fix for discrepancies between wxNotebookEvent and wxNotebook GetSelection() results

[wxWidgets.git] / src / generic / scrolwin.cpp

diff --git a/src/generic/scrolwin.cpp b/src/generic/scrolwin.cpp
index 4b99809f81ba11584b9e0ebe79025c357e936d8a..7cd7722062a273c044c7f7da2df08bd1801b7eb2 100644 (file)
--- a/src/generic/scrolwin.cpp
+++ b/src/generic/scrolwin.cpp
@@ -1,46 +1,87 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        scrolwin.cpp
-// Purpose:     wxScrolledWindow implementation
+// Name:        generic/scrolwin.cpp
+// Purpose:     wxGenericScrolledWindow implementation

 // Author:      Julian Smart
 // Modified by:
 // Created:     01/02/97
 // RCS-ID:      $Id$
 // Copyright:   (c) Julian Smart and Markus Holzem
 // Author:      Julian Smart
 // Modified by:
 // Created:     01/02/97
 // RCS-ID:      $Id$
 // Copyright:   (c) Julian Smart and Markus Holzem

-// Licence:    wxWindows license
+// Licence:     wxWindows license

 /////////////////////////////////////////////////////////////////////////////
 
 /////////////////////////////////////////////////////////////////////////////
 

+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+

 #ifdef __GNUG__
 #ifdef __GNUG__

-#pragma implementation
-#pragma implementation "scrolwin.h"
+    #pragma implementation "scrolwin.h"
+#endif
+
+#ifdef __VMS
+#define XtDisplay XTDISPLAY

 #endif
 
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 #endif
 
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 

+#ifdef __BORLANDC__
+    #pragma hdrstop
+#endif
+

 #include "wx/utils.h"
 #include "wx/dcclient.h"
 
 #include "wx/utils.h"
 #include "wx/dcclient.h"
 

+#include "wx/generic/scrolwin.h"
+#include "wx/panel.h"
+

 #ifdef __WXMSW__
 #ifdef __WXMSW__

-#include "windows.h"
+    #include "windows.h"

 #endif
 
 #endif
 

-#ifdef __BORLANDC__
-#pragma hdrstop
+#ifdef __WXMOTIF__
+// For wxRETAINED implementation
+#ifdef __VMS__ //VMS's Xm.h is not (yet) compatible with C++
+               //This code switches off the compiler warnings
+# pragma message disable nosimpint
+#endif
+#include <Xm/Xm.h>
+#ifdef __VMS__
+# pragma message enable nosimpint
+#endif

 #endif
 
 #endif
 

-#include "wx/generic/scrolwin.h"
+#ifndef __WXGTK__
+#include "wx/scrolwin.h"
+IMPLEMENT_CLASS(wxScrolledWindow, wxGenericScrolledWindow)
+#endif
+
+// ----------------------------------------------------------------------------
+// event tables
+// ----------------------------------------------------------------------------

 
 

-#if !USE_SHARED_LIBRARY
-BEGIN_EVENT_TABLE(wxScrolledWindow, wxWindow)
-    EVT_SCROLL(wxScrolledWindow::OnScroll)
-    EVT_SIZE(wxScrolledWindow::OnSize)
-    EVT_PAINT(wxScrolledWindow::OnPaint)
+BEGIN_EVENT_TABLE(wxGenericScrolledWindow, wxPanel)
+    EVT_SCROLLWIN(wxGenericScrolledWindow::OnScroll)
+    EVT_SIZE(wxGenericScrolledWindow::OnSize)
+    EVT_PAINT(wxGenericScrolledWindow::OnPaint)
+    EVT_CHAR(wxGenericScrolledWindow::OnChar)
+    EVT_MOUSEWHEEL(wxGenericScrolledWindow::OnMouseWheel)

 END_EVENT_TABLE()
 
 END_EVENT_TABLE()
 

-IMPLEMENT_DYNAMIC_CLASS(wxScrolledWindow, wxWindow)
-#endif
+IMPLEMENT_DYNAMIC_CLASS(wxGenericScrolledWindow, wxPanel)
+
+// ============================================================================
+// implementation
+// ============================================================================

 
 

-wxScrolledWindow::wxScrolledWindow(void)
+// ----------------------------------------------------------------------------
+// wxGenericScrolledWindow creation
+// ----------------------------------------------------------------------------
+
+wxGenericScrolledWindow::wxGenericScrolledWindow()

 {
     m_xScrollPixelsPerLine = 0;
     m_yScrollPixelsPerLine = 0;
 {
     m_xScrollPixelsPerLine = 0;
     m_yScrollPixelsPerLine = 0;


@@ -54,13 +95,16 @@ wxScrolledWindow::wxScrolledWindow(void)
     m_yScrollLinesPerPage = 0;
     m_scaleX = 1.0;
     m_scaleY = 1.0;
     m_yScrollLinesPerPage = 0;
     m_scaleX = 1.0;
     m_scaleY = 1.0;

+    m_wheelRotation = 0;
+    m_targetWindow = (wxWindow*) NULL;

 }
 
 }
 

-bool wxScrolledWindow::Create(wxWindow *parent, wxWindowID id,
-           const wxPoint& pos,
-           const wxSize& size,
-           long style,
-           const wxString& name)
+bool wxGenericScrolledWindow::Create(wxWindow *parent,
+                              wxWindowID id,
+                              const wxPoint& pos,
+                              const wxSize& size,
+                              long style,
+                              const wxString& name)

 {
     m_xScrollPixelsPerLine = 0;
     m_yScrollPixelsPerLine = 0;
 {
     m_xScrollPixelsPerLine = 0;
     m_yScrollPixelsPerLine = 0;


@@ -74,54 +118,138 @@ bool wxScrolledWindow::Create(wxWindow *parent, wxWindowID id,
     m_yScrollLinesPerPage = 0;
     m_scaleX = 1.0;
     m_scaleY = 1.0;
     m_yScrollLinesPerPage = 0;
     m_scaleX = 1.0;
     m_scaleY = 1.0;

+    m_wheelRotation = 0;
+
+    m_targetWindow = this;

 
 

-    return wxWindow::Create(parent, id, pos, size, style, name);
+    bool ok = wxPanel::Create(parent, id, pos, size, style, name);
+
+#ifdef __WXMSW__
+    // we need to process arrows ourselves for scrolling
+    m_lDlgCode |= DLGC_WANTARROWS;
+#endif // __WXMSW__
+
+    return ok;

 }
 
 }
 

+wxGenericScrolledWindow::~wxGenericScrolledWindow()
+{
+}
+
+// ----------------------------------------------------------------------------
+// setting scrolling parameters
+// ----------------------------------------------------------------------------
+

 /*
  * pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
  * noUnitsX/noUnitsY:        : no. units per scrollbar
  */
 /*
  * pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
  * noUnitsX/noUnitsY:        : no. units per scrollbar
  */

-void wxScrolledWindow::SetScrollbars (int pixelsPerUnitX, int pixelsPerUnitY,
-              int noUnitsX, int noUnitsY,
-              int xPos, int yPos, bool noRefresh )
+void wxGenericScrolledWindow::SetScrollbars (int pixelsPerUnitX, int pixelsPerUnitY,
+               int noUnitsX, int noUnitsY,
+               int xPos, int yPos, bool noRefresh )

 {
 {

+    int xpos, ypos;
+
+    CalcUnscrolledPosition(xPos, yPos, &xpos, &ypos);

     bool do_refresh =
     (
       (noUnitsX != 0 && m_xScrollLines == 0) ||
     bool do_refresh =
     (
       (noUnitsX != 0 && m_xScrollLines == 0) ||

-      (noUnitsX < m_xScrollPosition) ||
+      (noUnitsX < m_xScrollLines && xpos > pixelsPerUnitX*noUnitsX) ||
+

       (noUnitsY != 0 && m_yScrollLines == 0) ||
       (noUnitsY != 0 && m_yScrollLines == 0) ||

-      (noUnitsY < m_yScrollPosition) ||
+      (noUnitsY < m_yScrollLines && ypos > pixelsPerUnitY*noUnitsY) ||

       (xPos != m_xScrollPosition) ||
       (xPos != m_xScrollPosition) ||

-      (yPos != m_yScrollPosition) ||
-      (pixelsPerUnitX != m_xScrollPixelsPerLine) ||
-      (pixelsPerUnitY != m_yScrollPixelsPerLine)
+      (yPos != m_yScrollPosition)
+//       (pixelsPerUnitX != m_xScrollPixelsPerLine) ||
+//       (pixelsPerUnitY != m_yScrollPixelsPerLine)

     );
     );

-      
+

     m_xScrollPixelsPerLine = pixelsPerUnitX;
     m_yScrollPixelsPerLine = pixelsPerUnitY;
     m_xScrollPosition = xPos;
     m_yScrollPosition = yPos;
     m_xScrollLines = noUnitsX;
     m_yScrollLines = noUnitsY;
     m_xScrollPixelsPerLine = pixelsPerUnitX;
     m_yScrollPixelsPerLine = pixelsPerUnitY;
     m_xScrollPosition = xPos;
     m_yScrollPosition = yPos;
     m_xScrollLines = noUnitsX;
     m_yScrollLines = noUnitsY;

-      
+
+#ifdef __WXMOTIF__
+    // Sorry, some Motif-specific code to implement a backing pixmap
+    // for the wxRETAINED style. Implementing a backing store can't
+    // be entirely generic because it relies on the wxWindowDC implementation
+    // to duplicate X drawing calls for the backing pixmap.
+
+    if ((m_windowStyle & wxRETAINED) == wxRETAINED)
+    {
+        Display* dpy = XtDisplay((Widget) GetMainWidget());
+
+        int totalPixelWidth = m_xScrollLines * m_xScrollPixelsPerLine;
+        int totalPixelHeight = m_yScrollLines * m_yScrollPixelsPerLine;
+        if (m_backingPixmap &&
+           !((m_pixmapWidth == totalPixelWidth) &&
+             (m_pixmapHeight == totalPixelHeight)))
+        {
+            XFreePixmap (dpy, (Pixmap) m_backingPixmap);
+            m_backingPixmap = (WXPixmap) 0;
+        }
+
+        if (!m_backingPixmap &&
+           (noUnitsX != 0) && (noUnitsY != 0))
+        {
+            int depth = wxDisplayDepth();
+            m_pixmapWidth = totalPixelWidth;
+            m_pixmapHeight = totalPixelHeight;
+            m_backingPixmap = (WXPixmap) XCreatePixmap (dpy, RootWindow (dpy, DefaultScreen (dpy)),
+            m_pixmapWidth, m_pixmapHeight, depth);
+        }
+
+    }
+#endif // Motif
+

     AdjustScrollbars();
     AdjustScrollbars();

-   
-   if (do_refresh && !noRefresh) Refresh();
-   
+
+    if (do_refresh && !noRefresh)
+        m_targetWindow->Refresh();
+

 #ifdef __WXMSW__
 #ifdef __WXMSW__

-    UpdateWindow ((HWND) GetHWND());
+    // GRG: if this turns out to be really necessary, we could
+    //   at least move it to the above if { ... } so that it is
+    //   only done if noRefresh = FALSE (the default). OTOH, if
+    //   this doesn't break anything, which seems to be the
+    //   case, we could just leave it out.
+
+    // Necessary?
+    // UpdateWindow ((HWND) m_targetWindow->GetHWND());

 #endif
 #endif

+#ifdef __WXMAC__
+    m_targetWindow->MacUpdateImmediately() ;
+#endif
+}
+
+// ----------------------------------------------------------------------------
+// target window handling
+// ----------------------------------------------------------------------------
+
+void wxGenericScrolledWindow::SetTargetWindow( wxWindow *target )
+{
+    wxASSERT_MSG( target, wxT("target window must not be NULL") );
+    m_targetWindow = target;

 }
 
 }
 

-void wxScrolledWindow::OnScroll(wxScrollEvent& event)
+wxWindow *wxGenericScrolledWindow::GetTargetWindow()
+{
+    return m_targetWindow;
+}
+
+// ----------------------------------------------------------------------------
+// scrolling implementation itself
+// ----------------------------------------------------------------------------
+
+void wxGenericScrolledWindow::OnScroll(wxScrollWinEvent& event)

 {
     int orient = event.GetOrientation();
 
     int nScrollInc = CalcScrollInc(event);
     if (nScrollInc == 0) return;
 
 {
     int orient = event.GetOrientation();
 
     int nScrollInc = CalcScrollInc(event);
     if (nScrollInc == 0) return;
 

-    // TODO: should we store the scroll position here as well as in wxWindow?

     if (orient == wxHORIZONTAL)
     {
         int newPos = m_xScrollPosition + nScrollInc;
     if (orient == wxHORIZONTAL)
     {
         int newPos = m_xScrollPosition + nScrollInc;


@@ -133,19 +261,6 @@ void wxScrolledWindow::OnScroll(wxScrollEvent& event)
         SetScrollPos(wxVERTICAL, newPos, TRUE );
     }
 
         SetScrollPos(wxVERTICAL, newPos, TRUE );
     }
 

-/*
-  // TODO We need to multiply the ScrollWindow amount by the scaling
-  // factor, but how do we know what this is in wxWin 2.0???
-  float scaleX = 1.0;
-  float scaleY = 1.0;
-
-  if ( this->IsKindOf(CLASSINFO(wxCanvas)) )
-  {
-    wxDC* dc = ((wxCanvas *)this)->GetDC();
-    dc->GetUserScale(&scaleX, &scaleY);
-  }
-*/
-

     if (orient == wxHORIZONTAL)
     {
         m_xScrollPosition += nScrollInc;
     if (orient == wxHORIZONTAL)
     {
         m_xScrollPosition += nScrollInc;


@@ -154,221 +269,225 @@ void wxScrolledWindow::OnScroll(wxScrollEvent& event)
     {
         m_yScrollPosition += nScrollInc;
     }
     {
         m_yScrollPosition += nScrollInc;
     }

-  
+

     if (orient == wxHORIZONTAL)
     {
        if (m_xScrollingEnabled)
     if (orient == wxHORIZONTAL)
     {
        if (m_xScrollingEnabled)

-            ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
+            m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);

        else
        else

-            Refresh();
+            m_targetWindow->Refresh();

     }
     else
     {
         if (m_yScrollingEnabled)
     }
     else
     {
         if (m_yScrollingEnabled)

-            ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
+            m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);

         else
         else

-            Refresh();
-  }
+            m_targetWindow->Refresh();
+    }
+#ifdef __WXMAC__
+    m_targetWindow->MacUpdateImmediately() ;
+#endif

 }
 
 }
 

-int wxScrolledWindow::CalcScrollInc(wxScrollEvent& event)
+int wxGenericScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)

 {
 {

-  int pos = event.GetPosition();
-  int orient = event.GetOrientation();
+    int pos = event.GetPosition();
+    int orient = event.GetOrientation();

 
 

-  int nScrollInc = 0;
-  switch (event.GetEventType())
-  {
-    case wxEVT_SCROLL_TOP:
+    int nScrollInc = 0;
+    if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)

     {
     {

-      if (orient == wxHORIZONTAL)
-        nScrollInc = - m_xScrollPosition;
-      else
-        nScrollInc = - m_yScrollPosition;
-      break;
-    }
-    case wxEVT_SCROLL_BOTTOM:
+            if (orient == wxHORIZONTAL)
+                nScrollInc = - m_xScrollPosition;
+            else
+                nScrollInc = - m_yScrollPosition;
+    } else
+    if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)

     {
     {

-      if (orient == wxHORIZONTAL)
-        nScrollInc = m_xScrollLines - m_xScrollPosition;
-      else
-        nScrollInc = m_yScrollLines - m_yScrollPosition;
-      break;
-    }
-    case wxEVT_SCROLL_LINEUP:
+            if (orient == wxHORIZONTAL)
+                nScrollInc = m_xScrollLines - m_xScrollPosition;
+            else
+                nScrollInc = m_yScrollLines - m_yScrollPosition;
+    } else
+    if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)

     {
     {

-      nScrollInc = -1;
-      break;
-    }
-    case wxEVT_SCROLL_LINEDOWN:
+            nScrollInc = -1;
+    } else
+    if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)

     {
     {

-      nScrollInc = 1;
-      break;
-    }
-    case wxEVT_SCROLL_PAGEUP:
+            nScrollInc = 1;
+    } else
+    if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)

     {
     {

-      if (orient == wxHORIZONTAL)
-        nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
-      else
-        nScrollInc = -GetScrollPageSize(wxVERTICAL);
-      break;
-    }
-    case wxEVT_SCROLL_PAGEDOWN:
+            if (orient == wxHORIZONTAL)
+                nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
+            else
+                nScrollInc = -GetScrollPageSize(wxVERTICAL);
+    } else
+    if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)

     {
     {

-      if (orient == wxHORIZONTAL)
-        nScrollInc = GetScrollPageSize(wxHORIZONTAL);
-      else
-        nScrollInc = GetScrollPageSize(wxVERTICAL);
-      break;
-    }
-    case wxEVT_SCROLL_THUMBTRACK:
+            if (orient == wxHORIZONTAL)
+                nScrollInc = GetScrollPageSize(wxHORIZONTAL);
+            else
+                nScrollInc = GetScrollPageSize(wxVERTICAL);
+    } else
+    if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
+        (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))

     {
     {

-      if (orient == wxHORIZONTAL)
-        nScrollInc = pos - m_xScrollPosition;
-      else
-        nScrollInc = pos - m_yScrollPosition;
-      break;
+            if (orient == wxHORIZONTAL)
+                nScrollInc = pos - m_xScrollPosition;
+            else
+                nScrollInc = pos - m_yScrollPosition;

     }
     }

-    default:
+
+    if (orient == wxHORIZONTAL)

     {
     {

-      break;
-    }
-  }
-  if (orient == wxHORIZONTAL)
-  {
-    if (m_xScrollPixelsPerLine > 0) {
-      int w, h;
-      GetClientSize(&w, &h);
-
-      int nMaxWidth = m_xScrollLines*m_xScrollPixelsPerLine;
-      int noPositions = (int) ( ((nMaxWidth - w)/(float)m_xScrollPixelsPerLine) + 0.5 );
-      if (noPositions < 0)
-       noPositions = 0;
-
-      if ( (m_xScrollPosition + nScrollInc) < 0 )
-       nScrollInc = -m_xScrollPosition; // As -ve as we can go
-      else if ( (m_xScrollPosition + nScrollInc) > noPositions )
-       nScrollInc = noPositions - m_xScrollPosition; // As +ve as we can go
+        if (m_xScrollPixelsPerLine > 0)
+        {
+            int w, h;
+            m_targetWindow->GetClientSize(&w, &h);
+
+            int nMaxWidth = m_xScrollLines*m_xScrollPixelsPerLine;
+            int noPositions = (int) ( ((nMaxWidth - w)/(double)m_xScrollPixelsPerLine) + 0.5 );
+            if (noPositions < 0)
+                noPositions = 0;
+
+            if ( (m_xScrollPosition + nScrollInc) < 0 )
+                nScrollInc = -m_xScrollPosition; // As -ve as we can go
+            else if ( (m_xScrollPosition + nScrollInc) > noPositions )
+                nScrollInc = noPositions - m_xScrollPosition; // As +ve as we can go
+        }
+        else
+            m_targetWindow->Refresh();

     }
     else
     }
     else

-      Refresh();
-  }
-  else
-  {
-    if (m_yScrollPixelsPerLine > 0) {
-      int w, h;
-      GetClientSize(&w, &h);
-      
-      int nMaxHeight = m_yScrollLines*m_yScrollPixelsPerLine;
-      int noPositions = (int) ( ((nMaxHeight - h)/(float)m_yScrollPixelsPerLine) + 0.5 );
-      if (noPositions < 0)
-       noPositions = 0;
-      
-      if ( (m_yScrollPosition + nScrollInc) < 0 )
-       nScrollInc = -m_yScrollPosition; // As -ve as we can go
-      else if ( (m_yScrollPosition + nScrollInc) > noPositions )
-       nScrollInc = noPositions - m_yScrollPosition; // As +ve as we can go
+    {
+        if (m_yScrollPixelsPerLine > 0)
+        {
+            int w, h;
+            m_targetWindow->GetClientSize(&w, &h);
+
+            int nMaxHeight = m_yScrollLines*m_yScrollPixelsPerLine;
+            int noPositions = (int) ( ((nMaxHeight - h)/(double)m_yScrollPixelsPerLine) + 0.5 );
+            if (noPositions < 0)
+                noPositions = 0;
+
+            if ( (m_yScrollPosition + nScrollInc) < 0 )
+                nScrollInc = -m_yScrollPosition; // As -ve as we can go
+            else if ( (m_yScrollPosition + nScrollInc) > noPositions )
+                nScrollInc = noPositions - m_yScrollPosition; // As +ve as we can go
+        }
+        else
+            m_targetWindow->Refresh();

     }
     }

-    else
-      Refresh();
-  }

 
 

-  return nScrollInc;
+    return nScrollInc;

 }
 
 // Adjust the scrollbars - new version.
 }
 
 // Adjust the scrollbars - new version.

-void wxScrolledWindow::AdjustScrollbars(void)
+void wxGenericScrolledWindow::AdjustScrollbars()

 {
     int w, h;
 {
     int w, h;

-    GetClientSize(&w, &h);
+    m_targetWindow->GetClientSize(&w, &h);
+
+    int oldXScroll = m_xScrollPosition;
+    int oldYScroll = m_yScrollPosition;

 
     if (m_xScrollLines > 0)
     {
 
     if (m_xScrollLines > 0)
     {

-       // Calculate page size i.e. number of scroll units you get on the
-       // current client window
-        int noPagePositions = (int) ( (w/(float)m_xScrollPixelsPerLine) + 0.5 );
+        // Calculate page size i.e. number of scroll units you get on the
+        // current client window
+        int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );

         if (noPagePositions < 1) noPagePositions = 1;
 
         // Correct position if greater than extent of canvas minus
         if (noPagePositions < 1) noPagePositions = 1;
 
         // Correct position if greater than extent of canvas minus

-       // the visible portion of it or if below zero
-       m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition);
+        // the visible portion of it or if below zero
+        m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition);

         m_xScrollPosition = wxMax( 0, m_xScrollPosition );
 
         SetScrollbar(wxHORIZONTAL, m_xScrollPosition, noPagePositions, m_xScrollLines);
         m_xScrollPosition = wxMax( 0, m_xScrollPosition );
 
         SetScrollbar(wxHORIZONTAL, m_xScrollPosition, noPagePositions, m_xScrollLines);

-//      SetScrollPageSize(wxHORIZONTAL, noPagePositions);
+        // The amount by which we scroll when paging
+        SetScrollPageSize(wxHORIZONTAL, noPagePositions);

     }
     else
     }
     else

-    { 
+    {

         m_xScrollPosition = 0;
         m_xScrollPosition = 0;

-        SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);  
+        SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);

     }
     }

-    
+

     if (m_yScrollLines > 0)
     {
     if (m_yScrollLines > 0)
     {

-       // Calculate page size i.e. number of scroll units you get on the
-       // current client window
-        int noPagePositions = (int) ( (h/(float)m_yScrollPixelsPerLine) + 0.5 );
+        // Calculate page size i.e. number of scroll units you get on the
+        // current client window
+        int noPagePositions = (int) ( (h/(double)m_yScrollPixelsPerLine) + 0.5 );

         if (noPagePositions < 1) noPagePositions = 1;
 
         // Correct position if greater than extent of canvas minus
         if (noPagePositions < 1) noPagePositions = 1;
 
         // Correct position if greater than extent of canvas minus

-       // the visible portion of it or if below zero
+        // the visible portion of it or if below zero

         m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
         m_yScrollPosition = wxMax( 0, m_yScrollPosition );
 
         SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, m_yScrollLines);
         m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
         m_yScrollPosition = wxMax( 0, m_yScrollPosition );
 
         SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, m_yScrollLines);

-//      SetScrollPageSize(wxVERTICAL, noPagePositions);
+        // The amount by which we scroll when paging
+        SetScrollPageSize(wxVERTICAL, noPagePositions);

     }
     else
     {
         m_yScrollPosition = 0;
     }
     else
     {
         m_yScrollPosition = 0;

-        SetScrollbar (wxVERTICAL, 0, 0, 0, FALSE); 
+        SetScrollbar (wxVERTICAL, 0, 0, 0, FALSE);

     }
     }

-}
-
-// Default OnSize resets scrollbars, if any
-void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
-{
-#if wxUSE_CONSTRAINTS
-    if (GetAutoLayout()) Layout();
-#endif

 
 

-    AdjustScrollbars();
-}
-
-// This calls OnDraw, having adjusted the origin according to the current
-// scroll position
-void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
-{
-    wxPaintDC dc(this);
-    PrepareDC(dc);
+    if (oldXScroll != m_xScrollPosition)
+    {
+       if (m_xScrollingEnabled)
+            m_targetWindow->ScrollWindow( m_xScrollPixelsPerLine * (oldXScroll-m_xScrollPosition), 0, (const wxRect *) NULL );
+       else
+            m_targetWindow->Refresh();
+    }

 
 

-    OnDraw(dc);
+    if (oldYScroll != m_yScrollPosition)
+    {
+        if (m_yScrollingEnabled)
+            m_targetWindow->ScrollWindow( 0, m_yScrollPixelsPerLine * (oldYScroll-m_yScrollPosition), (const wxRect *) NULL );
+        else
+            m_targetWindow->Refresh();
+    }

 }
 
 }
 

-// Override this function if you don't want to have wxScrolledWindow
+// Override this function if you don't want to have wxGenericScrolledWindow

 // automatically change the origin according to the scroll position.
 // automatically change the origin according to the scroll position.

-void wxScrolledWindow::PrepareDC(wxDC& dc)
+void wxGenericScrolledWindow::PrepareDC(wxDC& dc)

 {
 {

-    dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine, 
+    dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,

                         -m_yScrollPosition * m_yScrollPixelsPerLine );
     dc.SetUserScale( m_scaleX, m_scaleY );
 }
 
 #if WXWIN_COMPATIBILITY
                         -m_yScrollPosition * m_yScrollPixelsPerLine );
     dc.SetUserScale( m_scaleX, m_scaleY );
 }
 
 #if WXWIN_COMPATIBILITY

-void wxScrolledWindow::GetScrollUnitsPerPage (int *x_page, int *y_page) const
+void wxGenericScrolledWindow::GetScrollUnitsPerPage (int *x_page, int *y_page) const

 {
       *x_page = GetScrollPageSize(wxHORIZONTAL);
       *y_page = GetScrollPageSize(wxVERTICAL);
 }
 {
       *x_page = GetScrollPageSize(wxHORIZONTAL);
       *y_page = GetScrollPageSize(wxVERTICAL);
 }

-#endif

 
 

-void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
+void wxGenericScrolledWindow::CalcUnscrolledPosition(int x, int y, float *xx, float *yy) const

 {
 {

-      *x_unit = m_xScrollPixelsPerLine;
-      *y_unit = m_yScrollPixelsPerLine;
+    if ( xx )
+        *xx = (float)(x + m_xScrollPosition * m_xScrollPixelsPerLine);
+    if ( yy )
+        *yy = (float)(y + m_yScrollPosition * m_yScrollPixelsPerLine);

 }
 }

+#endif // WXWIN_COMPATIBILITY

 
 

-int wxScrolledWindow::GetScrollPageSize(int orient) const
+void wxGenericScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
+{
+    if ( x_unit )
+        *x_unit = m_xScrollPixelsPerLine;
+    if ( y_unit )
+        *y_unit = m_yScrollPixelsPerLine;
+}
+
+int wxGenericScrolledWindow::GetScrollPageSize(int orient) const

 {
     if ( orient == wxHORIZONTAL )
         return m_xScrollLinesPerPage;
 {
     if ( orient == wxHORIZONTAL )
         return m_xScrollLinesPerPage;


@@ -376,7 +495,7 @@ int wxScrolledWindow::GetScrollPageSize(int orient) const
         return m_yScrollLinesPerPage;
 }
 
         return m_yScrollLinesPerPage;
 }
 

-void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
+void wxGenericScrolledWindow::SetScrollPageSize(int orient, int pageSize)

 {
     if ( orient == wxHORIZONTAL )
         m_xScrollLinesPerPage = pageSize;
 {
     if ( orient == wxHORIZONTAL )
         m_xScrollLinesPerPage = pageSize;


@@ -387,83 +506,223 @@ void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
 /*
  * Scroll to given position (scroll position, not pixel position)
  */
 /*
  * Scroll to given position (scroll position, not pixel position)
  */

-void wxScrolledWindow::Scroll( int x_pos, int y_pos )
+void wxGenericScrolledWindow::Scroll( int x_pos, int y_pos )

 {
 {

-    if (((x_pos == -1) || (x_pos == m_xScrollPosition)) && 
+    if (!m_targetWindow)
+        return;
+
+    if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&

         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;

-  
+

     int w, h;
     int w, h;

-    GetClientSize(&w, &h);
+    m_targetWindow->GetClientSize(&w, &h);

 
 

-    if (x_pos != -1)
+    if ((x_pos != -1) && (m_xScrollPixelsPerLine))

     {
     {

+        int old_x = m_xScrollPosition;

         m_xScrollPosition = x_pos;
         m_xScrollPosition = x_pos;

-    
-       // Calculate page size i.e. number of scroll units you get on the
-       // current client window
-        int noPagePositions = (int) ( (w/(float)m_xScrollPixelsPerLine) + 0.5 );
+
+        // Calculate page size i.e. number of scroll units you get on the
+        // current client window
+        int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );

         if (noPagePositions < 1) noPagePositions = 1;
 
         // Correct position if greater than extent of canvas minus
         if (noPagePositions < 1) noPagePositions = 1;
 
         // Correct position if greater than extent of canvas minus

-       // the visible portion of it or if below zero
+        // the visible portion of it or if below zero

         m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition );
         m_xScrollPosition = wxMax( 0, m_xScrollPosition );
         m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition );
         m_xScrollPosition = wxMax( 0, m_xScrollPosition );

-      
-        SetScrollPos( wxHORIZONTAL, m_xScrollPosition, TRUE );
+
+        if (old_x != m_xScrollPosition) {
+            m_targetWindow->SetScrollPos( wxHORIZONTAL, m_xScrollPosition, TRUE );
+            m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
+        }

     }
     }

-    if (y_pos != -1)
+    if ((y_pos != -1) && (m_yScrollPixelsPerLine))

     {
     {

+        int old_y = m_yScrollPosition;

         m_yScrollPosition = y_pos;
         m_yScrollPosition = y_pos;

-       
-       // Calculate page size i.e. number of scroll units you get on the
-       // current client window
-        int noPagePositions = (int) ( (h/(float)m_yScrollPixelsPerLine) + 0.5 );
+
+        // Calculate page size i.e. number of scroll units you get on the
+        // current client window
+        int noPagePositions = (int) ( (h/(double)m_yScrollPixelsPerLine) + 0.5 );

         if (noPagePositions < 1) noPagePositions = 1;
 
         // Correct position if greater than extent of canvas minus
         if (noPagePositions < 1) noPagePositions = 1;
 
         // Correct position if greater than extent of canvas minus

-       // the visible portion of it or if below zero
+        // the visible portion of it or if below zero

         m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
         m_yScrollPosition = wxMax( 0, m_yScrollPosition );
         m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
         m_yScrollPosition = wxMax( 0, m_yScrollPosition );

-       
-        SetScrollPos( wxVERTICAL, m_yScrollPosition, TRUE );
+
+        if (old_y != m_yScrollPosition) {
+            m_targetWindow->SetScrollPos( wxVERTICAL, m_yScrollPosition, TRUE );
+            m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
+        }

     }
     }

-    
-    Refresh();
-    
-#ifdef __WXMSW__
-    ::UpdateWindow ((HWND) GetHWND());
+
+#ifdef __WXMAC__
+    m_targetWindow->MacUpdateImmediately();

 #endif
 }
 
 #endif
 }
 

-void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
+void wxGenericScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)

 {
     m_xScrollingEnabled = x_scroll;
     m_yScrollingEnabled = y_scroll;
 }
 
 {
     m_xScrollingEnabled = x_scroll;
     m_yScrollingEnabled = y_scroll;
 }
 

-void wxScrolledWindow::GetVirtualSize (int *x, int *y) const
+void wxGenericScrolledWindow::GetVirtualSize (int *x, int *y) const

 {
 {

-    *x = m_xScrollPixelsPerLine * m_xScrollLines;
-    *y = m_yScrollPixelsPerLine * m_yScrollLines;
+    if ( x )
+        *x = m_xScrollPixelsPerLine * m_xScrollLines;
+    if ( y )
+        *y = m_yScrollPixelsPerLine * m_yScrollLines;

 }
 
 // Where the current view starts from
 }
 
 // Where the current view starts from

-void wxScrolledWindow::ViewStart (int *x, int *y) const
+void wxGenericScrolledWindow::GetViewStart (int *x, int *y) const
+{
+    if ( x )
+        *x = m_xScrollPosition;
+    if ( y )
+        *y = m_yScrollPosition;
+}
+
+void wxGenericScrolledWindow::CalcScrolledPosition(int x, int y, int *xx, int *yy) const
+{
+    if ( xx )
+        *xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;
+    if ( yy )
+        *yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
+}
+
+void wxGenericScrolledWindow::CalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
+{
+    if ( xx )
+        *xx = x + m_xScrollPosition * m_xScrollPixelsPerLine;
+    if ( yy )
+        *yy = y + m_yScrollPosition * m_yScrollPixelsPerLine;
+}
+
+// ----------------------------------------------------------------------------
+// event handlers
+// ----------------------------------------------------------------------------
+
+// Default OnSize resets scrollbars, if any
+void wxGenericScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))

 {
 {

-    *x = m_xScrollPosition;
-    *y = m_yScrollPosition;
+#if wxUSE_CONSTRAINTS
+    if (GetAutoLayout())
+        Layout();
+#endif
+
+    AdjustScrollbars();

 }
 
 }
 

-void wxScrolledWindow::CalcScrolledPosition(int x, int y, int *xx, int *yy) const
+// This calls OnDraw, having adjusted the origin according to the current
+// scroll position
+void wxGenericScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))

 {
 {

-    *xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;
-    *yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
+    wxPaintDC dc(this);
+    PrepareDC(dc);
+
+    OnDraw(dc);

 }
 
 }
 

-void wxScrolledWindow::CalcUnscrolledPosition(int x, int y, float *xx, float *yy) const
+// kbd handling: notice that we use OnChar() and not OnKeyDown() for
+// compatibility here - if we used OnKeyDown(), the programs which process
+// arrows themselves in their OnChar() would never get the message and like
+// this they always have the priority
+void wxGenericScrolledWindow::OnChar(wxKeyEvent& event)

 {
 {

-    *xx = (float)(x + m_xScrollPosition * m_xScrollPixelsPerLine);
-    *yy = (float)(y + m_yScrollPosition * m_yScrollPixelsPerLine);
+    int stx, sty,       // view origin
+        szx, szy,       // view size (total)
+        clix, cliy;     // view size (on screen)
+
+    ViewStart(&stx, &sty);
+    GetClientSize(&clix, &cliy);
+    GetVirtualSize(&szx, &szy);
+
+    if( m_xScrollPixelsPerLine )
+    {
+        clix /= m_xScrollPixelsPerLine;
+        szx /= m_xScrollPixelsPerLine;
+    }
+    else
+    {
+        clix = 0;
+        szx = -1;
+    }
+    if( m_yScrollPixelsPerLine )
+    {
+        cliy /= m_yScrollPixelsPerLine;
+        szy /= m_yScrollPixelsPerLine;
+    }
+    else
+    {
+        cliy = 0;
+        szy = -1;
+    }
+
+    int dsty;
+    switch ( event.KeyCode() )
+    {
+        case WXK_PAGEUP:
+        case WXK_PRIOR:
+            dsty = sty - (5 * cliy / 6);
+            Scroll(-1, (dsty == -1) ? 0 : dsty);
+            break;
+
+        case WXK_PAGEDOWN:
+        case WXK_NEXT:
+            Scroll(-1, sty + (5 * cliy / 6));
+            break;
+
+        case WXK_HOME:
+            Scroll(0, event.ControlDown() ? 0 : -1);
+            break;
+
+        case WXK_END:
+            Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
+            break;
+
+        case WXK_UP:
+            Scroll(-1, sty - 1);
+            break;
+
+        case WXK_DOWN:
+            Scroll(-1, sty + 1);
+            break;
+
+        case WXK_LEFT:
+            Scroll(stx - 1, -1);
+            break;
+
+        case WXK_RIGHT:
+            Scroll(stx + 1, -1);
+            break;
+
+        default:
+            // not for us
+            event.Skip();
+    }

 }
 
 
 }
 
 

+void wxGenericScrolledWindow::OnMouseWheel(wxMouseEvent& event)
+{
+    int lines;
+    int vsx, vsy;
+
+    m_wheelRotation += event.GetWheelRotation();
+    lines = m_wheelRotation / event.GetWheelDelta();
+    m_wheelRotation -= lines * event.GetWheelDelta();
+
+    if (lines != 0) {
+        lines *= event.GetLinesPerAction();
+        GetViewStart(&vsx, &vsy);
+        Scroll(-1, vsy - lines);
+    }
+}
+
+
+
+