Side by Side Diff: lib/events.js
Issue 29339020:
Issue 3868 - Use the new FilterNotifier API (Closed)
Patch Set: Updated depdendencies and use EventEmitter.listeners()
Created March 24, 2016, 3:29 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._listeners = Object.create(null); | |
| 30 }; | |
| 31 | |
| 32 exports.EventEmitter.prototype = { | |
| 33 /** | |
| 34 * Adds a listener for the specified event name. | |
| 35 * | |
| 36 * @param {string} name | |
| 37 * @param {function} listener | |
| 38 */ | |
| 39 on: function(name, listener) | |
| 40 { | |
| 41 if (name in this._listeners) | |
| 42 this._listeners[name].push(listener); | |
| 43 else | |
| 44 this._listeners[name] = [listener]; | |
| 45 }, | |
| 46 | |
| 47 /** | |
| 48 * Removes a listener for the specified event name. | |
| 49 * | |
| 50 * @param {string} name | |
| 51 * @param {function} listener | |
| 52 */ | |
| 53 off: function(name, listener) | |
| 54 { | |
| 55 let listeners = this._listeners[name]; | |
| 56 if (listeners) | |
| 57 { | |
| 58 let idx = listeners.indexOf(listener); | |
| 59 if (idx != -1) | |
| 60 listeners.splice(idx, 1); | |
| 61 } | |
| 62 }, | |
| 63 | |
| 64 /** | |
| 65 * Calls all previously added listeners for the given event name. | |
| 66 * | |
| 67 * @param {string} name | |
| 68 * @param {...*} [arg] | |
| 69 */ | |
| 70 emit: function(name) | |
| 71 { | |
| 72 let listeners = this._listeners[name]; | |
| 73 if (listeners) | |
| 74 { | |
| 75 let args = []; | |
| 76 for (let i = 1; i < arguments.length; i++) | |
| 77 args.push(arguments[i]); | |
| 78 | |
| 79 let currentListeners = listeners.slice(); | |
| 80 for (let listener of currentListeners) | |
| 81 listener.apply(null, args); | |
| 82 } | |
| 83 } | |
| 84 }; | |
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