Fixed child positioning on window resizing.

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

diff --git a/src/generic/scrlwing.cpp b/src/generic/scrlwing.cpp
index 31ca6998a2e91d69f9733042fef91a13d0a2a81b..94a3d59f5f4d29dc5de63f66c0883742f3ec0e43 100644 (file)
--- a/src/generic/scrlwing.cpp
+++ b/src/generic/scrlwing.cpp
@@ -2,11 +2,12 @@
 // Name:        generic/scrolwin.cpp
 // Purpose:     wxGenericScrolledWindow implementation
 // Author:      Julian Smart
 // Name:        generic/scrolwin.cpp
 // Purpose:     wxGenericScrolledWindow implementation
 // Author:      Julian Smart

-// Modified by: Vadim Zeitlin on 31.08.00: wxScrollHelper allows to implement
+// Modified by: Vadim Zeitlin on 31.08.00: wxScrollHelper allows to implement.
+//              Ron Lee on 10.4.02:  virtual size / auto scrollbars et al.

 // Created:     01/02/97
 // RCS-ID:      $Id$
 // Created:     01/02/97
 // RCS-ID:      $Id$

-// Copyright:   (c) wxWindows team
-// Licence:     wxWindows license
+// Copyright:   (c) wxWidgets team
+// Licence:     wxWindows licence

 /////////////////////////////////////////////////////////////////////////////
 
 // ============================================================================
 /////////////////////////////////////////////////////////////////////////////
 
 // ============================================================================


@@ -17,7 +18,7 @@
 // headers
 // ----------------------------------------------------------------------------
 
 // headers
 // ----------------------------------------------------------------------------
 

-#ifdef __GNUG__
+#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)

     #pragma implementation "genscrolwin.h"
 #endif
 
     #pragma implementation "genscrolwin.h"
 #endif
 


@@ -39,10 +40,15 @@
 
 #include "wx/scrolwin.h"
 #include "wx/panel.h"
 
 #include "wx/scrolwin.h"
 #include "wx/panel.h"

+#if wxUSE_TIMER

 #include "wx/timer.h"
 #include "wx/timer.h"

+#endif
+#include "wx/sizer.h"
+#include "wx/recguard.h"

 
 #ifdef __WXMSW__
     #include <windows.h> // for DLGC_WANTARROWS
 
 #ifdef __WXMSW__
     #include <windows.h> // for DLGC_WANTARROWS

+    #include "wx/msw/winundef.h"

 #endif
 
 #ifdef __WXMOTIF__
 #endif
 
 #ifdef __WXMOTIF__


@@ -59,12 +65,17 @@
 
 IMPLEMENT_CLASS(wxScrolledWindow, wxGenericScrolledWindow)
 
 
 IMPLEMENT_CLASS(wxScrolledWindow, wxGenericScrolledWindow)
 

+/*
+    TODO PROPERTIES
+        style wxHSCROLL | wxVSCROLL
+*/
+

 // ----------------------------------------------------------------------------
 // wxScrollHelperEvtHandler: intercept the events from the window and forward
 // them to wxScrollHelper
 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 // wxScrollHelperEvtHandler: intercept the events from the window and forward
 // them to wxScrollHelper
 // ----------------------------------------------------------------------------
 

-class wxScrollHelperEvtHandler : public wxEvtHandler
+class WXDLLEXPORT wxScrollHelperEvtHandler : public wxEvtHandler

 {
 public:
     wxScrollHelperEvtHandler(wxScrollHelper *scrollHelper)
 {
 public:
     wxScrollHelperEvtHandler(wxScrollHelper *scrollHelper)


@@ -74,10 +85,17 @@ public:
 
     virtual bool ProcessEvent(wxEvent& event);
 
 
     virtual bool ProcessEvent(wxEvent& event);
 

+    void ResetDrawnFlag() { m_hasDrawnWindow = false; }
+

 private:
     wxScrollHelper *m_scrollHelper;
 private:
     wxScrollHelper *m_scrollHelper;

+
+    bool m_hasDrawnWindow;
+
+    DECLARE_NO_COPY_CLASS(wxScrollHelperEvtHandler)

 };
 
 };
 

+#if wxUSE_TIMER

 // ----------------------------------------------------------------------------
 // wxAutoScrollTimer: the timer used to generate a stream of scroll events when
 // a captured mouse is held outside the window
 // ----------------------------------------------------------------------------
 // wxAutoScrollTimer: the timer used to generate a stream of scroll events when
 // a captured mouse is held outside the window


@@ -98,6 +116,8 @@ private:
     wxEventType m_eventType;
     int m_pos,
         m_orient;
     wxEventType m_eventType;
     int m_pos,
         m_orient;

+
+    DECLARE_NO_COPY_CLASS(wxAutoScrollTimer)

 };
 
 // ============================================================================
 };
 
 // ============================================================================


@@ -160,6 +180,7 @@ void wxAutoScrollTimer::Notify()
         }
     }
 }
         }
     }
 }

+#endif

 
 // ----------------------------------------------------------------------------
 // wxScrollHelperEvtHandler
 
 // ----------------------------------------------------------------------------
 // wxScrollHelperEvtHandler


@@ -167,19 +188,62 @@ void wxAutoScrollTimer::Notify()
 
 bool wxScrollHelperEvtHandler::ProcessEvent(wxEvent& event)
 {
 
 bool wxScrollHelperEvtHandler::ProcessEvent(wxEvent& event)
 {

-    if ( wxEvtHandler::ProcessEvent(event) )
-        return TRUE;
+    wxEventType evType = event.GetEventType();

 
 

-    // reset the skipped flag to FALSE as it might have been set to TRUE in
-    // ProcessEvent() above
-    event.Skip(FALSE);
+    // the explanation of wxEVT_PAINT processing hack: for historic reasons
+    // there are 2 ways to process this event in classes deriving from
+    // wxScrolledWindow. The user code may
+    //
+    //  1. override wxScrolledWindow::OnDraw(dc)
+    //  2. define its own OnPaint() handler
+    //
+    // In addition, in wxUniversal wxWindow defines OnPaint() itself and
+    // always processes the draw event, so we can't just try the window
+    // OnPaint() first and call our HandleOnPaint() if it doesn't process it
+    // (the latter would never be called in wxUniversal).
+    //
+    // So the solution is to have a flag telling us whether the user code drew
+    // anything in the window. We set it to true here but reset it to false in
+    // wxScrolledWindow::OnPaint() handler (which wouldn't be called if the
+    // user code defined OnPaint() in the derived class)
+    m_hasDrawnWindow = true;
+
+    // pass it on to the real handler
+    bool processed = wxEvtHandler::ProcessEvent(event);
+
+    // always process the size events ourselves, even if the user code handles
+    // them as well, as we need to AdjustScrollbars()
+    //
+    // NB: it is important to do it after processing the event in the normal
+    //     way as HandleOnSize() may generate a wxEVT_SIZE itself if the
+    //     scrollbar[s] (dis)appear and it should be seen by the user code
+    //     after this one
+    if ( evType == wxEVT_SIZE )
+    {
+        m_scrollHelper->HandleOnSize((wxSizeEvent &)event);

 
 

-    wxEventType evType = event.GetEventType();
+        return true;
+    }
+
+    if ( processed )
+    {
+        // normally, nothing more to do here - except if it was a paint event
+        // which wasn't really processed, then we'll try to call our
+        // OnDraw() below (from HandleOnPaint)
+        if ( m_hasDrawnWindow )
+        {
+            return true;
+        }
+    }
+
+    // reset the skipped flag to false as it might have been set to true in
+    // ProcessEvent() above
+    event.Skip(false);

 
     if ( evType == wxEVT_PAINT )
     {
         m_scrollHelper->HandleOnPaint((wxPaintEvent &)event);
 
     if ( evType == wxEVT_PAINT )
     {
         m_scrollHelper->HandleOnPaint((wxPaintEvent &)event);

-        return TRUE;
+        return true;

     }
 
     if ( evType == wxEVT_SCROLLWIN_TOP ||
     }
 
     if ( evType == wxEVT_SCROLLWIN_TOP ||


@@ -209,17 +273,13 @@ bool wxScrollHelperEvtHandler::ProcessEvent(wxEvent& event)
         m_scrollHelper->HandleOnMouseWheel((wxMouseEvent &)event);
     }
 #endif // wxUSE_MOUSEWHEEL
         m_scrollHelper->HandleOnMouseWheel((wxMouseEvent &)event);
     }
 #endif // wxUSE_MOUSEWHEEL

-    else if ( evType == wxEVT_SIZE )
-    {
-        m_scrollHelper->HandleOnSize((wxSizeEvent &)event);
-    }

     else if ( evType == wxEVT_CHAR )
     {
         m_scrollHelper->HandleOnChar((wxKeyEvent &)event);
         return !event.GetSkipped();
     }
 
     else if ( evType == wxEVT_CHAR )
     {
         m_scrollHelper->HandleOnChar((wxKeyEvent &)event);
         return !event.GetSkipped();
     }
 

-    return FALSE;
+    return false;

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------


@@ -238,7 +298,7 @@ wxScrollHelper::wxScrollHelper(wxWindow *win)
     m_yScrollLinesPerPage = 0;
 
     m_xScrollingEnabled =
     m_yScrollLinesPerPage = 0;
 
     m_xScrollingEnabled =

-    m_yScrollingEnabled = TRUE;
+    m_yScrollingEnabled = true;

 
     m_scaleX =
     m_scaleY = 1.0;
 
     m_scaleX =
     m_scaleY = 1.0;


@@ -251,27 +311,17 @@ wxScrollHelper::wxScrollHelper(wxWindow *win)
 
     m_timerAutoScroll = (wxTimer *)NULL;
 
 
     m_timerAutoScroll = (wxTimer *)NULL;
 

+    m_handler = NULL;
+

     if ( win )
         SetWindow(win);
 }
 
     if ( win )
         SetWindow(win);
 }
 

-void wxScrollHelper::SetWindow(wxWindow *win)
-{
-    wxCHECK_RET( win, _T("wxScrollHelper needs a window to scroll") );
-
-    m_targetWindow = m_win = win;
-
-    // install the event handler which will intercept the events we're
-    // interested in
-    m_win->PushEventHandler(new wxScrollHelperEvtHandler(this));
-}
-

 wxScrollHelper::~wxScrollHelper()
 {
     StopAutoScrolling();
 
 wxScrollHelper::~wxScrollHelper()
 {
     StopAutoScrolling();
 

-    if ( m_targetWindow )
-        m_targetWindow->PopEventHandler(TRUE /* do delete it */);
+    DeleteEvtHandler();

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------


@@ -292,10 +342,10 @@ void wxScrollHelper::SetScrollbars(int pixelsPerUnitX,
     bool do_refresh =
     (
       (noUnitsX != 0 && m_xScrollLines == 0) ||
     bool do_refresh =
     (
       (noUnitsX != 0 && m_xScrollLines == 0) ||

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

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

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

       (xPos != m_xScrollPosition) ||
       (yPos != m_yScrollPosition)
     );
       (xPos != m_xScrollPosition) ||
       (yPos != m_yScrollPosition)
     );


@@ -304,60 +354,101 @@ void wxScrollHelper::SetScrollbars(int pixelsPerUnitX,
     m_yScrollPixelsPerLine = pixelsPerUnitY;
     m_xScrollPosition = xPos;
     m_yScrollPosition = yPos;
     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.
+    int w = noUnitsX * pixelsPerUnitX;
+    int h = noUnitsY * pixelsPerUnitY;

 
 

-    if ( m_targetWindow->GetWindowStyle() & wxRETAINED )
+    // For better backward compatibility we set persisting limits
+    // here not just the size.  It makes SetScrollbars 'sticky'
+    // emulating the old non-autoscroll behaviour.
+    //   m_targetWindow->SetVirtualSizeHints( w, h );
+
+    // The above should arguably be deprecated, this however we still need.
+
+    // take care not to set 0 virtual size, 0 means that we don't have any
+    // scrollbars and hence we should use the real size instead of the virtual
+    // one which is indicated by using wxDefaultCoord
+    m_targetWindow->SetVirtualSize( w ? w : wxDefaultCoord,
+                                    h ? h : wxDefaultCoord);
+
+    if (do_refresh && !noRefresh)
+        m_targetWindow->Refresh(true, GetScrollRect());
+
+#ifndef __WXUNIVERSAL__
+    // If the target is not the same as the window with the scrollbars,
+    // then we need to update the scrollbars here, since they won't have
+    // been updated by SetVirtualSize().
+    if ( m_targetWindow != m_win )
+#endif // !__WXUNIVERSAL__

     {
     {

-        Display* dpy = XtDisplay((Widget)m_targetWindow->GetMainWidget());
+        AdjustScrollbars();
+    }
+#ifndef __WXUNIVERSAL__
+    else
+    {
+        // otherwise this has been done by AdjustScrollbars, above
+    }
+#endif // !__WXUNIVERSAL__
+}

 
 

-        int totalPixelWidth = m_xScrollLines * m_xScrollPixelsPerLine;
-        int totalPixelHeight = m_yScrollLines * m_yScrollPixelsPerLine;
-        if (m_targetWindow->m_backingPixmap &&
-           !((m_targetWindow->m_pixmapWidth == totalPixelWidth) &&
-             (m_targetWindow->m_pixmapHeight == totalPixelHeight)))
-        {
-            XFreePixmap (dpy, (Pixmap) m_targetWindow->m_backingPixmap);
-            m_targetWindow->m_backingPixmap = (WXPixmap) 0;
-        }
+// ----------------------------------------------------------------------------
+// [target] window handling
+// ----------------------------------------------------------------------------

 
 

-        if (!m_targetWindow->m_backingPixmap &&
-           (noUnitsX != 0) && (noUnitsY != 0))
+void wxScrollHelper::DeleteEvtHandler()
+{
+    // search for m_handler in the handler list
+    if ( m_win && m_handler )
+    {
+        if ( m_win->RemoveEventHandler(m_handler) )

         {
         {

-            int depth = wxDisplayDepth();
-            m_pixmapWidth = totalPixelWidth;
-            m_pixmapHeight = totalPixelHeight;
-            m_backingPixmap = (WXPixmap) XCreatePixmap (dpy, RootWindow (dpy, DefaultScreen (dpy)),
-            m_pixmapWidth, m_pixmapHeight, depth);
+            delete m_handler;

         }
         }

+        //else: something is very wrong, so better [maybe] leak memory than
+        //      risk a crash because of double deletion

 
 

+        m_handler = NULL;

     }
     }

-#endif // Motif
+}

 
 

-    AdjustScrollbars();
+void wxScrollHelper::SetWindow(wxWindow *win)
+{
+    wxCHECK_RET( win, _T("wxScrollHelper needs a window to scroll") );

 
 

-    if (do_refresh && !noRefresh)
-        m_targetWindow->Refresh(TRUE, GetRect());
+    m_win = win;
+
+    // by default, the associated window is also the target window
+    DoSetTargetWindow(win);
+}

 
 

+void wxScrollHelper::DoSetTargetWindow(wxWindow *target)
+{
+    m_targetWindow = target;

 #ifdef __WXMAC__
 #ifdef __WXMAC__

-    m_targetWindow->MacUpdateImmediately() ;
+    target->MacSetClipChildren( true ) ;

 #endif
 #endif

-}

 
 

-// ----------------------------------------------------------------------------
-// target window handling
-// ----------------------------------------------------------------------------
+    // install the event handler which will intercept the events we're
+    // interested in (but only do it for our real window, not the target window
+    // which we scroll - we don't need to hijack its events)
+    if ( m_targetWindow == m_win )
+    {
+        // if we already have a handler, delete it first
+        DeleteEvtHandler();

 
 

-void wxScrollHelper::SetTargetWindow( wxWindow *target )
+        m_handler = new wxScrollHelperEvtHandler(this);
+        m_targetWindow->PushEventHandler(m_handler);
+    }
+}
+
+void wxScrollHelper::SetTargetWindow(wxWindow *target)

 {
 {

-    wxASSERT_MSG( target, wxT("target window must not be NULL") );
-    m_targetWindow = target;
+    wxCHECK_RET( target, wxT("target window must not be NULL") );
+
+    if ( target == m_targetWindow )
+        return;
+
+    DoSetTargetWindow(target);

 }
 
 wxWindow *wxScrollHelper::GetTargetWindow() const
 }
 
 wxWindow *wxScrollHelper::GetTargetWindow() const


@@ -384,15 +475,15 @@ void wxScrollHelper::HandleOnScroll(wxScrollWinEvent& event)
     if (orient == wxHORIZONTAL)
     {
         m_xScrollPosition += nScrollInc;
     if (orient == wxHORIZONTAL)
     {
         m_xScrollPosition += nScrollInc;

-        m_targetWindow->SetScrollPos(wxHORIZONTAL, m_xScrollPosition, FALSE);
+        m_win->SetScrollPos(wxHORIZONTAL, m_xScrollPosition);

     }
     else
     {
         m_yScrollPosition += nScrollInc;
     }
     else
     {
         m_yScrollPosition += nScrollInc;

-        m_targetWindow->SetScrollPos(wxVERTICAL, m_yScrollPosition, FALSE);
+        m_win->SetScrollPos(wxVERTICAL, m_yScrollPosition);

     }
 
     }
 

-    bool needsRefresh = FALSE;
+    bool needsRefresh = false;

     int dx = 0,
         dy = 0;
     if (orient == wxHORIZONTAL)
     int dx = 0,
         dy = 0;
     if (orient == wxHORIZONTAL)


@@ -403,7 +494,7 @@ void wxScrollHelper::HandleOnScroll(wxScrollWinEvent& event)
        }
        else
        {
        }
        else
        {

-           needsRefresh = TRUE;
+           needsRefresh = true;

        }
     }
     else
        }
     }
     else


@@ -414,22 +505,18 @@ void wxScrollHelper::HandleOnScroll(wxScrollWinEvent& event)
         }
         else
         {
         }
         else
         {

-            needsRefresh = TRUE;
+            needsRefresh = true;

         }
     }
 
     if ( needsRefresh )
     {
         }
     }
 
     if ( needsRefresh )
     {

-        m_targetWindow->Refresh(TRUE, GetRect());
+        m_targetWindow->Refresh(true, GetScrollRect());

     }
     else
     {
     }
     else
     {

-        m_targetWindow->ScrollWindow(dx, dy, GetRect());
+        m_targetWindow->ScrollWindow(dx, dy, GetScrollRect());

     }
     }

-
-#ifdef __WXMAC__
-    m_targetWindow->MacUpdateImmediately() ;
-#endif

 }
 
 int wxScrollHelper::CalcScrollInc(wxScrollWinEvent& event)
 }
 
 int wxScrollHelper::CalcScrollInc(wxScrollWinEvent& event)


@@ -487,41 +574,48 @@ int wxScrollHelper::CalcScrollInc(wxScrollWinEvent& event)
     {
         if (m_xScrollPixelsPerLine > 0)
         {
     {
         if (m_xScrollPixelsPerLine > 0)
         {

-            int w, h;
-            GetTargetSize(&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
+            if ( m_xScrollPosition + nScrollInc < 0 )
+            {
+                // As -ve as we can go
+                nScrollInc = -m_xScrollPosition;
+            }
+            else // check for the other bound
+            {
+                const int posMax = m_xScrollLines - m_xScrollLinesPerPage;
+                if ( m_xScrollPosition + nScrollInc > posMax )
+                {
+                    // As +ve as we can go
+                    nScrollInc = posMax - m_xScrollPosition;
+                }
+            }

         }
         else
         }
         else

-            m_targetWindow->Refresh(TRUE, GetRect());
+            m_targetWindow->Refresh(true, GetScrollRect());

     }
     else
     {
     }
     else
     {

-        if (m_yScrollPixelsPerLine > 0)
+        if ( m_yScrollPixelsPerLine > 0 )

         {
         {

-            int w, h;
-            GetTargetSize(&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
+            if ( m_yScrollPosition + nScrollInc < 0 )
+            {
+                // As -ve as we can go
+                nScrollInc = -m_yScrollPosition;
+            }
+            else // check for the other bound
+            {
+                const int posMax = m_yScrollLines - m_yScrollLinesPerPage;
+                if ( m_yScrollPosition + nScrollInc > posMax )
+                {
+                    // As +ve as we can go
+                    nScrollInc = posMax - m_yScrollPosition;
+                }
+            }

         }
         else
         }
         else

-            m_targetWindow->Refresh(TRUE, GetRect());
+        {
+            // VZ: why do we do this? (FIXME)
+            m_targetWindow->Refresh(true, GetScrollRect());
+        }

     }
 
     return nScrollInc;
     }
 
     return nScrollInc;


@@ -530,85 +624,196 @@ int wxScrollHelper::CalcScrollInc(wxScrollWinEvent& event)
 // Adjust the scrollbars - new version.
 void wxScrollHelper::AdjustScrollbars()
 {
 // Adjust the scrollbars - new version.
 void wxScrollHelper::AdjustScrollbars()
 {

-#ifdef __WXMAC__
-    m_targetWindow->MacUpdateImmediately();
-#endif
+    static wxRecursionGuardFlag s_flagReentrancy;
+    wxRecursionGuard guard(s_flagReentrancy);
+    if ( guard.IsInside() )
+    {
+        // don't reenter AdjustScrollbars() while another call to
+        // AdjustScrollbars() is in progress because this may lead to calling
+        // ScrollWindow() twice and this can really happen under MSW if
+        // SetScrollbar() call below adds or removes the scrollbar which
+        // changes the window size and hence results in another
+        // AdjustScrollbars() call
+        return;
+    }

 
 

-    int w, h;
-    GetTargetSize(&w, &h);
+    int w = 0, h = 0;
+    int oldw, oldh;

 
     int oldXScroll = m_xScrollPosition;
     int oldYScroll = m_yScrollPosition;
 
 
     int oldXScroll = m_xScrollPosition;
     int oldYScroll = m_yScrollPosition;
 

-    if (m_xScrollLines > 0)
+    // VZ: at least under Windows this loop is useless because when scrollbars
+    //     [dis]appear we get a WM_SIZE resulting in another call to
+    //     AdjustScrollbars() anyhow. As it doesn't seem to do any harm I leave
+    //     it here for now but it would be better to ensure that all ports
+    //     generate EVT_SIZE when scrollbars [dis]appear, emulating it if
+    //     necessary, and remove it later
+    do

     {
     {

-        // 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;
-        if ( noPagePositions > m_xScrollLines )
-            noPagePositions = m_xScrollLines;
+        GetTargetSize(&w, 0);

 
 

-        // 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 );
+        // scroll lines per page: if 0, no scrolling is needed
+        int linesPerPage;
+
+        if ( m_xScrollPixelsPerLine == 0 )
+        {
+            // scrolling is disabled
+            m_xScrollLines = 0;
+            m_xScrollPosition = 0;
+            linesPerPage = 0;
+        }
+        else // might need scrolling
+        {
+            // Round up integer division to catch any "leftover" client space.
+            const int wVirt = m_targetWindow->GetVirtualSize().GetWidth();
+            m_xScrollLines = (wVirt + m_xScrollPixelsPerLine - 1) / m_xScrollPixelsPerLine;
+
+            // Calculate page size i.e. number of scroll units you get on the
+            // current client window.
+            linesPerPage = w / m_xScrollPixelsPerLine;
+
+            // Special case. When client and virtual size are very close but
+            // the client is big enough, kill scrollbar.
+            if ((linesPerPage < m_xScrollLines) && (w >= wVirt)) ++linesPerPage;
+
+            if (linesPerPage >= m_xScrollLines)
+            {
+                // we're big enough to not need scrolling
+                linesPerPage =
+                m_xScrollLines =
+                m_xScrollPosition = 0;
+            }
+            else // we do need a scrollbar
+            {
+                if ( linesPerPage < 1 )
+                    linesPerPage = 1;
+
+                // Correct position if greater than extent of canvas minus
+                // the visible portion of it or if below zero
+                const int posMax = m_xScrollLines - linesPerPage;
+                if ( m_xScrollPosition > posMax )
+                    m_xScrollPosition = posMax;
+                else if ( m_xScrollPosition < 0 )
+                    m_xScrollPosition = 0;
+            }
+        }
+
+        m_win->SetScrollbar(wxHORIZONTAL, m_xScrollPosition,
+                            linesPerPage, m_xScrollLines);

 
 

-        m_targetWindow->SetScrollbar(wxHORIZONTAL, m_xScrollPosition, noPagePositions, m_xScrollLines);

         // The amount by which we scroll when paging
         // The amount by which we scroll when paging

-        SetScrollPageSize(wxHORIZONTAL, noPagePositions);
-    }
-    else
-    {
-        m_xScrollPosition = 0;
-        m_targetWindow->SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);
-    }
+        SetScrollPageSize(wxHORIZONTAL, linesPerPage);

 
 

-    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;
-        if ( noPagePositions > m_yScrollLines )
-            noPagePositions = m_yScrollLines;
+        GetTargetSize(0, &h);

 
 

-        // 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 ( m_yScrollPixelsPerLine == 0 )
+        {
+            // scrolling is disabled
+            m_yScrollLines = 0;
+            m_yScrollPosition = 0;
+            linesPerPage = 0;
+        }
+        else // might need scrolling
+        {
+            // Round up integer division to catch any "leftover" client space.
+            const int hVirt = m_targetWindow->GetVirtualSize().GetHeight();
+            m_yScrollLines = ( hVirt + m_yScrollPixelsPerLine - 1 ) / m_yScrollPixelsPerLine;
+
+            // Calculate page size i.e. number of scroll units you get on the
+            // current client window.
+            linesPerPage = h / m_yScrollPixelsPerLine;
+
+            // Special case. When client and virtual size are very close but
+            // the client is big enough, kill scrollbar.
+            if ((linesPerPage < m_yScrollLines) && (h >= hVirt)) ++linesPerPage;
+
+            if (linesPerPage >= m_yScrollLines)
+            {
+                // we're big enough to not need scrolling
+                linesPerPage =
+                m_yScrollLines =
+                m_yScrollPosition = 0;
+            }
+            else // we do need a scrollbar
+            {
+                if ( linesPerPage < 1 )
+                    linesPerPage = 1;
+
+                // Correct position if greater than extent of canvas minus
+                // the visible portion of it or if below zero
+                const int posMax = m_yScrollLines - linesPerPage;
+                if ( m_yScrollPosition > posMax )
+                    m_yScrollPosition = posMax;
+                else if ( m_yScrollPosition < 0 )
+                    m_yScrollPosition = 0;
+            }
+        }
+
+        m_win->SetScrollbar(wxVERTICAL, m_yScrollPosition,
+                            linesPerPage, m_yScrollLines);

 
 

-        m_targetWindow->SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, m_yScrollLines);

         // The amount by which we scroll when paging
         // The amount by which we scroll when paging

-        SetScrollPageSize(wxVERTICAL, noPagePositions);
-    }
-    else
+        SetScrollPageSize(wxVERTICAL, linesPerPage);
+
+
+        // If a scrollbar (dis)appeared as a result of this, adjust them again.
+        oldw = w;
+        oldh = h;
+
+        GetTargetSize( &w, &h );
+    } while ( w != oldw || h != oldh );
+
+#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_targetWindow->GetWindowStyle() & wxRETAINED )

     {
     {

-        m_yScrollPosition = 0;
-        m_targetWindow->SetScrollbar (wxVERTICAL, 0, 0, 0, FALSE);
+        Display* dpy = XtDisplay((Widget)m_targetWindow->GetMainWidget());
+
+        int totalPixelWidth = m_xScrollLines * m_xScrollPixelsPerLine;
+        int totalPixelHeight = m_yScrollLines * m_yScrollPixelsPerLine;
+        if (m_targetWindow->GetBackingPixmap() &&
+           !((m_targetWindow->GetPixmapWidth() == totalPixelWidth) &&
+             (m_targetWindow->GetPixmapHeight() == totalPixelHeight)))
+        {
+            XFreePixmap (dpy, (Pixmap) m_targetWindow->GetBackingPixmap());
+            m_targetWindow->SetBackingPixmap((WXPixmap) 0);
+        }
+
+        if (!m_targetWindow->GetBackingPixmap() &&
+           (m_xScrollLines != 0) && (m_yScrollLines != 0))
+        {
+            int depth = wxDisplayDepth();
+            m_targetWindow->SetPixmapWidth(totalPixelWidth);
+            m_targetWindow->SetPixmapHeight(totalPixelHeight);
+            m_targetWindow->SetBackingPixmap((WXPixmap) XCreatePixmap (dpy, RootWindow (dpy, DefaultScreen (dpy)),
+              m_targetWindow->GetPixmapWidth(), m_targetWindow->GetPixmapHeight(), depth));
+        }
+

     }
     }

+#endif // Motif

 
     if (oldXScroll != m_xScrollPosition)
     {
        if (m_xScrollingEnabled)
 
     if (oldXScroll != m_xScrollPosition)
     {
        if (m_xScrollingEnabled)

-            m_targetWindow->ScrollWindow( m_xScrollPixelsPerLine * (oldXScroll-m_xScrollPosition), 0,
-                                          GetRect() );
+            m_targetWindow->ScrollWindow( m_xScrollPixelsPerLine * (oldXScroll - m_xScrollPosition), 0,
+                                          GetScrollRect() );

        else
        else

-            m_targetWindow->Refresh(TRUE, GetRect());
+            m_targetWindow->Refresh(true, GetScrollRect());

     }
 
     if (oldYScroll != m_yScrollPosition)
     {
         if (m_yScrollingEnabled)
             m_targetWindow->ScrollWindow( 0, m_yScrollPixelsPerLine * (oldYScroll-m_yScrollPosition),
     }
 
     if (oldYScroll != m_yScrollPosition)
     {
         if (m_yScrollingEnabled)
             m_targetWindow->ScrollWindow( 0, m_yScrollPixelsPerLine * (oldYScroll-m_yScrollPosition),

-                                          GetRect() );
+                                          GetScrollRect() );

         else
         else

-            m_targetWindow->Refresh(TRUE, GetRect());
+            m_targetWindow->Refresh(true, GetScrollRect());

     }
     }

-
-#ifdef __WXMAC__
-    m_targetWindow->MacUpdateImmediately();
-#endif

 }
 
 void wxScrollHelper::DoPrepareDC(wxDC& dc)
 }
 
 void wxScrollHelper::DoPrepareDC(wxDC& dc)


@@ -619,6 +824,24 @@ void wxScrollHelper::DoPrepareDC(wxDC& dc)
     dc.SetUserScale( m_scaleX, m_scaleY );
 }
 
     dc.SetUserScale( m_scaleX, m_scaleY );
 }
 

+void wxScrollHelper::SetScrollRate( int xstep, int ystep )
+{
+    int old_x = m_xScrollPixelsPerLine * m_xScrollPosition;
+    int old_y = m_yScrollPixelsPerLine * m_yScrollPosition;
+
+    m_xScrollPixelsPerLine = xstep;
+    m_yScrollPixelsPerLine = ystep;
+
+    int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
+    int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
+
+    m_win->SetScrollPos( wxHORIZONTAL, m_xScrollPosition );
+    m_win->SetScrollPos( wxVERTICAL, m_yScrollPosition );
+    m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
+
+    AdjustScrollbars();
+}
+

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


@@ -654,10 +877,6 @@ void wxScrollHelper::Scroll( int x_pos, int y_pos )
     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 
     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
 

-#ifdef __WXMAC__
-    m_targetWindow->MacUpdateImmediately();
-#endif
-

     int w, h;
     GetTargetSize(&w, &h);
 
     int w, h;
     GetTargetSize(&w, &h);
 


@@ -677,9 +896,9 @@ void wxScrollHelper::Scroll( int x_pos, int y_pos )
         m_xScrollPosition = wxMax( 0, m_xScrollPosition );
 
         if (old_x != m_xScrollPosition) {
         m_xScrollPosition = wxMax( 0, m_xScrollPosition );
 
         if (old_x != m_xScrollPosition) {

-            m_targetWindow->SetScrollPos( wxHORIZONTAL, m_xScrollPosition, FALSE );
+            m_win->SetScrollPos( wxHORIZONTAL, m_xScrollPosition );

             m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0,
             m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0,

-                                          GetRect() );
+                                          GetScrollRect() );

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


@@ -698,16 +917,11 @@ void wxScrollHelper::Scroll( int x_pos, int y_pos )
         m_yScrollPosition = wxMax( 0, m_yScrollPosition );
 
         if (old_y != m_yScrollPosition) {
         m_yScrollPosition = wxMax( 0, m_yScrollPosition );
 
         if (old_y != m_yScrollPosition) {

-            m_targetWindow->SetScrollPos( wxVERTICAL, m_yScrollPosition, FALSE );
+            m_win->SetScrollPos( wxVERTICAL, m_yScrollPosition );

             m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine,
             m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine,

-                                          GetRect() );
+                                          GetScrollRect() );

         }
     }
         }
     }

-
-#ifdef __WXMAC__
-    m_targetWindow->MacUpdateImmediately();
-#endif
-

 }
 
 void wxScrollHelper::EnableScrolling (bool x_scroll, bool y_scroll)
 }
 
 void wxScrollHelper::EnableScrolling (bool x_scroll, bool y_scroll)


@@ -716,14 +930,6 @@ void wxScrollHelper::EnableScrolling (bool x_scroll, bool y_scroll)
     m_yScrollingEnabled = y_scroll;
 }
 
     m_yScrollingEnabled = y_scroll;
 }
 

-void wxScrollHelper::GetVirtualSize (int *x, int *y) const
-{
-    if ( x )
-        *x = m_xScrollPixelsPerLine * m_xScrollLines;
-    if ( y )
-        *y = m_yScrollPixelsPerLine * m_yScrollLines;
-}
-

 // Where the current view starts from
 void wxScrollHelper::GetViewStart (int *x, int *y) const
 {
 // Where the current view starts from
 void wxScrollHelper::GetViewStart (int *x, int *y) const
 {


@@ -733,7 +939,16 @@ void wxScrollHelper::GetViewStart (int *x, int *y) const
         *y = m_yScrollPosition;
 }
 
         *y = m_yScrollPosition;
 }
 

-void wxScrollHelper::CalcScrolledPosition(int x, int y, int *xx, int *yy) const
+#if WXWIN_COMPATIBILITY_2_2
+
+void wxScrollHelper::ViewStart(int *x, int *y) const
+{
+    GetViewStart( x, y );
+}
+
+#endif // WXWIN_COMPATIBILITY_2_2
+
+void wxScrollHelper::DoCalcScrolledPosition(int x, int y, int *xx, int *yy) const

 {
     if ( xx )
         *xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;
 {
     if ( xx )
         *xx = x - m_xScrollPosition * m_xScrollPixelsPerLine;


@@ -741,7 +956,7 @@ void wxScrollHelper::CalcScrolledPosition(int x, int y, int *xx, int *yy) const
         *yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
 }
 
         *yy = y - m_yScrollPosition * m_yScrollPixelsPerLine;
 }
 

-void wxScrollHelper::CalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
+void wxScrollHelper::DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) const

 {
     if ( xx )
         *xx = x + m_xScrollPosition * m_xScrollPixelsPerLine;
 {
     if ( xx )
         *xx = x + m_xScrollPosition * m_xScrollPixelsPerLine;


@@ -756,19 +971,25 @@ void wxScrollHelper::CalcUnscrolledPosition(int x, int y, int *xx, int *yy) cons
 // Default OnSize resets scrollbars, if any
 void wxScrollHelper::HandleOnSize(wxSizeEvent& WXUNUSED(event))
 {
 // Default OnSize resets scrollbars, if any
 void wxScrollHelper::HandleOnSize(wxSizeEvent& WXUNUSED(event))
 {

-#if wxUSE_CONSTRAINTS

     if ( m_targetWindow->GetAutoLayout() )
     if ( m_targetWindow->GetAutoLayout() )

-        m_targetWindow->Layout();
-#endif
-
-    AdjustScrollbars();
+    {
+        wxSize size = m_targetWindow->GetBestVirtualSize();
+        
+        // This will call ::Layout() and ::AdjustScrollbars()
+        m_win->SetVirtualSize( size );
+    }
+    else
+    {
+        AdjustScrollbars();
+    }

 }
 
 // This calls OnDraw, having adjusted the origin according to the current
 // scroll position
 void wxScrollHelper::HandleOnPaint(wxPaintEvent& WXUNUSED(event))
 {
 }
 
 // This calls OnDraw, having adjusted the origin according to the current
 // scroll position
 void wxScrollHelper::HandleOnPaint(wxPaintEvent& WXUNUSED(event))
 {

-    wxPaintDC dc(m_targetWindow);
+    // don't use m_targetWindow here, this is always called for ourselves
+    wxPaintDC dc(m_win);

     DoPrepareDC(dc);
 
     OnDraw(dc);
     DoPrepareDC(dc);
 
     OnDraw(dc);


@@ -786,7 +1007,7 @@ void wxScrollHelper::HandleOnChar(wxKeyEvent& event)
 
     GetViewStart(&stx, &sty);
     GetTargetSize(&clix, &cliy);
 
     GetViewStart(&stx, &sty);
     GetTargetSize(&clix, &cliy);

-    GetVirtualSize(&szx, &szy);
+    m_targetWindow->GetVirtualSize(&szx, &szy);

 
     if( m_xScrollPixelsPerLine )
     {
 
     if( m_xScrollPixelsPerLine )
     {


@@ -809,8 +1030,11 @@ void wxScrollHelper::HandleOnChar(wxKeyEvent& event)
         szy = -1;
     }
 
         szy = -1;
     }
 

+    int xScrollOld = m_xScrollPosition,
+        yScrollOld = m_yScrollPosition;
+

     int dsty;
     int dsty;

-    switch ( event.KeyCode() )
+    switch ( event.GetKeyCode() )

     {
         case WXK_PAGEUP:
         case WXK_PRIOR:
     {
         case WXK_PAGEUP:
         case WXK_PRIOR:


@@ -851,6 +1075,22 @@ void wxScrollHelper::HandleOnChar(wxKeyEvent& event)
             // not for us
             event.Skip();
     }
             // not for us
             event.Skip();
     }

+
+    if ( m_xScrollPosition != xScrollOld )
+    {
+        wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, m_xScrollPosition,
+                               wxHORIZONTAL);
+        event.SetEventObject(m_win);
+        m_win->GetEventHandler()->ProcessEvent(event);
+    }
+
+    if ( m_yScrollPosition != yScrollOld )
+    {
+        wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, m_yScrollPosition,
+                               wxVERTICAL);
+        event.SetEventObject(m_win);
+        m_win->GetEventHandler()->ProcessEvent(event);
+    }

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------


@@ -867,11 +1107,13 @@ bool wxScrollHelper::SendAutoScrollEvents(wxScrollWinEvent& event) const
 
 void wxScrollHelper::StopAutoScrolling()
 {
 
 void wxScrollHelper::StopAutoScrolling()
 {

+#if wxUSE_TIMER

     if ( m_timerAutoScroll )
     {
         delete m_timerAutoScroll;
         m_timerAutoScroll = (wxTimer *)NULL;
     }
     if ( m_timerAutoScroll )
     {
         delete m_timerAutoScroll;
         m_timerAutoScroll = (wxTimer *)NULL;
     }

+#endif

 }
 
 void wxScrollHelper::HandleOnMouseEnter(wxMouseEvent& event)
 }
 
 void wxScrollHelper::HandleOnMouseEnter(wxMouseEvent& event)


@@ -933,6 +1175,7 @@ void wxScrollHelper::HandleOnMouseLeave(wxMouseEvent& event)
         if ( !m_targetWindow->HasScrollbar(orient) )
             return;
 
         if ( !m_targetWindow->HasScrollbar(orient) )
             return;
 

+#if wxUSE_TIMER

         delete m_timerAutoScroll;
         m_timerAutoScroll = new wxAutoScrollTimer
                                 (
         delete m_timerAutoScroll;
         m_timerAutoScroll = new wxAutoScrollTimer
                                 (


@@ -943,6 +1186,9 @@ void wxScrollHelper::HandleOnMouseLeave(wxMouseEvent& event)
                                     orient
                                 );
         m_timerAutoScroll->Start(50); // FIXME: make configurable
                                     orient
                                 );
         m_timerAutoScroll->Start(50); // FIXME: make configurable

+#else
+        wxUnusedVar(pos);
+#endif

     }
 }
 
     }
 }
 


@@ -956,11 +1202,34 @@ void wxScrollHelper::HandleOnMouseWheel(wxMouseEvent& event)
 
     if (lines != 0)
     {
 
     if (lines != 0)
     {

-        lines *= event.GetLinesPerAction();

 
 

-        int vsx, vsy;
-        GetViewStart(&vsx, &vsy);
-        Scroll(-1, vsy - lines);
+        wxScrollWinEvent newEvent;
+
+        newEvent.SetPosition(0);
+        newEvent.SetOrientation(wxVERTICAL);
+        newEvent.SetEventObject(m_win);
+
+        if (event.IsPageScroll())
+        {
+            if (lines > 0)
+                newEvent.SetEventType(wxEVT_SCROLLWIN_PAGEUP);
+            else
+                newEvent.SetEventType(wxEVT_SCROLLWIN_PAGEDOWN);
+
+            m_win->GetEventHandler()->ProcessEvent(newEvent);
+        }
+        else
+        {
+            lines *= event.GetLinesPerAction();
+            if (lines > 0)
+                newEvent.SetEventType(wxEVT_SCROLLWIN_LINEUP);
+            else
+                newEvent.SetEventType(wxEVT_SCROLLWIN_LINEDOWN);
+
+            int times = abs(lines);
+            for (; times > 0; times--)
+                m_win->GetEventHandler()->ProcessEvent(newEvent);
+        }

     }
 }
 
     }
 }
 


@@ -972,6 +1241,10 @@ void wxScrollHelper::HandleOnMouseWheel(wxMouseEvent& event)
 
 IMPLEMENT_DYNAMIC_CLASS(wxGenericScrolledWindow, wxPanel)
 
 
 IMPLEMENT_DYNAMIC_CLASS(wxGenericScrolledWindow, wxPanel)
 

+BEGIN_EVENT_TABLE(wxGenericScrolledWindow, wxPanel)
+    EVT_PAINT(wxGenericScrolledWindow::OnPaint)
+END_EVENT_TABLE()
+

 bool wxGenericScrolledWindow::Create(wxWindow *parent,
                               wxWindowID id,
                               const wxPoint& pos,
 bool wxGenericScrolledWindow::Create(wxWindow *parent,
                               wxWindowID id,
                               const wxPoint& pos,


@@ -980,13 +1253,11 @@ bool wxGenericScrolledWindow::Create(wxWindow *parent,
                               const wxString& name)
 {
     m_targetWindow = this;
                               const wxString& name)
 {
     m_targetWindow = this;

+#ifdef __WXMAC__
+    MacSetClipChildren( true ) ;
+#endif

 
 

-    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__
+    bool ok = wxPanel::Create(parent, id, pos, size, style|wxHSCROLL|wxVSCROLL, name);

 
     return ok;
 }
 
     return ok;
 }


@@ -995,21 +1266,117 @@ wxGenericScrolledWindow::~wxGenericScrolledWindow()
 {
 }
 
 {
 }
 

-#if WXWIN_COMPATIBILITY
-void wxGenericScrolledWindow::GetScrollUnitsPerPage (int *x_page, int *y_page) const
+bool wxGenericScrolledWindow::Layout()

 {
 {

-      *x_page = GetScrollPageSize(wxHORIZONTAL);
-      *y_page = GetScrollPageSize(wxVERTICAL);
+    if (GetSizer() && m_targetWindow == this)
+    {
+        // If we're the scroll target, take into account the
+        // virtual size and scrolled position of the window.
+
+        int x, y, w, h;
+        CalcScrolledPosition(0,0, &x,&y);
+        GetVirtualSize(&w, &h);
+        GetSizer()->SetDimension(x, y, w, h);
+        return true;
+    }
+
+    // fall back to default for LayoutConstraints
+    return wxPanel::Layout();

 }
 
 }
 

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

 {
 {

-    if ( xx )
-        *xx = (float)(x + m_xScrollPosition * m_xScrollPixelsPerLine);
-    if ( yy )
-        *yy = (float)(y + m_yScrollPosition * m_yScrollPixelsPerLine);
+    wxPanel::DoSetVirtualSize( x, y );
+    AdjustScrollbars();
+
+    if (GetAutoLayout())
+        Layout();

 }
 }

-#endif // WXWIN_COMPATIBILITY
+
+// wxWindow's GetBestVirtualSize returns the actual window size,
+// whereas we want to return the virtual size
+wxSize wxGenericScrolledWindow::GetBestVirtualSize() const
+{
+    wxSize  clientSize( GetClientSize() );
+    if (GetSizer())
+    {
+        wxSize minSize( GetSizer()->CalcMin() );
+
+        return wxSize( wxMax( clientSize.x, minSize.x ), wxMax( clientSize.y, minSize.y ) );
+    }
+    else
+        return clientSize;
+}
+
+// return the size best suited for the current window
+// (this isn't a virtual size, this is a sensible size for the window)
+wxSize wxGenericScrolledWindow::DoGetBestSize() const
+{
+    wxSize best;
+
+    if ( GetSizer() )
+    {
+        wxSize b = GetSizer()->GetMinSize();
+
+        // Only use the content to set the window size in the direction
+        // where there's no scrolling; otherwise we're going to get a huge
+        // window in the direction in which scrolling is enabled
+        int ppuX, ppuY;
+        GetScrollPixelsPerUnit(& ppuX, & ppuY);
+
+        wxSize minSize;
+        if ( GetMinSize().IsFullySpecified() )
+            minSize = GetMinSize();
+        else
+            minSize = GetSize();
+
+        if (ppuX > 0)
+            b.x = minSize.x;
+        if (ppuY > 0)
+            b.y = minSize.y;
+        best = b;
+    }
+    else
+        return wxWindow::DoGetBestSize();
+
+    // Add any difference between size and client size
+    wxSize diff = GetSize() - GetClientSize();
+    best.x += wxMax(0, diff.x);
+    best.y += wxMax(0, diff.y);
+
+    return best;
+}
+
+void wxGenericScrolledWindow::OnPaint(wxPaintEvent& event)
+{
+    // the user code didn't really draw the window if we got here, so set this
+    // flag to try to call OnDraw() later
+    m_handler->ResetDrawnFlag();
+
+    event.Skip();
+}
+
+#ifdef __WXMSW__
+WXLRESULT
+wxGenericScrolledWindow::MSWWindowProc(WXUINT nMsg,
+                                       WXWPARAM wParam,
+                                       WXLPARAM lParam)
+{
+    WXLRESULT rc = wxPanel::MSWWindowProc(nMsg, wParam, lParam);
+
+#ifndef __WXWINCE__
+    // we need to process arrows ourselves for scrolling
+    if ( nMsg == WM_GETDLGCODE )
+    {
+        rc |= DLGC_WANTARROWS;
+    }
+#endif
+
+    return rc;
+}
+
+#endif // __WXMSW__

 
 #endif // !wxGTK
 
 
 #endif // !wxGTK
 

+// vi:sts=4:sw=4:et