1 files changed, 134 insertions, 0 deletions
diff --git a/meshmc/launcher/ui/themes/SystemTheme.cpp b/meshmc/launcher/ui/themes/SystemTheme.cpp
new file mode 100644
index 0000000000..42022c7e7e
--- /dev/null
+++ b/meshmc/launcher/ui/themes/SystemTheme.cpp
@@ -0,0 +1,134 @@
+/* SPDX-FileCopyrightText: 2026 Project Tick
+ * SPDX-FileContributor: Project Tick
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ *   MeshMC - A Custom Launcher for Minecraft
+ *   Copyright (C) 2026 Project Tick
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "SystemTheme.h"
+#include <QApplication>
+#include <QStyle>
+#include <QStyleFactory>
+#include <QDebug>
+
+static const QStringList S_NATIVE_STYLES{"windows11", "windowsvista", "macos",
+										 "system", "windows"};
+
+SystemTheme::SystemTheme(const QString& styleName,
+						 const QPalette& defaultPalette, bool isDefaultTheme)
+{
+	m_themeName = isDefaultTheme ? "system" : styleName;
+	m_widgetTheme = styleName;
+	if (S_NATIVE_STYLES.contains(m_themeName)) {
+		m_colorPalette = defaultPalette;
+	} else {
+		// If this style matches the system's current default style, use the
+		// application palette instead of standardPalette().  standardPalette()
+		// returns a hardcoded palette that ignores the platform color scheme
+		// (e.g. Breeze on Plasma always returns a dark standardPalette even
+		// when the system is set to a light color scheme).
+		auto currentDefault = QApplication::style()->objectName();
+		if (styleName.compare(currentDefault, Qt::CaseInsensitive) == 0) {
+			m_colorPalette = defaultPalette;
+		} else {
+			auto style = QStyleFactory::create(styleName);
+			m_colorPalette =
+				style != nullptr ? style->standardPalette() : defaultPalette;
+			delete style;
+		}
+	}
+}
+
+void SystemTheme::apply(bool initial)
+{
+	if (initial && S_NATIVE_STYLES.contains(m_themeName)) {
+		return;
+	}
+	ITheme::apply(initial);
+}
+
+QString SystemTheme::id()
+{
+	return m_themeName;
+}
+
+QString SystemTheme::name()
+{
+	if (m_themeName.toLower() == "windowsvista") {
+		return QObject::tr("Windows Vista");
+	} else if (m_themeName.toLower() == "windows") {
+		return QObject::tr("Windows 9x");
+	} else if (m_themeName.toLower() == "windows11") {
+		return QObject::tr("Windows 11");
+	} else if (m_themeName.toLower() == "system") {
+		return QObject::tr("System");
+	} else {
+		return m_themeName;
+	}
+}
+
+QString SystemTheme::tooltip()
+{
+	if (m_themeName.toLower() == "windowsvista") {
+		return QObject::tr("Widget style trying to look like your win32 theme");
+	} else if (m_themeName.toLower() == "windows") {
+		return QObject::tr("Windows 9x inspired widget style");
+	} else if (m_themeName.toLower() == "windows11") {
+		return QObject::tr("WinUI 3 inspired Qt widget style");
+	} else if (m_themeName.toLower() == "fusion") {
+		return QObject::tr("The default Qt widget style");
+	} else if (m_themeName.toLower() == "system") {
+		return QObject::tr("Your current system theme");
+	} else {
+		return QString();
+	}
+}
+
+QString SystemTheme::qtTheme()
+{
+	return m_widgetTheme;
+}
+
+QPalette SystemTheme::colorScheme()
+{
+	return m_colorPalette;
+}
+
+QString SystemTheme::appStyleSheet()
+{
+	return QString();
+}
+
+double SystemTheme::fadeAmount()
+{
+	return 0.5;
+}
+
+QColor SystemTheme::fadeColor()
+{
+	return QColor(128, 128, 128);
+}
+
+bool SystemTheme::hasStyleSheet()
+{
+	return false;
+}
+
+bool SystemTheme::hasColorScheme()
+{
+	return true;
+}