QmlDesigner: Fix for MCUs styles combobox

Task-number: QDS-11258
Change-Id: Ib1399e111daf14856e3e679619978180ba7da088
Reviewed-by: Aleksei German <aleksei.german@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Qt CI Patch Build Bot <ci_patchbuild_bot@qt.io>

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

@@ -2,7 +2,6 @@
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
 #include "changestyleaction.h"
-#include "designermcumanager.h"
 
 #include <projectexplorer/project.h>
 #include <projectexplorer/projectmanager.h>
@@ -47,6 +46,17 @@ static QString styleConfigFileName(const QString &qmlFileName)
     return QString();
 }
 
+static bool isQtForMCUs()
+{
+    if (ProjectExplorer::ProjectManager::startupTarget()) {
+        const QmlProjectManager::QmlBuildSystem *buildSystem = qobject_cast<QmlProjectManager::QmlBuildSystem *>(
+            ProjectExplorer::ProjectManager::startupTarget()->buildSystem());
+        if (buildSystem)
+            return buildSystem->qtForMCUs();
+    }
+    return false;
+}
+
 ChangeStyleWidgetAction::ChangeStyleWidgetAction(QObject *parent) : QWidgetAction(parent)
 {
     items = getAllStyleItems();
@@ -78,7 +88,7 @@ QList<StyleWidgetEntry> ChangeStyleWidgetAction::getAllStyleItems()
     if (Utils::HostOsInfo::isWindowsHost())
         items.append({"Windows", "Windows", {}});
 
-    if (DesignerMcuManager::instance().isMCUProject())
+    if (isQtForMCUs())
         items.append({"MCUDefaultStyle", "MCUDefaultStyle", {}});
 
     //what if we have a custom style set in .conf?
@@ -178,7 +188,7 @@ QWidget *ChangeStyleWidgetAction::createWidget(QWidget *parent)
             comboBox->setDisabled(true);
             comboBox->setToolTip(tr(disbledTooltip));
             comboBox->setCurrentIndex(0);
-        } else if (DesignerMcuManager::instance().isMCUProject()) {
+        } else if (isQtForMCUs()) {
             comboBox->setDisabled(true);
             comboBox->setEditText(style);
         } else {

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

@@ -353,8 +353,9 @@ ToolBarBackend::ToolBarBackend(QObject *parent)
             [this](ProjectExplorer::Project *project) {
                 disconnect(m_kitConnection);
                 emit isQt6Changed();
-                emit isMCUsChanged();
                 emit projectOpenedChanged();
+                emit stylesChanged();
+                emit isMCUsChanged();
                 if (project) {
                     m_kitConnection = connect(project,
                                               &ProjectExplorer::Project::activeTargetChanged,

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

@@ -84,7 +84,7 @@ class ToolBarBackend : public QObject
     Q_PROPERTY(int documentIndex READ documentIndex NOTIFY documentIndexChanged)
     Q_PROPERTY(QString currentWorkspace READ currentWorkspace NOTIFY currentWorkspaceChanged)
     Q_PROPERTY(bool lockWorkspace READ lockWorkspace WRITE setLockWorkspace NOTIFY lockWorkspaceChanged)
-    Q_PROPERTY(QStringList styles READ styles CONSTANT)
+    Q_PROPERTY(QStringList styles READ styles NOTIFY stylesChanged)
     Q_PROPERTY(bool isInDesignMode READ isInDesignMode NOTIFY isInDesignModeChanged)
     Q_PROPERTY(bool isInEditMode READ isInEditMode NOTIFY isInEditModeChanged)
     Q_PROPERTY(bool isInSessionMode READ isInSessionMode NOTIFY isInSessionModeChanged)
@@ -151,6 +151,7 @@ signals:
     void documentIndexChanged();
     void currentWorkspaceChanged();
     void lockWorkspaceChanged();
+    void stylesChanged();
     void isInDesignModeChanged();
     void isInEditModeChanged();
     void isInSessionModeChanged();