@base-ui/react/utils/popups/usePopupHandleStore.mjs

Base UI is a library of headless ('unstyled') React components and low-level hooks. You gain complete control over your app's CSS and accessibility features.

'use client';

import * as React from 'react';
import { useSyncExternalStore } from 'use-sync-external-store/shim';
import { NOOP } from '@base-ui/utils/empty';
/**
 * Reads the store currently exposed by a popup handle and subscribes to store-pointer changes.
 * Detached triggers use this to follow a handle as a root attaches or detaches: while no root is
 * attached, the handle exposes its fallback store; once a root attaches, subscribers re-render and
 * read from the live root store.
 *
 * Returns `undefined` when no handle is provided so callers can fall back to their root context.
 *
 * @param handle The popup handle to read from, or `undefined` when the trigger is not handle-bound.
 */
export function usePopupHandleStore(handle) {
  const subscribe = React.useCallback(listener => {
    if (handle === undefined) {
      return NOOP;
    }
    return handle.subscribeStore(listener);
  }, [handle]);
  const getSnapshot = React.useCallback(() => {
    return handle === undefined ? undefined : handle.store;
  }, [handle]);
  return useSyncExternalStore(subscribe, getSnapshot, () => handle?.serverStore);
}