Created
October 8, 2012 12:20
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EventDispatcher
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| /** | |
| * @constructor | |
| * @class | |
| * @extend Object | |
| */ | |
| function EventDispatcher() { | |
| } | |
| /** | |
| * Eventを格納するオブジェクト | |
| */ | |
| EventDispatcher.prototype.events = {} | |
| /** | |
| * @param {string} type | |
| * @return {boolean} | |
| */ | |
| EventDispatcher.prototype.hasEventListener = function (type) { | |
| return this.events.hasOwnProperty(type); | |
| } | |
| /** | |
| * @param {string} type | |
| * @param {function} handler | |
| * @return {boolean} | |
| */ | |
| EventDispatcher.prototype.removeEventListener = function (type, handler) { | |
| if (!this.hasEventListener(type)) return false; | |
| var handlers = this.events[type]; | |
| for (var i = 0; i < handlers.length; i++) { | |
| if (handlers[i] != handler) continue; | |
| handlers.splice(i, 1); | |
| handlers.length == 0 && delete this.events[type]; | |
| return true; | |
| } | |
| return false; | |
| } | |
| /** | |
| * @param {string} type | |
| * @param {function} handler | |
| * @return {void} | |
| */ | |
| EventDispatcher.prototype.addEventListener = function(type, handler) { | |
| if (typeof handler != 'function') return; | |
| this.hasEventListener(type) || (this.events[type] = []); | |
| this.events[type].push(handler); | |
| }; | |
| /** | |
| * @param {string} type | |
| * @return {void} | |
| */ | |
| EventDispatcher.prototype.dispatchEvent = function(type) { | |
| if (!this.hasEventListener(type)) return; | |
| var handlers = this.events[type]; | |
| for (var i = 0; i < handlers.length; i++) { | |
| handlers[i].call(); | |
| } | |
| }; |
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