56 lines
1.5 KiB
JavaScript
56 lines
1.5 KiB
JavaScript
/*
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* ***** BEGIN LICENSE BLOCK *****
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* Copyright (c) 2011-2012 VMware, Inc.
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*
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* For the license see COPYING.
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* ***** END LICENSE BLOCK *****
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*/
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/* Simplified implementation of DOM2 EventTarget.
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* http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-EventTarget
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*/
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var REventTarget = function() {};
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REventTarget.prototype.addEventListener = function (eventType, listener) {
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if(!this._listeners) {
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this._listeners = {};
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}
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if(!(eventType in this._listeners)) {
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this._listeners[eventType] = [];
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}
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var arr = this._listeners[eventType];
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if(utils.arrIndexOf(arr, listener) === -1) {
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arr.push(listener);
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}
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return;
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};
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REventTarget.prototype.removeEventListener = function (eventType, listener) {
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if(!(this._listeners && (eventType in this._listeners))) {
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return;
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}
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var arr = this._listeners[eventType];
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var idx = utils.arrIndexOf(arr, listener);
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if (idx !== -1) {
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if(arr.length > 1) {
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this._listeners[eventType] = arr.slice(0, idx).concat( arr.slice(idx+1) );
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} else {
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delete this._listeners[eventType];
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}
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return;
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}
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return;
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};
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REventTarget.prototype.dispatchEvent = function (event) {
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var t = event.type;
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var args = Array.prototype.slice.call(arguments, 0);
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if (this['on'+t]) {
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this['on'+t].apply(this, args);
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}
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if (this._listeners && t in this._listeners) {
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for(var i=0; i < this._listeners[t].length; i++) {
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this._listeners[t][i].apply(this, args);
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}
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}
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};
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