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| (function(Events) { | |
| var _listeners = {}; | |
| Events.proxy = function(event, handler) { | |
| var proxyHandler = function(context) { | |
| Events.removeEventListener(event, proxyHandler); | |
| handler(context); | |
| }; | |
| return proxyHandler; | |
| } | |
| Events.addEventListener = function(event, handler) { | |
| _listeners[event] = _listeners[event] || []; | |
| _listeners[event].push(handler); | |
| }; | |
| Events.addWait = function(condition, event, handler) { | |
| if (condition()) { | |
| handler(); | |
| return; | |
| } | |
| Events.addEventListener(event, Events.proxy(event, handler)); | |
| }; | |
| Events.removeEventListener = function(event, handler) { | |
| var len = _getListeners(event).length; | |
| for (var i = len; i >= 0; i--) { | |
| if (_listeners[event][i] === handler) { | |
| _listeners[event].splice(i, 1); | |
| } | |
| } | |
| }; | |
| Events.dispatchEvent = function(event, context) { | |
| if (_listeners.hasOwnProperty(event)) { | |
| var listeners = _listeners[event].slice(0); | |
| for (var i = 0; i < listeners.length; i++) { | |
| listeners[i](context); | |
| } | |
| } | |
| }; | |
| _getListeners = function(event) { | |
| return _listeners[event] || []; | |
| } | |
| })(window.Events = window.Events || {}); |
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