Uniform theme and fonts for Qt apps in GTK environments

 

There are many ways to get uniform look and feel working, and this is only one of those that you can choose.

The easiest way to set a uniform appearance for QT applications under GTK environments is to use Kvantum and QT5CT.

Install both packages:

sudo pacman -S kvantum-qt5 qt5ct

Both applications are required because kvantum does not allow the font settings. Therefore qt5ct is also set as an environment variable, as it works in most desktop environments or when using a window manager as a user. In some cases, e.g. when using Cinnamon, it is necessary to set the variable system-wide, because Cinnamon seems to ignore variables that are set as users. Then we set qt5ct to use the kvantum theme and set fonts inside qt5ct.

Per-user variable will be configured like so:

Create the needed directory:

mkdir ~/.config/environment.d

and the needed config file with the needed variable:

echo "QT_QPA_PLATFORMTHEME=qt5ct" > ~/.config/environment.d/qt-theme.conf

To set this systemwide (if per user variable does not work):

su

echo "QT_QPA_PLATFORMTHEME=qt5ct" >> /etc/environment

exit

If you use per user settings log out and back in to make it work, for systemwide settings reboot the system.

Now use the Apps to set your Theme, Fonts, and Icons:

 

Using kvantummanager for the theme settings


 After this use qt5ct to use kvantum Style (dark for dark ones and only kvantum for light ones)


 Set the font for Windows and the fixed width, but do NOT create a font.conf!!!

 

Now choose an icon-theme

 

Changes will work without the need to log out or reboot, only apps already running need to be restarted to take the theme changes.

Notes:

Some applications may have their own theme settings like kdenlive:


 

Do you want to descend into the sources of endless information and possibilities? … Consult the Archwiki:

https://wiki.archlinux.org/title/Uniform_look_for_Qt_and_GTK_applications

source:  https://discovery.endeavouros.com/applications/uniform-theme-and-fonts-for-qt-apps-in-gtk-environments/2021/05/


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