[yaffs-website] / node_modules / video.js / es5 / tracks / track-list.js

'use strict';

exports.__esModule = true;

var _eventTarget = require('../event-target');

var _eventTarget2 = _interopRequireDefault(_eventTarget);

var _browser = require('../utils/browser.js');

var browser = _interopRequireWildcard(_browser);

var _document = require('global/document');

var _document2 = _interopRequireDefault(_document);

function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj['default'] = obj; return newObj; } }

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; } /**
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                * @file track-list.js
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                */


/**
 * Common functionaliy between {@link TextTrackList}, {@link AudioTrackList}, and
 * {@link VideoTrackList}
 *
 * @extends EventTarget
 */
var TrackList = function (_EventTarget) {
  _inherits(TrackList, _EventTarget);

  /**
   * Create an instance of this class
   *
   * @param {Track[]} tracks
   *        A list of tracks to initialize the list with.
   *
   * @param {Object} [list]
   *        The child object with inheritance done manually for ie8.
   *
   * @abstract
   */
  function TrackList() {
    var tracks = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];

    var _ret;

    var list = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null;

    _classCallCheck(this, TrackList);

    var _this = _possibleConstructorReturn(this, _EventTarget.call(this));

    if (!list) {
      list = _this; // eslint-disable-line
      if (browser.IS_IE8) {
        list = _document2['default'].createElement('custom');
        for (var prop in TrackList.prototype) {
          if (prop !== 'constructor') {
            list[prop] = TrackList.prototype[prop];
          }
        }
      }
    }

    list.tracks_ = [];

    /**
     * @member {number} length
     *         The current number of `Track`s in the this Trackist.
     */
    Object.defineProperty(list, 'length', {
      get: function get() {
        return this.tracks_.length;
      }
    });

    for (var i = 0; i < tracks.length; i++) {
      list.addTrack_(tracks[i]);
    }

    // must return the object, as for ie8 it will not be this
    // but a reference to a document object
    return _ret = list, _possibleConstructorReturn(_this, _ret);
  }

  /**
   * Add a {@link Track} to the `TrackList`
   *
   * @param {Track} track
   *        The audio, video, or text track to add to the list.
   *
   * @fires TrackList#addtrack
   * @private
   */


  TrackList.prototype.addTrack_ = function addTrack_(track) {
    var index = this.tracks_.length;

    if (!('' + index in this)) {
      Object.defineProperty(this, index, {
        get: function get() {
          return this.tracks_[index];
        }
      });
    }

    // Do not add duplicate tracks
    if (this.tracks_.indexOf(track) === -1) {
      this.tracks_.push(track);
      /**
       * Triggered when a track is added to a track list.
       *
       * @event TrackList#addtrack
       * @type {EventTarget~Event}
       * @property {Track} track
       *           A reference to track that was added.
       */
      this.trigger({
        track: track,
        type: 'addtrack'
      });
    }
  };

  /**
   * Remove a {@link Track} from the `TrackList`
   *
   * @param {Track} track
   *        The audio, video, or text track to remove from the list.
   *
   * @fires TrackList#removetrack
   * @private
   */


  TrackList.prototype.removeTrack_ = function removeTrack_(rtrack) {
    var track = void 0;

    for (var i = 0, l = this.length; i < l; i++) {
      if (this[i] === rtrack) {
        track = this[i];
        if (track.off) {
          track.off();
        }

        this.tracks_.splice(i, 1);

        break;
      }
    }

    if (!track) {
      return;
    }

    /**
     * Triggered when a track is removed from track list.
     *
     * @event TrackList#removetrack
     * @type {EventTarget~Event}
     * @property {Track} track
     *           A reference to track that was removed.
     */
    this.trigger({
      track: track,
      type: 'removetrack'
    });
  };

  /**
   * Get a Track from the TrackList by a tracks id
   *
   * @param {String} id - the id of the track to get
   * @method getTrackById
   * @return {Track}
   * @private
   */


  TrackList.prototype.getTrackById = function getTrackById(id) {
    var result = null;

    for (var i = 0, l = this.length; i < l; i++) {
      var track = this[i];

      if (track.id === id) {
        result = track;
        break;
      }
    }

    return result;
  };

  return TrackList;
}(_eventTarget2['default']);

/**
 * Triggered when a different track is selected/enabled.
 *
 * @event TrackList#change
 * @type {EventTarget~Event}
 */

/**
 * Events that can be called with on + eventName. See {@link EventHandler}.
 *
 * @property {Object} TrackList#allowedEvents_
 * @private
 */


TrackList.prototype.allowedEvents_ = {
  change: 'change',
  addtrack: 'addtrack',
  removetrack: 'removetrack'
};

// emulate attribute EventHandler support to allow for feature detection
for (var event in TrackList.prototype.allowedEvents_) {
  TrackList.prototype['on' + event] = null;
}

exports['default'] = TrackList;