From 566d84a7c3c06956562b9f8ac364aa3bad760c10 Mon Sep 17 00:00:00 2001
From: Ron Lee <ron@debian.org>
Date: Fri, 19 Apr 2002 22:12:38 +0000
Subject: [PATCH] Added knowledge of virtual size to wx(Scrolled)Windows, they
 can now manage their own scrollbars with the help of a sizer or other user
 clues (SetVirtualSizeHints) without the need for an ancillary container.
 Added SetSizerAndFit convenience method. SetSizer now enables/disables
 AutoLayout automagically. Logic bugfix for scrollsub sample. Syntax bugfix in
 parser.y. Compiler warning fix in textctrl.cpp.

 Modified Files:
    docs/latex/wx/scrolwin.tex docs/latex/wx/sizer.tex
    docs/latex/wx/window.tex include/wx/scrolwin.h
    include/wx/sizer.h include/wx/window.h
    include/wx/generic/scrolwin.h include/wx/gtk/scrolwin.h
    samples/scrollsub/scrollsub.cpp src/common/parser.y
    src/common/sizer.cpp src/common/wincmn.cpp
    src/generic/scrlwing.cpp src/gtk/scrolwin.cpp
    src/msw/textctrl.cpp


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15210 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 docs/latex/wx/scrolwin.tex      |  13 +-
 docs/latex/wx/sizer.tex         |  33 ++++-
 docs/latex/wx/window.tex        |  62 +++++++-
 include/wx/generic/scrolwin.h   |   4 +
 include/wx/gtk/scrolwin.h       |  21 ++-
 include/wx/gtk1/scrolwin.h      |  21 ++-
 include/wx/scrolwin.h           |   8 +-
 include/wx/sizer.h              |   7 +-
 include/wx/window.h             |  43 +++++-
 samples/scrollsub/scrollsub.cpp |  26 +++-
 src/common/parser.y             |   1 +
 src/common/sizer.cpp            |  65 ++++++++-
 src/common/wincmn.cpp           |  51 ++++++-
 src/generic/scrlwing.cpp        | 247 ++++++++++++++++++--------------
 src/gtk/scrolwin.cpp            | 149 +++++++++----------
 src/gtk1/scrolwin.cpp           | 149 +++++++++----------
 src/msw/textctrl.cpp            |   4 +-
 17 files changed, 598 insertions(+), 306 deletions(-)

diff --git a/docs/latex/wx/scrolwin.tex b/docs/latex/wx/scrolwin.tex
index 0129bee043..f71a9789ba 100644
--- a/docs/latex/wx/scrolwin.tex
+++ b/docs/latex/wx/scrolwin.tex
@@ -358,11 +358,22 @@ scroll steps may be variable according to the position in the document, it will
 necessary to derive a new class from wxWindow, overriding {\bf OnSize} and
 adjusting the scrollbars appropriately.
 
+\wxheading{See also}
+
+\helpref{wxWindow::SetVirtualSize}{wxwindowsetvirtualsize}
+
+\membersection{wxScrolledWindow::SetScrollRate}\label{wxscrolledwindowsetscrollrate}
+
+\func{void}{SetScrollRate}{\param{int}{xstep}, \param{int}{ystep}}
+
+Set the horizontal and vertical scrolling increment only.  See the pixelsPerUnit
+parameter in SetScrollbars.
+
 \membersection{wxScrolledWindow::SetTargetWindow}\label{wxscrolledwindowsettargetwindow}
 
 \func{void}{SetTargetWindow}{\param{wxWindow* }{window}}
 
-Call this function to tell wxScrolledWindow to perform the actually scrolling on
+Call this function to tell wxScrolledWindow to perform the actual scrolling on
 a different window (not on itself).
 
 \membersection{wxScrolledWindow::GetViewStart}\label{wxscrolledwindowgetviewstart}
diff --git a/docs/latex/wx/sizer.tex b/docs/latex/wx/sizer.tex
index f39b4aeabc..86cf483ab0 100644
--- a/docs/latex/wx/sizer.tex
+++ b/docs/latex/wx/sizer.tex
@@ -131,6 +131,20 @@ Tell the sizer to resize the {\it window} to match the sizer's minimal size. Thi
 is commonly done in the constructor of the window itself, see sample in the description
 of \helpref{wxBoxSizer}{wxboxsizer}.
 
+\membersection{wxSizer::FitInside}\label{wxsizerfitinside}
+
+\func{void}{FitInside}{\param{wxWindow* }{window}}
+
+Tell the sizer to resize the virtual size of the {\it window} to match the sizer's
+minimal size.  This will not alter the on screen size of the window, but may cause
+the addition/removal/alteration of scrollbars required to view the virtual area in
+windows which manage it.
+
+\wxheading{See also}
+
+\helpref{wxScrolledWindow::SetScrollbars}{wxscrolledwindowsetscrollbars},\rtfsp
+\helpref{wxSizer::SetVirtualSizeHints}{wxsizersetvirtualsizehints}
+
 \membersection{wxSizer::GetSize}\label{wxsizergetsize}
 
 \func{wxSize}{GetSize}{\void}
@@ -230,8 +244,19 @@ after initial creation.
 
 \func{void}{SetSizeHints}{\param{wxWindow* }{window}}
 
-Tell the sizer to set the minimal size of the {\it window} to match the sizer's minimal size.
-This is commonly done in the constructor of the window itself, see sample in the description
-of \helpref{wxBoxSizer}{wxboxsizer} if the window is resizable (as are many dialogs under Unix and
-frames on probably all platforms).
+Tell the sizer to set (and \helpref{Fit}{wxsizerfit}) the minimal size of the {\it window} to
+match the sizer's minimal size.  This is commonly done in the constructor of the window itself,
+see sample in the description of \helpref{wxBoxSizer}{wxboxsizer} if the window is resizable
+(as are many dialogs under Unix and frames on probably all platforms).
+
+\membersection{wxSizer::SetVirtualSizeHints}\label{wxsizersetvirtualsizehints}
+
+\func{void}{SetVirtualSizeHints}{\param{wxWindow* }{window}}
+
+Tell the sizer to set the minimal size of the {\it window} virtual area to match the sizer's
+minimal size.  For windows with managed scrollbars this will set them appropriately.
+
+\wxheading{See also}
+
+\helpref{wxScrolledWindow::SetScrollbars}{wxscrolledwindowsetscrollbars}
 
diff --git a/docs/latex/wx/window.tex b/docs/latex/wx/window.tex
index c5846f1cd0..4294d874f6 100644
--- a/docs/latex/wx/window.tex
+++ b/docs/latex/wx/window.tex
@@ -570,6 +570,7 @@ implements the following methods:\par
 \wxheading{See also}
 
 \helpref{GetSize}{wxwindowgetsize}
+\helpref{GetVirtualSize}{wxwindowgetvirtualsize}
 
 \membersection{wxWindow::GetConstraints}\label{wxwindowgetconstraints}
 
@@ -826,7 +827,8 @@ method:\par
 
 \wxheading{See also}
 
-\helpref{GetClientSize}{wxwindowgetclientsize}
+\helpref{GetClientSize}{wxwindowgetclientsize},\rtfsp
+\helpref{GetVirtualSize}{wxwindowgetvirtualsize}
 
 \membersection{wxWindow::GetSizer}\label{wxwindowgetsizer}
 
@@ -902,6 +904,23 @@ only be called within an \helpref{wxPaintEvent}{wxpaintevent} handler.
 
 Returns a pointer to the current validator for the window, or NULL if there is none.
 
+\membersection{wxWindow::GetVirtualSize}\label{wxwindowgetvirtualsize}
+
+\constfunc{void}{GetVirtualSize}{\param{int* }{width}, \param{int* }{height}}
+
+\constfunc{wxSize}{GetVirtualSize}{\void}
+
+This gets the virtual size of the window in pixels.
+
+\wxheading{Parameters}
+
+\docparam{width}{Receives the window virtual width.}
+
+\docparam{height}{Receives the window virtual height.}
+
+\helpref{GetSize}{wxwindowgetsize},\rtfsp
+\helpref{GetClientSize}{wxwindowgetclientsize}
+
 \membersection{wxWindow::GetWindowStyleFlag}\label{wxwindowgetwindowstyleflag}
 
 \constfunc{long}{GetWindowStyleFlag}{\void}
@@ -2405,11 +2424,21 @@ Pass FALSE if you wish to handle deleting the old sizer yourself.}
 
 \wxheading{Remarks}
 
+SetSizer now enables and disables Layout automatically, but prior to wxWindows 2.3.3
+the following applied:
+
 You must call \helpref{wxWindow::SetAutoLayout}{wxwindowsetautolayout} to tell a window to use
 the sizer automatically in OnSize; otherwise, you must override OnSize and call Layout()
 explicitly. When setting both a wxSizer and a \helpref{wxLayoutConstraints}{wxlayoutconstraints},
 only the sizer will have effect.
 
+\membersection{wxWindow::SetSizerAndFit}\label{wxwindowsetsizerandfit}
+
+\func{void}{SetSizerAndFit}{\param{wxSizer* }{sizer}, \param{bool }{deleteOld=TRUE}}
+
+The same as \helpref{SetSizer}{wxwindowsetsizer}, except it also sets the size hints
+for the window based on the sizer's minimum size.
+
 \membersection{wxWindow::SetTitle}\label{wxwindowsettitle}
 
 \func{virtual void}{SetTitle}{\param{const wxString\& }{title}}
@@ -2450,6 +2479,37 @@ See also: \helpref{GetToolTip}{wxwindowgettooltip},
 Get the associated tooltip or NULL if none.
 
 
+\membersection{wxWindow::SetVirtualSize}\label{wxwindowsetvirtualsize}
+
+\func{void}{SetVirtualSize}{\param{int}{ width}, \param{int}{ height}}
+
+\func{void}{SetVirtualSize}{\param{const wxSize\&}{ size}}
+
+Sets the virtual size of the window in pixels.
+
+
+\membersection{wxWindow::SetVirtualSizeHints}\label{wxwindowsetvirtualsizehints}
+
+\func{virtual void}{SetVirtualSizeHints}{\param{int}{ minW},\param{int}{ minH}, \param{int}{ maxW=-1}, \param{int}{ maxH=-1}}
+
+Allows specification of minimum and maximum virtual window sizes.
+If a pair of values is not set (or set to -1), the default values
+will be used.
+
+\wxheading{Parameters}
+
+\docparam{minW}{Specifies the minimum width allowable.}
+
+\docparam{minH}{Specifies the minimum height allowable.}
+
+\docparam{maxW}{Specifies the maximum width allowable.}
+
+\docparam{maxH}{Specifies the maximum height allowable.}
+
+\wxheading{Remarks}
+
+If this function is called, the user will not be able to size the virtual area
+of the window outside the given bounds.
 
 \membersection{wxWindow::SetWindowStyle}\label{wxwindowsetwindowstyle}
 
diff --git a/include/wx/generic/scrolwin.h b/include/wx/generic/scrolwin.h
index 0808cbb2b3..acf05c500b 100644
--- a/include/wx/generic/scrolwin.h
+++ b/include/wx/generic/scrolwin.h
@@ -69,6 +69,8 @@ public:
         // lay out the window and its children
     virtual bool Layout();
 
+    virtual void DoSetVirtualSize( int x, int y );
+
 protected:
     // this is needed for wxEVT_PAINT processing hack described in
     // wxScrollHelperEvtHandler::ProcessEvent()
@@ -91,3 +93,5 @@ private:
 
 #endif
     // _WX_GENERIC_SCROLLWIN_H_
+
+// vi:sts=4:sw=4:et
diff --git a/include/wx/gtk/scrolwin.h b/include/wx/gtk/scrolwin.h
index 9d9c0d9a6e..ad017649b2 100644
--- a/include/wx/gtk/scrolwin.h
+++ b/include/wx/gtk/scrolwin.h
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        wx/generic/scrolwin.h
+// Name:        wx/gtk/scrolwin.h
 // Purpose:     wxScrolledWindow class
 // Author:      Robert Roebling
 // Modified by:
@@ -65,9 +65,17 @@ public:
     virtual void SetTargetWindow( wxWindow *target, bool pushEventHandler = FALSE );
     virtual wxWindow *GetTargetWindow();
 
+    // Set the scrolled area of the window.
+    virtual void DoSetVirtualSize( int x, int y );
+
+    // Set the x, y scrolling increments.
+    void SetScrollRate( int xstep, int ystep );
+
     // Number of pixels per user unit (0 or -1 for no scrollbar)
     // Length of virtual canvas in user units
     // Length of page in user units
+    // Default action is to set the virtual size and alter scrollbars
+    // accordingly.
     virtual void SetScrollbars(int pixelsPerUnitX, int pixelsPerUnitY,
                              int noUnitsX, int noUnitsY,
                              int xPos = 0, int yPos = 0,
@@ -95,9 +103,6 @@ public:
     void ViewStart(int *x, int *y) const
        { GetViewStart( x, y ); }
 
-    // Actual size in pixels when scrolling is taken into account
-    virtual void GetVirtualSize(int *x, int *y) const;
-
     // translate between scrolled and unscrolled coordinates
     void CalcScrolledPosition(int x, int y, int *xx, int *yy) const
         {  DoCalcScrolledPosition(x, y, xx, yy); }
@@ -163,10 +168,12 @@ protected:
     int                   m_yScrollPixelsPerLine;
     bool                  m_xScrollingEnabled;
     bool                  m_yScrollingEnabled;
+
+    // FIXME: these next four members are duplicated in the GtkAdjustment
+    //        members of wxWindow.  Can they be safely removed from here?
+
     int                   m_xScrollPosition;
     int                   m_yScrollPosition;
-    int                   m_xScrollLines;
-    int                   m_yScrollLines;
     int                   m_xScrollLinesPerPage;
     int                   m_yScrollLinesPerPage;
 
@@ -179,3 +186,5 @@ private:
 
 #endif
     // _WX_GTK_SCROLLWIN_H_
+
+// vi:sts=4:sw=4:et
diff --git a/include/wx/gtk1/scrolwin.h b/include/wx/gtk1/scrolwin.h
index 9d9c0d9a6e..ad017649b2 100644
--- a/include/wx/gtk1/scrolwin.h
+++ b/include/wx/gtk1/scrolwin.h
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        wx/generic/scrolwin.h
+// Name:        wx/gtk/scrolwin.h
 // Purpose:     wxScrolledWindow class
 // Author:      Robert Roebling
 // Modified by:
@@ -65,9 +65,17 @@ public:
     virtual void SetTargetWindow( wxWindow *target, bool pushEventHandler = FALSE );
     virtual wxWindow *GetTargetWindow();
 
+    // Set the scrolled area of the window.
+    virtual void DoSetVirtualSize( int x, int y );
+
+    // Set the x, y scrolling increments.
+    void SetScrollRate( int xstep, int ystep );
+
     // Number of pixels per user unit (0 or -1 for no scrollbar)
     // Length of virtual canvas in user units
     // Length of page in user units
+    // Default action is to set the virtual size and alter scrollbars
+    // accordingly.
     virtual void SetScrollbars(int pixelsPerUnitX, int pixelsPerUnitY,
                              int noUnitsX, int noUnitsY,
                              int xPos = 0, int yPos = 0,
@@ -95,9 +103,6 @@ public:
     void ViewStart(int *x, int *y) const
        { GetViewStart( x, y ); }
 
-    // Actual size in pixels when scrolling is taken into account
-    virtual void GetVirtualSize(int *x, int *y) const;
-
     // translate between scrolled and unscrolled coordinates
     void CalcScrolledPosition(int x, int y, int *xx, int *yy) const
         {  DoCalcScrolledPosition(x, y, xx, yy); }
@@ -163,10 +168,12 @@ protected:
     int                   m_yScrollPixelsPerLine;
     bool                  m_xScrollingEnabled;
     bool                  m_yScrollingEnabled;
+
+    // FIXME: these next four members are duplicated in the GtkAdjustment
+    //        members of wxWindow.  Can they be safely removed from here?
+
     int                   m_xScrollPosition;
     int                   m_yScrollPosition;
-    int                   m_xScrollLines;
-    int                   m_yScrollLines;
     int                   m_xScrollLinesPerPage;
     int                   m_yScrollLinesPerPage;
 
@@ -179,3 +186,5 @@ private:
 
 #endif
     // _WX_GTK_SCROLLWIN_H_
+
+// vi:sts=4:sw=4:et
diff --git a/include/wx/scrolwin.h b/include/wx/scrolwin.h
index 2986a6c9c4..8e12c38018 100644
--- a/include/wx/scrolwin.h
+++ b/include/wx/scrolwin.h
@@ -44,6 +44,9 @@ public:
     int GetScrollPageSize(int orient) const;
     void SetScrollPageSize(int orient, int pageSize);
 
+    // Set the x, y scrolling increments.
+    void SetScrollRate( int xstep, int ystep );
+
     // get the size of one logical unit in physical ones
     virtual void GetScrollPixelsPerUnit(int *pixelsPerUnitX,
                                         int *pixelsPerUnitY) const;
@@ -58,9 +61,6 @@ public:
     // Get the view start
     virtual void GetViewStart(int *x, int *y) const;
 
-    // Actual size in pixels when scrolling is taken into account
-    virtual void GetVirtualSize(int *x, int *y) const;
-
     // Set the scale factor, used in PrepareDC
     void SetScale(double xs, double ys) { m_scaleX = xs; m_scaleY = ys; }
     double GetScaleX() const { return m_scaleX; }
@@ -230,3 +230,5 @@ protected:
 
 #endif
     // _WX_SCROLWIN_H_BASE_
+
+// vi:sts=4:sw=4:et
diff --git a/include/wx/sizer.h b/include/wx/sizer.h
index 11b4e38912..d406d059b6 100644
--- a/include/wx/sizer.h
+++ b/include/wx/sizer.h
@@ -2,7 +2,7 @@
 // Name:        sizer.h
 // Purpose:     provide wxSizer class for layouting
 // Author:      Robert Roebling and Robin Dunn
-// Modified by:
+// Modified by: Ron Lee
 // Created:
 // RCS-ID:      $Id$
 // Copyright:   (c) Robin Dunn, Dirk Holtwick and Robert Roebling
@@ -185,7 +185,9 @@ public:
     virtual void Layout();
 
     void Fit( wxWindow *window );
+    void FitInside( wxWindow *window );
     void SetSizeHints( wxWindow *window );
+    void SetVirtualSizeHints( wxWindow *window );
 
     wxList& GetChildren()
         { return m_children; }
@@ -200,7 +202,10 @@ protected:
 
     wxSize GetMaxWindowSize( wxWindow *window );
     wxSize GetMinWindowSize( wxWindow *window );
+    wxSize GetMaxClientSize( wxWindow *window );
+    wxSize GetMinClientSize( wxWindow *window );
     wxSize FitSize( wxWindow *window );
+    wxSize VirtualFitSize( wxWindow *window );
 
     virtual void DoSetMinSize( int width, int height );
     virtual bool DoSetItemMinSize( wxWindow *window, int width, int height );
diff --git a/include/wx/window.h b/include/wx/window.h
index 1b7071d626..25cb7ad47b 100644
--- a/include/wx/window.h
+++ b/include/wx/window.h
@@ -2,7 +2,7 @@
 // Name:        wx/window.h
 // Purpose:     wxWindowBase class - the interface of wxWindow
 // Author:      Vadim Zeitlin
-// Modified by:
+// Modified by: Ron Lee
 // Created:     01/02/97
 // RCS-ID:      $Id$
 // Copyright:   (c) wxWindows team
@@ -293,6 +293,9 @@ public:
                                int maxW = -1, int maxH = -1,
                                int incW = -1, int incH = -1 );
 
+    virtual void SetVirtualSizeHints( int minW, int minH,
+                                      int maxW = -1, int maxH = -1 );
+
     virtual int GetMinWidth() const { return m_minWidth; }
     virtual int GetMinHeight() const { return m_minHeight; }
     int GetMaxWidth() const { return m_maxWidth; }
@@ -301,6 +304,33 @@ public:
         // Override this method to control the values given to Sizers etc.
     virtual wxSize GetMaxSize() const { return wxSize( m_maxWidth, m_maxHeight ); }
 
+        // Methods for accessing the virtual size of a window.  For most
+        // windows this is just the client area of the window, but for
+        // some like scrolled windows it is more or less independent of
+        // the screen window size.  You may override the DoXXXVirtual
+        // methods below for classes where that is is the case.
+
+    void SetVirtualSize( const wxSize &size ) { DoSetVirtualSize( size.x, size.y ); }
+    void SetVirtualSize( int x, int y ) { DoSetVirtualSize( x, y ); }
+
+    wxSize GetVirtualSize() const { return DoGetVirtualSize(); }
+    void GetVirtualSize( int *x, int *y ) const
+    {
+        wxSize s( DoGetVirtualSize() );
+
+        if( x )
+            *x = s.GetWidth();
+        if( y )
+            *y = s.GetHeight();
+    }
+
+        // Override these methods for windows that have a virtual size
+        // independent of their client size.  eg. the virtual area of a
+        // wxScrolledWindow.  Default is to alias VirtualSize to ClientSize.
+
+    virtual void DoSetVirtualSize( int x, int y );
+    virtual wxSize DoGetVirtualSize() const; // { return m_virtualSize; }
+
     // window state
     // ------------
 
@@ -740,6 +770,8 @@ public:
 
         // sizers
     void SetSizer(wxSizer *sizer, bool deleteOld = TRUE );
+    void SetSizerAndFit( wxSizer *sizer, bool deleteOld = TRUE );
+
     wxSizer *GetSizer() const { return m_windowSizer; }
 
     // Track if this window is a member of a sizer
@@ -790,6 +822,7 @@ public:
 #endif // wxUSE_PALETTE
 
 protected:
+
     // the window id - a number which uniquely identifies a window among
     // its siblings unless it is -1
     wxWindowID           m_windowId;
@@ -878,7 +911,13 @@ protected:
     bool                 m_hasCustomPalette;
 #endif // wxUSE_PALETTE
 
-protected:
+    // Virtual size (scrolling)
+    wxSize                m_virtualSize;
+
+    int                   m_minVirtualWidth;    // VirtualSizeHints
+    int                   m_minVirtualHeight;
+    int                   m_maxVirtualWidth;
+    int                   m_maxVirtualHeight;
 
     // common part of all ctors: it is not virtual because it is called from
     // ctor
diff --git a/samples/scrollsub/scrollsub.cpp b/samples/scrollsub/scrollsub.cpp
index 3d16d9e91d..f47a253c6b 100644
--- a/samples/scrollsub/scrollsub.cpp
+++ b/samples/scrollsub/scrollsub.cpp
@@ -210,7 +210,18 @@ MyTopLabels::MyTopLabels( wxScrolledWindow *parent, wxWindowID id, const wxPoint
 void MyTopLabels::OnPaint( wxPaintEvent &event )
 {
     wxPaintDC dc(this);
-    m_owner->PrepareDC( dc );
+
+    // This is wrong..  it will translate both x and y if the
+    // window is scrolled, the label windows are active in one
+    // direction only.  Do the action below instead -- RL.
+    //m_owner->PrepareDC( dc );
+
+    int xScrollUnits, xOrigin;
+
+    m_owner->GetViewStart( &xOrigin, 0 );
+    m_owner->GetScrollPixelsPerUnit( &xScrollUnits, 0 );
+    dc.SetDeviceOrigin( -xOrigin * xScrollUnits, 0 );
+
     dc.DrawText( "Column 1", 5, 5 );
     dc.DrawText( "Column 2", 105, 5 );
     dc.DrawText( "Column 3", 205, 5 );
@@ -233,7 +244,18 @@ MyRightLabels::MyRightLabels( wxScrolledWindow *parent, wxWindowID id, const wxP
 void MyRightLabels::OnPaint( wxPaintEvent &event )
 {
     wxPaintDC dc(this);
-    m_owner->PrepareDC( dc );
+
+    // This is wrong..  it will translate both x and y if the
+    // window is scrolled, the label windows are active in one
+    // direction only.  Do the action below instead -- RL.
+    //m_owner->PrepareDC( dc );
+
+    int yScrollUnits, yOrigin;
+
+    m_owner->GetViewStart( 0, &yOrigin );
+    m_owner->GetScrollPixelsPerUnit( 0, &yScrollUnits );
+    dc.SetDeviceOrigin( 0, -yOrigin * yScrollUnits );
+
     dc.DrawText( "Row 1", 5, 5 );
     dc.DrawText( "Row 2", 5, 30 );
     dc.DrawText( "Row 3", 5, 55 );
diff --git a/src/common/parser.y b/src/common/parser.y
index a5dcdf37a7..c922f8c04a 100644
--- a/src/common/parser.y
+++ b/src/common/parser.y
@@ -97,6 +97,7 @@ arg	:	WORD EQUALS arg1
                          free($1); }
 	|	arg1
 			{$$ = $1; }
+	;
 
 arg1	:	WORD
 			{$$ = wxmake_word($1); free($1);}
diff --git a/src/common/sizer.cpp b/src/common/sizer.cpp
index f20410f51d..3233856426 100644
--- a/src/common/sizer.cpp
+++ b/src/common/sizer.cpp
@@ -2,7 +2,7 @@
 // Name:        sizer.cpp
 // Purpose:     provide new wxSizer class for layout
 // Author:      Robert Roebling and Robin Dunn
-// Modified by:
+// Modified by: Ron Lee
 // Created:
 // RCS-ID:      $Id$
 // Copyright:   (c) Robin Dunn, Dirk Holtwick and Robert Roebling
@@ -412,6 +412,17 @@ void wxSizer::Fit( wxWindow *window )
     window->SetSize( size );
 }
 
+void wxSizer::FitInside( wxWindow *window )
+{
+    wxSize size;
+    if (window->IsTopLevel())
+        size = VirtualFitSize( window );
+    else
+        size = GetMinClientSize( window );
+
+    window->SetVirtualSize( size );
+}
+
 void wxSizer::Layout()
 {
     CalcMin();
@@ -423,13 +434,27 @@ void wxSizer::SetSizeHints( wxWindow *window )
     // Preserve the window's max size hints, but set the
     // lower bound according to the sizer calculations.
 
-    wxSize size = FitSize( window );
+    Fit( window );
+    wxSize  size( window->GetSize() );
     window->SetSizeHints( size.x,
                           size.y,
                           window->GetMaxWidth(),
                           window->GetMaxHeight() );
 }
 
+void wxSizer::SetVirtualSizeHints( wxWindow *window )
+{
+    // Preserve the window's max size hints, but set the
+    // lower bound according to the sizer calculations.
+
+    FitInside( window );
+    wxSize size( window->GetVirtualSize() );
+    window->SetVirtualSizeHints( size.x,
+                                 size.y,
+                                 window->GetMaxWidth(),
+                                 window->GetMaxHeight() );
+}
+
 wxSize wxSizer::GetMaxWindowSize( wxWindow *window )
 {
     return window->GetMaxSize();
@@ -460,6 +485,42 @@ wxSize wxSizer::FitSize( wxWindow *window )
     return size;
 }
 
+wxSize wxSizer::GetMaxClientSize( wxWindow *window )
+{
+    wxSize maxSize( window->GetMaxSize() );
+
+    if( maxSize != wxDefaultSize )
+    {
+        wxSize size( window->GetSize() );
+        wxSize client_size( window->GetClientSize() );
+
+        return wxSize( maxSize.x + client_size.x - size.x,
+                       maxSize.y + client_size.y - size.y );
+    }
+    else
+        return wxDefaultSize;
+}
+
+wxSize wxSizer::GetMinClientSize( wxWindow *window )
+{
+    return GetMinSize();  // Already returns client size.
+}
+
+wxSize wxSizer::VirtualFitSize( wxWindow *window )
+{
+    wxSize size     = GetMinClientSize( window );
+    wxSize sizeMax  = GetMaxClientSize( window );
+
+    // Limit the size if sizeMax != wxDefaultSize
+
+    if ( size.x > sizeMax.x && sizeMax.x != -1 )
+        size.x = sizeMax.x;
+    if ( size.y > sizeMax.y && sizeMax.y != -1 )
+        size.y = sizeMax.y;
+
+    return size;
+}
+
 void wxSizer::SetDimension( int x, int y, int width, int height )
 {
     m_position.x = x;
diff --git a/src/common/wincmn.cpp b/src/common/wincmn.cpp
index 2641125c24..ec06700081 100644
--- a/src/common/wincmn.cpp
+++ b/src/common/wincmn.cpp
@@ -174,6 +174,12 @@ void wxWindowBase::InitBase()
     m_hasCustomPalette = FALSE;
 #endif // wxUSE_PALETTE
 
+    m_virtualSize = wxDefaultSize;
+    m_minVirtualWidth = -1;
+    m_minVirtualHeight = -1;
+    m_maxVirtualWidth = -1;
+    m_maxVirtualHeight = -1;
+
     // Whether we're using the current theme for this window (wxGTK only for now)
     m_themeEnabled = FALSE;
 }
@@ -522,6 +528,40 @@ void wxWindowBase::SetSizeHints(int minW, int minH,
     m_maxHeight = maxH;
 }
 
+void wxWindowBase::SetVirtualSizeHints( int minW, int minH,
+                                        int maxW, int maxH )
+{
+    m_minVirtualWidth = minW;
+    m_maxVirtualWidth = maxW;
+    m_minVirtualHeight = minH;
+    m_maxVirtualHeight = maxH;
+
+    SetVirtualSize( GetClientSize() );
+}
+
+void wxWindowBase::DoSetVirtualSize( int x, int y )
+{
+    if( m_minVirtualWidth != -1 && m_minVirtualWidth > x )   x = m_minVirtualWidth;
+    if( m_maxVirtualWidth != -1 && m_maxVirtualWidth < x )   x = m_maxVirtualWidth;
+    if( m_minVirtualHeight != -1 && m_minVirtualHeight > y ) y = m_minVirtualHeight;
+    if( m_maxVirtualHeight != -1 && m_maxVirtualHeight < y ) y = m_maxVirtualHeight;
+
+    m_virtualSize.SetWidth( x );
+    m_virtualSize.SetHeight( y );
+}
+
+wxSize wxWindowBase::DoGetVirtualSize() const
+{
+    wxSize  s( GetClientSize() );
+
+    if( m_virtualSize.GetWidth() != -1 )
+        s.SetWidth( m_virtualSize.GetWidth() );
+    if( m_virtualSize.GetHeight() != -1 )
+        s.SetHeight( m_virtualSize.GetHeight() );
+
+    return s;
+}
+
 // ----------------------------------------------------------------------------
 // show/hide/enable/disable the window
 // ----------------------------------------------------------------------------
@@ -1190,6 +1230,14 @@ void wxWindowBase::SetSizer(wxSizer *sizer, bool deleteOld)
     if (m_windowSizer && deleteOld) delete m_windowSizer;
 
     m_windowSizer = sizer;
+
+    SetAutoLayout( sizer != 0 );
+}
+
+void wxWindowBase::SetSizerAndFit(wxSizer *sizer, bool deleteOld)
+{
+    SetSizer( sizer, deleteOld );
+    sizer->SetSizeHints( (wxWindow*) this );
 }
 
 bool wxWindowBase::Layout()
@@ -1198,8 +1246,7 @@ bool wxWindowBase::Layout()
     if ( GetSizer() )
     {
         int w, h;
-        GetClientSize(&w, &h);
-
+        GetVirtualSize(&w, &h);
         GetSizer()->SetDimension( 0, 0, w, h );
     }
 #if wxUSE_CONSTRAINTS
diff --git a/src/generic/scrlwing.cpp b/src/generic/scrlwing.cpp
index 904104e371..e05628749d 100644
--- a/src/generic/scrlwing.cpp
+++ b/src/generic/scrlwing.cpp
@@ -2,7 +2,8 @@
 // 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:      $Id$
 // Copyright:   (c) wxWindows team
@@ -326,10 +327,10 @@ void wxScrollHelper::SetScrollbars(int pixelsPerUnitX,
     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 < m_yScrollLines && ypos > pixelsPerUnitY*noUnitsY) ||
+      (noUnitsY < m_yScrollLines && ypos > pixelsPerUnitY * noUnitsY) ||
       (xPos != m_xScrollPosition) ||
       (yPos != m_yScrollPosition)
     );
@@ -338,43 +339,8 @@ void wxScrollHelper::SetScrollbars(int pixelsPerUnitX,
     m_yScrollPixelsPerLine = pixelsPerUnitY;
     m_xScrollPosition = xPos;
     m_yScrollPosition = yPos;
-    m_xScrollLines = noUnitsX;
-    m_yScrollLines = noUnitsY;
 
-#ifdef __WXMOTIF__
-    // Sorry, some Motif-specific code to implement a backing pixmap
-    // for the wxRETAINED style. Implementing a backing store can't
-    // be entirely generic because it relies on the wxWindowDC implementation
-    // to duplicate X drawing calls for the backing pixmap.
-
-    if ( m_targetWindow->GetWindowStyle() & wxRETAINED )
-    {
-        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() &&
-           (noUnitsX != 0) && (noUnitsY != 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
-
-    AdjustScrollbars();
+    m_targetWindow->SetVirtualSizeHints( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
 
     if (do_refresh && !noRefresh)
         m_targetWindow->Refresh(TRUE, GetRect());
@@ -615,64 +581,116 @@ void wxScrollHelper::AdjustScrollbars()
     m_targetWindow->MacUpdateImmediately();
 #endif
 
-    int w, h;
-    GetTargetSize(&w, &h);
+    int w = 0, h = 0;
+    int oldw, oldh;
 
     int oldXScroll = m_xScrollPosition;
     int oldYScroll = m_yScrollPosition;
 
-    if (m_xScrollLines > 0)
-    {
-        // Calculate page size i.e. number of scroll units you get on the
-        // current client window
-        int noPagePositions = (int) ( (w/(double)m_xScrollPixelsPerLine) + 0.5 );
-        if (noPagePositions < 1) noPagePositions = 1;
-        if ( noPagePositions > m_xScrollLines )
-            noPagePositions = m_xScrollLines;
+    do {
+        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 );
+        if (m_xScrollPixelsPerLine == 0)
+        {
+            m_xScrollLines = 0;
+            m_xScrollPosition = 0;
+            m_win->SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);
+        }
+        else
+        {
+            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);
+        }
 
-        m_win->SetScrollbar(wxHORIZONTAL, m_xScrollPosition, noPagePositions, m_xScrollLines);
-        // The amount by which we scroll when paging
-        SetScrollPageSize(wxHORIZONTAL, noPagePositions);
-    }
-    else
-    {
-        m_xScrollPosition = 0;
-        m_win->SetScrollbar (wxHORIZONTAL, 0, 0, 0, FALSE);
-    }
+        GetTargetSize(0, &h);
 
-    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;
+        if (m_yScrollPixelsPerLine == 0)
+        {
+            m_yScrollLines = 0;
+            m_yScrollPosition = 0;
+            m_win->SetScrollbar (wxVERTICAL, 0, 0, 0, FALSE);
+        }
+        else
+        {
+            m_yScrollLines = m_targetWindow->GetVirtualSize().GetHeight() / m_yScrollPixelsPerLine;
+
+            // 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;
+
+            // 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 );
+
+            m_win->SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, m_yScrollLines);
+            // The amount by which we scroll when paging
+            SetScrollPageSize(wxVERTICAL, noPagePositions);
+        }
 
-        // 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 a scrollbar (dis)appeared as a result of this, adjust them again.
 
-        m_win->SetScrollbar(wxVERTICAL, m_yScrollPosition, noPagePositions, m_yScrollLines);
-        // The amount by which we scroll when paging
-        SetScrollPageSize(wxVERTICAL, noPagePositions);
-    }
-    else
+        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_win->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() &&
+           (noUnitsX != 0) && (noUnitsY != 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)
-            m_targetWindow->ScrollWindow( m_xScrollPixelsPerLine * (oldXScroll-m_xScrollPosition), 0,
+            m_targetWindow->ScrollWindow( m_xScrollPixelsPerLine * (oldXScroll - m_xScrollPosition), 0,
                                           GetRect() );
        else
             m_targetWindow->Refresh(TRUE, GetRect());
@@ -700,6 +718,24 @@ void wxScrollHelper::DoPrepareDC(wxDC& dc)
     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 )
@@ -797,28 +833,6 @@ void wxScrollHelper::EnableScrolling (bool x_scroll, bool y_scroll)
     m_yScrollingEnabled = y_scroll;
 }
 
-void wxScrollHelper::GetVirtualSize (int *x, int *y) const
-{
-    wxSize sz(0, 0);
-    if (m_targetWindow)
-        sz = m_targetWindow->GetClientSize();
-
-    if ( x )
-    {
-        if (m_xScrollPixelsPerLine == 0)
-            *x = sz.x;
-        else
-            *x = m_xScrollPixelsPerLine * m_xScrollLines;
-    }
-    if ( y )
-    {
-        if (m_yScrollPixelsPerLine == 0)
-            *y = sz.y;
-        else
-            *y = m_yScrollPixelsPerLine * m_yScrollLines;
-    }
-}
-
 // Where the current view starts from
 void wxScrollHelper::GetViewStart (int *x, int *y) const
 {
@@ -851,7 +865,15 @@ void wxScrollHelper::DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) co
 // Default OnSize resets scrollbars, if any
 void wxScrollHelper::HandleOnSize(wxSizeEvent& WXUNUSED(event))
 {
-    AdjustScrollbars();
+    if( m_targetWindow != m_win )
+        m_targetWindow->SetVirtualSize( m_targetWindow->GetClientSize() );
+
+    m_win->SetVirtualSize( m_win->GetClientSize() );
+
+#if wxUSE_CONSTRAINTS
+    if (m_win->GetAutoLayout())
+        m_win->Layout();
+#endif
 }
 
 // This calls OnDraw, having adjusted the origin according to the current
@@ -877,7 +899,7 @@ void wxScrollHelper::HandleOnChar(wxKeyEvent& event)
 
     GetViewStart(&stx, &sty);
     GetTargetSize(&clix, &cliy);
-    GetVirtualSize(&szx, &szy);
+    m_targetWindow->GetVirtualSize(&szx, &szy);
 
     if( m_xScrollPixelsPerLine )
     {
@@ -1121,9 +1143,11 @@ wxGenericScrolledWindow::~wxGenericScrolledWindow()
 
 bool wxGenericScrolledWindow::Layout()
 {
-    if (GetSizer())
+    if (GetSizer() && m_targetWindow == this)
     {
-        // Take into account the virtual size and scrolled position of the window
+        // 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);
@@ -1135,6 +1159,12 @@ bool wxGenericScrolledWindow::Layout()
     return wxPanel::Layout();
 }
 
+void wxGenericScrolledWindow::DoSetVirtualSize( int x, int y )
+{
+    wxPanel::DoSetVirtualSize( x, y );
+    AdjustScrollbars();
+}
+
 void wxGenericScrolledWindow::OnPaint(wxPaintEvent& event)
 {
     // the user code didn't really draw the window if we got here, so set this
@@ -1183,3 +1213,4 @@ void wxGenericScrolledWindow::CalcUnscrolledPosition(int x, int y, float *xx, fl
 
 #endif // !wxGTK
 
+// vi:sts=4:sw=4:et
diff --git a/src/gtk/scrolwin.cpp b/src/gtk/scrolwin.cpp
index fe7bf353ea..0a5ec3f800 100644
--- a/src/gtk/scrolwin.cpp
+++ b/src/gtk/scrolwin.cpp
@@ -2,7 +2,7 @@
 // Name:        gtk/scrolwin.cpp
 // Purpose:     wxScrolledWindow implementation
 // Author:      Julian Smart
-// Modified by:
+// Modified by: Ron Lee
 // Created:     01/02/97
 // RCS-ID:      $Id$
 // Copyright:   (c) Julian Smart and Markus Holzem
@@ -202,8 +202,6 @@ void wxScrolledWindow::Init()
     m_yScrollingEnabled = TRUE;
     m_xScrollPosition = 0;
     m_yScrollPosition = 0;
-    m_xScrollLines = 0;
-    m_yScrollLines = 0;
     m_xScrollLinesPerPage = 0;
     m_yScrollLinesPerPage = 0;
     m_targetWindow = (wxWindow*) NULL;
@@ -323,51 +321,47 @@ bool wxScrolledWindow::Create(wxWindow *parent,
 // setting scrolling parameters
 // ----------------------------------------------------------------------------
 
+void wxScrolledWindow::DoSetVirtualSize( int x, int y )
+{
+    wxPanel::DoSetVirtualSize( x, y );
+    AdjustScrollbars();
+}
+
 /*
  * pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
  * noUnitsX/noUnitsY:        : no. units per scrollbar
  */
-void wxScrolledWindow::SetScrollbars (int pixelsPerUnitX, int pixelsPerUnitY,
-               int noUnitsX, int noUnitsY,
-               int xPos, int yPos, bool noRefresh )
+void wxScrolledWindow::SetScrollbars( int pixelsPerUnitX, int pixelsPerUnitY,
+                                      int noUnitsX, int noUnitsY,
+                                      int xPos, int yPos, bool noRefresh )
 {
     int old_x = m_xScrollPixelsPerLine * m_xScrollPosition;
     int old_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 
     m_xScrollPixelsPerLine = pixelsPerUnitX;
     m_yScrollPixelsPerLine = pixelsPerUnitY;
-    m_xScrollLines = noUnitsX;
-    m_yScrollLines = noUnitsY;
-    m_xScrollPosition = xPos;
-    m_yScrollPosition = yPos;
 
-    m_hAdjust->lower = 0.0;
-    m_hAdjust->upper = noUnitsX;
-    m_hAdjust->value = xPos;
-    m_hAdjust->step_increment = 1.0;
-    m_hAdjust->page_increment = 2.0;
+    m_hAdjust->value = m_xScrollPosition = xPos;
+    m_vAdjust->value = m_yScrollPosition = yPos;
 
-    m_vAdjust->lower = 0.0;
-    m_vAdjust->upper = noUnitsY;
-    m_vAdjust->value = yPos;
-    m_vAdjust->step_increment = 1.0;
-    m_vAdjust->page_increment = 2.0;
-
-    AdjustScrollbars();
+    m_targetWindow->SetVirtualSizeHints( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
 
     if (!noRefresh)
     {
         int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
         int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 
-        m_targetWindow->ScrollWindow( old_x-new_x, old_y-new_y );
+        m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
     }
 }
 
 void wxScrolledWindow::AdjustScrollbars()
 {
     int w, h;
+    int vw, vh;
+
     m_targetWindow->GetClientSize( &w, &h );
+    m_targetWindow->GetVirtualSize( &vw, &vh );
 
     if (m_xScrollPixelsPerLine == 0)
     {
@@ -376,21 +370,18 @@ void wxScrolledWindow::AdjustScrollbars()
     }
     else
     {
+        m_hAdjust->upper = vw / m_xScrollPixelsPerLine;
         m_hAdjust->page_size = (w / m_xScrollPixelsPerLine);
 
-        int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
-        if (max < 0) max = 0;
-        
-        int x_pos = m_xScrollPosition;
-        if (x_pos > max) x_pos = max;
-        if (x_pos < 0) x_pos = 0;
-
-        int old_x = m_xScrollPosition;
-        m_xScrollPosition = x_pos;
-        m_hAdjust->value = x_pos;
+        // If the scrollbar hits the right side, move the window
+        // right to keep it from over extending.
 
-        if (x_pos != old_x)
-            m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
+        if( m_hAdjust->value + m_hAdjust->page_size > m_hAdjust->upper )
+        {
+            m_hAdjust->value = m_hAdjust->upper - m_hAdjust->page_size;
+            m_targetWindow->ScrollWindow( (m_xScrollPosition - m_hAdjust->value) * m_xScrollPixelsPerLine, 0 );
+            m_xScrollPosition = (int)m_hAdjust->value;
+        }
     }
 
     if (m_yScrollPixelsPerLine == 0)
@@ -400,21 +391,15 @@ void wxScrolledWindow::AdjustScrollbars()
     }
     else
     {
+        m_vAdjust->upper = vh / m_yScrollPixelsPerLine;
         m_vAdjust->page_size = (h / m_yScrollPixelsPerLine);
 
-        int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
-        if (max < 0) max = 0;
-        
-        int y_pos = m_yScrollPosition;
-        if (y_pos > max) y_pos = max;
-        if (y_pos < 0) y_pos = 0;
-
-        int old_y = m_yScrollPosition;
-        m_yScrollPosition = y_pos;
-        m_vAdjust->value = y_pos;
-
-        if (y_pos != old_y)
-            m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
+        if( m_vAdjust->value + m_vAdjust->page_size > m_vAdjust->upper )
+        {
+            m_vAdjust->value = m_vAdjust->upper - m_vAdjust->page_size;
+            m_targetWindow->ScrollWindow( 0, (m_yScrollPosition - m_vAdjust->value) * m_yScrollPixelsPerLine );
+            m_yScrollPosition = (int)m_vAdjust->value;
+        }
     }
 
     m_xScrollLinesPerPage = (int)(m_hAdjust->page_size + 0.5);
@@ -424,6 +409,7 @@ void wxScrolledWindow::AdjustScrollbars()
     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 }
 
+
 // ----------------------------------------------------------------------------
 // target window handling
 // ----------------------------------------------------------------------------
@@ -447,6 +433,22 @@ void wxScrolledWindow::PrepareDC(wxDC& dc)
                         -m_yScrollPosition * m_yScrollPixelsPerLine );
 }
 
+void wxScrolledWindow::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_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
+
+    AdjustScrollbars();
+}
+
 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 {
     if ( x_unit )
@@ -516,8 +518,7 @@ void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
 
 void wxScrolledWindow::Scroll( int x_pos, int y_pos )
 {
-    if (!m_targetWindow)
-        return;
+    wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 
     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
@@ -565,8 +566,7 @@ void wxScrolledWindow::Scroll( int x_pos, int y_pos )
 
 void wxScrolledWindow::GtkVScroll( float value, unsigned int scroll_type )
 {
-    if (!m_targetWindow)
-        return;
+    wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 
     if (m_yScrollPixelsPerLine == 0)
         return;
@@ -585,8 +585,7 @@ void wxScrolledWindow::GtkVScroll( float value, unsigned int scroll_type )
 
 void wxScrolledWindow::GtkHScroll( float value, unsigned int scroll_type )
 {
-    if (!m_targetWindow)
-        return;
+    wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 
     if (m_xScrollPixelsPerLine == 0)
         return;
@@ -609,28 +608,6 @@ void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
     m_yScrollingEnabled = y_scroll;
 }
 
-void wxScrolledWindow::GetVirtualSize (int *x, int *y) const
-{
-    wxSize sz(0, 0);
-    if (m_targetWindow)
-        sz = m_targetWindow->GetClientSize();
-
-    if ( x )
-    {
-        if (m_xScrollPixelsPerLine == 0)
-            *x = sz.x;
-        else
-            *x = m_xScrollPixelsPerLine * m_xScrollLines;
-    }
-    if ( y )
-    {
-        if (m_yScrollPixelsPerLine == 0)
-            *y = sz.y;
-        else
-            *y = m_yScrollPixelsPerLine * m_yScrollLines;
-    }
-}
-
 // Where the current view starts from
 void wxScrolledWindow::GetViewStart (int *x, int *y) const
 {
@@ -672,9 +649,9 @@ int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
     {
             if (orient == wxHORIZONTAL)
-                nScrollInc = m_xScrollLines - m_xScrollPosition;
+                nScrollInc = GetVirtualSize().GetWidth() / m_xScrollPixelsPerLine - m_xScrollPosition;
             else
-                nScrollInc = m_yScrollLines - m_yScrollPosition;
+                nScrollInc = GetVirtualSize().GetHeight() / m_yScrollPixelsPerLine - m_yScrollPosition;
     } else
     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
     {
@@ -813,12 +790,13 @@ void wxScrolledWindow::GtkVDisconnectEvent()
         (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 }
 
-
 bool wxScrolledWindow::Layout()
 {
-    if (GetSizer())
+    if (GetSizer() && m_targetWindow == this)
     {
-        // Take into account the virtual size and scrolled position of the window
+        // 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);
@@ -836,12 +814,15 @@ bool wxScrolledWindow::Layout()
 // Default OnSize resets scrollbars, if any
 void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 {
+    if( m_targetWindow != this )
+        m_targetWindow->SetVirtualSize( m_targetWindow->GetClientSize() );
+
+    SetVirtualSize( GetClientSize() );
+
 #if wxUSE_CONSTRAINTS
     if (GetAutoLayout())
         Layout();
 #endif
-
-    AdjustScrollbars();
 }
 
 // This calls OnDraw, having adjusted the origin according to the current
@@ -955,3 +936,5 @@ void wxScrolledWindow::OnChar(wxKeyEvent& event)
     }
 }
 
+
+// vi:sts=4:sw=4:et
diff --git a/src/gtk1/scrolwin.cpp b/src/gtk1/scrolwin.cpp
index fe7bf353ea..0a5ec3f800 100644
--- a/src/gtk1/scrolwin.cpp
+++ b/src/gtk1/scrolwin.cpp
@@ -2,7 +2,7 @@
 // Name:        gtk/scrolwin.cpp
 // Purpose:     wxScrolledWindow implementation
 // Author:      Julian Smart
-// Modified by:
+// Modified by: Ron Lee
 // Created:     01/02/97
 // RCS-ID:      $Id$
 // Copyright:   (c) Julian Smart and Markus Holzem
@@ -202,8 +202,6 @@ void wxScrolledWindow::Init()
     m_yScrollingEnabled = TRUE;
     m_xScrollPosition = 0;
     m_yScrollPosition = 0;
-    m_xScrollLines = 0;
-    m_yScrollLines = 0;
     m_xScrollLinesPerPage = 0;
     m_yScrollLinesPerPage = 0;
     m_targetWindow = (wxWindow*) NULL;
@@ -323,51 +321,47 @@ bool wxScrolledWindow::Create(wxWindow *parent,
 // setting scrolling parameters
 // ----------------------------------------------------------------------------
 
+void wxScrolledWindow::DoSetVirtualSize( int x, int y )
+{
+    wxPanel::DoSetVirtualSize( x, y );
+    AdjustScrollbars();
+}
+
 /*
  * pixelsPerUnitX/pixelsPerUnitY: number of pixels per unit (e.g. pixels per text line)
  * noUnitsX/noUnitsY:        : no. units per scrollbar
  */
-void wxScrolledWindow::SetScrollbars (int pixelsPerUnitX, int pixelsPerUnitY,
-               int noUnitsX, int noUnitsY,
-               int xPos, int yPos, bool noRefresh )
+void wxScrolledWindow::SetScrollbars( int pixelsPerUnitX, int pixelsPerUnitY,
+                                      int noUnitsX, int noUnitsY,
+                                      int xPos, int yPos, bool noRefresh )
 {
     int old_x = m_xScrollPixelsPerLine * m_xScrollPosition;
     int old_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 
     m_xScrollPixelsPerLine = pixelsPerUnitX;
     m_yScrollPixelsPerLine = pixelsPerUnitY;
-    m_xScrollLines = noUnitsX;
-    m_yScrollLines = noUnitsY;
-    m_xScrollPosition = xPos;
-    m_yScrollPosition = yPos;
 
-    m_hAdjust->lower = 0.0;
-    m_hAdjust->upper = noUnitsX;
-    m_hAdjust->value = xPos;
-    m_hAdjust->step_increment = 1.0;
-    m_hAdjust->page_increment = 2.0;
+    m_hAdjust->value = m_xScrollPosition = xPos;
+    m_vAdjust->value = m_yScrollPosition = yPos;
 
-    m_vAdjust->lower = 0.0;
-    m_vAdjust->upper = noUnitsY;
-    m_vAdjust->value = yPos;
-    m_vAdjust->step_increment = 1.0;
-    m_vAdjust->page_increment = 2.0;
-
-    AdjustScrollbars();
+    m_targetWindow->SetVirtualSizeHints( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
 
     if (!noRefresh)
     {
         int new_x = m_xScrollPixelsPerLine * m_xScrollPosition;
         int new_y = m_yScrollPixelsPerLine * m_yScrollPosition;
 
-        m_targetWindow->ScrollWindow( old_x-new_x, old_y-new_y );
+        m_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
     }
 }
 
 void wxScrolledWindow::AdjustScrollbars()
 {
     int w, h;
+    int vw, vh;
+
     m_targetWindow->GetClientSize( &w, &h );
+    m_targetWindow->GetVirtualSize( &vw, &vh );
 
     if (m_xScrollPixelsPerLine == 0)
     {
@@ -376,21 +370,18 @@ void wxScrolledWindow::AdjustScrollbars()
     }
     else
     {
+        m_hAdjust->upper = vw / m_xScrollPixelsPerLine;
         m_hAdjust->page_size = (w / m_xScrollPixelsPerLine);
 
-        int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
-        if (max < 0) max = 0;
-        
-        int x_pos = m_xScrollPosition;
-        if (x_pos > max) x_pos = max;
-        if (x_pos < 0) x_pos = 0;
-
-        int old_x = m_xScrollPosition;
-        m_xScrollPosition = x_pos;
-        m_hAdjust->value = x_pos;
+        // If the scrollbar hits the right side, move the window
+        // right to keep it from over extending.
 
-        if (x_pos != old_x)
-            m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
+        if( m_hAdjust->value + m_hAdjust->page_size > m_hAdjust->upper )
+        {
+            m_hAdjust->value = m_hAdjust->upper - m_hAdjust->page_size;
+            m_targetWindow->ScrollWindow( (m_xScrollPosition - m_hAdjust->value) * m_xScrollPixelsPerLine, 0 );
+            m_xScrollPosition = (int)m_hAdjust->value;
+        }
     }
 
     if (m_yScrollPixelsPerLine == 0)
@@ -400,21 +391,15 @@ void wxScrolledWindow::AdjustScrollbars()
     }
     else
     {
+        m_vAdjust->upper = vh / m_yScrollPixelsPerLine;
         m_vAdjust->page_size = (h / m_yScrollPixelsPerLine);
 
-        int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
-        if (max < 0) max = 0;
-        
-        int y_pos = m_yScrollPosition;
-        if (y_pos > max) y_pos = max;
-        if (y_pos < 0) y_pos = 0;
-
-        int old_y = m_yScrollPosition;
-        m_yScrollPosition = y_pos;
-        m_vAdjust->value = y_pos;
-
-        if (y_pos != old_y)
-            m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
+        if( m_vAdjust->value + m_vAdjust->page_size > m_vAdjust->upper )
+        {
+            m_vAdjust->value = m_vAdjust->upper - m_vAdjust->page_size;
+            m_targetWindow->ScrollWindow( 0, (m_yScrollPosition - m_vAdjust->value) * m_yScrollPixelsPerLine );
+            m_yScrollPosition = (int)m_vAdjust->value;
+        }
     }
 
     m_xScrollLinesPerPage = (int)(m_hAdjust->page_size + 0.5);
@@ -424,6 +409,7 @@ void wxScrolledWindow::AdjustScrollbars()
     gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
 }
 
+
 // ----------------------------------------------------------------------------
 // target window handling
 // ----------------------------------------------------------------------------
@@ -447,6 +433,22 @@ void wxScrolledWindow::PrepareDC(wxDC& dc)
                         -m_yScrollPosition * m_yScrollPixelsPerLine );
 }
 
+void wxScrolledWindow::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_targetWindow->ScrollWindow( old_x - new_x, old_y - new_y );
+
+    AdjustScrollbars();
+}
+
 void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
 {
     if ( x_unit )
@@ -516,8 +518,7 @@ void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
 
 void wxScrolledWindow::Scroll( int x_pos, int y_pos )
 {
-    if (!m_targetWindow)
-        return;
+    wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 
     if (((x_pos == -1) || (x_pos == m_xScrollPosition)) &&
         ((y_pos == -1) || (y_pos == m_yScrollPosition))) return;
@@ -565,8 +566,7 @@ void wxScrolledWindow::Scroll( int x_pos, int y_pos )
 
 void wxScrolledWindow::GtkVScroll( float value, unsigned int scroll_type )
 {
-    if (!m_targetWindow)
-        return;
+    wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 
     if (m_yScrollPixelsPerLine == 0)
         return;
@@ -585,8 +585,7 @@ void wxScrolledWindow::GtkVScroll( float value, unsigned int scroll_type )
 
 void wxScrolledWindow::GtkHScroll( float value, unsigned int scroll_type )
 {
-    if (!m_targetWindow)
-        return;
+    wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
 
     if (m_xScrollPixelsPerLine == 0)
         return;
@@ -609,28 +608,6 @@ void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
     m_yScrollingEnabled = y_scroll;
 }
 
-void wxScrolledWindow::GetVirtualSize (int *x, int *y) const
-{
-    wxSize sz(0, 0);
-    if (m_targetWindow)
-        sz = m_targetWindow->GetClientSize();
-
-    if ( x )
-    {
-        if (m_xScrollPixelsPerLine == 0)
-            *x = sz.x;
-        else
-            *x = m_xScrollPixelsPerLine * m_xScrollLines;
-    }
-    if ( y )
-    {
-        if (m_yScrollPixelsPerLine == 0)
-            *y = sz.y;
-        else
-            *y = m_yScrollPixelsPerLine * m_yScrollLines;
-    }
-}
-
 // Where the current view starts from
 void wxScrolledWindow::GetViewStart (int *x, int *y) const
 {
@@ -672,9 +649,9 @@ int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
     if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
     {
             if (orient == wxHORIZONTAL)
-                nScrollInc = m_xScrollLines - m_xScrollPosition;
+                nScrollInc = GetVirtualSize().GetWidth() / m_xScrollPixelsPerLine - m_xScrollPosition;
             else
-                nScrollInc = m_yScrollLines - m_yScrollPosition;
+                nScrollInc = GetVirtualSize().GetHeight() / m_yScrollPixelsPerLine - m_yScrollPosition;
     } else
     if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
     {
@@ -813,12 +790,13 @@ void wxScrolledWindow::GtkVDisconnectEvent()
         (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
 }
 
-
 bool wxScrolledWindow::Layout()
 {
-    if (GetSizer())
+    if (GetSizer() && m_targetWindow == this)
     {
-        // Take into account the virtual size and scrolled position of the window
+        // 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);
@@ -836,12 +814,15 @@ bool wxScrolledWindow::Layout()
 // Default OnSize resets scrollbars, if any
 void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
 {
+    if( m_targetWindow != this )
+        m_targetWindow->SetVirtualSize( m_targetWindow->GetClientSize() );
+
+    SetVirtualSize( GetClientSize() );
+
 #if wxUSE_CONSTRAINTS
     if (GetAutoLayout())
         Layout();
 #endif
-
-    AdjustScrollbars();
 }
 
 // This calls OnDraw, having adjusted the origin according to the current
@@ -955,3 +936,5 @@ void wxScrolledWindow::OnChar(wxKeyEvent& event)
     }
 }
 
+
+// vi:sts=4:sw=4:et
diff --git a/src/msw/textctrl.cpp b/src/msw/textctrl.cpp
index 1a0b6c5f40..2e7893955d 100644
--- a/src/msw/textctrl.cpp
+++ b/src/msw/textctrl.cpp
@@ -701,8 +701,8 @@ bool wxTextCtrl::EmulateKeyPress(const wxKeyEvent& event)
     size_t lenOld = GetValue().length();
 
     wxUint32 code = event.GetRawKeyCode();
-    ::keybd_event(code, 0, 0 /* key press */, NULL);
-    ::keybd_event(code, 0, KEYEVENTF_KEYUP, NULL);
+    ::keybd_event(code, 0, 0 /* key press */, 0);
+    ::keybd_event(code, 0, KEYEVENTF_KEYUP, 0);
 
     // assume that any alphanumeric key changes the total number of characters
     // in the control - this should work in 99% of cases
-- 
2.50.0

