Rewrote MDI system

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2090 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/mdi.h

@@ -65,31 +65,27 @@ class wxMDIParentFrame: public wxFrame
 
 
     void GetClientSize(int *width, int *height) const;
-    wxMDIChildFrame *GetActiveChild(void) const;
+    wxMDIChildFrame *GetActiveChild() const;
     
-    wxMDIClientWindow *GetClientWindow(void) const; 
+    wxMDIClientWindow *GetClientWindow() const; 
-    virtual wxMDIClientWindow *OnCreateClient(void);
+    virtual wxMDIClientWindow *OnCreateClient();
   
-    virtual void Cascade(void) {};
+    virtual void Cascade() {}
-    virtual void Tile(void) {};
+    virtual void Tile() {}
-    virtual void ArrangeIcons(void) {};
+    virtual void ArrangeIcons() {}
-    virtual void ActivateNext(void);
+    virtual void ActivateNext();
-    virtual void ActivatePrevious(void);
+    virtual void ActivatePrevious();
 
     void OnActivate( wxActivateEvent& event );
     void OnSysColourChanged( wxSysColourChangedEvent& event );
     
   // implementation
 
-    wxMDIChildFrame                *m_currentChild;
-    
-    void SetMDIMenuBar( wxMenuBar *menu_bar );
-    virtual void GtkOnSize( int x, int y, int width, int height );
-    
- private:
- 
     wxMDIClientWindow  *m_clientWindow;
-    bool                            m_parentFrameActive;
+    bool                m_justInserted;
+
+    virtual void GtkOnSize( int x, int y, int width, int height );
+    virtual void OnInternalIdle();
     
   DECLARE_EVENT_TABLE()    
 };
@@ -104,7 +100,7 @@ class wxMDIChildFrame: public wxFrame
   
   public:
 
-    wxMDIChildFrame(void);
+    wxMDIChildFrame();
     wxMDIChildFrame( wxMDIParentFrame *parent,
       wxWindowID id, const wxString& title,
       const wxPoint& pos = wxDefaultPosition, const wxSize& size = wxDefaultSize,
@@ -121,7 +117,7 @@ class wxMDIChildFrame: public wxFrame
   virtual void GetClientSize( int *width, int *height ) const;
   virtual void AddChild( wxWindow *child );
 
-  virtual void Activate(void);
+  virtual void Activate();
     
     // no status bars
   virtual wxStatusBar* CreateStatusBar( int WXUNUSED(number)=1, long WXUNUSED(style)=1, 
@@ -151,17 +147,15 @@ class wxMDIChildFrame: public wxFrame
   
     // no maximize etc
   virtual void Maximize( bool WXUNUSED(maximize) ) {}
-  virtual void Restore(void) {}
+  virtual void Restore() {}
     
   void OnActivate( wxActivateEvent &event );
     
-  public:
+  // implementation
   
     wxMenuBar         *m_menuBar;
-    
-//  private:
-  
     GtkNotebookPage   *m_page;
+    bool               m_justInserted;
     
   DECLARE_EVENT_TABLE()    
 };

include/wx/gtk/window.h

@@ -405,14 +405,15 @@ public:
 
     bool HasVMT();
 
-    /* I don't want users to override what's done in OnIdle */
+    /* I don't want users to override what's done in idle so everything that
+       has to be done in idle time in order for wxGTK to work is done in
+       OnInternalIdle */
     virtual void OnInternalIdle();
 
     /* For compatibility across platforms (not in event table) */
     void OnIdle(wxIdleEvent& WXUNUSED(event)) {};
 
     /* used by all classes in the widget creation process */
-
     void PreCreation( wxWindow *parent, wxWindowID id, const wxPoint &pos,
             const wxSize &size, long style, const wxString &name );
     void PostCreation();

include/wx/gtk1/mdi.h

@@ -65,31 +65,27 @@ class wxMDIParentFrame: public wxFrame
 
 
     void GetClientSize(int *width, int *height) const;
-    wxMDIChildFrame *GetActiveChild(void) const;
+    wxMDIChildFrame *GetActiveChild() const;
     
-    wxMDIClientWindow *GetClientWindow(void) const; 
+    wxMDIClientWindow *GetClientWindow() const; 
-    virtual wxMDIClientWindow *OnCreateClient(void);
+    virtual wxMDIClientWindow *OnCreateClient();
   
-    virtual void Cascade(void) {};
+    virtual void Cascade() {}
-    virtual void Tile(void) {};
+    virtual void Tile() {}
-    virtual void ArrangeIcons(void) {};
+    virtual void ArrangeIcons() {}
-    virtual void ActivateNext(void);
+    virtual void ActivateNext();
-    virtual void ActivatePrevious(void);
+    virtual void ActivatePrevious();
 
     void OnActivate( wxActivateEvent& event );
     void OnSysColourChanged( wxSysColourChangedEvent& event );
     
   // implementation
 
-    wxMDIChildFrame                *m_currentChild;
-    
-    void SetMDIMenuBar( wxMenuBar *menu_bar );
-    virtual void GtkOnSize( int x, int y, int width, int height );
-    
- private:
- 
     wxMDIClientWindow  *m_clientWindow;
-    bool                            m_parentFrameActive;
+    bool                m_justInserted;
+
+    virtual void GtkOnSize( int x, int y, int width, int height );
+    virtual void OnInternalIdle();
     
   DECLARE_EVENT_TABLE()    
 };
@@ -104,7 +100,7 @@ class wxMDIChildFrame: public wxFrame
   
   public:
 
-    wxMDIChildFrame(void);
+    wxMDIChildFrame();
     wxMDIChildFrame( wxMDIParentFrame *parent,
       wxWindowID id, const wxString& title,
       const wxPoint& pos = wxDefaultPosition, const wxSize& size = wxDefaultSize,
@@ -121,7 +117,7 @@ class wxMDIChildFrame: public wxFrame
   virtual void GetClientSize( int *width, int *height ) const;
   virtual void AddChild( wxWindow *child );
 
-  virtual void Activate(void);
+  virtual void Activate();
     
     // no status bars
   virtual wxStatusBar* CreateStatusBar( int WXUNUSED(number)=1, long WXUNUSED(style)=1, 
@@ -151,17 +147,15 @@ class wxMDIChildFrame: public wxFrame
   
     // no maximize etc
   virtual void Maximize( bool WXUNUSED(maximize) ) {}
-  virtual void Restore(void) {}
+  virtual void Restore() {}
     
   void OnActivate( wxActivateEvent &event );
     
-  public:
+  // implementation
   
     wxMenuBar         *m_menuBar;
-    
-//  private:
-  
     GtkNotebookPage   *m_page;
+    bool               m_justInserted;
     
   DECLARE_EVENT_TABLE()    
 };

include/wx/gtk1/window.h

@@ -405,14 +405,15 @@ public:
 
     bool HasVMT();
 
-    /* I don't want users to override what's done in OnIdle */
+    /* I don't want users to override what's done in idle so everything that
+       has to be done in idle time in order for wxGTK to work is done in
+       OnInternalIdle */
     virtual void OnInternalIdle();
 
     /* For compatibility across platforms (not in event table) */
     void OnIdle(wxIdleEvent& WXUNUSED(event)) {};
 
     /* used by all classes in the widget creation process */
-
     void PreCreation( wxWindow *parent, wxWindowID id, const wxPoint &pos,
             const wxSize &size, long style, const wxString &name );
     void PostCreation();

src/gtk/dialog.cpp

@@ -145,9 +145,10 @@ bool wxDialog::Create( wxWindow *parent,
 
     gtk_widget_realize( m_widget );
 
+    /* comments see wxFrame */
+    
     long decor = (long) GDK_DECOR_ALL;
     long func = (long) GDK_FUNC_ALL;
-      
     if ((m_windowStyle & wxCAPTION) == 0)
 	decor |= GDK_DECOR_TITLE;
     if ((m_windowStyle & wxMINIMIZE) == 0)
@@ -162,7 +163,6 @@ bool wxDialog::Create( wxWindow *parent,
 	decor |= GDK_DECOR_MAXIMIZE;
     if ((m_windowStyle & wxRESIZE_BORDER) == 0)
 	func |= GDK_FUNC_RESIZE;
-
     gdk_window_set_decorations(m_widget->window, (GdkWMDecoration)decor);
     gdk_window_set_functions(m_widget->window, (GdkWMFunction)func);
       
@@ -257,17 +257,17 @@ void wxDialog::OnCloseWindow(wxCloseEvent& event)
     // sure to destroy the dialog.
     // The default OnCancel (above) simply ends a modal dialog, and hides a modeless dialog.
 
-    static wxList closing;
+    static wxList s_closing;
 
-    if (closing.Member(this))
+    if (s_closing.Member(this))
         return;   // no loops
 
-    closing.Append(this);
+    s_closing.Append(this);
 
     wxCommandEvent cancelEvent(wxEVT_COMMAND_BUTTON_CLICKED, wxID_CANCEL);
     cancelEvent.SetEventObject( this );
     GetEventHandler()->ProcessEvent(cancelEvent);
-    closing.DeleteObject(this);
+    s_closing.DeleteObject(this);
 }
 
 bool wxDialog::Destroy()

src/gtk/frame.cpp

@@ -162,6 +162,7 @@ wxFrame::wxFrame()
     m_sizeSet = FALSE;
     m_miniEdge = 0;
     m_miniTitle = 0;
+    m_mainWidget = (GtkWidget*) NULL;
 }
 
 wxFrame::wxFrame( wxWindow *parent, wxWindowID id, const wxString &title,
@@ -175,6 +176,7 @@ wxFrame::wxFrame( wxWindow *parent, wxWindowID id, const wxString &title,
     m_sizeSet = FALSE;
     m_miniEdge = 0;
     m_miniTitle = 0;
+    m_mainWidget = (GtkWidget*) NULL;
     Create( parent, id, title, pos, size, style, name );
 }
 
@@ -200,6 +202,7 @@ bool wxFrame::Create( wxWindow *parent, wxWindowID id, const wxString &title,
     gtk_window_set_title( GTK_WINDOW(m_widget), title );
     GTK_WIDGET_UNSET_FLAGS( m_widget, GTK_CAN_FOCUS );
 
+    /* needed ? */
     gtk_window_set_policy( GTK_WINDOW(m_widget), 1, 1, 0 );
 
     gtk_signal_connect( GTK_OBJECT(m_widget), "delete_event",
@@ -224,9 +227,10 @@ bool wxFrame::Create( wxWindow *parent, wxWindowID id, const wxString &title,
 
     gtk_widget_realize( m_widget );
     
+    /* all this is for Motif Window Manager "hints" and is supposed to be
+       recognized by other WM as well. not tested. */
     long decor = (long) GDK_DECOR_ALL;
     long func = (long) GDK_FUNC_ALL;
-      
     if ((m_windowStyle & wxCAPTION) == 0)
 	decor |= GDK_DECOR_TITLE;
     if ((m_windowStyle & wxMINIMIZE) == 0)
@@ -241,13 +245,14 @@ bool wxFrame::Create( wxWindow *parent, wxWindowID id, const wxString &title,
 	decor |= GDK_DECOR_MAXIMIZE;
     if ((m_windowStyle & wxRESIZE_BORDER) == 0)
 	func |= GDK_FUNC_RESIZE;
-
     gdk_window_set_decorations(m_widget->window, (GdkWMDecoration)decor);
     gdk_window_set_functions(m_widget->window, (GdkWMFunction)func);
       
+    /* the user resized the frame by dragging etc. */
     gtk_signal_connect( GTK_OBJECT(m_widget), "size_allocate",
         GTK_SIGNAL_FUNC(gtk_frame_size_callback), (gpointer)this );
 
+    /* the only way to get the window size is to connect to this event */
     gtk_signal_connect( GTK_OBJECT(m_widget), "configure_event",
         GTK_SIGNAL_FUNC(gtk_frame_configure_callback), (gpointer)this );
 
@@ -308,10 +313,11 @@ void wxFrame::DoSetSize( int x, int y, int width, int height, int sizeFlags )
 {
     wxASSERT_MSG( (m_widget != NULL), "invalid frame" );
 
-    /* don't do anything for children of wxMDIChildFrame */
+    /* this shouldn't happen: wxFrame, wxMDIParentFrame and wxMDIChildFrame have m_wxwindow */
-    if (!m_wxwindow) return;
+    wxASSERT_MSG( (m_wxwindow != NULL), "invalid frame" );
     
-    if (m_resizing) return; // I don't like recursions
+    /* avoid recursions */
+    if (m_resizing) return; 
     m_resizing = TRUE;
 
     int old_x = m_x;
@@ -360,7 +366,9 @@ void wxFrame::DoSetSize( int x, int y, int width, int height, int sizeFlags )
 
     if ((m_width != old_width) || (m_height != old_height))
     {
-        /* we set the size in GtkOnSize */
+        /* we set the size in GtkOnSize, i.e. mostly the actual resizing is
+	   done either directly before the frame is shown or in idle time
+	   so that different calls to SetSize() don't lead to flicker. */
         m_sizeSet = FALSE;
     }
 
@@ -425,14 +433,28 @@ void wxFrame::GtkOnSize( int WXUNUSED(x), int WXUNUSED(y), int width, int height
     // m_x = x;
     // m_y = y;
 
+    /* avoid recursions */
     if (m_resizing) return;
     m_resizing = TRUE;
 
-    if (!m_wxwindow) return;
+    /* this shouldn't happen: wxFrame, wxMDIParentFrame and wxMDIChildFrame have m_wxwindow */
+    wxASSERT_MSG( (m_wxwindow != NULL), "invalid frame" );
     
     m_width = width;
     m_height = height;
 
+    /* space occupied by m_frameToolBar and m_frameMenuBar */
+    int client_area_y_offset = 0; 
+
+    /* wxMDIChildFrame derives from wxFrame but it _is_ a wxWindow as it uses
+       wxWindow::Create to create it's GTK equivalent. m_mainWidget is only
+       set in wxFrame::Create so it is used to check what kind of frame we
+       have here. if m_mainWidget is NULL it is a wxMDIChildFrame and so we
+       skip the part which handles m_frameMenuBar, m_frameToolBar and (most
+       importantly) m_mainWidget */
+       
+    if (m_mainWidget)
+    {
         /* check if size is in legal range */
         if ((m_minWidth != -1) && (m_width < m_minWidth)) m_width = m_minWidth;
         if ((m_minHeight != -1) && (m_height < m_minHeight)) m_height = m_minHeight;
@@ -445,8 +467,6 @@ void wxFrame::GtkOnSize( int WXUNUSED(x), int WXUNUSED(y), int width, int height
          * this hurts in the eye, but I don't want to call SetSize()
          * because I don't want to call any non-native functions here. */
      
-    int client_area_y_offset = 0; 
-
         if (m_frameMenuBar)
         {
             int xx = m_miniEdge;
@@ -484,6 +504,8 @@ void wxFrame::GtkOnSize( int WXUNUSED(x), int WXUNUSED(y), int width, int height
         }
     
         gtk_myfixed_move( GTK_MYFIXED(m_mainWidget), m_wxwindow, 0, client_area_y_offset );
+    }
+    
     gtk_widget_set_usize( m_wxwindow, m_width, m_height-client_area_y_offset );
 
     if (m_frameStatusBar)
@@ -533,8 +555,6 @@ void wxFrame::OnInternalIdle()
 
 void wxFrame::OnCloseWindow( wxCloseEvent& event )
 {
-    // close the window if it wasn't vetoed by the application
-//    if ( !event.GetVeto() ) // No, this isn't the interpretation of GetVeto.
     Destroy();
 }
 

src/gtk/mdi.cpp

@@ -33,48 +33,6 @@ const int wxMENU_HEIGHT    = 27;
 
 extern wxList wxPendingDelete;
 
-//-----------------------------------------------------------------------------
-// "size_allocate"
-//-----------------------------------------------------------------------------
-
-static void gtk_page_size_callback( GtkWidget *WXUNUSED(widget), GtkAllocation* alloc, wxWindow *win )
-{
-    if ((win->m_x == alloc->x) &&
-        (win->m_y == alloc->y) &&
-        (win->m_width == alloc->width) &&
-        (win->m_height == alloc->height) &&
-        (win->m_sizeSet))
-    {
-        return;
-    }
-
-    win->SetSize( alloc->x, alloc->y, alloc->width, alloc->height );
-}
-
-//-----------------------------------------------------------------------------
-// "switch_page"
-//-----------------------------------------------------------------------------
-
-static void gtk_page_change_callback( GtkNotebook *WXUNUSED(widget),
-                                      GtkNotebookPage *page,
-                                      gint WXUNUSED(nPage),
-                                      wxMDIClientWindow *client_win )
-{
-    wxNode *node = client_win->m_children.First();
-    while (node)
-    {
-        wxMDIChildFrame *child_frame = (wxMDIChildFrame *)node->Data();
-        if (child_frame->m_page == page)
-        {
-            wxMDIParentFrame *mdi_frame = (wxMDIParentFrame*)client_win->m_parent;
-            mdi_frame->m_currentChild = child_frame;
-            mdi_frame->SetMDIMenuBar( child_frame->m_menuBar );
-            return;
-        }
-        node = node->Next();
-    }
-}
-
 //-----------------------------------------------------------------------------
 // wxMDIParentFrame
 //-----------------------------------------------------------------------------
@@ -84,11 +42,10 @@ IMPLEMENT_DYNAMIC_CLASS(wxMDIParentFrame,wxFrame)
 BEGIN_EVENT_TABLE(wxMDIParentFrame, wxFrame)
 END_EVENT_TABLE()
 
-wxMDIParentFrame::wxMDIParentFrame(void)
+wxMDIParentFrame::wxMDIParentFrame()
 {
+    m_justInserted = FALSE;
     m_clientWindow = (wxMDIClientWindow *) NULL;
-    m_currentChild = (wxMDIChildFrame *) NULL;
-    m_parentFrameActive = TRUE;
 }
 
 wxMDIParentFrame::wxMDIParentFrame( wxWindow *parent,
@@ -96,13 +53,12 @@ wxMDIParentFrame::wxMDIParentFrame( wxWindow *parent,
       const wxPoint& pos, const wxSize& size,
       long style, const wxString& name )
 {
+    m_justInserted = FALSE;
     m_clientWindow = (wxMDIClientWindow *) NULL;
-    m_currentChild = (wxMDIChildFrame *) NULL;
-    m_parentFrameActive = TRUE;
     Create( parent, id, title, pos, size, style, name );
 }
 
-wxMDIParentFrame::~wxMDIParentFrame(void)
+wxMDIParentFrame::~wxMDIParentFrame()
 {
 }
 
@@ -122,38 +78,57 @@ void wxMDIParentFrame::GtkOnSize( int x, int y, int width, int height )
 {
     wxFrame::GtkOnSize( x, y, width, height );
     
-    if (m_mdiMenuBar)
+    wxMDIChildFrame *child_frame = GetActiveChild();
-    {
+    if (!child_frame) return;
-        m_mdiMenuBar->m_x = 0;
+    
-        m_mdiMenuBar->m_y = 0;
+    wxMenuBar *menu_bar = child_frame->m_menuBar;
-        m_mdiMenuBar->m_width = m_width;
+    if (!menu_bar) return;
-        m_mdiMenuBar->m_height = wxMENU_HEIGHT;
+    if (!menu_bar->m_widget) return;
-        gtk_myfixed_move( GTK_MYFIXED(m_wxwindow), m_mdiMenuBar->m_widget, 0, 0 );
+    
-        gtk_widget_set_usize( m_mdiMenuBar->m_widget, m_width, wxMENU_HEIGHT );
+    menu_bar->m_x = 0;
-    }
+    menu_bar->m_y = 0;
+    menu_bar->m_width = m_width;
+    menu_bar->m_height = wxMENU_HEIGHT;
+    gtk_myfixed_move( GTK_MYFIXED(m_mainWidget), menu_bar->m_widget, 0, 0 );
+    gtk_widget_set_usize( menu_bar->m_widget, m_width, wxMENU_HEIGHT );
 }
 
-void wxMDIParentFrame::SetMDIMenuBar( wxMenuBar *menu_bar )
+void wxMDIParentFrame::OnInternalIdle()
 {
-    /* hide old child menu bar */
+    /* if a an MDI child window has just been inserted
-    if (m_mdiMenuBar) m_mdiMenuBar->Show( FALSE );
+       it has to be brought to the top in idle time. we
+       simply set the last notebook page active as new
+       pages can only be appended at the end */
 
-    m_mdiMenuBar = menu_bar;
+    if (m_justInserted)
-
-    /* show and resize new menu child menu bar */
-    if (m_mdiMenuBar)
     {
-        m_mdiMenuBar->m_x = 0;
+        GtkNotebook *notebook = GTK_NOTEBOOK(m_clientWindow->m_widget);
-        m_mdiMenuBar->m_y = 0;
+	gtk_notebook_set_page( notebook, g_list_length( notebook->children ) - 1 );
-        m_mdiMenuBar->m_width = m_width;
+	
-        m_mdiMenuBar->m_height = wxMENU_HEIGHT;
+	m_justInserted = FALSE;
-        gtk_myfixed_move( GTK_MYFIXED(m_wxwindow), m_mdiMenuBar->m_widget, 0, 0 );
+	return;
-        gtk_widget_set_usize( m_mdiMenuBar->m_widget, m_width, wxMENU_HEIGHT );
+    }
-        m_mdiMenuBar->Show( TRUE );
+       
+    wxFrame::OnInternalIdle();
+
+    wxMDIChildFrame *active_child_frame = GetActiveChild();
+    
+    wxNode *node = m_clientWindow->m_children.First();
+    while (node)
+    {
+        wxMDIChildFrame *child_frame = (wxMDIChildFrame *)node->Data();
+	if (child_frame->m_menuBar)
+	{
+	    if (child_frame == active_child_frame)
+	       gtk_widget_show( child_frame->m_menuBar->m_widget );
+	    else
+	       gtk_widget_hide( child_frame->m_menuBar->m_widget );
+	}
+        node = node->Next();
     }
     
     /* show/hide parent menu bar as required */
-    if (m_frameMenuBar) m_frameMenuBar->Show( (m_mdiMenuBar == NULL) );
+    if (m_frameMenuBar) m_frameMenuBar->Show( (active_child_frame == NULL) );
 }
 
 void wxMDIParentFrame::GetClientSize(int *width, int *height ) const
@@ -161,29 +136,49 @@ void wxMDIParentFrame::GetClientSize(int *width, int *height ) const
     wxFrame::GetClientSize( width, height );
 }
 
-wxMDIChildFrame *wxMDIParentFrame::GetActiveChild(void) const
+wxMDIChildFrame *wxMDIParentFrame::GetActiveChild() const
 {
-    return m_currentChild;
+    if (!m_clientWindow) return (wxMDIChildFrame*) NULL;
+    
+    GtkNotebook *notebook = GTK_NOTEBOOK(m_clientWindow->m_widget);
+    if (!notebook) return (wxMDIChildFrame*) NULL;
+    
+    gint i = gtk_notebook_get_current_page( notebook );
+    if (i < 0) return (wxMDIChildFrame*) NULL;
+    
+    GtkNotebookPage* page = (GtkNotebookPage*) (g_list_nth(notebook->children,i)->data);
+    if (!page) return (wxMDIChildFrame*) NULL;
+    
+    wxNode *node = m_clientWindow->m_children.First();
+    while (node)
+    {
+        wxMDIChildFrame *child_frame = (wxMDIChildFrame *)node->Data();
+        if (child_frame->m_page == page)
+            return child_frame;
+        node = node->Next();
     }
     
-wxMDIClientWindow *wxMDIParentFrame::GetClientWindow(void) const
+    return (wxMDIChildFrame*) NULL;
+}
+
+wxMDIClientWindow *wxMDIParentFrame::GetClientWindow() const
 {
     return m_clientWindow;
 }
 
-wxMDIClientWindow *wxMDIParentFrame::OnCreateClient(void)
+wxMDIClientWindow *wxMDIParentFrame::OnCreateClient()
 {
     m_clientWindow = new wxMDIClientWindow( this );
     return m_clientWindow;
 }
 
-void wxMDIParentFrame::ActivateNext(void)
+void wxMDIParentFrame::ActivateNext()
 {
     if (m_clientWindow)
       gtk_notebook_next_page( GTK_NOTEBOOK(m_clientWindow->m_widget) );
 }
 
-void wxMDIParentFrame::ActivatePrevious(void)
+void wxMDIParentFrame::ActivatePrevious()
 {
     if (m_clientWindow)
       gtk_notebook_prev_page( GTK_NOTEBOOK(m_clientWindow->m_widget) );
@@ -207,7 +202,7 @@ BEGIN_EVENT_TABLE(wxMDIChildFrame, wxFrame)
     EVT_ACTIVATE(wxMDIChildFrame::OnActivate)
 END_EVENT_TABLE()
 
-wxMDIChildFrame::wxMDIChildFrame(void)
+wxMDIChildFrame::wxMDIChildFrame()
 {
     m_menuBar = (wxMenuBar *) NULL;
     m_page = (GtkNotebookPage *) NULL;
@@ -223,19 +218,11 @@ wxMDIChildFrame::wxMDIChildFrame( wxMDIParentFrame *parent,
     Create( parent, id, title, wxDefaultPosition, size, style, name );
 }
 
-wxMDIChildFrame::~wxMDIChildFrame(void)
+wxMDIChildFrame::~wxMDIChildFrame()
 {
     if (m_menuBar)
-    {
-        wxMDIParentFrame *mdi_frame = (wxMDIParentFrame*)m_parent->m_parent;
-        if (mdi_frame->m_currentChild == this)
-        {
-            mdi_frame->SetMDIMenuBar( (wxMenuBar *) NULL );
-            mdi_frame->m_currentChild = (wxMDIChildFrame *) NULL;
-        }
         delete m_menuBar;
 }
-}
 
 bool wxMDIChildFrame::Create( wxMDIParentFrame *parent,
       wxWindowID id, const wxString& title,
@@ -291,10 +278,12 @@ void wxMDIChildFrame::SetMenuBar( wxMenuBar *menu_bar )
             m_menuBar->m_parent = mdi_frame;
         }
 
-        gtk_myfixed_put( GTK_MYFIXED(mdi_frame->m_wxwindow),
+        /* the menu bar of the child window is shown in idle time as needed */
-          m_menuBar->m_widget, m_menuBar->m_x, m_menuBar->m_y );
+	gtk_widget_hide( m_menuBar->m_widget );
 
-        mdi_frame->SetMDIMenuBar( m_menuBar );
+        /* insert the invisible menu bar into the _parent_ mdi frame */
+        gtk_myfixed_put( GTK_MYFIXED(mdi_frame->m_mainWidget), m_menuBar->m_widget, 0, 0 );
+        gtk_widget_set_usize( menu_bar->m_widget, mdi_frame->m_width, wxMENU_HEIGHT );
     }
 }
 
@@ -303,7 +292,7 @@ wxMenuBar *wxMDIChildFrame::GetMenuBar() const
     return m_menuBar;
 }
 
-void wxMDIChildFrame::Activate(void)
+void wxMDIChildFrame::Activate()
 {
 }
 
@@ -311,6 +300,24 @@ void wxMDIChildFrame::OnActivate( wxActivateEvent &WXUNUSED(event) )
 {
 }
 
+//-----------------------------------------------------------------------------
+// "size_allocate"
+//-----------------------------------------------------------------------------
+
+static void gtk_page_size_callback( GtkWidget *WXUNUSED(widget), GtkAllocation* alloc, wxWindow *win )
+{
+    if ((win->m_x == alloc->x) &&
+        (win->m_y == alloc->y) &&
+        (win->m_width == alloc->width) &&
+        (win->m_height == alloc->height) &&
+        (win->m_sizeSet))
+    {
+        return;
+    }
+
+    win->SetSize( alloc->x, alloc->y, alloc->width, alloc->height );
+}
+
 //-----------------------------------------------------------------------------
 // InsertChild callback for wxMDIClientWindow
 //-----------------------------------------------------------------------------
@@ -332,9 +339,8 @@ static void wxInsertChildInMDI( wxMDIClientWindow* parent, wxMDIChildFrame* chil
 
     child->m_page = (GtkNotebookPage*) (g_list_last(notebook->children)->data);
     
-    gtk_notebook_set_page( notebook, parent->m_children.Number()-1 );
+    wxMDIParentFrame *parent_frame = (wxMDIParentFrame*) parent->m_parent;
-
+    parent_frame->m_justInserted = TRUE;
-    gtk_page_change_callback( (GtkNotebook *) NULL, child->m_page, 0, parent );
 }
 
 //-----------------------------------------------------------------------------
@@ -343,7 +349,7 @@ static void wxInsertChildInMDI( wxMDIClientWindow* parent, wxMDIChildFrame* chil
 
 IMPLEMENT_DYNAMIC_CLASS(wxMDIClientWindow,wxWindow)
 
-wxMDIClientWindow::wxMDIClientWindow(void)
+wxMDIClientWindow::wxMDIClientWindow()
 {
 }
 
@@ -352,7 +358,7 @@ wxMDIClientWindow::wxMDIClientWindow( wxMDIParentFrame *parent, long style )
     CreateClient( parent, style );
 }
 
-wxMDIClientWindow::~wxMDIClientWindow(void)
+wxMDIClientWindow::~wxMDIClientWindow()
 {
 }
 
@@ -366,9 +372,6 @@ bool wxMDIClientWindow::CreateClient( wxMDIParentFrame *parent, long style )
 
     m_widget = gtk_notebook_new();
 
-    gtk_signal_connect( GTK_OBJECT(m_widget), "switch_page",
-                        GTK_SIGNAL_FUNC(gtk_page_change_callback), (gpointer)this );
-
     gtk_notebook_set_scrollable( GTK_NOTEBOOK(m_widget), 1 );
 
     m_parent->AddChild( this );

src/gtk1/dialog.cpp

@@ -145,9 +145,10 @@ bool wxDialog::Create( wxWindow *parent,
 
     gtk_widget_realize( m_widget );
 
+    /* comments see wxFrame */
+    
     long decor = (long) GDK_DECOR_ALL;
     long func = (long) GDK_FUNC_ALL;
-      
     if ((m_windowStyle & wxCAPTION) == 0)
 	decor |= GDK_DECOR_TITLE;
     if ((m_windowStyle & wxMINIMIZE) == 0)
@@ -162,7 +163,6 @@ bool wxDialog::Create( wxWindow *parent,
 	decor |= GDK_DECOR_MAXIMIZE;
     if ((m_windowStyle & wxRESIZE_BORDER) == 0)
 	func |= GDK_FUNC_RESIZE;
-
     gdk_window_set_decorations(m_widget->window, (GdkWMDecoration)decor);
     gdk_window_set_functions(m_widget->window, (GdkWMFunction)func);
       
@@ -257,17 +257,17 @@ void wxDialog::OnCloseWindow(wxCloseEvent& event)
     // sure to destroy the dialog.
     // The default OnCancel (above) simply ends a modal dialog, and hides a modeless dialog.
 
-    static wxList closing;
+    static wxList s_closing;
 
-    if (closing.Member(this))
+    if (s_closing.Member(this))
         return;   // no loops
 
-    closing.Append(this);
+    s_closing.Append(this);
 
     wxCommandEvent cancelEvent(wxEVT_COMMAND_BUTTON_CLICKED, wxID_CANCEL);
     cancelEvent.SetEventObject( this );
     GetEventHandler()->ProcessEvent(cancelEvent);
-    closing.DeleteObject(this);
+    s_closing.DeleteObject(this);
 }
 
 bool wxDialog::Destroy()

src/gtk1/frame.cpp

@@ -162,6 +162,7 @@ wxFrame::wxFrame()
     m_sizeSet = FALSE;
     m_miniEdge = 0;
     m_miniTitle = 0;
+    m_mainWidget = (GtkWidget*) NULL;
 }
 
 wxFrame::wxFrame( wxWindow *parent, wxWindowID id, const wxString &title,
@@ -175,6 +176,7 @@ wxFrame::wxFrame( wxWindow *parent, wxWindowID id, const wxString &title,
     m_sizeSet = FALSE;
     m_miniEdge = 0;
     m_miniTitle = 0;
+    m_mainWidget = (GtkWidget*) NULL;
     Create( parent, id, title, pos, size, style, name );
 }
 
@@ -200,6 +202,7 @@ bool wxFrame::Create( wxWindow *parent, wxWindowID id, const wxString &title,
     gtk_window_set_title( GTK_WINDOW(m_widget), title );
     GTK_WIDGET_UNSET_FLAGS( m_widget, GTK_CAN_FOCUS );
 
+    /* needed ? */
     gtk_window_set_policy( GTK_WINDOW(m_widget), 1, 1, 0 );
 
     gtk_signal_connect( GTK_OBJECT(m_widget), "delete_event",
@@ -224,9 +227,10 @@ bool wxFrame::Create( wxWindow *parent, wxWindowID id, const wxString &title,
 
     gtk_widget_realize( m_widget );
     
+    /* all this is for Motif Window Manager "hints" and is supposed to be
+       recognized by other WM as well. not tested. */
     long decor = (long) GDK_DECOR_ALL;
     long func = (long) GDK_FUNC_ALL;
-      
     if ((m_windowStyle & wxCAPTION) == 0)
 	decor |= GDK_DECOR_TITLE;
     if ((m_windowStyle & wxMINIMIZE) == 0)
@@ -241,13 +245,14 @@ bool wxFrame::Create( wxWindow *parent, wxWindowID id, const wxString &title,
 	decor |= GDK_DECOR_MAXIMIZE;
     if ((m_windowStyle & wxRESIZE_BORDER) == 0)
 	func |= GDK_FUNC_RESIZE;
-
     gdk_window_set_decorations(m_widget->window, (GdkWMDecoration)decor);
     gdk_window_set_functions(m_widget->window, (GdkWMFunction)func);
       
+    /* the user resized the frame by dragging etc. */
     gtk_signal_connect( GTK_OBJECT(m_widget), "size_allocate",
         GTK_SIGNAL_FUNC(gtk_frame_size_callback), (gpointer)this );
 
+    /* the only way to get the window size is to connect to this event */
     gtk_signal_connect( GTK_OBJECT(m_widget), "configure_event",
         GTK_SIGNAL_FUNC(gtk_frame_configure_callback), (gpointer)this );
 
@@ -308,10 +313,11 @@ void wxFrame::DoSetSize( int x, int y, int width, int height, int sizeFlags )
 {
     wxASSERT_MSG( (m_widget != NULL), "invalid frame" );
 
-    /* don't do anything for children of wxMDIChildFrame */
+    /* this shouldn't happen: wxFrame, wxMDIParentFrame and wxMDIChildFrame have m_wxwindow */
-    if (!m_wxwindow) return;
+    wxASSERT_MSG( (m_wxwindow != NULL), "invalid frame" );
     
-    if (m_resizing) return; // I don't like recursions
+    /* avoid recursions */
+    if (m_resizing) return; 
     m_resizing = TRUE;
 
     int old_x = m_x;
@@ -360,7 +366,9 @@ void wxFrame::DoSetSize( int x, int y, int width, int height, int sizeFlags )
 
     if ((m_width != old_width) || (m_height != old_height))
     {
-        /* we set the size in GtkOnSize */
+        /* we set the size in GtkOnSize, i.e. mostly the actual resizing is
+	   done either directly before the frame is shown or in idle time
+	   so that different calls to SetSize() don't lead to flicker. */
         m_sizeSet = FALSE;
     }
 
@@ -425,14 +433,28 @@ void wxFrame::GtkOnSize( int WXUNUSED(x), int WXUNUSED(y), int width, int height
     // m_x = x;
     // m_y = y;
 
+    /* avoid recursions */
     if (m_resizing) return;
     m_resizing = TRUE;
 
-    if (!m_wxwindow) return;
+    /* this shouldn't happen: wxFrame, wxMDIParentFrame and wxMDIChildFrame have m_wxwindow */
+    wxASSERT_MSG( (m_wxwindow != NULL), "invalid frame" );
     
     m_width = width;
     m_height = height;
 
+    /* space occupied by m_frameToolBar and m_frameMenuBar */
+    int client_area_y_offset = 0; 
+
+    /* wxMDIChildFrame derives from wxFrame but it _is_ a wxWindow as it uses
+       wxWindow::Create to create it's GTK equivalent. m_mainWidget is only
+       set in wxFrame::Create so it is used to check what kind of frame we
+       have here. if m_mainWidget is NULL it is a wxMDIChildFrame and so we
+       skip the part which handles m_frameMenuBar, m_frameToolBar and (most
+       importantly) m_mainWidget */
+       
+    if (m_mainWidget)
+    {
         /* check if size is in legal range */
         if ((m_minWidth != -1) && (m_width < m_minWidth)) m_width = m_minWidth;
         if ((m_minHeight != -1) && (m_height < m_minHeight)) m_height = m_minHeight;
@@ -445,8 +467,6 @@ void wxFrame::GtkOnSize( int WXUNUSED(x), int WXUNUSED(y), int width, int height
          * this hurts in the eye, but I don't want to call SetSize()
          * because I don't want to call any non-native functions here. */
      
-    int client_area_y_offset = 0; 
-
         if (m_frameMenuBar)
         {
             int xx = m_miniEdge;
@@ -484,6 +504,8 @@ void wxFrame::GtkOnSize( int WXUNUSED(x), int WXUNUSED(y), int width, int height
         }
     
         gtk_myfixed_move( GTK_MYFIXED(m_mainWidget), m_wxwindow, 0, client_area_y_offset );
+    }
+    
     gtk_widget_set_usize( m_wxwindow, m_width, m_height-client_area_y_offset );
 
     if (m_frameStatusBar)
@@ -533,8 +555,6 @@ void wxFrame::OnInternalIdle()
 
 void wxFrame::OnCloseWindow( wxCloseEvent& event )
 {
-    // close the window if it wasn't vetoed by the application
-//    if ( !event.GetVeto() ) // No, this isn't the interpretation of GetVeto.
     Destroy();
 }
 

src/gtk1/mdi.cpp

@@ -33,48 +33,6 @@ const int wxMENU_HEIGHT    = 27;
 
 extern wxList wxPendingDelete;
 
-//-----------------------------------------------------------------------------
-// "size_allocate"
-//-----------------------------------------------------------------------------
-
-static void gtk_page_size_callback( GtkWidget *WXUNUSED(widget), GtkAllocation* alloc, wxWindow *win )
-{
-    if ((win->m_x == alloc->x) &&
-        (win->m_y == alloc->y) &&
-        (win->m_width == alloc->width) &&
-        (win->m_height == alloc->height) &&
-        (win->m_sizeSet))
-    {
-        return;
-    }
-
-    win->SetSize( alloc->x, alloc->y, alloc->width, alloc->height );
-}
-
-//-----------------------------------------------------------------------------
-// "switch_page"
-//-----------------------------------------------------------------------------
-
-static void gtk_page_change_callback( GtkNotebook *WXUNUSED(widget),
-                                      GtkNotebookPage *page,
-                                      gint WXUNUSED(nPage),
-                                      wxMDIClientWindow *client_win )
-{
-    wxNode *node = client_win->m_children.First();
-    while (node)
-    {
-        wxMDIChildFrame *child_frame = (wxMDIChildFrame *)node->Data();
-        if (child_frame->m_page == page)
-        {
-            wxMDIParentFrame *mdi_frame = (wxMDIParentFrame*)client_win->m_parent;
-            mdi_frame->m_currentChild = child_frame;
-            mdi_frame->SetMDIMenuBar( child_frame->m_menuBar );
-            return;
-        }
-        node = node->Next();
-    }
-}
-
 //-----------------------------------------------------------------------------
 // wxMDIParentFrame
 //-----------------------------------------------------------------------------
@@ -84,11 +42,10 @@ IMPLEMENT_DYNAMIC_CLASS(wxMDIParentFrame,wxFrame)
 BEGIN_EVENT_TABLE(wxMDIParentFrame, wxFrame)
 END_EVENT_TABLE()
 
-wxMDIParentFrame::wxMDIParentFrame(void)
+wxMDIParentFrame::wxMDIParentFrame()
 {
+    m_justInserted = FALSE;
     m_clientWindow = (wxMDIClientWindow *) NULL;
-    m_currentChild = (wxMDIChildFrame *) NULL;
-    m_parentFrameActive = TRUE;
 }
 
 wxMDIParentFrame::wxMDIParentFrame( wxWindow *parent,
@@ -96,13 +53,12 @@ wxMDIParentFrame::wxMDIParentFrame( wxWindow *parent,
       const wxPoint& pos, const wxSize& size,
       long style, const wxString& name )
 {
+    m_justInserted = FALSE;
     m_clientWindow = (wxMDIClientWindow *) NULL;
-    m_currentChild = (wxMDIChildFrame *) NULL;
-    m_parentFrameActive = TRUE;
     Create( parent, id, title, pos, size, style, name );
 }
 
-wxMDIParentFrame::~wxMDIParentFrame(void)
+wxMDIParentFrame::~wxMDIParentFrame()
 {
 }
 
@@ -122,38 +78,57 @@ void wxMDIParentFrame::GtkOnSize( int x, int y, int width, int height )
 {
     wxFrame::GtkOnSize( x, y, width, height );
     
-    if (m_mdiMenuBar)
+    wxMDIChildFrame *child_frame = GetActiveChild();
-    {
+    if (!child_frame) return;
-        m_mdiMenuBar->m_x = 0;
+    
-        m_mdiMenuBar->m_y = 0;
+    wxMenuBar *menu_bar = child_frame->m_menuBar;
-        m_mdiMenuBar->m_width = m_width;
+    if (!menu_bar) return;
-        m_mdiMenuBar->m_height = wxMENU_HEIGHT;
+    if (!menu_bar->m_widget) return;
-        gtk_myfixed_move( GTK_MYFIXED(m_wxwindow), m_mdiMenuBar->m_widget, 0, 0 );
+    
-        gtk_widget_set_usize( m_mdiMenuBar->m_widget, m_width, wxMENU_HEIGHT );
+    menu_bar->m_x = 0;
-    }
+    menu_bar->m_y = 0;
+    menu_bar->m_width = m_width;
+    menu_bar->m_height = wxMENU_HEIGHT;
+    gtk_myfixed_move( GTK_MYFIXED(m_mainWidget), menu_bar->m_widget, 0, 0 );
+    gtk_widget_set_usize( menu_bar->m_widget, m_width, wxMENU_HEIGHT );
 }
 
-void wxMDIParentFrame::SetMDIMenuBar( wxMenuBar *menu_bar )
+void wxMDIParentFrame::OnInternalIdle()
 {
-    /* hide old child menu bar */
+    /* if a an MDI child window has just been inserted
-    if (m_mdiMenuBar) m_mdiMenuBar->Show( FALSE );
+       it has to be brought to the top in idle time. we
+       simply set the last notebook page active as new
+       pages can only be appended at the end */
 
-    m_mdiMenuBar = menu_bar;
+    if (m_justInserted)
-
-    /* show and resize new menu child menu bar */
-    if (m_mdiMenuBar)
     {
-        m_mdiMenuBar->m_x = 0;
+        GtkNotebook *notebook = GTK_NOTEBOOK(m_clientWindow->m_widget);
-        m_mdiMenuBar->m_y = 0;
+	gtk_notebook_set_page( notebook, g_list_length( notebook->children ) - 1 );
-        m_mdiMenuBar->m_width = m_width;
+	
-        m_mdiMenuBar->m_height = wxMENU_HEIGHT;
+	m_justInserted = FALSE;
-        gtk_myfixed_move( GTK_MYFIXED(m_wxwindow), m_mdiMenuBar->m_widget, 0, 0 );
+	return;
-        gtk_widget_set_usize( m_mdiMenuBar->m_widget, m_width, wxMENU_HEIGHT );
+    }
-        m_mdiMenuBar->Show( TRUE );
+       
+    wxFrame::OnInternalIdle();
+
+    wxMDIChildFrame *active_child_frame = GetActiveChild();
+    
+    wxNode *node = m_clientWindow->m_children.First();
+    while (node)
+    {
+        wxMDIChildFrame *child_frame = (wxMDIChildFrame *)node->Data();
+	if (child_frame->m_menuBar)
+	{
+	    if (child_frame == active_child_frame)
+	       gtk_widget_show( child_frame->m_menuBar->m_widget );
+	    else
+	       gtk_widget_hide( child_frame->m_menuBar->m_widget );
+	}
+        node = node->Next();
     }
     
     /* show/hide parent menu bar as required */
-    if (m_frameMenuBar) m_frameMenuBar->Show( (m_mdiMenuBar == NULL) );
+    if (m_frameMenuBar) m_frameMenuBar->Show( (active_child_frame == NULL) );
 }
 
 void wxMDIParentFrame::GetClientSize(int *width, int *height ) const
@@ -161,29 +136,49 @@ void wxMDIParentFrame::GetClientSize(int *width, int *height ) const
     wxFrame::GetClientSize( width, height );
 }
 
-wxMDIChildFrame *wxMDIParentFrame::GetActiveChild(void) const
+wxMDIChildFrame *wxMDIParentFrame::GetActiveChild() const
 {
-    return m_currentChild;
+    if (!m_clientWindow) return (wxMDIChildFrame*) NULL;
+    
+    GtkNotebook *notebook = GTK_NOTEBOOK(m_clientWindow->m_widget);
+    if (!notebook) return (wxMDIChildFrame*) NULL;
+    
+    gint i = gtk_notebook_get_current_page( notebook );
+    if (i < 0) return (wxMDIChildFrame*) NULL;
+    
+    GtkNotebookPage* page = (GtkNotebookPage*) (g_list_nth(notebook->children,i)->data);
+    if (!page) return (wxMDIChildFrame*) NULL;
+    
+    wxNode *node = m_clientWindow->m_children.First();
+    while (node)
+    {
+        wxMDIChildFrame *child_frame = (wxMDIChildFrame *)node->Data();
+        if (child_frame->m_page == page)
+            return child_frame;
+        node = node->Next();
     }
     
-wxMDIClientWindow *wxMDIParentFrame::GetClientWindow(void) const
+    return (wxMDIChildFrame*) NULL;
+}
+
+wxMDIClientWindow *wxMDIParentFrame::GetClientWindow() const
 {
     return m_clientWindow;
 }
 
-wxMDIClientWindow *wxMDIParentFrame::OnCreateClient(void)
+wxMDIClientWindow *wxMDIParentFrame::OnCreateClient()
 {
     m_clientWindow = new wxMDIClientWindow( this );
     return m_clientWindow;
 }
 
-void wxMDIParentFrame::ActivateNext(void)
+void wxMDIParentFrame::ActivateNext()
 {
     if (m_clientWindow)
       gtk_notebook_next_page( GTK_NOTEBOOK(m_clientWindow->m_widget) );
 }
 
-void wxMDIParentFrame::ActivatePrevious(void)
+void wxMDIParentFrame::ActivatePrevious()
 {
     if (m_clientWindow)
       gtk_notebook_prev_page( GTK_NOTEBOOK(m_clientWindow->m_widget) );
@@ -207,7 +202,7 @@ BEGIN_EVENT_TABLE(wxMDIChildFrame, wxFrame)
     EVT_ACTIVATE(wxMDIChildFrame::OnActivate)
 END_EVENT_TABLE()
 
-wxMDIChildFrame::wxMDIChildFrame(void)
+wxMDIChildFrame::wxMDIChildFrame()
 {
     m_menuBar = (wxMenuBar *) NULL;
     m_page = (GtkNotebookPage *) NULL;
@@ -223,19 +218,11 @@ wxMDIChildFrame::wxMDIChildFrame( wxMDIParentFrame *parent,
     Create( parent, id, title, wxDefaultPosition, size, style, name );
 }
 
-wxMDIChildFrame::~wxMDIChildFrame(void)
+wxMDIChildFrame::~wxMDIChildFrame()
 {
     if (m_menuBar)
-    {
-        wxMDIParentFrame *mdi_frame = (wxMDIParentFrame*)m_parent->m_parent;
-        if (mdi_frame->m_currentChild == this)
-        {
-            mdi_frame->SetMDIMenuBar( (wxMenuBar *) NULL );
-            mdi_frame->m_currentChild = (wxMDIChildFrame *) NULL;
-        }
         delete m_menuBar;
 }
-}
 
 bool wxMDIChildFrame::Create( wxMDIParentFrame *parent,
       wxWindowID id, const wxString& title,
@@ -291,10 +278,12 @@ void wxMDIChildFrame::SetMenuBar( wxMenuBar *menu_bar )
             m_menuBar->m_parent = mdi_frame;
         }
 
-        gtk_myfixed_put( GTK_MYFIXED(mdi_frame->m_wxwindow),
+        /* the menu bar of the child window is shown in idle time as needed */
-          m_menuBar->m_widget, m_menuBar->m_x, m_menuBar->m_y );
+	gtk_widget_hide( m_menuBar->m_widget );
 
-        mdi_frame->SetMDIMenuBar( m_menuBar );
+        /* insert the invisible menu bar into the _parent_ mdi frame */
+        gtk_myfixed_put( GTK_MYFIXED(mdi_frame->m_mainWidget), m_menuBar->m_widget, 0, 0 );
+        gtk_widget_set_usize( menu_bar->m_widget, mdi_frame->m_width, wxMENU_HEIGHT );
     }
 }
 
@@ -303,7 +292,7 @@ wxMenuBar *wxMDIChildFrame::GetMenuBar() const
     return m_menuBar;
 }
 
-void wxMDIChildFrame::Activate(void)
+void wxMDIChildFrame::Activate()
 {
 }
 
@@ -311,6 +300,24 @@ void wxMDIChildFrame::OnActivate( wxActivateEvent &WXUNUSED(event) )
 {
 }
 
+//-----------------------------------------------------------------------------
+// "size_allocate"
+//-----------------------------------------------------------------------------
+
+static void gtk_page_size_callback( GtkWidget *WXUNUSED(widget), GtkAllocation* alloc, wxWindow *win )
+{
+    if ((win->m_x == alloc->x) &&
+        (win->m_y == alloc->y) &&
+        (win->m_width == alloc->width) &&
+        (win->m_height == alloc->height) &&
+        (win->m_sizeSet))
+    {
+        return;
+    }
+
+    win->SetSize( alloc->x, alloc->y, alloc->width, alloc->height );
+}
+
 //-----------------------------------------------------------------------------
 // InsertChild callback for wxMDIClientWindow
 //-----------------------------------------------------------------------------
@@ -332,9 +339,8 @@ static void wxInsertChildInMDI( wxMDIClientWindow* parent, wxMDIChildFrame* chil
 
     child->m_page = (GtkNotebookPage*) (g_list_last(notebook->children)->data);
     
-    gtk_notebook_set_page( notebook, parent->m_children.Number()-1 );
+    wxMDIParentFrame *parent_frame = (wxMDIParentFrame*) parent->m_parent;
-
+    parent_frame->m_justInserted = TRUE;
-    gtk_page_change_callback( (GtkNotebook *) NULL, child->m_page, 0, parent );
 }
 
 //-----------------------------------------------------------------------------
@@ -343,7 +349,7 @@ static void wxInsertChildInMDI( wxMDIClientWindow* parent, wxMDIChildFrame* chil
 
 IMPLEMENT_DYNAMIC_CLASS(wxMDIClientWindow,wxWindow)
 
-wxMDIClientWindow::wxMDIClientWindow(void)
+wxMDIClientWindow::wxMDIClientWindow()
 {
 }
 
@@ -352,7 +358,7 @@ wxMDIClientWindow::wxMDIClientWindow( wxMDIParentFrame *parent, long style )
     CreateClient( parent, style );
 }
 
-wxMDIClientWindow::~wxMDIClientWindow(void)
+wxMDIClientWindow::~wxMDIClientWindow()
 {
 }
 
@@ -366,9 +372,6 @@ bool wxMDIClientWindow::CreateClient( wxMDIParentFrame *parent, long style )
 
     m_widget = gtk_notebook_new();
 
-    gtk_signal_connect( GTK_OBJECT(m_widget), "switch_page",
-                        GTK_SIGNAL_FUNC(gtk_page_change_callback), (gpointer)this );
-
     gtk_notebook_set_scrollable( GTK_NOTEBOOK(m_widget), 1 );
 
     m_parent->AddChild( this );