QmlDesigner: Add instance to ConnectionView and make methods public

This allows to use the model from the property editor.
We do not implement the instance as singleton but use the View Manager.

Change-Id: I2d95235a31d4a776411336ef82ace0f230c9971f
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/plugins/qmldesigner/components/connectioneditor/connectionview.cpp

@@ -35,6 +35,10 @@
 #include <nodeabstractproperty.h>
 #include <variantproperty.h>
 #include <signalhandlerproperty.h>
+#include <qmldesignerplugin.h>
+#include <viewmanager.h>
+
+#include <utils/qtcassert.h>
 
 #include <QTableView>
 
@@ -268,6 +272,25 @@ BackendModel *ConnectionView::backendModel() const
     return m_backendModel;
 }
 
+ConnectionView *ConnectionView::instance()
+{
+
+    static ConnectionView *s_instance = nullptr;
+
+    if (s_instance)
+        return s_instance;
+
+    const auto views = QmlDesignerPlugin::instance()->viewManager().views();
+    for (auto *view : views) {
+        ConnectionView *myView = qobject_cast<ConnectionView*>(view);
+        if (myView)
+            s_instance =  myView;
+    }
+
+    QTC_ASSERT(s_instance, return nullptr);
+    return s_instance;
+}
+
 } // namesapce Internal
 
 } // namespace QmlDesigner

src/plugins/qmldesigner/components/connectioneditor/connectionview.h

@@ -83,13 +83,14 @@ public:
     QTableView *dynamicPropertiesTableView() const;
     QTableView *backendView() const;
 
-protected:
+    DynamicPropertiesModel *dynamicPropertiesModel() const;
+
     ConnectionViewWidget *connectionViewWidget() const;
     ConnectionModel *connectionModel() const;
     BindingModel *bindingModel() const;
-    DynamicPropertiesModel *dynamicPropertiesModel() const;
     BackendModel *backendModel() const;
 
+    static ConnectionView *instance();
 
 private: //variables
     QPointer<ConnectionViewWidget> m_connectionViewWidget;