Some Qt apps now ignoring system style

ExecutorElassus

So, I have QT applications set (in ~/.config/Trolltech.conf, which is an unholy mess of a config file) to use the GTK+ style, which is this nice black-with-blue-highlights style that I've been using for years.

Lately, however, the following apps have stopped observing this style setting, and defaulting to some ugly-ass off-white with blue style that I never specified. The apps so far are:

calibre
transmission
vidalia
vlc

(evince uses a new GNOME-3.14 style that completely removes all the resize handles, making it even less usable than before, but that's a different issue).

Now: how is it that I specify the gtk+ style (in my case, using lxappearance, since there doesn't seem to be any native app to do it from inside FVWM, my WM for over a decade), and then some qt-based apps ignore this setting? How do I get them to pay attention to that setting, so I have a unified app look across all my gtk/qt applications?

Cheers,

EE

Naib · Posted: Mon Mar 09, 2015 1:15 pm Post subject:

Applications can choose to not listen to the global settings...

In the case of transmission:

ExecutorElassus · Posted: Mon Mar 09, 2015 2:05 pm Post subject:

thanks for the explanation. Actually, Calibre specifically has a checkbox for "use system default theme," but doesn't specify what this theme is. Since it's a Qt app, I'm assuming it would draw it from Qt5's config (which instructs it to use the GTK+ theme), but that's not happening.

This is what I guess I don't understand about the logic of some of these apps. What is the "system default" on a WM like FVWM, that doesn't use some theming engine to control themes? If ~/.config/Trolltech.conf says the style is "GTK+", which version does it mean? It certainly isn't the one set by lxappearance, since that's a dark theme that Calibre isn't using.

Cheers,

EE

Ant P. · Watchman Joined: 18 Apr 2009 Posts: 6920

ExecutorElassus · Posted: Mon Mar 09, 2015 6:54 pm Post subject:

Thanks for the clarification. This is the part that's frustrating. How, then, do I instruct Qt5 applications to use the same theme? I understand there's a QT_STYLE_OVERRIDE variable I can set, but that doesn't seem to help for calibre. There's some app for setting it on qt-apps.org, but that seems dodgy. Any tips?

Cheers,

EE