QmlDesigner: Extend ToolBar backend for MCUs

Task-number: QDS-10338
Change-Id: I552cb25b9690a0c5dd202d99e8220453225bcd3b
Reviewed-by: Qt CI Patch Build Bot <ci_patchbuild_bot@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/plugins/qmldesigner/components/componentcore/changestyleaction.cpp

@@ -14,7 +14,8 @@ namespace QmlDesigner {
 
 static QString styleConfigFileName(const QString &qmlFileName)
 {
-    ProjectExplorer::Project *currentProject = ProjectExplorer::ProjectManager::projectForFile(Utils::FilePath::fromString(qmlFileName));
+    ProjectExplorer::Project *currentProject = ProjectExplorer::ProjectManager::projectForFile(
+        Utils::FilePath::fromString(qmlFileName));
 
     if (currentProject) {
         const QList<Utils::FilePath> fileNames = currentProject->files(
@@ -58,6 +59,11 @@ QList<StyleWidgetEntry> ChangeStyleWidgetAction::getAllStyleItems()
     if (Utils::HostOsInfo::isWindowsHost())
         items.append({"Windows", "Windows", {}});
 
+    if (DesignerMcuManager::instance().isMCUProject())
+        items.append({"MCUDefaultStyle", "MCUDefaultStyle", {}});
+
+    //what if we have a custom style set in .conf?
+
     return items;
 }
 
@@ -155,7 +161,6 @@ QWidget *ChangeStyleWidgetAction::createWidget(QWidget *parent)
             comboBox->setCurrentIndex(0);
         } else if (DesignerMcuManager::instance().isMCUProject()) {
             comboBox->setDisabled(true);
-            //TODO: add tooltip regarding MCU limitations, however we are behind string freeze
             comboBox->setEditText(style);
         } else {
             comboBox->setDisabled(false);

src/plugins/qmldesigner/components/toolbar/toolbarbackend.cpp

@@ -353,6 +353,7 @@ ToolBarBackend::ToolBarBackend(QObject *parent)
             [this](ProjectExplorer::Project *project) {
                 disconnect(m_kitConnection);
                 emit isQt6Changed();
+                emit isMCUsChanged();
                 emit projectOpenedChanged();
                 if (project) {
                     m_kitConnection = connect(project,
@@ -701,6 +702,20 @@ bool ToolBarBackend::isQt6() const
     return isQt6Project;
 }
 
+bool ToolBarBackend::isMCUs() const
+{
+    if (!ProjectExplorer::ProjectManager::startupTarget())
+        return false;
+
+    const QmlProjectManager::QmlBuildSystem *buildSystem = qobject_cast<QmlProjectManager::QmlBuildSystem *>(
+        ProjectExplorer::ProjectManager::startupTarget()->buildSystem());
+    QTC_ASSERT(buildSystem, return false);
+
+    const bool isQtForMCUsProject = buildSystem && buildSystem->qtForMCUs();
+
+    return isQtForMCUsProject;
+}
+
 bool ToolBarBackend::projectOpened() const
 {
     return ProjectExplorer::ProjectManager::instance()->startupProject();

src/plugins/qmldesigner/components/toolbar/toolbarbackend.h

@@ -93,6 +93,7 @@ class ToolBarBackend : public QObject
     Q_PROPERTY(QStringList kits READ kits NOTIFY kitsChanged)
     Q_PROPERTY(int currentKit READ currentKit NOTIFY currentKitChanged)
     Q_PROPERTY(bool isQt6 READ isQt6 NOTIFY isQt6Changed)
+    Q_PROPERTY(bool isMCUs READ isMCUs NOTIFY isMCUsChanged)
     Q_PROPERTY(bool projectOpened READ projectOpened NOTIFY projectOpenedChanged)
 
 public:
@@ -138,6 +139,7 @@ public:
     int currentKit() const;
 
     bool isQt6() const;
+    bool isMCUs() const;
 
     bool projectOpened() const;
 
@@ -157,6 +159,7 @@ signals:
     void kitsChanged();
     void currentKitChanged();
     void isQt6Changed();
+    void isMCUsChanged();
     void projectOpenedChanged();
 
 private: