鼠标滚动事件DEMO（数字增加-）

<?xml version="1.0" encoding="utf-8"?>
<!--?http://blog.flexexamples.com/2007/08/28/detecting-the-mouse-scroll-wheel-in-a-flex-application/?-->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
??????? layout="vertical"
??????? verticalAlign="middle"
??????? backgroundColor="white"
??????? creationComplete="init()" viewSourceURL="srcview/index.html">

??? <mx:Script>
??????? <![CDATA[
??????????? private function init():void {
??????????????? systemManager.addEventListener(MouseEvent.MOUSE_WHEEL,doMouseWheel);?
??????????? }

??????????? private function doMouseWheel(evt:MouseEvent):void {
??????????????? num += evt.delta;
??????????? }
??????? ]]>
??? </mx:Script>
????
??? <mx:Number id="num">0</mx:Number>
????
??? <mx:NumberFormatter id="numberFormatter" />
????
??? <mx:ApplicationControlBar dock="true">
??????? <mx:Label text="Click the stage and scroll mouse wheel to begin." />
??? </mx:ApplicationControlBar>

??? <mx:Label text="{numberFormatter.format(num)}" ??????????? fontSize="96" /> </mx:Application>