Use Qt 6.5 styleHint colorScheme to detect dark theme

- keep linux compatibility

WE2-826

Signed-off-by: Raul Metsma <raul@metsma.ee>

Author: metsma

src/controller/application.cpp

@@ -33,6 +33,7 @@
 #include <QPalette>
 #include <QProcess>
 #include <QSettings>
+#include <QStyleHints>
 #include <QTranslator>
 
 inline CommandWithArguments::second_type parseArgumentJson(const QString& argumentStr)
@@ -74,19 +75,17 @@ Application::Application(int& argc, char** argv, const QString& name) :
 #endif
 }
 
-#ifndef Q_OS_MAC
 bool Application::isDarkTheme()
 {
-#ifdef Q_OS_WIN
-    QSettings settings(
-        "HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
-        QSettings::NativeFormat);
-    return settings.value("AppsUseLightTheme", 1).toInt() == 0;
+#if QT_VERSION >= QT_VERSION_CHECK(6, 5, 0)
+    return styleHints()->colorScheme() == Qt::ColorScheme::Dark;
 #else
-    // There is currently no straightforward way to detect dark mode in Linux, but this works for supported OS-s.
+    // There is currently no straightforward way to detect dark mode in Linux, but this works for
+    // supported OS-s.
     static const bool isDarkTheme = [] {
         QProcess p;
-        p.start(QStringLiteral("gsettings"), {"get", "org.gnome.desktop.interface", "color-scheme"});
+        p.start(QStringLiteral("gsettings"),
+                {"get", "org.gnome.desktop.interface", "color-scheme"});
         if (p.waitForFinished()) {
             return p.readAllStandardOutput().contains("dark");
         }
@@ -97,7 +96,6 @@ bool Application::isDarkTheme()
     return isDarkTheme;
 #endif
 }
-#endif
 
 void Application::loadTranslations(const QString& lang)
 {

src/controller/application.mm

@@ -27,13 +27,6 @@
 #import <AppKit/AppKit.h>
 #import <Cocoa/Cocoa.h>
 
-bool Application::isDarkTheme()
-{
-    auto appearance = [NSApp.effectiveAppearance bestMatchFromAppearancesWithNames:
-        @[ NSAppearanceNameAqua, NSAppearanceNameDarkAqua ]];
-    return [appearance isEqualToString:NSAppearanceNameDarkAqua];
-}
-
 void Application::showAbout()
 {
     NSLog(@"web-eid-app: starting app");