www.aleph1.co.uk Git - yaffs-website/blob - node_modules/video.js/es5/tracks/audio-track-list.js

   1 'use strict';
   2
   3 exports.__esModule = true;
   4
   5 var _trackList = require('./track-list');
   6
   7 var _trackList2 = _interopRequireDefault(_trackList);
   8
   9 var _browser = require('../utils/browser.js');
  10
  11 var browser = _interopRequireWildcard(_browser);
  12
  13 var _document = require('global/document');
  14
  15 var _document2 = _interopRequireDefault(_document);
  16
  17 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; } }
  18
  19 function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }
  20
  21 function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
  22
  23 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; }
  24
  25 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; } /**
  26                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 * @file audio-track-list.js
  27                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 */
  28
  29
  30 /**
  31  * Anywhere we call this function we diverge from the spec
  32  * as we only support one enabled audiotrack at a time
  33  *
  34  * @param {AudioTrackList} list
  35  *        list to work on
  36  *
  37  * @param {AudioTrack} track
  38  *        The track to skip
  39  *
  40  * @private
  41  */
  42 var disableOthers = function disableOthers(list, track) {
  43   for (var i = 0; i < list.length; i++) {
  44     if (track.id === list[i].id) {
  45       continue;
  46     }
  47     // another audio track is enabled, disable it
  48     list[i].enabled = false;
  49   }
  50 };
  51
  52 /**
  53  * The current list of {@link AudioTrack} for a media file.
  54  *
  55  * @see [Spec]{@link https://html.spec.whatwg.org/multipage/embedded-content.html#audiotracklist}
  56  * @extends TrackList
  57  */
  58
  59 var AudioTrackList = function (_TrackList) {
  60   _inherits(AudioTrackList, _TrackList);
  61
  62   /**
  63    * Create an instance of this class.
  64    *
  65    * @param {AudioTrack[]} [tracks=[]]
  66    *        A list of `AudioTrack` to instantiate the list with.
  67    */
  68   function AudioTrackList() {
  69     var _this, _ret;
  70
  71     var tracks = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];
  72
  73     _classCallCheck(this, AudioTrackList);
  74
  75     var list = void 0;
  76
  77     // make sure only 1 track is enabled
  78     // sorted from last index to first index
  79     for (var i = tracks.length - 1; i >= 0; i--) {
  80       if (tracks[i].enabled) {
  81         disableOthers(tracks, tracks[i]);
  82         break;
  83       }
  84     }
  85
  86     // IE8 forces us to implement inheritance ourselves
  87     // as it does not support Object.defineProperty properly
  88     if (browser.IS_IE8) {
  89       list = _document2['default'].createElement('custom');
  90       for (var prop in _trackList2['default'].prototype) {
  91         if (prop !== 'constructor') {
  92           list[prop] = _trackList2['default'].prototype[prop];
  93         }
  94       }
  95       for (var _prop in AudioTrackList.prototype) {
  96         if (_prop !== 'constructor') {
  97           list[_prop] = AudioTrackList.prototype[_prop];
  98         }
  99       }
 100     }
 101
 102     list = (_this = _possibleConstructorReturn(this, _TrackList.call(this, tracks, list)), _this);
 103     list.changing_ = false;
 104
 105     return _ret = list, _possibleConstructorReturn(_this, _ret);
 106   }
 107
 108   /**
 109    * Add an {@link AudioTrack} to the `AudioTrackList`.
 110    *
 111    * @param {AudioTrack} track
 112    *        The AudioTrack to add to the list
 113    *
 114    * @fires Track#addtrack
 115    * @private
 116    */
 117
 118
 119   AudioTrackList.prototype.addTrack_ = function addTrack_(track) {
 120     var _this2 = this;
 121
 122     if (track.enabled) {
 123       disableOthers(this, track);
 124     }
 125
 126     _TrackList.prototype.addTrack_.call(this, track);
 127     // native tracks don't have this
 128     if (!track.addEventListener) {
 129       return;
 130     }
 131
 132     /**
 133      * @listens AudioTrack#enabledchange
 134      * @fires TrackList#change
 135      */
 136     track.addEventListener('enabledchange', function () {
 137       // when we are disabling other tracks (since we don't support
 138       // more than one track at a time) we will set changing_
 139       // to true so that we don't trigger additional change events
 140       if (_this2.changing_) {
 141         return;
 142       }
 143       _this2.changing_ = true;
 144       disableOthers(_this2, track);
 145       _this2.changing_ = false;
 146       _this2.trigger('change');
 147     });
 148   };
 149
 150   /**
 151    * Add an {@link AudioTrack} to the `AudioTrackList`.
 152    *
 153    * @param {AudioTrack} track
 154    *        The AudioTrack to add to the list
 155    *
 156    * @fires Track#addtrack
 157    */
 158
 159
 160   AudioTrackList.prototype.addTrack = function addTrack(track) {
 161     this.addTrack_(track);
 162   };
 163
 164   /**
 165    * Remove an {@link AudioTrack} from the `AudioTrackList`.
 166    *
 167    * @param {AudioTrack} track
 168    *        The AudioTrack to remove from the list
 169    *
 170    * @fires Track#removetrack
 171    */
 172
 173
 174   AudioTrackList.prototype.removeTrack = function removeTrack(track) {
 175     _TrackList.prototype.removeTrack_.call(this, track);
 176   };
 177
 178   return AudioTrackList;
 179 }(_trackList2['default']);
 180
 181 exports['default'] = AudioTrackList;