added virtual listctrl support

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@10837 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/listctrl.h

@@ -215,12 +215,6 @@ public:
     // Returns the item or -1 if unsuccessful.
     long GetNextItem(long item, int geometry = wxLIST_NEXT_ALL, int state = wxLIST_STATE_DONTCARE) const ;
 
-    // Implementation: converts wxWindows style to MSW style.
-    // Can be a single style flag or a bit list.
-    // oldStyle is 'normalised' so that it doesn't contain
-    // conflicting styles.
-    long ConvertToMSWStyle(long& oldStyle, long style) const;
-
     // Gets one of the three image lists
     wxImageList *GetImageList(int which) const ;
 
@@ -234,6 +228,9 @@ public:
     void SetImageList(wxImageList *imageList, int which) ;
     void AssignImageList(wxImageList *imageList, int which) ;
 
+    // returns true if it is a virtual list control
+    bool IsVirtual() const { return (GetWindowStyle() & wxLC_VIRTUAL) != 0; }
+
     // Operations
     ////////////////////////////////////////////////////////////////////////////
 
@@ -301,6 +298,9 @@ public:
                       int format = wxLIST_FORMAT_LEFT,
                       int width = -1);
 
+    // set the number of items in a virtual list control
+    void SetItemCount(long count);
+
     // Scrolls the list control. If in icon, small icon or report view mode,
     // x specifies the number of pixels to scroll. If in list view mode, x
     // specifies the number of columns to scroll.
@@ -328,9 +328,11 @@ public:
     // bring the control in sync with current m_windowStyle value
     void UpdateStyle();
 
-    // Add to pool: necessary because Windows needs to have a string
-    // still exist across 3 callbacks.
-    wxChar *AddPool(const wxString& str);
+    // Implementation: converts wxWindows style to MSW style.
+    // Can be a single style flag or a bit list.
+    // oldStyle is 'normalised' so that it doesn't contain
+    // conflicting styles.
+    long ConvertToMSWStyle(long& oldStyle, long style) const;
 
     // Event handlers
     ////////////////////////////////////////////////////////////////////////////
@@ -353,7 +355,6 @@ protected:
                       m_ownsImageListState;
 
     long              m_baseStyle;  // Basic Windows style flags, for recreation purposes
-    wxStringList      m_stringPool; // Pool of 3 strings to satisfy Windows callback requirements
     int               m_colCount;   // Windows doesn't have GetColumnCount so must
                                     // keep track of inserted/deleted columns
 
@@ -363,6 +364,15 @@ protected:
     // TRUE if we have any items with custom attributes
     bool m_hasAnyAttr;
 
+    // these functions are only used for virtual list view controls, i.e. the
+    // ones with wxLC_VIRTUAL style
+
+    // 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;
+
 private:
     bool DoCreateControl(int x, int y, int w, int h);