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e89eef94 PO |
1 | /* |
2 | * noVNC: HTML5 VNC client | |
412d9306 | 3 | * Copyright (C) 2019 The noVNC Authors |
e89eef94 PO |
4 | * Licensed under MPL 2.0 (see LICENSE.txt) |
5 | * | |
6 | * See README.md for usage and integration instructions. | |
7 | */ | |
8 | ||
0e4808bf JD |
9 | export default class EventTargetMixin { |
10 | constructor() { | |
11ef5354 | 11 | this._listeners = new Map(); |
0e4808bf | 12 | } |
e89eef94 | 13 | |
7b536961 | 14 | addEventListener(type, callback) { |
7b536961 PO |
15 | if (!this._listeners.has(type)) { |
16 | this._listeners.set(type, new Set()); | |
17 | } | |
18 | this._listeners.get(type).add(callback); | |
19 | } | |
e89eef94 | 20 | |
7b536961 | 21 | removeEventListener(type, callback) { |
11ef5354 JD |
22 | if (this._listeners.has(type)) { |
23 | this._listeners.get(type).delete(callback); | |
7b536961 | 24 | } |
7b536961 | 25 | } |
e89eef94 | 26 | |
7b536961 | 27 | dispatchEvent(event) { |
11ef5354 | 28 | if (!this._listeners.has(event.type)) { |
7b536961 PO |
29 | return true; |
30 | } | |
11ef5354 | 31 | this._listeners.get(event.type) |
667f3cc2 | 32 | .forEach(callback => callback.call(this, event)); |
7b536961 PO |
33 | return !event.defaultPrevented; |
34 | } | |
0e4808bf | 35 | } |