Applying an effect when an HBox container is resized in Flex

The following example shows how you can apply a resize effect to a Flex HBox container by setting the resizeEffect style/effect.

Full code after the jump.

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/10/01/applying-an-effect-when-an-hbox-container-is-resized-in-flex/ -->
<mx:Application name="HBox_resizeEffect_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:HDividedBox id="hDividedBox"
            width="100%"
            height="100%">
        <mx:HBox id="hBox1"
                backgroundColor="haloGreen"
                resizeEffect="Resize"
                width="100%"
                height="100%" />
        <mx:HBox id="hBox2"
                backgroundColor="haloBlue"
                resizeEffect="Resize"
                width="100%"
                height="100%" />
    </mx:HDividedBox>

</mx:Application>

View source is enabled in the following example.

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

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/10/01/applying-an-effect-when-an-hbox-container-is-resized-in-flex/ -->
<mx:Application name="HBox_resizeEffect_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Style>
        HBox {
            resizeEffect: ClassReference("mx.effects.Resize");
        }
    </mx:Style>

    <mx:HDividedBox id="hDividedBox"
            width="100%"
            height="100%">
        <mx:HBox id="hBox1"
                backgroundColor="haloGreen"
                width="100%"
                height="100%" />
        <mx:HBox id="hBox2"
                backgroundColor="haloBlue"
                width="100%"
                height="100%" />
    </mx:HDividedBox>

</mx:Application>

Or, you can set the resizeEffect style/effect using ActionScript, as seen in the following example:

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/10/01/applying-an-effect-when-an-hbox-container-is-resized-in-flex/ -->
<mx:Application name="HBox_resizeEffect_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white"
        initialize="init();">

    <mx:Script>
        <![CDATA[
            import mx.effects.Resize;

            private function init():void {
                hBox1.setStyle("resizeEffect", Resize);
                hBox2.setStyle("resizeEffect", Resize);
            }
        ]]>
    </mx:Script>

    <mx:HDividedBox id="hDividedBox"
            width="100%"
            height="100%">
        <mx:HBox id="hBox1"
                backgroundColor="haloGreen"
                width="100%"
                height="100%" />
        <mx:HBox id="hBox2"
                backgroundColor="haloBlue"
                width="100%"
                height="100%" />
    </mx:HDividedBox>

</mx:Application>

Due to popular demand, here is the “same” example in a more ActionScript friendly format:

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/10/01/applying-an-effect-when-an-hbox-container-is-resized-in-flex/ -->
<mx:Application name="HBox_resizeEffect_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white"
        initialize="init();">

    <mx:Script>
        <![CDATA[
            import mx.containers.HBox;
            import mx.containers.HDividedBox;
            import mx.effects.Resize;

            private var hBox1:HBox;
            private var hBox2:HBox;
            private var hDividedBox:HDividedBox;

            private function init():void {
                hBox1 = new HBox();
                hBox1.percentWidth = 100;
                hBox1.percentHeight = 100;
                hBox1.setStyle("backgroundColor", "haloGreen");
                hBox1.setStyle("resizeEffect", Resize);

                hBox2 = new HBox();
                hBox2.percentWidth = 100;
                hBox2.percentHeight = 100;
                hBox2.setStyle("backgroundColor", "haloBlue");
                hBox2.setStyle("resizeEffect", Resize);

                hDividedBox = new HDividedBox();
                hDividedBox.percentWidth = 100;
                hDividedBox.percentHeight = 100;
                hDividedBox.addChild(hBox1);
                hDividedBox.addChild(hBox2);
                addChild(hDividedBox);
            }
        ]]>
    </mx:Script>

</mx:Application>