Creating a vertical application control bar on a Spark Application container in Flex 4

The following example shows how you can create a vertical application control bar on a Spark Application container in Flex 4 by creating a custom Application 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/2009/09/23/creating-a-vertical-application-control-bar-on-a-spark-application-container-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:layout>
        <s:VerticalLayout paddingLeft="20" paddingRight="20"
                paddingTop="20" paddingBottom="20" />
    </s:layout>
    <s:controlBarContent>
        <s:Button label="Button" />
        <s:CheckBox label="CheckBox" />
        <s:RadioButton label="RadioButton" />
        <s:RadioButton label="RadioButton" />
        <s:RadioButton label="RadioButton" />
    </s:controlBarContent>
 
    <mx:ColorPicker />
    <mx:DateChooser />
 
</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/2009/09/23/creating-a-vertical-application-control-bar-on-a-spark-application-container-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>
    <![CDATA[
        [HostComponent("spark.components.Application")]
    ]]>
    </fx:Metadata>
 
    <!-- fill -->
    <s:Rect id="backgroundRect" left="0" right="0" top="0" bottom="0"  >
        <s:fill>
            <s:SolidColor color="{getStyle('backgroundColor')}" />
        </s:fill>
    </s:Rect>
 
    <s:Group left="0" right="0" top="0" bottom="0">
        <s:layout>
            <s:HorizontalLayout gap="0" verticalAlign="justify" />
        </s:layout>
 
        <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  right="0" top="0" bottom="0" width="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:VerticalLayout 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>

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.