FEAT(client): Automatically sync theme with OS color scheme- v5

This update introduces an automatic theme switch that changes based on the OS color scheme at startup and during runtime. This feature is implemented for Qt 6.2 and includes compatibility for Qt 6.5 once Mumble upgrades.

Implements mumble-voip#6515

src/mumble/Themes.cpp

@@ -13,8 +13,8 @@
 #include <QPalette>
 #include <QSettings>
 #include <QStyleHints>
-#include <QTextStream>
 
+QString Themes::currentThemePath;
 
 boost::optional< ThemeInfo::StyleInfo > Themes::getConfiguredStyle(const Settings &settings) {
 	if (settings.themeName.isEmpty() && settings.themeStyleName.isEmpty()) {
@@ -63,37 +63,23 @@ void Themes::applyFallback() {
 }
 
 bool Themes::applyConfigured() {
-	static QString currentThemePath;
-
+
 
 	boost::optional< ThemeInfo::StyleInfo > style = Themes::getConfiguredStyle(Global::get().s);
 	if (!style) {
 		return false;
 	}
 
-	QString themePath;
+	QString themePath = style->getPlatformQss().absoluteFilePath();
 	if (style->themeName == "Auto" || style->name == "Auto") {
-#if QT_VERSION >= QT_VERSION_CHECK(6, 5, 0)
-		auto colorScheme = QGuiApplication::styleHints()->colorScheme();
-		if (colorScheme == Qt::ColorScheme::Dark) {
-			themePath = ":/themes/Default/Dark.qss";
-		} else {
-			themePath = ":/themes/Default/Lite.qss";
-		}
-#else
+
 		bool isDarkTheme = detectSystemTheme();
 		if (isDarkTheme) {
 			themePath = ":/themes/Default/Dark.qss";
 		} else {
 			themePath = ":/themes/Default/Lite.qss";
 		}
-#endif
-	} else {
-		if (style->name == "Dark") {
-			themePath = ":/themes/Default/Dark.qss";
-		} else {
-			themePath = ":/themes/Default/Lite.qss";
-		}
+
 	}
 
 	// Early exit if the theme path is the same as the current one
@@ -149,9 +135,8 @@ bool Themes::apply() {
 
 bool Themes::detectSystemTheme() {
 #if QT_VERSION >= QT_VERSION_CHECK(6, 5, 0)
-	return false; // This should not be called for Qt 6.5 and above
+	return QGuiApplication::styleHints()->colorScheme() == Qt::ColorScheme::Dark;
 #else
-// Custom method to detect dark theme for Qt 6.2 and below
 #	ifdef Q_OS_WIN
 	QSettings settings("HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize",
 					   QSettings::NativeFormat);

src/mumble/Themes.h

@@ -66,6 +66,9 @@ class Themes {
 	/// If a the file is is available, the function returns true.
 	/// If no file is available, it returns false.
 	static bool readStylesheet(const QString &stylesheetFn, QString &stylesheetContent);
+
+	/// Member variable to store the current theme path
+	static QString currentThemePath;
 };
 
 #endif // MUMBLE_MUMBLE_THEMES_H_