flex 4 透明窗体实例

flex 4使用flash builder 4开发。为了能够让网页上显示的flash透明，主要是承载（html）文件中在object中加入

 <param name="wmode" value="transparent">

 在对flex要加入皮肤文件ApplicationSkin.mxml

<?xml version="1.0" encoding="utf-8"?>

<!--

ADOBE SYSTEMS INCORPORATED
Copyright 2008 Adobe Systems Incorporated
All Rights Reserved.

NOTICE: Adobe permits you to use, modify, and distribute this file
in accordance with the terms of the license agreement accompanying it.

-->

<!--- The default skin class for the Spark Application component. 

@see spark.components.Application

@langversion 3.0
@playerversion Flash 10
@playerversion AIR 1.5
@productversion Flex 4
-->
<s:Skin xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:fb="http://ns.adobe.com/flashbuilder/2009" alpha.disabled="0" alpha.disabledWithControlBar="0"
        >
    
    <fx:Metadata>
        <![CDATA[ 
        /** 
        * A strongly typed property that references the component to which this skin is applied.
        */
        [HostComponent("spark.components.Application")]
        ]]>
    </fx:Metadata> 
    
    <fx:Script fb:purpose="styling">
        <![CDATA[
            /**
             *  @private
             */
            override protected function updateDisplayList(unscaledWidth:Number, 
                                                          unscaledHeight:Number) : void
            {
                bgRectFill.color = getStyle('backgroundColor');
                super.updateDisplayList(unscaledWidth, unscaledHeight);
            }
        ]]>
    </fx:Script>
    
    <s:states>
        <s:State name="normal" />
        <s:State name="disabled" />
        <s:State name="normalWithControlBar" />
        <s:State name="disabledWithControlBar" />
    </s:states>
    
    <!-- fill -->
    <!--- 
    A rectangle with a solid color fill that forms the background of the application.
    The color of the fill is set to the Application's backgroundColor property.
    -->
    <s:Rect id="backgroundRect" left="0" right="0" top="0" bottom="0"  >
        <s:fill>
            <!--- @private -->
            <s:SolidColor id="bgRectFill" color="#FFFFFF" alpha="0"/>
            <!--/*这一步是透明的关键*/-->
        </s:fill>
    </s:Rect>
    
    <s:Group left="0" right="0" top="0" bottom="0">
        <s:layout>
            <s:VerticalLayout gap="0" horizontalAlign="justify" />
        </s:layout>
        
        <!--- 
        @private
        Application Control Bar
        -->
        <s:Group id="topGroup" minWidth="0" minHeight="0"
                 includeIn="normalWithControlBar, disabledWithControlBar" >
            
            <!-- layer 0: control bar highlight -->
            <s:Rect left="0" right="0" top="0" bottom="1" >
                <s:stroke>
                    <s:LinearGradientStroke rotation="90" weight="1">
                        <s:GradientEntry color="0xFFFFFF" />
                        <s:GradientEntry color="0xD8D8D8" />
                    </s:LinearGradientStroke>
                </s:stroke>
            </s:Rect>
            
            <!-- layer 1: control bar fill -->
            <s:Rect left="1" right="1" top="1" bottom="2" >
                <s:fill>
                    <s:LinearGradient rotation="90">
                        <s:GradientEntry color="0xEDEDED" />
                        <s:GradientEntry color="0xCDCDCD" />
                    </s:LinearGradient>
                </s:fill>
            </s:Rect>
            
            <!-- layer 2: control bar divider line -->
            <s:Rect left="0" right="0" bottom="0" height="1" alpha="0.55">
                <s:fill>
                    <s:SolidColor color="0x000000" />
                </s:fill>
            </s:Rect>
            
            <!-- layer 3: control bar -->
            <!--- @copy spark.components.Application#controlBarGroup -->
            <s:Group id="controlBarGroup" left="0" right="0" top="1" bottom="1" minWidth="0" minHeight="0">
                <s:layout>
                    <s:HorizontalLayout paddingLeft="10" paddingRight="10" paddingTop="7" paddingBottom="7" gap="10" />
                </s:layout>
            </s:Group>
        </s:Group>
        
        <!--- @copy spark.components.SkinnableContainer#contentGroup -->
        <s:Group id="contentGroup" width="100%" height="100%" minWidth="0" minHeight="0" />
        
    </s:Group>
    
</s:Skin>

 

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