On Tuesday 22 November 2005 04:01, Bram Biesbrouck wrote:
> Hi all,
> 
> Can someone tell me what's the best approach to using transparency in an 
> application? I'm aware of the existence of transparency patterns, but they 
> are not really what I'm looking for.  Maybe someone can provide me a link to 
> some insight regarding this topic?

Transparency relative to other windows (from other processes)? That's Qt-4 only (setWindowOpacity).

Transparency relative to other widgets in the same process? Not really available,
 except if it's only about sharing a common background pixmap.  (iirc)

Transparency when painting a given widget or pixmap? Available with QPixmap and QPainter,
provided that you have the RENDER extension [or that you do it by hand with QImage].
The easy way is: create a PNG with transparency, load it, paint it.
For more info, see my chapter in the Practical Qt book :)

-- 
David Faure, faure@kde.org, sponsored by Trolltech to work on KDE,
Konqueror (http://www.konqueror.org), and KOffice (http://www.koffice.org).

 
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