spb/admin-ka

1/*2 * noVNC: HTML5 VNC client3 * Copyright (C) 2019 The noVNC authors4 * Licensed under MPL 2.0 (see LICENSE.txt)5 *6 * See README.md for usage and integration instructions.7 */89export default class EventTargetMixin {10    constructor() {11        this._listeners = new Map();12    }1314    addEventListener(type, callback) {15        if (!this._listeners.has(type)) {16            this._listeners.set(type, new Set());17        }18        this._listeners.get(type).add(callback);19    }2021    removeEventListener(type, callback) {22        if (this._listeners.has(type)) {23            this._listeners.get(type).delete(callback);24        }25    }2627    dispatchEvent(event) {28        if (!this._listeners.has(event.type)) {29            return true;30        }31        this._listeners.get(event.type)32            .forEach(callback => callback.call(this, event));33        return !event.defaultPrevented;34    }35}36