Extensions: Port ViewProvider of groups

src/Gui/ViewProviderDocumentObjectGroup.h

@@ -27,12 +27,14 @@
 
 #include "ViewProviderDocumentObject.h"
 #include "ViewProviderPythonFeature.h"
+#include "ViewProviderGroupExtension.h"
 
 namespace Gui {
 
-class GuiExport ViewProviderDocumentObjectGroup : public ViewProviderDocumentObject
+class GuiExport ViewProviderDocumentObjectGroup : public ViewProviderDocumentObject, 
+                                                  public ViewProviderGroupExtension
 {
-    PROPERTY_HEADER(Gui::ViewProviderDocumentObjectGroup);
+    PROPERTY_HEADER_WITH_EXTENSIONS(Gui::ViewProviderDocumentObjectGroup);
 
 public:
     /// constructor.
@@ -40,22 +42,11 @@ public:
     /// destructor.
     virtual ~ViewProviderDocumentObjectGroup();
 
-    virtual std::vector<App::DocumentObject*> claimChildren(void)const;
-    virtual bool canDragObjects() const;
-    virtual void dragObject(App::DocumentObject*);
-    virtual bool canDropObjects() const;
-    virtual void dropObject(App::DocumentObject*);
-
-    void Restore(Base::XMLReader &reader);
     QIcon getIcon(void) const;
     /// returns a list of all possible modes
     std::vector<std::string> getDisplayModes(void) const;
-    virtual void hide(void);
-    virtual void show(void);
     bool isShow(void) const;
 
-    virtual bool onDelete(const std::vector<std::string> &);
-
     /// get called if the user hover over a object in the tree
     virtual bool allowDrop(const std::vector<const App::DocumentObject*> &objList,
                            Qt::KeyboardModifiers keys,
@@ -71,7 +62,6 @@ protected:
     void getViewProviders(std::vector<ViewProviderDocumentObject*>&) const;
 
 private:
-    bool visible; // helper variable
     std::vector<ViewProvider*> nodes;
 };