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84586c0f17
* Change copyright header This updates the copyright header to say "The noVNC Authors". People who previously had copyright listings are now under the AUTHORS file.
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 (C) 2018 The noVNC Authors
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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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export default class EventTargetMixin {
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constructor() {
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this._listeners = null;
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}
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addEventListener(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(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(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((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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