Flex 全局event

如果在flex开发中想用event来触发事件，相关component又离得很远，除了bind，还可以用全局event来触发。

 

1. 先定义一个event

package components.event
{
	import flash.events.Event;
	import flash.events.EventDispatcher;

	public class LogoutEvent extends Event
	{
		public static const LOG_OUT:String = "LogoutEvent";
		
		public static var dispatcher:EventDispatcher = new EventDispatcher();
		
		public function LogoutEvent()
		{
			super(LOG_OUT);
		}
		
	}
}

 2. 在需要监听的component中添加监听。

LogoutEvent.dispatcher.addEventListener(LogoutEvent.LOG_OUT, onLogout);


private function logout():void
{
	var obj:Object = GlobalParams.initParams("user", "logout");
	logoutService.url = "/logout"; 
	logoutService.send(obj);
}

 3. 发送event：

LogoutEvent.dispatcher.dispatchEvent(new LogoutEvent());

 

4. 如果改组件需要被关闭或者删除，一定记得在remove的时候，把这个listener remove掉。。否则可能会引起内存泄漏。。