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List: kde-devel
Subject: Re: KDE & transparency
From: David Faure <faure () kde ! org>
Date: 2005-11-30 8:51:12
Message-ID: 200511300951.12650.faure () kde ! org
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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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