2 step creation for wxDocMDIChildFrame (patch 661657)

[wxWidgets.git] / include / wx / vscroll.h

diff --git a/include/wx/vscroll.h b/include/wx/vscroll.h
index a48faef6e3f52d8f7fac5962514efc634ec93e5a..1cdc9d1e485a4f55ac49b07b8c9b3ac97f10a0b6 100644 (file)
--- a/include/wx/vscroll.h
+++ b/include/wx/vscroll.h
@@ -12,6 +12,10 @@
 #ifndef _WX_VSCROLL_H_
 #define _WX_VSCROLL_H_
 
+#if defined(__GNUG__) && !defined(__APPLE__)
+#pragma interface "vscroll.h"
+#endif
+
 #include "wx/panel.h"           // base class
 
 // ----------------------------------------------------------------------------
@@ -144,6 +148,16 @@ protected:
     // usual
     virtual void OnGetLinesHint(size_t lineMin, size_t lineMax) const { }
 
+    // when the number of lines changes, we try to estimate the total height
+    // of all lines which is a rather expensive operation in terms of lines
+    // access, so if the user code may estimate the average height
+    // better/faster than we do, it should override this function to implement
+    // its own logic
+    //
+    // this function should return the best guess for the total height it may
+    // make
+    virtual wxCoord EstimateTotalHeight() const;
+
 
     // the event handlers
     void OnSize(wxSizeEvent& event);