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Issue 29338534: Issue 3826 - Filter preference change events (Closed)
Patch Set: Fixed typo in comment Created March 18, 2016, 6:15 p.m.
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1 /*
2 * This file is part of Adblock Plus <https://adblockplus.org/>,
3 * Copyright (C) 2006-2016 Eyeo GmbH
4 *
5 * Adblock Plus is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 3 as
7 * published by the Free Software Foundation.
8 *
9 * Adblock Plus is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with Adblock Plus. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18 /** @module events */
19
20 "use strict";
21
22 /**
23 * Registers and emits names events.
24 *
25 * @constructor
26 */
27 exports.EventEmitter = function()
28 {
29 this._callbacks = Object.create(null);
30 };
31
32 exports.EventEmitter.prototype = {
33 /**
34 * Adds a callback for the specified event name.
35 *
36 * @param {string} name
37 * @param {function} callback
38 */
39 on: function(name, callback)
40 {
41 if (name in this._callbacks)
42 this._callbacks[name].push(callback);
43 else
44 this._callbacks[name] = [callback];
45 },
46
47 /**
48 * Removes a callback for the specified event name.
49 *
50 * @param {string} name
51 * @param {function} callback
52 */
53 off: function(name, callback)
54 {
55 let callbacks = this._callbacks[name];
56 if (callbacks)
57 {
58 let idx = callbacks.indexOf(callback);
59 if (idx != -1)
60 callbacks.splice(idx, 1);
61 }
62 },
63
64 /**
65 * Calls all previously added callbacks for the given event name.
66 *
67 * @param {string} name
68 * @param {...*} [arg]
69 */
70 emit: function(name)
71 {
72 let callbacks = this._callbacks[name];
73 if (callbacks)
74 {
75 for (let callback of callbacks)
76 callbacks.apply(null, Array.prototype.slice.call(arguments, 1));
77 }
78 }
79 };
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