Re: Problem with Dark Theme and Foreground

[Dimitris Anogiatis <dosida@xxxxxxxxx>]

QT5 has its own Configuration tool where you can select a dark theme if you
want...  it's called qt5ct
QT6 also has the same kind of tool called qt6ct

The IDE might be able to select the theme but the compiled apps are
probably getting their theme options from the system not from the IDE.

On Sat, Nov 22, 2025 at 5:32 PM CD <dessere.claude@xxxxxx> wrote:

> I don't know which bug you're referring to,
> nor how that line ended up in the project file.
>
>  I've tested it with and without that line,
> and I get exactly the same behavior
> except that `Application.Env["GB_GUI"]`
> returns nothing with gb.qt5.
>
>  I've made a summary, which I've attached.
>
>  One thing has changed with the gb.qt5 component:
> In my first email about this, the color wasn't displaying in design mode;
> now it is.
>  But in runtime mode, there's still no foreground color for the button!
>
> Regards
>
> [System]
> Gambas=3.21.1 5994807 (master)
> OperatingSystem=Linux
> Distribution=Ubuntu 24.04.3 LTS (Noble Numbat)
> Kernel=6.8.0-88-generic
> Architecture=x86_64
> Cores=8
> Memory=7817M
> Language=fr_FR.UTF-8
> Platform=x11
> Desktop=MATE
> DesktopResolution=96
> DesktopScale=9
> WidgetTheme=blackmate
> Font=Ubuntu Mono,13
> DarkTheme=True
> [Programs]
> dpkg=Programme « dpkg » de gestion de paquets Debian version 1.22.6
> (amd64).
> gcc=gcc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
> git=git version 2.43.0
> msgmerge=msgmerge (GNU gettext-tools) 0.21
> rpmbuild=RPM version 4.18.2
> [Libraries]
> Cairo=libcairo.so.2.11800.0
> Curl=libcurl.so.4.8.0
> DBus=libdbus-1.so.3.32.4
> GDK2=libgdk-x11-2.0.so.0.2400.33
> GDK3=libgdk-3.so.0.2409.32
> GStreamer=libgstreamer-1.0.so.0.2402.0
> GTK+2=libgtk-x11-2.0.so.0.2400.33
> GTK+3=libgtk-3.so.0.2409.32
> OpenGL=libGL.so.1.7.0
> Poppler=libpoppler.so.134.0.0
> Poppler=libpoppler.so.73.0.0
> QT5=libQt5Core.so.5.15.13
> QT6=libQt6Core.so.6.4.2
> RSvg=librsvg-2.so.2.50.0
> SDL=libSDL2-2.0.so.0.3000.0
> SQLite3=libsqlite3.so.0.8.6
> [Environment]
> COMPIZ_CONFIG_PROFILE=mate
> DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
> DEBUGINFOD_URLS=https://debuginfod.ubuntu.com
> DEFAULTS_PATH=/usr/share/gconf/mate.default.path
> DESKTOP_SESSION=mate
> DISPLAY=:0
> GB_GUI=gb.gtk3
> GDMSESSION=mate
> GDM_LANG=fr_FR
> GIO_LAUNCHED_DESKTOP_FILE=<home>/Bureau/gambas3.desktop
> GIO_LAUNCHED_DESKTOP_FILE_PID=56895
> GPG_AGENT_INFO=/run/user/1000/gnupg/S.gpg-agent:0:1
> GTK3_MODULES=xapp-gtk3-module
> GTK_MODULES=appmenu-gtk-module:gail:atk-bridge:canberra-gtk-module
> GTK_OVERLAY_SCROLLING=0
> HOME=<home>
> INSIDE_CAJA_PYTHON=
> LANG=fr_FR.UTF-8
> LANGUAGE=fr_FR.UTF-8
> LC_ADDRESS=fr_FR.UTF-8
> LC_IDENTIFICATION=fr_FR.UTF-8
> LC_MEASUREMENT=fr_FR.UTF-8
> LC_MONETARY=fr_FR.UTF-8
> LC_NAME=fr_FR.UTF-8
> LC_NUMERIC=fr_FR.UTF-8
> LC_PAPER=fr_FR.UTF-8
> LC_TELEPHONE=fr_FR.UTF-8
> LC_TIME=fr_FR.UTF-8
> LOGNAME=<user>
> MANDATORY_PATH=/usr/share/gconf/mate.mandatory.path
> MATE_DESKTOP_SESSION_ID=this-is-deprecated
> PAPERSIZE=a4
>
> PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
> PWD=<home>
> QT_ACCESSIBILITY=1
> QT_FONT_DPI=96
> QT_LOGGING_RULES=*.debug=false
> QT_QPA_PLATFORMTHEME=gtk2
> QT_SCALE_FACTOR=1
>
> SESSION_MANAGER=local/<hostname>:@/tmp/.ICE-unix/2337,unix/<hostname>:/tmp/.ICE-unix/2337
> SHELL=/bin/bash
> SHLVL=0
> SSH_AUTH_SOCK=/run/user/1000/keyring/ssh
> TZ=:/etc/localtime
> UBUNTU_MENUPROXY=1
> USER=<user>
> XAUTHORITY=<home>/.Xauthority
> XDG_CONFIG_DIRS=/etc/xdg/xdg-mate:/etc/xdg
> XDG_CURRENT_DESKTOP=MATE
>
> XDG_DATA_DIRS=/usr/share/mate:/usr/share/mate:/usr/share/gnome:/usr/local/share:/usr/share:/var/lib/snapd/desktop
> XDG_GREETER_DATA_DIR=/var/lib/lightdm-data/<user>
> XDG_RUNTIME_DIR=/run/user/1000
> XDG_SEAT=seat0
> XDG_SEAT_PATH=/org/freedesktop/DisplayManager/Seat0
> XDG_SESSION_CLASS=user
> XDG_SESSION_DESKTOP=mate
> XDG_SESSION_ID=c2
> XDG_SESSION_PATH=/org/freedesktop/DisplayManager/Session0
> XDG_SESSION_TYPE=x11
> XDG_VTNR=7
>
> Le samedi 22 novembre 2025 à 17:00 +0000, Bruce Steers a écrit :
>
> That was odd.
> I could only get your program to run with gb.gtk3.
>
> It did not matter how i set the GB_GUI env it always used gb.gtk3
>
> I then removed this line from the ".project" file...
> StartupEnvironment=GB_GUI=gb.qt5 gambas3
>
> After removing that line it now uses the different gui toolkits requested
> in the IDE.
>
> I do not know if that helps with your issue?  it certainly seemed to fix a
> bug.
>
> Respects
> BruceS
>
>
> On Sat, 22 Nov 2025 at 16:25, CD <dessere.claude@xxxxxx> wrote:
>
> Hello, thank you for your reply.
>
> I'm really disappointed!
>
> I've tried all the themes offered by Mate, but nothing works.
>
> I wrote an app that displays information for the three components:
> gb.gui  selects gb.gtk3
> gb.gui.qt  selects gb.qt6
> gb.qt5  selects gb.qt5 gambas3
>
> In design mode, the button doesn't display correctly in all three cases!
>
> The attached app includes a screenshot for each of the three cases.
>
> Only with gb.gui does the color display correctly when running.
>
> I've also attached a screenshot of Gambas3 in design mode with the test
> app.
>
> I've also included two files in the attached project that describe the
> theme I'm using.
>
> Like many others, I find that Ubuntu isn't what it used to be.
>
> What configuration do you recommend:
>
> Distribution
> Desktop
> Dark theme
> Environment settings, etc.?
>
> Thank you in advance for your expert advice.
> Regards
>
> [System]
> Gambas=3.21.1 5994807 (master)
> OperatingSystem=Linux
> Distribution=Ubuntu 24.04.3 LTS (Noble Numbat)
> Kernel=6.8.0-88-generic
> Architecture=x86_64
> Cores=8
> Memory=7817M
> Language=fr_FR.UTF-8
> Platform=x11
> Desktop=MATE
> DesktopResolution=96
> DesktopScale=9
> WidgetTheme=proxy
> Font=Ubuntu,11
> DarkTheme=True
> [Programs]
> dpkg=Programme « dpkg » de gestion de paquets Debian version 1.22.6
> (amd64).
> gcc=gcc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0
> git=git version 2.43.0
> msgmerge=msgmerge (GNU gettext-tools) 0.21
> rpmbuild=RPM version 4.18.2
> [Libraries]
> Cairo=libcairo.so.2.11800.0
> Curl=libcurl.so.4.8.0
> DBus=libdbus-1.so.3.32.4
> GDK2=libgdk-x11-2.0.so.0.2400.33
> GDK3=libgdk-3.so.0.2409.32
> GStreamer=libgstreamer-1.0.so.0.2402.0
> GTK+2=libgtk-x11-2.0.so.0.2400.33
> GTK+3=libgtk-3.so.0.2409.32
> OpenGL=libGL.so.1.7.0
> Poppler=libpoppler.so.134.0.0
> Poppler=libpoppler.so.73.0.0
> QT5=libQt5Core.so.5.15.13
> QT6=libQt6Core.so.6.4.2
> RSvg=librsvg-2.so.2.50.0
> SDL=libSDL2-2.0.so.0.3000.0
> SQLite3=libsqlite3.so.0.8.6
> [Environment]
> COMPIZ_CONFIG_PROFILE=mate
> DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
> DEBUGINFOD_URLS=https://debuginfod.ubuntu.com
> DEFAULTS_PATH=/usr/share/gconf/mate.default.path
> DESKTOP_SESSION=mate
> DISPLAY=:0
> GB_GUI=gb.qt5
> GDMSESSION=mate
> GDM_LANG=fr_FR
> GIO_LAUNCHED_DESKTOP_FILE=<home>/Bureau/gambas3.desktop
> GIO_LAUNCHED_DESKTOP_FILE_PID=8877
> GPG_AGENT_INFO=/run/user/1000/gnupg/S.gpg-agent:0:1
> GTK3_MODULES=xapp-gtk3-module
> GTK_MODULES=appmenu-gtk-module:gail:atk-bridge:canberra-gtk-module
> GTK_OVERLAY_SCROLLING=0
> HOME=<home>
> INSIDE_CAJA_PYTHON=
> LANG=fr_FR.UTF-8
> LANGUAGE=fr_FR.UTF-8
> LC_ADDRESS=fr_FR.UTF-8
> LC_IDENTIFICATION=fr_FR.UTF-8
> LC_MEASUREMENT=fr_FR.UTF-8
> LC_MONETARY=fr_FR.UTF-8
> LC_NAME=fr_FR.UTF-8
> LC_NUMERIC=fr_FR.UTF-8
> LC_PAPER=fr_FR.UTF-8
> LC_TELEPHONE=fr_FR.UTF-8
> LC_TIME=fr_FR.UTF-8
> LOGNAME=<user>
> MANDATORY_PATH=/usr/share/gconf/mate.mandatory.path
> MATE_DESKTOP_SESSION_ID=this-is-deprecated
> PAPERSIZE=a4
>
> PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
> PWD=<home>
> QT_ACCESSIBILITY=1
> QT_FONT_DPI=96
> QT_LOGGING_RULES=*.debug=false
> QT_QPA_PLATFORMTHEME=gtk2
> QT_SCALE_FACTOR=1
>
> SESSION_MANAGER=local/<hostname>:@/tmp/.ICE-unix/2337,unix/<hostname>:/tmp/.ICE-unix/2337
> SHELL=/bin/bash
> SHLVL=0
> SSH_AUTH_SOCK=/run/user/1000/keyring/ssh
> TZ=:/etc/localtime
> UBUNTU_MENUPROXY=1
> USER=<user>
> XAUTHORITY=<home>/.Xauthority
> XDG_CONFIG_DIRS=/etc/xdg/xdg-mate:/etc/xdg
> XDG_CURRENT_DESKTOP=MATE
>
> XDG_DATA_DIRS=/usr/share/mate:/usr/share/mate:/usr/share/gnome:/usr/local/share:/usr/share:/var/lib/snapd/desktop
> XDG_GREETER_DATA_DIR=/var/lib/lightdm-data/<user>
> XDG_RUNTIME_DIR=/run/user/1000
> XDG_SEAT=seat0
> XDG_SEAT_PATH=/org/freedesktop/DisplayManager/Seat0
> XDG_SESSION_CLASS=user
> XDG_SESSION_DESKTOP=mate
> XDG_SESSION_ID=c2
> XDG_SESSION_PATH=/org/freedesktop/DisplayManager/Session0
> XDG_SESSION_TYPE=x11
> XDG_VTNR=7
>
>
>
>
>