itemrenderer与父容器之间的交互，调用

转自他文，并做适当删除修改!

在项目渲染器访问主调用应用中的成员，可用parentDocument来引用；

主调用应用要访问项目渲染器中的成员，一般都是通过在项目渲染器先派发事件，然后在主调用应用中注册事件侦听器来实现。

例如：在项目渲染器中点击图片事件，然后通知主调用应用

<mx:Image click="this.parentDocument.imgclick(event)"
                  data="{data.label}" source="assets\tx.JPG" width="40"/>

在主调用应用中定义：

public function imgclick(evt:MouseEvent):void
{
    var img:Image=evt.currentTarget as Image;
    Alert.show(img.data.toString());
}

记住得是public的,不同类之间是无法访问私有方法的


其实上面的功能也可以用dispatchEvent来实现

先定义一个事件类

package
{
    import flash.events.Event;
    public class myEvent extends Event
    {
        public var data:String;
        public function myEvent(type:String, bubbles:Boolean=false, cancelable:Boolean=false,data:String="")
        {
            super(type, bubbles, cancelable);
            this.data=data;
        }
    }
}

然后在itemh中将事件调度到事件流中

<mx:Image click="clickHandler(event)"
          data="{data.label}" source="assets\tx.JPG" width="40"/>

private function clickHandler(evt:MouseEvent):void
{
    var img:Image=evt.currentTarget as Image;
    dispatchEvent(new  myEvent("img_click",true,true,img.data.toString()));
}

最后在主调应用中监听事件

private function initTileList():void
{
    this.tlist.addEventListener("img_click",onItemimg_click);
}

private function onItemimg_click(evt:myEvent):void
{
    Alert.show(evt.data);
}

<mx:TileList id="tlist" maxColumns="1" x="34" y="10" width="148"
    dataProvider="{arrColl_keySetup}" itemRenderer="itemh"
    creationComplete="initTileList()">
</mx:TileList>

其实也可以用<mx:itemRenderer>和<mx:Component>标签来声明itemRenderer

例如以上代码可以改为：

<mx:Script>
    <![CDATA[
        import mx.controls.Image;
        import mx.controls.Alert;

        public function imgclick(evt:MouseEvent):void
        {
            var img:Image=evt.currentTarget as Image;

            Alert.show(img.data.toString());
        }
    ]]>
</mx:Script>

<mx:ArrayCollection id="arrColl_keySetup">
    <mx:source>
        <mx:Array id="arr_keysetup">
            <mx:Object data="00" sel="false" label="aaa"/>
            <mx:Object data="11" sel="false" label="bbb"/>
            <mx:Object data="22" sel="true" label="ccc"/>
        </mx:Array>
    </mx:source>
</mx:ArrayCollection>

<mx:TileList id="tlist" maxColumns="1"
             dataProvider="{arrColl_keySetup}" 
             x="34" y="10" width="148">
    <mx:itemRenderer>
        <mx:Component>
            <mx:HBox width="145" height="41" horizontalScrollPolicy="off" verticalScrollPolicy="off">
                <mx:VBox width="40" height="100%" horizontalScrollPolicy="off" verticalScrollPolicy="off">
                    <mx:Image click="this.parentDocument.imgclick(event)"
                        data="{data.label}" buttonMode="true" source="assets\tx.JPG" width="40"/>
                </mx:VBox>
                <mx:VBox width="95" height="100%" horizontalScrollPolicy="off" verticalScrollPolicy="off">
                    <mx:Label text="{data.label}" toolTip="{data.label}"/>
                    <mx:Image toolTip="点我查看视频" buttonMode="true"
                        source="assets\camera.JPG" width="16" height="20"/>
                </mx:VBox>
            </mx:HBox>
        </mx:Component>
    </mx:itemRenderer>
</mx:TileList>



本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/dream8062/archive/2009/02/27/3941087.aspx