Bullseye not reporting dark theme
lazarus / 32-Linux

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dbannon · 2020-12-08 00:14

I have just noticed the current Debian Testing, bullseye, does not
appear to communicate its system colours to a Lazarus app. So, if a
user has selected a Dark Theme, the Lazarus app will not replicate
that dark theme. 

I know no other mainstream Linux distro that has this problem, does
anyone have any knowledge of this issue ?

Maybe someone could outline just how Lazarus gets this information, I
may be able to report it if I can say a bit more that "my apps don't
work with your distro".....

Davo

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dbannon · 2020-12-09 04:45

Just a follow up here, in case it interests someone.  I just surveyed
the bigger Linux distros to see where our apps do and do not inherit
system colors -

Ubuntu Mate 20.04 - Yes
Ubuntu Gnome 20.04 - Yes for GTK2; No for Qt5
Fedora 33 - Yes
Debian Bullseye (both mate and XFCe) - yes for GTK2; No for Qt5

Davo

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dbannon · 2020-12-23 02:28

And a further follow up, on Qt5 at least, its very easily solved. Set
an env variable, QT_QPA_PLATFORMTHEME=qt5ct and then install and run
qt5ct, you can set what ever colour scheme you like and all your Qt5
apps will follow nicely.

Davo

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Zoran · 2020-12-23 08:55

Quote from: dbannon on December 23, 2020, 03:28:26 amAnd a further
follow up, on Qt5 at least, its very easily solved. Set an env
variable, QT_QPA_PLATFORMTHEME=qt5ct and then install and run qt5ct,
you can set what ever colour scheme you like and all your Qt5 apps
will follow nicely.

Davo

Please report in bugtracker.

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avra · 2020-12-23 10:22

Quote from: dbannon on December 09, 2020, 05:45:19 amDebian Bullseye
(both mate and XFCe) - yes for GTK2; No for Qt5Is it QT5 or Lazarus
problem? Do all QT5 applications share the same problem and do not
follow the theme, or is it just Lazarus?

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Zoran · 2020-12-23 12:22

Quote from: avra on December 23, 2020, 11:22:53 amDo all QT5
applications share the same problem and do not follow the theme, or is
it just Lazarus?

Yes, that is the right question.

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dbannon · 2020-12-23 22:44

Quote from: avra on December 23, 2020, 11:22:53 amQuote from: dbannon
on December 09, 2020, 05:45:19 amDebian Bullseye (both mate and XFCe)
- yes for GTK2; No for Qt5Is it QT5 or Lazarus problem? Do all QT5
applications share the same problem and do not follow the theme, or is
it just Lazarus?

Or is it Bullseye ?  I think it might be Bullseye not including a Qt5
dark theme when installing all its libraries. But that is only a
guess.

I don't usually report bugs that one one else can say they have
experienced, (unless I also have a fix for it) thats why I posted here
first and, as it turned out, no one else has apparently seen it.  I
did try to follow the code back to what was not happening but it all
disappeared into the Qt libraries themselves. So, perhaps I need to
try another, non-lazarus Qt5 app on Bullseye ....

Davo