Tri-state dark reader mode switching: on/off/auto

[tecix]

It would be awesome if GoldenDict-ng could automatically switch between light and dark modes based on the system settings. Lots of us love using Dark Mode at night to save our eyes. If GoldenDict-ng could follow the system theme, it would make things super smooth and consistent with other apps.

[shenlebantongying]

Related colorSchemeChanged -> https://doc.qt.io/qt-6/qstylehints.html#colorScheme-prop

The "auto" option is only doable on Mac as of right now because

• On Windows, we also need to implement auto GUI dark theme switching. macOS has good dark them since ages ago, but the windows support is only introduced in Qt6.7 this year, and it is very buggy 💩. Need to wait for the next version.
• on Linux, there is technically no cross-Linux-platform colour theme switching. Qt's colorSchemeChanged only works in a few places. Providing "auto" is confusing.
  • Support for GNOME and KDE are hard-coded https://github.com/qt/qtbase/blob/v6.7.1/src/gui/platform/unix/qgenericunixthemes.cpp
  • Or the thing that nobody knows when it will work and who implemented it org.freedesktop.appearance portal https://github.com/qt/qtbase/blob/c195fe7d33decbd5ddd47ae46dbf8e0d9c20ba85/src/plugins/platformthemes/xdgdesktopportal/qxdgdesktopportaltheme.cpp#L66-L74

[tecix]

For the reference, I'm using Gnome Wayland and the UI automatically change to dark mode but not the reader.

[xiaoyifang]

as designed https://github.com/xiaoyifang/goldendict-ng/issues/271#issuecomment-1364671897 . the reader's dark mode is control seperatedly. Check Edit->Preference , check dark reader mode.