75 lines
2.1 KiB
JavaScript
75 lines
2.1 KiB
JavaScript
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define(function(require) {
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// Based on https://github.com/diy/intercom.js/blob/master/lib/events.js
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// Copyright 2012 DIY Co Apache License, Version 2.0
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// http://www.apache.org/licenses/LICENSE-2.0
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function removeItem(item, array) {
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for (var i = array.length - 1; i >= 0; i--) {
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if (array[i] === item) {
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array.splice(i, 1);
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}
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}
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return array;
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}
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var EventEmitter = function() {};
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EventEmitter.createInterface = function(space) {
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var methods = {};
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methods.on = function(name, fn) {
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if (typeof this[space] === 'undefined') {
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this[space] = {};
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}
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if (!this[space].hasOwnProperty(name)) {
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this[space][name] = [];
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}
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this[space][name].push(fn);
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};
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methods.off = function(name, fn) {
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if (typeof this[space] === 'undefined') return;
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if (this[space].hasOwnProperty(name)) {
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removeItem(fn, this[space][name]);
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}
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};
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methods.trigger = function(name) {
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if (typeof this[space] !== 'undefined' && this[space].hasOwnProperty(name)) {
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var args = Array.prototype.slice.call(arguments, 1);
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for (var i = 0; i < this[space][name].length; i++) {
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this[space][name][i].apply(this[space][name][i], args);
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}
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}
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};
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methods.removeAllListeners = function(name) {
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if (typeof this[space] === 'undefined') return;
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var self = this;
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self[space][name].forEach(function(fn) {
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self.off(name, fn);
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});
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};
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return methods;
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};
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var pvt = EventEmitter.createInterface('_handlers');
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EventEmitter.prototype._on = pvt.on;
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EventEmitter.prototype._off = pvt.off;
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EventEmitter.prototype._trigger = pvt.trigger;
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var pub = EventEmitter.createInterface('handlers');
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EventEmitter.prototype.on = function() {
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pub.on.apply(this, arguments);
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Array.prototype.unshift.call(arguments, 'on');
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this._trigger.apply(this, arguments);
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};
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EventEmitter.prototype.off = pub.off;
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EventEmitter.prototype.trigger = pub.trigger;
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EventEmitter.prototype.removeAllListeners = pub.removeAllListeners;
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return EventEmitter;
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});
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