flex 自定义事件

EventTest.mxml

 

<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" xmlns:components="components.*"><mx:Script><!--[CDATA[import components.MyEventTest;import mx.controls.Alert;import components.ComponentForEvent;private function changeName(){cfe.changeName("新名称");} private function change(event:MyEventTest):void{ Alert.show(event.eventInfo +" log in."); }]]--></mx:Script><mx:Button id="testBtn" click="changeName()" label="测试"/><components:ComponentForEvent id="cfe" onChange="change(event)"/></mx:Application>

 

 

ComponentForEvent.as

 

package components{ //自定义组件import flash.events.EventDispatcher;//声明事件注册通道的方法；type是该事件的类[Event(name="onChange", type="components.MyEventTest")]public class ComponentForEvent extends EventDispatcher{private var name:String;public function changeName(newName:String){this.name=newName;dispatchEvent(new MyEventTest(MyEventTest.ONCHANGE));}public function get theName():String{return this.name;}public function set theName(name:String):void{this.name=name;}}}

 

MyEventTest.as

 

 package components{//自定义事件import mx.events.FlexEvent;public class MyEventTest extends FlexEvent{public static const ONCHANGE:String ="onChange";public var eventInfo:String;public function MyEventTest(s:String){super(s);//如果在构造时不设bubbles，默认是false，也就是不能传递的eventInfo="这个事件是："+s;}}}

 

上面是一个简单的例子，这里要注意以下几点：

1、[Event(name="onChange", type="components.MyEventTest")]这句不能少，否则会跳出错误

Cannot resolve attribute 'onChange' for component type components.MyEventTest.

2、[Event(name="onChange", type="components.MyEventTest")]中要注意event开头字母要大写，不然找不到event的