@theoplayer/react-native-ui/lib/module/ui/hooks/useChaptersTrack.js

A React Native UI for @theoplayer/react-native

import { useCallback, useContext, useSyncExternalStore } from 'react';
import { PlayerContext } from '@theoplayer/react-native-ui';
import { PlayerEventType } from 'react-native-theoplayer';
const TEXT_TRACK_CHANGE_EVENTS = [PlayerEventType.LOADED_DATA, PlayerEventType.TEXT_TRACK_LIST];

/**
 * Retain first chapters track encountered in the textTracks list.
 */
function filterChaptersTrack(textTracks) {
  return textTracks && textTracks.find(isChaptersTrack);
}

/**
 * Query whether a track is a valid chapters track.
 */
function isChaptersTrack(textTrack) {
  return textTrack.kind === 'chapters';
}

/**
 * Returns a chapters track, if available.
 *
 * This hook must only be used in a component mounted inside a {@link THEOplayerDefaultUi} or {@link UiContainer},
 * or alternatively any other component that provides a {@link PlayerContext}.
 *
 * @group Hooks
 */
export const useChaptersTrack = () => {
  const {
    player
  } = useContext(PlayerContext);
  const subscribe = useCallback(callback => {
    TEXT_TRACK_CHANGE_EVENTS.forEach(event => player?.addEventListener(event, callback));
    return () => TEXT_TRACK_CHANGE_EVENTS.forEach(event => player?.removeEventListener(event, callback));
  }, [player]);
  return useSyncExternalStore(subscribe, () => filterChaptersTrack(player.textTracks));
};
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