Flex Examples
The following example shows how you can set the content background color on a Spark DropDownList control in Flex 4 by setting the contentBackgroundColor 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 http://www.adobe.com/products/flex/. To download the latest nightly build of the Flex 4 SDK, see http://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/2009/04/19/setting-a-content-background-color-on-a-spark-dropdownlist-control-in-flex-gumbo/ --> <s:Application name="Spark_DropDownList_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/halo"> <mx:ApplicationControlBar width="100%" cornerRadius="0"> <mx:Form styleName="plain"> <mx:FormItem label="contentBackgroundColor:"> <mx:ColorPicker id="colorPicker" selectedColor="white" /> </mx:FormItem> </mx:Form> </mx:ApplicationControlBar> <s:DropDownList id="dropDownList" prompt="Please select a thing..." labelField="label" contentBackgroundColor="{colorPicker.selectedColor}" horizontalCenter="0" top="60"> <s:dataProvider> <s:ArrayList> <fx:Object label="One" /> <fx:Object label="Two" /> <fx:Object label="Three" /> <fx:Object label="Four" /> <fx:Object label="Five" /> <fx:Object label="Six" /> <fx:Object label="Seven" /> <fx:Object label="Eight" /> <fx:Object label="Nine" /> </s:ArrayList> </s:dataProvider> </s:DropDownList> </s:Application>
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/2009/04/19/setting-a-content-background-color-on-a-spark-dropdownlist-control-in-flex-gumbo/ --> <s:Application name="Spark_DropDownList_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/halo"> <fx:Style> @namespace s "library://ns.adobe.com/flex/spark"; s|DropDownList { contentBackgroundColor: red; } </fx:Style> <s:DropDownList id="dropDownList" prompt="Please select a thing..." labelField="label" horizontalCenter="0" top="20"> <s:dataProvider> <s:ArrayList> <fx:Object label="One" /> <fx:Object label="Two" /> <fx:Object label="Three" /> <fx:Object label="Four" /> <fx:Object label="Five" /> <fx:Object label="Six" /> <fx:Object label="Seven" /> <fx:Object label="Eight" /> <fx:Object label="Nine" /> </s:ArrayList> </s:dataProvider> </s:DropDownList> </s:Application>
Or, you can set the contentBackgroundColor style using ActionScript, as seen in the following example:
<?xml version="1.0" encoding="utf-8"?> <!-- http://blog.flexexamples.com/2009/04/19/setting-a-content-background-color-on-a-spark-dropdownlist-control-in-flex-gumbo/ --> <s:Application name="Spark_DropDownList_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/halo"> <fx:Script> <![CDATA[ import mx.events.ColorPickerEvent; private function colorPicker_change(evt:ColorPickerEvent):void { dropDownList.setStyle("contentBackgroundColor", evt.color); dropDownList.openDropDown(); } ]]> </fx:Script> <mx:ColorPicker id="colorPicker" change="colorPicker_change(event);" left="10" top="10" /> <s:DropDownList id="dropDownList" prompt="Please select a thing..." labelField="label" horizontalCenter="0" top="20"> <s:dataProvider> <s:ArrayList> <fx:Object label="One" /> <fx:Object label="Two" /> <fx:Object label="Three" /> <fx:Object label="Four" /> <fx:Object label="Five" /> <fx:Object label="Six" /> <fx:Object label="Seven" /> <fx:Object label="Eight" /> <fx:Object label="Nine" /> </s:ArrayList> </s:dataProvider> </s:DropDownList> </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.
Peter deHaan
Peter deHaan currently works for Adobe on the Flex SDK QA team. While not working on Flex, Flash, and ColdFusion applications, Peter enjoys making up bios and writing in 3rd person. Peter's rarely updated blog can be found at blogs.adobe.com/pdehaan/, actionscriptexamples.com, airexamples.com, and coldfusionexamples.com.
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