限制titlewindow窗口拖出主应用程序之外

<?xml version="1.0" encoding="utf-8"?><!-- http://blog.flexexamples.com/2010/01/20/constraining-the-movement-on-a-spark-titlewindow-container-in-flex-4/ --><s:Application name="Spark_TitleWindow_windowMoving_afterBounds_test"        xmlns:fx="http://ns.adobe.com/mxml/2009"         xmlns:s="library://ns.adobe.com/flex/spark">    <s:controlBarContent>        <s:Button id="btn"                label="Launch TitleWindow"                click="btn_clickHandler(event);" />    </s:controlBarContent>?    <fx:Script>        <![CDATA[            import mx.core.UIComponent;            import mx.events.CloseEvent;            import mx.managers.PopUpManager;            import spark.events.TitleWindowBoundsEvent;?            protected function titleWin_closeHandler(evt:CloseEvent):void {                PopUpManager.removePopUp(evt.currentTarget as UIComponent);            }?            protected function btn_clickHandler(evt:MouseEvent):void {                PopUpManager.addPopUp(titleWin, this, true);                PopUpManager.centerPopUp(titleWin);            }?            protected function titleWin_windowMovingHandler(evt:TitleWindowBoundsEvent):void {                if (evt.afterBounds.left < 0) {                    evt.afterBounds.left = 0;                } else if (evt.afterBounds.right > systemManager.stage.stageWidth) {                    evt.afterBounds.left = systemManager.stage.stageWidth - evt.afterBounds.width;                }                if (evt.afterBounds.top < 0) {                    evt.afterBounds.top = 0;                } else if (evt.afterBounds.bottom > systemManager.stage.stageHeight) {                    evt.afterBounds.top = systemManager.stage.stageHeight - evt.afterBounds.height;                }            }        ]]>    </fx:Script>?    <fx:Declarations>        <s:TitleWindow id="titleWin"                title="Spark TitleWindow"                width="300"                close="titleWin_closeHandler(event);"                windowMoving="titleWin_windowMovingHandler(event);">            <s:layout>                <s:VerticalLayout paddingLeft="10" paddingRight="10"                        paddingTop="10" paddingBottom="10" />            </s:layout>            <s:Label text="The quick brown fox jumps over the lazy dog."                    fontSize="24"                    width="100%"/>        </s:TitleWindow>    </fx:Declarations>?</s:Application>

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主要的设置方法见代码中粗体部分、、、

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from:http://blog.flexexamples.com/2010/01/20/constraining-the-movement-on-a-spark-titlewindow-container-in-flex-4/

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