Adding a hover glow filter to an MX Image control in Flex 4

The following example shows how you can apply a hover glow filter to an MX Image control in Flex 4 by using the rollOver and rollOut events to set the filters property on the Image control to an array with a GlowFilter instance.

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/2010/06/25/adding-a-hover-glow-filter-to-an-mx-image-control-in-flex-4/ -->
<s:Application name="MX_Image_filters_GlowFilter_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"
        xmlns:comps="comps.*">
    <s:layout>
        <s:HorizontalLayout horizontalAlign="center" verticalAlign="middle" />
    </s:layout>
 
    <fx:Script>
        <![CDATA[
            import flash.filters.GlowFilter;
 
            protected function img_rollOverHandler(evt:MouseEvent):void {
                Image(evt.currentTarget).filters = [new GlowFilter(0xFF0000)];
            }
 
            protected function img1_rollOutHandler(evt:MouseEvent):void {
                Image(evt.currentTarget).filters = [];
            }
        ]]>
    </fx:Script>
 
    <mx:Image id="img1"
            source="http://helpexamples.com/flash/images/image1.jpg"
            rollOver="img_rollOverHandler(event);"
            rollOut="img1_rollOutHandler(event);" />
 
</s:Application>

View source is enabled in the following example.

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Or, instead of specifying the rollOver and rollOut event handlers for each Image component instance, you could create a custom component that extends the MX Image control and adds the rollOver/rollOut logic, as seen in the following example:

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2010/06/25/adding-a-hover-glow-filter-to-an-mx-image-control-in-flex-4/ -->
<s:Application name="MX_Image_filters_GlowFilter_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"
        xmlns:comps="comps.*">
    <s:layout>
        <s:HorizontalLayout horizontalAlign="center" verticalAlign="middle" />
    </s:layout>
 
    <comps:GlowImage id="img2"
            source="http://helpexamples.com/flash/images/image2.jpg"
            scaleX="0.5" scaleY="0.5" />
 
    <comps:GlowImage id="img3"
            source="http://helpexamples.com/flash/images/image3.jpg"
            scaleX="0.5" scaleY="0.5" />
 
</s:Application>

And the custom MX Image control, comps/GlowImage.mxml, is as follows:

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2010/06/25/adding-a-hover-glow-filter-to-an-mx-image-control-in-flex-4/ -->
<mx:Image name="GlowImage"
        xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/mx"
        rollOver="rollOverHandler(event);"
        rollOut="rollOutHandler(event);">
 
    <fx:Script>
        <![CDATA[
            import flash.filters.GlowFilter;
 
            protected function rollOverHandler(evt:MouseEvent):void {
                filters = [new GlowFilter(0xFF0000)];
            }
 
            protected function rollOutHandler(evt:MouseEvent):void {
                filters = [];
            }
        ]]>
    </fx:Script>
 
</mx:Image>

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.

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