好,我的想法是使用ItemRenderer的子类来处理ROLL_OVER事件,并得到项目索引。默认情况下,TabBar项目渲染器是带有TabBarButtonSkin外观的ButtonBarButton类。而ButtonBarButton类具有itemIndex属性。让我们开始吧:
--->代码MyButtonBarItemRenderer.mxml
<?xml version="1.0" encoding="utf-8"?>
<s:ButtonBarButton xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
creationComplete="creationCompleteHandler(event)"
skinClass="spark.skins.spark.TabBarButtonSkin"
>
<fx:Script>
<![CDATA[
import events.MyTabBarEvent;
import mx.events.FlexEvent;
protected function creationCompleteHandler(event:FlexEvent):void
{
this.addEventListener(MouseEvent.ROLL_OVER, rollOverHandler);
}
private function rollOverHandler(e:MouseEvent) : void
{
var tbe:MyTabBarEvent = new MyTabBarEvent(MyTabBarEvent.ITEM_ROLL_OVER, true);
tbe.itemIndex = this.itemIndex;
dispatchEvent(tbe);
}
]]>
</fx:Script>
</s:ButtonBarButton>
这里我们使用自定义事件与ItemIndex属性:
--->代码放在MyTabBarEvent.as“事件包
package events
{
import flash.events.Event;
public class MyTabBarEvent extends Event
{
public static const ITEM_ROLL_OVER:String = "MyTabBarEvent.ItemRollOver";
public var itemIndex:int;
public function MyTabBarEvent(type:String, bubbles:Boolean=false, cancelable:Boolean=false)
{
super(type, bubbles, cancelable);
}
}
}
现在我们所要做的就是在我们的应用程序处理我们的自定义事件:
--->应用
<?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" minWidth="955" minHeight="600"
creationComplete="creationCompleteHandler(event)"
>
<fx:Declarations>
<!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<fx:Script>
<![CDATA[
import events.MyTabBarEvent;
import mx.events.FlexEvent;
protected function creationCompleteHandler(event:FlexEvent):void
{
tabBar.addEventListener(MyTabBarEvent.ITEM_ROLL_OVER, itemRollOverHandler);
}
protected function itemRollOverHandler(e:MyTabBarEvent) : void
{
trace ("Item " + e.itemIndex + " roll over event handled");
tabBar.selectedIndex = e.itemIndex;
}
]]>
</fx:Script>
<s:VGroup>
<s:TabBar id="tabBar" dataProvider="{viewstckId}" width="100%" itemRenderer="MyButtonBarItemRenderer"/>
<mx:ViewStack id="viewstckId">
<s:NavigatorContent label="Title 1">
<s:Panel title="title - 1"/>
</s:NavigatorContent >
<s:NavigatorContent label="Title 2">
<s:Panel title="title - 2"/>
</s:NavigatorContent>
<s:NavigatorContent label="Title 3">
<s:Panel title="title - 3"/>
</s:NavigatorContent>
</mx:ViewStack>
</s:VGroup>
</s:Application>
大卫感谢您的解决方案....现在为我工作... – Red 2011-03-14 18:57:39
我很高兴知道这一点。请接受答案,这样其他人可以节省时间。 – 2011-03-14 20:30:57