added virtual list control functions (but not implemented them yet) to the native wxListCtrl

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@10842 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/listctrl.h

@@ -122,6 +122,8 @@ public:
     bool DeleteAllColumns();
     bool DeleteColumn( int col );
 
+    void SetItemCount(long count);
+
     void EditLabel( long item ) { Edit(item); }
     void Edit( long item );
 
@@ -141,6 +143,9 @@ public:
     bool SortItems( wxListCtrlCompare fn, long data );
     bool Update( long item );
 
+    // returns true if it is a virtual list control
+    bool IsVirtual() const { return (GetWindowStyle() & wxLC_VIRTUAL) != 0; }
+
     void OnIdle( wxIdleEvent &event );
     void OnSize( wxSizeEvent &event );
 
@@ -173,6 +178,16 @@ public:
     wxListHeaderWindow  *m_headerWin;
     wxListMainWindow    *m_mainWin;
 
+protected:
+    // return the text for the given column of the given item
+    virtual wxString OnGetItemText(long item, long column) const;
+
+    // return the icon for the given item
+    virtual int OnGetItemImage(long item) const;
+
+    // it calls our OnGetXXX() functions
+    friend wxListMainWindow;
+
 private:
     DECLARE_EVENT_TABLE()
     DECLARE_DYNAMIC_CLASS(wxListCtrl);