[Development] Supporting freedesktop icon themes in Qt5

[Pier Luigi]

2012/5/10 Jerome Leclanche <adys.wh at gmail.com>:
> Morning
>
> Qt currently does not properly support icon themes on Linux. This is a big
> issue here for Razor [1] as we're a non-KDE-based DE trying to use pure
> Qt. QIcon::fromTheme has some heuristics for KDE and Gnome, but other DEs
> are not supported. [2]
> We'd like to get this fixed for Qt5.0. My first attempt at getting it fixed
> was through a proposal for icon theme configuration, which was (rightly)
> rejected by the GTK team. After talking with them, they explained how they
> use xsettings for it [3] -- kde has a kde-xsettings plugin which implements
> xsettings on KDE too, so that could theoretically be used there too. However
> it also means Qt is going to need an xsettings backend.
>
> I linked a discussion post about it on #qt-labs yesterday, log below:
> <girishr_> Adys: sounds acceptable to me. we only don't allow api changes at
> this point
> <girishr_> Adys: any fixes to make desktop integration better are welcome
> <Adys> girishr_: it would be an internal change, but depending on how big
> xsettings support would have to be, it'd be a large changeset
> <girishr_> Adys: i don't think we had xsettings in qt, so i think the post
> is correct that Qt needs to have an implementation of that first
> <girishr_> Adys: it affects only xcb plugin, so shouldn't be a problem
> <girishr_> Adys: sroedal is the xcb maintainer afaik
>
> I'm not qualified to work on something like this, and the rest of the Razor
> team isn't too available currently, so this is mostly a FYI post. I was
> really hopeful to have this issue fixed for Qt 5.0, so if someone wants to
> or is planning to work on it I'd love to know.
>
> [1] http://razor-qt.org/
> [2] https://qt.gitorious.org/qt/qt/blobs/4.8/src/gui/kernel/qguiplatformplugin.cpp#line201
> [3] http://git.gnome.org/browse/gtk+/tree/gdk/x11/gdksettings.c

Icon themes works very well for me in my desktop environment, you
should write a platform theme plugin (QPlatformTheme) which reads
Razor settings.
If the DESKTOP_SESSION environment variable contains the name of your
plugin, it will be used.

-- 
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