day ?? day, daysInMonth(nextYear, nextMonth))
    onValueChange(new Date(nextYear, nextMonth, nextDay))
  }

  const columns: Record<DatePart, React.ReactNode> = {
    day: (
      <WheelPickerColumn
        key="day"
        accessibilityLabel="Day"
        value={String(day)}
        onValueChange={(next) => update({ day: Number(next) })}
        className="w-12"
      >
        {days.map((item) => (
          <WheelPickerItem
            key={item}
            value={String(item)}
            className="justify-end px-0"
          >
            {item}
          </WheelPickerItem>
        ))}
      </WheelPickerColumn>
    ),
    month: (
      <WheelPickerColumn
        key="month"
        accessibilityLabel="Month"
        value={String(month)}
        onValueChange={(next) => update({ month: Number(next) })}
        className="w-24"
      >
        {monthNames.map((name, index) => (
          <WheelPickerItem
            key={name}
            value={String(index)}
            className="justify-start px-0"
          >
            {name}
          </WheelPickerItem>
        ))}
      </WheelPickerColumn>
    ),
    year: (
      <WheelPickerColumn
        key="year"
        accessibilityLabel="Year"
        value={String(year)}
        onValueChange={(next) => update({ year: Number(next) })}
        className="w-16"
      >
        {years.map((item) => (
          <WheelPickerItem
            key={item}
            value={String(item)}
            className="justify-start px-0"
          >
            {item}
          </WheelPickerItem>
        ))}
      </WheelPickerColumn>
    ),
  }

  return (
    <WheelPicker className={cn("mx-4 my-4 gap-6", className)}>
      {order.map((part) => columns[part])}
    </WheelPicker>
  )
}

export { DatePicker }
```

4. Update the import paths to match your project.

**StyleSheet**

1. Install the dependencies:

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

2. Add the pieces it builds on: [Drawer](/docs/components/drawer), [Icon](/docs/components/icon), [Text](/docs/components/text), [Wheel Picker](/docs/components/wheel-picker).

3. Copy the source into `components/patterns/date-picker.tsx`:

```tsx title="stylesheet/components/patterns/date-picker.tsx"
import { CalendarBlankIcon } from "phosphor-react-native"
import * as React from "react"
import { type StyleProp, StyleSheet, type ViewStyle } from "react-native"
import {
  Drawer,
  DrawerContent,
  DrawerHeader,
  DrawerTitle,
  DrawerTrigger,
} from "@/components/ui/drawer"
import { Icon } from "@/components/ui/icon"
import { Text } from "@/components/ui/text"
import { fontSize, radius, useTheme } from "@/components/ui/theme"
import {
  WheelPicker,
  WheelPickerColumn,
  WheelPickerItem,
} from "@/components/ui/wheel-picker"

const styles = StyleSheet.create({
  trigger: {
    height: 44,
    flexDirection: "row",
    alignSelf: "flex-start",
    alignItems: "center",
    gap: 8,
    borderRadius: radius.lg,
    borderWidth: 1,
    borderColor: "transparent",
    paddingHorizontal: 12,
  },
  icon: { flexShrink: 0 },
  label: { flexShrink: 1, ...fontSize.base },
  docked: { borderTopLeftRadius: 0, borderTopRightRadius: 0 },
  wheels: { margin: 16, gap: 24 },
  spaced: { marginTop: 48 },
  day: { width: 48 },
  month: { width: 96 },
  year: { width: 64 },
  end: { justifyContent: "flex-end", paddingHorizontal: 0 },
  start: { justifyContent: "flex-start", paddingHorizontal: 0 },
})

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

type DatePart = "day" | "month" | "year"

function daysInMonth(year: number, month: number) {
  return new Date(year, month + 1, 0).getDate()
}

function partOrder(locale: string | undefined): DatePart[] {
  try {
    const order = new Intl.DateTimeFormat(locale, { dateStyle: "short" })
      .formatToParts(new Date(2000, 11, 31))
      .map((part) => part.type)
      .filter(
        (type): type is DatePart =>
          type === "day" || type === "month" || type === "year"
      )
    return order.length === 3 ? order : ["month", "day", "year"]
  } catch {
    return ["month", "day", "year"]
  }
}

function DatePicker({
  value: valueProp,
  defaultValue,
  onValueChange,
  placeholder = "Pick a date",
  locale,
  fromYear = new Date().getFullYear() - 100,
  toYear = new Date().getFullYear() + 10,
  title,
  disabled,
  floating,
  showCloseButton = false,
  closeLabel,
  invalid,
  style,
  accessibilityLabel,
  accessibilityLabelledBy,
}: {
  value?: Date | null
  defaultValue?: Date | null
  onValueChange?: (value: Date | null) => void
  placeholder?: string
  locale?: string
  fromYear?: number
  toYear?: number
  title?: string
  disabled?: boolean
  floating?: boolean
  showCloseButton?: boolean
  closeLabel?: string
  invalid?: boolean
  style?: StyleProp<ViewStyle>
  accessibilityLabel?: string
  accessibilityLabelledBy?: string
}) {
  const { colors, isDark } = useTheme()
  const [uncontrolledValue, setUncontrolledValue] = React.useState(
    defaultValue ?? null
  )
  const value = valueProp === undefined ? uncontrolledValue : valueProp
  const [open, setOpen] = React.useState(false)

  const select = (next: Date | null) => {
    if (valueProp === undefined) setUncontrolledValue(next)
    onValueChange?.(next)
  }

  const label = value
    ? new Intl.DateTimeFormat(locale, { dateStyle: "medium" }).format(value)
    : placeholder

  return (
    <Drawer open={open} onOpenChange={setOpen} floating={floating}>
      <DrawerTrigger
        disabled={disabled}
        accessibilityLabel={accessibilityLabel}
        accessibilityLabelledBy={accessibilityLabelledBy}
        style={[
          styles.trigger,
          { backgroundColor: colors.control },
          invalid && {
            borderColor: colors.danger,
            backgroundColor: withAlpha(colors.danger, isDark ? 0.1 : 0.05),
          },
          disabled && { backgroundColor: colors.controlDisabled },
          style,
        ]}
      >
        <Icon
          as={CalendarBlankIcon}
          size={16}
          color={disabled ? colors.labelQuaternary : colors.labelSecondary}
          style={styles.icon}
        />
        <Text
          numberOfLines={1}
          style={[
            styles.label,
            {
              color: disabled
                ? colors.labelQuaternary
                : value
                  ? colors.label
                  : colors.labelSecondary,
            },
          ]}
        >
          {label}
        </Text>
      </DrawerTrigger>
      <DrawerContent
        showCloseButton={showCloseButton}
        closeLabel={closeLabel}
        accessibilityLabel={
          title ? undefined : (accessibilityLabel ?? placeholder)
        }
        style={floating ? undefined : styles.docked}
      >
        {title ? (
          <DrawerHeader>
            <DrawerTitle>{title}</DrawerTitle>
          </DrawerHeader>
        ) : null}
        <DateWheels
          value={value ?? new Date()}
          onValueChange={select}
          locale={locale}
          fromYear={fromYear}
          toYear={toYear}
          style={showCloseButton && !title ? styles.spaced : undefined}
        />
      </DrawerContent>
    </Drawer>
  )
}

function DateWheels({
  value,
  onValueChange,
  locale,
  fromYear,
  toYear,
  style,
}: {
  value: Date
  onValueChange: (value: Date) => void
  locale?: string
  fromYear: number
  toYear: number
  style?: StyleProp<ViewStyle>
}) {
  const year = value.getFullYear()
  const month = value.getMonth()
  const day = value.getDate()

  const order = React.useMemo(() => partOrder(locale), [locale])
  const monthNames = React.useMemo(() => {
    const format = new Intl.DateTimeFormat(locale, { month: "long" })
    return Array.from({ length: 12 }, (_, index) =>
      format.format(new Date(2000, index, 1))
    )
  }, [locale])

  const days = Array.from(
    { length: daysInMonth(year, month) },
    (_, index) => index + 1
  )
  const years = React.useMemo(
    () =>
      Array.from(
        { length: toYear - fromYear + 1 },
        (_, index) => fromYear + index
      ),
    [fromYear, toYear]
  )

  const update = (next: Partial<Record<DatePart, number>>) => {
    const nextYear = next.year ?? year
    const nextMonth = next.month ?? month
    const nextDay = Math.min(next.day ?? day, daysInMonth(nextYear, nextMonth))
    onValueChange(new Date(nextYear, nextMonth, nextDay))
  }

  const columns: Record<DatePart, React.ReactNode> = {
    day: (
      <WheelPickerColumn
        key="day"
        accessibilityLabel="Day"
        value={String(day)}
        onValueChange={(next) => update({ day: Number(next) })}
        style={styles.day}
      >
        {days.map((item) => (
          <WheelPickerItem key={item} value={String(item)} style={styles.end}>
            {item}
          </WheelPickerItem>
        ))}
      </WheelPickerColumn>
    ),
    month: (
      <WheelPickerColumn
        key="month"
        accessibilityLabel="Month"
        value={String(month)}
        onValueChange={(next) => update({ month: Number(next) })}
        style={styles.month}
      >
        {monthNames.map((name, index) => (
          <WheelPickerItem
            key={name}
            value={String(index)}
            style={styles.start}
          >
            {name}
          </WheelPickerItem>
        ))}
      </WheelPickerColumn>
    ),
    year: (
      <WheelPickerColumn
        key="year"
        accessibilityLabel="Year"
        value={String(year)}
        onValueChange={(next) => update({ year: Number(next) })}
        style={styles.year}
      >
        {years.map((item) => (
          <WheelPickerItem key={item} value={String(item)} style={styles.start}>
            {item}
          </WheelPickerItem>
        ))}
      </WheelPickerColumn>
    ),
  }

  return (
    <WheelPicker style={[styles.wheels, style]}>
      {order.map((part) => columns[part])}
    </WheelPicker>
  )
}

export { DatePicker }
```

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/Patterns/DatePicker.swift"
import PhosphorSwift
import SwiftUI

enum DatePart: Hashable, Sendable {
  case day, month, year

  static func order(locale: Locale) -> [DatePart] {
    let format = DateFormatter.dateFormat(fromTemplate: "yMd", options: 0, locale: locale) ?? ""
    var parts: [DatePart] = []
    for character in format {
      let part: DatePart? = switch character {
      case "d": .day
      case "M", "L": .month
      case "y": .year
      default: nil
      }
      if let part, !parts.contains(part) { parts.append(part) }
    }
    return parts.count == 3 ? parts : [.month, .day, .year]
  }
}

enum DateWheelMath {
  static func days(year: Int, month: Int, calendar: Foundation.Calendar) -> Int {
    guard let date = calendar.date(from: DateComponents(year: year, month: month, day: 1)) else { return 31 }
    return calendar.range(of: .day, in: .month, for: date)?.count ?? 31
  }

  static func update(_ date: Date, year: Int? = nil, month: Int? = nil, day: Int? = nil, calendar: Foundation.Calendar) -> Date {
    let current = calendar.dateComponents([.year, .month, .day], from: date)
    let nextYear = year ?? current.year ?? 2000
    let nextMonth = month ?? current.month ?? 1
    let nextDay = min(day ?? current.day ?? 1, days(year: nextYear, month: nextMonth, calendar: calendar))
    return calendar.date(from: DateComponents(year: nextYear, month: nextMonth, day: nextDay)) ?? date
  }
}

public struct DatePickerField: View {
  let selection: Binding<Date?>
  let placeholder: LocalizedStringKey
  let fromYear: Int
  let toYear: Int
  let title: LocalizedStringKey?
  let showCloseButton: Bool
  let closeLabel: LocalizedStringKey?

  @State private var open = false
  @CompactLayout private var compact
  @Environment(\.isEnabled) private var isEnabled
  @Environment(\.isInvalid) private var invalid
  @Environment(\.colorScheme) private var colorScheme
  @Environment(\.locale) private var locale

  public init(
    selection: Binding<Date?>,
    placeholder: LocalizedStringKey = "Pick a date",
    fromYear: Int? = nil,
    toYear: Int? = nil,
    title: LocalizedStringKey? = nil,
    showCloseButton: Bool = false,
    closeLabel: LocalizedStringKey? = nil
  ) {
    let year = Foundation.Calendar.current.component(.year, from: Date())
    self.selection = selection
    self.placeholder = placeholder
    self.fromYear = fromYear ?? year - 100
    self.toYear = toYear ?? year + 10
    self.title = title
    self.showCloseButton = showCloseButton
    self.closeLabel = closeLabel
  }

  public var body: some View {
    let binding = selection
    let isOpen = $open
    trigger
      .drawer(isPresented: $open.gated(compact)) {
        DatePickerSheet(
          selection: binding,
          fromYear: fromYear,
          toYear: toYear,
          title: title,
          showCloseButton: showCloseButton,
          closeLabel: closeLabel
        )
        .environment(\.locale, locale)
      }
      .popover(isPresented: $open.gated(!compact)) {
        DateCalendar(
          selection: Binding(
            get: { binding.wrappedValue },
            set: { value in
              binding.wrappedValue = value
              isOpen.wrappedValue = false
            }
          ),
          startMonth: Foundation.Calendar.current.date(from: DateComponents(year: fromYear, month: 1)),
          endMonth: Foundation.Calendar.current.date(from: DateComponents(year: toYear, month: 12))
        )
        .environment(\.calendarTransparent, true)
        .environment(\.locale, locale)
        .presentationCompactAdaptation(.popover)
        .presentationBackground(Color.surfaceRaised)
      }
  }

  private var label: Text {
    guard let value = selection.wrappedValue else { return Text(placeholder) }
    return Text(value.formatted(Date.FormatStyle(date: .abbreviated, time: .omitted).locale(locale)))
  }

  private var trigger: some View {
    let shape = RoundedRectangle(cornerRadius: Radius.lg, style: .continuous)
    let empty = selection.wrappedValue == nil
    return Button {
      open = true
    } label: {
      HStack(spacing: 8) {
        Ph.calendarBlank.regular
          .frame(width: 16, height: 16)
          .foregroundStyle(isEnabled ? Color.labelSecondary : .labelQuaternary)
          .accessibilityHidden(true)
        label
          .font(TextStyle.base.font())
          .tracking(TextStyle.base.letterSpacing)
          .lineLimit(1)
          .foregroundStyle(!isEnabled ? Color.labelQuaternary : empty ? .labelSecondary : .label)
          .frame(maxWidth: .infinity, alignment: .leading)
      }
      .padding(.horizontal, 12)
      .frame(height: 44)
      .background(background, in: shape)
      .overlay {
        if invalid { shape.strokeBorder(Color.danger) }
      }
      .contentShape(shape)
    }
    .buttonStyle(.plain)
    .accessibilityHint(Text("Shows date picker"))
  }

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

struct DatePickerSheet: View {
  let selection: Binding<Date?>
  let fromYear: Int
  let toYear: Int
  let title: LocalizedStringKey?
  let showCloseButton: Bool
  let closeLabel: LocalizedStringKey?

  var body: some View {
    DrawerContent(showCloseButton: showCloseButton, closeLabel: closeLabel) {
      if let title {
        DrawerHeader {
          DrawerTitle(title)
        }
      }
      DateWheels(
        selection: Binding(
          get: { selection.wrappedValue ?? Date() },
          set: { selection.wrappedValue = $0 }
        ),
        fromYear: fromYear,
        toYear: toYear
      )
      .padding(16)
      .padding(.top, showCloseButton && title == nil ? 48 : 0)
    }
  }
}

struct DateWheels: View {
  let selection: Binding<Date>
  let fromYear: Int
  let toYear: Int

  @Environment(\.locale) private var locale
  @Environment(\.calendar) private var environmentCalendar

  private var calendar: Foundation.Calendar {
    var resolved = Foundation.Calendar(identifier: .gregorian)
    resolved.locale = locale
    resolved.timeZone = environmentCalendar.timeZone
    return resolved
  }

  var body: some View {
    let calendar = calendar
    let components = calendar.dateComponents([.year, .month, .day], from: selection.wrappedValue)
    let year = components.year ?? fromYear
    let month = components.month ?? 1
    let day = components.day ?? 1
    let binding = selection
    WheelPicker(spacing: 24) {
      ForEach(DatePart.order(locale: locale), id: \.self) { part in
        switch part {
        case .day:
          WheelPickerColumn(
            selection: Binding(
              get: { day },
              set: { binding.wrappedValue = DateWheelMath.update(binding.wrappedValue, day: $0, calendar: calendar) }
            ),
            alignment: .trailing
          ) {
            ForEach(1...DateWheelMath.days(year: year, month: month, calendar: calendar), id: \.self) { value in
              WheelPickerItem(verbatim: String(value), value: value)
            }
          }
          .frame(minWidth: 48, alignment: .trailing)
          .accessibilityLabel(Text("Day"))
        case .month:
          WheelPickerColumn(
            selection: Binding(
              get: { month },
              set: { binding.wrappedValue = DateWheelMath.update(binding.wrappedValue, month: $0, calendar: calendar) }
            ),
            alignment: .leading
          ) {
            ForEach(Array(calendar.standaloneMonthSymbols.enumerated()), id: \.offset) { index, name in
              WheelPickerItem(verbatim: name, value: index + 1)
            }
          }
          .frame(minWidth: 96, alignment: .leading)
          .accessibilityLabel(Text("Month"))
        case .year:
          WheelPickerColumn(
            selection: Binding(
              get: { year },
              set: { binding.wrappedValue = DateWheelMath.update(binding.wrappedValue, year: $0, calendar: calendar) }
            ),
            alignment: .leading
          ) {
            ForEach(fromYear...max(fromYear, toYear), id: \.self) { value in
              WheelPickerItem(verbatim: String(value), value: value)
            }
          }
          .frame(minWidth: 64, alignment: .leading)
          .accessibilityLabel(Text("Year"))
        }
      }
    }
    .environment(\.wheelPickerItemInset, 0)
  }
}
```

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

enum ButtonGroupSpace: Hashable {
  case group
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

private struct ButtonGroupClip: ViewModifier {
  let shape: AnyShape?

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

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

  @Environment(\.buttonGroup) private var group

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

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

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

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

public struct ButtonGroupSeparator: View {
  let orientation: Axis

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

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

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

public struct DateRange: Hashable, Sendable {
  public var from: Date
  public var to: Date?

  public init(from: Date, to: Date? = nil) {
    self.from = from
    self.to = to
  }

  public static func adding(_ day: Date, to range: DateRange?, calendar: Foundation.Calendar) -> DateRange? {
    guard let range else { return DateRange(from: day) }
    let from = range.from
    guard let to = range.to else {
      if calendar.isDate(day, inSameDayAs: from) { return DateRange(from: from, to: day) }
      return day < from ? DateRange(from: day, to: from) : DateRange(from: from, to: day)
    }
    let sameFrom = calendar.isDate(day, inSameDayAs: from)
    let sameTo = calendar.isDate(day, inSameDayAs: to)
    if sameFrom && sameTo { return nil }
    if sameFrom { return DateRange(from: to) }
    if sameTo { return DateRange(from: from) }
    if day < from { return DateRange(from: day, to: to) }
    return DateRange(from: from, to: day)
  }
}

public struct CalendarDayModifiers: Hashable, Sendable {
  public var today = false
  public var selected = false
  public var rangeStart = false
  public var rangeMiddle = false
  public var rangeEnd = false
  public var outside = false
  public var disabled = false

  public init(
    today: Bool = false,
    selected: Bool = false,
    rangeStart: Bool = false,
    rangeMiddle: Bool = false,
    rangeEnd: Bool = false,
    outside: Bool = false,
    disabled: Bool = false
  ) {
    self.today = today
    self.selected = selected
    self.rangeStart = rangeStart
    self.rangeMiddle = rangeMiddle
    self.rangeEnd = rangeEnd
    self.outside = outside
    self.disabled = disabled
  }

  var selectedSingle: Bool { selected && !rangeStart && !rangeEnd && !rangeMiddle }
}

enum CalendarMonthGrid {
  static func startOfMonth(_ date: Date, calendar: Foundation.Calendar) -> Date {
    calendar.date(from: calendar.dateComponents([.year, .month], from: date)) ?? date
  }

  static func weeks(for month: Date, calendar: Foundation.Calendar) -> [[Date]] {
    let first = startOfMonth(month, calendar: calendar)
    let days = calendar.range(of: .day, in: .month, for: first)?.count ?? 30
    let lead = (calendar.component(.weekday, from: first) - calendar.firstWeekday + 7) % 7
    let count = Int((Double(lead + days) / 7).rounded(.up))
    guard let start = calendar.date(byAdding: .day, value: -lead, to: first) else { return [] }
    return (0..<count).map { week in
      (0..<7).compactMap { day in
        calendar.date(byAdding: .day, value: week * 7 + day, to: start)
      }
    }
  }

  static func weekdaySymbols(calendar: Foundation.Calendar, locale: Locale, format: String) -> [String] {
    let formatter = DateFormatter()
    formatter.locale = locale
    formatter.calendar = calendar
    formatter.dateFormat = format
    let reference = weeks(for: Date(timeIntervalSince1970: 0), calendar: calendar).first ?? []
    return reference.map { formatter.string(from: $0) }
  }
}

enum CalendarSelection {
  case single(Binding<Date?>)
  case range(Binding<DateRange?>)
  case multiple(Binding<Set<Date>>)
}

extension EnvironmentValues {
  @Entry var calendarTransparent = false
}

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

    var cell: CGFloat {
      switch self {
      case .sm: 24
      case .default: 32
      case .lg: 40
      }
    }

    var padding: CGFloat {
      switch self {
      case .sm: 8
      case .default: 12
      case .lg: 16
      }
    }

    var caption: TextStyle {
      switch self {
      case .sm: .xs
      case .default: .sm
      case .lg: .base
      }
    }

    var day: TextStyle {
      switch self {
      case .sm: .xs3
      case .default: .sm
      case .lg: .lg
      }
    }

    var weekday: TextStyle {
      self == .lg ? .xs : .xs3
    }
  }

  public enum CaptionLayout: CaseIterable, Sendable {
    case label, dropdown, dropdownMonths, dropdownYears
  }

  let selection: CalendarSelection
  let externalMonth: Binding<Date>?
  let size: Size
  let buttonVariant: VariantButtonStyle.Variant
  let captionLayout: CaptionLayout
  let numberOfMonths: Int
  let showOutsideDays: Bool
  let showWeekNumber: Bool
  let startMonth: Date?
  let endMonth: Date?
  let isDisabled: (Date) -> Bool

  @State private var internalMonth: Date
  @Environment(\.calendar) private var environmentCalendar
  @Environment(\.locale) private var locale
  @Environment(\.calendarTransparent) private var transparent
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  init(
    selection: CalendarSelection,
    initial: Date?,
    month: Binding<Date>?,
    size: Size,
    buttonVariant: VariantButtonStyle.Variant,
    captionLayout: CaptionLayout,
    numberOfMonths: Int,
    showOutsideDays: Bool,
    showWeekNumber: Bool,
    startMonth: Date?,
    endMonth: Date?,
    isDisabled: @escaping (Date) -> Bool
  ) {
    self.selection = selection
    externalMonth = month
    self.size = size
    self.buttonVariant = buttonVariant
    self.captionLayout = captionLayout
    self.numberOfMonths = max(1, numberOfMonths)
    self.showOutsideDays = showOutsideDays
    self.showWeekNumber = showWeekNumber
    self.startMonth = startMonth
    self.endMonth = endMonth
    self.isDisabled = isDisabled
    _internalMonth = State(initialValue: initial ?? Date())
  }

  public init(
    selection: Binding<Date?>,
    month: Binding<Date>? = nil,
    size: Size = .default,
    buttonVariant: VariantButtonStyle.Variant = .plain,
    captionLayout: CaptionLayout = .label,
    numberOfMonths: Int = 1,
    showOutsideDays: Bool = false,
    showWeekNumber: Bool = false,
    startMonth: Date? = nil,
    endMonth: Date? = nil,
    isDisabled: @escaping (Date) -> Bool = { _ in false }
  ) {
    self.init(
      selection: .single(selection),
      initial: selection.wrappedValue,
      month: month,
      size: size,
      buttonVariant: buttonVariant,
      captionLayout: captionLayout,
      numberOfMonths: numberOfMonths,
      showOutsideDays: showOutsideDays,
      showWeekNumber: showWeekNumber,
      startMonth: startMonth,
      endMonth: endMonth,
      isDisabled: isDisabled
    )
  }

  public init(
    selection: Binding<DateRange?>,
    month: Binding<Date>? = nil,
    size: Size = .default,
    buttonVariant: VariantButtonStyle.Variant = .plain,
    captionLayout: CaptionLayout = .label,
    numberOfMonths: Int = 1,
    showOutsideDays: Bool = false,
    showWeekNumber: Bool = false,
    startMonth: Date? = nil,
    endMonth: Date? = nil,
    isDisabled: @escaping (Date) -> Bool = { _ in false }
  ) {
    self.init(
      selection: .range(selection),
      initial: selection.wrappedValue?.from,
      month: month,
      size: size,
      buttonVariant: buttonVariant,
      captionLayout: captionLayout,
      numberOfMonths: numberOfMonths,
      showOutsideDays: showOutsideDays,
      showWeekNumber: showWeekNumber,
      startMonth: startMonth,
      endMonth: endMonth,
      isDisabled: isDisabled
    )
  }

  public init(
    selection: Binding<Set<Date>>,
    month: Binding<Date>? = nil,
    size: Size = .default,
    buttonVariant: VariantButtonStyle.Variant = .plain,
    captionLayout: CaptionLayout = .label,
    numberOfMonths: Int = 1,
    showOutsideDays: Bool = false,
    showWeekNumber: Bool = false,
    startMonth: Date? = nil,
    endMonth: Date? = nil,
    isDisabled: @escaping (Date) -> Bool = { _ in false }
  ) {
    self.init(
      selection: .multiple(selection),
      initial: selection.wrappedValue.min(),
      month: month,
      size: size,
      buttonVariant: buttonVariant,
      captionLayout: captionLayout,
      numberOfMonths: numberOfMonths,
      showOutsideDays: showOutsideDays,
      showWeekNumber: showWeekNumber,
      startMonth: startMonth,
      endMonth: endMonth,
      isDisabled: isDisabled
    )
  }

  private var calendar: Foundation.Calendar {
    var resolved = Foundation.Calendar(identifier: environmentCalendar.identifier)
    resolved.locale = locale
    resolved.timeZone = environmentCalendar.timeZone
    return resolved
  }

  private var displayed: Date {
    CalendarMonthGrid.startOfMonth(externalMonth?.wrappedValue ?? internalMonth, calendar: calendar)
  }

  private func setDisplayed(_ month: Date) {
    let start = CalendarMonthGrid.startOfMonth(month, calendar: calendar)
    if let externalMonth {
      externalMonth.wrappedValue = start
    } else {
      internalMonth = start
    }
  }

  private func shift(_ months: Int) -> Date {
    calendar.date(byAdding: .month, value: months, to: displayed) ?? displayed
  }

  private var canGoBack: Bool {
    guard let startMonth else { return true }
    return displayed > CalendarMonthGrid.startOfMonth(startMonth, calendar: calendar)
  }

  private var canGoForward: Bool {
    guard let endMonth else { return true }
    return shift(numberOfMonths - 1) < CalendarMonthGrid.startOfMonth(endMonth, calendar: calendar)
  }

  private func navigate(_ step: Int) {
    guard step < 0 ? canGoBack : canGoForward else { return }
    if reduceMotion {
      setDisplayed(shift(step))
    } else {
      withAnimation(.timingCurve(0.32, 0.72, 0, 1, duration: 0.3)) { setDisplayed(shift(step)) }
    }
  }

  public var body: some View {
    VStack(alignment: .leading, spacing: 16) {
      ForEach(0..<numberOfMonths, id: \.self) { index in
        month(shift(index), index: index)
      }
    }
    .padding(size.padding)
    .fixedSize()
    .background(transparent ? Color.clear : Color.surface)
    .contentShape(Rectangle())
    .gesture(
      DragGesture(minimumDistance: 24)
        .onEnded { value in
          let dx = value.translation.width
          guard abs(dx) > 48, abs(dx) > abs(value.translation.height) else { return }
          navigate(dx < 0 ? 1 : -1)
        }
    )
  }

  private func month(_ month: Date, index: Int) -> some View {
    let weeks = CalendarMonthGrid.weeks(for: month, calendar: calendar)
    return VStack(alignment: .leading, spacing: 16) {
      HStack(spacing: 2) {
        caption(month)
          .padding(.leading, 6)
          .frame(maxWidth: .infinity, alignment: .leading)
        if index == 0 {
          navButton(icon: Ph.caretLeft.regular, enabled: canGoBack, label: Text("Previous month")) { navigate(-1) }
          navButton(icon: Ph.caretRight.regular, enabled: canGoForward, label: Text("Next month")) { navigate(1) }
        }
      }
      .frame(height: size.cell)
      VStack(spacing: 8) {
        weekdayRow
        ForEach(weeks, id: \.self) { week in
          weekRow(week, month: month)
        }
      }
      .accessibilityElement(children: .contain)
      .accessibilityLabel(Text(verbatim: captionText(month)))
    }
    .frame(width: size.cell * CGFloat(showWeekNumber ? 8 : 7))
  }

  private func captionText(_ month: Date) -> String {
    let formatter = DateFormatter()
    formatter.locale = locale
    formatter.calendar = calendar
    formatter.setLocalizedDateFormatFromTemplate("LLLLy")
    return formatter.string(from: month)
  }

  @ViewBuilder private func caption(_ month: Date) -> some View {
    switch captionLayout {
    case .label:
      Text(verbatim: captionText(month))
        .font(size.caption.font(weight: .semibold))
        .tracking(size.caption.letterSpacing)
        .foregroundStyle(Color.label)
        .lineLimit(1)
    case .dropdown:
      HStack(spacing: 6) {
        monthMenu(month)
        yearMenu(month)
      }
    case .dropdownMonths:
      HStack(spacing: 6) {
        monthMenu(month)
        Text(verbatim: String(calendar.component(.year, from: month)))
          .font(size.caption.font(weight: .semibold))
          .foregroundStyle(Color.label)
      }
    case .dropdownYears:
      HStack(spacing: 6) {
        Text(verbatim: monthSymbol(month, short: false))
          .font(size.caption.font(weight: .semibold))
          .foregroundStyle(Color.label)
        yearMenu(month)
      }
    }
  }

  private func monthSymbol(_ month: Date, short: Bool) -> String {
    let symbols = short ? calendar.shortStandaloneMonthSymbols : calendar.standaloneMonthSymbols
    return symbols[calendar.component(.month, from: month) - 1]
  }

  private var yearBounds: ClosedRange<Int> {
    let current = calendar.component(.year, from: Date())
    let lower = startMonth.map { calendar.component(.year, from: $0) } ?? current - 100
    let upper = endMonth.map { calendar.component(.year, from: $0) } ?? current + 10
    return lower...max(lower, upper)
  }

  private func monthMenu(_ month: Date) -> some View {
    let selected = Binding<Int>(
      get: { calendar.component(.month, from: displayed) },
      set: { value in
        var components = calendar.dateComponents([.year], from: displayed)
        components.month = value
        if let date = calendar.date(from: components) { setDisplayed(date) }
      }
    )
    return Menu {
      Picker(selection: selected) {
        ForEach(1...12, id: \.self) { value in
          Text(verbatim: calendar.standaloneMonthSymbols[value - 1]).tag(value)
        }
      } label: {
        EmptyView()
      }
      .pickerStyle(.inline)
    } label: {
      dropdownLabel(monthSymbol(month, short: true))
    }
  }

  private func yearMenu(_ month: Date) -> some View {
    let selected = Binding<Int>(
      get: { calendar.component(.year, from: displayed) },
      set: { value in
        var components = calendar.dateComponents([.month], from: displayed)
        components.year = value
        if let date = calendar.date(from: components) { setDisplayed(date) }
      }
    )
    return Menu {
      Picker(selection: selected) {
        ForEach(Array(yearBounds), id: \.self) { value in
          Text(verbatim: String(value)).tag(value)
        }
      } label: {
        EmptyView()
      }
      .pickerStyle(.inline)
    } label: {
      dropdownLabel(String(calendar.component(.year, from: month)))
    }
  }

  private func dropdownLabel(_ text: String) -> some View {
    HStack(spacing: 4) {
      Text(verbatim: text)
        .font(size.caption.font(weight: .semibold))
        .tracking(size.caption.letterSpacing)
        .foregroundStyle(Color.label)
      Ph.caretDown.regular
        .frame(width: 14, height: 14)
        .foregroundStyle(Color.labelSecondary)
    }
  }

  private func navButton(icon: some View, enabled: Bool, label: Text, action: @escaping () -> Void) -> some View {
    Button(action: action) {
      icon.frame(width: 16, height: 16)
    }
    .buttonStyle(CalendarNavButtonStyle(variant: buttonVariant, size: size.cell))
    .disabled(!enabled)
    .accessibilityLabel(label)
  }

  private var weekdayRow: some View {
    let symbols = CalendarMonthGrid.weekdaySymbols(calendar: calendar, locale: locale, format: "cccccc")
    return HStack(spacing: 0) {
      if showWeekNumber {
        Color.clear.frame(width: size.cell, height: 1)
      }
      ForEach(Array(symbols.enumerated()), id: \.offset) { _, symbol in
        Text(verbatim: size == .sm ? symbol : symbol.uppercased(with: locale))
          .font(size.weekday.font(weight: .semibold))
          .tracking(size.weekday.letterSpacing)
          .foregroundStyle(Color.labelSecondary)
          .lineLimit(1)
          .frame(maxWidth: .infinity)
      }
    }
    .accessibilityHidden(true)
  }

  private func weekRow(_ week: [Date], month: Date) -> some View {
    HStack(spacing: 0) {
      if showWeekNumber, let first = week.first {
        Text(verbatim: String(calendar.component(.weekOfYear, from: first)))
          .font(TextStyle.xs.font())
          .tracking(TextStyle.xs.letterSpacing)
          .foregroundStyle(Color.labelSecondary)
          .frame(width: size.cell, height: size.cell)
      }
      ForEach(Array(week.enumerated()), id: \.offset) { position, day in
        let modifiers = modifiers(for: day, month: month)
        let hidden = modifiers.outside && !showOutsideDays
        ZStack {
          if !hidden {
            band(modifiers, first: position == 0, last: position == week.count - 1)
            CalendarDayButton(date: day, modifiers: modifiers, size: size) {
              select(day)
            }
          }
        }
        .frame(width: size.cell, height: size.cell)
      }
    }
  }

  @ViewBuilder private func band(_ modifiers: CalendarDayModifiers, first: Bool, last: Bool) -> some View {
    let inBand = modifiers.rangeMiddle || ((modifiers.rangeStart || modifiers.rangeEnd) && !(modifiers.rangeStart && modifiers.rangeEnd))
    if inBand {
      let radius = size.cell / 2
      let leading = modifiers.rangeStart || first ? radius : 0
      let trailing = modifiers.rangeEnd || last ? radius : 0
      UnevenRoundedRectangle(
        topLeadingRadius: leading,
        bottomLeadingRadius: leading,
        bottomTrailingRadius: trailing,
        topTrailingRadius: trailing,
        style: .continuous
      )
      .fill(Color.surfaceSecondary)
    }
  }

  private func modifiers(for day: Date, month: Date) -> CalendarDayModifiers {
    var result = CalendarDayModifiers()
    result.today = calendar.isDateInToday(day)
    result.outside = !calendar.isDate(day, equalTo: month, toGranularity: .month)
    result.disabled = isDisabled(day)
    switch selection {
    case .single(let binding):
      result.selected = binding.wrappedValue.map { calendar.isDate($0, inSameDayAs: day) } ?? false
    case .multiple(let binding):
      result.selected = binding.wrappedValue.contains { calendar.isDate($0, inSameDayAs: day) }
    case .range(let binding):
      guard let range = binding.wrappedValue else { break }
      let start = calendar.isDate(range.from, inSameDayAs: day)
      let end = range.to.map { calendar.isDate($0, inSameDayAs: day) } ?? false
      let middle = range.to.map { day > range.from && day < $0 && !end } ?? false
      result.rangeStart = start
      result.rangeEnd = end || (start && range.to == nil)
      result.rangeMiddle = middle && !start
      result.selected = start || end || result.rangeMiddle
    }
    if result.outside && !showOutsideDays { result.selected = false }
    return result
  }

  private func select(_ day: Date) {
    let normalized = calendar.startOfDay(for: day)
    switch selection {
    case .single(let binding):
      if let current = binding.wrappedValue, calendar.isDate(current, inSameDayAs: normalized) {
        binding.wrappedValue = nil
      } else {
        binding.wrappedValue = normalized
      }
    case .multiple(let binding):
      if let existing = binding.wrappedValue.first(where: { calendar.isDate($0, inSameDayAs: normalized) }) {
        binding.wrappedValue.remove(existing)
      } else {
        binding.wrappedValue.insert(normalized)
      }
    case .range(let binding):
      binding.wrappedValue = DateRange.adding(normalized, to: binding.wrappedValue, calendar: calendar)
    }
    if !calendar.isDate(normalized, equalTo: displayed, toGranularity: .month), numberOfMonths == 1 {
      setDisplayed(normalized)
    }
  }
}

struct CalendarNavButtonStyle: ButtonStyle {
  let variant: VariantButtonStyle.Variant
  let size: CGFloat

  @Environment(\.isEnabled) private var isEnabled

  func makeBody(configuration: Configuration) -> some View {
    let pressed = configuration.isPressed && isEnabled
    configuration.label
      .foregroundStyle(foreground)
      .frame(width: size, height: size)
      .background(background(pressed: pressed), in: Circle())
      .contentShape(Circle())
  }

  private var foreground: Color {
    guard isEnabled else { return .labelQuaternary }
    switch variant {
    case .plain, .tinted, .link: return .link
    case .default: return .onAccent
    case .destructive: return .danger
    case .outline, .secondary, .ghost: return .label
    }
  }

  private func background(pressed: Bool) -> Color {
    switch variant {
    case .default: return pressed ? .accentPressed : .accent
    case .secondary: return pressed ? .controlPressed : .control
    case .tinted: return pressed ? .accentSurfacePressed : .accentSurface
    case .destructive: return pressed ? .dangerSurfacePressed : .dangerSurface
    case .outline, .ghost, .plain: return pressed ? .itemPressed : .clear
    case .link: return .clear
    }
  }
}

public struct CalendarDayButton: View {
  let date: Date
  let modifiers: CalendarDayModifiers
  let size: DateCalendar.Size
  let action: () -> Void

  @Environment(\.locale) private var locale
  @Environment(\.calendar) private var calendar

  public init(date: Date, modifiers: CalendarDayModifiers, size: DateCalendar.Size = .default, action: @escaping () -> Void) {
    self.date = date
    self.modifiers = modifiers
    self.size = size
    self.action = action
  }

  public var body: some View {
    Button(action: action) {
      Text(verbatim: String(calendar.component(.day, from: date)))
    }
    .buttonStyle(PressReader { pressed in
      label(pressed: pressed)
    })
    .disabled(modifiers.disabled)
    .accessibilityLabel(Text(verbatim: accessibilityText))
    .accessibilityAddTraits(modifiers.selected ? .isSelected : [])
  }

  private var accessibilityText: String {
    let formatter = DateFormatter()
    formatter.locale = locale
    formatter.dateStyle = .full
    let full = formatter.string(from: date)
    guard modifiers.today else { return full }
    let relative = RelativeDateTimeFormatter()
    relative.locale = locale
    relative.dateTimeStyle = .named
    let today = relative.localizedString(from: DateComponents(day: 0))
    return "\(today.prefix(1).uppercased())\(today.dropFirst()), \(full)"
  }

  private var accent: Bool {
    modifiers.rangeStart || modifiers.rangeEnd || (modifiers.today && modifiers.selectedSingle)
  }

  private func label(pressed: Bool) -> some View {
    let bold = modifiers.today || modifiers.selectedSingle
    let style = size.day
    let cell = size.cell
    return Text(verbatim: String(calendar.component(.day, from: date)))
      .font(style.font(weight: bold ? .semibold : .regular))
      .tracking(style.letterSpacing)
      .monospacedDigit()
      .foregroundStyle(foreground)
      .frame(width: cell, height: cell)
      .background(background(pressed: pressed && !modifiers.disabled), in: Circle())
      .contentShape(Circle())
  }

  private var foreground: Color {
    if accent { return .onAccent }
    if modifiers.disabled { return .labelQuaternary }
    if modifiers.rangeMiddle { return .label }
    if modifiers.selectedSingle || modifiers.today { return .link }
    if modifiers.outside { return .labelSecondary }
    return .label
  }

  private func background(pressed: Bool) -> Color {
    if accent { return pressed ? .accentPressed : .accent }
    if modifiers.rangeMiddle { return pressed ? .itemPressed : .clear }
    if modifiers.selectedSingle { return pressed ? .accentSurfacePressed : .accentSurface }
    return pressed ? .itemPressed : .clear
  }
}
```

```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/Dialog.swift"
import SwiftUI

extension View {
  public func dialog<Content: View>(
    isPresented: Binding<Bool>,
    @ViewBuilder content: @escaping () -> Content
  ) -> some View {
    modifier(
      CoverPresenter(isPresented: isPresented) { visible in
        CenteredStage(visible: visible, dismissible: true, content: content)
      }
    )
  }
}

struct CenteredStage<Content: View>: View {
  let visible: Bool
  let dismissible: Bool
  @ViewBuilder let content: () -> Content

  @Environment(\.overlayDismiss) private var dismiss
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  var body: some View {
    ZStack {
      ScrimLayer(visible: visible, dismissible: dismissible)
      content()
        .scaleEffect(visible || reduceMotion ? 1 : 0.95)
        .opacity(visible ? 1 : 0)
        .padding(16)
    }
    .accessibilityAction(.escape) { dismiss?() }
  }
}

extension EnvironmentValues {
  @Entry var overlayCloseInset: CGFloat = 0
}

public struct DialogContent<Content: View>: View {
  let showCloseButton: Bool
  let closeLabel: LocalizedStringKey?
  let content: Content

  public init(
    showCloseButton: Bool = true,
    closeLabel: LocalizedStringKey? = nil,
    @ViewBuilder content: () -> Content
  ) {
    self.showCloseButton = showCloseButton
    self.closeLabel = closeLabel
    self.content = content()
  }

  public var body: some View {
    VStack(alignment: .leading, spacing: 24) {
      content
    }
    .padding(24)
    .frame(maxWidth: 448, alignment: .leading)
    .environment(\.overlayCloseInset, showCloseButton ? (closeLabel == nil ? 32 : 72) : 0)
    .popupSurface(radius: Radius.xl2)
    .overlay(alignment: .topTrailing) {
      if showCloseButton {
        OverlayCloseButton(label: closeLabel)
          .padding(.top, closeLabel == nil ? 19 : 17)
          .padding(.trailing, 16)
      }
    }
    .accessibilityElement(children: .contain)
    .accessibilityAddTraits(.isModal)
  }
}

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

  @Environment(\.overlayCloseInset) private var closeInset

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

  public var body: some View {
    VStack(alignment: .leading, spacing: 6) {
      content
    }
    .padding(.trailing, closeInset)
    .frame(maxWidth: .infinity, alignment: .leading)
  }
}

public struct DialogFooter<Content: View>: View {
  let showCloseButton: Bool
  let content: Content

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

  public var body: some View {
    ReversedVStack(spacing: 8) {
      content
      if showCloseButton {
        DialogClose {
          Text("Close").frame(maxWidth: .infinity)
        }
        .buttonStyle(.variant(.secondary))
      }
    }
  }
}

extension DialogFooter where Content == EmptyView {
  public init(showCloseButton: Bool) {
    self.init(showCloseButton: showCloseButton) { EmptyView() }
  }
}

public struct DialogTitle: View {
  let text: Text

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

  public init(verbatim title: String) {
    text = Text(verbatim: title)
  }

  public var body: some View {
    text
      .textStyle(.base, weight: .semibold)
      .foregroundStyle(Color.label)
      .fixedSize(horizontal: false, vertical: true)
      .accessibilityAddTraits(.isHeader)
  }
}

public struct DialogDescription: View {
  let text: Text

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

  public init(verbatim description: String) {
    text = Text(verbatim: description)
  }

  public var body: some View {
    text
      .textStyle(.sm)
      .foregroundStyle(Color.labelSecondary)
      .fixedSize(horizontal: false, vertical: true)
  }
}

public struct DialogClose<Label: View>: View {
  let action: (() -> Void)?
  let label: Label

  @Environment(\.overlayDismiss) private var dismiss

  public init(action: (() -> Void)? = nil, @ViewBuilder label: () -> Label) {
    self.action = action
    self.label = label()
  }

  public var body: some View {
    Button {
      action?()
      dismiss?()
    } label: {
      label
    }
  }
}

extension DialogClose where Label == Text {
  public init(_ title: LocalizedStringKey, action: (() -> Void)? = nil) {
    self.init(action: action) { Text(title) }
  }
}
```

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

extension View {
  public func drawer<Content: View>(
    isPresented: Binding<Bool>,
    detents: Set<PresentationDetent>? = nil,
    selection: Binding<PresentationDetent>? = nil,
    onDismiss: (() -> Void)? = nil,
    @ViewBuilder content: @escaping () -> Content
  ) -> some View {
    let binding = isPresented
    return sheet(isPresented: isPresented, onDismiss: onDismiss) {
      DrawerHost(detents: detents, selection: selection, content: content)
        .environment(\.overlayDismiss, OverlayDismiss { binding.wrappedValue = false })
    }
  }
}

extension EnvironmentValues {
  @Entry var drawerFitsContent = false
}

struct DrawerHost<Content: View>: View {
  let detents: Set<PresentationDetent>?
  let selection: Binding<PresentationDetent>?
  @ViewBuilder let content: () -> Content

  @State private var height: CGFloat = 0
  @State private var bottomInset: CGFloat = 0

  var body: some View {
    let styled = content()
      .environment(\.drawerFitsContent, detents == nil)
      .frame(maxWidth: .infinity, maxHeight: detents == nil ? nil : .infinity, alignment: .top)
      .onGeometryChange(for: CGFloat.self) { proxy in
        proxy.size.height
      } action: { value in
        height = value
      }
      .background {
        GeometryReader { proxy in
          Color.clear.onAppear { bottomInset = proxy.safeAreaInsets.bottom }
        }
      }
      .presentationDragIndicator(.visible)
      .presentationBackground(Color.surfaceRaised)
      .presentationCornerRadius(Radius.xl3)
    if let detents, let selection {
      styled.presentationDetents(detents, selection: selection)
    } else if let detents {
      styled.presentationDetents(detents)
    } else {
      styled.presentationDetents([.height(max(height + bottomInset, 1))])
    }
  }
}

public struct DrawerContent<Content: View>: View {
  let showCloseButton: Bool
  let closeLabel: LocalizedStringKey?
  let content: Content

  @Environment(\.drawerFitsContent) private var fitsContent

  public init(
    showCloseButton: Bool = false,
    closeLabel: LocalizedStringKey? = nil,
    @ViewBuilder content: () -> Content
  ) {
    self.showCloseButton = showCloseButton
    self.closeLabel = closeLabel
    self.content = content()
  }

  public var body: some View {
    VStack(alignment: .leading, spacing: 0) {
      content
    }
    .padding(.top, 12)
    .frame(maxWidth: .infinity, maxHeight: fitsContent ? nil : .infinity, alignment: .top)
    .fixedSize(horizontal: false, vertical: fitsContent)
    .environment(\.overlayCloseInset, showCloseButton ? (closeLabel == nil ? 56 : 96) : 0)
    .overlay(alignment: .topTrailing) {
      if showCloseButton {
        OverlayCloseButton(label: closeLabel)
          .padding(.top, closeLabel == nil ? 23 : 21)
          .padding(.trailing, 16)
      }
    }
    .background(Color.surfaceRaised)
  }
}

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

  @Environment(\.overlayCloseInset) private var closeInset

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

  public var body: some View {
    VStack(spacing: 2) {
      content
    }
    .multilineTextAlignment(.center)
    .frame(maxWidth: .infinity)
    .padding(.top, 16)
    .padding(.horizontal, max(closeInset, 16))
  }
}

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

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

  public var body: some View {
    VStack(spacing: 0) {
      Spacer(minLength: 0)
      VStack(spacing: 8) {
        content
      }
      .frame(maxWidth: .infinity)
      .padding([.horizontal, .bottom], 16)
    }
  }
}

public typealias DrawerTitle = DialogTitle
public typealias DrawerDescription = DialogDescription
public typealias DrawerClose<Label: View> = DialogClose<Label>
```

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

enum MenuPresentation: Sendable {
  case system, popup
}

extension EnvironmentValues {
  @Entry var menuPresentation: MenuPresentation = .system
  @Entry var menuRadio = MenuRadioContext()
}

struct MenuRadioContext: @unchecked Sendable {
  var selected: AnyHashable?
  var select: @MainActor @Sendable (AnyHashable) -> Void = { _ in }
}

public struct DropdownMenu<Label: View, Content: View>: View {
  let side: Edge
  let align: PopupAlignment
  let sideOffset: CGFloat
  let alignOffset: CGFloat
  let external: Binding<Bool>?
  let content: () -> Content
  let label: Label

  @State private var local = false

  public init(
    isPresented: Binding<Bool>? = nil,
    side: Edge = .bottom,
    align: PopupAlignment = .start,
    sideOffset: CGFloat = 4,
    alignOffset: CGFloat = 0,
    @ViewBuilder content: @escaping () -> Content,
    @ViewBuilder label: () -> Label
  ) {
    self.external = isPresented
    self.side = side
    self.align = align
    self.sideOffset = sideOffset
    self.alignOffset = alignOffset
    self.content = content
    self.label = label()
  }

  public var body: some View {
    let binding = external ?? $local
    Button {
      binding.wrappedValue = true
    } label: {
      label
    }
    .accessibilityHint(Text("Opens a menu"))
    .anchoredPopup(
      isPresented: binding,
      side: side,
      align: align,
      sideOffset: sideOffset,
      alignOffset: alignOffset,
      minWidth: 192
    ) {
      MenuPanel(content: content)
    }
  }
}

extension DropdownMenu where Label == Text {
  public init(
    _ title: LocalizedStringKey,
    isPresented: Binding<Bool>? = nil,
    side: Edge = .bottom,
    align: PopupAlignment = .start,
    @ViewBuilder content: @escaping () -> Content
  ) {
    self.init(isPresented: isPresented, side: side, align: align, content: content) { Text(title) }
  }
}

struct MenuPanel<Content: View>: View {
  @ViewBuilder let content: () -> Content

  var body: some View {
    let stack = VStack(alignment: .leading, spacing: 0) {
      content()
    }
    .padding(6)
    ViewThatFits(in: .vertical) {
      stack
      ScrollView { stack }
    }
    .font(TextStyle.base.font())
    .tracking(TextStyle.base.letterSpacing)
    .foregroundStyle(Color.label)
    .environment(\.menuPresentation, .popup)
    .popupSurface(radius: Radius.xl)
    .accessibilityElement(children: .contain)
  }
}

struct MenuRowStyle: ButtonStyle {
  var destructive = false
  var inset = false
  var trailing: CGFloat = 12
  var selected = false

  @Environment(\.isEnabled) private var isEnabled

  func makeBody(configuration: Configuration) -> some View {
    configuration.label
      .labelStyle(ButtonLabelStyle(spacing: 10, iconSize: 16))
      .lineLimit(1)
      .foregroundStyle(!isEnabled ? Color.labelQuaternary : destructive ? .danger : .label)
      .padding(.leading, inset ? 38 : 12)
      .padding(.trailing, trailing)
      .padding(.vertical, 8)
      .frame(maxWidth: .infinity, alignment: .leading)
      .background(background(pressed: configuration.isPressed), in: RoundedRectangle(cornerRadius: Radius.md, style: .continuous))
      .contentShape(Rectangle())
  }

  private func background(pressed: Bool) -> Color {
    if pressed && isEnabled {
      return destructive ? .dangerSurfacePressed : .itemPressed
    }
    return selected ? .itemSelected : .clear
  }
}

private struct MenuCheckmark: View {
  let visible: Bool

  var body: some View {
    Ph.check.regular
      .frame(width: 16, height: 16)
      .opacity(visible ? 1 : 0)
      .padding(.trailing, 8)
      .accessibilityHidden(true)
  }
}

public struct DropdownMenuItem<Label: View>: View {
  public enum Variant: CaseIterable, Sendable {
    case `default`, destructive
  }

  let variant: Variant
  let inset: Bool
  let action: () -> Void
  let label: Label

  @Environment(\.menuPresentation) private var presentation
  @Environment(\.overlayDismiss) private var dismiss

  public init(
    variant: Variant = .default,
    inset: Bool = false,
    action: @escaping () -> Void,
    @ViewBuilder label: () -> Label
  ) {
    self.variant = variant
    self.inset = inset
    self.action = action
    self.label = label()
  }

  public var body: some View {
    if presentation == .system {
      Button(role: variant == .destructive ? .destructive : nil, action: action) {
        label
      }
    } else {
      Button {
        action()
        dismiss?()
      } label: {
        HStack(spacing: 10) {
          label
        }
      }
      .buttonStyle(MenuRowStyle(destructive: variant == .destructive, inset: inset))
    }
  }
}

extension DropdownMenuItem where Label == Text {
  public init(
    _ title: LocalizedStringKey,
    variant: Variant = .default,
    inset: Bool = false,
    action: @escaping () -> Void
  ) {
    self.init(variant: variant, inset: inset, action: action) { Text(title) }
  }
}

extension DropdownMenuItem where Label == SwiftUI.Label<Text, Image> {
  public init(
    _ title: LocalizedStringKey,
    icon: Image,
    variant: Variant = .default,
    action: @escaping () -> Void
  ) {
    self.init(variant: variant, action: action) {
      SwiftUI.Label { Text(title) } icon: { icon }
    }
  }
}

public struct DropdownMenuCheckboxItem<Label: View>: View {
  let isOn: Binding<Bool>
  let inset: Bool
  let label: Label

  @Environment(\.menuPresentation) private var presentation

  public init(isOn: Binding<Bool>, inset: Bool = false, @ViewBuilder label: () -> Label) {
    self.isOn = isOn
    self.inset = inset
    self.label = label()
  }

  public var body: some View {
    if presentation == .system {
      Toggle(isOn: isOn) { label }
    } else {
      Button {
        isOn.wrappedValue.toggle()
      } label: {
        label
      }
      .buttonStyle(MenuRowStyle(inset: inset, trailing: 32))
      .overlay(alignment: .trailing) { MenuCheckmark(visible: isOn.wrappedValue) }
      .accessibilityAddTraits(isOn.wrappedValue ? [.isToggle, .isSelected] : .isToggle)
    }
  }
}

extension DropdownMenuCheckboxItem where Label == Text {
  public init(_ title: LocalizedStringKey, isOn: Binding<Bool>, inset: Bool = false) {
    self.init(isOn: isOn, inset: inset) { Text(title) }
  }
}

public struct DropdownMenuRadioGroup<Content: View>: View {
  let selection: Binding<AnyHashable>
  let content: Content

  public init<Value: Hashable & Sendable>(selection: Binding<Value>, @ViewBuilder content: () -> Content) {
    self.selection = Binding(
      get: { AnyHashable(selection.wrappedValue) },
      set: { value in
        if let value = value.base as? Value { selection.wrappedValue = value }
      }
    )
    self.content = content()
  }

  public var body: some View {
    let binding = selection
    content
      .environment(
        \.menuRadio,
        MenuRadioContext(selected: binding.wrappedValue, select: { binding.wrappedValue = $0 })
      )
  }
}

public struct DropdownMenuRadioItem<Label: View>: View {
  let value: AnyHashable
  let inset: Bool
  let label: Label

  @Environment(\.menuPresentation) private var presentation
  @Environment(\.menuRadio) private var radio

  public init<Value: Hashable & Sendable>(value: Value, inset: Bool = false, @ViewBuilder label: () -> Label) {
    self.value = AnyHashable(value)
    self.inset = inset
    self.label = label()
  }

  public var body: some View {
    let selected = radio.selected == value
    if presentation == .system {
      let radio = radio
      let value = value
      Toggle(isOn: Binding(get: { selected }, set: { if $0 { radio.select(value) } })) { label }
    } else {
      Button {
        radio.select(value)
      } label: {
        label
      }
      .buttonStyle(MenuRowStyle(inset: inset, trailing: 32))
      .overlay(alignment: .trailing) { MenuCheckmark(visible: selected) }
      .accessibilityAddTraits(selected ? .isSelected : [])
    }
  }
}

extension DropdownMenuRadioItem where Label == Text {
  public init<Value: Hashable & Sendable>(_ title: LocalizedStringKey, value: Value, inset: Bool = false) {
    self.init(value: value, inset: inset) { Text(title) }
  }
}

public struct DropdownMenuLabel: View {
  let title: LocalizedStringKey
  let inset: Bool

  @Environment(\.menuPresentation) private var presentation

  public init(_ title: LocalizedStringKey, inset: Bool = false) {
    self.title = title
    self.inset = inset
  }

  public var body: some View {
    if presentation == .system {
      Text(title)
    } else {
      Text(title)
        .font(TextStyle.xs.font(weight: .semibold))
        .tracking(TextStyle.xs.letterSpacing)
        .foregroundStyle(Color.labelSecondary)
        .padding(.leading, inset ? 38 : 12)
        .padding(.trailing, 12)
        .padding(.vertical, 10)
        .frame(maxWidth: .infinity, alignment: .leading)
        .accessibilityAddTraits(.isHeader)
    }
  }
}

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

  @Environment(\.menuPresentation) private var presentation

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

  public var body: some View {
    if presentation == .system {
      Section { content }
    } else {
      VStack(alignment: .leading, spacing: 0) { content }
    }
  }
}

public struct DropdownMenuSeparator: View {
  @Environment(\.menuPresentation) private var presentation

  public init() {}

  public var body: some View {
    if presentation == .system {
      Divider()
    } else {
      Rectangle()
        .fill(Color.separator.opacity(0.5))
        .frame(height: 1)
        .padding(.vertical, 6)
        .padding(.horizontal, -6)
        .accessibilityHidden(true)
    }
  }
}

public struct DropdownMenuSub<Label: View, Content: View>: View {
  let inset: Bool
  let content: Content
  let label: Label

  @State private var open = false
  @Environment(\.menuPresentation) private var presentation
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  public init(inset: Bool = false, @ViewBuilder content: () -> Content, @ViewBuilder label: () -> Label) {
    self.inset = inset
    self.content = content()
    self.label = label()
  }

  public var body: some View {
    if presentation == .system {
      Menu { content } label: { label }
    } else {
      VStack(alignment: .leading, spacing: 0) {
        Button {
          withAnimation(reduceMotion ? nil : .easeInOut(duration: 0.2)) { open.toggle() }
        } label: {
          HStack(spacing: 8) {
            label
            Spacer(minLength: 16)
            Ph.caretRight.regular
              .frame(width: 16, height: 16)
              .rotationEffect(.degrees(open ? 90 : 0))
          }
        }
        .buttonStyle(MenuRowStyle(inset: inset, selected: open))
        .accessibilityValue(Text(open ? "Expanded" : "Collapsed"))
        if open {
          VStack(alignment: .leading, spacing: 0) { content }
            .padding(.leading, 12)
            .transition(.opacity)
        }
      }
    }
  }
}

extension DropdownMenuSub where Label == Text {
  public init(_ title: LocalizedStringKey, inset: Bool = false, @ViewBuilder content: () -> Content) {
    self.init(inset: inset, content: content) { Text(title) }
  }
}

extension DropdownMenuSub where Label == SwiftUI.Label<Text, Image> {
  public init(_ title: LocalizedStringKey, icon: Image, @ViewBuilder content: () -> Content) {
    self.init(content: content) {
      SwiftUI.Label { Text(title) } icon: { icon }
    }
  }
}
```

```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/Overlay.swift"
import PhosphorSwift
import Observation
import SwiftUI

public enum PopupAlignment: Sendable, CaseIterable {
  case start, center, end
}

struct OverlayDismiss: Sendable {
  let action: @MainActor @Sendable () -> Void

  @MainActor func callAsFunction() {
    action()
  }
}

extension EnvironmentValues {
  @Entry var overlayDismiss: OverlayDismiss? = nil
}

private var instantTransaction: Transaction {
  var transaction = Transaction()
  transaction.disablesAnimations = true
  return transaction
}

struct CoverPresenter<Cover: View>: ViewModifier {
  @Binding var isPresented: Bool
  var enter: Animation = .easeOut(duration: 0.15)
  var exit: Animation = .easeIn(duration: 0.1)
  @ViewBuilder let cover: (Bool) -> Cover

  @State private var presented = false
  @State private var visible = false

  func body(content: Content) -> some View {
    let binding = $isPresented
    content
      .fullScreenCover(isPresented: coverBinding) {
        cover(visible)
          .environment(\.overlayDismiss, OverlayDismiss { binding.wrappedValue = false })
          .presentationBackground(.clear)
          .onAppear {
            withAnimation(enter) { visible = true }
          }
      }
      .onChange(of: isPresented, initial: true) { _, value in
        if value {
          withTransaction(instantTransaction) { presented = true }
        } else if presented {
          withAnimation(exit) {
            visible = false
          } completion: {
            withTransaction(instantTransaction) { presented = false }
          }
        }
      }
  }

  private var coverBinding: Binding<Bool> {
    Binding(
      get: { presented },
      set: { value in
        presented = value
        if !value {
          visible = false
          isPresented = false
        }
      }
    )
  }
}

struct PopupLayout: Layout {
  var anchor: CGRect
  var side: Edge
  var align: PopupAlignment
  var sideOffset: CGFloat
  var alignOffset: CGFloat
  var matchWidth: Bool
  var minWidth: CGFloat
  var maxHeight: CGFloat
  var margin: CGFloat = 8

  func sizeThatFits(proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) -> CGSize {
    proposal.replacingUnspecifiedDimensions()
  }

  func placeSubviews(in bounds: CGRect, proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) {
    guard let view = subviews.first else { return }
    let anchor = anchor.offsetBy(dx: bounds.minX, dy: bounds.minY)
    let maxWidth = max(0, bounds.width - margin * 2)
    var width: CGFloat
    if matchWidth {
      width = max(anchor.width, minWidth)
    } else {
      width = max(view.sizeThatFits(ProposedViewSize(width: nil, height: nil)).width, minWidth)
    }
    width = min(width, maxWidth)
    let natural = view.sizeThatFits(ProposedViewSize(width: width, height: nil))
    let vertical = side == .top || side == .bottom
    let before = vertical
      ? anchor.minY - sideOffset - bounds.minY - margin
      : anchor.minX - sideOffset - bounds.minX - margin
    let after = vertical
      ? bounds.maxY - margin - anchor.maxY - sideOffset
      : bounds.maxX - margin - anchor.maxX - sideOffset
    let extent = vertical ? natural.height : natural.width
    var resolved = side
    switch side {
    case .bottom where extent > after && before > after: resolved = .top
    case .top where extent > before && after > before: resolved = .bottom
    case .trailing where extent > after && before > after: resolved = .leading
    case .leading where extent > before && after > before: resolved = .trailing
    default: break
    }
    var height = natural.height
    let space: CGFloat
    switch resolved {
    case .top, .leading: space = before
    case .bottom, .trailing: space = after
    }
    if vertical {
      height = min(height, maxHeight, max(space, 0))
    } else {
      height = min(height, maxHeight, bounds.height - margin * 2)
      width = min(width, max(space, 0))
    }
    var x: CGFloat
    var y: CGFloat
    if vertical {
      switch align {
      case .start: x = anchor.minX + alignOffset
      case .center: x = anchor.midX - width / 2 + alignOffset
      case .end: x = anchor.maxX - width - alignOffset
      }
      y = resolved == .bottom ? anchor.maxY + sideOffset : anchor.minY - sideOffset - height
    } else {
      switch align {
      case .start: y = anchor.minY + alignOffset
      case .center: y = anchor.midY - height / 2 + alignOffset
      case .end: y = anchor.maxY - height - alignOffset
      }
      x = resolved == .trailing ? anchor.maxX + sideOffset : anchor.minX - sideOffset - width
    }
    x = min(max(x, bounds.minX + margin), bounds.maxX - margin - width)
    y = min(max(y, bounds.minY + margin), bounds.maxY - margin - height)
    view.place(
      at: CGPoint(x: x, y: y),
      anchor: .topLeading,
      proposal: ProposedViewSize(width: width, height: height)
    )
  }
}

struct PopupPresenter<Popup: View>: ViewModifier {
  @Binding var isPresented: Bool
  var side: Edge = .bottom
  var align: PopupAlignment = .start
  var sideOffset: CGFloat = 4
  var alignOffset: CGFloat = 0
  var matchWidth = false
  var minWidth: CGFloat = 0
  var maxHeight: CGFloat = .infinity
  @ViewBuilder let popup: () -> Popup

  @State private var anchor = PopupAnchor()

  func body(content: Content) -> some View {
    content
      .onGeometryChange(for: CGRect.self) { proxy in
        proxy.frame(in: .global)
      } action: { frame in
        anchor.frame = frame
      }
      .modifier(
        CoverPresenter(isPresented: $isPresented) { visible in
          PopupCanvas(
            anchor: anchor,
            side: side,
            align: align,
            sideOffset: sideOffset,
            alignOffset: alignOffset,
            matchWidth: matchWidth,
            minWidth: minWidth,
            maxHeight: maxHeight,
            visible: visible,
            popup: popup
          )
        }
      )
  }
}

@Observable
final class PopupAnchor {
  var frame: CGRect = .zero
}

struct PopupCanvas<Popup: View>: View {
  let anchor: PopupAnchor
  let side: Edge
  let align: PopupAlignment
  let sideOffset: CGFloat
  let alignOffset: CGFloat
  let matchWidth: Bool
  let minWidth: CGFloat
  let maxHeight: CGFloat
  let visible: Bool
  @ViewBuilder let popup: () -> Popup

  @Environment(\.overlayDismiss) private var dismiss
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  var body: some View {
    GeometryReader { proxy in
      let origin = proxy.frame(in: .global).origin
      PopupLayout(
        anchor: anchor.frame.offsetBy(dx: -origin.x, dy: -origin.y),
        side: side,
        align: align,
        sideOffset: sideOffset,
        alignOffset: alignOffset,
        matchWidth: matchWidth,
        minWidth: minWidth,
        maxHeight: maxHeight
      ) {
        popup()
          .accessibilityAddTraits(.isModal)
          .scaleEffect(visible || reduceMotion ? 1 : 0.96, anchor: scaleAnchor)
          .opacity(visible ? 1 : 0)
      }
    }
    .background {
      Color.clear
        .contentShape(Rectangle())
        .ignoresSafeArea()
        .onTapGesture { dismiss?() }
        .accessibilityHidden(true)
    }
    .accessibilityAction(.escape) { dismiss?() }
  }

  private var scaleAnchor: UnitPoint {
    switch side {
    case .top: .bottom
    case .bottom: .top
    case .leading: .trailing
    case .trailing: .leading
    }
  }
}

extension View {
  func anchoredPopup<Popup: View>(
    isPresented: Binding<Bool>,
    side: Edge = .bottom,
    align: PopupAlignment = .start,
    sideOffset: CGFloat = 4,
    alignOffset: CGFloat = 0,
    matchWidth: Bool = false,
    minWidth: CGFloat = 0,
    maxHeight: CGFloat = .infinity,
    @ViewBuilder popup: @escaping () -> Popup
  ) -> some View {
    modifier(
      PopupPresenter(
        isPresented: isPresented,
        side: side,
        align: align,
        sideOffset: sideOffset,
        alignOffset: alignOffset,
        matchWidth: matchWidth,
        minWidth: minWidth,
        maxHeight: maxHeight,
        popup: popup
      )
    )
  }

  func popupSurface(radius: CGFloat = Radius.xl, shadow: Shadow = .lg) -> some View {
    modifier(PopupSurface(radius: radius, shadow: shadow))
  }
}

struct PopupSurface: ViewModifier {
  let radius: CGFloat
  let shadow: Shadow

  @Environment(\.colorScheme) private var colorScheme

  func body(content: Content) -> some View {
    let shape = RoundedRectangle(cornerRadius: radius, style: .continuous)
    content
      .clipShape(shape)
      .background {
        shape
          .fill(Color.surfaceRaised)
          .shadow(shadow)
      }
      .overlay {
        shape.strokeBorder(Color.label.opacity(colorScheme == .dark ? 0.1 : 0.05))
      }
  }
}

struct OverlayCloseButton: View {
  let label: LocalizedStringKey?

  @Environment(\.overlayDismiss) private var dismiss

  var body: some View {
    if let label {
      Button {
        dismiss?()
      } label: {
        Text(label).font(TextStyle.base.font())
      }
      .buttonStyle(.variant(.plain, size: .sm))
    } else {
      Button {
        dismiss?()
      } label: {
        Ph.x.regular
          .frame(width: 16, height: 16)
          .foregroundStyle(Color.label)
      }
      .buttonStyle(CloseIconButtonStyle())
      .accessibilityLabel(Text("Close"))
    }
  }
}

private struct CloseIconButtonStyle: ButtonStyle {
  func makeBody(configuration: Configuration) -> some View {
    configuration.label
      .frame(width: 32, height: 32)
      .background(configuration.isPressed ? Color.separator : .surfaceTertiary, in: Circle())
      .contentShape(Circle().inset(by: -8))
  }
}

struct ReversedVStack: Layout {
  var spacing: CGFloat

  func sizeThatFits(proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) -> CGSize {
    let width = proposal.width
    var height: CGFloat = 0
    var widest: CGFloat = 0
    for view in subviews {
      let size = view.sizeThatFits(ProposedViewSize(width: width, height: nil))
      height += size.height
      widest = max(widest, size.width)
    }
    height += spacing * CGFloat(max(subviews.count - 1, 0))
    return CGSize(width: width ?? widest, height: height)
  }

  func placeSubviews(in bounds: CGRect, proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) {
    var y = bounds.minY
    for view in subviews.reversed() {
      let size = view.sizeThatFits(ProposedViewSize(width: bounds.width, height: nil))
      view.place(
        at: CGPoint(x: bounds.minX, y: y),
        anchor: .topLeading,
        proposal: ProposedViewSize(width: bounds.width, height: size.height)
      )
      y += size.height + spacing
    }
  }
}

struct ScrimLayer: View {
  let visible: Bool
  var dismissible = true

  @Environment(\.overlayDismiss) private var dismiss

  var body: some View {
    Color.scrim
      .ignoresSafeArea()
      .opacity(visible ? 1 : 0)
      .contentShape(Rectangle())
      .onTapGesture {
        if dismissible { dismiss?() }
      }
      .accessibilityHidden(true)
  }
}
```

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

struct SelectContext: @unchecked Sendable {
  var selected: AnyHashable?
  var registering = false
  var select: @MainActor @Sendable (AnyHashable) -> Void = { _ in }
}

extension EnvironmentValues {
  @Entry var select = SelectContext()
}

struct SelectLabelsKey: PreferenceKey {
  static var defaultValue: [AnyHashable: Text] { [:] }

  static func reduce(value: inout [AnyHashable: Text], nextValue: () -> [AnyHashable: Text]) {
    value.merge(nextValue()) { current, _ in current }
  }
}

public enum SelectSize: CaseIterable, Sendable {
  case `default`, sm
}

public struct SelectField<Value: Hashable & Sendable, Content: View>: View {
  public typealias Size = SelectSize

  let selection: Binding<Value?>
  let placeholder: LocalizedStringKey
  let size: Size
  let content: () -> Content

  @State private var open = false
  @State private var labels: [AnyHashable: Text] = [:]
  @Environment(\.isEnabled) private var isEnabled
  @Environment(\.isInvalid) private var invalid
  @Environment(\.colorScheme) private var colorScheme

  public init(
    selection: Binding<Value?>,
    placeholder: LocalizedStringKey = "Select",
    size: Size = .default,
    @ViewBuilder content: @escaping () -> Content
  ) {
    self.selection = selection
    self.placeholder = placeholder
    self.size = size
    self.content = content
  }

  public var body: some View {
    let binding = selection
    let current = binding.wrappedValue.map { AnyHashable($0) }
    let valueText = current.flatMap { labels[$0] }
    let context = SelectContext(
      selected: current,
      select: { value in
        if let value = value.base as? Value { binding.wrappedValue = value }
      }
    )
    ButtonGroupItem(radius: size == .sm ? Radius.md : Radius.lg) { shape in
      Button {
        open = true
      } label: {
        HStack(spacing: 6) {
          (valueText ?? Text(placeholder))
            .font(TextStyle.base.font())
            .tracking(TextStyle.base.letterSpacing)
            .lineLimit(1)
            .foregroundStyle(!isEnabled ? Color.labelQuaternary : valueText == nil ? .labelSecondary : .label)
            .frame(maxWidth: .infinity, alignment: .leading)
          Ph.caretUpDown.regular
            .frame(width: 16, height: 16)
            .foregroundStyle(Color.labelSecondary)
            .accessibilityHidden(true)
        }
        .padding(.horizontal, 12)
        .frame(height: size == .sm ? 36 : 44)
        .background(background, in: shape)
        .overlay {
          if invalid {
            shape.strokeBorder(Color.danger)
          }
        }
        .contentShape(shape)
      }
      .buttonStyle(SelectTriggerStyle())
    }
    .accessibilityHint(Text("Shows options"))
    .background {
      VStack(spacing: 0) { content() }
        .environment(\.select, SelectContext(registering: true))
        .hidden()
        .frame(width: 0, height: 0)
        .clipped()
        .accessibilityHidden(true)
        .allowsHitTesting(false)
    }
    .onPreferenceChange(SelectLabelsKey.self) { value in
      labels = value
    }
    .anchoredPopup(
      isPresented: $open,
      side: .bottom,
      align: .center,
      matchWidth: true,
      minWidth: 144
    ) {
      SelectPanel(content: content)
        .environment(\.select, context)
    }
  }

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

private struct SelectTriggerStyle: ButtonStyle {
  func makeBody(configuration: Configuration) -> some View {
    configuration.label.opacity(configuration.isPressed ? 0.8 : 1)
  }
}

struct SelectPanel<Content: View>: View {
  @ViewBuilder let content: () -> Content

  var body: some View {
    let stack = VStack(alignment: .leading, spacing: 0) {
      content()
    }
    .padding(6)
    ViewThatFits(in: .vertical) {
      stack
      ScrollView { stack }
    }
    .font(TextStyle.base.font())
    .tracking(TextStyle.base.letterSpacing)
    .foregroundStyle(Color.label)
    .popupSurface(radius: Radius.xl)
    .accessibilityElement(children: .contain)
  }
}

public struct SelectItem: View {
  let value: AnyHashable
  let title: Text

  @Environment(\.select) private var select
  @Environment(\.overlayDismiss) private var dismiss

  public init<Value: Hashable & Sendable>(_ title: LocalizedStringKey, value: Value) {
    self.value = AnyHashable(value)
    self.title = Text(title)
  }

  public init<Value: Hashable & Sendable>(verbatim title: String, value: Value) {
    self.value = AnyHashable(value)
    self.title = Text(verbatim: title)
  }

  public var body: some View {
    if select.registering {
      Color.clear
        .frame(width: 0, height: 0)
        .preference(key: SelectLabelsKey.self, value: [value: title])
    } else {
      let selected = select.selected == value
      Button {
        select.select(value)
        dismiss?()
      } label: {
        title
      }
      .buttonStyle(MenuRowStyle(trailing: 32))
      .overlay(alignment: .trailing) {
        if selected {
          Ph.check.regular
            .frame(width: 16, height: 16)
            .foregroundStyle(Color.link)
            .padding(.trailing, 8)
            .accessibilityHidden(true)
        }
      }
      .accessibilityAddTraits(selected ? .isSelected : [])
    }
  }
}

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

  @Environment(\.select) private var select

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

  public var body: some View {
    VStack(alignment: .leading, spacing: 0) { content }
  }
}

public struct SelectLabel: View {
  let title: LocalizedStringKey

  @Environment(\.select) private var select

  public init(_ title: LocalizedStringKey) {
    self.title = title
  }

  public var body: some View {
    if !select.registering {
      Text(title)
        .font(TextStyle.xs.font(weight: .semibold))
        .tracking(TextStyle.xs.letterSpacing)
        .foregroundStyle(Color.labelSecondary)
        .padding(.horizontal, 12)
        .padding(.vertical, 10)
        .frame(maxWidth: .infinity, alignment: .leading)
        .accessibilityAddTraits(.isHeader)
    }
  }
}

public struct SelectSeparator: View {
  @Environment(\.select) private var select

  public init() {}

  public var body: some View {
    if !select.registering {
      Rectangle()
        .fill(Color.separator)
        .frame(height: 1)
        .padding(.vertical, 6)
        .padding(.horizontal, -6)
        .accessibilityHidden(true)
    }
  }
}
```

```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)
  }
}
```

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

struct WheelPickerEntry: Equatable {
  let value: AnyHashable
  let disabled: Bool
  let text: Text?
}

struct WheelPickerEntriesKey: PreferenceKey {
  static var defaultValue: [WheelPickerEntry] { [] }

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

struct WheelPickerColumnContext {
  var alignment: Alignment
  var select: @MainActor (AnyHashable) -> Void
}

extension EnvironmentValues {
  @Entry var wheelPickerColumn: WheelPickerColumnContext?
  @Entry var wheelPickerItemInset: CGFloat = 12
}

enum WheelPickerMetrics {
  static let rowHeight: CGFloat = 32
  static let height: CGFloat = rowHeight * 6.75
  static let inset: CGFloat = (height - rowHeight) / 2
}

struct WheelPickerCurve: Equatable {
  static let rowAngle = Double.pi / 10.5
  static let maxAngle = Double.pi / 2
  static let perspective = 1200.0
  static let fadeAngle = 0.35

  let offset: Double
  let scaleX: Double
  let scaleY: Double
  let opacity: Double

  init(distance: Double, height: Double) {
    let radius = height / Self.rowAngle
    let angle = min(max(distance * Self.rowAngle, -Self.maxAngle), Self.maxAngle)
    let away = abs(distance)
    let tone = away < 1 ? 1 - away * 0.45 : 0.55 - (away - 1) * 0.06
    let fade = min(1, (Self.maxAngle - abs(angle)) / Self.fadeAngle)
    let depth = Self.perspective / (Self.perspective + radius - radius * cos(angle))
    offset = radius * sin(angle) - distance * height
    scaleX = depth
    scaleY = depth * cos(angle)
    opacity = max(0, tone * fade)
  }
}

enum WheelPickerNavigation {
  static func enabled(_ disabled: [Bool], from index: Int, step: Int) -> Int? {
    var current = index
    while current >= 0 && current < disabled.count {
      if !disabled[current] { return current }
      current += step
    }
    return nil
  }

  static func nearestEnabled(_ disabled: [Bool], from index: Int) -> Int? {
    for distance in 0..<max(disabled.count, 1) {
      let before = index - distance
      if before >= 0 && before < disabled.count && !disabled[before] { return before }
      let after = index + distance
      if after >= 0 && after < disabled.count && !disabled[after] { return after }
    }
    return nil
  }

  static func centered(offset: CGFloat, count: Int) -> Int {
    guard count > 0 else { return 0 }
    let index = Int((offset / WheelPickerMetrics.rowHeight).rounded())
    return min(max(index, 0), count - 1)
  }
}

struct WheelPickerSnap: ScrollTargetBehavior {
  let disabled: [Bool]

  func updateTarget(_ target: inout ScrollTarget, context: TargetContext) {
    let row = WheelPickerMetrics.rowHeight
    guard !disabled.isEmpty else {
      target.rect.origin.y = (target.rect.minY / row).rounded() * row
      return
    }
    let index = WheelPickerNavigation.centered(offset: target.rect.minY, count: disabled.count)
    let resolved = WheelPickerNavigation.nearestEnabled(disabled, from: index) ?? index
    target.rect.origin.y = CGFloat(resolved) * row
  }
}

public struct WheelPicker<Content: View>: View {
  let spacing: CGFloat
  let content: Content

  public init(spacing: CGFloat = 0, @ViewBuilder content: () -> Content) {
    self.spacing = spacing
    self.content = content()
  }

  public var body: some View {
    HStack(alignment: .center, spacing: spacing) {
      content
    }
    .frame(maxWidth: .infinity)
    .background {
      RoundedRectangle(cornerRadius: Radius.lg, style: .continuous)
        .fill(Color.control)
        .frame(height: WheelPickerMetrics.rowHeight)
    }
  }
}

public struct WheelPickerColumn<Value: Hashable & Sendable, Content: View>: View {
  let selection: Binding<Value>
  let alignment: HorizontalAlignment
  let content: Content

  @State private var entries: [WheelPickerEntry] = []
  @State private var offset: CGFloat = 0
  @State private var settling: Task<Void, Never>?
  @State private var ticks = 0
  @Environment(\.accessibilityReduceMotion) private var reduceMotion

  public init(
    selection: Binding<Value>,
    alignment: HorizontalAlignment = .center,
    @ViewBuilder content: () -> Content
  ) {
    self.selection = selection
    self.alignment = alignment
    self.content = content()
  }

  public var body: some View {
    ScrollViewReader { proxy in
      ScrollView(.vertical, showsIndicators: false) {
        VStack(spacing: 0) {
          content
        }
        .padding(.vertical, WheelPickerMetrics.inset)
        .onGeometryChange(for: CGFloat.self) { geometry in
          geometry.frame(in: .scrollView).minY
        } action: { value in
          offset = -value
          scheduleSettle(proxy)
        }
      }
      .scrollTargetBehavior(WheelPickerSnap(disabled: entries.map(\.disabled)))
      .frame(height: WheelPickerMetrics.height)
      .fixedSize(horizontal: true, vertical: false)
      .clipShape(RoundedRectangle(cornerRadius: Radius.lg, style: .continuous))
      .hapticFeedback(.selection, trigger: ticks)
      .environment(\.wheelPickerColumn, WheelPickerColumnContext(
        alignment: Alignment(horizontal: alignment, vertical: .center),
        select: { value in
          if let next = value.base as? Value { commit(next) }
        }
      ))
      .onPreferenceChange(WheelPickerEntriesKey.self) { value in
        entries = value
      }
      .onAppear {
        proxy.scrollTo(selection.wrappedValue, anchor: .center)
      }
      .onChange(of: selection.wrappedValue) { _, value in
        guard centeredValue != AnyHashable(value) else { return }
        scroll(proxy, to: value)
      }
      .accessibilityElement(children: .ignore)
      .accessibilityValue(entries.first { $0.value == AnyHashable(selection.wrappedValue) }?.text ?? Text(verbatim: String(describing: selection.wrappedValue)))
      .accessibilityAdjustableAction { direction in
        let disabled = entries.map(\.disabled)
        guard let current = entries.firstIndex(where: { $0.value == AnyHashable(selection.wrappedValue) }) else { return }
        let target: Int?
        switch direction {
        case .increment: target = WheelPickerNavigation.enabled(disabled, from: current + 1, step: 1)
        case .decrement: target = WheelPickerNavigation.enabled(disabled, from: current - 1, step: -1)
        @unknown default: target = nil
        }
        if let target, let next = entries[target].value.base as? Value { commit(next) }
      }
    }
  }

  private var centeredValue: AnyHashable? {
    guard !entries.isEmpty else { return nil }
    return entries[WheelPickerNavigation.centered(offset: offset, count: entries.count)].value
  }

  private func commit(_ value: Value) {
    if selection.wrappedValue != value {
      selection.wrappedValue = value
      ticks += 1
    }
  }

  private func scroll(_ proxy: ScrollViewProxy, to value: Value) {
    if reduceMotion {
      proxy.scrollTo(value, anchor: .center)
    } else {
      withAnimation(.timingCurve(0.32, 0.72, 0, 1, duration: 0.3)) {
        proxy.scrollTo(value, anchor: .center)
      }
    }
  }

  private func scheduleSettle(_ proxy: ScrollViewProxy) {
    settling?.cancel()
    settling = Task { @MainActor in
      try? await Task.sleep(for: .milliseconds(150))
      guard !Task.isCancelled else { return }
      settle(proxy)
    }
  }

  private func settle(_ proxy: ScrollViewProxy) {
    guard !entries.isEmpty else { return }
    let centered = WheelPickerNavigation.centered(offset: offset, count: entries.count)
    guard let index = WheelPickerNavigation.nearestEnabled(entries.map(\.disabled), from: centered),
      let next = entries[index].value.base as? Value
    else { return }
    if index != centered { scroll(proxy, to: next) }
    commit(next)
  }
}

public struct WheelPickerItem<Value: Hashable & Sendable, Label: View>: View {
  let value: Value
  let text: Text?
  let label: Label

  @Environment(\.wheelPickerColumn) private var column
  @Environment(\.wheelPickerItemInset) private var inset
  @Environment(\.isEnabled) private var isEnabled

  public init(value: Value, @ViewBuilder label: () -> Label) {
    self.value = value
    text = nil
    self.label = label()
  }

  init(value: Value, text: Text, label: Label) {
    self.value = value
    self.text = text
    self.label = label
  }

  public var body: some View {
    label
      .font(TextStyle.xl.font())
      .tracking(TextStyle.xl.letterSpacing)
      .monospacedDigit()
      .lineLimit(1)
      .fixedSize()
      .foregroundStyle(isEnabled ? Color.label : .labelTertiary)
      .visualEffect { content, geometry in
        let row = Double(WheelPickerMetrics.rowHeight)
        let center = Double(WheelPickerMetrics.height) / 2
        let distance = (Double(geometry.frame(in: .scrollView).midY) - center) / row
        let curve = WheelPickerCurve(distance: distance, height: row)
        return content
          .scaleEffect(x: curve.scaleX, y: curve.scaleY)
          .offset(y: curve.offset)
          .opacity(curve.opacity)
      }
      .padding(.horizontal, inset)
      .frame(maxWidth: .infinity, alignment: column?.alignment ?? .center)
      .frame(height: WheelPickerMetrics.rowHeight)
      .contentShape(Rectangle())
      .onTapGesture {
        if isEnabled { column?.select(AnyHashable(value)) }
      }
      .id(value)
      .preference(key: WheelPickerEntriesKey.self, value: [WheelPickerEntry(value: AnyHashable(value), disabled: !isEnabled, text: text)])
  }
}

extension WheelPickerItem where Label == Text {
  public init(_ title: LocalizedStringKey, value: Value) {
    self.init(value: value, text: Text(title), label: Text(title))
  }

  public init(verbatim title: String, value: Value) {
    self.init(value: value, text: Text(verbatim: title), label: Text(verbatim: title))
  }
}
```

```swift title="swift/Patterns/Adaptive.swift"
import SwiftUI

extension EnvironmentValues {
  @Entry var patternCompact: Bool? = nil
}

@propertyWrapper
struct CompactLayout: DynamicProperty {
  @Environment(\.patternCompact) private var forced
  @Environment(\.horizontalSizeClass) private var sizeClass

  init() {}

  var wrappedValue: Bool {
    forced ?? (sizeClass != .regular)
  }
}

extension Binding where Value == Bool {
  func gated(_ enabled: Bool) -> Binding<Bool> {
    Binding(
      get: { enabled && wrappedValue },
      set: { wrappedValue = $0 }
    )
  }
}
```

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/patterns/DatePicker.kt"
package com.esuiss.ui.patterns

import androidx.compose.foundation.border
import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.layout.widthIn
import androidx.compose.foundation.shape.RoundedCornerShape
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.setValue
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.semantics.error
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.unit.dp
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.CalendarBlank
import com.esuiss.ui.components.Drawer
import com.esuiss.ui.components.DrawerHeader
import com.esuiss.ui.components.DrawerTitle
import com.esuiss.ui.components.Icon
import com.esuiss.ui.components.LocalFieldState
import com.esuiss.ui.components.RegisterPaneTitle
import com.esuiss.ui.components.WheelPicker
import com.esuiss.ui.components.WheelPickerColumn
import com.esuiss.ui.components.controlBackground
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography
import java.util.Calendar
import java.util.Date
import java.util.Locale

private enum class DatePart { Day, Month, Year }

@Composable
fun DatePicker(
    value: Date?,
    onValueChange: (Date) -> Unit,
    modifier: Modifier = Modifier,
    placeholder: String = "Pick a date",
    locale: Locale = Locale.getDefault(),
    fromYear: Int = Calendar.getInstance().get(Calendar.YEAR) - 100,
    toYear: Int = Calendar.getInstance().get(Calendar.YEAR) + 10,
    title: String? = null,
    enabled: Boolean = true,
    invalid: Boolean? = null,
    floating: Boolean = false,
    showCloseButton: Boolean = false,
    closeLabel: String? = null,
) {
    var open by remember { mutableStateOf(false) }
    val label = value?.let {
        android.icu.text.DateFormat.getDateInstance(android.icu.text.DateFormat.MEDIUM, locale).format(it)
    }
    PickerTrigger(
        text = label,
        placeholder = placeholder,
        modifier = modifier,
        enabled = enabled,
        invalid = invalid,
        onClick = { open = true },
        fill = false,
        leading = { tint -> Icon(PhosphorIcons.Regular.CalendarBlank, contentDescription = null, size = 16.dp, tint = tint) },
    )
    Drawer(
        open = open,
        onOpenChange = { open = it },
        floating = floating,
        showCloseButton = showCloseButton,
        closeLabel = closeLabel,
    ) {
        if (title != null) {
            DrawerHeader { DrawerTitle(title) }
        } else {
            RegisterPaneTitle(placeholder)
        }
        DateWheels(
            value = value ?: Date(),
            onValueChange = onValueChange,
            locale = locale,
            fromYear = fromYear,
            toYear = toYear,
            modifier = Modifier
                .padding(16.dp)
                .then(if (showCloseButton && title == null) Modifier.padding(top = 48.dp) else Modifier),
        )
    }
}

@Composable
internal fun PickerTrigger(
    text: String?,
    placeholder: String,
    modifier: Modifier,
    enabled: Boolean,
    invalid: Boolean?,
    onClick: () -> Unit,
    fill: Boolean = true,
    leading: (@Composable (Color) -> Unit)? = null,
    trailing: (@Composable (Color) -> Unit)? = null,
) {
    val colors = EsuissTheme.colors
    val field = LocalFieldState.current
    val isInvalid = invalid ?: field.invalid
    val isEnabled = enabled && field.enabled
    val shape = RoundedCornerShape(Radius.lg)
    val foreground = when {
        !isEnabled -> colors.labelQuaternary
        text == null -> colors.labelSecondary
        else -> colors.label
    }
    val iconTint = if (isEnabled) colors.labelSecondary else colors.labelQuaternary
    Row(
        modifier = modifier
            .then(if (fill) Modifier.fillMaxWidth() else Modifier)
            .height(44.dp)
            .clip(shape)
            .background(controlBackground(colors, isInvalid, isEnabled), shape)
            .border(1.dp, if (isInvalid) colors.danger else Color.Transparent, shape)
            .then(if (isInvalid) Modifier.semantics { error("Invalid") } else Modifier)
            .clickable(
                interactionSource = remember { MutableInteractionSource() },
                indication = null,
                enabled = isEnabled,
                role = Role.Button,
                onClick = onClick,
            )
            .padding(horizontal = 12.dp),
        horizontalArrangement = Arrangement.spacedBy(if (leading != null) 8.dp else 6.dp),
        verticalAlignment = Alignment.CenterVertically,
    ) {
        leading?.invoke(iconTint)
        Box(modifier = Modifier.weight(1f, fill = fill)) {
            BasicText(
                text ?: placeholder,
                style = Typography.base.copy(color = foreground),
                maxLines = 1,
                overflow = TextOverflow.Ellipsis,
            )
        }
        trailing?.invoke(iconTint)
    }
}

private fun partOrder(locale: Locale): List<DatePart> {
    val format = android.icu.text.DateFormat.getDateInstance(android.icu.text.DateFormat.SHORT, locale)
    val pattern = (format as? android.icu.text.SimpleDateFormat)?.toPattern().orEmpty()
    val order = mutableListOf<DatePart>()
    var quoted = false
    pattern.forEach { char ->
        if (char == '\'') quoted = !quoted
        if (quoted) return@forEach
        val part = when (char) {
            'd' -> DatePart.Day
            'M', 'L' -> DatePart.Month
            'y' -> DatePart.Year
            else -> null
        }
        if (part != null && part !in order) order += part
    }
    return if (order.size == 3) order else listOf(DatePart.Month, DatePart.Day, DatePart.Year)
}

private fun daysInMonth(year: Int, month: Int): Int =
    Calendar.getInstance().apply {
        clear()
        set(year, month, 1)
    }.getActualMaximum(Calendar.DAY_OF_MONTH)

@Composable
private fun DateWheels(
    value: Date,
    onValueChange: (Date) -> Unit,
    locale: Locale,
    fromYear: Int,
    toYear: Int,
    modifier: Modifier,
) {
    val calendar = Calendar.getInstance().apply { time = value }
    val year = calendar.get(Calendar.YEAR)
    val month = calendar.get(Calendar.MONTH)
    val day = calendar.get(Calendar.DAY_OF_MONTH)
    val order = remember(locale) { partOrder(locale) }
    val monthNames = remember(locale) {
        val format = android.icu.text.SimpleDateFormat("LLLL", locale)
        List(12) { index ->
            format.format(Calendar.getInstance().apply {
                clear()
                set(2000, index, 1)
            }.time)
        }
    }
    val days = daysInMonth(year, month)
    val update = { nextYear: Int, nextMonth: Int, nextDay: Int ->
        val clamped = minOf(nextDay, daysInMonth(nextYear, nextMonth))
        onValueChange(
            Calendar.getInstance().apply {
                clear()
                set(nextYear, nextMonth, clamped)
            }.time,
        )
    }
    WheelPicker(
        modifier = modifier.fillMaxWidth(),
        horizontalArrangement = Arrangement.spacedBy(24.dp, Alignment.CenterHorizontally),
    ) {
        order.forEach { part ->
            when (part) {
                DatePart.Day -> WheelPickerColumn(
                    value = day.toString(),
                    onValueChange = { update(year, month, it.toInt()) },
                    modifier = Modifier.width(48.dp),
                    label = "Day",
                    horizontalAlignment = Alignment.End,
                    itemPadding = 0.dp,
                ) {
                    for (item in 1..days) WheelPickerItem(item.toString(), item.toString())
                }
                DatePart.Month -> WheelPickerColumn(
                    value = month.toString(),
                    onValueChange = { update(year, it.toInt(), day) },
                    modifier = Modifier.widthIn(min = 96.dp),
                    label = "Month",
                    horizontalAlignment = Alignment.Start,
                    itemPadding = 0.dp,
                ) {
                    monthNames.forEachIndexed { index, name -> WheelPickerItem(index.toString(), name) }
                }
                DatePart.Year -> WheelPickerColumn(
                    value = year.toString(),
                    onValueChange = { update(it.toInt(), month, day) },
                    modifier = Modifier.width(64.dp),
                    label = "Year",
                    horizontalAlignment = Alignment.Start,
                    itemPadding = 0.dp,
                ) {
                    for (item in fromYear..toYear) WheelPickerItem(item.toString(), item.toString())
                }
            }
        }
    }
}
```

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

import androidx.compose.animation.core.CubicBezierEasing
import androidx.compose.animation.core.tween
import androidx.compose.foundation.background
import androidx.compose.foundation.gestures.AnchoredDraggableDefaults
import androidx.compose.foundation.gestures.AnchoredDraggableState
import androidx.compose.foundation.gestures.DraggableAnchors
import androidx.compose.foundation.gestures.Orientation
import androidx.compose.foundation.gestures.anchoredDraggable
import androidx.compose.foundation.gestures.animateTo
import androidx.compose.foundation.gestures.detectTapGestures
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.BoxWithConstraints
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.ColumnScope
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.WindowInsets
import androidx.compose.foundation.layout.WindowInsetsSides
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.heightIn
import androidx.compose.foundation.layout.offset
import androidx.compose.foundation.layout.only
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.safeDrawing
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.windowInsetsPadding
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.Immutable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberUpdatedState
import androidx.compose.runtime.setValue
import androidx.compose.runtime.snapshotFlow
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.RectangleShape
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.input.pointer.pointerInput
import androidx.compose.ui.layout.onSizeChanged
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.semantics.clearAndSetSemantics
import androidx.compose.ui.semantics.paneTitle
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.unit.IntOffset
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Shadows
import com.esuiss.ui.theme.Typography
import com.esuiss.ui.theme.shadow
import kotlin.math.roundToInt
import kotlinx.coroutines.flow.drop

private const val Hidden = -1

private val DrawerEasing = CubicBezierEasing(0.32f, 0.72f, 0f, 1f)

@Immutable
private data class DrawerInfo(
    val hasCloseButton: Boolean,
    val hasCloseLabel: Boolean,
    val fillsHeight: Boolean,
)

private val LocalDrawerInfo = staticCompositionLocalOf { DrawerInfo(false, false, false) }

internal val LocalDrawerSquareTop = staticCompositionLocalOf { false }

@Composable
fun Drawer(
    open: Boolean,
    onOpenChange: (Boolean) -> Unit,
    modifier: Modifier = Modifier,
    snapPoints: List<Float> = emptyList(),
    onSnapPointChange: (Float) -> Unit = {},
    floating: Boolean = false,
    showSwipeHandle: Boolean = false,
    showCloseButton: Boolean = false,
    closeLabel: String? = null,
    content: @Composable ColumnScope.() -> Unit,
) {
    val squareTop = LocalDrawerSquareTop.current
    var visible by remember { mutableStateOf(false) }
    if (open && !visible) visible = true
    val state = remember { AnchoredDraggableState(initialValue = Hidden) }
    var sheetHeight by remember { mutableIntStateOf(0) }
    val paneTitle = remember { PaneTitleState() }
    val spec = tween<Float>(450, easing = DrawerEasing)
    val currentOpen by rememberUpdatedState(open)
    val currentOnOpenChange by rememberUpdatedState(onOpenChange)
    val currentOnSnapPointChange by rememberUpdatedState(onSnapPointChange)
    val currentSnapPoints by rememberUpdatedState(snapPoints)
    val close = { if (open) onOpenChange(false) }

    LaunchedEffect(open, sheetHeight) {
        if (sheetHeight == 0) {
            if (!open) visible = false
            return@LaunchedEffect
        }
        if (open) {
            if (state.targetValue == Hidden) state.animateTo(0, spec)
        } else {
            state.animateTo(Hidden, tween(300, easing = DrawerEasing))
            visible = false
            sheetHeight = 0
        }
    }

    LaunchedEffect(state) {
        snapshotFlow { state.settledValue }.drop(1).collect { value ->
            if (value == Hidden) {
                if (currentOpen) currentOnOpenChange(false)
            } else {
                currentSnapPoints.getOrNull(value)?.let { currentOnSnapPointChange(it) }
            }
        }
    }

    val colors = EsuissTheme.colors
    val density = LocalDensity.current
    ModalWindow(
        visible = visible,
        onDismissRequest = close,
        dismissOnBackPress = true,
        paneTitle = paneTitle.value,
    ) {
        BoxWithConstraints(modifier = Modifier.fillMaxSize()) {
            val windowHeight = constraints.maxHeight
            val topInset = WindowInsets.safeDrawing.getTop(density)
            val maxSheetHeight = windowHeight - maxOf(with(density) { 96.dp.roundToPx() }, topInset + with(density) { 24.dp.roundToPx() })
            val fixedHeight = if (snapPoints.isNotEmpty()) {
                minOf(maxSheetHeight, (snapPoints.max() * windowHeight).roundToInt())
            } else {
                null
            }
            val rawOffset = state.offset
            val offset = if (rawOffset.isNaN()) sheetHeight.toFloat() else rawOffset
            val lowestOpen = if (snapPoints.isEmpty()) {
                0f
            } else {
                sheetHeight - minOf(sheetHeight.toFloat(), snapPoints.min() * windowHeight)
            }
            val scrimAlpha = if (sheetHeight == 0) {
                0f
            } else {
                ((sheetHeight - offset) / (sheetHeight - lowestOpen).coerceAtLeast(1f)).coerceIn(0f, 1f)
            }

            Box(
                modifier = Modifier
                    .fillMaxSize()
                    .graphicsLayer { alpha = scrimAlpha }
                    .background(colors.scrim)
                    .pointerInput(Unit) { detectTapGestures { close() } },
            )

            val shape = when {
                floating -> RoundedCornerShape(Radius.xl3)
                squareTop -> RectangleShape
                else -> RoundedCornerShape(topStart = Radius.xl3, topEnd = Radius.xl3)
            }
            Box(
                modifier = Modifier
                    .align(Alignment.BottomCenter)
                    .fillMaxWidth()
                    .then(
                        if (floating) {
                            Modifier
                                .windowInsetsPadding(WindowInsets.safeDrawing.only(WindowInsetsSides.Bottom + WindowInsetsSides.Horizontal))
                                .padding(8.dp)
                        } else {
                            Modifier
                        },
                    )
                    .offset { IntOffset(0, offset.roundToInt()) }
                    .graphicsLayer { alpha = if (rawOffset.isNaN()) 0f else 1f }
                    .then(
                        if (fixedHeight != null) {
                            Modifier.height(with(density) { fixedHeight.toDp() })
                        } else {
                            Modifier.heightIn(max = with(density) { maxSheetHeight.toDp() })
                        },
                    )
                    .onSizeChanged { size ->
                        val height = size.height
                        val anchors = DraggableAnchors {
                            Hidden at height.toFloat()
                            if (snapPoints.isEmpty()) {
                                0 at 0f
                            } else {
                                snapPoints.forEachIndexed { index, point ->
                                    index at height - minOf(height.toFloat(), point * windowHeight)
                                }
                            }
                        }
                        state.updateAnchors(anchors, state.targetValue)
                        sheetHeight = height
                    }
                    .anchoredDraggable(
                        state = state,
                        orientation = Orientation.Vertical,
                        flingBehavior = AnchoredDraggableDefaults.flingBehavior(
                            state = state,
                            positionalThreshold = { it * 0.5f },
                            animationSpec = spec,
                        ),
                    )
                    .then(modifier)
                    .shadow(Shadows.lg, shape)
                    .clip(shape)
                    .background(colors.surfaceRaised, shape)
                    .pointerInput(Unit) {}
                    .semantics { paneTitle.value?.let { this.paneTitle = it } },
            ) {
                Column(
                    modifier = Modifier
                        .fillMaxWidth()
                        .then(if (floating) Modifier else Modifier.windowInsetsPadding(WindowInsets.safeDrawing.only(WindowInsetsSides.Bottom))),
                ) {
                    if (showSwipeHandle) DrawerHandle()
                    CompositionLocalProvider(
                        LocalDrawerSquareTop provides false,
                        LocalPaneTitle provides paneTitle,
                        LocalDrawerInfo provides DrawerInfo(showCloseButton, showCloseButton && closeLabel != null, fixedHeight != null),
                        LocalContentStyle provides Typography.base.copy(color = colors.label),
                        LocalContentColor provides colors.label,
                    ) {
                        Column(
                            modifier = Modifier.fillMaxWidth().then(if (fixedHeight != null) Modifier.weight(1f) else Modifier),
                            content = content,
                        )
                    }
                }
                if (showCloseButton) {
                    OverlayCloseButton(
                        onClick = close,
                        label = closeLabel,
                        modifier = Modifier
                            .align(Alignment.TopEnd)
                            .padding(
                                top = (if (showSwipeHandle) 23.dp else 11.dp) - (if (closeLabel != null) 0.dp else 6.dp),
                                end = if (closeLabel != null) 16.dp else 10.dp,
                            ),
                    )
                }
            }
        }
    }
}

@Composable
private fun DrawerHandle() {
    Box(
        modifier = Modifier
            .fillMaxWidth()
            .height(12.dp)
            .clearAndSetSemantics {},
        contentAlignment = Alignment.BottomCenter,
    ) {
        Box(
            modifier = Modifier
                .size(width = 36.dp, height = 5.dp)
                .background(EsuissTheme.colors.labelQuaternary, CircleShape),
        )
    }
}

@Composable
fun DrawerHeader(
    modifier: Modifier = Modifier,
    content: @Composable ColumnScope.() -> Unit,
) {
    val info = LocalDrawerInfo.current
    val horizontal = when {
        info.hasCloseLabel -> 96.dp
        info.hasCloseButton -> 56.dp
        else -> 16.dp
    }
    Column(
        modifier = modifier.fillMaxWidth().padding(start = horizontal, end = horizontal, top = 16.dp),
        horizontalAlignment = Alignment.CenterHorizontally,
        verticalArrangement = Arrangement.spacedBy(2.dp),
        content = content,
    )
}

@Composable
fun ColumnScope.DrawerFooter(
    modifier: Modifier = Modifier,
    content: @Composable ColumnScope.() -> Unit,
) {
    if (LocalDrawerInfo.current.fillsHeight) {
        Spacer(Modifier.weight(1f))
    }
    Column(
        modifier = modifier.fillMaxWidth().padding(start = 16.dp, end = 16.dp, bottom = 16.dp),
        verticalArrangement = Arrangement.spacedBy(8.dp),
        content = content,
    )
}

@Composable
fun DrawerTitle(text: String, modifier: Modifier = Modifier) {
    OverlayTitle(text, modifier, titleStyle(EsuissTheme.colors, centered = true))
}

@Composable
fun DrawerDescription(text: String, modifier: Modifier = Modifier) {
    BasicText(text, modifier = modifier, style = descriptionStyle(EsuissTheme.colors, centered = true))
}
```

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

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

enum class FieldOrientation { Vertical, Horizontal, Responsive }

enum class FieldGroupVariant { Default, Inset }

enum class FieldLegendVariant { Legend, Label }

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

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

private val LocalFieldSetInset = staticCompositionLocalOf { false }

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

private val LocalFieldInset = staticCompositionLocalOf { false }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

import android.os.Build
import android.view.Window
import android.view.WindowManager
import androidx.compose.animation.AnimatedVisibility
import androidx.compose.animation.AnimatedVisibilityScope
import androidx.compose.animation.EnterExitState
import androidx.compose.animation.core.MutableTransitionState
import androidx.compose.animation.core.animateFloat
import androidx.compose.animation.core.tween
import androidx.compose.animation.fadeIn
import androidx.compose.animation.fadeOut
import androidx.compose.animation.scaleIn
import androidx.compose.animation.scaleOut
import androidx.compose.animation.slideIn
import androidx.compose.foundation.background
import androidx.compose.foundation.border
import androidx.compose.foundation.clickable
import androidx.compose.foundation.gestures.awaitEachGesture
import androidx.compose.foundation.gestures.awaitFirstDown
import androidx.compose.foundation.gestures.detectTapGestures
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.interaction.collectIsPressedAsState
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.WindowInsets
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.ime
import androidx.compose.foundation.layout.padding
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.SideEffect
import androidx.compose.runtime.Stable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableIntStateOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberUpdatedState
import androidx.compose.runtime.setValue
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.graphics.CompositingStrategy
import androidx.compose.ui.graphics.Shape
import androidx.compose.ui.graphics.TransformOrigin
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.input.pointer.PointerEventPass
import androidx.compose.ui.input.pointer.pointerInput
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.platform.LocalView
import androidx.compose.ui.platform.LocalWindowInfo
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.heading
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.IntOffset
import androidx.compose.ui.unit.IntRect
import androidx.compose.ui.unit.IntSize
import androidx.compose.ui.unit.LayoutDirection
import androidx.compose.ui.unit.dp
import androidx.compose.ui.window.Dialog as WindowDialog
import androidx.compose.ui.window.DialogProperties
import androidx.compose.ui.window.DialogWindowProvider
import androidx.compose.ui.window.Popup
import androidx.compose.ui.window.PopupPositionProvider
import androidx.compose.ui.window.PopupProperties
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.X
import com.esuiss.ui.theme.Colors
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Shadow
import com.esuiss.ui.theme.Shadows
import com.esuiss.ui.theme.Typography
import com.esuiss.ui.theme.shadow
import kotlin.math.max
import kotlin.math.min

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

enum class PopupAlign { Start, Center, End }

internal val PopupInset = 16.dp

internal val PopupMargin = 8.dp

@Stable
internal class PopupPlacement {
    var anchorWidth by mutableIntStateOf(0)
}

internal class AnchoredPositionProvider(
    private val side: PopupSide,
    private val align: PopupAlign,
    private val sideOffset: Int,
    private val alignOffset: Int,
    private val inset: Int,
    private val margin: Int,
    private val bottomLimit: Int,
    private val point: IntOffset?,
    private val placement: PopupPlacement,
) : PopupPositionProvider {
    override fun calculatePosition(
        anchorBounds: IntRect,
        windowSize: IntSize,
        layoutDirection: LayoutDirection,
        popupContentSize: IntSize,
    ): IntOffset {
        val anchor = if (point != null) {
            val x = anchorBounds.left + point.x
            val y = anchorBounds.top + point.y
            IntRect(x, y, x, y)
        } else {
            anchorBounds
        }
        val width = (popupContentSize.width - inset * 2).coerceAtLeast(0)
        val height = (popupContentSize.height - inset * 2).coerceAtLeast(0)
        val left = margin
        val top = margin
        val right = windowSize.width - margin
        val bottom = min(windowSize.height, bottomLimit) - margin

        fun space(candidate: PopupSide): Int = when (candidate) {
            PopupSide.Bottom -> bottom - anchor.bottom - sideOffset
            PopupSide.Top -> anchor.top - sideOffset - top
            PopupSide.Right -> right - anchor.right - sideOffset
            PopupSide.Left -> anchor.left - sideOffset - left
        }

        val opposite = when (side) {
            PopupSide.Bottom -> PopupSide.Top
            PopupSide.Top -> PopupSide.Bottom
            PopupSide.Left -> PopupSide.Right
            PopupSide.Right -> PopupSide.Left
        }
        val vertical = side == PopupSide.Top || side == PopupSide.Bottom
        val needed = if (vertical) height else width
        val resolved = if (space(side) >= needed || space(side) >= space(opposite)) side else opposite
        val rtl = layoutDirection == LayoutDirection.Rtl

        var x: Int
        var y: Int
        if (vertical) {
            x = when (align) {
                PopupAlign.Start -> if (rtl) anchor.right - width else anchor.left
                PopupAlign.Center -> anchor.left + (anchor.width - width) / 2
                PopupAlign.End -> if (rtl) anchor.left else anchor.right - width
            } + if (rtl) -alignOffset else alignOffset
            y = if (resolved == PopupSide.Bottom) anchor.bottom + sideOffset else anchor.top - sideOffset - height
        } else {
            y = when (align) {
                PopupAlign.Start -> anchor.top
                PopupAlign.Center -> anchor.top + (anchor.height - height) / 2
                PopupAlign.End -> anchor.bottom - height
            } + alignOffset
            x = if (resolved == PopupSide.Right) anchor.right + sideOffset else anchor.left - sideOffset - width
        }
        x = x.coerceIn(left, max(left, right - width))
        y = y.coerceIn(top, max(top, bottom - height))
        placement.anchorWidth = anchorBounds.width
        return IntOffset(x - inset, y - inset)
    }
}

private fun transformOrigin(side: PopupSide): TransformOrigin = when (side) {
    PopupSide.Bottom -> TransformOrigin(0.5f, 0f)
    PopupSide.Top -> TransformOrigin(0.5f, 1f)
    PopupSide.Left -> TransformOrigin(1f, 0.5f)
    PopupSide.Right -> TransformOrigin(0f, 0.5f)
}

@Composable
internal fun AnchoredPopup(
    expanded: Boolean,
    onDismissRequest: () -> Unit,
    side: PopupSide = PopupSide.Bottom,
    align: PopupAlign = PopupAlign.Center,
    sideOffset: Dp = 4.dp,
    alignOffset: Dp = 0.dp,
    focusable: Boolean = true,
    point: IntOffset? = null,
    enterMillis: Int = 150,
    exitMillis: Int = 100,
    content: @Composable (PopupPlacement) -> Unit,
) {
    val transition = remember { MutableTransitionState(false) }
    transition.targetState = expanded
    if (!transition.currentState && !transition.targetState) return

    val density = LocalDensity.current
    val imeBottom = WindowInsets.ime.getBottom(density)
    val containerHeight = LocalWindowInfo.current.containerSize.height
    val bottomLimit = if (containerHeight > 0) containerHeight - imeBottom else Int.MAX_VALUE
    val placement = remember { PopupPlacement() }
    val provider = remember(side, align, sideOffset, alignOffset, point, bottomLimit, density) {
        with(density) {
            AnchoredPositionProvider(
                side = side,
                align = align,
                sideOffset = sideOffset.roundToPx(),
                alignOffset = alignOffset.roundToPx(),
                inset = PopupInset.roundToPx(),
                margin = PopupMargin.roundToPx(),
                bottomLimit = bottomLimit,
                point = point,
                placement = placement,
            )
        }
    }
    val currentExpanded by rememberUpdatedState(expanded)
    val dismiss by rememberUpdatedState(onDismissRequest)
    val properties = PopupProperties(
        focusable = focusable,
        dismissOnBackPress = true,
        dismissOnClickOutside = true,
    )
    val slide = with(density) { 8.dp.roundToPx() }
    val origin = transformOrigin(side)
    Popup(
        popupPositionProvider = provider,
        onDismissRequest = { if (currentExpanded) dismiss() },
        properties = properties,
    ) {
        Box(
            modifier = Modifier
                .pointerInput(Unit) {
                    val insetPx = PopupInset.toPx()
                    detectTapGestures { position ->
                        val inside = position.x >= insetPx && position.y >= insetPx &&
                            position.x <= size.width - insetPx && position.y <= size.height - insetPx
                        if (!inside && currentExpanded) dismiss()
                    }
                }
                .padding(PopupInset),
        ) {
            AnimatedVisibility(
                visibleState = transition,
                enter = scaleIn(tween(enterMillis), initialScale = 0.95f, transformOrigin = origin) +
                    slideIn(tween(enterMillis)) {
                        when (side) {
                            PopupSide.Bottom -> IntOffset(0, -slide)
                            PopupSide.Top -> IntOffset(0, slide)
                            PopupSide.Left -> IntOffset(slide, 0)
                            PopupSide.Right -> IntOffset(-slide, 0)
                        }
                    },
                exit = scaleOut(tween(exitMillis), targetScale = 0.95f, transformOrigin = origin),
            ) {
                Box(fadeWithShadow(enterMillis, exitMillis)) {
                    CompositionLocalProvider(LocalButtonGroup provides null) {
                        content(placement)
                    }
                }
            }
        }
    }
}

@Composable
internal fun ModalWindow(
    visible: Boolean,
    onDismissRequest: () -> Unit,
    dismissOnBackPress: Boolean,
    paneTitle: String?,
    content: @Composable () -> Unit,
) {
    if (!visible) return
    WindowDialog(
        onDismissRequest = onDismissRequest,
        properties = DialogProperties(
            dismissOnBackPress = dismissOnBackPress,
            dismissOnClickOutside = false,
            usePlatformDefaultWidth = false,
            decorFitsSystemWindows = false,
            windowTitle = paneTitle.orEmpty(),
        ),
    ) {
        val window = (LocalView.current.parent as? DialogWindowProvider)?.window
        SideEffect {
            window?.apply {
                setDimAmount(0f)
                clearFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND)
                setLayout(WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.MATCH_PARENT)
                val params = attributes
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
                    params.fitInsetsTypes = 0
                    params.fitInsetsSides = 0
                    params.layoutInDisplayCutoutMode = WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_ALWAYS
                } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
                    params.layoutInDisplayCutoutMode = WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES
                }
                attributes = params
                addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS)
                clearSystemBarColors()
            }
        }
        CompositionLocalProvider(LocalButtonGroup provides null, content = content)
    }
}

@Suppress("DEPRECATION")
private fun Window.clearSystemBarColors() {
    statusBarColor = android.graphics.Color.TRANSPARENT
    navigationBarColor = android.graphics.Color.TRANSPARENT
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
        isStatusBarContrastEnforced = false
        isNavigationBarContrastEnforced = false
    }
}

@Composable
internal fun AnimatedVisibilityScope.fadeWithShadow(enterMillis: Int, exitMillis: Int): Modifier {
    val alpha by transition.animateFloat(
        transitionSpec = { tween(if (targetState == EnterExitState.Visible) enterMillis else exitMillis) },
        label = "alpha",
    ) { if (it == EnterExitState.Visible) 1f else 0f }
    return Modifier.graphicsLayer {
        this.alpha = alpha
        compositingStrategy = CompositingStrategy.ModulateAlpha
    }
}

@Composable
internal fun Scrim(
    transition: MutableTransitionState<Boolean>,
    enterMillis: Int,
    exitMillis: Int,
    onClick: (() -> Unit)?,
) {
    val color = EsuissTheme.colors.scrim
    val click by rememberUpdatedState(onClick)
    AnimatedVisibility(
        visibleState = transition,
        enter = fadeIn(tween(enterMillis)),
        exit = fadeOut(tween(exitMillis)),
    ) {
        Box(
            modifier = Modifier
                .fillMaxSize()
                .background(color)
                .pointerInput(Unit) { detectTapGestures { click?.invoke() } },
        )
    }
}

@Stable
internal class PaneTitleState {
    var value by mutableStateOf<String?>(null)
}

internal val LocalPaneTitle = staticCompositionLocalOf<PaneTitleState?> { null }

@Composable
internal fun RegisterPaneTitle(text: String) {
    val state = LocalPaneTitle.current
    SideEffect { state?.value = text }
}

internal fun Modifier.raisedSurface(colors: Colors, shape: Shape, shadow: Shadow = Shadows.lg): Modifier =
    this
        .shadow(shadow, shape)
        .clip(shape)
        .background(colors.surfaceRaised, shape)
        .border(1.dp, colors.label.copy(alpha = if (colors.isDark) 0.1f else 0.05f), shape)

internal fun titleStyle(colors: Colors, style: TextStyle = Typography.base, centered: Boolean = false): TextStyle =
    style.copy(
        color = colors.label,
        fontWeight = FontWeight.SemiBold,
        textAlign = if (centered) TextAlign.Center else TextAlign.Unspecified,
    )

internal fun descriptionStyle(colors: Colors, centered: Boolean = false): TextStyle =
    Typography.sm.copy(
        color = colors.labelSecondary,
        textAlign = if (centered) TextAlign.Center else TextAlign.Unspecified,
    )

@Composable
internal fun OverlayTitle(text: String, modifier: Modifier, style: TextStyle) {
    RegisterPaneTitle(text)
    BasicText(text, modifier = modifier.semantics { heading() }, style = style)
}

@Composable
internal fun OverlayCloseButton(
    onClick: () -> Unit,
    label: String?,
    modifier: Modifier = Modifier,
) {
    val colors = EsuissTheme.colors
    if (label != null) {
        Button(onClick = onClick, modifier = modifier, variant = ButtonVariant.Plain, size = ButtonSize.Sm) {
            BasicText(label, style = Typography.base.copy(color = LocalContentColor.current), maxLines = 1)
        }
        return
    }
    val interaction = remember { MutableInteractionSource() }
    val pressed by interaction.collectIsPressedAsState()
    Box(
        modifier = modifier
            .size(44.dp)
            .clip(CircleShape)
            .clickable(interactionSource = interaction, indication = null, role = Role.Button, onClick = onClick)
            .semantics { contentDescription = "Close" },
        contentAlignment = Alignment.Center,
    ) {
        Box(
            modifier = Modifier
                .size(32.dp)
                .background(if (pressed) colors.separator else colors.surfaceTertiary, CircleShape),
            contentAlignment = Alignment.Center,
        ) {
            Icon(PhosphorIcons.Regular.X, contentDescription = null, size = 16.dp, tint = colors.label)
        }
    }
}

@Composable
internal fun rememberLongPressModifier(enabled: Boolean, onLongPress: (Offset) -> Unit): Modifier {
    val callback by rememberUpdatedState(onLongPress)
    if (!enabled) return Modifier
    return Modifier.pointerInput(Unit) {
        awaitEachGesture {
            val down = awaitFirstDown(requireUnconsumed = false, pass = PointerEventPass.Initial)
            val released = withTimeoutOrNull(viewConfiguration.longPressTimeoutMillis) {
                while (true) {
                    val event = awaitPointerEvent(PointerEventPass.Initial)
                    val change = event.changes.firstOrNull { it.id == down.id }
                    if (change == null || !change.pressed) break
                    if ((change.position - down.position).getDistance() > viewConfiguration.touchSlop) break
                }
                true
            }
            if (released == null) {
                callback(down.position)
                while (true) {
                    val event = awaitPointerEvent(PointerEventPass.Initial)
                    event.changes.forEach { it.consume() }
                    if (event.changes.none { it.pressed }) break
                }
            }
        }
    }
}
```

```kt title="kotlin/components/Select.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.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.ColumnScope
import androidx.compose.foundation.layout.IntrinsicSize
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.heightIn
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.selection.selectable
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.foundation.verticalScroll
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.DisposableEffect
import androidx.compose.runtime.Immutable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateMapOf
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.runtime.snapshots.SnapshotStateMap
import androidx.compose.runtime.staticCompositionLocalOf
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.layout.Layout
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.semantics.Role
import androidx.compose.ui.semantics.heading
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.semantics.stateDescription
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.max
import com.adamglin.PhosphorIcons
import com.adamglin.phosphoricons.Regular
import com.adamglin.phosphoricons.regular.CaretUpDown
import com.adamglin.phosphoricons.regular.Check
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 SelectSize(val height: Dp, val radius: Dp) {
    Default(44.dp, Radius.lg),
    Sm(36.dp, Radius.md),
}

@Immutable
class SelectOption(val value: String, val label: String, val enabled: Boolean = true)

@Immutable
private data class SelectContext(val value: String?, val onSelect: (String) -> Unit)

private val LocalSelect = staticCompositionLocalOf { SelectContext(null) {} }

private val LocalSelectLabels = staticCompositionLocalOf<SnapshotStateMap<String, String>?> { null }

internal fun controlBackground(colors: Colors, invalid: Boolean, enabled: Boolean): Color = when {
    !enabled -> colors.controlDisabled
    invalid -> colors.danger.copy(alpha = if (colors.isDark) 0.1f else 0.05f)
    else -> colors.control
}

@Composable
fun Select(
    value: String?,
    onValueChange: (String) -> Unit,
    options: List<SelectOption>,
    modifier: Modifier = Modifier,
    placeholder: String = "",
    size: SelectSize = SelectSize.Default,
    invalid: Boolean? = null,
    enabled: Boolean = true,
    side: PopupSide = PopupSide.Bottom,
    align: PopupAlign = PopupAlign.Center,
    sideOffset: Dp = 4.dp,
) {
    Select(
        value = value,
        onValueChange = onValueChange,
        displayValue = options.firstOrNull { it.value == value }?.label,
        modifier = modifier,
        placeholder = placeholder,
        size = size,
        invalid = invalid,
        enabled = enabled,
        side = side,
        align = align,
        sideOffset = sideOffset,
    ) {
        SelectGroup {
            options.forEach { SelectItem(it.value, it.label, enabled = it.enabled) }
        }
    }
}

@Composable
fun Select(
    value: String?,
    onValueChange: (String) -> Unit,
    displayValue: String?,
    modifier: Modifier = Modifier,
    placeholder: String = "",
    size: SelectSize = SelectSize.Default,
    invalid: Boolean? = null,
    enabled: Boolean = true,
    side: PopupSide = PopupSide.Bottom,
    align: PopupAlign = PopupAlign.Center,
    sideOffset: Dp = 4.dp,
    content: @Composable ColumnScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val field = LocalFieldState.current
    val isInvalid = invalid ?: field.invalid
    val isEnabled = enabled && field.enabled
    var expanded by remember { mutableStateOf(false) }
    val item = rememberButtonGroupItem(LocalButtonGroup.current, RoundedCornerShape(size.radius))
    val shape = item.shape
    val labels = remember { mutableStateMapOf<String, String>() }
    val text = displayValue ?: value?.let { labels[it] ?: it }
    val foreground = when {
        !isEnabled -> colors.labelQuaternary
        text == null -> colors.labelSecondary
        else -> colors.label
    }
    Box(modifier = modifier.then(item.modifier), propagateMinConstraints = true) {
        if (displayValue == null) {
            Layout(
                content = {
                    CompositionLocalProvider(LocalSelectLabels provides labels) { Column(content = content) }
                },
            ) { _, _ -> layout(0, 0) {} }
        }
        Row(
            modifier = Modifier
                .width(IntrinsicSize.Max)
                .height(size.height)
                .clip(shape)
                .background(controlBackground(colors, isInvalid, isEnabled), shape)
                .border(1.dp, if (isInvalid) colors.danger else Color.Transparent, shape)
                .semantics { stateDescription = if (expanded) "Expanded" else "Collapsed" }
                .clickable(
                    interactionSource = remember { MutableInteractionSource() },
                    indication = null,
                    enabled = isEnabled,
                    role = Role.DropdownList,
                    onClick = { expanded = !expanded },
                )
                .padding(horizontal = 12.dp),
            horizontalArrangement = Arrangement.spacedBy(6.dp),
            verticalAlignment = Alignment.CenterVertically,
        ) {
            BasicText(
                text ?: placeholder,
                modifier = Modifier.weight(1f),
                style = Typography.base.copy(color = foreground),
                maxLines = 1,
                overflow = TextOverflow.Ellipsis,
            )
            Icon(PhosphorIcons.Regular.CaretUpDown, contentDescription = null, size = 16.dp, tint = colors.labelSecondary)
        }
        AnchoredPopup(
            expanded = expanded,
            onDismissRequest = { expanded = false },
            side = side,
            align = align,
            sideOffset = sideOffset,
        ) { placement ->
            val anchorWidth = with(LocalDensity.current) { placement.anchorWidth.toDp() }
            CompositionLocalProvider(
                LocalSelect provides SelectContext(value) {
                    onValueChange(it)
                    expanded = false
                },
                LocalContentStyle provides Typography.base.copy(color = colors.label),
                LocalContentColor provides colors.label,
            ) {
                Column(
                    modifier = Modifier
                        .width(max(anchorWidth, 144.dp))
                        .raisedSurface(colors, RoundedCornerShape(Radius.xl))
                        .verticalScroll(rememberScrollState()),
                    content = content,
                )
            }
        }
    }
}

@Composable
fun SelectGroup(
    modifier: Modifier = Modifier,
    content: @Composable ColumnScope.() -> Unit,
) {
    Column(modifier = modifier.fillMaxWidth().padding(6.dp), content = content)
}

@Composable
fun SelectLabel(text: String, modifier: Modifier = Modifier) {
    BasicText(
        text,
        modifier = modifier
            .fillMaxWidth()
            .semantics { heading() }
            .padding(horizontal = 12.dp, vertical = 10.dp),
        style = Typography.xs.copy(color = EsuissTheme.colors.labelSecondary, fontWeight = FontWeight.SemiBold),
    )
}

@Composable
fun SelectItem(
    value: String,
    text: String,
    modifier: Modifier = Modifier,
    enabled: Boolean = true,
) {
    val labels = LocalSelectLabels.current
    if (labels != null) {
        DisposableEffect(labels, value, text) {
            labels[value] = text
            onDispose { labels.remove(value) }
        }
        return
    }
    val colors = EsuissTheme.colors
    val select = LocalSelect.current
    val selected = select.value == value
    val interaction = remember { MutableInteractionSource() }
    val pressed by interaction.collectIsPressedAsState()
    val shape = RoundedCornerShape(Radius.md)
    Box(
        modifier = modifier
            .fillMaxWidth()
            .heightIn(min = 44.dp)
            .clip(shape)
            .background(if (pressed && enabled) colors.itemPressed else Color.Transparent, shape)
            .selectable(
                selected = selected,
                interactionSource = interaction,
                indication = null,
                enabled = enabled,
                role = Role.RadioButton,
                onClick = { select.onSelect(value) },
            )
            .padding(start = 12.dp, end = 8.dp),
        contentAlignment = Alignment.CenterStart,
    ) {
        BasicText(
            text,
            modifier = Modifier.padding(end = 24.dp, top = 8.dp, bottom = 8.dp),
            style = Typography.base.copy(color = if (enabled) colors.label else colors.labelQuaternary),
            maxLines = 1,
            overflow = TextOverflow.Ellipsis,
        )
        if (selected) {
            Icon(
                PhosphorIcons.Regular.Check,
                contentDescription = null,
                modifier = Modifier.align(Alignment.CenterEnd),
                size = 16.dp,
                tint = colors.link,
            )
        }
    }
}

@Composable
fun SelectSeparator(modifier: Modifier = Modifier) {
    Box(
        modifier = modifier
            .padding(vertical = 6.dp)
            .fillMaxWidth()
            .height(1.dp)
            .background(EsuissTheme.colors.separator),
    )
}
```

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

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

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

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

import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.gestures.snapping.SnapPosition
import androidx.compose.foundation.gestures.snapping.rememberSnapFlingBehavior
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.PaddingValues
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.wrapContentWidth
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.LazyListState
import androidx.compose.foundation.lazy.itemsIndexed
import androidx.compose.foundation.lazy.rememberLazyListState
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.BasicText
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.Immutable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberUpdatedState
import androidx.compose.runtime.snapshotFlow
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.layout.Layout
import androidx.compose.ui.semantics.ProgressBarRangeInfo
import androidx.compose.ui.semantics.clearAndSetSemantics
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.progressBarRangeInfo
import androidx.compose.ui.semantics.setProgress
import androidx.compose.ui.semantics.stateDescription
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Radius
import com.esuiss.ui.theme.Typography
import kotlin.math.PI
import kotlin.math.abs
import kotlin.math.cos
import kotlin.math.max
import kotlin.math.min
import kotlin.math.roundToInt
import kotlin.math.sin
import kotlinx.coroutines.flow.drop
import kotlinx.coroutines.flow.filter

private val WheelItemHeight = 32.dp

private const val RowAngle = (PI / 10.5).toFloat()

private const val MaxAngle = (PI / 2).toFloat()

private const val Perspective = 1200f

private const val FadeAngle = 0.35f

@Immutable
private class WheelEntry(
    val value: String,
    val text: String?,
    val enabled: Boolean,
    val content: @Composable () -> Unit,
)

interface WheelPickerColumnScope {
    fun WheelPickerItem(value: String, enabled: Boolean = true, content: @Composable () -> Unit)

    fun WheelPickerItem(value: String, text: String, enabled: Boolean = true)
}

private class WheelPickerColumnScopeImpl : WheelPickerColumnScope {
    val entries = mutableListOf<WheelEntry>()

    override fun WheelPickerItem(value: String, enabled: Boolean, content: @Composable () -> Unit) {
        entries += WheelEntry(value, null, enabled, content)
    }

    override fun WheelPickerItem(value: String, text: String, enabled: Boolean) {
        entries += WheelEntry(value, text, enabled) {
            BasicText(text, style = LocalContentStyle.current, maxLines = 1, softWrap = false)
        }
    }
}

@Composable
fun WheelPicker(
    modifier: Modifier = Modifier,
    horizontalArrangement: Arrangement.Horizontal = Arrangement.Center,
    content: @Composable RowScope.() -> Unit,
) {
    Box(modifier = modifier, contentAlignment = Alignment.Center) {
        Box(
            modifier = Modifier
                .fillMaxWidth()
                .height(WheelItemHeight)
                .background(EsuissTheme.colors.control, RoundedCornerShape(Radius.lg)),
        )
        Row(
            horizontalArrangement = horizontalArrangement,
            verticalAlignment = Alignment.CenterVertically,
            content = content,
        )
    }
}

@Composable
fun WheelPickerColumn(
    value: String?,
    onValueChange: (String) -> Unit,
    modifier: Modifier = Modifier,
    label: String? = null,
    horizontalAlignment: Alignment.Horizontal = Alignment.CenterHorizontally,
    itemPadding: Dp = 12.dp,
    content: WheelPickerColumnScope.() -> Unit,
) {
    val colors = EsuissTheme.colors
    val entries = WheelPickerColumnScopeImpl().apply(content).entries.toList()
    val selectedIndex = entries.indexOfFirst { it.value == value }
    val state = rememberLazyListState(initialFirstVisibleItemIndex = selectedIndex.coerceAtLeast(0))
    val fling = rememberSnapFlingBehavior(state, SnapPosition.Center)
    val reducedMotion = formReducedMotion()
    val currentValue by rememberUpdatedState(value)
    val currentEntries by rememberUpdatedState(entries)
    val haptics = rememberHaptics()
    val select: (String) -> Unit = {
        if (it != value) haptics.selection()
        onValueChange(it)
    }
    val currentOnValueChange by rememberUpdatedState(select)

    LaunchedEffect(state) {
        snapshotFlow { state.isScrollInProgress }
            .drop(1)
            .filter { !it }
            .collect {
                val list = currentEntries
                if (list.isEmpty()) return@collect
                val centered = state.wheelPosition().roundToInt().coerceIn(0, list.lastIndex)
                val index = nearestEnabledIndex(list, centered)
                if (index < 0) return@collect
                if (index != centered) {
                    if (reducedMotion) state.scrollToItem(index) else state.animateScrollToItem(index)
                }
                if (list[index].value != currentValue) currentOnValueChange(list[index].value)
            }
    }

    LaunchedEffect(value, entries.size) {
        if (selectedIndex < 0 || state.isScrollInProgress) return@LaunchedEffect
        if (state.layoutInfo.visibleItemsInfo.isEmpty()) {
            state.scrollToItem(selectedIndex)
            return@LaunchedEffect
        }
        if (selectedIndex == state.wheelPosition().roundToInt()) return@LaunchedEffect
        if (reducedMotion) state.scrollToItem(selectedIndex) else state.animateScrollToItem(selectedIndex)
    }

    val itemStyle = Typography.xl.copy(fontFeatureSettings = "tnum")
    Box(modifier = modifier.height(WheelItemHeight * 6.75f)) {
        Layout(
            content = {
                entries.forEach { entry ->
                    Box(Modifier.padding(horizontal = itemPadding)) {
                        CompositionLocalProvider(LocalContentStyle provides itemStyle) { entry.content() }
                    }
                }
            },
        ) { measurables, constraints ->
            val width = measurables.maxOfOrNull { it.maxIntrinsicWidth(WheelItemHeight.roundToPx()) } ?: 0
            layout(width.coerceIn(constraints.minWidth, constraints.maxWidth), 0) {}
        }
        LazyColumn(
            state = state,
            flingBehavior = fling,
            contentPadding = PaddingValues(vertical = WheelItemHeight * 2.875f),
            horizontalAlignment = horizontalAlignment,
            modifier = Modifier
                .matchParentSize()
                .clip(RoundedCornerShape(Radius.lg))
                .clearAndSetSemantics {
                    if (label != null) contentDescription = label
                    if (selectedIndex >= 0) {
                        stateDescription = entries[selectedIndex].text ?: entries[selectedIndex].value
                    }
                    if (entries.isNotEmpty()) {
                        val last = entries.lastIndex
                        progressBarRangeInfo = ProgressBarRangeInfo(
                            selectedIndex.coerceAtLeast(0).toFloat(),
                            0f..last.toFloat().coerceAtLeast(1f),
                            max(0, last - 1),
                        )
                        setProgress { target ->
                            val current = selectedIndex.coerceAtLeast(0)
                            val wanted = target.roundToInt().coerceIn(0, last)
                            val index = when {
                                wanted > current -> enabledIndex(entries, wanted, 1)
                                wanted < current -> enabledIndex(entries, wanted, -1)
                                else -> -1
                            }
                            if (index >= 0) select(entries[index].value)
                            index >= 0
                        }
                    }
                },
        ) {
            itemsIndexed(entries, key = { _, entry -> entry.value }) { index, entry ->
                Box(
                    modifier = Modifier
                        .height(WheelItemHeight)
                        .fillMaxWidth()
                        .clickable(interactionSource = null, indication = null, enabled = entry.enabled) {
                            select(entry.value)
                        }
                        .padding(horizontal = itemPadding),
                    contentAlignment = Alignment.CenterStart,
                ) {
                    Box(
                        modifier = Modifier
                            .align(Alignment.Center)
                            .fillMaxWidth()
                            .wrapContentWidth(horizontalAlignment, unbounded = true)
                            .graphicsLayer {
                                val distance = index - state.wheelPosition()
                                val height = WheelItemHeight.value
                                val radius = height / RowAngle
                                val angle = (distance * RowAngle).coerceIn(-MaxAngle, MaxAngle)
                                val offset = abs(distance)
                                val tone = if (offset < 1f) 1f - offset * 0.45f else 0.55f - (offset - 1f) * 0.06f
                                val fade = min(1f, (MaxAngle - abs(angle)) / FadeAngle)
                                val depth = Perspective / (Perspective + radius - radius * cos(angle))
                                translationY = (radius * sin(angle) - distance * height) * density
                                scaleX = depth
                                scaleY = depth * cos(angle)
                                alpha = max(0f, tone * fade)
                            },
                    ) {
                        CompositionLocalProvider(
                            LocalContentStyle provides itemStyle.copy(
                                color = if (entry.enabled) colors.label else colors.labelTertiary,
                            ),
                            LocalContentColor provides if (entry.enabled) colors.label else colors.labelTertiary,
                        ) {
                            entry.content()
                        }
                    }
                }
            }
        }
    }
}

private fun LazyListState.wheelPosition(): Float {
    val info = layoutInfo
    val first = info.visibleItemsInfo.firstOrNull() ?: return firstVisibleItemIndex.toFloat()
    if (first.size == 0) return first.index.toFloat()
    val center = (info.viewportStartOffset + info.viewportEndOffset) / 2f
    return first.index - (first.offset - center) / first.size - 0.5f
}

private fun enabledIndex(entries: List<WheelEntry>, from: Int, step: Int): Int {
    var index = from
    while (index >= 0 && index < entries.size) {
        if (entries[index].enabled) return index
        index += step
    }
    return -1
}

private fun nearestEnabledIndex(entries: List<WheelEntry>, from: Int): Int {
    for (distance in entries.indices) {
        if (entries.getOrNull(from - distance)?.enabled == true) return from - distance
        if (entries.getOrNull(from + distance)?.enabled == true) return from + distance
    }
    return -1
}
```

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

## Usage

```tsx
import { DatePicker } from "@/components/patterns/date-picker"
```

```tsx
<DatePicker accessibilityLabel="Date" />
```

Use it uncontrolled with `defaultValue`, or controlled with `value` and `onValueChange`. The value is a `Date` or `null`; `onValueChange` fires on every wheel change, so there is no separate confirm step.

When no value is set the wheels start at today and the field shows `placeholder`. Limit the year column with `fromYear` and `toYear`.

## Examples

### With value

Starts with a preset date via `defaultValue`.

![Preview](https://uim.suiss.app/previews/patterns-date-picker--with-value.light.webp)

```tsx
import { DatePicker } from "@/components/patterns/date-picker"

export function DatePickerWithValueExample() {
  return (
    <DatePicker accessibilityLabel="Date" defaultValue={new Date(2026, 9, 4)} />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct DatePickerWithValueExample: View {
  var body: some View {
    DatePickerDemo(value: datePickerDay(2026, 10, 4))
  }
}

func datePickerDay(_ year: Int, _ month: Int, _ day: Int) -> Date? {
  Foundation.Calendar.current.date(from: DateComponents(year: year, month: month, day: day))
}

struct DatePickerDemo: View {
  var placeholder: LocalizedStringKey = "Pick a date"
  var fromYear: Int?
  var toYear: Int?
  var title: LocalizedStringKey?
  var showCloseButton = false
  var closeLabel: LocalizedStringKey?

  @State private var value: Date?

  init(
    value: Date? = nil,
    placeholder: LocalizedStringKey = "Pick a date",
    fromYear: Int? = nil,
    toYear: Int? = nil,
    title: LocalizedStringKey? = nil,
    showCloseButton: Bool = false,
    closeLabel: LocalizedStringKey? = nil
  ) {
    _value = State(initialValue: value)
    self.placeholder = placeholder
    self.fromYear = fromYear
    self.toYear = toYear
    self.title = title
    self.showCloseButton = showCloseButton
    self.closeLabel = closeLabel
  }

  var body: some View {
    DatePickerField(
      selection: $value,
      placeholder: placeholder,
      fromYear: fromYear,
      toYear: toYear,
      title: title,
      showCloseButton: showCloseButton,
      closeLabel: closeLabel
    )
    .fixedSize()
    .accessibilityLabel(Text("Date"))
  }
}
```

```kotlin
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import com.esuiss.ui.patterns.DatePicker
import java.util.Calendar
import java.util.Date
import java.util.Locale

@Composable
fun DatePickerWithValueExample() {
    DatePickerDemo(initial = datePickerDate(2026, 9, 4))
}

fun datePickerDate(year: Int, month: Int, day: Int): Long =
    Calendar.getInstance().apply {
        clear()
        set(year, month, day)
    }.timeInMillis

@Composable
fun DatePickerDemo(
    initial: Long? = null,
    locale: Locale = Locale.getDefault(),
    placeholder: String = "Pick a date",
    fromYear: Int = Calendar.getInstance().get(Calendar.YEAR) - 100,
    toYear: Int = Calendar.getInstance().get(Calendar.YEAR) + 10,
    title: String? = null,
    enabled: Boolean = true,
    invalid: Boolean? = null,
    floating: Boolean = false,
    showCloseButton: Boolean = false,
    closeLabel: String? = null,
) {
    var value by rememberSaveable { mutableStateOf(initial) }
    DatePicker(
        value = value?.let(::Date),
        onValueChange = { value = it.time },
        modifier = Modifier.semantics { contentDescription = "Date" },
        placeholder = placeholder,
        locale = locale,
        fromYear = fromYear,
        toYear = toYear,
        title = title,
        enabled = enabled,
        invalid = invalid,
        floating = floating,
        showCloseButton = showCloseButton,
        closeLabel = closeLabel,
    )
}
```

### Locale

Uses `tr-TR`, which reorders the wheels and translates month names.

![Preview](https://uim.suiss.app/previews/patterns-date-picker--locale.light.webp)

```tsx
import { DatePicker } from "@/components/patterns/date-picker"

export function DatePickerLocaleExample() {
  return (
    <DatePicker accessibilityLabel="Date" locale="tr-TR" placeholder="Tarih seç" defaultValue={new Date(2026, 9, 4)} />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct DatePickerLocaleExample: View {
  var body: some View {
    DatePickerDemo(value: datePickerDay(2026, 10, 4), placeholder: "Tarih seç")
      .environment(\.locale, Locale(identifier: "tr_TR"))
  }
}

func datePickerDay(_ year: Int, _ month: Int, _ day: Int) -> Date? {
  Foundation.Calendar.current.date(from: DateComponents(year: year, month: month, day: day))
}

struct DatePickerDemo: View {
  var placeholder: LocalizedStringKey = "Pick a date"
  var fromYear: Int?
  var toYear: Int?
  var title: LocalizedStringKey?
  var showCloseButton = false
  var closeLabel: LocalizedStringKey?

  @State private var value: Date?

  init(
    value: Date? = nil,
    placeholder: LocalizedStringKey = "Pick a date",
    fromYear: Int? = nil,
    toYear: Int? = nil,
    title: LocalizedStringKey? = nil,
    showCloseButton: Bool = false,
    closeLabel: LocalizedStringKey? = nil
  ) {
    _value = State(initialValue: value)
    self.placeholder = placeholder
    self.fromYear = fromYear
    self.toYear = toYear
    self.title = title
    self.showCloseButton = showCloseButton
    self.closeLabel = closeLabel
  }

  var body: some View {
    DatePickerField(
      selection: $value,
      placeholder: placeholder,
      fromYear: fromYear,
      toYear: toYear,
      title: title,
      showCloseButton: showCloseButton,
      closeLabel: closeLabel
    )
    .fixedSize()
    .accessibilityLabel(Text("Date"))
  }
}
```

```kotlin
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import com.esuiss.ui.patterns.DatePicker
import java.util.Calendar
import java.util.Date
import java.util.Locale

@Composable
fun DatePickerLocaleExample() {
    DatePickerDemo(
        initial = datePickerDate(2026, 9, 4),
        locale = Locale.forLanguageTag("tr-TR"),
        placeholder = "Tarih seç",
    )
}

fun datePickerDate(year: Int, month: Int, day: Int): Long =
    Calendar.getInstance().apply {
        clear()
        set(year, month, day)
    }.timeInMillis

@Composable
fun DatePickerDemo(
    initial: Long? = null,
    locale: Locale = Locale.getDefault(),
    placeholder: String = "Pick a date",
    fromYear: Int = Calendar.getInstance().get(Calendar.YEAR) - 100,
    toYear: Int = Calendar.getInstance().get(Calendar.YEAR) + 10,
    title: String? = null,
    enabled: Boolean = true,
    invalid: Boolean? = null,
    floating: Boolean = false,
    showCloseButton: Boolean = false,
    closeLabel: String? = null,
) {
    var value by rememberSaveable { mutableStateOf(initial) }
    DatePicker(
        value = value?.let(::Date),
        onValueChange = { value = it.time },
        modifier = Modifier.semantics { contentDescription = "Date" },
        placeholder = placeholder,
        locale = locale,
        fromYear = fromYear,
        toYear = toYear,
        title = title,
        enabled = enabled,
        invalid = invalid,
        floating = floating,
        showCloseButton = showCloseButton,
        closeLabel = closeLabel,
    )
}
```

### Year range

A date-of-birth field limited to 1940 through 2010.

![Preview](https://uim.suiss.app/previews/patterns-date-picker--year-range.light.webp)

```tsx
import { DatePicker } from "@/components/patterns/date-picker"

export function DatePickerYearRangeExample() {
  return (
    <DatePicker accessibilityLabel="Date" placeholder="Date of birth" fromYear={1940} toYear={2010} defaultValue={new Date(1990, 5, 15)} />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct DatePickerYearRangeExample: View {
  var body: some View {
    DatePickerDemo(value: datePickerDay(1990, 6, 15), placeholder: "Date of birth", fromYear: 1940, toYear: 2010)
  }
}

func datePickerDay(_ year: Int, _ month: Int, _ day: Int) -> Date? {
  Foundation.Calendar.current.date(from: DateComponents(year: year, month: month, day: day))
}

struct DatePickerDemo: View {
  var placeholder: LocalizedStringKey = "Pick a date"
  var fromYear: Int?
  var toYear: Int?
  var title: LocalizedStringKey?
  var showCloseButton = false
  var closeLabel: LocalizedStringKey?

  @State private var value: Date?

  init(
    value: Date? = nil,
    placeholder: LocalizedStringKey = "Pick a date",
    fromYear: Int? = nil,
    toYear: Int? = nil,
    title: LocalizedStringKey? = nil,
    showCloseButton: Bool = false,
    closeLabel: LocalizedStringKey? = nil
  ) {
    _value = State(initialValue: value)
    self.placeholder = placeholder
    self.fromYear = fromYear
    self.toYear = toYear
    self.title = title
    self.showCloseButton = showCloseButton
    self.closeLabel = closeLabel
  }

  var body: some View {
    DatePickerField(
      selection: $value,
      placeholder: placeholder,
      fromYear: fromYear,
      toYear: toYear,
      title: title,
      showCloseButton: showCloseButton,
      closeLabel: closeLabel
    )
    .fixedSize()
    .accessibilityLabel(Text("Date"))
  }
}
```

```kotlin
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import com.esuiss.ui.patterns.DatePicker
import java.util.Calendar
import java.util.Date
import java.util.Locale

@Composable
fun DatePickerYearRangeExample() {
    DatePickerDemo(
        initial = datePickerDate(1990, 5, 15),
        placeholder = "Date of birth",
        fromYear = 1940,
        toYear = 2010,
    )
}

fun datePickerDate(year: Int, month: Int, day: Int): Long =
    Calendar.getInstance().apply {
        clear()
        set(year, month, day)
    }.timeInMillis

@Composable
fun DatePickerDemo(
    initial: Long? = null,
    locale: Locale = Locale.getDefault(),
    placeholder: String = "Pick a date",
    fromYear: Int = Calendar.getInstance().get(Calendar.YEAR) - 100,
    toYear: Int = Calendar.getInstance().get(Calendar.YEAR) + 10,
    title: String? = null,
    enabled: Boolean = true,
    invalid: Boolean? = null,
    floating: Boolean = false,
    showCloseButton: Boolean = false,
    closeLabel: String? = null,
) {
    var value by rememberSaveable { mutableStateOf(initial) }
    DatePicker(
        value = value?.let(::Date),
        onValueChange = { value = it.time },
        modifier = Modifier.semantics { contentDescription = "Date" },
        placeholder = placeholder,
        locale = locale,
        fromYear = fromYear,
        toYear = toYear,
        title = title,
        enabled = enabled,
        invalid = invalid,
        floating = floating,
        showCloseButton = showCloseButton,
        closeLabel = closeLabel,
    )
}
```

### With title

Adds a heading to the drawer with `title`.

![Preview](https://uim.suiss.app/previews/patterns-date-picker--with-title.light.webp)

```tsx
import { DatePicker } from "@/components/patterns/date-picker"

export function DatePickerWithTitleExample() {
  return (
    <DatePicker accessibilityLabel="Date" title="Delivery date" />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct DatePickerWithTitleExample: View {
  var body: some View {
    DatePickerDemo(title: "Delivery date")
  }
}

struct DatePickerDemo: View {
  var placeholder: LocalizedStringKey = "Pick a date"
  var fromYear: Int?
  var toYear: Int?
  var title: LocalizedStringKey?
  var showCloseButton = false
  var closeLabel: LocalizedStringKey?

  @State private var value: Date?

  init(
    value: Date? = nil,
    placeholder: LocalizedStringKey = "Pick a date",
    fromYear: Int? = nil,
    toYear: Int? = nil,
    title: LocalizedStringKey? = nil,
    showCloseButton: Bool = false,
    closeLabel: LocalizedStringKey? = nil
  ) {
    _value = State(initialValue: value)
    self.placeholder = placeholder
    self.fromYear = fromYear
    self.toYear = toYear
    self.title = title
    self.showCloseButton = showCloseButton
    self.closeLabel = closeLabel
  }

  var body: some View {
    DatePickerField(
      selection: $value,
      placeholder: placeholder,
      fromYear: fromYear,
      toYear: toYear,
      title: title,
      showCloseButton: showCloseButton,
      closeLabel: closeLabel
    )
    .fixedSize()
    .accessibilityLabel(Text("Date"))
  }
}
```

```kotlin
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import com.esuiss.ui.patterns.DatePicker
import java.util.Calendar
import java.util.Date
import java.util.Locale

@Composable
fun DatePickerWithTitleExample() {
    DatePickerDemo(title = "Delivery date")
}

@Composable
fun DatePickerDemo(
    initial: Long? = null,
    locale: Locale = Locale.getDefault(),
    placeholder: String = "Pick a date",
    fromYear: Int = Calendar.getInstance().get(Calendar.YEAR) - 100,
    toYear: Int = Calendar.getInstance().get(Calendar.YEAR) + 10,
    title: String? = null,
    enabled: Boolean = true,
    invalid: Boolean? = null,
    floating: Boolean = false,
    showCloseButton: Boolean = false,
    closeLabel: String? = null,
) {
    var value by rememberSaveable { mutableStateOf(initial) }
    DatePicker(
        value = value?.let(::Date),
        onValueChange = { value = it.time },
        modifier = Modifier.semantics { contentDescription = "Date" },
        placeholder = placeholder,
        locale = locale,
        fromYear = fromYear,
        toYear = toYear,
        title = title,
        enabled = enabled,
        invalid = invalid,
        floating = floating,
        showCloseButton = showCloseButton,
        closeLabel = closeLabel,
    )
}
```

### With close button

Shows a close button in the drawer.

![Preview](https://uim.suiss.app/previews/patterns-date-picker--with-close-button.light.webp)

```tsx
import { DatePicker } from "@/components/patterns/date-picker"

export function DatePickerWithCloseButtonExample() {
  return (
    <DatePicker accessibilityLabel="Date" showCloseButton />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct DatePickerWithCloseButtonExample: View {
  var body: some View {
    DatePickerDemo(showCloseButton: true)
  }
}

struct DatePickerDemo: View {
  var placeholder: LocalizedStringKey = "Pick a date"
  var fromYear: Int?
  var toYear: Int?
  var title: LocalizedStringKey?
  var showCloseButton = false
  var closeLabel: LocalizedStringKey?

  @State private var value: Date?

  init(
    value: Date? = nil,
    placeholder: LocalizedStringKey = "Pick a date",
    fromYear: Int? = nil,
    toYear: Int? = nil,
    title: LocalizedStringKey? = nil,
    showCloseButton: Bool = false,
    closeLabel: LocalizedStringKey? = nil
  ) {
    _value = State(initialValue: value)
    self.placeholder = placeholder
    self.fromYear = fromYear
    self.toYear = toYear
    self.title = title
    self.showCloseButton = showCloseButton
    self.closeLabel = closeLabel
  }

  var body: some View {
    DatePickerField(
      selection: $value,
      placeholder: placeholder,
      fromYear: fromYear,
      toYear: toYear,
      title: title,
      showCloseButton: showCloseButton,
      closeLabel: closeLabel
    )
    .fixedSize()
    .accessibilityLabel(Text("Date"))
  }
}
```

```kotlin
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import com.esuiss.ui.patterns.DatePicker
import java.util.Calendar
import java.util.Date
import java.util.Locale

@Composable
fun DatePickerWithCloseButtonExample() {
    DatePickerDemo(showCloseButton = true)
}

@Composable
fun DatePickerDemo(
    initial: Long? = null,
    locale: Locale = Locale.getDefault(),
    placeholder: String = "Pick a date",
    fromYear: Int = Calendar.getInstance().get(Calendar.YEAR) - 100,
    toYear: Int = Calendar.getInstance().get(Calendar.YEAR) + 10,
    title: String? = null,
    enabled: Boolean = true,
    invalid: Boolean? = null,
    floating: Boolean = false,
    showCloseButton: Boolean = false,
    closeLabel: String? = null,
) {
    var value by rememberSaveable { mutableStateOf(initial) }
    DatePicker(
        value = value?.let(::Date),
        onValueChange = { value = it.time },
        modifier = Modifier.semantics { contentDescription = "Date" },
        placeholder = placeholder,
        locale = locale,
        fromYear = fromYear,
        toYear = toYear,
        title = title,
        enabled = enabled,
        invalid = invalid,
        floating = floating,
        showCloseButton = showCloseButton,
        closeLabel = closeLabel,
    )
}
```

### With close label

Labels the close button `Done` with `closeLabel`.

![Preview](https://uim.suiss.app/previews/patterns-date-picker--with-close-label.light.webp)

```tsx
import { DatePicker } from "@/components/patterns/date-picker"

export function DatePickerWithCloseLabelExample() {
  return (
    <DatePicker accessibilityLabel="Date" showCloseButton closeLabel="Done" />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct DatePickerWithCloseLabelExample: View {
  var body: some View {
    DatePickerDemo(showCloseButton: true, closeLabel: "Done")
  }
}

struct DatePickerDemo: View {
  var placeholder: LocalizedStringKey = "Pick a date"
  var fromYear: Int?
  var toYear: Int?
  var title: LocalizedStringKey?
  var showCloseButton = false
  var closeLabel: LocalizedStringKey?

  @State private var value: Date?

  init(
    value: Date? = nil,
    placeholder: LocalizedStringKey = "Pick a date",
    fromYear: Int? = nil,
    toYear: Int? = nil,
    title: LocalizedStringKey? = nil,
    showCloseButton: Bool = false,
    closeLabel: LocalizedStringKey? = nil
  ) {
    _value = State(initialValue: value)
    self.placeholder = placeholder
    self.fromYear = fromYear
    self.toYear = toYear
    self.title = title
    self.showCloseButton = showCloseButton
    self.closeLabel = closeLabel
  }

  var body: some View {
    DatePickerField(
      selection: $value,
      placeholder: placeholder,
      fromYear: fromYear,
      toYear: toYear,
      title: title,
      showCloseButton: showCloseButton,
      closeLabel: closeLabel
    )
    .fixedSize()
    .accessibilityLabel(Text("Date"))
  }
}
```

```kotlin
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import com.esuiss.ui.patterns.DatePicker
import java.util.Calendar
import java.util.Date
import java.util.Locale

@Composable
fun DatePickerWithCloseLabelExample() {
    DatePickerDemo(showCloseButton = true, closeLabel = "Done")
}

@Composable
fun DatePickerDemo(
    initial: Long? = null,
    locale: Locale = Locale.getDefault(),
    placeholder: String = "Pick a date",
    fromYear: Int = Calendar.getInstance().get(Calendar.YEAR) - 100,
    toYear: Int = Calendar.getInstance().get(Calendar.YEAR) + 10,
    title: String? = null,
    enabled: Boolean = true,
    invalid: Boolean? = null,
    floating: Boolean = false,
    showCloseButton: Boolean = false,
    closeLabel: String? = null,
) {
    var value by rememberSaveable { mutableStateOf(initial) }
    DatePicker(
        value = value?.let(::Date),
        onValueChange = { value = it.time },
        modifier = Modifier.semantics { contentDescription = "Date" },
        placeholder = placeholder,
        locale = locale,
        fromYear = fromYear,
        toYear = toYear,
        title = title,
        enabled = enabled,
        invalid = invalid,
        floating = floating,
        showCloseButton = showCloseButton,
        closeLabel = closeLabel,
    )
}
```

### Disabled

A disabled field that cannot open the drawer.

![Preview](https://uim.suiss.app/previews/patterns-date-picker--disabled.light.webp)

```tsx
import { DatePicker } from "@/components/patterns/date-picker"

export function DatePickerDisabledExample() {
  return (
    <DatePicker accessibilityLabel="Date" disabled />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct DatePickerDisabledExample: View {
  var body: some View {
    DatePickerDemo()
      .disabled(true)
  }
}

struct DatePickerDemo: View {
  var placeholder: LocalizedStringKey = "Pick a date"
  var fromYear: Int?
  var toYear: Int?
  var title: LocalizedStringKey?
  var showCloseButton = false
  var closeLabel: LocalizedStringKey?

  @State private var value: Date?

  init(
    value: Date? = nil,
    placeholder: LocalizedStringKey = "Pick a date",
    fromYear: Int? = nil,
    toYear: Int? = nil,
    title: LocalizedStringKey? = nil,
    showCloseButton: Bool = false,
    closeLabel: LocalizedStringKey? = nil
  ) {
    _value = State(initialValue: value)
    self.placeholder = placeholder
    self.fromYear = fromYear
    self.toYear = toYear
    self.title = title
    self.showCloseButton = showCloseButton
    self.closeLabel = closeLabel
  }

  var body: some View {
    DatePickerField(
      selection: $value,
      placeholder: placeholder,
      fromYear: fromYear,
      toYear: toYear,
      title: title,
      showCloseButton: showCloseButton,
      closeLabel: closeLabel
    )
    .fixedSize()
    .accessibilityLabel(Text("Date"))
  }
}
```

```kotlin
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import com.esuiss.ui.patterns.DatePicker
import java.util.Calendar
import java.util.Date
import java.util.Locale

@Composable
fun DatePickerDisabledExample() {
    DatePickerDemo(enabled = false)
}

@Composable
fun DatePickerDemo(
    initial: Long? = null,
    locale: Locale = Locale.getDefault(),
    placeholder: String = "Pick a date",
    fromYear: Int = Calendar.getInstance().get(Calendar.YEAR) - 100,
    toYear: Int = Calendar.getInstance().get(Calendar.YEAR) + 10,
    title: String? = null,
    enabled: Boolean = true,
    invalid: Boolean? = null,
    floating: Boolean = false,
    showCloseButton: Boolean = false,
    closeLabel: String? = null,
) {
    var value by rememberSaveable { mutableStateOf(initial) }
    DatePicker(
        value = value?.let(::Date),
        onValueChange = { value = it.time },
        modifier = Modifier.semantics { contentDescription = "Date" },
        placeholder = placeholder,
        locale = locale,
        fromYear = fromYear,
        toYear = toYear,
        title = title,
        enabled = enabled,
        invalid = invalid,
        floating = floating,
        showCloseButton = showCloseButton,
        closeLabel = closeLabel,
    )
}
```

### Invalid

Shows the error border and tint with `invalid`.

![Preview](https://uim.suiss.app/previews/patterns-date-picker--invalid.light.webp)

```tsx
import { DatePicker } from "@/components/patterns/date-picker"

export function DatePickerInvalidExample() {
  return (
    <DatePicker accessibilityLabel="Date" invalid />
  )
}
```

```swift
import EsuissUI
import SwiftUI

struct DatePickerInvalidExample: View {
  var body: some View {
    DatePickerDemo()
      .invalid()
  }
}

struct DatePickerDemo: View {
  var placeholder: LocalizedStringKey = "Pick a date"
  var fromYear: Int?
  var toYear: Int?
  var title: LocalizedStringKey?
  var showCloseButton = false
  var closeLabel: LocalizedStringKey?

  @State private var value: Date?

  init(
    value: Date? = nil,
    placeholder: LocalizedStringKey = "Pick a date",
    fromYear: Int? = nil,
    toYear: Int? = nil,
    title: LocalizedStringKey? = nil,
    showCloseButton: Bool = false,
    closeLabel: LocalizedStringKey? = nil
  ) {
    _value = State(initialValue: value)
    self.placeholder = placeholder
    self.fromYear = fromYear
    self.toYear = toYear
    self.title = title
    self.showCloseButton = showCloseButton
    self.closeLabel = closeLabel
  }

  var body: some View {
    DatePickerField(
      selection: $value,
      placeholder: placeholder,
      fromYear: fromYear,
      toYear: toYear,
      title: title,
      showCloseButton: showCloseButton,
      closeLabel: closeLabel
    )
    .fixedSize()
    .accessibilityLabel(Text("Date"))
  }
}
```

```kotlin
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import com.esuiss.ui.patterns.DatePicker
import java.util.Calendar
import java.util.Date
import java.util.Locale

@Composable
fun DatePickerInvalidExample() {
    DatePickerDemo(invalid = true)
}

@Composable
fun DatePickerDemo(
    initial: Long? = null,
    locale: Locale = Locale.getDefault(),
    placeholder: String = "Pick a date",
    fromYear: Int = Calendar.getInstance().get(Calendar.YEAR) - 100,
    toYear: Int = Calendar.getInstance().get(Calendar.YEAR) + 10,
    title: String? = null,
    enabled: Boolean = true,
    invalid: Boolean? = null,
    floating: Boolean = false,
    showCloseButton: Boolean = false,
    closeLabel: String? = null,
) {
    var value by rememberSaveable { mutableStateOf(initial) }
    DatePicker(
        value = value?.let(::Date),
        onValueChange = { value = it.time },
        modifier = Modifier.semantics { contentDescription = "Date" },
        placeholder = placeholder,
        locale = locale,
        fromYear = fromYear,
        toYear = toYear,
        title = title,
        enabled = enabled,
        invalid = invalid,
        floating = floating,
        showCloseButton = showCloseButton,
        closeLabel = closeLabel,
    )
}
```

### Controlled

Holds the date in state and prints the selection below.

![Preview](https://uim.suiss.app/previews/patterns-date-picker--controlled.light.webp)

```tsx
import * as React from "react"
import { View } from "react-native"
import { DatePicker } from "@/components/patterns/date-picker"
import { Text } from "@/components/ui/text"

function ControlledExample(args: React.ComponentProps<typeof DatePicker>) {
  const [value, setValue] = React.useState<Date | null>(new Date(2026, 9, 4))

  return (
    <View className="items-start gap-2">
      <DatePicker {...args} value={value} onValueChange={setValue} />
      <Text className="text-sm text-label-secondary">
        Selected: {value ? value.toDateString() : "none"}
      </Text>
    </View>
  )
}

export function DatePickerControlledExample() {
  return (
    <ControlledExample accessibilityLabel="Date" />
  )
}
```

```swift
import EsuissUI
import SwiftUI

func datePickerDay(_ year: Int, _ month: Int, _ day: Int) -> Date? {
  Foundation.Calendar.current.date(from: DateComponents(year: year, month: month, day: day))
}

struct DatePickerControlled: View {
  @State private var value: Date? = datePickerDay(2026, 10, 4)

  var selected: String {
    guard let value else { return "none" }
    let formatter = DateFormatter()
    formatter.locale = Locale(identifier: "en_US_POSIX")
    formatter.dateFormat = "EEE MMM dd yyyy"
    return formatter.string(from: value)
  }

  var body: some View {
    VStack(alignment: .leading, spacing: 8) {
      DatePickerField(selection: $value)
        .fixedSize()
        .accessibilityLabel(Text("Date"))
      Text(verbatim: "Selected: \(selected)")
        .textStyle(.sm)
        .foregroundStyle(Color.labelSecondary)
    }
  }
}
```

```kotlin
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import androidx.compose.ui.unit.dp
import com.esuiss.ui.components.Text
import com.esuiss.ui.patterns.DatePicker
import com.esuiss.ui.theme.EsuissTheme
import com.esuiss.ui.theme.Typography
import java.text.SimpleDateFormat
import java.util.Calendar
import java.util.Date
import java.util.Locale

fun datePickerDate(year: Int, month: Int, day: Int): Long =
    Calendar.getInstance().apply {
        clear()
        set(year, month, day)
    }.timeInMillis

@Composable
fun DatePickerControlled() {
    var value by rememberSaveable { mutableStateOf<Long?>(datePickerDate(2026, 9, 4)) }
    val format = SimpleDateFormat("EEE MMM dd yyyy", Locale.US)
    Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
        DatePicker(
            value = value?.let(::Date),
            onValueChange = { value = it.time },
            modifier = Modifier.semantics { contentDescription = "Date" },
        )
        Text(
            "Selected: ${value?.let { format.format(Date(it)) } ?: "none"}",
            style = Typography.sm.copy(color = EsuissTheme.colors.labelSecondary),
        )
    }
}
```

### Floating

Detaches the drawer from the screen edges.

![Preview](https://uim.suiss.app/previews/patterns-date-picker--floating.light.webp)

```tsx
import { DatePicker } from "@/components/patterns/date-picker"

export function DatePickerFloatingExample() {
  return (
    <DatePicker accessibilityLabel="Date" floating />
  )
}
```

```kotlin
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.semantics.contentDescription
import androidx.compose.ui.semantics.semantics
import com.esuiss.ui.patterns.DatePicker
import java.util.Calendar
import java.util.Date
import java.util.Locale

@Composable
fun DatePickerFloatingExample() {
    DatePickerDemo(floating = true)
}

@Composable
fun DatePickerDemo(
    initial: Long? = null,
    locale: Locale = Locale.getDefault(),
    placeholder: String = "Pick a date",
    fromYear: Int = Calendar.getInstance().get(Calendar.YEAR) - 100,
    toYear: Int = Calendar.getInstance().get(Calendar.YEAR) + 10,
    title: String? = null,
    enabled: Boolean = true,
    invalid: Boolean? = null,
    floating: Boolean = false,
    showCloseButton: Boolean = false,
    closeLabel: String? = null,
) {
    var value by rememberSaveable { mutableStateOf(initial) }
    DatePicker(
        value = value?.let(::Date),
        onValueChange = { value = it.time },
        modifier = Modifier.semantics { contentDescription = "Date" },
        placeholder = placeholder,
        locale = locale,
        fromYear = fromYear,
        toYear = toYear,
        title = title,
        enabled = enabled,
        invalid = invalid,
        floating = floating,
        showCloseButton = showCloseButton,
        closeLabel = closeLabel,
    )
}
```

## API Reference

### DatePicker

## Accessibility

- The wheels are labelled `Day`, `Month` and `Year`.
- Without a `title`, the drawer is labelled by `accessibilityLabel` or the placeholder.

## Notes

- The field uses `bg-control`, `border-danger` with a `bg-danger` tint when invalid, and `bg-control-disabled` when disabled; the tint is stronger in dark mode.
- Without `floating`, the drawer's top corners are square.