Segmented Select

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import type { KeyboardEvent, RefObject } from "react";
import { useId, useRef, useState } from "react";

export type SelectSize = "sm" | "md" | "lg";

export interface SegmentedOption {
  value: string;
  label: string;
  disabled?: boolean;
}

export interface SegmentedSelectProps {
  label?: string;
  options: SegmentedOption[];
  value?: string;
  defaultValue?: string;
  onChange?: (value: string, option: SegmentedOption) => void;
  size?: SelectSize;
  id?: string;
  name?: string;
  className?: string;
}

function cx(...parts: Array<string | false | null | undefined>): string {
  return parts.filter(Boolean).join(" ");
}

const SIZES: Record<SelectSize, string> = {
  sm: "h-8 text-[13px] [&_svg]:size-[14px]",
  md: "h-9 text-sm [&_svg]:size-4",
  lg: "h-11 text-sm [&_svg]:size-[18px]",
};

/**
 * Segmented single-select. A horizontal row of segments (buttons) where
 * exactly one is active at a time — radiogroup semantics: the wrapper carries
 * role="radiogroup" and each segment role="radio" aria-checked. Keyboard uses
 * roving tabindex: ArrowLeft/Right move between enabled segments and Tab
 * enters/exits the group (only the active segment is tabbable). The active
 * segment is bg-surface-active + font-medium + a border-strong edge; inactive
 * segments are transparent + muted. Controlled (value/onChange) + uncontrolled
 * (defaultValue). NOT a dropdown — no panel, no chevron.
 */
export function SegmentedSelect({
  label = "Segment",
  options,
  value,
  defaultValue = "",
  onChange,
  size = "md",
  id,
  name,
  className,
}: SegmentedSelectProps) {
  const generatedId = useId();
  const groupId = id ?? `segmented-select-${generatedId}`;
  const labelId = `${groupId}-label`;

  const [internalValue, setInternalValue] = useState(defaultValue);
  const selectedValue = value ?? internalValue;
  const selectedIndex = options.findIndex((o) => o.value === selectedValue);

  const refs = useRef<Array<HTMLButtonElement | null>>([]);
  const [focusedIndex, setFocusedIndex] = useState(() => {
    const sel = options.findIndex((o) => o.value === selectedValue && !o.disabled);
    if (sel >= 0) return sel;
    const enabled = options.findIndex((o) => !o.disabled);
    return enabled === -1 ? 0 : enabled;
  });

  function enabledIndex(start: number, step: number): number {
    for (let i = 0; i < options.length; i++) {
      const next = (start + step * (i + 1) + options.length) % options.length;
      if (!options[next].disabled) return next;
    }
    return start;
  }

  function choose(option: SegmentedOption) {
    if (option.disabled) return;
    if (value === undefined) setInternalValue(option.value);
    onChange?.(option.value, option);
  }

  function focusSegment(i: number) {
    setFocusedIndex(i);
    refs.current[i]?.focus();
  }

  function onKeyDown(event: KeyboardEvent<HTMLDivElement>) {
    switch (event.key) {
      case "ArrowRight":
      case "ArrowDown":
        event.preventDefault();
        focusSegment(enabledIndex(focusedIndex, 1));
        break;
      case "ArrowLeft":
      case "ArrowUp":
        event.preventDefault();
        focusSegment(enabledIndex(focusedIndex, -1));
        break;
      case "Home":
        event.preventDefault();
        for (let i = 0; i < options.length; i++) if (!options[i].disabled) { focusSegment(i); break; }
        break;
      case "End":
        event.preventDefault();
        for (let i = options.length - 1; i >= 0; i--) if (!options[i].disabled) { focusSegment(i); break; }
        break;
    }
  }

  return (
    <div className={cx("w-full", className)}>
      <span id={labelId} className="mb-2 block text-[13px] font-medium leading-5 text-[var(--ds-color-foreground)]">
        {label}
      </span>
      {name ? <input type="hidden" name={name} value={selectedValue} readOnly /> : null}
      <div
        role="radiogroup"
        aria-labelledby={labelId}
        onKeyDown={onKeyDown}
        className={cx(
          "inline-flex w-full items-stretch gap-1 rounded-[var(--ds-radius-sm)] border border-[var(--ds-color-border)] bg-[var(--ds-color-surface-subtle)] p-1",
          SIZES[size],
        )}
      >
        {options.map((option, i) => {
          const isActive = i === selectedIndex;
          const isFocused = i === focusedIndex;
          const tabbable = isFocused && !option.disabled || (focusedIndex < 0 && i === 0 && !option.disabled);
          return (
            <button
              key={option.value}
              ref={(el) => { refs.current[i] = el; }}
              type="button"
              role="radio"
              aria-checked={isActive}
              aria-disabled={option.disabled || undefined}
              disabled={option.disabled}
              tabIndex={tabbable ? 0 : -1}
              onClick={() => {
                choose(option);
                setFocusedIndex(i);
              }}
              onFocus={() => setFocusedIndex(i)}
              className={cx(
                "flex flex-1 items-center justify-center gap-1.5 rounded-[var(--ds-radius-xs)] px-3 text-center transition-colors duration-150 ease-out focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[var(--ds-color-focus-ring)] motion-reduce:transition-none",
                isActive
                  ? "border border-[var(--ds-color-border-strong)] bg-[var(--ds-color-surface-active)] font-medium text-[var(--ds-color-foreground)] shadow-[var(--ds-shadow-xs)]"
                  : "border border-transparent bg-transparent text-[var(--ds-color-muted-foreground)] hover:bg-[var(--ds-color-surface-hover)] hover:text-[var(--ds-color-foreground)]",
                option.disabled && !isActive ? "cursor-not-allowed opacity-50" : "",
                option.disabled && isActive ? "opacity-70" : "",
              )}
            >
              <span className="truncate">{option.label}</span>
            </button>
          );
        })}
      </div>
    </div>
  );
}

export default SegmentedSelect;

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/* DevSnips React — JavaScript parity build.
 * Same API, behavior, and classes as code.tsx; TypeScript types removed.
 * Regenerated from code.tsx — edit code.tsx and re-run the generator.
 */

import { useId, useRef, useState } from "react";
function cx(...parts) {
  return parts.filter(Boolean).join(" ");
}
const SIZES = {
  sm: "h-8 text-[13px] [&_svg]:size-[14px]",
  md: "h-9 text-sm [&_svg]:size-4",
  lg: "h-11 text-sm [&_svg]:size-[18px]"
};
export function SegmentedSelect({
  label = "Segment",
  options,
  value,
  defaultValue = "",
  onChange,
  size = "md",
  id,
  name,
  className
}) {
  const generatedId = useId();
  const groupId = id ?? `segmented-select-${generatedId}`;
  const labelId = `${groupId}-label`;
  const [internalValue, setInternalValue] = useState(defaultValue);
  const selectedValue = value ?? internalValue;
  const selectedIndex = options.findIndex((o) => o.value === selectedValue);
  const refs = useRef([]);
  const [focusedIndex, setFocusedIndex] = useState(() => {
    const sel = options.findIndex((o) => o.value === selectedValue && !o.disabled);
    if (sel >= 0) return sel;
    const enabled = options.findIndex((o) => !o.disabled);
    return enabled === -1 ? 0 : enabled;
  });
  function enabledIndex(start, step) {
    for (let i = 0; i < options.length; i++) {
      const next = (start + step * (i + 1) + options.length) % options.length;
      if (!options[next].disabled) return next;
    }
    return start;
  }
  function choose(option) {
    if (option.disabled) return;
    if (value === undefined) setInternalValue(option.value);
    onChange?.(option.value, option);
  }
  function focusSegment(i) {
    setFocusedIndex(i);
    refs.current[i]?.focus();
  }
  function onKeyDown(event) {
    switch (event.key) {
      case "ArrowRight":
      case "ArrowDown":
        event.preventDefault();
        focusSegment(enabledIndex(focusedIndex, 1));
        break;
      case "ArrowLeft":
      case "ArrowUp":
        event.preventDefault();
        focusSegment(enabledIndex(focusedIndex, -1));
        break;
      case "Home":
        event.preventDefault();
        for (let i = 0; i < options.length; i++) if (!options[i].disabled) {
          focusSegment(i);
          break;
        }
        break;
      case "End":
        event.preventDefault();
        for (let i = options.length - 1; i >= 0; i--) if (!options[i].disabled) {
          focusSegment(i);
          break;
        }
        break;
    }
  }
  return <div className={cx("w-full", className)}>
      <span id={labelId} className="mb-2 block text-[13px] font-medium leading-5 text-[var(--ds-color-foreground)]">
        {label}
      </span>
      {name ? <input type="hidden" name={name} value={selectedValue} readOnly /> : null}
      <div
    role="radiogroup"
    aria-labelledby={labelId}
    onKeyDown={onKeyDown}
    className={cx(
      "inline-flex w-full items-stretch gap-1 rounded-[var(--ds-radius-sm)] border border-[var(--ds-color-border)] bg-[var(--ds-color-surface-subtle)] p-1",
      SIZES[size]
    )}
  >
        {options.map((option, i) => {
    const isActive = i === selectedIndex;
    const isFocused = i === focusedIndex;
    const tabbable = isFocused && !option.disabled || focusedIndex < 0 && i === 0 && !option.disabled;
    return <button
      key={option.value}
      ref={(el) => {
        refs.current[i] = el;
      }}
      type="button"
      role="radio"
      aria-checked={isActive}
      aria-disabled={option.disabled || undefined}
      disabled={option.disabled}
      tabIndex={tabbable ? 0 : -1}
      onClick={() => {
        choose(option);
        setFocusedIndex(i);
      }}
      onFocus={() => setFocusedIndex(i)}
      className={cx(
        "flex flex-1 items-center justify-center gap-1.5 rounded-[var(--ds-radius-xs)] px-3 text-center transition-colors duration-150 ease-out focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[var(--ds-color-focus-ring)] motion-reduce:transition-none",
        isActive ? "border border-[var(--ds-color-border-strong)] bg-[var(--ds-color-surface-active)] font-medium text-[var(--ds-color-foreground)] shadow-[var(--ds-shadow-xs)]" : "border border-transparent bg-transparent text-[var(--ds-color-muted-foreground)] hover:bg-[var(--ds-color-surface-hover)] hover:text-[var(--ds-color-foreground)]",
        option.disabled && !isActive ? "cursor-not-allowed opacity-50" : "",
        option.disabled && isActive ? "opacity-70" : ""
      )}
    >
              <span className="truncate">{option.label}</span>
            </button>;
  })}
      </div>
    </div>;
}

export default SegmentedSelect;

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# Segmented Select

Horizontal segmented selector with radiogroup semantics.

## Usage

```tsx
import { SegmentedSelect } from './code';

<SegmentedSelect label="View" options={[{value:"list",label:"List"},{value:"grid",label:"Grid"}]} defaultValue="list" />
```

## JavaScript

A `code.jsx` build is provided for projects that ship plain JSX. It exposes the same API and behavior as `code.tsx` — only the TypeScript types are removed.

```jsx
import { SegmentedSelect } from './code';

<SegmentedSelect label="View" options={[{value:"list",label:"List"},{value:"grid",label:"Grid"}]} defaultValue="list" />
```

## Props

| Name | Type | Default | Description |
|---|---|---:|---|
| `options` | `{value,label,disabled?}[]` | — | Segments. |
| `value` / `defaultValue` / `onChange` / `size` / `label` | — | — | Standard. |

## Behavior

A row of segments where exactly one is active. NOT a dropdown — a horizontal segmented control. Keyboard: ArrowLeft/Right/Up/Down moves between segments (roving tabindex), Home/End jump, Tab enters/exits the group. Active segment = `surface-active` + `font-medium` + border emphasis.

## Accessibility

`role="radiogroup"` wrapper; each segment `role="radio" aria-checked` with roving tabindex.

## Styling

Built with React, Tailwind CSS, and DevSnips design tokens. The component consumes the `--ds-*` semantic tokens via arbitrary values (for example `bg-[var(--ds-color-input)]`). Define the tokens once in your theme — no component-specific CSS file is required.

## Design Tokens

See [React/DESIGN_TOKENS.md](../../../DESIGN_TOKENS.md) for the authoritative token specification. This select uses the semantic color, radius, spacing, and motion tokens.

## Notes

Use for a small, mutually-exclusive option set where all choices should be visible at once.