How do I change the application background color at run-time in a Flex 3.5 application?
- by Adam Tuttle
I have a Flex 3.5 application that will serve multiple purposes, and as part of the visual changes that I'd like to make to indicate which mode the application is in, I want to change its background color.
Currently, the application tag looks like this:
<mx:Application
xmlns:mx="http://www.adobe.com/2006/mxml"
xmlns:com="ventures.view.component.*"
xmlns:views="ventures.view.*"
layout="absolute"
preinitialize="onPreInitialize()"
creationComplete="onCreationComplete()"
applicationComplete="onApplicationComplete()"
click="onClick(event)"
enabled="{(!chainController.generalLocked)}"
backgroundGradientColors="[0xFFFFFF, 0xFFFFFF]"
>
I've tried using a binding, for both the backgroundColor and backgroundGradientColors attributes:
<mx:Application
xmlns:mx="http://www.adobe.com/2006/mxml"
...
backgroundColor="{app_background_color}"
>
—and—
<mx:Application
xmlns:mx="http://www.adobe.com/2006/mxml"
...
backgroundGradientColors="{app_background_color}"
>
but for the former binding is not allowed, and for the latter there is a warning that:
Data binding will not be able to detect assignments to "app_background_color".
I also ran across this page which seems to indicate that I could do it with the setStyle() method, but the documentation seems to indicate that this method is only available for components, not the main canvas.
I suppose I could wrap everything in a <mx:Canvas></mx:Canvas> specificially for this purpose, but that seems wasteful—like Div-itis in HTML or something.
What's the best way to change the main application background color at run-time?
