Implement Linux native menu bar

CMakeLists.txt

@@ -10,6 +10,11 @@ option(SCRATCHCPP_PLAYER_BUILD_UNIT_TESTS "Build unit tests" ON)
 find_package(Qt6 6.6 COMPONENTS Quick QuickControls2 Widgets OpenGLWidgets REQUIRED)
 set(QT_LIBS Qt6::Quick Qt6::QuickControls2 Qt6::Widgets Qt6::OpenGLWidgets)
 
+if (LINUX)
+    find_package(Qt6 6.6 COMPONENTS DBus REQUIRED)
+    set(QT_LIBS ${QT_LIBS} Qt6::DBus)
+endif()
+
 if (SCRATCHCPP_PLAYER_BUILD_UNIT_TESTS)
     set(GTEST_DIR thirdparty/googletest)
     add_subdirectory(${PROJECT_SOURCE_DIR}/${GTEST_DIR} ${CMAKE_CURRENT_BINARY_DIR}/${GTEST_DIR})

src/ui/internal/uiengine.cpp

@@ -2,6 +2,10 @@
 
 #include <QCoreApplication>
 #include <QPushButton>
+#ifdef Q_OS_LINUX
+#include <QtDBus/QDBusConnection>
+#include <QtDBus/QDBusConnectionInterface>
+#endif
 
 #include "uiengine.h"
 
@@ -66,3 +70,24 @@ void UiEngine::setActiveFocusItem(QQuickItem *newActiveFocusItem)
     m_activeFocusItem = newActiveFocusItem;
     emit activeFocusItemChanged();
 }
+
+bool UiEngine::useNativeMenuBar() const
+{
+#if defined(Q_OS_MACOS)
+#if QT_VERSION < QT_VERSION_CHECK(6, 8, 0)
+    return true;
+#else
+    // Since Qt 6.8, Qt Quick Controls menu bar is native
+    return false;
+#endif
+#elif defined(Q_OS_LINUX)
+    const QDBusConnection connection = QDBusConnection::sessionBus();
+    static const QString registrarService = QStringLiteral("com.canonical.AppMenu.Registrar");
+    if (const auto iface = connection.interface())
+        return iface->isServiceRegistered(registrarService);
+    else
+        return false;
+#else
+    return false;
+#endif
+}

src/ui/internal/uiengine.h

@@ -19,6 +19,7 @@ class UiEngine
 {
         Q_OBJECT
         Q_PROPERTY(QQuickItem *activeFocusItem READ activeFocusItem WRITE setActiveFocusItem NOTIFY activeFocusItemChanged)
+        Q_PROPERTY(bool useNativeMenuBar READ useNativeMenuBar NOTIFY useNativeMenuBarChanged FINAL)
 
     public:
         explicit UiEngine(QObject *parent = nullptr);
@@ -34,8 +35,11 @@ class UiEngine
         QQuickItem *activeFocusItem() const;
         void setActiveFocusItem(QQuickItem *newActiveFocusItem);
 
+        bool useNativeMenuBar() const;
+
     signals:
         void activeFocusItemChanged();
+        void useNativeMenuBarChanged();
 
     private:
         static std::shared_ptr<UiEngine> m_instance;

src/uicomponents/CustomMenuBar.qml

@@ -2,6 +2,7 @@
 
 import QtQuick
 import QtQuick.Controls
+import Qt.labs.platform as Platform
 import ScratchCPP.Ui
 import ScratchCPP.UiComponents
 
@@ -22,8 +23,7 @@ MenuBar {
     }
 
     function getComponentString(typeName) {
-        //var imports = "import QtQuick; import QtQuick.Controls; import Qt.labs.platform as Platform;"
-        var imports = "import QtQuick; import QtQuick.Controls;"
+        var imports = "import QtQuick; import QtQuick.Controls; import Qt.labs.platform as Platform;"
         return imports + " " + typeName + " {}";
     }
 
@@ -103,11 +103,11 @@ MenuBar {
     }
 
     function reload() {
-        /*if(nativeMenuBarEnabled)
+        if(UiEngine.useNativeMenuBar)
         {
             root.visible = false;
             return;
-        }*/
+        }
 
         var oldObjects = [];
 
@@ -132,14 +132,14 @@ MenuBar {
 
     Component.onCompleted: reload();
 
-    /*onEnabledChanged: {
+    onEnabledChanged: {
         if(platformMenuBarLoader.active)
             platformMenuBarLoader.item.reload();
     }
 
     Loader {
         id: platformMenuBarLoader
-        active: // whether the native menu bar is active
+        active: UiEngine.useNativeMenuBar
 
         sourceComponent: Platform.MenuBar {
             id: platformMenuBar
@@ -149,14 +149,14 @@ MenuBar {
                     createMenuBar(platformMenuBar, "Platform.Menu", "Platform.MenuItem", "Platform.MenuSeparator");
             }
 
-            Connections {
-                target: QmlUtils
+            /*Connections {
+                target: // TODO: Add a class for the menu bar reload signal
                 function onMenuBarReloadTriggered() {
                     platformMenuBar.reload();
                 }
-            }
+            }*/
 
             Component.onCompleted: reload();
         }
-    }*/
+    }
 }