The following example shows how you can change the item background roll over color for a Flex ComboBox control by setting the rollOverColor style.
Full code after the jump.
<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/07/11/setting-the-item-background-roll-over-color-on-a-combobox-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="top"
backgroundColor="white">
<mx:Array id="arr">
<mx:Object label="One" />
<mx:Object label="Two" />
<mx:Object label="Three" />
<mx:Object label="Four" />
<mx:Object label="Five" />
<mx:Object label="Six" />
<mx:Object label="Seven" />
<mx:Object label="Eight" />
<mx:Object label="Nine" />
<mx:Object label="Ten" />
</mx:Array>
<mx:ApplicationControlBar dock="true">
<mx:Form styleName="plain">
<mx:FormItem label="rollOverColor:">
<mx:ColorPicker id="colorPicker"
selectedColor="#CCCCCC" />
</mx:FormItem>
</mx:Form>
</mx:ApplicationControlBar>
<mx:ComboBox id="comboBox"
dataProvider="{arr}"
rollOverColor="{colorPicker.selectedColor}" />
</mx:Application>
You can also set the rollOverColor style using an external .CSS file or <mx:Style /> block, as seen in the following example:
<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/07/11/setting-the-item-background-roll-over-color-on-a-combobox-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="top"
backgroundColor="white">
<mx:Style>
ComboBox {
rollOverColor: #CCCCCC;
}
</mx:Style>
<mx:Array id="arr">
<mx:Object label="One" />
<mx:Object label="Two" />
<mx:Object label="Three" />
<mx:Object label="Four" />
<mx:Object label="Five" />
<mx:Object label="Six" />
<mx:Object label="Seven" />
<mx:Object label="Eight" />
<mx:Object label="Nine" />
<mx:Object label="Ten" />
</mx:Array>
<mx:ComboBox id="comboBox"
dataProvider="{arr}" />
</mx:Application>
Or, you can set the rollOverColor style using ActionScript, as seen in the following example:
<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/07/11/setting-the-item-background-roll-over-color-on-a-combobox-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="top"
backgroundColor="white">
<mx:Script>
<![CDATA[
import mx.events.ColorPickerEvent;
private function colorPicker_change(evt:ColorPickerEvent):void {
comboBox.setStyle("rollOverColor", evt.color);
}
]]>
</mx:Script>
<mx:Array id="arr">
<mx:Object label="One" />
<mx:Object label="Two" />
<mx:Object label="Three" />
<mx:Object label="Four" />
<mx:Object label="Five" />
<mx:Object label="Six" />
<mx:Object label="Seven" />
<mx:Object label="Eight" />
<mx:Object label="Nine" />
<mx:Object label="Ten" />
</mx:Array>
<mx:ApplicationControlBar dock="true">
<mx:Form styleName="plain">
<mx:FormItem label="rollOverColor:">
<mx:ColorPicker id="colorPicker"
change="colorPicker_change(event);" />
</mx:FormItem>
</mx:Form>
</mx:ApplicationControlBar>
<mx:ComboBox id="comboBox"
dataProvider="{arr}" />
</mx:Application>
Due to popular demand, here is the “same” example in a more ActionScript friendly format:
<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/07/11/setting-the-item-background-roll-over-color-on-a-combobox-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="top"
backgroundColor="white"
initialize="init();">
<mx:Script>
<![CDATA[
import mx.containers.ApplicationControlBar;
import mx.containers.Form;
import mx.containers.FormItem;
import mx.controls.ColorPicker;
import mx.controls.ComboBox;
import mx.events.ColorPickerEvent;
private var arr:Array;
private var colorPicker:ColorPicker;
private var comboBox:ComboBox;
private function init():void {
arr = [];
arr.push({label:"One"});
arr.push({label:"Two"});
arr.push({label:"Three"});
arr.push({label:"Four"});
arr.push({label:"Five"});
arr.push({label:"Six"});
arr.push({label:"Seven"});
arr.push({label:"Eight"});
arr.push({label:"Nine"});
arr.push({label:"Ten"});
colorPicker = new ColorPicker();
colorPicker.addEventListener(ColorPickerEvent.CHANGE, colorPicker_change);
var formItem:FormItem = new FormItem();
formItem.label = "rollOverColor:";
formItem.addChild(colorPicker);
var form:Form = new Form();
form.styleName = "plain";
form.addChild(formItem);
var appControlBar:ApplicationControlBar;
appControlBar = new ApplicationControlBar();
appControlBar.dock = true;
appControlBar.addChild(form);
Application.application.addChildAt(appControlBar, 0);
comboBox = new ComboBox();
comboBox.dataProvider = arr;
addChild(comboBox);
}
private function colorPicker_change(evt:ColorPickerEvent):void {
comboBox.setStyle("rollOverColor", evt.color);
}
]]>
</mx:Script>
</mx:Application>
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