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/**
* @file track.js
*/
import * as Guid from '../utils/guid.js';
import EventTarget from '../event-target';
/**
* A Track class that contains all of the common functionality for {@link AudioTrack},
* {@link VideoTrack}, and {@link TextTrack}.
*
* > Note: This class should not be used directly
*
* @see {@link https://html.spec.whatwg.org/multipage/embedded-content.html}
* @extends EventTarget
* @abstract
*/
class Track extends EventTarget {
/**
* Create an instance of this class.
*
* @param {Object} [options={}]
* Object of option names and values
*
* @param {string} [options.kind='']
* A valid kind for the track type you are creating.
*
* @param {string} [options.id='vjs_track_' + Guid.newGUID()]
* A unique id for this AudioTrack.
*
* @param {string} [options.label='']
* The menu label for this track.
*
* @param {string} [options.language='']
* A valid two character language code.
*
* @abstract
*/
constructor(options = {}) {
super();
const trackProps = {
id: options.id || 'vjs_track_' + Guid.newGUID(),
kind: options.kind || '',
language: options.language || ''
};
let label = options.label || '';
/**
* @memberof Track
* @member {string} id
* The id of this track. Cannot be changed after creation.
* @instance
*
* @readonly
*/
/**
* @memberof Track
* @member {string} kind
* The kind of track that this is. Cannot be changed after creation.
* @instance
*
* @readonly
*/
/**
* @memberof Track
* @member {string} language
* The two letter language code for this track. Cannot be changed after
* creation.
* @instance
*
* @readonly
*/
for (const key in trackProps) {
Object.defineProperty(this, key, {
get() {
return trackProps[key];
},
set() {}
});
}
/**
* @memberof Track
* @member {string} label
* The label of this track. Cannot be changed after creation.
* @instance
*
* @fires Track#labelchange
*/
Object.defineProperty(this, 'label', {
get() {
return label;
},
set(newLabel) {
if (newLabel !== label) {
label = newLabel;
/**
* An event that fires when label changes on this track.
*
* > Note: This is not part of the spec!
*
* @event Track#labelchange
* @type {Event}
*/
this.trigger('labelchange');
}
}
});
}
}
export default Track;
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