refs #674, code for hover/drop indicator

* item delegate for callback to view for hover
* proxy style for draw drop indicator as primitive
* added functions to view base for hover / callbacks
* highlight hover row in model

src/blackgui/models/listmodelbase.h

@@ -108,6 +108,9 @@ namespace BlackGui
             //! Model about to be destroyed?
             bool isModelDestroyed();
 
+            //! Hovered role
+            void setHoveredRow(int row);
+
             //! Drop actions
             void setDropActions(Qt::DropActions dropActions) { this->m_dropActions = dropActions; }
 
@@ -161,6 +164,9 @@ namespace BlackGui
             //! Helper method with template free signature
             virtual int performUpdateContainer(const BlackMisc::CVariant &variant, bool sort) = 0;
 
+            //! Row to be hovered?
+            bool isHoveredRow(int row) const;
+
             //! Row to be hovered?
             bool isHoveredRow(const QModelIndex &modelIndex) const;