Document wxDataViewListModel as common abstract base class for

wxDataViewIndexListModel and wxDataViewVirtualListModel.

Add wxDataViewListModel::GetCount() as both have it.



git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65539 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/dataview.h

@@ -305,6 +305,8 @@ public:
     // helper methods provided by list models only
     virtual unsigned GetRow( const wxDataViewItem &item ) const = 0;
 
+    // returns the number of rows 
+    virtual unsigned int GetCount() const = 0;
 
     // implement some base class pure virtual directly
     virtual wxDataViewItem
@@ -339,6 +341,7 @@ public:
         return GetAttrByRow( GetRow(item), col, attr );
     }
 
+
     virtual bool IsListModel() const { return true; }
 };