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Using the dark theme with Cosmic with flatpaks? (feddit.nl)

submitted 2 months ago by [email protected] to c/[email protected]

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I want to use the dark cosmic theme with kweather from flatpak. I've tried lots of stuff, but I don't understand how to determine what is a valid theme from terminal, or how to add to use it with a flatpak.

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[–] [email protected] 1 points 2 months ago* (last edited 2 months ago) (1 children)

After seeing this post I managed to get mixed themes with Kvantum between Qt5 and Qt6 with flatpaks. Though, kweather uses Qt6.

edit: I did also confirm it is possible to theme Qt6 applications with Kvantum on Cosmic.

There's a discussion here about adding support to Ubuntu, but I just used the install instructions for Ubuntu directly from the Kvantum repository.

[–] [email protected] 1 points 2 months ago* (last edited 2 months ago) (1 children)

I finally managed to theme the org.kde.kweather flatpak, but I didn't use qt6ct.

I just ended up doing

sudo apt install plasma-desktop

Then opening KDE Settings, changing the theme to Breeze Dark and then

sudo apt remove plasma-desktop
sudo apt autoremove

I think these steps should also work for other applications that were originally made for KDE, but I'm new to using Desktop Linux as a primary DE. I don't really know if there are any consequences for doing this, but it seemed to work...

I think org.kde.kweather uses abnormal theming intended for KDE. I did a bunch of testing, I went back to older versions of it from months ago. I finally found a version that was compatible with Kvantum, and installed a package that makes Kvantum work with qt6ct.

The kvantum theme was mostly broken with org.kde.kweather in the older verison. And, then I found out that KDE applications read from ~/.config/kdeglobals, so I found a sample version and confirmed that I could in fact change the theme by creating the file. After this, I realized just using KDE to change the theme was probably going to be the easiest way forward, and that's how I ended up at the above solution.

[–] [email protected] 1 points 2 months ago* (last edited 2 months ago)

I forgot to say, it's also possible to use Kvantum with KDE applications that are flatpaks.

I just had to set the theme to Kvantum in the KDE Settings. I also noticed that the theme works slightly better if the platform theme on KDE applications is exported as QT_QPA_PLATFORMTHEME=kde, though it's not necessary. One other note, QT works by using plugins. I think the export is specifying the installed plugin. That was confusing to me, I was searching for config files but it's a plugin to QT.

edit: When opening the KDE settings, I think I also had to change the export to QT_QPA_PLATFORM=kde temporarily so that KDE recognized that it was supposed to change configuration files on the filesystem. Otherwise, I think it expects that qt6ct is managing it, and it shouldn't do anything. (because qt6ct was likely set earlier in in either the /etc/environment or in the ~/.profile)

I don't remember it was a requirement or not. Just that I had to change it so that KDE Settings would use the theme when I opened it.