Flex Examples
Setting a Flex container’s background disabled color and disabled overlay alpha
The following example shows how to use the backgroundDisabledColor and disabledOverlayAlpha styles to add a nice overlay to a container when the container’s enabled property is set to false.
Full code after the jump.
<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2007/09/16/setting-a-flex-containers-background-disabled-color-and-disabled-overlay-alpha/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="middle"
backgroundColor="white"
creationComplete="init();">
<mx:Script>
<![CDATA[
private function init():void {
var col:uint = panel.getStyle("backgroundColor");
colorPicker.selectedColor = col;
}
]]>
</mx:Script>
<mx:ApplicationControlBar dock="true">
<mx:CheckBox id="checkBox"
label="enabled"
selected="true" />
<mx:Spacer width="50%" />
<mx:Label text="backgroundDisabledColor:" />
<mx:ColorPicker id="colorPicker" />
<mx:Spacer width="50%" />
<mx:Label text="disabledOverlayAlpha:" />
<mx:HSlider id="slider"
minimum="0"
maximum="1"
value="0.6"
liveDragging="true"
tickInterval="0.1"
showTrackHighlight="true" />
</mx:ApplicationControlBar>
<mx:Panel id="panel"
title="Panel title"
status="Panel status"
enabled="{checkBox.selected}"
backgroundColor="red"
backgroundDisabledColor="{colorPicker.selectedColor}"
disabledOverlayAlpha="{slider.value}">
<mx:Form>
<mx:FormHeading label="LOGIN" />
<mx:FormItem label="Username:">
<mx:TextInput id="userame" />
</mx:FormItem>
<mx:FormItem label="Password:">
<mx:TextInput id="password"
displayAsPassword="true" />
</mx:FormItem>
<mx:FormItem>
<mx:Button label="Login" />
</mx:FormItem>
</mx:Form>
</mx:Panel>
</mx:Application>
View source is enabled in the following example.
Peter deHaan
Peter deHaan currently works for Adobe on the Flex SDK QA team. While not working on Flex, Flash, and ColdFusion applications, Peter enjoys making up bios and writing in 3rd person. Peter's rarely updated blog can be found at blogs.adobe.com/pdehaan/, actionscriptexamples.com, airexamples.com, and coldfusionexamples.com.
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Worth mentioning that it is not possible to set the backgroundDisabledColor to black due to the following bug
https://bugs.adobe.com/jira/browse/SDK-12689
An much better overlay would have been one that only covers areas where there is visible children, instead of just creating a large square the shape of the container.
Do you know if its possible to set this as a style in the css for items that are typed as UIComponent?
So I have a situation where I would really like to create this exact visual effect in certain situations, but not have to disable the container in order to get the overlay. Any suggestions?