36 lines
896 B
JavaScript
36 lines
896 B
JavaScript
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/*
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* noVNC: HTML5 VNC client
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* Copyright (C) 2019 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 = new Map();
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}
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addEventListener(type, callback) {
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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.has(type)) {
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this._listeners.get(type).delete(callback);
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}
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}
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dispatchEvent(event) {
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if (!this._listeners.has(event.type)) {
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return true;
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}
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this._listeners.get(event.type)
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.forEach(callback => callback.call(this, event));
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return !event.defaultPrevented;
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}
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}
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