don't pass NULL pointer to printf(), this crashes Solaris printf

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

diff --git a/include/wx/vscroll.h b/include/wx/vscroll.h
index a48faef6e3f52d8f7fac5962514efc634ec93e5a..5ac9a142c0d4804b362626f42fe7368e4df3e62d 100644 (file)
--- a/include/wx/vscroll.h
+++ b/include/wx/vscroll.h
@@ -5,13 +5,17 @@
 // Modified by:
 // Created:     30.05.03
 // RCS-ID:      $Id$
-// Copyright:   (c) 2003 Vadim Zeitlin <vadim@wxwindows.org>
+// Copyright:   (c) 2003 Vadim Zeitlin <vadim@wxwidgets.org>
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 #ifndef _WX_VSCROLL_H_
 #define _WX_VSCROLL_H_
 
+#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
+#pragma interface "vscroll.h"
+#endif
+
 #include "wx/panel.h"           // base class
 
 // ----------------------------------------------------------------------------
@@ -91,10 +95,10 @@ public:
     virtual bool ScrollPages(int pages);
 
     // redraw the specified line
-    void RefreshLine(size_t line);
+    virtual void RefreshLine(size_t line);
 
     // redraw all lines in the specified range (inclusive)
-    void RefreshLines(size_t from, size_t to);
+    virtual void RefreshLines(size_t from, size_t to);
 
     // return the item at the specified (in physical coordinates) position or.
 
@@ -114,14 +118,26 @@ public:
     size_t GetLineCount() const { return m_lineMax; }
 
     // get the first currently visible line
-    size_t GetFirstVisibleLine() const { return m_lineFirst; }
+    size_t GetVisibleBegin() const { return m_lineFirst; }
 
-    // get the last currently visible line
-    size_t GetLastVisibleLine() const { return m_lineFirst + m_nVisible - 1; }
+    // get the first currently visible line
+    size_t GetVisibleEnd() const { return m_lineFirst + m_nVisible; }
 
     // is this line currently visible?
     bool IsVisible(size_t line) const
-        { return line >= m_lineFirst && line <= GetLastVisibleLine(); }
+        { return line >= GetVisibleBegin() && line < GetVisibleEnd(); }
+
+
+    // this is the same as GetVisibleBegin(), exists to match
+    // GetLastVisibleLine() and for backwards compatibility only
+    size_t GetFirstVisibleLine() const { return m_lineFirst; }
+
+    // get the last currently visible line
+    //
+    // this function is unsafe as it returns (size_t)-1 (i.e. a huge positive
+    // number) if the control is empty, use GetVisibleEnd() instead, this one
+    // is kept for backwards compatibility
+    size_t GetLastVisibleLine() const { return GetVisibleEnd() - 1; }
 
 
 protected:
@@ -142,12 +158,26 @@ protected:
     //
     // finally note that lineMin is inclusive, while lineMax is exclusive, as
     // usual
-    virtual void OnGetLinesHint(size_t lineMin, size_t lineMax) const { }
+    virtual void OnGetLinesHint(size_t WXUNUSED(lineMin),
+                                size_t WXUNUSED(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);
     void OnScroll(wxScrollWinEvent& event);
+#if wxUSE_MOUSEWHEEL
+    void OnMouseWheel(wxMouseEvent& event);
+#endif
 
     // find the index of the line we need to show at the top of the window such
     // that the last (fully or partially) visible line is the given one
@@ -178,8 +208,14 @@ private:
     // partly, visible one)
     size_t m_nVisible;
 
+    // accumulated mouse wheel rotation
+#if wxUSE_MOUSEWHEEL
+    int m_sumWheelRotation;
+#endif
 
     DECLARE_EVENT_TABLE()
+    DECLARE_NO_COPY_CLASS(wxVScrolledWindow)
+    DECLARE_ABSTRACT_CLASS(wxVScrolledWindow)
 };
 
 #endif // _WX_VSCROLL_H_