Setting the content background color on the Spark List control in Flex 4

The following example shows how you can set the content background color on the Spark List control in Flex 4 by setting the contentBackgroundColor style.

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/2009/02/23/setting-the-content-background-color-on-the-fxlist-control-in-flex-gumbo/ -->
<s:Application name="Spark_List_contentBackgroundColor_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">
    <s:controlBarContent>
        <mx:Form>
            <mx:FormItem label="contentBackgroundColor:">
                <mx:ColorPicker id="colorPicker"
                        selectedColor="white" />
            </mx:FormItem>
            <mx:FormItem label="enabled:">
                <s:CheckBox id="checkBox"
                        selected="true" />
            </mx:FormItem>
        </mx:Form>
    </s:controlBarContent>
 
    <s:List id="list"
            contentBackgroundColor="{colorPicker.selectedColor}"
            enabled="{checkBox.selected}"
            horizontalCenter="0" verticalCenter="0">
        <s:dataProvider>
            <s:ArrayList source="[One,Two,Three,Four,Five,Six]" />
        </s:dataProvider>
    </s:List>
 
</s:Application>

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View source is enabled in the following example.

You can also set the contentBackgroundColor style in an external .CSS file or <Style> block, as seen in the following example:

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2009/02/23/setting-the-content-background-color-on-the-fxlist-control-in-flex-gumbo/ -->
<s:Application name="Spark_List_contentBackgroundColor_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">
    <s:controlBarContent>
        <mx:Form>
            <mx:FormItem label="enabled:">
                <s:CheckBox id="checkBox"
                        selected="true" />
            </mx:FormItem>
        </mx:Form>
    </s:controlBarContent>
 
    <fx:Style>
        @namespace s "library://ns.adobe.com/flex/spark";
        @namespace mx "library://ns.adobe.com/flex/mx";
 
        s|List {
            contentBackgroundColor: haloOrange;
        }
    </fx:Style>
 
    <s:List id="list"
            enabled="{checkBox.selected}"
            horizontalCenter="0" verticalCenter="0">
        <s:dataProvider>
            <s:ArrayList source="[One,Two,Three,Four,Five,Six]" />
        </s:dataProvider>
    </s:List>
 
</s:Application>

Or, you can also set the contentBackgroundColor style using ActionScript, as seen in the following example:

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2009/02/23/setting-the-content-background-color-on-the-fxlist-control-in-flex-gumbo/ -->
<s:Application name="Spark_List_contentBackgroundColor_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">
    <s:controlBarContent>
        <mx:Form>
            <mx:FormItem label="contentBackgroundColor:">
                <mx:ColorPicker id="colorPicker"
                        selectedColor="white"
                        change="colorPicker_changeHandler(event);"/>
            </mx:FormItem>
            <mx:FormItem label="enabled:">
                <s:CheckBox id="checkBox"
                        selected="true" />
            </mx:FormItem>
        </mx:Form>
    </s:controlBarContent>
 
    <fx:Script>
        <![CDATA[
            import mx.events.ColorPickerEvent;
 
            protected function colorPicker_changeHandler(evt:ColorPickerEvent):void {
                list.setStyle("contentBackgroundColor", evt.color);
            }
 
        ]]>
    </fx:Script>
 
    <s:List id="list"
            enabled="{checkBox.selected}"
            horizontalCenter="0" verticalCenter="0">
        <s:dataProvider>
            <s:ArrayList source="[One,Two,Three,Four,Five,Six]" />
        </s:dataProvider>
    </s:List>
 
</s:Application>

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.

One thought on “Setting the content background color on the Spark List control in Flex 4

  1. The style ‘contentBackgroundColor’ is only supported by type ‘spark.components.List’ with the theme(s) ‘spark’.

    I just want to set the background alpha to zero.

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