Flex 4中如何给Panel设置bitmap填充背景色的例子

接下来的例子演示了Flex 4中如何通过BitmapFill和LinearGradient，给Panel设置bitmap填充背景色。

下面是main.mxml：

<?xml version="1.0" encoding="utf-8"?> 
<s:Application name="Spark_Panel_fill_BitmapFill_test" 
        xmlns:fx="http://ns.adobe.com/mxml/2009" 
        xmlns:s="library://ns.adobe.com/flex/spark" 
        xmlns:mx="library://ns.adobe.com/flex/halo"> 
  
    <mx:ApplicationControlBar width="100%" cornerRadius="0"> 
        <mx:Form styleName="plain"> 
            <mx:FormItem label="rotation:"> 
                <s:HSlider id="rotationSlider" 
                        minimum="-360" 
                        maximum="360" 
                        value="90" 
                        liveDragging="true" 
                        width="{pnl.width}" /> 
            </mx:FormItem> 
            <mx:FormItem label="ratio:"> 
                <s:HSlider id="ratioSlider" 
                        minimum="0.0" 
                        maximum="1.0" 
                        value="0.2" 
                        valueInterval="0.05" 
                        liveDragging="true" 
                        width="{pnl.width}" /> 
            </mx:FormItem> 
        </mx:Form> 
    </mx:ApplicationControlBar> 
  
    <s:Panel id="pnl" 
            title="Spark Panel title" 
            width="320" height="240" 
            horizontalCenter="0" verticalCenter="0"> 
        <s:Rect width="100%" height="100%"> 
            <s:fill> 
                <s:BitmapFill source="@Embed('assets/pattern_140.gif')" /> 
            </s:fill> 
        </s:Rect> 
        <s:Rect width="100%" height="100%"> 
            <s:fill> 
                <s:LinearGradient rotation="{rotationSlider.value}"> 
                    <s:GradientEntry color="white" 
                            alpha="0.0" 
                            ratio="0.0" /> 
                    <s:GradientEntry color="#F0EBD2" 
                            alpha="1.0" 
                            ratio="{ratioSlider.value}" /> 
                </s:LinearGradient> 
            </s:fill> 
        </s:Rect> 
        <s:TextArea id="textArea" 
                verticalScrollPolicy="on" 
                left="20" right="20" 
                top="20" bottom="20"> 
            <s:text>The quick brown fox jumps over the lazy dog.</s:text> 
        </s:TextArea> 
    </s:Panel> 
  
</s:Application>