Toggling the border stroke on the Spark BorderContainer container in Flex 4

The following example shows how you can toggle the border stroke on a Spark BorderContainer container in Flex 4 by setting the Boolean borderVisible style.

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/2009/09/30/toggling-the-border-stroke-on-the-spark-border-container-in-flex-4/ -->
<s:Application name="Spark_Border_borderVisible_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>
        <s:CheckBox id="chckBx" label="borderVisible" selected="true" />
    </s:controlBarContent>
 
    <s:BorderContainer id="brdr"
            borderVisible="{chckBx.selected}"
            backgroundAlpha="0.1"
            backgroundColor="black"
            cornerRadius="25"
            width="90%" height="90%"
            horizontalCenter="0" verticalCenter="0">
    </s:BorderContainer>
 
</s:Application>

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You can also set the borderVisible 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/2009/09/30/toggling-the-border-stroke-on-the-spark-border-container-in-flex-4/ -->
<s:Application name="Spark_BorderContainer_borderVisible_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";
 
        s|BorderContainer {
            borderVisible: false;
            backgroundAlpha: 0.1;
            backgroundColor: black;
            cornerRadius: 25;
        }
    </fx:Style>
 
    <s:BorderContainer id="brdr"
            width="90%" height="90%"
            horizontalCenter="0" verticalCenter="0">
    </s:BorderContainer>
 
</s:Application>

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

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2009/09/30/toggling-the-border-stroke-on-the-spark-border-container-in-flex-4/ -->
<s:Application name="Spark_BorderContainer_borderVisible_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>
        <s:CheckBox id="chckBx"
                label="borderVisible"
                selected="true"
                change="chckBx_change(event);" />
    </s:controlBarContent>
 
    <fx:Script>
        <![CDATA[
            protected function chckBx_change(evt:Event):void {
                brdr.setStyle("borderVisible", chckBx.selected);
            }
        ]]>
    </fx:Script>
 
    <s:BorderContainer id="brdr"
            backgroundAlpha="0.1"
            backgroundColor="black"
            cornerRadius="25"
            width="90%" height="90%"
            horizontalCenter="0" verticalCenter="0">
    </s:BorderContainer>
 
</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.

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