control-bar_track-button.js#

/**
 * @file track-button.js
 */
import MenuButton from '../menu/menu-button.js';
import Component from '../component.js';
import * as Fn from '../utils/fn.js';
 
/** @import Player from './player' */
 
/**
 * The base class for buttons that toggle specific  track types (e.g. subtitles).
 *
 * @extends MenuButton
 */
class TrackButton extends MenuButton {
 
  /**
   * Creates an instance of this class.
   *
   * @param {Player} player
   *        The `Player` that this class should be attached to.
   *
   * @param {Object} [options]
   *        The key/value store of player options.
   */
  constructor(player, options) {
    const tracks = options.tracks;
 
    super(player, options);
 
    if (this.items.length <= 1) {
      this.hide();
    }
 
    if (!tracks) {
      return;
    }
 
    const updateHandler = Fn.bind_(this, this.update);
 
    tracks.addEventListener('removetrack', updateHandler);
    tracks.addEventListener('addtrack', updateHandler);
    tracks.addEventListener('labelchange', updateHandler);
    this.player_.on('ready', updateHandler);
 
    this.player_.on('dispose', function() {
      tracks.removeEventListener('removetrack', updateHandler);
      tracks.removeEventListener('addtrack', updateHandler);
      tracks.removeEventListener('labelchange', updateHandler);
    });
  }
 
}
 
Component.registerComponent('TrackButton', TrackButton);
export default TrackButton;