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/**
* @file text-track-cue-list.js
*/
/**
* @typedef {Object} TextTrackCueList~TextTrackCue
*
* @property {string} id
* The unique id for this text track cue
*
* @property {number} startTime
* The start time for this text track cue
*
* @property {number} endTime
* The end time for this text track cue
*
* @property {boolean} pauseOnExit
* Pause when the end time is reached if true.
*
* @see [Spec]{@link https://html.spec.whatwg.org/multipage/embedded-content.html#texttrackcue}
*/
/**
* A List of TextTrackCues.
*
* @see [Spec]{@link https://html.spec.whatwg.org/multipage/embedded-content.html#texttrackcuelist}
*/
class TextTrackCueList {
/**
* Create an instance of this class..
*
* @param {Array} cues
* A list of cues to be initialized with
*/
constructor(cues) {
TextTrackCueList.prototype.setCues_.call(this, cues);
/**
* @memberof TextTrackCueList
* @member {number} length
* The current number of `TextTrackCue`s in the TextTrackCueList.
* @instance
*/
Object.defineProperty(this, 'length', {
get() {
return this.length_;
}
});
}
/**
* A setter for cues in this list. Creates getters
* an an index for the cues.
*
* @param {Array} cues
* An array of cues to set
*
* @private
*/
setCues_(cues) {
const oldLength = this.length || 0;
let i = 0;
const l = cues.length;
this.cues_ = cues;
this.length_ = cues.length;
const defineProp = function(index) {
if (!('' + index in this)) {
Object.defineProperty(this, '' + index, {
get() {
return this.cues_[index];
}
});
}
};
if (oldLength < l) {
i = oldLength;
for (; i < l; i++) {
defineProp.call(this, i);
}
}
}
/**
* Get a `TextTrackCue` that is currently in the `TextTrackCueList` by id.
*
* @param {string} id
* The id of the cue that should be searched for.
*
* @return {TextTrackCueList~TextTrackCue|null}
* A single cue or null if none was found.
*/
getCueById(id) {
let result = null;
for (let i = 0, l = this.length; i < l; i++) {
const cue = this[i];
if (cue.id === id) {
result = cue;
break;
}
}
return result;
}
}
export default TextTrackCueList;
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