I created this script at ~/.config/i3/scripts/qt6ct.sh to set QT_QPA_PLATFORMTHEME depending on whether I'm using Plasma or I3wm:
#!/bin/bash
CURRENT_DESKTOP=$(echo "$XDG_CURRENT_DESKTOP")
if [ "$CURRENT_DESKTOP" = "i3" ]; then
export QT_QPA_PLATFORMTHEME="qt5ct"
elif [ "$CURRENT_DESKTOP" = "KDE" ]; then
# Si estás usando Plasma (KDE), comentar la línea que exporta la variable
unset QT_QPA_PLATFORMTHEME
else
echo "Gestor de ventanas no es i3 ni kwin: $CURRENT_DESKTOP"
fi
echo $CURRENT_DESKTOP
echo $QT_QPA_PLATFORMTHEME
I created an autostart program and added this to my i3 config file
exec ~/.config/i3/scripts/qt6ct.sh
exec source ~/.config/i3/scripts/qt6ct.sh
I don't know what's wrong with it, but if I run it on a terminal, I get this (screenshot):
➤ ~/.config/i3/scripts/qt6ct.sh
i3
qt5ct
➤ echo "$QT_QPA_PLATFORMTHEME"
➤
So this script doesn't really export anything at all.
I have searched on every file that I thought could be exporting it as a null value (~/.bashrc, ~/.profile, ~/.bash_profile, ~/.xinitrc, ~/.Xresources, /etc/environment, /root/.profile, /root/.bashrc), but everything looks fine (no QT_QPA_PLATFORMTHEME anywhere, or is commented).
Solution
The only thing we'll need in.xprofile is sourcing the script:
#!/bin/bash
CURRENT_DESKTOP=$(echo "$XDG_CURRENT_DESKTOP")
if [[ "$CURRENT_DESKTOP" = "i3" ]]; then
export QT_QPA_PLATFORMTHEME="qt5ct"
export QT_SCREEN_SCALE_FACTORS=1.5 # 1.5
export QT_AUTO_SCREEN_SCALE_FACTOR=0
elif [[ "$CURRENT_DESKTOP" = "KDE" ]]; then
unset QT_QPA_PLATFORMTHEME
export QT_AUTO_SCREEN_SCALE_FACTOR=1
else
echo "Gestor de ventanas no es i3 ni kwin: $CURRENT_DESKTOP"
fi
echo $CURRENT_DESKTOP
echo $QT_QPA_PLATFORMTHEME
echo $QT_SCREEN_SCALE_FACTORS
echo $QT_AUTO_SCREEN_SCALE_FACTOR
BASH is so annoying. Try fixing your spaces. On my terminal I get this:
LOL you're right! Yet, I am still getting no better result when changing it:
Ok, here are very interesting things:
source ~/.config/i3/scripts/qt6ct.shat.profile, and logout. When I logged in, nothing has changed. I don't know why, since when I manually run it, it apparently changes the value ofQT_QPA_PLATFORMTHEME.qt5ctor runrofi --show -drunand then select the qt5ct app, then it works just fine. The same happens with dolphin: if I run it from rofi, then it looks awful, but if I run it from the terminal, it looks great. BUT if I close the terminal and open it again, everything goes back to normal (meaning: awful).After including
source ~/.config/i3/scripts/qt6ct.shto/etc/environmentand rebooting to see if anything changed: nope. No changes, the problem persists.OK, I have neither qt apps, nor other desktops, so I'm kind of shooting in the dark. I seem to remember reading that
.profileis sometimes not looked at and it's better to put in.bash_profileor even paste it into your.bashrcand see you still have the issue.Ok, something happened: adding it to
.bash_profiledid changeQT_QPA_PLATFORMTHEMEon i3 (whoohooo \o/), BUT it also did on plasma (ouch 😢), so the script for some reason is not returning what is supposed to.Paste what you've got so far and I'll look at it some more.
I think I figured it out, I created a
.xprofilefile and moved all the env stuff there:Now dolphin uses breeze themes, thunar uses its gtk version and also found out about how to fix the zoom issue (it was supposed to be another different battle but seems like they have more in common than what I thought!)
Thank you so much for helping me all the way here!! :)
Correction: I didn't entirely fix it!
There's a couple of stuff to be fixed: screenshot
Which means that in Plasma
QT_QPA_PLATFORMTHEMEis still read asqt5ct:(Correction 2: I FIXED IT!!
remove everything from .xprofile except sourcing the script:
Haha, that's great! That post was like a rollercoaster.