added EVT_HEADER_DRAGGING_CANCELLED event sent when either resizing or reordering...

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

diff --git a/src/generic/scrlwing.cpp b/src/generic/scrlwing.cpp
index 8dab9a85f11d943a0698ee96d1c7b6019854bafd..c3f25599f9f1b9f113ce8bf1d7b81b1fafdc4a0d 100644 (file)
--- a/src/generic/scrlwing.cpp
+++ b/src/generic/scrlwing.cpp
@@ -1,12 +1,12 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

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

 // Author:      Julian Smart
 // 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:      $Id$
 // Author:      Julian Smart
 // 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:      $Id$

-// Copyright:   (c) wxWindows team
+// Copyright:   (c) wxWidgets team

 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 


@@ -18,14 +18,6 @@
 // headers
 // ----------------------------------------------------------------------------
 
 // headers
 // ----------------------------------------------------------------------------
 

-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-    #pragma implementation "genscrolwin.h"
-#endif
-
-#ifdef __VMS
-#define XtDisplay XTDISPLAY
-#endif
-

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


@@ -33,21 +25,26 @@
     #pragma hdrstop
 #endif
 
     #pragma hdrstop
 #endif
 

-#if !defined(__WXGTK__) || defined(__WXUNIVERSAL__)
+#include "wx/scrolwin.h"

 
 

-#include "wx/utils.h"
-#include "wx/dcclient.h"
+#ifndef WX_PRECOMP
+    #include "wx/utils.h"
+    #include "wx/panel.h"
+    #include "wx/dcclient.h"
+    #include "wx/timer.h"
+    #include "wx/sizer.h"
+    #include "wx/settings.h"
+#endif

 
 

-#include "wx/scrolwin.h"
-#include "wx/panel.h"
-#if wxUSE_TIMER
-#include "wx/timer.h"
+#ifdef __WXMAC__
+#include "wx/scrolbar.h"

 #endif
 #endif

-#include "wx/sizer.h"
+

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

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

 #endif
 
 #ifdef __WXMOTIF__
 #endif
 
 #ifdef __WXMOTIF__


@@ -62,11 +59,9 @@
 #endif
 #endif
 
 #endif
 #endif
 

-IMPLEMENT_CLASS(wxScrolledWindow, wxGenericScrolledWindow)
-

 /*
 /*

-       TODO PROPERTIES
-               style wxHSCROLL | wxVSCROLL
+    TODO PROPERTIES
+        style wxHSCROLL | wxVSCROLL

 */
 
 // ----------------------------------------------------------------------------
 */
 
 // ----------------------------------------------------------------------------


@@ -84,7 +79,7 @@ public:
 
     virtual bool ProcessEvent(wxEvent& event);
 
 
     virtual bool ProcessEvent(wxEvent& event);
 

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

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


@@ -205,7 +200,7 @@ bool wxScrollHelperEvtHandler::ProcessEvent(wxEvent& event)
     // 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)
     // 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;
+    m_hasDrawnWindow = true;

 
     // pass it on to the real handler
     bool processed = wxEvtHandler::ProcessEvent(event);
 
     // pass it on to the real handler
     bool processed = wxEvtHandler::ProcessEvent(event);


@@ -221,7 +216,7 @@ bool wxScrollHelperEvtHandler::ProcessEvent(wxEvent& event)
     {
         m_scrollHelper->HandleOnSize((wxSizeEvent &)event);
 
     {
         m_scrollHelper->HandleOnSize((wxSizeEvent &)event);
 

-        return TRUE;
+        return true;

     }
 
     if ( processed )
     }
 
     if ( processed )


@@ -229,22 +224,30 @@ bool wxScrollHelperEvtHandler::ProcessEvent(wxEvent& event)
         // 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)
         // 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 )
+        if ( m_hasDrawnWindow || event.IsCommandEvent() )

         {
         {

-            return TRUE;
+            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_CHILD_FOCUS )
+    {
+        m_scrollHelper->HandleOnChildFocus((wxChildFocusEvent &)event);
+        return true;
+    }
+
+    // reset the skipped flag (which might have been set to true in
+    // ProcessEvent() above) to be able to test it below
+    bool wasSkipped = event.GetSkipped();
+    if ( wasSkipped )
+        event.Skip(false);
+

     if ( evType == wxEVT_SCROLLWIN_TOP ||
          evType == wxEVT_SCROLLWIN_BOTTOM ||
          evType == wxEVT_SCROLLWIN_LINEUP ||
     if ( evType == wxEVT_SCROLLWIN_TOP ||
          evType == wxEVT_SCROLLWIN_BOTTOM ||
          evType == wxEVT_SCROLLWIN_LINEUP ||


@@ -254,8 +257,16 @@ bool wxScrollHelperEvtHandler::ProcessEvent(wxEvent& event)
          evType == wxEVT_SCROLLWIN_THUMBTRACK ||
          evType == wxEVT_SCROLLWIN_THUMBRELEASE )
     {
          evType == wxEVT_SCROLLWIN_THUMBTRACK ||
          evType == wxEVT_SCROLLWIN_THUMBRELEASE )
     {

-            m_scrollHelper->HandleOnScroll((wxScrollWinEvent &)event);
-            return !event.GetSkipped();
+        m_scrollHelper->HandleOnScroll((wxScrollWinEvent &)event);
+        if ( !event.GetSkipped() )
+        {
+            // it makes sense to indicate that we processed the message as we
+            // did scroll the window (and also notice that wxAutoScrollTimer
+            // relies on our return value to stop scrolling when we are at top
+            // or bottom already)
+            processed = true;
+            wasSkipped = false;
+        }

     }
 
     if ( evType == wxEVT_ENTER_WINDOW )
     }
 
     if ( evType == wxEVT_ENTER_WINDOW )


@@ -267,18 +278,29 @@ bool wxScrollHelperEvtHandler::ProcessEvent(wxEvent& event)
         m_scrollHelper->HandleOnMouseLeave((wxMouseEvent &)event);
     }
 #if wxUSE_MOUSEWHEEL
         m_scrollHelper->HandleOnMouseLeave((wxMouseEvent &)event);
     }
 #if wxUSE_MOUSEWHEEL

+    // Use GTK's own scroll wheel handling in GtkScrolledWindow
+#ifndef __WXGTK20__

     else if ( evType == wxEVT_MOUSEWHEEL )
     {
         m_scrollHelper->HandleOnMouseWheel((wxMouseEvent &)event);
     else if ( evType == wxEVT_MOUSEWHEEL )
     {
         m_scrollHelper->HandleOnMouseWheel((wxMouseEvent &)event);

+        return true;

     }
     }

+#endif

 #endif // wxUSE_MOUSEWHEEL
     else if ( evType == wxEVT_CHAR )
     {
         m_scrollHelper->HandleOnChar((wxKeyEvent &)event);
 #endif // wxUSE_MOUSEWHEEL
     else if ( evType == wxEVT_CHAR )
     {
         m_scrollHelper->HandleOnChar((wxKeyEvent &)event);

-        return !event.GetSkipped();
+        if ( !event.GetSkipped() )
+        {
+            processed = true;
+            wasSkipped = false;
+        }

     }
 
     }
 

-    return FALSE;
+    if ( processed )
+        event.Skip(wasSkipped);
+
+    return processed;

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


@@ -287,6 +309,8 @@ bool wxScrollHelperEvtHandler::ProcessEvent(wxEvent& event)
 
 wxScrollHelper::wxScrollHelper(wxWindow *win)
 {
 
 wxScrollHelper::wxScrollHelper(wxWindow *win)
 {

+    wxASSERT_MSG( win, _T("associated window can't be NULL in wxScrollHelper") );
+

     m_xScrollPixelsPerLine =
     m_yScrollPixelsPerLine =
     m_xScrollPosition =
     m_xScrollPixelsPerLine =
     m_yScrollPixelsPerLine =
     m_xScrollPosition =


@@ -297,7 +321,7 @@ 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;


@@ -312,8 +336,12 @@ wxScrollHelper::wxScrollHelper(wxWindow *win)
 
     m_handler = NULL;
 
 
     m_handler = NULL;
 

-    if ( win )
-        SetWindow(win);
+    m_win = win;
+    
+    m_win->SetScrollHelper( this );
+
+    // by default, the associated window is also the target window
+    DoSetTargetWindow(win);

 }
 
 wxScrollHelper::~wxScrollHelper()
 }
 
 wxScrollHelper::~wxScrollHelper()


@@ -360,15 +388,18 @@ void wxScrollHelper::SetScrollbars(int pixelsPerUnitX,
     // For better backward compatibility we set persisting limits
     // here not just the size.  It makes SetScrollbars 'sticky'
     // emulating the old non-autoscroll behaviour.
     // 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 );
+    //   m_targetWindow->SetVirtualSizeHints( w, h );

 
     // The above should arguably be deprecated, this however we still need.
 
 
     // The above should arguably be deprecated, this however we still need.
 

-    m_targetWindow->SetVirtualSize( w, h );
+    // 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)
 
     if (do_refresh && !noRefresh)

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

 
 #ifndef __WXUNIVERSAL__
     // If the target is not the same as the window with the scrollbars,
 
 #ifndef __WXUNIVERSAL__
     // If the target is not the same as the window with the scrollbars,


@@ -383,9 +414,6 @@ void wxScrollHelper::SetScrollbars(int pixelsPerUnitX,
     else
     {
         // otherwise this has been done by AdjustScrollbars, above
     else
     {
         // otherwise this has been done by AdjustScrollbars, above

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

     }
 #endif // !__WXUNIVERSAL__
 }
     }
 #endif // !__WXUNIVERSAL__
 }


@@ -410,19 +438,18 @@ void wxScrollHelper::DeleteEvtHandler()
     }
 }
 
     }
 }
 

-void wxScrollHelper::SetWindow(wxWindow *win)
+void wxScrollHelper::ResetDrawnFlag()

 {
 {

-    wxCHECK_RET( win, _T("wxScrollHelper needs a window to scroll") );
-
-    m_win = win;
-
-    // by default, the associated window is also the target window
-    DoSetTargetWindow(win);
+    wxCHECK_RET( m_handler, "invalid use of ResetDrawnFlag - no handler?" );
+    m_handler->ResetDrawnFlag();

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

+#ifdef __WXMAC__
+    target->MacSetClipChildren( true ) ;
+#endif

 
     // 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
 
     // 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


@@ -467,21 +494,10 @@ void wxScrollHelper::HandleOnScroll(wxScrollWinEvent& event)
         return;
     }
 
         return;
     }
 

-    int orient = event.GetOrientation();
-    if (orient == wxHORIZONTAL)
-    {
-        m_xScrollPosition += nScrollInc;
-        m_win->SetScrollPos(wxHORIZONTAL, m_xScrollPosition);
-    }
-    else
-    {
-        m_yScrollPosition += nScrollInc;
-        m_win->SetScrollPos(wxVERTICAL, m_yScrollPosition);
-    }
-
-    bool needsRefresh = FALSE;
+    bool needsRefresh = false;

     int dx = 0,
         dy = 0;
     int dx = 0,
         dy = 0;

+    int orient = event.GetOrientation();

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


@@ -490,7 +506,7 @@ void wxScrollHelper::HandleOnScroll(wxScrollWinEvent& event)
        }
        else
        {
        }
        else
        {

-           needsRefresh = TRUE;
+           needsRefresh = true;

        }
     }
     else
        }
     }
     else


@@ -501,22 +517,42 @@ void wxScrollHelper::HandleOnScroll(wxScrollWinEvent& event)
         }
         else
         {
         }
         else
         {

-            needsRefresh = TRUE;
+            needsRefresh = true;

         }
     }
 
         }
     }
 

+    if ( !needsRefresh )
+    {
+        // flush all pending repaints before we change m_{x,y}ScrollPosition, as
+        // otherwise invalidated area could be updated incorrectly later when
+        // ScrollWindow() makes sure they're repainted before scrolling them
+#ifdef __WXMAC__
+        // wxWindowMac is taking care of making sure the update area is correctly
+        // set up, while not forcing an immediate redraw
+#else
+        m_targetWindow->Update();
+#endif
+    }
+
+    if (orient == wxHORIZONTAL)
+    {
+        m_xScrollPosition += nScrollInc;
+        m_win->SetScrollPos(wxHORIZONTAL, m_xScrollPosition);
+    }
+    else
+    {
+        m_yScrollPosition += nScrollInc;
+        m_win->SetScrollPos(wxVERTICAL, m_yScrollPosition);
+    }
+

     if ( needsRefresh )
     {
     if ( needsRefresh )
     {

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

     }
     else
     {
         m_targetWindow->ScrollWindow(dx, dy, GetScrollRect());
     }
     }
     else
     {
         m_targetWindow->ScrollWindow(dx, dy, GetScrollRect());
     }

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

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


@@ -572,54 +608,97 @@ int wxScrollHelper::CalcScrollInc(wxScrollWinEvent& event)
 
     if (orient == wxHORIZONTAL)
     {
 
     if (orient == wxHORIZONTAL)
     {

-        if (m_xScrollPixelsPerLine > 0)
+        if ( m_xScrollPosition + nScrollInc < 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
+            // As -ve as we can go
+            nScrollInc = -m_xScrollPosition;

         }
         }

-        else
-            m_targetWindow->Refresh(TRUE, GetScrollRect());
-    }
-    else
-    {
-        if ( m_yScrollPixelsPerLine > 0 )
+        else // check for the other bound

         {
         {

-            if ( m_yScrollPosition + nScrollInc < 0 )
+            const int posMax = m_xScrollLines - m_xScrollLinesPerPage;
+            if ( m_xScrollPosition + nScrollInc > posMax )

             {
             {

-                // As -ve as we can go
-                nScrollInc = -m_yScrollPosition;
+                // As +ve as we can go
+                nScrollInc = posMax - m_xScrollPosition;

             }
             }

-            else // check for the other bound
+        }
+    }
+    else // wxVERTICAL
+    {
+        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 )

             {
             {

-                const int posMax = m_yScrollLines - m_yScrollLinesPerPage;
-                if ( m_yScrollPosition + nScrollInc > posMax )
-                {
-                    // As +ve as we can go
-                    nScrollInc = posMax - m_yScrollPosition;
-                }
+                // As +ve as we can go
+                nScrollInc = posMax - m_yScrollPosition;

             }
         }
             }
         }

-        else
+    }
+
+    return nScrollInc;
+}
+
+void
+wxScrollHelper::AdjustScrollbar(int orient,
+                                int clientSize,
+                                int virtSize,
+                                int& pixelsPerUnit,
+                                int& scrollUnits,
+                                int& scrollPosition)
+{
+    // scroll lines per page: if 0, no scrolling is needed
+    int unitsPerPage;
+
+    // check if we need scrollbar in this direction at all
+    if ( pixelsPerUnit == 0 || clientSize >= virtSize )
+    {
+        // scrolling is disabled or unnecessary
+        scrollUnits =
+        scrollPosition = 0;
+        unitsPerPage = 0;
+    }
+    else // might need scrolling
+    {
+        // Round up integer division to catch any "leftover" client space.
+        scrollUnits = (virtSize + pixelsPerUnit - 1) / pixelsPerUnit;
+
+        // Calculate the number of fully scroll units
+        unitsPerPage = clientSize / pixelsPerUnit;
+
+        if (unitsPerPage >= scrollUnits)
+        {
+            // we're big enough to not need scrolling
+            scrollUnits =
+            scrollPosition = 0;
+            unitsPerPage = 0;
+        }
+        else // we do need a scrollbar

         {
         {

-            // VZ: why do we do this? (FIXME)
-            m_targetWindow->Refresh(TRUE, GetScrollRect());
+            if ( unitsPerPage < 1 )
+                unitsPerPage = 1;
+
+            // Correct position if greater than extent of canvas minus
+            // the visible portion of it or if below zero
+            const int posMax = scrollUnits - unitsPerPage;
+            if ( scrollPosition > posMax )
+                scrollPosition = posMax;
+            else if ( scrollPosition < 0 )
+                scrollPosition = 0;

         }
     }
 
         }
     }
 

-    return nScrollInc;
+    m_win->SetScrollbar(orient, scrollPosition, unitsPerPage, scrollUnits);
+
+    // The amount by which we scroll when paging
+    SetScrollPageSize(orient, unitsPerPage);

 }
 
 }
 

-// Adjust the scrollbars - new version.

 void wxScrollHelper::AdjustScrollbars()
 {
     static wxRecursionGuardFlag s_flagReentrancy;
 void wxScrollHelper::AdjustScrollbars()
 {
     static wxRecursionGuardFlag s_flagReentrancy;


@@ -635,108 +714,62 @@ void wxScrollHelper::AdjustScrollbars()
         return;
     }
 
         return;
     }
 

-#ifdef __WXMAC__
-    m_targetWindow->Update();
-#endif
-
-    int w = 0, h = 0;
-    int oldw, oldh;
-

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

-    // 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
+    // we may need to readjust the scrollbars several times as enabling one of
+    // them reduces the area available for the window contents and so can make
+    // the other scrollbar necessary now although it wasn't necessary before
+    //
+    // VZ: normally this loop should be over in at most 2 iterations, I don't
+    //     know why do we need 5 of them
+    for ( int iterationCount = 0; iterationCount < 5; iterationCount++ )

     {
     {

-        GetTargetSize(&w, 0);
-
-        if (m_xScrollPixelsPerLine == 0)
-        {
-            m_xScrollLines = 0;
-            m_xScrollPosition = 0;
-            m_win->SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);
-        }
-        else
+        wxSize clientSize = GetTargetSize();
+        const wxSize virtSize = m_targetWindow->GetVirtualSize();
+
+        // this block of code tries to work around the following problem: the
+        // window could have been just resized to have enough space to show its
+        // full contents without the scrollbars, but its client size could be
+        // not big enough because it does have the scrollbars right now and so
+        // the scrollbars would remain even though we don't need them any more
+        //
+        // to prevent this from happening, check if we have enough space for
+        // everything without the scrollbars and explicitly disable them then
+        const wxSize availSize = GetSizeAvailableForScrollTarget(
+            m_win->GetSize() - m_win->GetWindowBorderSize());
+        if ( availSize != clientSize )

         {
         {

-            m_xScrollLines = m_targetWindow->GetVirtualSize().GetWidth() / m_xScrollPixelsPerLine;
-
-            // 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;
-
-            // 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 );
-
-            m_win->SetScrollbar(wxHORIZONTAL, m_xScrollPosition, noPagePositions, m_xScrollLines);
-            // The amount by which we scroll when paging
-            SetScrollPageSize(wxHORIZONTAL, noPagePositions);
-        }
-
-        GetTargetSize(0, &h);
-
-        // scroll lines per page: if 0, no scrolling is needed
-        int linesPerPage;
-
-        if ( m_yScrollPixelsPerLine == 0 )
-        {
-            // scrolling is disabled
-            m_yScrollLines = 0;
-            m_yScrollPosition = 0;
-            linesPerPage = 0;
-        }
-        else // might need scrolling
-        {
-            int hVirt = m_targetWindow->GetVirtualSize().GetHeight();
-            m_yScrollLines = hVirt / m_yScrollPixelsPerLine;
-
-            // Calculate page size i.e. number of scroll units you get on the
-            // current client window
-            linesPerPage = h / m_yScrollPixelsPerLine;
-            if ( linesPerPage >= m_yScrollLines )
+            if ( availSize.x >= virtSize.x && availSize.y >= virtSize.y )

             {
             {

-                // 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;
+                // this will be enough to make the scrollbars disappear below
+                // and then the client size will indeed become equal to the
+                // full available size
+                clientSize = availSize;

             }
         }
 
             }
         }
 

-        m_win->SetScrollbar(wxVERTICAL, m_yScrollPosition,
-                            linesPerPage, m_yScrollLines);

 
 

-        // The amount by which we scroll when paging
-        SetScrollPageSize(wxVERTICAL, linesPerPage);
+        AdjustScrollbar(wxHORIZONTAL,
+                        clientSize.x,
+                        virtSize.x,
+                        m_xScrollPixelsPerLine,
+                        m_xScrollLines,
+                        m_xScrollPosition);

 
 

+        AdjustScrollbar(wxVERTICAL,
+                        clientSize.y,
+                        virtSize.y,
+                        m_yScrollPixelsPerLine,
+                        m_yScrollLines,
+                        m_yScrollPosition);

 
 

-        // 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 );
+        // If a scrollbar (dis)appeared as a result of this, we need to adjust
+        // them again but if the client size didn't change, then we're done
+        if ( GetTargetSize() == clientSize )
+            break;
+    }

 
 #ifdef __WXMOTIF__
     // Sorry, some Motif-specific code to implement a backing pixmap
 
 #ifdef __WXMOTIF__
     // Sorry, some Motif-specific code to implement a backing pixmap


@@ -777,7 +810,7 @@ void wxScrollHelper::AdjustScrollbars()
             m_targetWindow->ScrollWindow( m_xScrollPixelsPerLine * (oldXScroll - m_xScrollPosition), 0,
                                           GetScrollRect() );
        else
             m_targetWindow->ScrollWindow( m_xScrollPixelsPerLine * (oldXScroll - m_xScrollPosition), 0,
                                           GetScrollRect() );
        else

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

     }
 
     if (oldYScroll != m_yScrollPosition)
     }
 
     if (oldYScroll != m_yScrollPosition)


@@ -786,19 +819,24 @@ void wxScrollHelper::AdjustScrollbars()
             m_targetWindow->ScrollWindow( 0, m_yScrollPixelsPerLine * (oldYScroll-m_yScrollPosition),
                                           GetScrollRect() );
         else
             m_targetWindow->ScrollWindow( 0, m_yScrollPixelsPerLine * (oldYScroll-m_yScrollPosition),
                                           GetScrollRect() );
         else

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

     }
     }

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

 }
 
 void wxScrollHelper::DoPrepareDC(wxDC& dc)
 {
     wxPoint pt = dc.GetDeviceOrigin();
 }
 
 void wxScrollHelper::DoPrepareDC(wxDC& dc)
 {
     wxPoint pt = dc.GetDeviceOrigin();

-    dc.SetDeviceOrigin( pt.x - m_xScrollPosition * m_xScrollPixelsPerLine,
-                        pt.y - m_yScrollPosition * m_yScrollPixelsPerLine );
+#ifdef __WXGTK__
+    // It may actually be correct to always query
+    // the m_sign from the DC here, but I leave the
+    // #ifdef GTK for now.
+    if (m_win->GetLayoutDirection() == wxLayout_RightToLeft)
+        dc.SetDeviceOrigin( pt.x + m_xScrollPosition * m_xScrollPixelsPerLine,
+                            pt.y - m_yScrollPosition * m_yScrollPixelsPerLine );
+    else
+#endif
+        dc.SetDeviceOrigin( pt.x - m_xScrollPosition * m_xScrollPixelsPerLine,
+                            pt.y - m_yScrollPosition * m_yScrollPixelsPerLine );

     dc.SetUserScale( m_scaleX, m_scaleY );
 }
 
     dc.SetUserScale( m_scaleX, m_scaleY );
 }
 


@@ -828,6 +866,15 @@ void wxScrollHelper::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
         *y_unit = m_yScrollPixelsPerLine;
 }
 
         *y_unit = m_yScrollPixelsPerLine;
 }
 

+
+int wxScrollHelper::GetScrollLines( int orient ) const
+{
+    if ( orient == wxHORIZONTAL )
+        return m_xScrollLines;
+    else
+        return m_yScrollLines;
+}
+

 int wxScrollHelper::GetScrollPageSize(int orient) const
 {
     if ( orient == wxHORIZONTAL )
 int wxScrollHelper::GetScrollPageSize(int orient) const
 {
     if ( orient == wxHORIZONTAL )


@@ -855,60 +902,68 @@ 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->Update();
-#endif
-
-    int w, h;
+    int w = 0, h = 0;

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

+    // compute new position:
+    int new_x = m_xScrollPosition;
+    int new_y = m_yScrollPosition;
+

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

-        int old_x = m_xScrollPosition;
-        m_xScrollPosition = x_pos;
+        new_x = x_pos;

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

         if (noPagePositions < 1) noPagePositions = 1;
 
         // Correct position if greater than extent of canvas minus
         // the visible portion of it or if below zero
         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_win->SetScrollPos( wxHORIZONTAL, m_xScrollPosition );
-            m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0,
-                                          GetScrollRect() );
-        }
+        new_x = wxMin( m_xScrollLines-noPagePositions, new_x );
+        new_x = wxMax( 0, new_x );

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

-        int old_y = m_yScrollPosition;
-        m_yScrollPosition = y_pos;
+        new_y = y_pos;

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

         if (noPagePositions < 1) noPagePositions = 1;
 
         // Correct position if greater than extent of canvas minus
         // the visible portion of it or if below zero
         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_win->SetScrollPos( wxVERTICAL, m_yScrollPosition );
-            m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine,
-                                          GetScrollRect() );
-        }
+        new_y = wxMin( m_yScrollLines-noPagePositions, new_y );
+        new_y = wxMax( 0, new_y );

     }
 
     }
 

-#ifdef __WXMAC__
+    if ( new_x == m_xScrollPosition && new_y == m_yScrollPosition )
+        return; // nothing to do, the position didn't change
+
+    // flush all pending repaints before we change m_{x,y}ScrollPosition, as
+    // otherwise invalidated area could be updated incorrectly later when
+    // ScrollWindow() makes sure they're repainted before scrolling them

     m_targetWindow->Update();
     m_targetWindow->Update();

-#endif

 
 

+    // update the position and scroll the window now:
+    if (m_xScrollPosition != new_x)
+    {
+        int old_x = m_xScrollPosition;
+        m_xScrollPosition = new_x;
+        m_win->SetScrollPos( wxHORIZONTAL, new_x );
+        m_targetWindow->ScrollWindow( (old_x-new_x)*m_xScrollPixelsPerLine, 0,
+                                      GetScrollRect() );
+    }
+
+    if (m_yScrollPosition != new_y)
+    {
+        int old_y = m_yScrollPosition;
+        m_yScrollPosition = new_y;
+        m_win->SetScrollPos( wxVERTICAL, new_y );
+        m_targetWindow->ScrollWindow( 0, (old_y-new_y)*m_yScrollPixelsPerLine,
+                                      GetScrollRect() );
+    }

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


@@ -942,6 +997,48 @@ void wxScrollHelper::DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) co
         *yy = y + m_yScrollPosition * m_yScrollPixelsPerLine;
 }
 
         *yy = y + m_yScrollPosition * m_yScrollPixelsPerLine;
 }
 

+// ----------------------------------------------------------------------------
+// geometry
+// ----------------------------------------------------------------------------
+
+bool wxScrollHelper::ScrollLayout()
+{
+    if ( m_win->GetSizer() && m_targetWindow == m_win )
+    {
+        // If we're the scroll target, take into account the
+        // virtual size and scrolled position of the window.
+
+        int x = 0, y = 0, w = 0, h = 0;
+        CalcScrolledPosition(0,0, &x,&y);
+        m_win->GetVirtualSize(&w, &h);
+        m_win->GetSizer()->SetDimension(x, y, w, h);
+        return true;
+    }
+
+    // fall back to default for LayoutConstraints
+    return m_win->wxWindow::Layout();
+}
+
+void wxScrollHelper::ScrollDoSetVirtualSize(int x, int y)
+{
+    m_win->wxWindow::DoSetVirtualSize( x, y );
+    AdjustScrollbars();
+
+    if (m_win->GetAutoLayout())
+        m_win->Layout();
+}
+
+// wxWindow's GetBestVirtualSize returns the actual window size,
+// whereas we want to return the virtual size
+wxSize wxScrollHelper::ScrollGetBestVirtualSize() const
+{
+    wxSize clientSize(m_win->GetClientSize());
+    if ( m_win->GetSizer() )
+        clientSize.IncTo(m_win->GetSizer()->CalcMin());
+
+    return clientSize;
+}
+

 // ----------------------------------------------------------------------------
 // event handlers
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // event handlers
 // ----------------------------------------------------------------------------


@@ -949,22 +1046,17 @@ void wxScrollHelper::DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) co
 // 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( m_win->GetAutoLayout() || m_targetWindow->GetAutoLayout() )
+    if ( m_targetWindow->GetAutoLayout() )

     {
     {

-        if ( m_targetWindow != m_win )
-            m_targetWindow->FitInside();
-
-        m_win->FitInside();
+        wxSize size = m_targetWindow->GetBestVirtualSize();

 
 

-        // FIXME:  Something is really weird here...  This should be
-        // called by FitInside above (and apparently is), yet the
-        // scrollsub sample will get the scrollbar wrong if resized
-        // quickly.  This masks the bug, but is surely not the right
-        // answer at all.
-        AdjustScrollbars();
+        // This will call ::Layout() and ::AdjustScrollbars()
+        m_win->SetVirtualSize( size );

     }
     else
     }
     else

+    {

         AdjustScrollbars();
         AdjustScrollbars();

+    }

 }
 
 // This calls OnDraw, having adjusted the origin according to the current
 }
 
 // This calls OnDraw, having adjusted the origin according to the current


@@ -984,9 +1076,9 @@ void wxScrollHelper::HandleOnPaint(wxPaintEvent& WXUNUSED(event))
 // this they always have the priority
 void wxScrollHelper::HandleOnChar(wxKeyEvent& event)
 {
 // this they always have the priority
 void wxScrollHelper::HandleOnChar(wxKeyEvent& event)
 {

-    int stx, sty,       // view origin
-        szx, szy,       // view size (total)
-        clix, cliy;     // view size (on screen)
+    int stx = 0, sty = 0,       // view origin
+        szx = 0, szy = 0,       // view size (total)
+        clix = 0, cliy = 0;     // view size (on screen)

 
     GetViewStart(&stx, &sty);
     GetTargetSize(&clix, &cliy);
 
     GetViewStart(&stx, &sty);
     GetTargetSize(&clix, &cliy);


@@ -1020,13 +1112,11 @@ void wxScrollHelper::HandleOnChar(wxKeyEvent& event)
     switch ( event.GetKeyCode() )
     {
         case WXK_PAGEUP:
     switch ( event.GetKeyCode() )
     {
         case WXK_PAGEUP:

-        case WXK_PRIOR:

             dsty = sty - (5 * cliy / 6);
             Scroll(-1, (dsty == -1) ? 0 : dsty);
             break;
 
         case WXK_PAGEDOWN:
             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;
 
             Scroll(-1, sty + (5 * cliy / 6));
             break;
 


@@ -1061,18 +1151,18 @@ void wxScrollHelper::HandleOnChar(wxKeyEvent& event)
 
     if ( m_xScrollPosition != xScrollOld )
     {
 
     if ( m_xScrollPosition != xScrollOld )
     {

-        wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, m_xScrollPosition,
+        wxScrollWinEvent evt(wxEVT_SCROLLWIN_THUMBTRACK, m_xScrollPosition,

                                wxHORIZONTAL);
                                wxHORIZONTAL);

-        event.SetEventObject(m_win);
-        m_win->GetEventHandler()->ProcessEvent(event);
+        evt.SetEventObject(m_win);
+        m_win->GetEventHandler()->ProcessEvent(evt);

     }
 
     if ( m_yScrollPosition != yScrollOld )
     {
     }
 
     if ( m_yScrollPosition != yScrollOld )
     {

-        wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, m_yScrollPosition,
+        wxScrollWinEvent evt(wxEVT_SCROLLWIN_THUMBTRACK, m_yScrollPosition,

                                wxVERTICAL);
                                wxVERTICAL);

-        event.SetEventObject(m_win);
-        m_win->GetEventHandler()->ProcessEvent(event);
+        evt.SetEventObject(m_win);
+        m_win->GetEventHandler()->ProcessEvent(evt);

     }
 }
 
     }
 }
 


@@ -1169,6 +1259,8 @@ 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
     }
 }
 #endif
     }
 }


@@ -1187,15 +1279,15 @@ void wxScrollHelper::HandleOnMouseWheel(wxMouseEvent& event)
         wxScrollWinEvent newEvent;
 
         newEvent.SetPosition(0);
         wxScrollWinEvent newEvent;
 
         newEvent.SetPosition(0);

-        newEvent.SetOrientation(wxVERTICAL);
-        newEvent.m_eventObject = m_win;
+        newEvent.SetOrientation( event.GetWheelAxis() == 0 ? wxVERTICAL : wxHORIZONTAL);
+        newEvent.SetEventObject(m_win);

 
         if (event.IsPageScroll())
         {
             if (lines > 0)
 
         if (event.IsPageScroll())
         {
             if (lines > 0)

-                newEvent.m_eventType = wxEVT_SCROLLWIN_PAGEUP;
+                newEvent.SetEventType(wxEVT_SCROLLWIN_PAGEUP);

             else
             else

-                newEvent.m_eventType = wxEVT_SCROLLWIN_PAGEDOWN;
+                newEvent.SetEventType(wxEVT_SCROLLWIN_PAGEDOWN);

 
             m_win->GetEventHandler()->ProcessEvent(newEvent);
         }
 
             m_win->GetEventHandler()->ProcessEvent(newEvent);
         }


@@ -1203,9 +1295,9 @@ void wxScrollHelper::HandleOnMouseWheel(wxMouseEvent& event)
         {
             lines *= event.GetLinesPerAction();
             if (lines > 0)
         {
             lines *= event.GetLinesPerAction();
             if (lines > 0)

-                newEvent.m_eventType = wxEVT_SCROLLWIN_LINEUP;
+                newEvent.SetEventType(wxEVT_SCROLLWIN_LINEUP);

             else
             else

-                newEvent.m_eventType = wxEVT_SCROLLWIN_LINEDOWN;
+                newEvent.SetEventType(wxEVT_SCROLLWIN_LINEDOWN);

 
             int times = abs(lines);
             for (; times > 0; times--)
 
             int times = abs(lines);
             for (; times > 0; times--)


@@ -1216,80 +1308,177 @@ void wxScrollHelper::HandleOnMouseWheel(wxMouseEvent& event)
 
 #endif // wxUSE_MOUSEWHEEL
 
 
 #endif // wxUSE_MOUSEWHEEL
 

-// ----------------------------------------------------------------------------
-// wxGenericScrolledWindow implementation
-// ----------------------------------------------------------------------------
+void wxScrollHelper::HandleOnChildFocus(wxChildFocusEvent& event)
+{
+    // this event should be processed by all windows in parenthood chain,
+    // e.g. so that nested wxScrolledWindows work correctly
+    event.Skip();

 
 

-IMPLEMENT_DYNAMIC_CLASS(wxGenericScrolledWindow, wxPanel)
+    // find the immediate child under which the window receiving focus is:
+    wxWindow *win = event.GetWindow();

 
 

-BEGIN_EVENT_TABLE(wxGenericScrolledWindow, wxPanel)
-    EVT_PAINT(wxGenericScrolledWindow::OnPaint)
-END_EVENT_TABLE()
+    if ( win == m_targetWindow )
+        return; // nothing to do

 
 

-bool wxGenericScrolledWindow::Create(wxWindow *parent,
-                              wxWindowID id,
-                              const wxPoint& pos,
-                              const wxSize& size,
-                              long style,
-                              const wxString& name)
-{
-    m_targetWindow = this;
+#ifdef __WXMAC__
+    if (wxDynamicCast(win, wxScrollBar))
+        return;
+#endif

 
 

-    bool ok = wxPanel::Create(parent, id, pos, size, style, name);
+    // Fixing ticket: http://trac.wxwidgets.org/ticket/9563
+    // When a child inside a wxControlContainer receives a focus, the
+    // wxControlContainer generates an artificial wxChildFocusEvent for
+    // itself, telling its parent that 'it' received the focus. The effect is
+    // that this->HandleOnChildFocus is called twice, first with the
+    // artificial wxChildFocusEvent and then with the original event.  We need
+    // to ignore the artificial event here or otherwise HandleOnChildFocus
+    // would first scroll the target window to make the entire
+    // wxControlContainer visible and immediately afterwards scroll the target
+    // window again to make the child widget visible. This leads to ugly
+    // flickering when using nested wxPanels/wxScrolledWindows.
+    //
+    // Ignore this event if 'win' is derived from wxControlContainer AND its
+    // parent is the m_targetWindow AND 'win' is not actually reciving the
+    // focus (win != FindFocus).  TODO: This affects all wxControlContainer
+    // objects, but wxControlContainer is not part of the wxWidgets RTTI and
+    // so wxDynamicCast(win, wxControlContainer) does not compile.  Find a way
+    // to determine if 'win' derives from wxControlContainer. Until then,
+    // testing if 'win' derives from wxPanel will probably get >90% of all
+    // cases.
+
+    wxWindow *actual_focus=wxWindow::FindFocus();
+    if (win != actual_focus &&
+        wxDynamicCast(win, wxPanel) != 0 &&
+        win->GetParent() == m_targetWindow)
+        // if win is a wxPanel and receives the focus, it should not be
+        // scrolled into view
+        return; 
+
+    wxSize view(m_targetWindow->GetClientSize());
+
+    // For composite controls such as wxComboCtrl we should try to fit the
+    // entire control inside the visible area of the target window, not just
+    // the focused child of the control. Otherwise we'd make only the textctrl
+    // part of a wxComboCtrl visible and the button would still be outside the
+    // scrolled area.  But do so only if the parent fits *entirely* inside the
+    // scrolled window. In other situations, such as nested wxPanel or
+    // wxScrolledWindows, the parent might be way to big to fit inside the
+    // scrolled window. If that is the case, then make only the focused window
+    // visible
+    if ( win->GetParent() != m_targetWindow)
+    {
+        wxWindow *parent=win->GetParent();
+        wxSize parent_size=parent->GetSize();
+        if (parent_size.GetWidth() <= view.GetWidth() &&
+            parent_size.GetHeight() <= view.GetHeight())
+            // make the immediate parent visible instead of the focused control
+            win=parent; 
+    }

 
 

-    return ok;
-}
+    // if the child is not fully visible, try to scroll it into view:
+    int stepx, stepy;
+    GetScrollPixelsPerUnit(&stepx, &stepy);

 
 

-wxGenericScrolledWindow::~wxGenericScrolledWindow()
-{
-}
+    // 'win' position coordinates are relative to it's parent
+    // convert them so that they are relative to the m_targetWindow viewing area
+    wxRect winrect(m_targetWindow->ScreenToClient(win->GetScreenPosition()),
+                   win->GetSize());

 
 

-bool wxGenericScrolledWindow::Layout()
-{
-    if (GetSizer() && m_targetWindow == this)
+    int startx, starty;
+    GetViewStart(&startx, &starty);
+
+    // first in vertical direction:
+    if ( stepy > 0 )

     {
     {

-        // If we're the scroll target, take into account the
-        // virtual size and scrolled position of the window.
+        int diff = 0;

 
 

-        int x, y, w, h;
-        CalcScrolledPosition(0,0, &x,&y);
-        GetVirtualSize(&w, &h);
-        GetSizer()->SetDimension(x, y, w, h);
-        return TRUE;
+        if ( winrect.GetTop() < 0 )
+        {
+            diff = winrect.GetTop();
+        }
+        else if ( winrect.GetBottom() > view.y )
+        {
+            diff = winrect.GetBottom() - view.y + 1;
+            // round up to next scroll step if we can't get exact position,
+            // so that the window is fully visible:
+            diff += stepy - 1;
+        }
+
+        starty = (starty * stepy + diff) / stepy;

     }
 
     }
 

-    // fall back to default for LayoutConstraints
-    return wxPanel::Layout();
-}
+    // then horizontal:
+    if ( stepx > 0 )
+    {
+        int diff = 0;

 
 

-void wxGenericScrolledWindow::DoSetVirtualSize(int x, int y)
-{
-    wxPanel::DoSetVirtualSize( x, y );
-    AdjustScrollbars();
+        if ( winrect.GetLeft() < 0 )
+        {
+            diff = winrect.GetLeft();
+        }
+        else if ( winrect.GetRight() > view.x )
+        {
+            diff = winrect.GetRight() - view.x + 1;
+            // round up to next scroll step if we can't get exact position,
+            // so that the window is fully visible:
+            diff += stepx - 1;
+        }

 
 

-#if wxUSE_CONSTRAINTS
-    if (GetAutoLayout())
-        Layout();
-#endif
+        startx = (startx * stepx + diff) / stepx;
+    }
+
+    Scroll(startx, starty);

 }
 
 }
 

-void wxGenericScrolledWindow::OnPaint(wxPaintEvent& event)
+// ----------------------------------------------------------------------------
+// wxScrolled<T> and wxScrolledWindow implementation
+// ----------------------------------------------------------------------------
+
+wxSize wxScrolledT_Helper::FilterBestSize(const wxWindow *win,
+                                          const wxScrollHelperNative *helper,
+                                          const wxSize& origBest)

 {
 {

-    // 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();
+    // NB: We don't do this in WX_FORWARD_TO_SCROLL_HELPER, because not
+    //     all scrollable windows should behave like this, only those that
+    //     contain children controls within scrollable area
+    //     (i.e., wxScrolledWindow) and other some scrollable windows may
+    //     have different DoGetBestSize() implementation (e.g. wxTreeCtrl).

 
 

-    event.Skip();
+    wxSize best = origBest;
+
+    if ( win->GetAutoLayout() )
+    {
+        // 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;
+        helper->GetScrollPixelsPerUnit(&ppuX, &ppuY);
+
+        // NB: This code used to use *current* size if min size wasn't
+        //     specified, presumably to get some reasonable (i.e., larger than
+        //     minimal) size.  But that's a wrong thing to do in GetBestSize(),
+        //     so we use minimal size as specified. If the app needs some
+        //     minimal size for its scrolled window, it should set it and put
+        //     the window into sizer as expandable so that it can use all space
+        //     available to it.
+        //
+        //     See also http://svn.wxwidgets.org/viewvc/wx?view=rev&revision=45864
+
+        wxSize minSize = win->GetMinSize();
+
+        if ( ppuX > 0 )
+            best.x = minSize.x + wxSystemSettings::GetMetric(wxSYS_VSCROLL_X);
+
+        if ( ppuY > 0 )
+            best.y = minSize.y + wxSystemSettings::GetMetric(wxSYS_HSCROLL_Y);
+    }
+
+    return best;

 }
 
 #ifdef __WXMSW__
 }
 
 #ifdef __WXMSW__

-long
-wxGenericScrolledWindow::MSWWindowProc(WXUINT nMsg,
-                                       WXWPARAM wParam,
-                                       WXLPARAM lParam)
+WXLRESULT wxScrolledT_Helper::FilterMSWWindowProc(WXUINT nMsg, WXLRESULT rc)

 {
 {

-    long rc = wxPanel::MSWWindowProc(nMsg, wParam, lParam);
-

 #ifndef __WXWINCE__
     // we need to process arrows ourselves for scrolling
     if ( nMsg == WM_GETDLGCODE )
 #ifndef __WXWINCE__
     // we need to process arrows ourselves for scrolling
     if ( nMsg == WM_GETDLGCODE )


@@ -1297,12 +1486,10 @@ wxGenericScrolledWindow::MSWWindowProc(WXUINT nMsg,
         rc |= DLGC_WANTARROWS;
     }
 #endif
         rc |= DLGC_WANTARROWS;
     }
 #endif

-

     return rc;
 }
     return rc;
 }

-

 #endif // __WXMSW__
 
 #endif // __WXMSW__
 

-#endif // !wxGTK
-
-// vi:sts=4:sw=4:et
+// NB: skipping wxScrolled<T> in wxRTTI information because being a templte,
+//     it doesn't and can't implement wxRTTI support
+IMPLEMENT_DYNAMIC_CLASS(wxScrolledWindow, wxPanel)