Qt5 apps don't use the GTK style in non-GNOME desktops

[jorgicio]

I tried setting the XDG_CURRENT_DESKTOP, and XDG_SESSION_DESKTOP to GNOME, and the QT_STYLE_OVERRIDE to gtk, and it doesn't work. In fact, it uses the Windows one. Also, it doesn't use the GTK file dialog, but the QStyle one.

I'm using MATE, and QT 5.4.1.

If qtwidgets wasn't compiled with gtk style, hoy can I do?

[jorgicio]

Nevermind, I got what happened:

 

qtwidgets has gtkstyle disabled by default. A workaround, is unpacking, editing the configure script to force the gtkstyle enabled, compiling "manually", all with ebuild. Then, restart the session. Now it's working, but it still uses the QFileDialog, but GTK+-ish.

 

I hope this would be fixed in future releases, because editing that file every compiling time, is boring.

[spectromas]

I was curious about this as well when first using qt5 apps and never did find a solution for it. I hope your workaround is implemented somehow in the future, it seems like a lot of effort to go through for such a common need.

[jorgicio]

Yes, considering that a good solution, is adding the GTK style as a USE-flag, and/or patching the configure script to allow using the gtkstyle. Autodetecting the option value is not working very well, I think.

[jorgicio]

Well... qtgui and qtwidgets now support the gtkstyle useflag. Sync the tree, and then, reinstall it.

Recommended: set the gtkstyle useflag as global.