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