本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/dengxingbo/archive/2009/12/14/5005154.aspx
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1、自定义组件
2、自定义事件
3、结合使用
一、自定义组件（使用的是Flex组件，ActionScript组件相对麻烦点，可视化差点）
该组件由一个TextArea和两个Button组成，如图：
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代码：
MyComponent.mxml
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01.<?xml version="1.0" encoding="utf-8"?>?
02.<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml" width="180" height="94" creationComplete="initComponent()">?
03.??? <mx:Metadata>?
04.??????? /**??
05.???????? * 1. 编译期间执行??
06.???????? * 2. 自定义组件一般可以通过dispatchEvent委派parent来处理某个事件，这就需要在parent中设置一个addEventLister来监听事件。??
07.???????? * 就像Button的Event.CLICK事件，除了可以通过addEventLister(Event.CLICK,clickHandle)来监听处理外，在Flex组件中还可以??
08.???????? * 直接 mx:Button click="clickHandle(event)" / 。怎么定义自定义组件也可以达到如此效果呢？??
09.???????? *? 2.1) 内部声明：[Event(name="commit",type ="laxino.MyEvent")]，type是指事件的类型（如1的类型是int,'aaa'的类型是String）,name是指??
10.???????? * Event中的构造函数中type。??
11.???????? *? 2.2) 外部使用：commit="commitHandle(myEvent)"是指为该组件注册了一个监听器，监听名字叫commit的事件，并通过commitHandle处理。事件的触发和??
12.???????? * 委派必须在组件内实现。??
13.???????? *???
14.???????? */??
15.???????????
16.???????? /**??
17.???????? *???
18.???????? * Using the Event metadata tag???
19.???????? * You use the [Event] metadata tag to define events dispatched by a component so that the Flex compiler can recognize???
20.???????? * them as MXML tag attributes in an MXML file. You add the [Event] metadata tag in one of the following locations:???
21.???????? * ActionScript components?? Above the class definition,but within the package definition,so that the events are bound???
22.???????? * to the class and not a particular member of the class.???
23.???????? * MXML components?? In the? mx:Metadata? tag of an MXML file.??
24.???????? *???
25.???????? */??
26.???????????
27.??????? [Event(name="commit",type ="laxino.MyEvent")]??
28.??????? [Event(name="preview",type ="laxino.MyEvent")]??
29.??? </mx:Metadata>?
30.??? <mx:Script>?
31.??????? <!--[CDATA[????
32.??????????? private function initComponent():void??
33.??????????? {??
34.??????????????????
35.??????????? }??
36.??????????????
37.??????????? private function preview(event:Event):void??
38.??????????? {??
39.??????????????? this.dispatchEvent(new MyEvent(MyEvent.PREVIEW,content.text));??
40.??????????? }??
41.??????????????
42.??????????? private function commitHandle(event:Event):void??
43.??????????? {??
44.??????????????? this.dispatchEvent(new MyEvent(MyEvent.COMMIT,content.text));??
45.??????????? }??
46.??????????????
47.??????? ]]-->?
48.??? </mx:Script>?
49.??? <mx:TextArea x="10" y="10" id="content"/>?
50.??? <mx:Button x="10" y="62" label="Preview" width="82" click="preview(event)"/>?
51.??? <mx:Button x="100" y="62" label="Commit" click="commitHandle(event)" />?
52.</mx:Canvas>?
<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml" width="180" height="94" creationComplete="initComponent()">
?<mx:Metadata>
??/**
?? * 1. 编译期间执行
?? * 2. 自定义组件一般可以通过dispatchEvent委派parent来处理某个事件，这就需要在parent中设置一个addEventLister来监听事件。
?? * 就像Button的Event.CLICK事件，除了可以通过addEventLister(Event.CLICK,clickHandle)来监听处理外，在Flex组件中还可以
?? * 直接 mx:Button click="clickHandle(event)" / 。怎么定义自定义组件也可以达到如此效果呢？
?? *? 2.1) 内部声明：[Event(name="commit",name是指
?? * Event中的构造函数中type。
?? *? 2.2) 外部使用：commit="commitHandle(myEvent)"是指为该组件注册了一个监听器，监听名字叫commit的事件，并通过commitHandle处理。事件的触发和
?? * 委派必须在组件内实现。
?? *
?? */
??
?? /**
?? *
?? * Using the Event metadata tag
?? * You use the [Event] metadata tag to define events dispatched by a component so that the Flex compiler can recognize
?? * them as MXML tag attributes in an MXML file. You add the [Event] metadata tag in one of the following locations:
?? * ActionScript components?? Above the class definition,so that the events are bound
?? * to the class and not a particular member of the class.
?? * MXML components?? In the? mx:Metadata? tag of an MXML file.
?? *
?? */
??
??????? [Event(name="commit",type ="laxino.MyEvent")]
??????? [Event(name="preview",type ="laxino.MyEvent")]
?</mx:Metadata>
?<mx:Script>
??<!--[CDATA[?
???private function initComponent():void
???{
????
???}
???
???private function preview(event:Event):void
???{
????this.dispatchEvent(new MyEvent(MyEvent.PREVIEW,content.text));
???}
???
???private function commitHandle(event:Event):void
???{
????this.dispatchEvent(new MyEvent(MyEvent.COMMIT,content.text));
???}
???
??]]-->
?</mx:Script>
?<mx:TextArea x="10" y="10" id="content"/>
?<mx:Button x="10" y="62" label="Preview" width="82" click="preview(event)"/>
?<mx:Button x="100" y="62" label="Commit" click="commitHandle(event)" />
</mx:Canvas>
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二、自定义事件
当按Button1时触发preview事件，点击Button2时触发commit事件，传输数据通过$data变量存储。
代码：
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01.package laxino??
02.{??
03.??? import flash.events.Event;??
04.?
05.??? public class MyEvent extends Event??
06.??? {??
07.??????? public static const COMMIT:String = "commit";??
08.??????? public static const PREVIEW:String = "preview";??
09.??????????
10.??????? private var $data:Object;??
11.??????????
12.??????? public function MyEvent(type:String,$data:Object=null,bubbles:Boolean=true,cancelable:Boolean=false)??
13.??????? {??
14.??????????? super(type,bubbles,cancelable);??
15.??????????? this.$data = $data;??
16.??????? }??
17.??????????
18.??????? public function get data():Object??
19.??????? {??
20.??????????? return $data;??
21.??????? }??
22.??????????
23.??????? public function set data($data:Object):void?
24.??????? {??
25.??????????? this.$data = $data;??
26.??????? }??
27.??? }??
28.}?
package laxino
{
?import flash.events.Event;
?public class MyEvent extends Event
?{
??public static const COMMIT:String = "commit";
??public static const PREVIEW:String = "preview";
??
??private var $data:Object;
??
??public function MyEvent(type:String,cancelable:Boolean=false)
??{
???super(type,cancelable);
???this.$data = $data;
??}
??
??public function get data():Object
??{
???return $data;
??}
??
??public function set data($data:Object):void
??{
???this.$data = $data;
??}
?}
}
三、使用。
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01.<?xml version="1.0" encoding="utf-8"?>?
02.<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" xmlns:cus="laxino.*" applicationComplete="initApp()">?
03.??? <mx:Script>?
04.??????? <!--[CDATA[??
05.??????????? import mx.controls.Alert;??
06.??????????? import laxino.MyEvent;??
07.??????????????
08.??????????? private function initApp():void??
09.??????????? {??
10.??????????????? // 方式一，监听preview事件??
11.??????????????? myComponent.addEventListener(MyEvent.PREVIEW,previewHandle);??
12.??????????? }??
13.??????????????
14.??????????? private function commitHandle(event:MyEvent):void??
15.??????????? {??
16.??????????????? result.text = event.data.toString();??
17.??????????? }??
18.??????????????
19.??????????? private function previewHandle(event:MyEvent):void??
20.??????????? {??
21.??????????????? Alert.show(event.data.toString(),"Preview");??
22.??????????? }??
23.??????? ]]-->?
24.??? </mx:Script>?
25.??? <mx:Label x="10" y="11" text="Custom Component"/>?
26.??? <!-- 方式二，监听commit事件 -->?
27.??? <cus:MyComponent id="myComponent" x="10" y="37" commit="commitHandle(event)" ></cus:MyComponent>?
28.??? <mx:Label x="10" y="139" text="Standard Component（Text）"/>?
29.??? <mx:Text id="result" x="10" y="165" text="Empty" width="180" height="123" />????
30.</mx:Application>?
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" xmlns:cus="laxino.*" applicationComplete="initApp()">
?<mx:Script>
??<!--[CDATA[
???import mx.controls.Alert;
???import laxino.MyEvent;
???
???private function initApp():void
???{
????// 方式一，监听preview事件
????myComponent.addEventListener(MyEvent.PREVIEW,previewHandle);
???}
???
???private function commitHandle(event:MyEvent):void
???{
????result.text = event.data.toString();
???}
???
???private function previewHandle(event:MyEvent):void
???{
????Alert.show(event.data.toString(),"Preview");
???}
??]]-->
?</mx:Script>
?<mx:Label x="10" y="11" text="Custom Component"/>
?<!-- 方式二，监听commit事件 -->
?<cus:MyComponent id="myComponent" x="10" y="37" commit="commitHandle(event)" ></cus:MyComponent>
?<mx:Label x="10" y="139" text="Standard Component（Text）"/>
?<mx:Text id="result" x="10" y="165" text="Empty" width="180" height="123" />?
</mx:Application>
?
有时候我们还需要加上一个自定义的EventDispatcher,通过继承EventDispatcher或实现IEventDispatcher接口。
最终结果，如图：
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本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/dengxingbo/archive/2009/12/14/5005154.aspx
