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quality-level-list.js
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quality-level-list.js
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import videojs from 'video.js';
import QualityLevel from './quality-level.js';
/**
* A list of QualityLevels.
*
* interface QualityLevelList : EventTarget {
* getter QualityLevel (unsigned long index);
* readonly attribute unsigned long length;
* readonly attribute long selectedIndex;
*
* void addQualityLevel(QualityLevel qualityLevel)
* void removeQualityLevel(QualityLevel remove)
* QualityLevel? getQualityLevelById(DOMString id);
*
* attribute EventHandler onchange;
* attribute EventHandler onaddqualitylevel;
* attribute EventHandler onremovequalitylevel;
* };
*
* @extends videojs.EventTarget
* @class QualityLevelList
*/
class QualityLevelList extends videojs.EventTarget {
/**
* Creates a QualityLevelList.
*/
constructor() {
super();
let list = this; // eslint-disable-line
list.levels_ = [];
list.selectedIndex_ = -1;
/**
* Get the index of the currently selected QualityLevel.
*
* @returns {number} The index of the selected QualityLevel. -1 if none selected.
* @readonly
*/
Object.defineProperty(list, 'selectedIndex', {
get() {
return list.selectedIndex_;
}
});
/**
* Get the length of the list of QualityLevels.
*
* @returns {number} The length of the list.
* @readonly
*/
Object.defineProperty(list, 'length', {
get() {
return list.levels_.length;
}
});
list[Symbol.iterator] = () => list.levels_.values();
return list;
}
/**
* Adds a quality level to the list.
*
* @param {Representation|Object} representation The representation of the quality level
* @param {string} representation.id Unique id of the QualityLevel
* @param {number=} representation.width Resolution width of the QualityLevel
* @param {number=} representation.height Resolution height of the QualityLevel
* @param {number} representation.bandwidth Bitrate of the QualityLevel
* @param {number=} representation.frameRate Frame-rate of the QualityLevel
* @param {Function} representation.enabled Callback to enable/disable QualityLevel
* @return {QualityLevel} the QualityLevel added to the list
* @method addQualityLevel
*/
addQualityLevel(representation) {
let qualityLevel = this.getQualityLevelById(representation.id);
// Do not add duplicate quality levels
if (qualityLevel) {
return qualityLevel;
}
const index = this.levels_.length;
qualityLevel = new QualityLevel(representation);
if (!('' + index in this)) {
Object.defineProperty(this, index, {
get() {
return this.levels_[index];
}
});
}
this.levels_.push(qualityLevel);
this.trigger({
qualityLevel,
type: 'addqualitylevel'
});
return qualityLevel;
}
/**
* Removes a quality level from the list.
*
* @param {QualityLevel} qualityLevel The QualityLevel to remove from the list.
* @return {QualityLevel|null} the QualityLevel removed or null if nothing removed
* @method removeQualityLevel
*/
removeQualityLevel(qualityLevel) {
let removed = null;
for (let i = 0, l = this.length; i < l; i++) {
if (this[i] === qualityLevel) {
removed = this.levels_.splice(i, 1)[0];
if (this.selectedIndex_ === i) {
this.selectedIndex_ = -1;
} else if (this.selectedIndex_ > i) {
this.selectedIndex_--;
}
break;
}
}
if (removed) {
this.trigger({
qualityLevel,
type: 'removequalitylevel'
});
}
return removed;
}
/**
* Searches for a QualityLevel with the given id.
*
* @param {string} id The id of the QualityLevel to find.
* @return {QualityLevel|null} The QualityLevel with id, or null if not found.
* @method getQualityLevelById
*/
getQualityLevelById(id) {
for (let i = 0, l = this.length; i < l; i++) {
const level = this[i];
if (level.id === id) {
return level;
}
}
return null;
}
/**
* Resets the list of QualityLevels to empty
*
* @method dispose
*/
dispose() {
this.selectedIndex_ = -1;
this.levels_.length = 0;
}
}
/**
* change - The selected QualityLevel has changed.
* addqualitylevel - A QualityLevel has been added to the QualityLevelList.
* removequalitylevel - A QualityLevel has been removed from the QualityLevelList.
*/
QualityLevelList.prototype.allowedEvents_ = {
change: 'change',
addqualitylevel: 'addqualitylevel',
removequalitylevel: 'removequalitylevel'
};
// emulate attribute EventHandler support to allow for feature detection
for (const event in QualityLevelList.prototype.allowedEvents_) {
QualityLevelList.prototype['on' + event] = null;
}
export default QualityLevelList;