Gui::Add mergeoverlay function to ViewProviderExtension

src/Gui/ViewProvider.cpp

@@ -271,7 +271,15 @@ QIcon ViewProvider::getIcon(void) const
 
 QIcon ViewProvider::mergeOverlayIcons (const QIcon & orig) const
 {
-    return orig;
+    auto vector = getExtensionsDerivedFromType<Gui::ViewProviderExtension>();
+
+    QIcon overlayedIcon = orig;
+
+    for (Gui::ViewProviderExtension* ext : vector) {
+        overlayedIcon = ext->extensionMergeOverlayIcons(overlayedIcon);
+    }
+
+    return overlayedIcon;
 }
 
 void ViewProvider::setTransformation(const Base::Matrix4D &rcMatrix)
@@ -500,21 +508,6 @@ void addNodes(Graph& graph, std::map<SoNode*, Vertex>& vertexNodeMap, SoNode* no
 }
 }
 
-QIcon ViewProvider::mergePixmap (const QIcon &base, const QPixmap &px, Gui::BitmapFactoryInst::Position position) const
-{
-    QIcon overlayedIcon;
-
-    int w = QApplication::style()->pixelMetric(QStyle::PM_ListViewIconSize);
-
-    overlayedIcon.addPixmap(Gui::BitmapFactory().merge(base.pixmap(w, w, QIcon::Normal, QIcon::Off),
-                                                  px,position), QIcon::Normal, QIcon::Off);
-
-    overlayedIcon.addPixmap(Gui::BitmapFactory().merge(base.pixmap(w, w, QIcon::Normal, QIcon::On ),
-                                                  px,position), QIcon::Normal, QIcon::Off);
-
-    return overlayedIcon;
-}
-
 bool ViewProvider::checkRecursion(SoNode* node)
 {
     if (node->getTypeId().isDerivedFrom(SoGroup::getClassTypeId())) {

src/Gui/ViewProvider.h

@@ -32,7 +32,6 @@
 #include <boost/signals2.hpp>
 
 #include <App/TransactionalObject.h>
-#include <Gui/BitmapFactory.h>
 #include <Base/Vector3D.h>
 
 class SbVec2s;
@@ -371,10 +370,6 @@ protected:
      */
     virtual QIcon mergeOverlayIcons (const QIcon & orig) const;
 
-    /// Helper method to merge a pixmap into one corner of a QIcon
-    QIcon mergePixmap (const QIcon &base, const QPixmap &px, Gui::BitmapFactoryInst::Position position) const;
-
-
 protected:
     /// The root Separator of the ViewProvider
     SoSeparator *pcRoot;

src/Gui/ViewProviderExtension.h

@@ -29,10 +29,10 @@
 #include "ViewProviderDocumentObject.h"
 
 namespace Gui {
-    
+
 /**
  * @brief Extension with special viewprovider calls
- * 
+ *
  */
 class GuiExport ViewProviderExtension : public App::Extension
 {
@@ -48,13 +48,13 @@ public:
 
     Gui::ViewProviderDocumentObject*       getExtendedViewProvider();
     const Gui::ViewProviderDocumentObject* getExtendedViewProvider() const;
-   
-    virtual std::vector<App::DocumentObject*> extensionClaimChildren3D(void) const { 
+
+    virtual std::vector<App::DocumentObject*> extensionClaimChildren3D(void) const {
         return std::vector<App::DocumentObject*>(); }
-        
+
     virtual bool extensionOnDelete(const std::vector<std::string> &){ return true;}
- 
-    virtual std::vector<App::DocumentObject*> extensionClaimChildren(void) const { 
+
+    virtual std::vector<App::DocumentObject*> extensionClaimChildren(void) const {
         return std::vector<App::DocumentObject*>(); }
 
     virtual bool extensionCanDragObjects() const { return false; }
@@ -69,7 +69,7 @@ public:
     virtual void extensionHide(void) { }
     /// Shows the view provider
     virtual void extensionShow(void) { }
-    
+
     virtual SoSeparator* extensionGetFrontRoot(void) const {return nullptr;}
     virtual SoGroup*     extensionGetChildRoot(void) const {return nullptr;}
     virtual SoSeparator* extensionGetBackRoot(void) const {return nullptr;}
@@ -79,7 +79,9 @@ public:
 
     //update data of extended opject
     virtual void extensionUpdateData(const App::Property*);
-    
+
+    virtual QIcon extensionMergeOverlayIcons(const QIcon & orig) const {return orig;}
+
 private:
   //Gui::ViewProviderDocumentObject* m_viewBase = nullptr;
 };
@@ -95,11 +97,11 @@ class ViewProviderExtensionPythonT : public ExtensionT
 
 public:
     typedef ExtensionT Inherited;
-    
+
     ViewProviderExtensionPythonT() {
         ExtensionT::m_isPythonExtension = true;
         ExtensionT::initExtensionType(ViewProviderExtensionPythonT::getExtensionClassTypeId());
-        
+
         EXTENSION_ADD_PROPERTY(ExtensionProxy,(Py::Object()));
     }
     virtual ~ViewProviderExtensionPythonT() {