Utility method to check if a theme is supposed to be in dark or light mode.

Took 22 minutes

Took 4 seconds

cockatrice/src/interface/theme_manager.cpp

@@ -108,6 +108,31 @@ void ThemeManager::ensureThemeDirectoryExists()
     }
 }
 
+bool ThemeManager::isDarkMode()
+{
+    auto themeName = SettingsCache::instance().getThemeName();
+    // Explicit Dark Mode
+    if (themeName == FUSION_THEME_NAME_LIGHT || themeName.endsWith("(Light)")) {
+        return false;
+    }
+    // Explicit Light Mode
+    if (themeName == FUSION_THEME_NAME_DARK || themeName.endsWith("(Dark)")) {
+        return true;
+    }
+
+    // Auto detection on compatible Qt versions
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 5, 0))
+    if (QGuiApplication::styleHints()->colorScheme() == Qt::ColorScheme::Dark &&
+        (themeName == NONE_THEME_NAME || themeName == FUSION_THEME_NAME || themeName.endsWith("(System Default)"))) {
+        return true;
+    } else {
+        return false;
+    }
+#endif
+    // Default to light mode
+    return false;
+}
+
 QStringMap &ThemeManager::getAvailableThemes()
 {
     QDir dir;

cockatrice/src/interface/theme_manager.h

@@ -50,6 +50,7 @@ private:
 
 protected:
     void ensureThemeDirectoryExists();
+    bool isDarkMode();
     QBrush loadBrush(QString fileName, QColor fallbackColor);
     QBrush loadExtraBrush(QString fileName, QBrush &fallbackBrush);