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VTK wrapper of vtkRenderWindow for wxPython. Tested on MSW so far.
[wxWidgets.git] / src / gtk / win_gtk.c
diff --git a/src/gtk/win_gtk.c b/src/gtk/win_gtk.c
index 2e1a9809f70ce145ba8f4e346735517d5fbc4f6e..2097a2db33d513361ba7f909c349543839c30f10 100644 (file)
--- a/src/gtk/win_gtk.c
+++ b/src/gtk/win_gtk.c
@@ -1,6 +1,8 @@
 /* ///////////////////////////////////////////////////////////////////////////
 // Name:        win_gtk.c
 /* ///////////////////////////////////////////////////////////////////////////
 // Name:        win_gtk.c
-// Purpose:     native GTK+ widget for wxWindows
+// Purpose:     Native GTK+ widget for wxWindows, based on GtkLayout and
+//              GtkFixed. It makes use of the gravity window property and
+//              therefore does not work with GTK 1.0.
 // Author:      Robert Roebling
 // Id:          $Id$
 // Copyright:   (c) 1998 Robert Roebling
 // Author:      Robert Roebling
 // Id:          $Id$
 // Copyright:   (c) 1998 Robert Roebling
@@ -8,488 +10,1215 @@
 /////////////////////////////////////////////////////////////////////////// */
 
 #include "wx/gtk/win_gtk.h"
 /////////////////////////////////////////////////////////////////////////// */
 
 #include "wx/gtk/win_gtk.h"
-#include <gtk/gtkfeatures.h>
+#include "gtk/gtksignal.h"
+#include "gtk/gtkprivate.h"
+#include "gdk/gdkx.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif /* __cplusplus */
 
 
 #ifdef __cplusplus
 extern "C" {
 #endif /* __cplusplus */
 
-static void gtk_myfixed_class_init    (GtkMyFixedClass    *klass);
-static void gtk_myfixed_init          (GtkMyFixed         *myfixed);
-static void gtk_myfixed_map           (GtkWidget        *widget);
-static void gtk_myfixed_unmap         (GtkWidget        *widget);
-static void gtk_myfixed_realize       (GtkWidget        *widget);
-static void gtk_myfixed_size_request  (GtkWidget        *widget,
+#define IS_ONSCREEN(x,y) ((x >= G_MINSHORT) && (x <= G_MAXSHORT) && \
+                          (y >= G_MINSHORT) && (y <= G_MAXSHORT))
+
+typedef struct _GtkPizzaAdjData  GtkPizzaAdjData;
+typedef struct _GtkPizzaChild    GtkPizzaChild;
+
+struct _GtkPizzaAdjData 
+{
+    gint dx;
+    gint dy;
+};
+
+struct _GtkPizzaChild
+{
+    GtkWidget *widget;
+    gint x;
+    gint y;
+    gint width;
+    gint height;
+};
+
+static void gtk_pizza_class_init      (GtkPizzaClass  *klass);
+static void gtk_pizza_init            (GtkPizza       *pizza);
+
+static void gtk_pizza_realize         (GtkWidget        *widget);
+static void gtk_pizza_unrealize       (GtkWidget        *widget);
+
+static void gtk_pizza_map             (GtkWidget        *widget);
+
+static void gtk_pizza_size_request  (GtkWidget        *widget,
                                     GtkRequisition   *requisition);
                                     GtkRequisition   *requisition);
-static void gtk_myfixed_size_allocate (GtkWidget        *widget,
+static void gtk_pizza_size_allocate (GtkWidget        *widget,
                                     GtkAllocation    *allocation);
                                     GtkAllocation    *allocation);
-static void gtk_myfixed_paint         (GtkWidget        *widget,
+static void gtk_pizza_draw          (GtkWidget        *widget,
                                     GdkRectangle     *area);
                                     GdkRectangle     *area);
-static void gtk_myfixed_draw          (GtkWidget        *widget,
-                                    GdkRectangle     *area);
-static gint gtk_myfixed_expose        (GtkWidget        *widget,
+static gint gtk_pizza_expose        (GtkWidget        *widget,
                                     GdkEventExpose   *event);
                                     GdkEventExpose   *event);
-static void gtk_myfixed_add           (GtkContainer     *container,
+static void gtk_pizza_add           (GtkContainer     *container,
                                     GtkWidget        *widget);
                                     GtkWidget        *widget);
-static void gtk_myfixed_remove        (GtkContainer     *container,
+static void gtk_pizza_remove        (GtkContainer     *container,
                                     GtkWidget        *widget);
                                     GtkWidget        *widget);
-static void gtk_myfixed_foreach       (GtkContainer     *container,
-#if (GTK_MINOR_VERSION == 1)
+static void gtk_pizza_forall       (GtkContainer     *container,
                                     gboolean         include_internals,
                                     gboolean         include_internals,
-#endif
                                     GtkCallback      callback,
                                     gpointer         callback_data);
 
                                     GtkCallback      callback,
                                     gpointer         callback_data);
 
+static void     gtk_pizza_position_child     (GtkPizza      *pizza,
+                                              GtkPizzaChild *child);
+static void     gtk_pizza_allocate_child     (GtkPizza      *pizza,
+                                              GtkPizzaChild *child);
+static void     gtk_pizza_position_children  (GtkPizza      *pizza);
+
+static void     gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
+                                                      gpointer   cb_data);
+static void     gtk_pizza_adjust_allocations         (GtkPizza *pizza,
+                                                      gint       dx,
+                                                      gint       dy);
+
+
+static void     gtk_pizza_expose_area        (GtkPizza      *pizza,
+                                              gint            x, 
+                                              gint            y, 
+                                              gint            width, 
+                                              gint            height);
+static void     gtk_pizza_adjustment_changed (GtkAdjustment  *adjustment,
+                                              GtkPizza      *pizza);
+static GdkFilterReturn gtk_pizza_filter      (GdkXEvent      *gdk_xevent,
+                                              GdkEvent       *event,
+                                              gpointer        data);
+static GdkFilterReturn gtk_pizza_main_filter (GdkXEvent      *gdk_xevent,
+                                              GdkEvent       *event,
+                                              gpointer        data);
 
 
-static GtkContainerClass *parent_class = NULL;
 
 
+static GtkType gtk_pizza_child_type (GtkContainer     *container);
+
+static void  gtk_pizza_scroll_set_adjustments    (GtkPizza   *pizza,
+                                              GtkAdjustment *hadj,
+                                              GtkAdjustment *vadj);
+
+
+static GtkContainerClass *parent_class = NULL;
+static gboolean gravity_works;
 
 guint
 
 guint
-gtk_myfixed_get_type ()
+gtk_pizza_get_type ()
 {
 {
-  static guint myfixed_type = 0;
+    static guint pizza_type = 0;
 
 
-  if (!myfixed_type)
+    if (!pizza_type)
     {
     {
-      GtkTypeInfo myfixed_info =
-      {
-       "GtkMyFixed",
-       sizeof (GtkMyFixed),
-       sizeof (GtkMyFixedClass),
-       (GtkClassInitFunc) gtk_myfixed_class_init,
-       (GtkObjectInitFunc) gtk_myfixed_init,
-       (GtkArgSetFunc) NULL,
-        (GtkArgGetFunc) NULL,
-      };
-
-      myfixed_type = gtk_type_unique (gtk_container_get_type (), &myfixed_info);
+        GtkTypeInfo pizza_info =
+        {
+          "GtkPizza",
+          sizeof (GtkPizza),
+          sizeof (GtkPizzaClass),
+          (GtkClassInitFunc) gtk_pizza_class_init,
+          (GtkObjectInitFunc) gtk_pizza_init,
+          /* reserved_1 */ NULL,
+           /* reserved_2 */ NULL,
+           (GtkClassInitFunc) NULL,
+        };
+        pizza_type = gtk_type_unique (gtk_container_get_type (), &pizza_info);
     }
     }
-
-  return myfixed_type;
+    
+    return pizza_type;
 }
 
 static void
 }
 
 static void
-gtk_myfixed_class_init (GtkMyFixedClass *klass)
+gtk_pizza_class_init (GtkPizzaClass *klass)
 {
 {
-  GtkObjectClass *object_class;
-  GtkWidgetClass *widget_class;
-  GtkContainerClass *container_class;
-
-  object_class = (GtkObjectClass*) klass;
-  widget_class = (GtkWidgetClass*) klass;
-  container_class = (GtkContainerClass*) klass;
-
-  parent_class = gtk_type_class (gtk_container_get_type ());
-
-  widget_class->map = gtk_myfixed_map;
-  widget_class->unmap = gtk_myfixed_unmap;
-  widget_class->realize = gtk_myfixed_realize;
-  widget_class->size_request = gtk_myfixed_size_request;
-  widget_class->size_allocate = gtk_myfixed_size_allocate;
-  widget_class->draw = gtk_myfixed_draw;
-  widget_class->expose_event = gtk_myfixed_expose;
+    GtkObjectClass *object_class;
+    GtkWidgetClass *widget_class;
+    GtkContainerClass *container_class;
+
+    object_class = (GtkObjectClass*) klass;
+    widget_class = (GtkWidgetClass*) klass;
+    container_class = (GtkContainerClass*) klass;
+    parent_class = gtk_type_class (GTK_TYPE_CONTAINER);
+
+    widget_class->map = gtk_pizza_map;
+    widget_class->realize = gtk_pizza_realize;
+    widget_class->unrealize = gtk_pizza_unrealize;
+    widget_class->size_request = gtk_pizza_size_request;
+    widget_class->size_allocate = gtk_pizza_size_allocate;
+    widget_class->draw = gtk_pizza_draw;
+    widget_class->expose_event = gtk_pizza_expose;
+
+    container_class->add = gtk_pizza_add;
+    container_class->remove = gtk_pizza_remove;
+    container_class->forall = gtk_pizza_forall;
+
+    container_class->child_type = gtk_pizza_child_type;
+
+    klass->set_scroll_adjustments = gtk_pizza_scroll_set_adjustments;
+
+    widget_class->set_scroll_adjustments_signal =
+    gtk_signal_new ("set_scroll_adjustments",
+                   GTK_RUN_LAST,
+                   object_class->type,
+                   GTK_SIGNAL_OFFSET (GtkPizzaClass, set_scroll_adjustments),
+                   gtk_marshal_NONE__POINTER_POINTER,
+                   GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
+}
 
 
-  container_class->add = gtk_myfixed_add;
-  container_class->remove = gtk_myfixed_remove;
-#if (GTK_MINOR_VERSION == 1)
-  container_class->forall = gtk_myfixed_foreach;
-#else
-  container_class->foreach = gtk_myfixed_foreach;
-#endif
+static GtkType
+gtk_pizza_child_type (GtkContainer     *container)
+{
+    return GTK_TYPE_WIDGET;
 }
 
 static void
 }
 
 static void
-gtk_myfixed_init (GtkMyFixed *myfixed)
+gtk_pizza_init (GtkPizza *pizza)
 {
 {
-  GTK_WIDGET_UNSET_FLAGS (myfixed, GTK_NO_WINDOW);
-  GTK_WIDGET_SET_FLAGS (myfixed, GTK_BASIC);
+    GTK_WIDGET_UNSET_FLAGS (pizza, GTK_NO_WINDOW);
   
   
-  myfixed->children = NULL;
+    pizza->shadow_type = GTK_MYSHADOW_NONE;
+
+    pizza->children = NULL;
+    
+    pizza->width = 20;
+    pizza->height = 20;
+
+    pizza->bin_window = NULL;
+
+    pizza->configure_serial = 0;
+    pizza->scroll_x = 0;
+    pizza->scroll_y = 0;
+    pizza->visibility = GDK_VISIBILITY_PARTIAL;
+    
+    pizza->clear_on_draw = TRUE;
 }
 
 GtkWidget*
 }
 
 GtkWidget*
-gtk_myfixed_new ()
+gtk_pizza_new ()
 {
 {
-  GtkMyFixed *myfixed;
+    GtkPizza *pizza;
 
 
-  myfixed = gtk_type_new (gtk_myfixed_get_type ());
+    pizza = gtk_type_new (gtk_pizza_get_type ());
   
   
-  return GTK_WIDGET (myfixed);
+    return GTK_WIDGET (pizza);
+}
+
+void  
+gtk_pizza_scroll_set_adjustments (GtkPizza     *pizza,
+                                   GtkAdjustment  *hadj,
+                                   GtkAdjustment  *vadj)
+{
+   /* We handle scrolling in the wxScrolledWindow, not here. */
 }
 
 }
 
+void 
+gtk_pizza_set_shadow_type (GtkPizza      *pizza,
+                            GtkMyShadowType  type)
+{
+    g_return_if_fail (pizza != NULL);
+    g_return_if_fail (GTK_IS_PIZZA (pizza));
+
+    if ((GtkMyShadowType) pizza->shadow_type != type)
+    {
+        pizza->shadow_type = type;
+
+        if (GTK_WIDGET_VISIBLE (pizza))
+       {
+           gtk_widget_size_allocate (GTK_WIDGET (pizza), &(GTK_WIDGET (pizza)->allocation));
+           gtk_widget_queue_draw (GTK_WIDGET (pizza));
+       }
+    }
+}
+
+void       
+gtk_pizza_set_clear (GtkPizza     *pizza,
+                        gboolean        clear)
+{
+    g_return_if_fail (pizza != NULL);
+    g_return_if_fail (GTK_IS_PIZZA (pizza));
+    
+    pizza->clear_on_draw = clear;
+}      
+                                       
 void
 void
-gtk_myfixed_put (GtkMyFixed       *myfixed,
-               GtkWidget      *widget,
-               gint16         x,
-               gint16         y)
+gtk_pizza_put (GtkPizza    *pizza,
+                 GtkWidget     *widget,
+                 gint         x,
+                 gint         y,
+                gint         width,
+                gint         height)
 {
 {
-  GtkMyFixedChild *child_info;
+    GtkPizzaChild *child_info;
 
 
-  g_return_if_fail (myfixed != NULL);
-  g_return_if_fail (GTK_IS_MYFIXED (myfixed));
-  g_return_if_fail (widget != NULL);
+    g_return_if_fail (pizza != NULL);
+    g_return_if_fail (GTK_IS_PIZZA (pizza));
+    g_return_if_fail (widget != NULL);
 
 
-  child_info = g_new (GtkMyFixedChild, 1);
-  child_info->widget = widget;
-  child_info->x = x;
-  child_info->y = y;
+    child_info = g_new (GtkPizzaChild, 1);
+    
+    child_info->widget = widget;
+    child_info->x = x;
+    child_info->y = y;
+    child_info->width = width;
+    child_info->height = height;
   
   
-  gtk_widget_set_parent (widget, GTK_WIDGET (myfixed));
+    pizza->children = g_list_append (pizza->children, child_info); 
 
 
-  myfixed->children = g_list_append (myfixed->children, child_info); 
+    gtk_widget_set_parent (widget, GTK_WIDGET (pizza));
 
 
-  if (GTK_WIDGET_REALIZED (myfixed) && !GTK_WIDGET_REALIZED (widget))
-    gtk_widget_realize (widget);
+    if (GTK_WIDGET_REALIZED (pizza))
+      gtk_widget_set_parent_window (widget, pizza->bin_window);
+    
+    if (!IS_ONSCREEN (x, y))
+       GTK_PRIVATE_SET_FLAG (widget, GTK_IS_OFFSCREEN);
 
 
-  if (GTK_WIDGET_MAPPED (myfixed) && !GTK_WIDGET_MAPPED (widget))
-    gtk_widget_map (widget);
+    if (GTK_WIDGET_REALIZED (pizza))
+        gtk_widget_realize (widget);
 
 
-  if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (myfixed))
-    gtk_widget_queue_resize (GTK_WIDGET (myfixed));
+    gtk_widget_set_usize (widget, width, height);
+    
+    if (GTK_WIDGET_VISIBLE (pizza) && GTK_WIDGET_VISIBLE (widget))
+    {
+        if (GTK_WIDGET_MAPPED (pizza))
+           gtk_widget_map (widget);
+      
+        gtk_widget_queue_resize (widget);
+    }
 }
 
 void
 }
 
 void
-gtk_myfixed_move (GtkMyFixed       *myfixed,
-                GtkWidget      *widget,
-                gint16         x,
-                gint16         y)
+gtk_pizza_move (GtkPizza    *pizza,
+                  GtkWidget     *widget,
+                  gint         x,
+                  gint         y)
 {
 {
-  GtkMyFixedChild *child;
-  GList *children;
+    GtkPizzaChild *child;
+    GList *children;
 
 
-  g_return_if_fail (myfixed != NULL);
-  g_return_if_fail (GTK_IS_MYFIXED (myfixed));
-  g_return_if_fail (widget != NULL);
+    g_return_if_fail (pizza != NULL);
+    g_return_if_fail (GTK_IS_PIZZA (pizza));
+    g_return_if_fail (widget != NULL);
 
 
-  children = myfixed->children;
-  while (children)
+    children = pizza->children;
+    while (children)
     {
     {
-      child = children->data;
-      children = children->next;
+        child = children->data;
+        children = children->next;
+      
+        if (child->widget == widget)
+        {
+           if ((child->x == x) && (child->y == y))
+               break;
+           
+            child->x = x;
+            child->y = y;
+           
+           if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
+               gtk_widget_queue_resize (widget);
+           break;
+       }
+    }
+}
+
+void
+gtk_pizza_resize (GtkPizza     *pizza,
+                    GtkWidget      *widget,
+                   gint         width,
+                   gint         height)
+{
+    GtkPizzaChild *child;
+    GList *children;
 
 
-      if (child->widget == widget)
+    g_return_if_fail (pizza != NULL);
+    g_return_if_fail (GTK_IS_PIZZA (pizza));
+    g_return_if_fail (widget != NULL);
+
+    children = pizza->children;
+    while (children)
+    {
+        child = children->data;
+        children = children->next;
+      
+        if (child->widget == widget)
         {
         {
-         if ((child->x == x) && (child->y == y)) return;
-         
-          child->x = x;
-          child->y = y;
+           if ((child->width == width) && (child->height == height))
+               break;
+           
+            child->width = width;
+            child->height = height;
+           
+           gtk_widget_set_usize (widget, width, height);
+           
+            if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
+               gtk_widget_queue_resize (widget);
+           break;
+       }
+    }
+}
 
 
-          if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (myfixed))
-            gtk_widget_queue_resize (GTK_WIDGET (myfixed));
+void
+gtk_pizza_set_size (GtkPizza    *pizza,
+                      GtkWidget     *widget,
+                      gint        x,
+                      gint         y,
+                     gint         width,
+                     gint         height)
+{
+    GtkPizzaChild *child;
+    GList *children;
+    GtkAllocation child_allocation;
+
+    g_return_if_fail (pizza != NULL);
+    g_return_if_fail (GTK_IS_PIZZA (pizza));
+    g_return_if_fail (widget != NULL);
 
 
-          break;
+    children = pizza->children;
+    while (children)
+    {
+        child = children->data;
+        children = children->next;
+
+        if (child->widget == widget)
+        {
+           if ((child->x == x) && 
+               (child->y == y) &&
+               (child->width == width) && 
+               (child->height == height)) return;
+         
+            child->x = x;
+            child->y = y;
+            child->width = width;
+            child->height = height;
+           
+           gtk_widget_set_usize (widget, width, height);
+           
+            if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (pizza))
+               gtk_widget_queue_resize (widget);
+                   
+            return;
         }
     }
 }
 
 static void
         }
     }
 }
 
 static void
-gtk_myfixed_map (GtkWidget *widget)
+gtk_pizza_map (GtkWidget *widget)
 {
 {
-  GtkMyFixed *myfixed;
-  GtkMyFixedChild *child;
-  GList *children;
-
-  g_return_if_fail (widget != NULL);
-  g_return_if_fail (GTK_IS_MYFIXED (widget));
+    GtkPizza *pizza;
+    GtkPizzaChild *child;
+    GList *children;
 
 
-  GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
-  myfixed = GTK_MYFIXED (widget);
+    g_return_if_fail (widget != NULL);
+    g_return_if_fail (GTK_IS_PIZZA (widget));
 
 
-  gdk_window_show (widget->window);
+    GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);
+    pizza = GTK_PIZZA (widget);
 
 
-  children = myfixed->children;
-  while (children)
+    children = pizza->children;
+    while (children)
     {
     {
-      child = children->data;
-      children = children->next;
+        child = children->data;
+        children = children->next;
 
 
-      if (GTK_WIDGET_VISIBLE (child->widget) &&
-         !GTK_WIDGET_MAPPED (child->widget))
-       gtk_widget_map (child->widget);
+        if ( GTK_WIDGET_VISIBLE (child->widget) && 
+           !GTK_WIDGET_MAPPED (child->widget) &&
+           !GTK_WIDGET_IS_OFFSCREEN (child->widget))
+       {
+           gtk_widget_map (child->widget);
+       }
     }
     }
+    
+    gdk_window_show (widget->window);
+    gdk_window_show (pizza->bin_window);
 }
 
 static void
 }
 
 static void
-gtk_myfixed_unmap (GtkWidget *widget)
+gtk_pizza_realize (GtkWidget *widget)
 {
 {
-  g_return_if_fail (widget != NULL);
-  g_return_if_fail (GTK_IS_MYFIXED (widget));
+    GtkPizza *pizza;
+    GdkWindowAttr attributes;
+    gint attributes_mask;
+    GtkPizzaChild *child;
+    GList *children;
 
 
-  GTK_WIDGET_UNSET_FLAGS (widget, GTK_MAPPED);
+    g_return_if_fail (widget != NULL);
+    g_return_if_fail (GTK_IS_PIZZA (widget));
+
+    pizza = GTK_PIZZA (widget);
+  
+    GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
+
+    attributes.window_type = GDK_WINDOW_CHILD;
+  
+    attributes.x = widget->allocation.x;
+    attributes.y = widget->allocation.y;
+    attributes.width = widget->allocation.width;
+    attributes.height = widget->allocation.height;
+
+    if (pizza->shadow_type == GTK_MYSHADOW_NONE)
+    {
+        /* no border, no changes to sizes */
+    } else
+    if (pizza->shadow_type == GTK_MYSHADOW_THIN)
+    {
+        /* GTK_MYSHADOW_THIN == wxSIMPLE_BORDER */
+        attributes.x += 1;
+        attributes.y += 1;
+        attributes.width -= 2;
+        attributes.height -= 2;
+    } else
+    {
+        /* GTK_MYSHADOW_IN == wxSUNKEN_BORDER */
+        /* GTK_MYSHADOW_OUT == wxRAISED_BORDER */
+        attributes.x += 2;
+        attributes.y += 2;
+        attributes.width -= 4;
+        attributes.height -= 4;
+    }
+    
+    /* minimal size */
+    if (attributes.width < 2) attributes.width = 2;
+    if (attributes.height < 2) attributes.height = 2;
+    
+    attributes.wclass = GDK_INPUT_OUTPUT;
+    attributes.visual = gtk_widget_get_visual (widget);
+    attributes.colormap = gtk_widget_get_colormap (widget);
+    attributes.event_mask = 
+       GDK_VISIBILITY_NOTIFY_MASK;
+    attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
+    
+    widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
+                                    &attributes, attributes_mask);
+    gdk_window_set_user_data (widget->window, widget);
+
+    attributes.x = 0;
+    attributes.y = 0;
+    
+    attributes.event_mask = gtk_widget_get_events (widget);
+    attributes.event_mask |= 
+       GDK_EXPOSURE_MASK       |
+       GDK_POINTER_MOTION_MASK |
+       GDK_POINTER_MOTION_HINT_MASK  |
+       GDK_BUTTON_MOTION_MASK  |
+       GDK_BUTTON1_MOTION_MASK |
+       GDK_BUTTON2_MOTION_MASK |
+       GDK_BUTTON3_MOTION_MASK |
+       GDK_BUTTON_PRESS_MASK   |
+       GDK_BUTTON_RELEASE_MASK |
+       GDK_KEY_PRESS_MASK      |
+       GDK_KEY_RELEASE_MASK    |
+       GDK_ENTER_NOTIFY_MASK   |
+       GDK_LEAVE_NOTIFY_MASK   |
+       GDK_FOCUS_CHANGE_MASK;
+
+    pizza->bin_window = gdk_window_new (widget->window,
+                                         &attributes, attributes_mask);
+    gdk_window_set_user_data (pizza->bin_window, widget);
+    
+    widget->style = gtk_style_attach (widget->style, widget->window);
+    gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
+    gtk_style_set_background (widget->style, pizza->bin_window, GTK_STATE_NORMAL);
+    
+    /* add filters for intercepting visibility and expose events */
+    gdk_window_add_filter (widget->window, gtk_pizza_main_filter, pizza);
+    gdk_window_add_filter (pizza->bin_window, gtk_pizza_filter, pizza);
+
+    /* we NEED gravity or we'll give up */
+    gravity_works = gdk_window_set_static_gravities (pizza->bin_window, TRUE);
+
+    /* cannot be done before realisation */
+    children = pizza->children;
+    while (children)
+    {
+        child = children->data;
+        children = children->next;
+
+        gtk_widget_set_parent_window (child->widget, pizza->bin_window);
+    }
 }
 
 }
 
-static void
-gtk_myfixed_realize (GtkWidget *widget)
+static void 
+gtk_pizza_unrealize (GtkWidget *widget)
 {
 {
-  GtkMyFixed *myfixed;
-  GdkWindowAttr attributes;
-  gint attributes_mask;
+  GtkPizza *pizza;
 
   g_return_if_fail (widget != NULL);
 
   g_return_if_fail (widget != NULL);
-  g_return_if_fail (GTK_IS_MYFIXED (widget));
+  g_return_if_fail (GTK_IS_PIZZA (widget));
 
 
-  myfixed = GTK_MYFIXED (widget);
-  
-  GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
-
-  attributes.window_type = GDK_WINDOW_CHILD;
-  attributes.x = widget->allocation.x;
-  attributes.y = widget->allocation.y;
-  attributes.width = 32000;
-  attributes.height = 32000;
-  attributes.wclass = GDK_INPUT_OUTPUT;
-  attributes.visual = gtk_widget_get_visual (widget);
-  attributes.colormap = gtk_widget_get_colormap (widget);
-  attributes.event_mask = gtk_widget_get_events (widget);
-  attributes.event_mask |= 
-  GDK_EXPOSURE_MASK    |
-  GDK_POINTER_MOTION_MASK      |
-  GDK_BUTTON_MOTION_MASK       |
-  GDK_BUTTON1_MOTION_MASK      |
-  GDK_BUTTON2_MOTION_MASK      |
-  GDK_BUTTON3_MOTION_MASK      |
-  GDK_BUTTON_PRESS_MASK                |
-  GDK_BUTTON_RELEASE_MASK      |
-  GDK_KEY_PRESS_MASK           |
-  GDK_KEY_RELEASE_MASK         |
-  GDK_ENTER_NOTIFY_MASK                |
-  GDK_LEAVE_NOTIFY_MASK                |
-  GDK_FOCUS_CHANGE_MASK;
-
-  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
-
-  widget->window = gdk_window_new (gtk_widget_get_parent_window (widget), &attributes, 
-                                  attributes_mask);
-  gdk_window_set_user_data (widget->window, widget);
-    
-  widget->style = gtk_style_attach (widget->style, widget->window);
-  gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
+  pizza = GTK_PIZZA (widget);
+
+  gdk_window_set_user_data (pizza->bin_window, NULL);
+  gdk_window_destroy (pizza->bin_window);
+  pizza->bin_window = NULL;
+
+  if (GTK_WIDGET_CLASS (parent_class)->unrealize)
+    (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
 }
 
 static void
 }
 
 static void
-gtk_myfixed_size_request (GtkWidget      *widget,
-                       GtkRequisition *requisition)
+gtk_pizza_size_request (GtkWidget      *widget,
+                         GtkRequisition *requisition)
 {
 {
-  GtkMyFixed *myfixed;
-  GtkMyFixedChild *child;
-  GList *children;
+    GtkPizza *pizza;
+    GtkPizzaChild *child;
+    GList *children;
+    GtkRequisition child_requisition;
   
   
-  g_return_if_fail (widget != NULL);
-  g_return_if_fail (GTK_IS_MYFIXED (widget));
-  g_return_if_fail (requisition != NULL);
+    g_return_if_fail (widget != NULL);
+    g_return_if_fail (GTK_IS_PIZZA (widget));
+    g_return_if_fail (requisition != NULL);
 
 
-  myfixed = GTK_MYFIXED (widget);
+    pizza = GTK_PIZZA (widget);
   
   
-  requisition->width = 0;
-  requisition->height = 0;
-
-  children = myfixed->children;
-  while (children)
+    children = pizza->children;
+    while (children)
     {
     {
-      child = children->data;
-      children = children->next;
+        child = children->data;
+        children = children->next;
 
 
-      if (GTK_WIDGET_VISIBLE (child->widget))
+        if (GTK_WIDGET_VISIBLE (child->widget))
        {
        {
-          gtk_widget_size_request (child->widget, &child->widget->requisition);
+            gtk_widget_size_request (child->widget, &child_requisition);
        }
     }
        }
     }
+    
+    /* request very little, I'm not sure if requesting nothing
+       will always have positive effects on stability... */
+    requisition->width = 2;
+    requisition->height = 2;
 }
 
 static void
 }
 
 static void
-gtk_myfixed_size_allocate (GtkWidget     *widget,
-                        GtkAllocation *allocation)
+gtk_pizza_size_allocate (GtkWidget     *widget,
+                          GtkAllocation *allocation)
 {
 {
-  GtkMyFixed *myfixed;
-  GtkMyFixedChild *child;
-  GtkAllocation child_allocation;
-  GList *children;
-  guint16 border_width;
+    GtkPizza *pizza;
+    gint border;
+    gint x,y,w,h;
+    GtkPizzaChild *child;
+    GtkAllocation child_allocation; 
+    GList *children;
+
+    g_return_if_fail (widget != NULL);
+    g_return_if_fail (GTK_IS_PIZZA(widget));
+    g_return_if_fail (allocation != NULL);
+
+    pizza = GTK_PIZZA (widget);
+  
+    widget->allocation = *allocation;
+    
+    if (pizza->shadow_type == GTK_MYSHADOW_NONE)
+        border = 0;
+    else
+    if (pizza->shadow_type == GTK_MYSHADOW_THIN)
+        border = 1;
+    else
+        border = 2;
+       
+    x = allocation->x + border;
+    y = allocation->y + border;
+    w = allocation->width - border*2;
+    h = allocation->height - border*2;
+
+    if (GTK_WIDGET_REALIZED (widget))
+    {
+        gdk_window_move_resize( widget->window, x, y, w, h );
+        gdk_window_move_resize( pizza->bin_window, 0, 0, w, h );
+    }
+    
+    children = pizza->children;
+    while (children)
+    {
+        child = children->data;
+        children = children->next;
+ 
+        gtk_pizza_position_child (pizza, child);
+        gtk_pizza_allocate_child (pizza, child);
+    }
+}
 
 
-  g_return_if_fail (widget != NULL);
-  g_return_if_fail (GTK_IS_MYFIXED(widget));
-  g_return_if_fail (allocation != NULL);
+static void
+gtk_pizza_draw (GtkWidget    *widget,
+                 GdkRectangle *area)
+{
+    GtkPizza *pizza;
+    GtkPizzaChild *child;
+    GdkRectangle child_area;
+    GList *children;
 
 
-  myfixed = GTK_MYFIXED (widget);
+    g_return_if_fail (widget != NULL);
+    g_return_if_fail (GTK_IS_PIZZA (widget));
 
 
-  widget->allocation = *allocation;
-  if (GTK_WIDGET_REALIZED (widget))
-    gdk_window_move_resize (widget->window, allocation->x, allocation->y, 32000, 32000 );
+    pizza = GTK_PIZZA (widget);
+      
+    children = pizza->children;
+    if ( !(GTK_WIDGET_APP_PAINTABLE (widget)) &&
+         (pizza->clear_on_draw))
+    {
+        gdk_window_clear_area( pizza->bin_window,
+                               area->x, area->y, area->width, area->height);
+    }
 
 
-  border_width = GTK_CONTAINER (myfixed)->border_width;
-  
-  children = myfixed->children;
-  while (children)
+    while (children)
     {
     {
-      child = children->data;
-      children = children->next;
-      
-      if (GTK_WIDGET_VISIBLE (child->widget))
+       child = children->data;
+       children = children->next;
+
+       if (gtk_widget_intersect (child->widget, area, &child_area))
+           gtk_widget_draw (child->widget, &child_area);
+    }
+}
+
+static gint
+gtk_pizza_expose (GtkWidget      *widget,
+                   GdkEventExpose *event)
+{
+    GtkPizza *pizza;
+    GtkPizzaChild *child;
+    GdkEventExpose child_event;
+    GList *children;
+
+    g_return_val_if_fail (widget != NULL, FALSE);
+    g_return_val_if_fail (GTK_IS_PIZZA (widget), FALSE);
+    g_return_val_if_fail (event != NULL, FALSE);
+
+    pizza = GTK_PIZZA (widget);
+
+/*
+    if (event->window == widget->window)
+    {
+        gtk_pizza_draw_border( pizza );
+        return FALSE;
+    }
+*/
+
+    if (event->window != pizza->bin_window)
+        return FALSE;
+
+    children = pizza->children;
+    while (children)
+    {
+       child = children->data;
+       children = children->next;
+
+        child_event = *event;
+
+       if (GTK_WIDGET_NO_WINDOW (child->widget) &&
+           GTK_WIDGET_DRAWABLE (child->widget) &&
+           gtk_widget_intersect (child->widget, &event->area, &child_event.area))
        {
        {
-         child_allocation.x = child->x + border_width;
-         child_allocation.y = child->y + border_width;
-         child_allocation.width = child->widget->requisition.width;
-         child_allocation.height = child->widget->requisition.height;
-         gtk_widget_size_allocate (child->widget, &child_allocation);
+           gtk_widget_event (child->widget, (GdkEvent*) &child_event);
        }
     }
        }
     }
+
+    return FALSE;
 }
 
 static void
 }
 
 static void
-gtk_myfixed_paint (GtkWidget    *widget,
-                GdkRectangle *area)
+gtk_pizza_add (GtkContainer *container,
+              GtkWidget    *widget)
 {
 {
-  g_return_if_fail (widget != NULL);
-  g_return_if_fail (GTK_IS_MYFIXED (widget));
-  g_return_if_fail (area != NULL);
+    g_return_if_fail (container != NULL);
+    g_return_if_fail (GTK_IS_PIZZA (container));
+    g_return_if_fail (widget != NULL);
 
 
-  if (GTK_WIDGET_DRAWABLE (widget))
-      gdk_window_clear_area (widget->window,
-                            area->x, area->y,
-                            area->width, area->height);
+    gtk_pizza_put (GTK_PIZZA (container), widget, 0, 0, 20, 20 );
 }
 
 static void
 }
 
 static void
-gtk_myfixed_draw (GtkWidget    *widget,
-               GdkRectangle *area)
+gtk_pizza_remove (GtkContainer *container,
+                   GtkWidget    *widget)
 {
 {
-  GtkMyFixed *myfixed;
-  GtkMyFixedChild *child;
-  GdkRectangle child_area;
-  GList *children;
+    GtkPizza *pizza;
+    GtkPizzaChild *child;
+    GList *children;
 
 
-  g_return_if_fail (widget != NULL);
-  g_return_if_fail (GTK_IS_MYFIXED (widget));
+    g_return_if_fail (container != NULL);
+    g_return_if_fail (GTK_IS_PIZZA (container));
+    g_return_if_fail (widget != NULL);
+
+    pizza = GTK_PIZZA (container);
 
 
-  if (GTK_WIDGET_DRAWABLE (widget))
+    children = pizza->children;
+    while (children)
     {
     {
-      myfixed = GTK_MYFIXED (widget);
-      gtk_myfixed_paint (widget, area);
+        child = children->data;
 
 
-      children = myfixed->children;
-      while (children)
+        if (child->widget == widget)
        {
        {
-         child = children->data;
-         children = children->next;
+           gtk_widget_unparent (widget);
 
 
-         if (gtk_widget_intersect (child->widget, area, &child_area))
-           gtk_widget_draw (child->widget, &child_area);
+            /* security checks */
+            g_return_if_fail (GTK_IS_WIDGET (widget));
+  
+           pizza->children = g_list_remove_link (pizza->children, children);
+           g_list_free (children);
+           g_free (child);
+
+            /* security checks */
+           g_return_if_fail (GTK_IS_WIDGET (widget));
+    
+            GTK_PRIVATE_UNSET_FLAG (widget, GTK_IS_OFFSCREEN);
+           
+           break;
        }
        }
+
+        children = children->next;
     }
 }
 
     }
 }
 
-static gint
-gtk_myfixed_expose (GtkWidget      *widget,
-                 GdkEventExpose *event)
+static void
+gtk_pizza_forall (GtkContainer *container,
+                  gboolean      include_internals,
+                  GtkCallback   callback,
+                  gpointer      callback_data)
 {
 {
-  GtkMyFixed *myfixed;
-  GtkMyFixedChild *child;
-  GdkEventExpose child_event;
-  GList *children;
+    GtkPizza *pizza;
+    GtkPizzaChild *child;
+    GList *children;
 
 
-  g_return_val_if_fail (widget != NULL, FALSE);
-  g_return_val_if_fail (GTK_IS_MYFIXED (widget), FALSE);
-  g_return_val_if_fail (event != NULL, FALSE);
+    g_return_if_fail (container != NULL);
+    g_return_if_fail (GTK_IS_PIZZA (container));
+    g_return_if_fail (callback != NULL);
 
 
-  if (GTK_WIDGET_DRAWABLE (widget))
+    pizza = GTK_PIZZA (container);
+
+    children = pizza->children;
+    while (children)
     {
     {
-      myfixed = GTK_MYFIXED (widget);
+        child = children->data;
+        children = children->next;
 
 
-      child_event = *event;
+        (* callback) (child->widget, callback_data);
+    }
+}
 
 
-      children = myfixed->children;
-      while (children)
-       {
-         child = children->data;
-         children = children->next;
 
 
-         if (GTK_WIDGET_NO_WINDOW (child->widget) &&
-             gtk_widget_intersect (child->widget, &event->area, 
-                                   &child_event.area))
-           gtk_widget_event (child->widget, (GdkEvent*) &child_event);
+/* Operations on children
+ */
+
+static void
+gtk_pizza_position_child (GtkPizza      *pizza,
+                          GtkPizzaChild *child)
+{
+    gint x;
+    gint y;
+
+    x = child->x - pizza->xoffset;
+    y = child->y - pizza->yoffset;
+
+    if (IS_ONSCREEN (x,y))
+    {
+        if (GTK_WIDGET_MAPPED (pizza) &&
+         GTK_WIDGET_VISIBLE (child->widget))
+       {
+           if (!GTK_WIDGET_MAPPED (child->widget))
+               gtk_widget_map (child->widget);
        }
        }
+
+        if (GTK_WIDGET_IS_OFFSCREEN (child->widget))
+           GTK_PRIVATE_UNSET_FLAG (child->widget, GTK_IS_OFFSCREEN);
     }
     }
+    else
+    {
+        if (!GTK_WIDGET_IS_OFFSCREEN (child->widget))
+           GTK_PRIVATE_SET_FLAG (child->widget, GTK_IS_OFFSCREEN);
 
 
-  return FALSE;
+        if (GTK_WIDGET_MAPPED (child->widget))
+           gtk_widget_unmap (child->widget);
+    }
 }
 
 static void
 }
 
 static void
-gtk_myfixed_add (GtkContainer *container,
-              GtkWidget    *widget)
+gtk_pizza_allocate_child (GtkPizza      *pizza,
+                          GtkPizzaChild *child)
 {
 {
-  g_return_if_fail (container != NULL);
-  g_return_if_fail (GTK_IS_MYFIXED (container));
-  g_return_if_fail (widget != NULL);
+    GtkAllocation allocation;
+    GtkRequisition requisition;
+
+    allocation.x = child->x - pizza->xoffset;
+    allocation.y = child->y - pizza->yoffset;
+    gtk_widget_get_child_requisition (child->widget, &requisition);
+    allocation.width = requisition.width;
+    allocation.height = requisition.height;
+  
+    gtk_widget_size_allocate (child->widget, &allocation);
+}
 
 
-  gtk_myfixed_put (GTK_MYFIXED (container), widget, 0, 0);
+static void
+gtk_pizza_position_children (GtkPizza *pizza)
+{
+    GList *tmp_list;
+
+    tmp_list = pizza->children;
+    while (tmp_list)
+    {
+        GtkPizzaChild *child = tmp_list->data;
+        tmp_list = tmp_list->next;
+      
+        gtk_pizza_position_child (pizza, child);
+    }
 }
 
 static void
 }
 
 static void
-gtk_myfixed_remove (GtkContainer *container,
-                 GtkWidget    *widget)
+gtk_pizza_adjust_allocations_recurse (GtkWidget *widget,
+                                      gpointer   cb_data)
 {
 {
-  GtkMyFixed *myfixed;
-  GtkMyFixedChild *child;
-  GList *children;
+    GtkPizzaAdjData *data = cb_data;
 
 
-  g_return_if_fail (container != NULL);
-  g_return_if_fail (GTK_IS_MYFIXED (container));
-  g_return_if_fail (widget != NULL);
+    widget->allocation.x += data->dx;
+    widget->allocation.y += data->dy;
+
+    if (GTK_WIDGET_NO_WINDOW (widget) && GTK_IS_CONTAINER (widget))
+    {
+        gtk_container_forall (GTK_CONTAINER (widget), 
+                         gtk_pizza_adjust_allocations_recurse,
+                         cb_data);
+    }
+}
+
+static void
+gtk_pizza_adjust_allocations (GtkPizza *pizza,
+                              gint       dx,
+                              gint       dy)
+{
+  GList *tmp_list;
+  GtkPizzaAdjData data;
+
+  data.dx = dx;
+  data.dy = dy;
+
+  tmp_list = pizza->children;
+  while (tmp_list)
+    {
+      GtkPizzaChild *child = tmp_list->data;
+      tmp_list = tmp_list->next;
+      
+      child->widget->allocation.x += dx;
+      child->widget->allocation.y += dy;
+
+      if (GTK_WIDGET_NO_WINDOW (child->widget) &&
+         GTK_IS_CONTAINER (child->widget))
+       gtk_container_forall (GTK_CONTAINER (child->widget), 
+                             gtk_pizza_adjust_allocations_recurse,
+                             &data);
+    }
+}
+  
+/* Callbacks */
+
+/* Send a synthetic expose event to the widget
+ */
+static void
+gtk_pizza_expose_area (GtkPizza    *pizza,
+                       gint x, gint y, gint width, gint height)
+{
+  if (pizza->visibility == GDK_VISIBILITY_UNOBSCURED)
+    {
+      GdkEventExpose event;
+      
+      event.type = GDK_EXPOSE;
+      event.send_event = TRUE;
+      event.window = pizza->bin_window;
+      event.count = 0;
+      
+      event.area.x = x;
+      event.area.y = y;
+      event.area.width = width;
+      event.area.height = height;
+      
+      gdk_window_ref (event.window);
+      gtk_widget_event (GTK_WIDGET (pizza), (GdkEvent *)&event);
+      gdk_window_unref (event.window);
+    }
+}
+
+/* This function is used to find events to process while scrolling
+ */
+
+static Bool 
+gtk_pizza_expose_predicate (Display *display, 
+                 XEvent  *xevent, 
+                 XPointer arg)
+{
+  if ((xevent->type == Expose) || 
+      ((xevent->xany.window == *(Window *)arg) &&
+       (xevent->type == ConfigureNotify)))
+    return True;
+  else
+    return False;
+}
+
+/* This is the main routine to do the scrolling. Scrolling is
+ * done by "Guffaw" scrolling, as in the Mozilla XFE, with
+ * a few modifications.
+ * 
+ * The main improvement is that we keep track of whether we
+ * are obscured or not. If not, we ignore the generated expose
+ * events and instead do the exposes ourself, without having
+ * to wait for a roundtrip to the server. This also provides
+ * a limited form of expose-event compression, since we do
+ * the affected area as one big chunk.
+ */
+
+void
+gtk_pizza_scroll (GtkPizza *pizza, gint dx, gint dy)
+{
+  GtkWidget *widget;
+  XEvent xevent;
 
 
-  myfixed = GTK_MYFIXED (container);
+  gint x,y,w,h,border;
+  
+  widget = GTK_WIDGET (pizza);
+
+  pizza->xoffset += dx;
+  pizza->yoffset += dy;
 
 
-  children = myfixed->children;
-  while (children)
+  if (!GTK_WIDGET_MAPPED (pizza))
     {
     {
-      child = children->data;
+      gtk_pizza_position_children (pizza);
+      return;
+    }
 
 
-      if (child->widget == widget)
+  gtk_pizza_adjust_allocations (pizza, -dx, -dy);
+
+  if (pizza->shadow_type == GTK_MYSHADOW_NONE)
+    border = 0;
+  else
+  if (pizza->shadow_type == GTK_MYSHADOW_THIN)
+    border = 1;
+  else
+    border = 2;
+       
+  x = 0;
+  y = 0;
+  w = widget->allocation.width - 2*border;
+  h = widget->allocation.height - 2*border;
+  
+  if (dx > 0)
+    {
+      if (gravity_works)
        {
        {
-         gtk_widget_unparent (widget);
+         gdk_window_resize (pizza->bin_window,
+                            w + dx,
+                            h);
+         gdk_window_move   (pizza->bin_window, x-dx, y);
+         gdk_window_move_resize (pizza->bin_window, x, y, w, h );
+       }
+      else
+       {
+         /* FIXME */
+       }
 
 
-         myfixed->children = g_list_remove_link (myfixed->children, children);
-         g_list_free (children);
-         g_free (child);
+      gtk_pizza_expose_area (pizza, 
+                             MAX ((gint)w - dx, 0),
+                             0,
+                             MIN (dx, w),
+                             h);
+    }
+  else if (dx < 0)
+    {
+      if (gravity_works)
+       {
+         gdk_window_move_resize (pizza->bin_window,
+                                 x + dx, 
+                                 y,
+                                 w - dx,
+                                 h);
+         gdk_window_move   (pizza->bin_window, x, y);
+         gdk_window_resize (pizza->bin_window, w, h );
+       }
+      else
+       {
+         /* FIXME */
+       }
 
 
-         if (GTK_WIDGET_VISIBLE (widget) && GTK_WIDGET_VISIBLE (container))
-           gtk_widget_queue_resize (GTK_WIDGET (container));
+      gtk_pizza_expose_area (pizza,
+                             0,
+                             0,
+                             MIN (-dx, w),
+                             h);
+    }
 
 
-         break;
+  if (dy > 0)
+    {
+      if (gravity_works)
+       {
+         gdk_window_resize (pizza->bin_window, w, h + dy);
+         gdk_window_move   (pizza->bin_window, x, y-dy);
+         gdk_window_move_resize (pizza->bin_window,
+                                 x, y, w, h );
+       }
+      else
+       {
+         /* FIXME */
        }
 
        }
 
-      children = children->next;
+      gtk_pizza_expose_area (pizza, 
+                             0,
+                             MAX ((gint)h - dy, 0),
+                             w,
+                             MIN (dy, h));
+    }
+  else if (dy < 0)
+    {
+      if (gravity_works)
+       {
+         gdk_window_move_resize (pizza->bin_window,
+                                 x, y+dy, w, h - dy );
+         gdk_window_move   (pizza->bin_window, x, y);
+         gdk_window_resize (pizza->bin_window, w, h );
+       }
+      else
+       {
+         /* FIXME */
+       }
+      gtk_pizza_expose_area (pizza, 
+                             0,
+                             0,
+                             w,
+                             MIN (-dy, (gint)h));
+    }
+
+  gtk_pizza_position_children (pizza);
+
+  /* We have to make sure that all exposes from this scroll get
+   * processed before we scroll again, or the expose events will
+   * have invalid coordinates.
+   *
+   * We also do expose events for other windows, since otherwise
+   * their updating will fall behind the scrolling 
+   *
+   * This also avoids a problem in pre-1.0 GTK where filters don't
+   * have access to configure events that were compressed.
+   */
+
+  gdk_flush();
+  while (XCheckIfEvent(GDK_WINDOW_XDISPLAY (pizza->bin_window),
+                      &xevent,
+                      gtk_pizza_expose_predicate,
+                      (XPointer)&GDK_WINDOW_XWINDOW (pizza->bin_window)))
+    {
+      GdkEvent event;
+      GtkWidget *event_widget;
+
+      if ((xevent.xany.window == GDK_WINDOW_XWINDOW (pizza->bin_window)) &&
+         (gtk_pizza_filter (&xevent, &event, pizza) == GDK_FILTER_REMOVE))
+       continue;
+      
+      if (xevent.type == Expose)
+       {
+         event.expose.window = gdk_window_lookup (xevent.xany.window);
+         gdk_window_get_user_data (event.expose.window, 
+                                   (gpointer *)&event_widget);
+
+         if (event_widget)
+           {
+             event.expose.type = GDK_EXPOSE;
+             event.expose.area.x = xevent.xexpose.x;
+             event.expose.area.y = xevent.xexpose.y;
+             event.expose.area.width = xevent.xexpose.width;
+             event.expose.area.height = xevent.xexpose.height;
+             event.expose.count = xevent.xexpose.count;
+             
+             gdk_window_ref (event.expose.window);
+             gtk_widget_event (event_widget, &event);
+             gdk_window_unref (event.expose.window);
+           }
+       }
     }
 }
 
     }
 }
 
-static void
-gtk_myfixed_foreach (GtkContainer *container,
-#if (GTK_MINOR_VERSION == 1)
-                  gboolean      include_internals,
-#endif
-                  GtkCallback   callback,
-                  gpointer      callback_data)
+/* The main event filter. Actually, we probably don't really need
+ * to install this as a filter at all, since we are calling it
+ * directly above in the expose-handling hack. But in case scrollbars
+ * are fixed up in some manner...
+ *
+ * This routine identifies expose events that are generated when
+ * we've temporarily moved the bin_window_origin, and translates
+ * them or discards them, depending on whether we are obscured
+ * or not.
+ */
+static GdkFilterReturn 
+gtk_pizza_filter (GdkXEvent *gdk_xevent,
+                  GdkEvent  *event,
+                  gpointer   data)
 {
 {
-  GtkMyFixed *myfixed;
-  GtkMyFixedChild *child;
-  GList *children;
+  XEvent *xevent;
+  GtkPizza *pizza;
+
+  xevent = (XEvent *)gdk_xevent;
+  pizza = GTK_PIZZA (data);
+
+  switch (xevent->type)
+    {
+    case Expose:
+      if (xevent->xexpose.serial == pizza->configure_serial)
+       {
+         if (pizza->visibility == GDK_VISIBILITY_UNOBSCURED)
+           return GDK_FILTER_REMOVE;
+         else
+           {
+             xevent->xexpose.x += pizza->scroll_x;
+             xevent->xexpose.y += pizza->scroll_y;
+             
+             break;
+           }
+       }
+      break;
+      
+    case ConfigureNotify:
+       if ((xevent->xconfigure.x != 0) || (xevent->xconfigure.y != 0))
+       {
+         pizza->configure_serial = xevent->xconfigure.serial;
+         pizza->scroll_x = xevent->xconfigure.x;
+         pizza->scroll_y = xevent->xconfigure.y;
+       }
+      break;
+    }
+  
+  return GDK_FILTER_CONTINUE;
+}
 
 
-  g_return_if_fail (container != NULL);
-  g_return_if_fail (GTK_IS_MYFIXED (container));
-  g_return_if_fail (callback != NULL);
+/* Although GDK does have a GDK_VISIBILITY_NOTIFY event,
+ * there is no corresponding event in GTK, so we have
+ * to get the events from a filter
+ */
+static GdkFilterReturn 
+gtk_pizza_main_filter (GdkXEvent *gdk_xevent,
+                       GdkEvent  *event,
+                       gpointer   data)
+{
+  XEvent *xevent;
+  GtkPizza *pizza;
 
 
-  myfixed = GTK_MYFIXED (container);
+  xevent = (XEvent *)gdk_xevent;
+  pizza = GTK_PIZZA (data);
 
 
-  children = myfixed->children;
-  while (children)
+  if (xevent->type == VisibilityNotify)
     {
     {
-      child = children->data;
-      children = children->next;
+      switch (xevent->xvisibility.state)
+       {
+       case VisibilityFullyObscured:
+         pizza->visibility = GDK_VISIBILITY_FULLY_OBSCURED;
+         break;
 
 
-      (* callback) (child->widget, callback_data);
+       case VisibilityPartiallyObscured:
+         pizza->visibility = GDK_VISIBILITY_PARTIAL;
+         break;
+
+       case VisibilityUnobscured:
+         pizza->visibility = GDK_VISIBILITY_UNOBSCURED;
+         break;
+       }
+
+      return GDK_FILTER_REMOVE;
     }
     }
+
+  
+  return GDK_FILTER_CONTINUE;
 }
 
 
 }
 
 
+
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */
wxWidgets (Impactor)