Flex之自定义事件

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;

        }

    }

}