Put wxContextHelp into cshelp.h/cpp, added wxContextHelpButton

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

diff --git a/src/generic/scrolwin.cpp b/src/generic/scrolwin.cpp
index f82d3fa0d4ecf62a302df376032a285a4362a88e..18939cb0b894c2e253ab51c9496ae6cb2bb848ee 100644 (file)
--- a/src/generic/scrolwin.cpp
+++ b/src/generic/scrolwin.cpp
@@ -1,355 +1,472 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        scrolwin.cpp
+// Name:        generic/scrolwin.cpp

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

-#ifdef __WINDOWS__
-#include "windows.h"
+#include "wx/generic/scrolwin.h"
+#include "wx/panel.h"
+
+#ifdef __WXMSW__
+    #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"
+// ----------------------------------------------------------------------------
+// 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(wxScrolledWindow, wxPanel)
+    EVT_SCROLLWIN(wxScrolledWindow::OnScroll)
+    EVT_SIZE(wxScrolledWindow::OnSize)
+    EVT_PAINT(wxScrolledWindow::OnPaint)
+    EVT_CHAR(wxScrolledWindow::OnChar)

 END_EVENT_TABLE()
 
 END_EVENT_TABLE()
 

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

 
 

-wxScrolledWindow::wxScrolledWindow(void)
+wxScrolledWindow::wxScrolledWindow()

 {
 {

-  m_xScrollPixelsPerLine = 0;
-  m_yScrollPixelsPerLine = 0;
-  m_xScrollingEnabled = TRUE;
-  m_yScrollingEnabled = TRUE;
-  m_xScrollPosition = 0;
-  m_yScrollPosition = 0;
-  m_xScrollLines = 0;
-  m_yScrollLines = 0;
-  m_xScrollLinesPerPage = 0;
-  m_yScrollLinesPerPage = 0;
+    m_xScrollPixelsPerLine = 0;
+    m_yScrollPixelsPerLine = 0;
+    m_xScrollingEnabled = TRUE;
+    m_yScrollingEnabled = TRUE;
+    m_xScrollPosition = 0;
+    m_yScrollPosition = 0;
+    m_xScrollLines = 0;
+    m_yScrollLines = 0;
+    m_xScrollLinesPerPage = 0;
+    m_yScrollLinesPerPage = 0;
+    m_scaleX = 1.0;
+    m_scaleY = 1.0;
+    m_targetWindow = (wxWindow*) NULL;
+}
+
+bool wxScrolledWindow::Create(wxWindow *parent,
+                              wxWindowID id,
+                              const wxPoint& pos,
+                              const wxSize& size,
+                              long style,
+                              const wxString& name)
+{
+    m_xScrollPixelsPerLine = 0;
+    m_yScrollPixelsPerLine = 0;
+    m_xScrollingEnabled = TRUE;
+    m_yScrollingEnabled = TRUE;
+    m_xScrollPosition = 0;
+    m_yScrollPosition = 0;
+    m_xScrollLines = 0;
+    m_yScrollLines = 0;
+    m_xScrollLinesPerPage = 0;
+    m_yScrollLinesPerPage = 0;
+    m_scaleX = 1.0;
+    m_scaleY = 1.0;
+
+    m_targetWindow = this;
+
+    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;

 }
 
 }
 

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

 {
 {

-  m_xScrollPixelsPerLine = 0;
-  m_yScrollPixelsPerLine = 0;
-  m_xScrollingEnabled = TRUE;
-  m_yScrollingEnabled = TRUE;
-  m_xScrollPosition = 0;
-  m_yScrollPosition = 0;
-  m_xScrollLines = 0;
-  m_yScrollLines = 0;
-  m_xScrollLinesPerPage = 0;
-  m_yScrollLinesPerPage = 0;
-
-  return wxWindow::Create(parent, id, pos, size, style, name);

 }
 
 }
 

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

 {
 {

-  bool do_refresh =
-     (
+    int xpos, ypos;
+
+    CalcUnscrolledPosition(xPos, yPos, &xpos, &ypos);
+    bool do_refresh =
+    (

       (noUnitsX != 0 && m_xScrollLines == 0) ||
       (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)
-     );
-      
-      m_xScrollPixelsPerLine = pixelsPerUnitX;
-      m_yScrollPixelsPerLine = pixelsPerUnitY;
-      m_xScrollLines = noUnitsX;
-      m_yScrollLines = noUnitsY;
-
-   AdjustScrollbars();
-   
-   if (do_refresh && !noRefresh) Refresh();
-   
-#ifdef __WINDOWS__
-    UpdateWindow ((HWND) GetHWND());
+      (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;
+
+#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();
+
+    if (do_refresh && !noRefresh)
+        m_targetWindow->Refresh();
+
+#ifdef __WXMSW__
+    // 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
+#ifdef __WXMAC__
+    m_targetWindow->MacUpdateImmediately() ;

 #endif
 }
 
 #endif
 }
 

-void wxScrolledWindow::OnScroll(wxScrollEvent& event)
-{
-  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;
-    SetScrollPos(wxHORIZONTAL, newPos, TRUE );
-  }
-  else
-  {
-    int newPos = m_yScrollPosition + nScrollInc;
-    SetScrollPos(wxVERTICAL, newPos, TRUE );
-  }
+// ----------------------------------------------------------------------------
+// target window handling
+// ----------------------------------------------------------------------------

 
 

-/*
-  // 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;
-  }
-  else
-  {
-    m_yScrollPosition += nScrollInc;
-  }
-  
-  if (orient == wxHORIZONTAL)
-  {
-    if (m_xScrollingEnabled)
-      ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, NULL);
-    else
-      Refresh();
-  }
-  else
-  {
-    if (m_yScrollingEnabled)
-      ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, NULL);
-    else
-      Refresh();
-  }
+void wxScrolledWindow::SetTargetWindow( wxWindow *target )
+{
+    wxASSERT_MSG( target, wxT("target window must not be NULL") );
+    m_targetWindow = target;
+}

 
 

+wxWindow *wxScrolledWindow::GetTargetWindow()
+{
+    return m_targetWindow;

 }
 
 }
 

-int wxScrolledWindow::CalcScrollInc(wxScrollEvent& event)
+// ----------------------------------------------------------------------------
+// scrolling implementation itself
+// ----------------------------------------------------------------------------
+
+void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)

 {
 {

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

 
 

-  int nScrollInc = 0;
-  switch (event.GetEventType())
-  {
-    case wxEVENT_TYPE_SCROLL_TOP:
+    int nScrollInc = CalcScrollInc(event);
+    if (nScrollInc == 0) return;
+
+    if (orient == wxHORIZONTAL)
+    {
+        int newPos = m_xScrollPosition + nScrollInc;
+        SetScrollPos(wxHORIZONTAL, newPos, TRUE );
+    }
+    else

     {
     {

-      if (orient == wxHORIZONTAL)
-        nScrollInc = - m_xScrollPosition;
-      else
-        nScrollInc = - m_yScrollPosition;
-      break;
+        int newPos = m_yScrollPosition + nScrollInc;
+        SetScrollPos(wxVERTICAL, newPos, TRUE );

     }
     }

-    case wxEVENT_TYPE_SCROLL_BOTTOM:
+
+    if (orient == wxHORIZONTAL)

     {
     {

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

     }
     }

-    case wxEVENT_TYPE_SCROLL_LINEUP:
+    else

     {
     {

-      nScrollInc = -1;
-      break;
+        m_yScrollPosition += nScrollInc;

     }
     }

-    case wxEVENT_TYPE_SCROLL_LINEDOWN:
+
+    if (orient == wxHORIZONTAL)

     {
     {

-      nScrollInc = 1;
-      break;
+       if (m_xScrollingEnabled)
+            m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
+       else
+            m_targetWindow->Refresh();

     }
     }

-    case wxEVENT_TYPE_SCROLL_PAGEUP:
+    else

     {
     {

-      if (orient == wxHORIZONTAL)
-        nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
-      else
-        nScrollInc = -GetScrollPageSize(wxVERTICAL);
-      break;
+        if (m_yScrollingEnabled)
+            m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
+        else
+            m_targetWindow->Refresh();

     }
     }

-    case wxEVENT_TYPE_SCROLL_PAGEDOWN:
+#ifdef __WXMAC__
+    m_targetWindow->MacUpdateImmediately() ;
+#endif
+}
+
+int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
+{
+    int pos = event.GetPosition();
+    int orient = event.GetOrientation();
+
+    int nScrollInc = 0;
+    switch (event.GetEventType())

     {
     {

-      if (orient == wxHORIZONTAL)
-        nScrollInc = GetScrollPageSize(wxHORIZONTAL);
-      else
-        nScrollInc = GetScrollPageSize(wxVERTICAL);
-      break;
+        case wxEVT_SCROLLWIN_TOP:
+        {
+            if (orient == wxHORIZONTAL)
+                nScrollInc = - m_xScrollPosition;
+            else
+                nScrollInc = - m_yScrollPosition;
+            break;
+        }
+        case wxEVT_SCROLLWIN_BOTTOM:
+        {
+            if (orient == wxHORIZONTAL)
+                nScrollInc = m_xScrollLines - m_xScrollPosition;
+            else
+                nScrollInc = m_yScrollLines - m_yScrollPosition;
+            break;
+        }
+        case wxEVT_SCROLLWIN_LINEUP:
+        {
+            nScrollInc = -1;
+            break;
+        }
+        case wxEVT_SCROLLWIN_LINEDOWN:
+        {
+            nScrollInc = 1;
+            break;
+        }
+        case wxEVT_SCROLLWIN_PAGEUP:
+        {
+            if (orient == wxHORIZONTAL)
+                nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
+            else
+                nScrollInc = -GetScrollPageSize(wxVERTICAL);
+            break;
+        }
+        case wxEVT_SCROLLWIN_PAGEDOWN:
+        {
+            if (orient == wxHORIZONTAL)
+                nScrollInc = GetScrollPageSize(wxHORIZONTAL);
+            else
+                nScrollInc = GetScrollPageSize(wxVERTICAL);
+            break;
+        }
+        case wxEVT_SCROLLWIN_THUMBTRACK:
+        case wxEVT_SCROLLWIN_THUMBRELEASE:
+        {
+            if (orient == wxHORIZONTAL)
+                nScrollInc = pos - m_xScrollPosition;
+            else
+                nScrollInc = pos - m_yScrollPosition;
+            break;
+        }
+        default:
+        {
+            break;
+        }

     }
     }

-    case wxEVENT_TYPE_SCROLL_THUMBTRACK:
+
+    if (orient == wxHORIZONTAL)

     {
     {

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

     }
     }

-    default:
+    else

     {
     {

-      break;
+        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();

     }
     }

-  }
-  if (orient == wxHORIZONTAL)
-  {
-        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
-
-        return nScrollInc;
-  }
-  else
-  {
-        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
-
-        return nScrollInc;
-  }
+
+    return nScrollInc;

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

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

 {
 {

-  int w, h;
-  GetClientSize(&w, &h);
-
-  // Recalculate scroll bar range and position
-  if (m_xScrollLines > 0)
-  {
-    int nMaxWidth = m_xScrollLines*m_xScrollPixelsPerLine;
-    int newRange = (int) ( ((nMaxWidth)/(float)m_xScrollPixelsPerLine) + 0.5 );
-    if (newRange < 0)
-      newRange = 0;
-
-    m_xScrollPosition = wxMin(newRange, m_xScrollPosition);
-
-       // 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 );
-    if (noPagePositions < 1)
-      noPagePositions = 1;
-
-    SetScrollbar(wxHORIZONTAL, m_xScrollPosition, noPagePositions, newRange);
-    SetScrollPageSize(wxHORIZONTAL, noPagePositions);
-  }
-  // Robert Roebling
-  else
-  { 
-    m_xScrollPosition = 0;
-    SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);  
-  }
-    
-  if (m_yScrollLines > 0)
-  {
-    int nMaxHeight = m_yScrollLines*m_yScrollPixelsPerLine;
-    int newRange = (int) ( ((nMaxHeight)/(float)m_yScrollPixelsPerLine) + 0.5 );
-    if (newRange < 0)
-      newRange = 0;
-
-    m_yScrollPosition = wxMin(newRange, m_yScrollPosition);
-
-       // 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 );
-    if (noPagePositions < 1)
-      noPagePositions = 1;
-
-    SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, newRange);
-    SetScrollPageSize(wxVERTICAL, noPagePositions);
-  }
-  else
-  {
-    m_yScrollPosition = 0;
-    SetScrollbar (wxVERTICAL, 0, 0, 0, FALSE);  // Robert Roebling
-  }
-  
-}
+    int w, h;
+    m_targetWindow->GetClientSize(&w, &h);

 
 

-// Default OnSize resets scrollbars, if any
-void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
-{
-#if USE_CONSTRAINTS
-  if (GetAutoLayout())
-    Layout();
-#endif
+    int oldXScroll = m_xScrollPosition;
+    int oldYScroll = m_yScrollPosition;

 
 

-  AdjustScrollbars();
-}
+    if (m_xScrollLines > 0)
+    {
+        // 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
+        // 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);
+        // The amount by which we scroll when paging
+        SetScrollPageSize(wxHORIZONTAL, noPagePositions);
+    }
+    else
+    {
+        m_xScrollPosition = 0;
+        SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);
+    }

 
 

-// 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 (m_yScrollLines > 0)
+    {
+        // 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
+        // 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);
+        // The amount by which we scroll when paging
+        SetScrollPageSize(wxVERTICAL, noPagePositions);
+    }
+    else
+    {
+        m_yScrollPosition = 0;
+        SetScrollbar (wxVERTICAL, 0, 0, 0, FALSE);
+    }

 
 

-       OnDraw(dc);
+    if (oldXScroll != m_xScrollPosition)
+    {
+       if (m_xScrollingEnabled)
+            m_targetWindow->ScrollWindow( m_xScrollPixelsPerLine * (oldXScroll-m_xScrollPosition), 0, (const wxRect *) NULL );
+       else
+            m_targetWindow->Refresh();
+    }
+
+    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
 // automatically change the origin according to the scroll position.
 void wxScrolledWindow::PrepareDC(wxDC& dc)
 {
 }
 
 // Override this function if you don't want to have wxScrolledWindow
 // automatically change the origin according to the scroll position.
 void wxScrolledWindow::PrepareDC(wxDC& dc)
 {

-       dc.SetDeviceOrigin(- m_xScrollPosition * m_xScrollPixelsPerLine, - m_yScrollPosition * m_yScrollPixelsPerLine);
+    dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
+                        -m_yScrollPosition * m_yScrollPixelsPerLine );
+    dc.SetUserScale( m_scaleX, m_scaleY );

 }
 
 #if WXWIN_COMPATIBILITY
 }
 
 #if WXWIN_COMPATIBILITY


@@ -358,12 +475,22 @@ void wxScrolledWindow::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::CalcUnscrolledPosition(int x, int y, float *xx, float *yy) const
+{
+    if ( xx )
+        *xx = (float)(x + m_xScrollPosition * m_xScrollPixelsPerLine);
+    if ( yy )
+        *yy = (float)(y + m_yScrollPosition * m_yScrollPixelsPerLine);
+}
+#endif // WXWIN_COMPATIBILITY

 
 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 {
 
 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 {

-      *x_unit = m_xScrollPixelsPerLine;
-      *y_unit = m_yScrollPixelsPerLine;
+    if ( x_unit )
+        *x_unit = m_xScrollPixelsPerLine;
+    if ( y_unit )
+        *y_unit = m_yScrollPixelsPerLine;

 }
 
 int wxScrolledWindow::GetScrollPageSize(int orient) const
 }
 
 int wxScrolledWindow::GetScrollPageSize(int orient) const


@@ -385,58 +512,202 @@ 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 (const int x_pos, const int y_pos)
+void wxScrolledWindow::Scroll( int x_pos, int y_pos )

 {
 {

-  int old_x, old_y;
-  ViewStart (&old_x, &old_y);
-  if (((x_pos == -1) || (x_pos == old_x)) && ((y_pos == -1) || (y_pos == old_y)))
-    return;
+    if (!m_targetWindow)
+        return;
+
+    if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
+        ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;

 
 

-  if (x_pos > -1)
+    int w, h;
+    m_targetWindow->GetClientSize(&w, &h);
+
+    if ((x_pos != -1) && (m_xScrollPixelsPerLine))

     {
     {

-      m_xScrollPosition = x_pos;
-      SetScrollPos (wxHORIZONTAL, x_pos, TRUE);
+        int old_x = m_xScrollPosition;
+        m_xScrollPosition = x_pos;
+
+        // 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
+        // the visible portion of it or if below zero
+        m_xScrollPosition = wxMin( m_xScrollLines-noPagePositions, m_xScrollPosition );
+        m_xScrollPosition = wxMax( 0, m_xScrollPosition );
+
+        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))

     {
     {

-      m_yScrollPosition = y_pos;
-      SetScrollPos (wxVERTICAL, y_pos, TRUE);
+        int old_y = m_yScrollPosition;
+        m_yScrollPosition = y_pos;
+
+        // 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
+        // the visible portion of it or if below zero
+        m_yScrollPosition = wxMin( m_yScrollLines-noPagePositions, m_yScrollPosition );
+        m_yScrollPosition = wxMax( 0, m_yScrollPosition );
+        
+        if (old_y != m_yScrollPosition) {
+            m_targetWindow->SetScrollPos( wxVERTICAL, m_yScrollPosition, TRUE );
+            m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
+        }

     }
     }

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

 #endif
 }
 
 #endif
 }
 

-void wxScrolledWindow::EnableScrolling (const bool x_scroll, const bool y_scroll)
+void wxScrolledWindow::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 wxScrolledWindow::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 wxScrolledWindow::GetViewStart (int *x, int *y) const

 {
 {

-  *x = m_xScrollPosition;
-  *y = m_yScrollPosition;
+    if ( x )
+        *x = m_xScrollPosition;
+    if ( y )
+        *y = m_yScrollPosition;

 }
 
 }
 

-void wxScrolledWindow::CalcScrolledPosition(const int x, const int y, int *xx, int *yy) const
+void wxScrolledWindow::CalcScrolledPosition(int x, int y, int *xx, int *yy) const

 {
 {

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

 }
 
 }
 

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

 {
 {

-  *xx = (float)(x + m_xScrollPosition * m_xScrollPixelsPerLine);
-  *yy = (float)(y + m_yScrollPosition * m_yScrollPixelsPerLine);
+    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 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);
+
+    OnDraw(dc);
+}
+
+// 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 wxScrolledWindow::OnChar(wxKeyEvent& event)
+{
+    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();
+    }
+}