最近在做地图JS和FLEX的封装工作，flex封装需要用到自定义事件这方面知识，在这里就简单介绍一下FLEX自定义事件。 自定义事件必须注意几点： （1）自定义事件通过继承Event类来实现。 （2）自定义事件不可以自己触发，只能有系统事件派发。 首先我们新建一个ActionScript 类，这个类继承flash.events.Event。 复制代码 代码如下: package { import flash.events.Event; public class MyEvent extends Event { public static const myEvent:String=\”myEvent\”; public var data:*; public function MyEvent(type:String,bubbles:Boolean=false,cancellabel:Boolean=false,data:* = null) { super(type,false,false); this.data = data; } override public function clone():Event{ return new MyEvent(myEvent,false,false,data); } override public function toString():String{ return formatToString(\”MyEvent\”); } } } 创建一个组件来监听事件，实现数据的接受。 component.mxml 复制代码 代码如下: <?xml version=\”1.0\” encoding=\”utf-8\”?> <s:Group xmlns:fx=\”http://ns.adobe.com/mxml/2009\” xmlns:s=\”library://ns.adobe.com/flex/spark\” xmlns:mx=\”library://ns.adobe.com/flex/mx\” width=\”100%\” height=\”100%\” initialize=\”init()\”> <s:layout> <s:BasicLayout/> </s:layout> <fx:Script> <![CDATA[ import mx.controls.Alert; import mx.events.FlexEvent; public var ff:FlexMyEvent; public function init():void{ ff = this.parentDocument as FlexMyEvent; ff.addEventListener(MyEvent.myEvent,myEventHandler);//监听事件 } public function myEventHandler(eve:Object):void{ inpu.text = eve.data; Alert.show(\”事件触发，\”+eve.data); } ]]> </fx:Script> <fx:Declarations> <!– 将非可视元素（例如服务、值对象）放在此处 –> </fx:Declarations> <s:Panel width=\”100%\” height=\”100%\” backgroundColor=\”#E7D4DD\”> <s:TextInput id=\”inpu\”> </s:TextInput> </s:Panel> </s:Group> 主程序 FlexMyEvent.mxml 复制代码 代码如下: <?xml version=\”1.0\” encoding=\”utf-8\”?> <s:Application xmlns:fx=\”http://ns.adobe.com/mxml/2009\” xmlns:s=\”library://ns.adobe.com/flex/spark\” xmlns:mx=\”library://ns.adobe.com/flex/mx\” xmlns:comp = \”*\” width=\”100%\” height=\”100%\”> <fx:Script> <![CDATA[ import flash.external.ExternalInterface; import flash.system.Security; import mx.controls.Alert; import mx.events.FlexEvent; public var callBackInfo:String = \”\”; public function doSend():void{ callBackInfo = input.text; var myEve:MyEvent = new MyEvent(MyEvent.myEvent,false,false,callBackInfo);//派发事件 myEve.data is Object; this.dispatchEvent(myEve); } ]]> </fx:Script> <fx:Declarations> <!– 将非可视元素（例如服务、值对象）放在此处 –> </fx:Declarations> <mx:HBox width=\”100%\” height=\”100%\” horizontalAlign=\”center\” verticalAlign=\”middle\”> <s:Panel width=\”100%\” height=\”100%\”> <mx:HBox paddingLeft=\”5\” width=\”100%\” height=\”100%\”> <s:TextInput id=\”input\” text=\”Send Hello\”> </s:TextInput> <s:Button label=\”Send\” click=\”doSend()\”> </s:Button> </mx:HBox> </s:Panel> <comp:Component> </comp:Component> </mx:HBox> </s:Application> 
