Changing the base theme color on the MX TextArea control in Flex 4

The following example shows how you can change the base/theme color on the MX TextArea control (with default Spark skin) in Flex 4 by setting the chromeColor style. Setting the chromeColor style sets both the TextArea control’s border color and horizontal/vertical scroll bar’s track/thumb colors.

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/2009/06/10/changing-the-base-theme-color-on-the-halo-textarea-control-in-flex-4/ -->
<s:Application name="MX_TextArea_SparkSkin_chromeColor_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="chromeColor:">
                <mx:ColorPicker id="colorPicker" selectedColor="red" />
            </mx:FormItem>
        </mx:Form>
    </s:controlBarContent>
 
    <mx:TextArea id="textArea"
            chromeColor="{colorPicker.selectedColor}"
            left="50" right="50"
            top="50" bottom="50">
        <mx:htmlText><fx:String source="lorem.html" /></mx:htmlText>
    </mx:TextArea>
 
</s:Application>

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View source is enabled in the following example.

You can also set the chromeColor 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/2009/06/10/changing-the-base-theme-color-on-the-halo-textarea-control-in-flex-4/ -->
<s:Application name="MX_TextArea_SparkSkin_chromeColor_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">
 
    <fx:Style>
        @namespace s "library://ns.adobe.com/flex/spark";
        @namespace mx "library://ns.adobe.com/flex/mx";
 
        mx|TextArea {
            chromeColor: haloOrange;
            left: 50;
            right: 50;
            top: 50;
            bottom: 50;
        }
    </fx:Style>
 
    <mx:TextArea id="textArea">
        <mx:htmlText><fx:String source="lorem.html" /></mx:htmlText>
    </mx:TextArea>
 
</s:Application>

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

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2009/06/10/changing-the-base-theme-color-on-the-halo-textarea-control-in-flex-4/ -->
<s:Application name="MX_TextArea_SparkSkin_chromeColor_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="chromeColor:">
                <mx:ColorPicker id="colorPicker"
                        selectedColor="red"
                        change="colorPicker_changeHandler(event)" />
            </mx:FormItem>
        </mx:Form>
    </s:controlBarContent>
 
    <fx:Script>
        <![CDATA[
            import mx.events.ColorPickerEvent;
 
            protected function colorPicker_changeHandler(evt:ColorPickerEvent):void {
                textArea.setStyle("chromeColor", evt.color);
            }
        ]]>
    </fx:Script>
 
    <mx:TextArea id="textArea"
            left="50" right="50"
            top="50" bottom="50">
        <mx:htmlText><fx:String source="lorem.html" /></mx:htmlText>
    </mx:TextArea>
 
</s: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/2009/06/10/changing-the-base-theme-color-on-the-halo-textarea-control-in-flex-4/ -->
<s:Application name="MX_TextArea_SparkSkin_chromeColor_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"
        initialize="init();">
 
    <fx:Script>
        <![CDATA[
            import mx.controls.TextArea;
 
            [Embed(source="lorem.html", mimeType="application/octet-stream")]
            private const lorem:Class;
 
            private var textArea:TextArea;
 
            private function init():void {
                textArea = new TextArea();
                textArea.htmlText = new lorem();
                textArea.left = 50;
                textArea.right = 50;
                textArea.top = 50;
                textArea.bottom = 50;
                textArea.setStyle("chromeColor", "haloOrange");
                addElement(textArea);
            }
        ]]>
    </fx:Script>
 
</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.

2 thoughts on “Changing the base theme color on the MX TextArea control in Flex 4

  1. Hello,

    Thank you for this explanation.
    But you forgot in your last code (in AS), to add this:

        <fx:Script>
            <![CDATA[
        		import mx.events.ColorPickerEvent;
    
                    private function colorPicker_change(event:ColorPickerEvent):void {
                    textArea.setStyle("baseColor", colorPicker.selectedColor);
                    }
            ]]>
        </fx:Script>
    
        <mx:ApplicationControlBar width="100%" cornerRadius="0">
            <mx:Form styleName="plain">
                <mx:FormItem label="baseColor:">
                    <mx:ColorPicker id="colorPicker"
                            selectedColor="red"
                            change="colorPicker_change(event);" />
                </mx:FormItem>
            </mx:Form>
        </mx:ApplicationControlBar>
    

    Anyway thanks again :)

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