Flex之自定义事件

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1、通过dispatchEvent委托事件模式完成自定义事件：

<?xml version="1.0" encoding="utf-8"?><s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"                creationComplete="application1_creationCompleteHandler()"               xmlns:s="library://ns.adobe.com/flex/spark"                xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">        <fx:Declarations>        <!-- 将非可视元素（例如服务、值对象）放在此处 -->    </fx:Declarations>    <fx:Script>        <![CDATA[            import mx.controls.Alert;            import mx.events.FlexEvent;            import mx.messaging.events.MessageEvent;                        protected function application1_creationCompleteHandler():void            {                this.addEventListener("Clicked",clickedHandler);                    Alert.show(" creationComplete ","提示");            }                        private function clickedHandler(e:Event):void{                Alert.show("事件响应","提示");                        }            protected function button1_clickHandler():void            {                dispatchEvent(new Event("Clicked"));                Alert.show(" click ","提示");            }        ]]>    </fx:Script>    <fx:Metadata>        [Event(name="Clicked",type="flash.events.Event")]    </fx:Metadata>    <s:Button x="102" y="29" label="按钮" enabled="true" width="85" height="35" click="button1_clickHandler()" /></s:Application>

2、通过继承Event类是实现自定义事件：

<?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" creationComplete="application1_creationCompleteHandler(event)"               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">    <s:layout>        <s:BasicLayout/>    </s:layout>    <fx:Script>        <![CDATA[            import com.flex.event.MyEvent;                        import mx.controls.Alert;            import mx.events.FlexEvent;            protected function application1_creationCompleteHandler(event:FlexEvent):void            {                this.addEventListener(MyEvent.MYEVENT,eventHindler);            }            //自定义函数              private function eventHindler(e:MyEvent):void{                Alert.show("事件响应结果："+e.getEventObj(),"提示");                        }            protected function button1_clickHandler(event:MouseEvent):void            {                var evt:MyEvent = new MyEvent(MyEvent.MYEVENT,122);                dispatchEvent(evt); //将事件发送出去                           }        ]]>    </fx:Script>    <fx:Declarations>            </fx:Declarations>    <s:Button x="93" y="59" label="click me" click="button1_clickHandler(event)"/></s:Application>

　　MyEvent类定义：

package com.flex.event{    import flash.events.Event;            public class MyEvent extends Event    {        public static const MYEVENT:String="myevent";        private var eventObj:int;        public function MyEvent(type:String, i:int,bubbles:Boolean=false, cancelable:Boolean=false)        {            super(type, bubbles, cancelable);            this.eventObj=i;        }        public function getEventObj():int{            return this.eventObj;        }    }}

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