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Re: Determine appearance settings

Manuel Hermann <email@hidden> wrote:

>Is there an easy way for a customized swing component to determine the user
>appearance settings of the System Preferences (Blue / Graphite)?
>
>The aqua look&feel reacts immediately when changing the settings in the
>preferences. I want my customized swing controls to behave the same way.

You could render a JComponent that has color in an offscreen BufferedImage,
then examine the resulting pixels for hue. You'll want to use something
like the knob of a JSlider that's easy to grab pixels from, and whose color
definitely tracks the system state.

I have not tried this using JComponents, but it does work with the
hilite-color (SystemColor.textHighlight).

I'd say the ickiest part of all this is that you don't receive any event to
tell you when the color changes. So you have to poll if you want to track
the change in something close to real-time. That may affect your
interpretation of "easy".

There may be another way, but you'd probably have to dig inside the Aqua
PLAF UI-delegates to figure out how things like JSlider learn about the
change and flip their appearance. If you found out, it would be
unsupported, and could well change with every version of Java that Apple
releases, past or future.

-- GG
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