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/**
* @file html-track-element-list.js
*/
/**
* The current list of {@link HtmlTrackElement}s.
*/
class HtmlTrackElementList {
/**
* Create an instance of this class.
*
* @param {HtmlTrackElement[]} [tracks=[]]
* A list of `HtmlTrackElement` to instantiate the list with.
*/
constructor(trackElements = []) {
this.trackElements_ = [];
/**
* @memberof HtmlTrackElementList
* @member {number} length
* The current number of `Track`s in the this Trackist.
* @instance
*/
Object.defineProperty(this, 'length', {
get() {
return this.trackElements_.length;
}
});
for (let i = 0, length = trackElements.length; i < length; i++) {
this.addTrackElement_(trackElements[i]);
}
}
/**
* Add an {@link HtmlTrackElement} to the `HtmlTrackElementList`
*
* @param {HtmlTrackElement} trackElement
* The track element to add to the list.
*
* @private
*/
addTrackElement_(trackElement) {
const index = this.trackElements_.length;
if (!('' + index in this)) {
Object.defineProperty(this, index, {
get() {
return this.trackElements_[index];
}
});
}
// Do not add duplicate elements
if (this.trackElements_.indexOf(trackElement) === -1) {
this.trackElements_.push(trackElement);
}
}
/**
* Get an {@link HtmlTrackElement} from the `HtmlTrackElementList` given an
* {@link TextTrack}.
*
* @param {TextTrack} track
* The track associated with a track element.
*
* @return {HtmlTrackElement|undefined}
* The track element that was found or undefined.
*
* @private
*/
getTrackElementByTrack_(track) {
let trackElement_;
for (let i = 0, length = this.trackElements_.length; i < length; i++) {
if (track === this.trackElements_[i].track) {
trackElement_ = this.trackElements_[i];
break;
}
}
return trackElement_;
}
/**
* Remove a {@link HtmlTrackElement} from the `HtmlTrackElementList`
*
* @param {HtmlTrackElement} trackElement
* The track element to remove from the list.
*
* @private
*/
removeTrackElement_(trackElement) {
for (let i = 0, length = this.trackElements_.length; i < length; i++) {
if (trackElement === this.trackElements_[i]) {
if (this.trackElements_[i].track && typeof this.trackElements_[i].track.off === 'function') {
this.trackElements_[i].track.off();
}
if (typeof this.trackElements_[i].off === 'function') {
this.trackElements_[i].off();
}
this.trackElements_.splice(i, 1);
break;
}
}
}
}
export default HtmlTrackElementList;
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