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/**
* @file text-track-list.js
*/
import TrackList from './track-list';
/** @import TextTrack from './text-track' */
/**
* The current list of {@link TextTrack} for a media file.
*
* @see [Spec]{@link https://html.spec.whatwg.org/multipage/embedded-content.html#texttracklist}
* @extends TrackList
*/
class TextTrackList extends TrackList {
/**
* Add a {@link TextTrack} to the `TextTrackList`
*
* @param {TextTrack} track
* The text track to add to the list.
*
* @fires TrackList#addtrack
*/
addTrack(track) {
super.addTrack(track);
if (!this.queueChange_) {
this.queueChange_ = () => this.queueTrigger('change');
}
if (!this.triggerSelectedlanguagechange) {
this.triggerSelectedlanguagechange_ = () => this.trigger('selectedlanguagechange');
}
/**
* @listens TextTrack#modechange
* @fires TrackList#change
*/
track.addEventListener('modechange', this.queueChange_);
const nonLanguageTextTrackKind = ['metadata', 'chapters'];
if (nonLanguageTextTrackKind.indexOf(track.kind) === -1) {
track.addEventListener('modechange', this.triggerSelectedlanguagechange_);
}
}
removeTrack(rtrack) {
super.removeTrack(rtrack);
// manually remove the event handlers we added
if (rtrack.removeEventListener) {
if (this.queueChange_) {
rtrack.removeEventListener('modechange', this.queueChange_);
}
if (this.selectedlanguagechange_) {
rtrack.removeEventListener('modechange', this.triggerSelectedlanguagechange_);
}
}
}
/**
* Creates a serializable array of objects that contains serialized copies
* of each text track.
*
* @return {Object[]} A serializable list of objects for the text track list
*/
toJSON() {
return this.tracks_.map((track) => track.toJSON());
}
}
export default TextTrackList;
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