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flex 自定义事件

news 来源：原创 2024/5/3 11:37:25

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>  </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