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/*
* noVNC: HTML5 VNC client
* Copyright 2017 Pierre Ossman for Cendio AB
* Licensed under MPL 2.0 (see LICENSE.txt)
*
* See README.md for usage and integration instructions.
*/
var EventTargetMixin = {
_listeners: null,
addEventListener: function(type, callback) {
if (!this._listeners) {
this._listeners = new Map();
}
if (!this._listeners.has(type)) {
this._listeners.set(type, new Set());
}
this._listeners.get(type).add(callback);
},
removeEventListener: function(type, callback) {
if (!this._listeners || !this._listeners.has(type)) {
return;
}
this._listeners.get(type).delete(callback);
},
dispatchEvent: function(event) {
if (!this._listeners || !this._listeners.has(event.type)) {
return true;
}
this._listeners.get(event.type).forEach(function (callback) {
callback.call(this, event);
}, this);
return !event.defaultPrevented;
},
};
export default EventTargetMixin;
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