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import { createCollection, type CollectionItem } from '../collections/collection';
import { createControllerHost } from '../core/host';
import type {
ChangeDetails,
ControllableValueOptions,
RuntimeController,
RuntimeEventSource,
} from '../core/types';
import { focusById } from '../focus/focus';
import { createControllableValue } from '../state/controllable';
/** Tabs activation behavior. @public */
export type TabsActivation = 'automatic' | 'manual';
/** Tabs orientation used for keyboard direction. @public */
export type TabsOrientation = 'horizontal' | 'vertical';
/** Causes of tab selection. @public */
export type TabsChangeReason = 'programmatic' | 'pointer' | 'keyboard' | 'focus';
/** Dynamic tab and panel registration. @public */
export interface TabItem extends CollectionItem {
/** Optional deterministic tab element ID. */
readonly tabId?: string;
/** Optional deterministic panel element ID. */
readonly panelId?: string;
}
/** Immutable tab/panel relationship metadata. @public */
export interface TabItemSnapshot {
/** Stable item ID. */
readonly id: string;
/** Consumer-rendered tab ID. */
readonly tabId: string;
/** Consumer-rendered panel ID. */
readonly panelId: string;
/** Value for `aria-selected`. */
readonly selected: boolean;
/** Value for `tabindex`. */
readonly tabIndex: 0 | -1;
/** Whether the tab is disabled. */
readonly disabled: boolean;
}
/** Immutable Tabs snapshot. @public */
export interface TabsSnapshot {
/** Selected tab item ID. */
readonly selectedId: string | null;
/** Roving-focus tab item ID. */
readonly focusedId: string | null;
/** Consumer-owned state indicator. */
readonly controlled: boolean;
/** Configured orientation. */
readonly orientation: TabsOrientation;
/** Configured activation behavior. */
readonly activation: TabsActivation;
/** Ordered tab/panel metadata. */
readonly items: readonly TabItemSnapshot[];
}
/** Tab selection lifecycle payload. @public */
export interface TabsChangeEvent {
/** Next selected item ID. */
readonly selectedId: string;
/** Typed cause and optional native event. */
readonly details: ChangeDetails<TabsChangeReason>;
}
/** Tabs event map. @public */
export interface TabsEvents {
/** Cancellable event emitted before selection. */
readonly beforeSelect: TabsChangeEvent;
/** Event emitted after selection. */
readonly select: TabsChangeEvent;
/** Event emitted with the published selection snapshot. */
readonly stateChange: TabsChangeEvent;
}
/** Tabs configuration with controlled/uncontrolled selection. @public */
export interface TabsOptions extends Partial<
ControllableValueOptions<string | null, TabsChangeReason>
> {
/** Manual or automatic selection on focus. @defaultValue `automatic` */
readonly activation?: TabsActivation;
/** Horizontal or vertical arrow-key model. @defaultValue `horizontal` */
readonly orientation?: TabsOrientation;
/** Right-to-left horizontal keyboard direction. @defaultValue `false` */
readonly rtl?: boolean;
/** Wraps at collection edges. @defaultValue `true` */
readonly loop?: boolean;
/** Stable relationship ID prefix. */
readonly id?: string;
}
/** Headless Tabs controller. @public */
export interface TabsController
extends RuntimeController<TabsSnapshot>, RuntimeEventSource<TabsEvents> {
/** Registers a dynamic tab and optional focusable tab element. */
registerTab(item: TabItem, element?: HTMLElement): () => void;
/** Selects an enabled tab and synchronizes roving focus. */
select(id: string, details?: ChangeDetails<TabsChangeReason>): void;
/** Focuses an enabled tab, selecting it in automatic mode. */
focus(id: string, details?: ChangeDetails<TabsChangeReason>): void;
/** Handles orientation-aware Arrow keys, Home, End, Enter, and Space. */
handleKeyDown(id: string, event: KeyboardEvent): void;
}
/** Creates WAI-ARIA Tabs with dynamic registration and no renderer assumptions. @public */
export function createTabs(options: TabsOptions = {}): TabsController {
const collection = createCollection<TabItem>();
const elements = new Map<string, HTMLElement>();
const registrations = new Map<string, symbol>();
const orientation = options.orientation ?? 'horizontal';
const activation = options.activation ?? 'automatic';
const prefix = options.id ?? createRuntimeId('tabs');
let focusedId: string | null = null;
const build = (selectedId: string | null, controlled: boolean): TabsSnapshot => ({
selectedId,
focusedId,
controlled,
orientation,
activation,
items: collection.items().map((item) => ({
id: item.id,
tabId: item.tabId ?? `${prefix}-${item.id}-tab`,
panelId: item.panelId ?? `${prefix}-${item.id}-panel`,
selected: selectedId === item.id,
tabIndex: focusedId === item.id ? 0 : -1,
disabled: item.disabled ?? false,
})),
});
const host = createControllerHost<TabsSnapshot, TabsEvents>(
build(options.getValue?.() ?? options.defaultValue ?? null, options.getValue !== undefined),
);
const sync = (): void => {
host.update(build(state.get(), state.controlled));
};
let pendingChange: TabsChangeEvent | undefined;
const commit = (
selectedId: string | null,
changeDetails?: ChangeDetails<TabsChangeReason>,
): void => {
if (selectedId && collection.get(selectedId) && !collection.get(selectedId)?.disabled)
focusedId = selectedId;
sync();
if (!selectedId || !changeDetails || !pendingChange) return;
const payload = { selectedId, details: changeDetails };
pendingChange = undefined;
host.emit('select', payload);
host.emit('stateChange', payload);
};
const state = createControllableValue<string | null, TabsChangeReason>(
{
defaultValue: options.defaultValue ?? null,
...(options.getValue ? { getValue: options.getValue } : {}),
...(options.onValueChange ? { onValueChange: options.onValueChange } : {}),
...(options.subscribeValue ? { subscribeValue: options.subscribeValue } : {}),
},
commit,
);
const select = (
id: string,
changeDetails: ChangeDetails<TabsChangeReason> = { reason: 'programmatic' },
): void => {
const item = collection.get(id);
if (!item || item.disabled || state.get() === id) return;
const payload = { selectedId: id, details: changeDetails };
if (!host.emit('beforeSelect', payload)) return;
pendingChange = payload;
if (state.set(id, changeDetails)) commit(id, changeDetails);
};
const focus = (
id: string,
changeDetails: ChangeDetails<TabsChangeReason> = { reason: 'focus' },
): void => {
const item = collection.get(id);
if (!item || item.disabled) return;
focusedId = id;
sync();
focusById(elements, id);
if (activation === 'automatic') select(id, changeDetails);
};
host.resources.add(() => state.destroy());
host.resources.add(() => collection.clear());
host.resources.add(() => elements.clear());
host.resources.add(() => registrations.clear());
return {
getSnapshot: host.getSnapshot,
subscribe: host.subscribe,
on: host.on,
off: host.off,
once: host.once,
registerTab(item, element) {
if (!host.alive()) return () => undefined;
const token = Symbol(item.id);
registrations.set(item.id, token);
const unregister = collection.register(item);
if (element) elements.set(item.id, element);
else elements.delete(item.id);
if (!focusedId && !item.disabled) focusedId = item.id;
else if (focusedId === item.id && item.disabled) focusedId = collection.edge('first') ?? null;
if (!state.get() && !item.disabled) state.set(item.id, { reason: 'programmatic' });
else if (state.get() === item.id && item.disabled)
state.set(collection.edge('first') ?? null, { reason: 'programmatic' });
sync();
let active = true;
return () => {
if (!active) return;
active = false;
unregister();
if (registrations.get(item.id) === token) {
registrations.delete(item.id);
elements.delete(item.id);
}
const current = collection.get(item.id);
if (focusedId === item.id && (!current || current.disabled))
focusedId = collection.edge('first') ?? null;
if (state.get() === item.id && (!current || current.disabled)) {
const next = collection.edge('first') ?? null;
state.set(next, { reason: 'programmatic' });
}
sync();
};
},
select,
focus,
handleKeyDown(id, event) {
if (!host.alive()) return;
let target: string | undefined;
const forward =
orientation === 'horizontal' ? (options.rtl ? 'ArrowLeft' : 'ArrowRight') : 'ArrowDown';
const backward =
orientation === 'horizontal' ? (options.rtl ? 'ArrowRight' : 'ArrowLeft') : 'ArrowUp';
if (event.key === forward) target = collection.move(id, 1, options.loop ?? true);
else if (event.key === backward) target = collection.move(id, -1, options.loop ?? true);
else if (event.key === 'Home') target = collection.edge('first');
else if (event.key === 'End') target = collection.edge('last');
else if (activation === 'manual' && (event.key === 'Enter' || event.key === ' ')) {
event.preventDefault();
select(id, { reason: 'keyboard', event });
return;
} else return;
event.preventDefault();
if (target) focus(target, { reason: 'keyboard', event });
},
destroy: host.destroy,
};
}
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