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createCollection,
findTypeaheadMatch,
type CollectionItem,
} from '../collections/collection';
import { createRuntimeId } from '../accessibility/ids';
import { createControllerHost } from '../core/host';
import { createTimeoutManager } from '../core/timers';
import type {
ChangeDetails,
ControllableValueOptions,
RuntimeController,
RuntimeEventSource,
} from '../core/types';
import { createControllableValue } from '../state/controllable';
/** Listbox selection mode. @public */
export type ListboxSelectionMode = 'single' | 'multiple';
/** Causes of listbox selection changes. @public */
export type ListboxChangeReason = 'programmatic' | 'pointer' | 'keyboard' | 'typeahead';
/** Dynamic Listbox option registration. @public */
export interface ListboxOption extends CollectionItem {
/** Consumer value; defaults to the stable option ID. */
readonly value?: string;
}
/** Immutable per-option semantic metadata. @public */
export interface ListboxOptionSnapshot {
/** Stable option ID. */
readonly id: string;
/** Consumer selection value. */
readonly value: string;
/** Human-readable typeahead text. */
readonly text: string;
/** Value for `aria-selected`. */
readonly selected: boolean;
/** Value for `aria-disabled`. */
readonly disabled: boolean;
/** Option role for consumer markup. */
readonly role: 'option';
}
/** Immutable Listbox snapshot. @public */
export interface ListboxSnapshot {
/** Stable listbox ID used by `aria-controls`. */
readonly id: string;
/** Listbox role for consumer markup. */
readonly role: 'listbox';
/** Whether multiple values may be selected. */
readonly ariaMultiselectable: boolean;
/** ID exposed through `aria-activedescendant`. */
readonly activeId: string | null;
/** Ordered selected consumer values. */
readonly selectedValues: readonly string[];
/** Whether selection is consumer-owned. */
readonly controlled: boolean;
/** Ordered option semantics. */
readonly options: readonly ListboxOptionSnapshot[];
}
/** Listbox selection lifecycle payload. @public */
export interface ListboxSelectEvent {
/** Option that initiated the transition. */
readonly option: Readonly<ListboxOption>;
/** Ordered next selected values. */
readonly selectedValues: readonly string[];
/** Typed cause and optional native event. */
readonly details: ChangeDetails<ListboxChangeReason>;
}
/** Listbox event map. @public */
export interface ListboxEvents {
/** Cancellable event emitted before selection changes. */
readonly beforeSelect: ListboxSelectEvent;
/** Event emitted after selection changes. */
readonly select: ListboxSelectEvent;
/** Event emitted with the published selection snapshot. */
readonly stateChange: ListboxSelectEvent;
}
/** Listbox options for state ownership and keyboard behavior. @public */
export interface ListboxOptions extends Partial<
ControllableValueOptions<readonly string[], ListboxChangeReason>
> {
/** Single or multiple selection. @defaultValue `single` */
readonly selectionMode?: ListboxSelectionMode;
/** Wraps Arrow navigation at collection edges. @defaultValue `true` */
readonly loop?: boolean;
/** Deterministic listbox ID. */
readonly id?: string;
}
/** Headless Listbox controller using active-descendant focus. @public */
export interface ListboxController
extends RuntimeController<ListboxSnapshot>, RuntimeEventSource<ListboxEvents> {
/** Registers a dynamic option and returns cleanup scoped to that registration. */
registerOption(option: ListboxOption): () => void;
/** Sets the keyboard-active enabled option. */
setActive(id: string | null): void;
/** Selects or toggles an enabled option. */
select(id: string, details?: ChangeDetails<ListboxChangeReason>): void;
/** Handles Arrow keys, Home/End, typeahead, Enter, and Space. */
handleKeyDown(event: KeyboardEvent): void;
}
/** Creates an accessible single- or multi-select Listbox with dynamic options. @public */
export function createListbox(options: ListboxOptions = {}): ListboxController {
const id = options.id ?? createRuntimeId('listbox');
const mode = options.selectionMode ?? 'single';
const collection = createCollection<ListboxOption>();
let activeId: string | null = null;
let typeahead = '';
const typeaheadTimer = createTimeoutManager();
const build = (values: readonly string[], controlled: boolean): ListboxSnapshot => ({
id,
role: 'listbox',
ariaMultiselectable: mode === 'multiple',
activeId,
selectedValues: Object.freeze([...values]),
controlled,
options: collection.items().map((option) => ({
id: option.id,
value: option.value ?? option.id,
text: option.text,
selected: values.includes(option.value ?? option.id),
disabled: option.disabled ?? false,
role: 'option',
})),
});
const host = createControllerHost<ListboxSnapshot, ListboxEvents>(
build(options.getValue?.() ?? options.defaultValue ?? [], options.getValue !== undefined),
);
const sync = (): void => {
host.update(build(state.get(), state.controlled));
};
let pendingSelection: ListboxSelectEvent | undefined;
const commit = (
selectedValues: readonly string[],
changeDetails?: ChangeDetails<ListboxChangeReason>,
): void => {
sync();
if (!changeDetails) {
pendingSelection = undefined;
return;
}
Iif (!pendingSelection) return;
activeId = pendingSelection.option.id;
const payload = { ...pendingSelection, selectedValues, details: changeDetails };
pendingSelection = undefined;
sync();
host.emit('select', payload);
host.emit('stateChange', payload);
};
const state = createControllableValue<readonly string[], ListboxChangeReason>(
{
defaultValue: options.defaultValue ?? [],
...(options.getValue ? { getValue: options.getValue } : {}),
...(options.onValueChange ? { onValueChange: options.onValueChange } : {}),
...(options.subscribeValue ? { subscribeValue: options.subscribeValue } : {}),
},
commit,
);
const setActive = (nextId: string | null): void => {
if (!host.alive()) return;
if (nextId) {
const option = collection.get(nextId);
if (!option || option.disabled) return;
}
if (activeId === nextId) return;
activeId = nextId;
sync();
};
const select = (
optionId: string,
changeDetails: ChangeDetails<ListboxChangeReason> = { reason: 'programmatic' },
): void => {
const option = collection.get(optionId);
if (!option || option.disabled) return;
const value = option.value ?? option.id;
const current = [...state.get()];
const next =
mode === 'single'
? [value]
: current.includes(value)
? current.filter((item) => item !== value)
: [...current, value];
if (current.length === next.length && current.every((item, index) => item === next[index]))
return;
const payload = { option, selectedValues: next, details: changeDetails };
if (!host.emit('beforeSelect', payload)) return;
pendingSelection = payload;
if (state.set(next, changeDetails)) commit(next, changeDetails);
};
const resetTypeahead = (): void => {
typeahead = '';
};
host.resources.add(resetTypeahead);
host.resources.add(typeaheadTimer.clear);
host.resources.add(() => state.destroy());
host.resources.add(() => collection.clear());
return {
getSnapshot: host.getSnapshot,
subscribe: host.subscribe,
on: host.on,
off: host.off,
once: host.once,
registerOption(option) {
if (!host.alive()) return () => undefined;
const unregister = collection.register(option);
if (!activeId && !option.disabled) activeId = option.id;
else if (activeId === option.id && option.disabled)
activeId = collection.edge('first') ?? null;
sync();
let active = true;
return () => {
if (!active) return;
active = false;
unregister();
const current = collection.get(option.id);
if (activeId === option.id && (!current || current.disabled))
activeId = collection.edge('first') ?? null;
sync();
};
},
setActive,
select,
handleKeyDown(event) {
if (!host.alive()) return;
let next: string | undefined;
if (event.key === 'ArrowDown')
next = collection.move(activeId ?? undefined, 1, options.loop ?? true);
else if (event.key === 'ArrowUp')
next = collection.move(activeId ?? undefined, -1, options.loop ?? true);
else if (event.key === 'Home') next = collection.edge('first');
else if (event.key === 'End') next = collection.edge('last');
else if (event.key === 'Enter' || event.key === ' ') {
if (activeId) select(activeId, { reason: 'keyboard', event });
} else if (event.key.length === 1 && !event.altKey && !event.ctrlKey && !event.metaKey) {
typeahead += event.key;
next = findTypeaheadMatch(collection.items(), typeahead, activeId ?? undefined);
typeaheadTimer.schedule(resetTypeahead, 500);
} else return;
event.preventDefault();
if (next) setActive(next);
},
destroy: host.destroy,
};
}
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