QmlDesigner: Add notification blocker

Change-Id: I9609437a7190f92cc208d56cff57c5b35ef57beb
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>

src/plugins/qmldesigner/designercore/include/abstractview.h

@@ -284,6 +284,23 @@ public:
     bool isEnabled() const;
     void setEnabled(bool b);
 
+    bool isBlockingNotifications() const { return m_isBlockingNotifications; }
+
+    class NotificationBlocker
+    {
+    public:
+        NotificationBlocker(AbstractView *view)
+            : m_view{view}
+        {
+            m_view->m_isBlockingNotifications = true;
+        }
+
+        ~NotificationBlocker() { m_view->m_isBlockingNotifications = false; }
+
+    private:
+        AbstractView *m_view;
+    };
+
 protected:
     void setModel(Model * model);
     void removeModel();
@@ -296,10 +313,11 @@ protected:
 
 private: //functions
     QList<ModelNode> toModelNodeList(const QList<Internal::InternalNodePointer> &nodeList) const;
-    bool m_enabled = true;
 
 private:
     QPointer<Model> m_model;
+    bool m_enabled = true;
+    bool m_isBlockingNotifications = false;
 };
 
 QMLDESIGNERCORE_EXPORT QList<Internal::InternalNodePointer> toInternalNodeList(const QList<ModelNode> &nodeList);

src/plugins/qmldesigner/designercore/model/model.cpp

@@ -397,17 +397,19 @@ void ModelPrivate::notifyNodeInstanceViewLast(Callable call)
     QString description;
 
     try {
-        if (rewriterView())
+        if (rewriterView() && !rewriterView()->isBlockingNotifications())
             call(rewriterView());
     } catch (const RewritingException &e) {
         description = e.description();
         resetModel = true;
     }
 
-    for (QPointer<AbstractView> view : enabledViews())
+    for (QPointer<AbstractView> view : enabledViews()) {
+        if (!view->isBlockingNotifications())
             call(view.data());
+    }
 
-    if (nodeInstanceView())
+    if (nodeInstanceView() && !nodeInstanceView()->isBlockingNotifications())
         call(nodeInstanceView());
 
     if (resetModel)
@@ -421,18 +423,20 @@ void ModelPrivate::notifyNormalViewsLast(Callable call)
     QString description;
 
     try {
-        if (rewriterView())
+        if (rewriterView() && !rewriterView()->isBlockingNotifications())
             call(rewriterView());
     } catch (const RewritingException &e) {
         description = e.description();
         resetModel = true;
     }
 
-    if (nodeInstanceView())
+    if (nodeInstanceView() && !nodeInstanceView()->isBlockingNotifications())
         call(nodeInstanceView());
 
-    for (QPointer<AbstractView> view : enabledViews())
+    for (QPointer<AbstractView> view : enabledViews()) {
+        if (!view->isBlockingNotifications())
             call(view.data());
+    }
 
     if (resetModel)
         resetModelByRewriter(description);
@@ -441,9 +445,11 @@ void ModelPrivate::notifyNormalViewsLast(Callable call)
 template<typename Callable>
 void ModelPrivate::notifyInstanceChanges(Callable call)
 {
-    for (QPointer<AbstractView> view : enabledViews())
+    for (QPointer<AbstractView> view : enabledViews()) {
+        if (!view->isBlockingNotifications())
             call(view.data());
     }
+}
 
 void ModelPrivate::notifyAuxiliaryDataChanged(const InternalNodePointer &internalNode,
                                               const PropertyName &name,