Creating a bitmap fill on a Spark Application container control bar in Flex 4

The following example shows how you can set a bitmap fill on a Spark Application container control bar in Flex 4 by setting the skinClass style and using a BitmapFill.

The following example(s) require Flash Player 10 and the Adobe Flex 4 SDK. To download the Adobe Flash Builder 4 trial, see www.adobe.com/products/flex/. To download the latest nightly build of the Flex 4 SDK, see opensource.adobe.com/wiki/display/flexsdk/Download+Flex+4.

For more information on getting started with Flex 4 and Flash Builder 4, see the official Adobe Flex Team blog.

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2010/04/21/creating-a-bitmap-fill-on-a-spark-application-container-control-bar-in-flex-4/ -->
<s:Application name="Spark_Application_skinClass_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/mx"
        controlBarVisible="{chckBx.selected}"
        skinClass="skins.CustomApplicationSkin">
    <s:controlBarContent>
        <s:Button label="Control bar button" />
    </s:controlBarContent>
 
    <s:CheckBox id="chckBx"
            label="controlBarVisible"
            selected="true"
            left="20" top="20" />
 
</s:Application>

And the custom Spark Application skin, skins/CustomApplicationSkin.mxml, is as follows:

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2010/04/21/creating-a-bitmap-fill-on-a-spark-application-container-control-bar-in-flex-4/ -->
<s:Skin name="CustomApplicationSkin"
        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="0.5"
        alpha.disabledWithControlBar="0.5">
    <!-- states -->
    <s:states>
        <s:State name="normal" />
        <s:State name="disabled" />
        <s:State name="normalWithControlBar" />
        <s:State name="disabledWithControlBar" />
    </s:states>
 
    <fx:Metadata>
        [HostComponent("spark.components.Application")]
    </fx:Metadata> 
 
    <fx:Script fb:purpose="styling">
        <![CDATA[
            override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void {
                bgRectFill.color = getStyle("backgroundColor");
                super.updateDisplayList(unscaledWidth, unscaledHeight);
            }
        ]]>
    </fx:Script>
 
    <!-- 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>
            <s:SolidColor id="bgRectFill" color="#FFFFFF"/>
        </s:fill>
    </s:Rect>
 
    <s:Group left="0" right="0" top="0" bottom="0">
        <s:layout>
            <s:VerticalLayout gap="0" horizontalAlign="justify" />
        </s:layout>
 
        <!--- 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:BitmapFill source="@Embed('assets/pattern_143.gif')" fillMode="repeat" />
                </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 -->
            <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>
        <s:Group id="contentGroup" width="100%" height="100%" minWidth="0" minHeight="0" />
    </s:Group>
 
</s:Skin>

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View source is enabled in the following example.

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This entry is based on a beta version of the Flex 4 SDK and therefore is very likely to change as development of the Flex SDK continues. The API can (and will) change causing examples to possibly not compile in newer versions of the Flex 4 SDK.