Adding a gradient background to a Spark Application container control bar in Flex 4

The following example shows how you can create a gradient background Spark Application control bar in Flex 4 by creating a custom skin and setting the skinClass style.

Full code after the jump.

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/2009/09/03/adding-a-gradient-background-to-a-spark-application-container-control-bar-in-flex-4/ -->
<s:Application name="Spark_Application_skinClass_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"
        skinClass="skins.CustomApplicationSkin">
    <s:controlBarContent>
        <s:RichText text="color:" />
        <mx:ColorPicker id="colorPicker" />
    </s:controlBarContent>
    <s:controlBarLayout>
        <s:HorizontalLayout verticalAlign="middle"
                paddingLeft="10" paddingRight="10"
                paddingTop="10" paddingBottom="10" />
    </s:controlBarLayout>
 
    <s:RichEditableText id="sdkVer"
            color="{colorPicker.selectedColor}"
            editable="false" selectable="false"
            fontSize="96"
            horizontalCenter="0" verticalCenter="0"
            creationComplete="sdkVer.text = mx_internal::VERSION;" />
 
</s:Application>

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

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2009/09/03/adding-a-gradient-background-to-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"
        alpha.disabled="0.5" >
    <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>
 
    <!-- 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 color="{hostComponent.backgroundColor as uint}" />
        </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 background -->
            <s:Rect left="0" right="0" bottom="0" top="1" rotation="90">
                <s:fill>
                    <s:LinearGradient>
                        <s:GradientEntry color="white" />
                        <s:GradientEntry color="haloSilver" />
                    </s:LinearGradient>
                </s:fill>
            </s:Rect>
 
            <!-- layer 1: control bar divider line -->
            <s:Rect left="0" right="0" top="0" height="1" >
                <s:fill>
                    <s:SolidColor color="0xCDCDCD" />
                </s:fill>
            </s:Rect>
 
            <!-- layer 2: control bar -->
            <s:Group id="controlBarGroup" left="0" right="0" top="1" bottom="0" minWidth="0" minHeight="0">
                <s:layout>
                    <s:HorizontalLayout paddingLeft="10" paddingRight="10" paddingTop="10" paddingBottom="10" />
                </s:layout>
            </s:Group>
        </s:Group>
 
        <s:Group id="contentGroup" width="100%" height="100%" minWidth="0" minHeight="0" />
    </s:Group>
 
</s:Skin>

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.

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