X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/bfe35776254b50981742c789c73aff0af03e6de2..2e14066008229145e2da7b9f05a478ce38631f83:/src/gtk1/scrolwin.cpp

diff --git a/src/gtk1/scrolwin.cpp b/src/gtk1/scrolwin.cpp
index 8a302f507b..b265c36fe1 100644
--- a/src/gtk1/scrolwin.cpp
+++ b/src/gtk1/scrolwin.cpp
@@ -1,11 +1,12 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        gtk/scrolwin.cpp
+// Name:        src/gtk1/scrolwin.cpp
 // Purpose:     wxScrolledWindow implementation
-// Author:      Julian Smart
+// Author:      Robert Roebling
 // Modified by: Ron Lee
+//              Vadim Zeitlin: removed 90% of duplicated common code
 // Created:     01/02/97
 // RCS-ID:      $Id$
-// Copyright:   (c) Julian Smart
+// Copyright:   (c) Robert Roebling
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
@@ -17,10 +18,6 @@
 // headers
 // ----------------------------------------------------------------------------
 
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-    #pragma implementation "scrolwin.h"
-#endif
-
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
@@ -28,335 +25,42 @@
     #pragma hdrstop
 #endif
 
-#include "wx/utils.h"
-#include "wx/dcclient.h"
-
 #include "wx/scrolwin.h"
-#include "wx/panel.h"
-#include "wx/sizer.h"
-
-#include "wx/gtk/private.h"
-#include "wx/gtk/win_gtk.h"
-
-// ----------------------------------------------------------------------------
-// event tables
-// ----------------------------------------------------------------------------
-
-BEGIN_EVENT_TABLE(wxScrolledWindow, wxPanel)
-    EVT_SCROLLWIN(wxScrolledWindow::OnScroll)
-    EVT_SIZE(wxScrolledWindow::OnSize)
-    EVT_PAINT(wxScrolledWindow::OnPaint)
-    EVT_CHAR(wxScrolledWindow::OnChar)
-END_EVENT_TABLE()
-
-IMPLEMENT_DYNAMIC_CLASS(wxScrolledWindow, wxPanel)
+#include "wx/gtk1/private.h"
 
 // ============================================================================
 // implementation
 // ============================================================================
 
-//-----------------------------------------------------------------------------
-// data
-//-----------------------------------------------------------------------------
-
-extern bool       g_blockEventsOnDrag;
-extern bool       g_blockEventsOnScroll;
-
-//-----------------------------------------------------------------------------
-// idle system
-//-----------------------------------------------------------------------------
-
-extern void wxapp_install_idle_handler();
-extern bool g_isIdle;
-
-//-----------------------------------------------------------------------------
-// "value_changed" from m_vAdjust
-//-----------------------------------------------------------------------------
-
-static void gtk_scrolled_window_vscroll_callback( GtkAdjustment *adjust,
-                                                  SCROLLBAR_CBACK_ARG
-                                                  wxScrolledWindow *win )
-{
-    if (g_isIdle)
-        wxapp_install_idle_handler();
-
-    if (g_blockEventsOnDrag) return;
-
-    if (!win->m_hasVMT) return;
-
-    win->GtkVScroll( adjust->value,
-            GET_SCROLL_TYPE(GTK_SCROLLED_WINDOW(win->m_widget)->vscrollbar) );
-}
-
-//-----------------------------------------------------------------------------
-// "value_changed" from m_hAdjust
-//-----------------------------------------------------------------------------
-
-static void gtk_scrolled_window_hscroll_callback( GtkAdjustment *adjust,
-                                                  SCROLLBAR_CBACK_ARG
-                                                  wxScrolledWindow *win )
-{
-    if (g_isIdle)
-        wxapp_install_idle_handler();
-
-    if (g_blockEventsOnDrag) return;
-    if (!win->m_hasVMT) return;
-
-    win->GtkHScroll( adjust->value,
-            GET_SCROLL_TYPE(GTK_SCROLLED_WINDOW(win->m_widget)->hscrollbar) );
-}
-
-//-----------------------------------------------------------------------------
-// "button_press_event" from scrollbar
-//-----------------------------------------------------------------------------
-
-static gint gtk_scrollbar_button_press_callback( GtkRange *widget,
-                                                 GdkEventButton *gdk_event,
-                                                 wxWindowGTK *win)
-{
-    if (g_isIdle)
-        wxapp_install_idle_handler();
-
-    g_blockEventsOnScroll = TRUE;
-
-    // FIXME: there is no slider field any more, what was meant here?
-#ifndef __WXGTK20__
-    win->m_isScrolling = (gdk_event->window == widget->slider);
-#endif
-
-    return FALSE;
-}
-
-//-----------------------------------------------------------------------------
-// "button_release_event" from scrollbar
-//-----------------------------------------------------------------------------
-
-static gint gtk_scrollbar_button_release_callback( GtkRange *widget,
-                                                   GdkEventButton *WXUNUSED(gdk_event),
-                                                   wxWindowGTK *win)
-{
-//  don't test here as we can release the mouse while being over
-//  a different window than the slider
-//
-//    if (gdk_event->window != widget->slider) return FALSE;
-
-    g_blockEventsOnScroll = FALSE;
-
-    if (win->m_isScrolling)
-    {
-        wxEventType command = wxEVT_SCROLLWIN_THUMBRELEASE;
-        int value = -1;
-        int dir = -1;
-
-        GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(win->m_widget);
-        if (widget == GTK_RANGE(scrolledWindow->hscrollbar))
-        {
-            value = (int)(win->m_hAdjust->value+0.5);
-            dir = wxHORIZONTAL;
-        }
-        if (widget == GTK_RANGE(scrolledWindow->vscrollbar))
-        {
-            value = (int)(win->m_vAdjust->value+0.5);
-            dir = wxVERTICAL;
-        }
-
-        wxScrollWinEvent event( command, value, dir );
-        event.SetEventObject( win );
-        win->GetEventHandler()->ProcessEvent( event );
-    }
-
-    win->m_isScrolling = FALSE;
-
-    return FALSE;
-}
-
-//-----------------------------------------------------------------------------
-// InsertChild for wxScrolledWindow
-//-----------------------------------------------------------------------------
-
-static void wxInsertChildInScrolledWindow( wxWindow* parent, wxWindow* child )
-{
-    // The window might have been scrolled already, do we
-    // have to adapt the position.
-    GtkPizza *pizza = GTK_PIZZA(parent->m_wxwindow);
-    child->m_x += pizza->xoffset;
-    child->m_y += pizza->yoffset;
-
-    gtk_pizza_put( GTK_PIZZA(parent->m_wxwindow),
-                     GTK_WIDGET(child->m_widget),
-                     child->m_x,
-                     child->m_y,
-                     child->m_width,
-                     child->m_height );
-}
-
-// ----------------------------------------------------------------------------
-// wxScrolledWindow creation
-// ----------------------------------------------------------------------------
-
-void wxScrolledWindow::Init()
-{
-    m_xScrollPixelsPerLine = 0;
-    m_yScrollPixelsPerLine = 0;
-    m_xScrollingEnabled = TRUE;
-    m_yScrollingEnabled = TRUE;
-    m_xScrollPosition = 0;
-    m_yScrollPosition = 0;
-    m_xScrollLinesPerPage = 0;
-    m_yScrollLinesPerPage = 0;
-    m_targetWindow = (wxWindow*) NULL;
-    m_scaleX = 1.0;
-    m_scaleY = 1.0;
-    m_hasScrolling = TRUE;
-}
-
-bool wxScrolledWindow::Create(wxWindow *parent,
-                              wxWindowID id,
-                              const wxPoint& pos,
-                              const wxSize& size,
-                              long style,
-                              const wxString& name)
-{
-    Init();
-
-    if (!PreCreation( parent, pos, size ) ||
-        !CreateBase( parent, id, pos, size, style, wxDefaultValidator, name ))
-    {
-        wxFAIL_MSG( wxT("wxWindow creation failed") );
-        return FALSE;
-    }
-
-    m_insertCallback = wxInsertChildInScrolledWindow;
-
-    m_targetWindow = this;
-
-    m_widget = gtk_scrolled_window_new( (GtkAdjustment *) NULL, (GtkAdjustment *) NULL );
-    GTK_WIDGET_UNSET_FLAGS( m_widget, GTK_CAN_FOCUS );
-
-    GtkScrolledWindow *scrolledWindow = GTK_SCROLLED_WINDOW(m_widget);
-
-    GtkScrolledWindowClass *scroll_class = GTK_SCROLLED_WINDOW_CLASS( GTK_OBJECT_GET_CLASS(m_widget) );
-    scroll_class->scrollbar_spacing = 0;
-
-    gtk_scrolled_window_set_policy( scrolledWindow, GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC );
-
-    m_hAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->hscrollbar) );
-    m_vAdjust = gtk_range_get_adjustment( GTK_RANGE(scrolledWindow->vscrollbar) );
-
-    m_wxwindow = gtk_pizza_new();
-
-    gtk_container_add( GTK_CONTAINER(m_widget), m_wxwindow );
-
-    GtkPizza *pizza = GTK_PIZZA(m_wxwindow);
-
-    if (HasFlag(wxRAISED_BORDER))
-    {
-        gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_OUT );
-    }
-    else if (HasFlag(wxSUNKEN_BORDER))
-    {
-        gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_IN );
-    }
-    else if (HasFlag(wxSIMPLE_BORDER))
-    {
-        gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_THIN );
-    }
-    else
-    {
-        gtk_pizza_set_shadow_type( pizza, GTK_MYSHADOW_NONE );
-    }
-
-    GTK_WIDGET_SET_FLAGS( m_wxwindow, GTK_CAN_FOCUS );
-    m_acceptsFocus = TRUE;
-
-    // I _really_ don't want scrollbars in the beginning
-    m_vAdjust->lower = 0.0;
-    m_vAdjust->upper = 1.0;
-    m_vAdjust->value = 0.0;
-    m_vAdjust->step_increment = 1.0;
-    m_vAdjust->page_increment = 2.0;
-    gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
-    m_hAdjust->lower = 0.0;
-    m_hAdjust->upper = 1.0;
-    m_hAdjust->value = 0.0;
-    m_hAdjust->step_increment = 1.0;
-    m_hAdjust->page_increment = 2.0;
-    gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
-
-    // Handlers for new scrollbar values
-    GtkVConnectEvent();
-    GtkHConnectEvent();
-
-    // these handlers block mouse events to any window during scrolling such as
-    // motion events and prevent GTK and wxWindows from fighting over where the
-    // slider should be
-
-    gtk_signal_connect( GTK_OBJECT(scrolledWindow->vscrollbar), "button_press_event",
-          (GtkSignalFunc)gtk_scrollbar_button_press_callback, (gpointer) this );
-
-    gtk_signal_connect( GTK_OBJECT(scrolledWindow->hscrollbar), "button_press_event",
-          (GtkSignalFunc)gtk_scrollbar_button_press_callback, (gpointer) this );
-
-    gtk_signal_connect( GTK_OBJECT(scrolledWindow->vscrollbar), "button_release_event",
-          (GtkSignalFunc)gtk_scrollbar_button_release_callback, (gpointer) this );
-
-    gtk_signal_connect( GTK_OBJECT(scrolledWindow->hscrollbar), "button_release_event",
-          (GtkSignalFunc)gtk_scrollbar_button_release_callback, (gpointer) this );
-
-    gtk_widget_show( m_wxwindow );
-
-    if (m_parent)
-        m_parent->DoAddChild( this );
-
-    m_focusWidget = m_wxwindow;
-
-    PostCreation();
-
-    Show( TRUE );
-    
-    return TRUE;
-}
-
 // ----------------------------------------------------------------------------
-// setting scrolling parameters
+// wxScrollHelper implementation
 // ----------------------------------------------------------------------------
 
-void wxScrolledWindow::DoSetVirtualSize( int x, int y )
-{
-    wxPanel::DoSetVirtualSize( x, y );
-    AdjustScrollbars();
-
-#if wxUSE_CONSTRAINTS
-    if (GetAutoLayout())
-        Layout();
-#endif
-}
-
-/*
- * 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 wxScrollHelper::SetScrollbars(int pixelsPerUnitX, int pixelsPerUnitY,
+                                         int noUnitsX, int noUnitsY,
+                                         int xPos, int yPos,
+                                         bool noRefresh)
 {
     int xs, ys;
-    GetViewStart (& xs, & ys);
-    
+    GetViewStart(& xs, & ys);
+
     int old_x = m_xScrollPixelsPerLine * xs;
     int old_y = m_yScrollPixelsPerLine * ys;
 
     m_xScrollPixelsPerLine = pixelsPerUnitX;
     m_yScrollPixelsPerLine = pixelsPerUnitY;
 
-    m_hAdjust->value = m_xScrollPosition = xPos;
-    m_vAdjust->value = m_yScrollPosition = yPos;
+    m_win->m_hAdjust->value = m_xScrollPosition = xPos;
+    m_win->m_vAdjust->value = m_yScrollPosition = yPos;
 
     // Setting hints here should arguably be deprecated, but without it
     // a sizer might override this manual scrollbar setting in old code.
-    m_targetWindow->SetVirtualSizeHints( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
+    // m_targetWindow->SetVirtualSizeHints( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
 
-    m_targetWindow->SetVirtualSize( noUnitsX * pixelsPerUnitX, noUnitsY * pixelsPerUnitY );
+    int w = noUnitsX * pixelsPerUnitX;
+    int h = noUnitsY * pixelsPerUnitY;
+    m_targetWindow->SetVirtualSize( w ? w : wxDefaultCoord,
+                                    h ? h : wxDefaultCoord);
 
     if (!noRefresh)
     {
@@ -365,613 +69,119 @@ void wxScrolledWindow::SetScrollbars( int pixelsPerUnitX, int pixelsPerUnitY,
 
         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)
-    {
-        m_hAdjust->upper = 1.0;
-        m_hAdjust->page_size = 1.0;
-    }
-    else
-    {
-        m_hAdjust->upper = vw / m_xScrollPixelsPerLine;
-        m_hAdjust->page_size = (w / m_xScrollPixelsPerLine);
-
-        // If the scrollbar hits the right side, move the window
-        // right to keep it from over extending.
-
-        if ((m_hAdjust->value != 0.0) && (m_hAdjust->value + m_hAdjust->page_size > m_hAdjust->upper))
-        {
-            m_hAdjust->value = m_hAdjust->upper - m_hAdjust->page_size;
-            if (m_hAdjust->value < 0.0)
-                m_hAdjust->value = 0.0;
-                
-            if (GetChildren().GetCount() == 0)
-                m_xScrollPosition = (int)m_hAdjust->value; // This is enough without child windows
-            else
-                gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" ); // Actually scroll window
-        }
-    }
-
-    if (m_yScrollPixelsPerLine == 0)
-    {
-        m_vAdjust->upper = 1.0;
-        m_vAdjust->page_size = 1.0;
-    }
-    else
-    {
-        m_vAdjust->upper = vh / m_yScrollPixelsPerLine;
-        m_vAdjust->page_size = (h / m_yScrollPixelsPerLine);
-
-        if ((m_vAdjust->value != 0.0) && (m_vAdjust->value + m_vAdjust->page_size > m_vAdjust->upper))
-        {
-            m_vAdjust->value = m_vAdjust->upper - m_vAdjust->page_size;
-            if (m_vAdjust->value < 0.0)
-                m_vAdjust->value = 0.0;
-                
-            if (GetChildren().GetCount() == 0)
-                m_yScrollPosition = (int)m_vAdjust->value;  
-            else
-                gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
-        }
-    }
-
-    m_xScrollLinesPerPage = (int)(m_hAdjust->page_size + 0.5);
-    m_yScrollLinesPerPage = (int)(m_vAdjust->page_size + 0.5);
-
-    gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "changed" );
-    gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "changed" );
-}
-
-
-// ----------------------------------------------------------------------------
-// target window handling
-// ----------------------------------------------------------------------------
-
-void wxScrolledWindow::SetTargetWindow( wxWindow *target, bool WXUNUSED(pushEventHandler) )
-{
-    wxASSERT_MSG( target, wxT("target window must not be NULL") );
-    m_targetWindow = target;
-}
-
-wxWindow *wxScrolledWindow::GetTargetWindow() const
-{
-    return m_targetWindow;
-}
-
-// Override this function if you don't want to have wxScrolledWindow
-// automatically change the origin according to the scroll position.
-void wxScrolledWindow::PrepareDC(wxDC& dc)
-{
-    dc.SetDeviceOrigin( -m_xScrollPosition * m_xScrollPixelsPerLine,
-                        -m_yScrollPosition * m_yScrollPixelsPerLine );
-}
-
-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();
+    m_targetWindow->m_hasScrolling = pixelsPerUnitX || pixelsPerUnitY;
 }
 
-void wxScrolledWindow::GetScrollPixelsPerUnit (int *x_unit, int *y_unit) const
+void wxScrollHelper::DoAdjustScrollbar(GtkAdjustment *adj,
+                                             int pixelsPerLine,
+                                             int winSize,
+                                             int virtSize,
+                                             int *pos,
+                                             int *lines,
+                                             int *linesPerPage)
 {
-    if ( x_unit )
-        *x_unit = m_xScrollPixelsPerLine;
-    if ( y_unit )
-        *y_unit = m_yScrollPixelsPerLine;
-}
-
-int wxScrolledWindow::GetScrollPageSize(int orient) const
-{
-    if ( orient == wxHORIZONTAL )
-        return m_xScrollLinesPerPage;
-    else
-        return m_yScrollLinesPerPage;
-}
-
-void wxScrolledWindow::SetScrollPageSize(int orient, int pageSize)
-{
-    if ( orient == wxHORIZONTAL )
-        m_xScrollLinesPerPage = pageSize;
-    else
-        m_yScrollLinesPerPage = pageSize;
-}
-
-void wxScrolledWindow::OnScroll(wxScrollWinEvent& event)
-{
-    int orient = event.GetOrientation();
-
-    int nScrollInc = CalcScrollInc(event);
-    if (nScrollInc == 0) return;
-
-    if (orient == wxHORIZONTAL)
+    if ( pixelsPerLine == 0 )
     {
-        int newPos = m_xScrollPosition + nScrollInc;
-        SetScrollPos(wxHORIZONTAL, newPos, TRUE );
+        adj->upper = 1.0;
+        adj->page_increment = 1.0;
+        adj->page_size = 1.0;
     }
-    else
+    else // we do have scrollbar
     {
-        int newPos = m_yScrollPosition + nScrollInc;
-        SetScrollPos(wxVERTICAL, newPos, TRUE );
-    }
+        adj->upper = (virtSize + pixelsPerLine - 1) / pixelsPerLine;
+        adj->page_size = winSize / pixelsPerLine;
+        adj->page_increment = winSize / pixelsPerLine;
 
-    if (orient == wxHORIZONTAL)
-    {
-        m_xScrollPosition += nScrollInc;
-    }
-    else
-    {
-        m_yScrollPosition += nScrollInc;
-    }
+        // Special case. When client and virtual size are very close but
+        // the client is big enough, kill scrollbar.
 
-    if (orient == wxHORIZONTAL)
-    {
-       if (m_xScrollingEnabled)
-            m_targetWindow->ScrollWindow(-m_xScrollPixelsPerLine * nScrollInc, 0, (const wxRect *) NULL);
-       else
-            m_targetWindow->Refresh();
-    }
-    else
-    {
-        if (m_yScrollingEnabled)
-            m_targetWindow->ScrollWindow(0, -m_yScrollPixelsPerLine * nScrollInc, (const wxRect *) NULL);
-        else
-            m_targetWindow->Refresh();
-    }
-}
-
-void wxScrolledWindow::Scroll( int x_pos, int y_pos )
-{
-    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;
-
-    if ((x_pos != -1) && (m_xScrollPixelsPerLine))
-    {
-        int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
-        if (max < 0) max = 0;
-        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;
-
-        m_targetWindow->ScrollWindow( (old_x-m_xScrollPosition)*m_xScrollPixelsPerLine, 0 );
-
-        // Just update the scrollbar, don't send any wxWindows event
-        GtkHDisconnectEvent();
-        gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
-        GtkHConnectEvent();
-    }
+        if ((adj->page_size < adj->upper) && (winSize >= virtSize))
+            adj->page_size += 1.0;
 
-    if ((y_pos != -1) && (m_yScrollPixelsPerLine))
-    {
-        int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
-        if (max < 0) max = 0;
-        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;
-
-        m_targetWindow->ScrollWindow( 0, (old_y-m_yScrollPosition)*m_yScrollPixelsPerLine );
-
-        // Just update the scrollbar, don't send any wxWindows event
-        GtkVDisconnectEvent();
-        gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
-        GtkVConnectEvent();
-    }
-}
-
-// TODO: [VH]Scroll functions should be combined
-
-void wxScrolledWindow::GtkVScroll( float value, unsigned int scroll_type )
-{
-    wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
-
-    if (m_yScrollPixelsPerLine == 0)
-        return;
-
-    int y_pos = (int)(value+0.5);
-
-    if (y_pos == m_yScrollPosition)
-        return;
-
-    wxEventType command = GtkScrollWinTypeToWx(scroll_type);
-
-    wxScrollWinEvent event( command, y_pos, wxVERTICAL );
-    event.SetEventObject( this );
-    GetEventHandler()->ProcessEvent( event );
-}
-
-void wxScrolledWindow::GtkHScroll( float value, unsigned int scroll_type )
-{
-    wxASSERT_MSG( m_targetWindow != 0, _T("No target window") );
-
-    if (m_xScrollPixelsPerLine == 0)
-        return;
-
-    int x_pos = (int)(value+0.5);
-
-    if (x_pos == m_xScrollPosition)
-        return;
-
-    wxEventType command = GtkScrollWinTypeToWx(scroll_type);
-
-    wxScrollWinEvent event( command, x_pos, wxHORIZONTAL );
-    event.SetEventObject( this );
-    GetEventHandler()->ProcessEvent( event );
-}
-
-void wxScrolledWindow::EnableScrolling (bool x_scroll, bool y_scroll)
-{
-    m_xScrollingEnabled = x_scroll;
-    m_yScrollingEnabled = y_scroll;
-}
-
-// Where the current view starts from
-void wxScrolledWindow::GetViewStart (int *x, int *y) const
-{
-    if ( x )
-        *x = m_xScrollPosition;
-    if ( y )
-        *y = m_yScrollPosition;
-}
-
-void wxScrolledWindow::DoCalcScrolledPosition(int x, int y, int *xx, int *yy) const
-{
-    int xs, ys;
-    GetViewStart (& xs, & ys);
-    
-    if ( xx )
-        *xx = x - xs * m_xScrollPixelsPerLine;
-    if ( yy )
-        *yy = y - ys * m_yScrollPixelsPerLine;
-}
-
-void wxScrolledWindow::DoCalcUnscrolledPosition(int x, int y, int *xx, int *yy) const
-{
-    int xs, ys;
-    GetViewStart (& xs, & ys);
-    
-    if ( xx )
-        *xx = x + xs * m_xScrollPixelsPerLine;
-    if ( yy )
-        *yy = y + ys * m_yScrollPixelsPerLine;
-}
-
-int wxScrolledWindow::CalcScrollInc(wxScrollWinEvent& event)
-{
-    int pos = event.GetPosition();
-    int orient = event.GetOrientation();
-
-    int nScrollInc = 0;
-    if (event.GetEventType() == wxEVT_SCROLLWIN_TOP)
-    {
-            if (orient == wxHORIZONTAL)
-                nScrollInc = - m_xScrollPosition;
-            else
-                nScrollInc = - m_yScrollPosition;
-    } else
-    if (event.GetEventType() == wxEVT_SCROLLWIN_BOTTOM)
-    {
-            if (orient == wxHORIZONTAL)
-                nScrollInc = GetVirtualSize().GetWidth() / m_xScrollPixelsPerLine - m_xScrollPosition;
-            else
-                nScrollInc = GetVirtualSize().GetHeight() / m_yScrollPixelsPerLine - m_yScrollPosition;
-    } else
-    if (event.GetEventType() == wxEVT_SCROLLWIN_LINEUP)
-    {
-            nScrollInc = -1;
-    } else
-    if (event.GetEventType() == wxEVT_SCROLLWIN_LINEDOWN)
-    {
-            nScrollInc = 1;
-    } else
-    if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEUP)
-    {
-            if (orient == wxHORIZONTAL)
-                nScrollInc = -GetScrollPageSize(wxHORIZONTAL);
-            else
-                nScrollInc = -GetScrollPageSize(wxVERTICAL);
-    } else
-    if (event.GetEventType() == wxEVT_SCROLLWIN_PAGEDOWN)
-    {
-            if (orient == wxHORIZONTAL)
-                nScrollInc = GetScrollPageSize(wxHORIZONTAL);
-            else
-                nScrollInc = GetScrollPageSize(wxVERTICAL);
-    } else
-    if ((event.GetEventType() == wxEVT_SCROLLWIN_THUMBTRACK) ||
-        (event.GetEventType() == wxEVT_SCROLLWIN_THUMBRELEASE))
-    {
-            if (orient == wxHORIZONTAL)
-                nScrollInc = pos - m_xScrollPosition;
-            else
-                nScrollInc = pos - m_yScrollPosition;
-    }
-
-    if (orient == wxHORIZONTAL)
-    {
-        if (m_xScrollPixelsPerLine > 0)
-        {
-            int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
-            if (max < 0) max = 0;
-
-            if ( (m_xScrollPosition + nScrollInc) < 0 )
-                nScrollInc = -m_xScrollPosition; // As -ve as we can go
-            else if ( (m_xScrollPosition + nScrollInc) > max )
-                nScrollInc = max - m_xScrollPosition; // As +ve as we can go
-        }
-        else
-            m_targetWindow->Refresh();
-    }
-    else
-    {
-        if (m_yScrollPixelsPerLine > 0)
-        {
-            int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
-            if (max < 0) max = 0;
-
-            if ( (m_yScrollPosition + nScrollInc) < 0 )
-                nScrollInc = -m_yScrollPosition; // As -ve as we can go
-            else if ( (m_yScrollPosition + nScrollInc) > max )
-                nScrollInc = max - m_yScrollPosition; // As +ve as we can go
-        }
-        else
-            m_targetWindow->Refresh();
-    }
-
-    return nScrollInc;
-}
-
-void wxScrolledWindow::SetScrollPos( int orient, int pos, bool refresh )
-{
-    wxCHECK_RET( m_widget != NULL, wxT("invalid window") );
-
-    wxCHECK_RET( m_wxwindow != NULL, wxT("window needs client area for scrolling") );
-
-    if (orient == wxHORIZONTAL)
-    {
-        int max = (int)(m_hAdjust->upper - m_hAdjust->page_size + 0.5);
-        if (max < 0) max = 0;
-
-        if (pos > max) pos = 0;
-        if (pos < 0) pos = 0;
-
-        if (pos == (int)(m_hAdjust->value+0.5)) return;
-        m_hAdjust->value = pos;
-    }
-    else
-    {
-        int max = (int)(m_vAdjust->upper - m_vAdjust->page_size + 0.5);
-        if (max < 0) max = 0;
-
-        if (pos > max) pos = 0;
-        if (pos < 0) pos = 0;
-
-        if (pos == (int)(m_vAdjust->value+0.5)) return;
-        m_vAdjust->value = pos;
-    }
+        // If the scrollbar hits the right side, move the window
+        // right to keep it from over extending.
 
-    if (m_wxwindow->window)
-    {
-        if (orient == wxHORIZONTAL)
+        if ( !wxIsNullDouble(adj->value) &&
+                (adj->value + adj->page_size > adj->upper) )
         {
-            // Just update the scrollbar, don't send any wxWindows event
-            GtkHDisconnectEvent();
-            gtk_signal_emit_by_name( GTK_OBJECT(m_hAdjust), "value_changed" );
-            GtkHConnectEvent();
-        }
-        else
-        {
-            // Just update the scrollbar, don't send any wxWindows event
-            GtkVDisconnectEvent();
-            gtk_signal_emit_by_name( GTK_OBJECT(m_vAdjust), "value_changed" );
-            GtkVConnectEvent();
+            adj->value = adj->upper - adj->page_size;
+            if (adj->value < 0.0)
+                adj->value = 0.0;
+
+            if ( m_win->GetChildren().empty() )
+            {
+                // This is enough without child windows
+                *pos = (int)adj->value;
+            }
+            else
+            {
+                // We need to actually scroll window
+                gtk_signal_emit_by_name( GTK_OBJECT(adj), "value_changed" );
+            }
         }
     }
-}
 
-void wxScrolledWindow::GtkVConnectEvent()
-{
-    gtk_signal_connect( GTK_OBJECT(m_vAdjust), "value_changed",
-          (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
+    *lines = (int)(adj->upper + 0.5);
+    *linesPerPage = (int)(adj->page_increment + 0.5);
+    gtk_signal_emit_by_name( GTK_OBJECT(adj), "changed" );
 }
 
-void wxScrolledWindow::GtkHConnectEvent()
+void wxScrollHelper::AdjustScrollbars()
 {
-    gtk_signal_connect( GTK_OBJECT(m_hAdjust), "value_changed",
-          (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
-}
+    int w, h;
+    int vw, vh;
 
-void wxScrolledWindow::GtkHDisconnectEvent()
-{
-    gtk_signal_disconnect_by_func( GTK_OBJECT(m_hAdjust),
-        (GtkSignalFunc) gtk_scrolled_window_hscroll_callback, (gpointer) this );
-}
+    m_targetWindow->GetClientSize( &w, &h );
+    m_targetWindow->GetVirtualSize( &vw, &vh );
 
-void wxScrolledWindow::GtkVDisconnectEvent()
-{
-    gtk_signal_disconnect_by_func( GTK_OBJECT(m_vAdjust),
-        (GtkSignalFunc) gtk_scrolled_window_vscroll_callback, (gpointer) this );
+    DoAdjustScrollbar(m_win->m_hAdjust, m_xScrollPixelsPerLine, w, vw,
+                      &m_xScrollPosition, &m_xScrollLines, &m_xScrollLinesPerPage);
+    DoAdjustScrollbar(m_win->m_vAdjust, m_yScrollPixelsPerLine, h, vh,
+                      &m_yScrollPosition, &m_yScrollLines, &m_yScrollLinesPerPage);
 }
 
-bool wxScrolledWindow::Layout()
+void wxScrollHelper::DoScrollOneDir(int orient,
+                                    GtkAdjustment *adj,
+                                    int pos,
+                                    int pixelsPerLine,
+                                    int *posOld)
 {
-    if (GetSizer() && m_targetWindow == this)
+    if ( pos != -1 && pos != *posOld && pixelsPerLine )
     {
-        // If we're the scroll target, take into account the
-        // virtual size and scrolled position of the window.
-
-        int x, y, w, h;
-        CalcScrolledPosition(0,0, &x,&y);
-        GetVirtualSize(&w, &h);
-        GetSizer()->SetDimension(x, y, w, h);
-        return TRUE;
-    }
-    else
-        return wxPanel::Layout();  // fall back to default for LayoutConstraints
-}
+        int max = (int)(adj->upper - adj->page_size + 0.5);
+        if (max < 0)
+            max = 0;
+        if (pos > max)
+            pos = max;
+        if (pos < 0)
+            pos = 0;
 
-// ----------------------------------------------------------------------------
-// event handlers
-// ----------------------------------------------------------------------------
+        adj->value = pos;
 
-// Default OnSize resets scrollbars, if any
-void wxScrolledWindow::OnSize(wxSizeEvent& WXUNUSED(event))
-{
-    if( GetAutoLayout() || m_targetWindow->GetAutoLayout() )
-    {
-        if( m_targetWindow != this )
-            m_targetWindow->FitInside();
+        int diff = (*posOld - pos)*pixelsPerLine;
+        m_targetWindow->ScrollWindow(orient == wxHORIZONTAL ? diff : 0,
+                                     orient == wxHORIZONTAL ? 0 : diff);
 
-        FitInside();
+        *posOld = pos;
 
-        // 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();
-    }
-    else
-    {
-        AdjustScrollbars();
+        m_win->GtkUpdateScrollbar(orient);
     }
 }
 
-// This calls OnDraw, having adjusted the origin according to the current
-// scroll position
-void wxScrolledWindow::OnPaint(wxPaintEvent& WXUNUSED(event))
+void wxScrollHelper::DoScroll( int x_pos, int y_pos )
 {
-    wxPaintDC dc(this);
-    PrepareDC(dc);
+    wxCHECK_RET( m_targetWindow != 0, wxT("No target window") );
 
-    OnDraw(dc);
+    DoScrollOneDir(wxHORIZONTAL, m_win->m_hAdjust, x_pos, m_xScrollPixelsPerLine,
+                &m_xScrollPosition);
+    DoScrollOneDir(wxVERTICAL, m_win->m_vAdjust, y_pos, m_yScrollPixelsPerLine,
+                &m_yScrollPosition);
 }
 
-// kbd handling: notice that we use OnChar() and not OnKeyDown() for
-// compatibility here - if we used OnKeyDown(), the programs which process
-// arrows themselves in their OnChar() would never get the message and like
-// this they always have the priority
-void wxScrolledWindow::OnChar(wxKeyEvent& event)
+void wxScrollHelper::DoShowScrollbars(wxScrollbarVisibility WXUNUSED(horz),
+                                      wxScrollbarVisibility WXUNUSED(vert))
 {
-    int stx, sty,       // view origin
-        szx, szy,       // view size (total)
-        clix, cliy;     // view size (on screen)
-
-    GetViewStart(&stx, &sty);
-    GetClientSize(&clix, &cliy);
-    GetVirtualSize(&szx, &szy);
-
-    if( m_xScrollPixelsPerLine )
-    {
-        clix /= m_xScrollPixelsPerLine;
-        szx /= m_xScrollPixelsPerLine;
-    }
-    else
-    {
-        clix = 0;
-        szx = -1;
-    }
-    if( m_yScrollPixelsPerLine )
-    {
-        cliy /= m_yScrollPixelsPerLine;
-        szy /= m_yScrollPixelsPerLine;
-    }
-    else
-    {
-        cliy = 0;
-        szy = -1;
-    }
-
-    int xScrollOld = GetScrollPos(wxHORIZONTAL),
-        yScrollOld = GetScrollPos(wxVERTICAL);
-
-    int dsty;
-    switch ( event.GetKeyCode() )
-    {
-        case WXK_PAGEUP:
-        case WXK_PRIOR:
-            dsty = sty - (5 * cliy / 6);
-            Scroll(-1, (dsty == -1) ? 0 : dsty);
-            break;
-
-        case WXK_PAGEDOWN:
-        case WXK_NEXT:
-            Scroll(-1, sty + (5 * cliy / 6));
-            break;
-
-        case WXK_HOME:
-            Scroll(0, event.ControlDown() ? 0 : -1);
-            break;
-
-        case WXK_END:
-            Scroll(szx - clix, event.ControlDown() ? szy - cliy : -1);
-            break;
-
-        case WXK_UP:
-            Scroll(-1, sty - 1);
-            break;
-
-        case WXK_DOWN:
-            Scroll(-1, sty + 1);
-            break;
-
-        case WXK_LEFT:
-            Scroll(stx - 1, -1);
-            break;
-
-        case WXK_RIGHT:
-            Scroll(stx + 1, -1);
-            break;
-
-        default:
-            // not for us
-            event.Skip();
-            return;
-    }
-
-    int xScroll = GetScrollPos(wxHORIZONTAL);
-    if ( xScroll != xScrollOld )
-    {
-        wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, xScroll,
-                               wxHORIZONTAL);
-        event.SetEventObject(this);
-        GetEventHandler()->ProcessEvent(event);
-    }
-
-    int yScroll = GetScrollPos(wxVERTICAL);
-    if ( yScroll != yScrollOld )
-    {
-        wxScrollWinEvent event(wxEVT_SCROLLWIN_THUMBTRACK, yScroll,
-                               wxVERTICAL);
-        event.SetEventObject(this);
-        GetEventHandler()->ProcessEvent(event);
-    }
+    // TODO: not supported/implemented
 }
 
-
-// vi:sts=4:sw=4:et