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Detect Windows dark mode and apply GTK theme preference

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Co-authored-by: ashaduri <2302268+ashaduri@users.noreply.github.com>
This commit is contained in:
anthropic-code-agent[bot]
2026-03-06 15:02:12 +00:00
co-authored by ashaduri
parent aafae25aca
commit 6341f5a1a5
1 changed files with 26 additions and 0 deletions
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src/gui/gsc_init.cpp
+26
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@@ -505,6 +505,32 @@ bool app_init_and_loop(int& argc, char**& argv)
}
*/
// Detect Windows dark mode and set GTK theme preference accordingly
if constexpr(BuildEnv::is_kernel_family_windows()) {
Glib::RefPtr<Gtk::Settings> gtk_settings = Gtk::Settings::get_default();
if (gtk_settings) {
bool use_dark_theme = false;
#ifdef _WIN32
// Check Windows registry for dark mode preference
// HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize
// AppsUseLightTheme = 0 means dark mode, 1 means light mode
DWORD apps_use_light_theme = 1; // Default to light mode
if (hz::win32_get_registry_value_dword(HKEY_CURRENT_USER,
R"(Software\Microsoft\Windows\CurrentVersion\Themes\Personalize)",
"AppsUseLightTheme", apps_use_light_theme)) {
use_dark_theme = (apps_use_light_theme == 0);
debug_out_dump("app", "Windows theme detected: " << (use_dark_theme ? "dark" : "light") << "\n");
} else {
debug_out_dump("app", "Could not read Windows theme preference, defaulting to light mode.\n");
}
#endif
// Apply the dark theme preference to GTK
gtk_settings->property_gtk_application_prefer_dark_theme().set_value(use_dark_theme);
debug_out_dump("app", "GTK dark theme preference set to: " << use_dark_theme << "\n");
}
}
// The application is dpi-aware in Windows.
// However, Gtk3 does not support fractional scaling, so at 250% scaling in system settings, the UI will use 200%.
//