typedef struct _GtkWidgetClass GtkWidgetClass;

struct _GtkWidgetClass
{
  GtkObjectClass parent_class;
  
  guint activate_signal;

  guint set_scroll_adjustments_signal;
  
  /* Basics */
  void (* show)                (GtkWidget      *widget);
  void (* show_all)            (GtkWidget      *widget);
  void (* hide)                (GtkWidget      *widget);
  void (* hide_all)            (GtkWidget      *widget);
  void (* map)                 (GtkWidget      *widget);
  void (* unmap)               (GtkWidget      *widget);
  void (* realize)             (GtkWidget      *widget);
  void (* unrealize)           (GtkWidget      *widget);
  void (* draw)                (GtkWidget      *widget,
                                GdkRectangle   *area);
  void (* draw_focus)          (GtkWidget      *widget);
  void (* draw_default)        (GtkWidget      *widget);
  void (* size_request)        (GtkWidget      *widget,
                                GtkRequisition *requisition);
  void (* size_allocate)       (GtkWidget      *widget,
                                GtkAllocation  *allocation);
  void (* state_changed)       (GtkWidget      *widget,
                                GtkStateType    previous_state);
  void (* parent_set)          (GtkWidget      *widget,
                                GtkWidget      *previous_parent);
  void (* style_set)           (GtkWidget      *widget,
                                GtkStyle       *previous_style);
  
  /* Accelerators */
  gint (* add_accelerator)     (GtkWidget      *widget,
                                guint           accel_signal_id,
                                GtkAccelGroup  *accel_group,
                                guint           accel_key,
                                GdkModifierType accel_mods,
                                GtkAccelFlags   accel_flags);
  void (* remove_accelerator)  (GtkWidget      *widget,
                                GtkAccelGroup  *accel_group,
                                guint           accel_key,
                                GdkModifierType accel_mods);

  /* Explicit focus */
  void (* grab_focus)          (GtkWidget      *widget);
  
  /* Events */
  gint (* event)                   (GtkWidget          *widget,
                                    GdkEvent           *event);
  gint (* button_press_event)      (GtkWidget          *widget,
                                    GdkEventButton     *event);
  gint (* button_release_event)    (GtkWidget          *widget,
                                    GdkEventButton     *event);
  gint (* motion_notify_event)     (GtkWidget          *widget,
                                    GdkEventMotion     *event);
  gint (* delete_event)            (GtkWidget          *widget,
                                    GdkEventAny        *event);
  gint (* destroy_event)           (GtkWidget          *widget,
                                    GdkEventAny        *event);
  gint (* expose_event)            (GtkWidget          *widget,
                                    GdkEventExpose     *event);
  gint (* key_press_event)         (GtkWidget          *widget,
                                    GdkEventKey        *event);
  gint (* key_release_event)       (GtkWidget          *widget,
                                    GdkEventKey        *event);
  gint (* enter_notify_event)      (GtkWidget          *widget,
                                    GdkEventCrossing   *event);
  gint (* leave_notify_event)      (GtkWidget          *widget,
                                    GdkEventCrossing   *event);
  gint (* configure_event)         (GtkWidget          *widget,
                                    GdkEventConfigure  *event);
  gint (* focus_in_event)          (GtkWidget          *widget,
                                    GdkEventFocus      *event);
  gint (* focus_out_event)         (GtkWidget          *widget,
                                    GdkEventFocus      *event);
  gint (* map_event)               (GtkWidget          *widget,
                                    GdkEventAny        *event);
  gint (* unmap_event)             (GtkWidget          *widget,
                                    GdkEventAny        *event);
  gint (* property_notify_event)   (GtkWidget          *widget,
                                    GdkEventProperty   *event);
  gint (* selection_clear_event)   (GtkWidget          *widget,
                                    GdkEventSelection  *event);
  gint (* selection_request_event) (GtkWidget          *widget,
                                    GdkEventSelection  *event);
  gint (* selection_notify_event)  (GtkWidget          *widget,
                                    GdkEventSelection  *event);
  gint (* proximity_in_event)      (GtkWidget          *widget,
                                    GdkEventProximity  *event);
  gint (* proximity_out_event)     (GtkWidget          *widget,
                                    GdkEventProximity  *event);
  gint (* visibility_notify_event)  (GtkWidget         *widget,
                                     GdkEventVisibility *event);
  gint (* client_event)            (GtkWidget          *widget,
                                    GdkEventClient     *event);
  gint (* no_expose_event)         (GtkWidget          *widget,
                                    GdkEventAny        *event);

  /* Selection */
  void (* selection_get)           (GtkWidget          *widget,
                                    GtkSelectionData   *selection_data,
                                    guint               info,
                                    guint               time);
  void (* selection_received)      (GtkWidget          *widget,
                                    GtkSelectionData   *selection_data,
                                    guint               time);

  /* Source side drag signals */
  void (* drag_begin)              (GtkWidget          *widget,
                                    GdkDragContext     *context);
  void (* drag_end)                (GtkWidget          *widget,
                                    GdkDragContext     *context);
  void (* drag_data_get)           (GtkWidget          *widget,
                                    GdkDragContext     *context,
                                    GtkSelectionData   *selection_data,
                                    guint               info,
                                    guint               time);
  void (* drag_data_delete)        (GtkWidget          *widget,
                                    GdkDragContext     *context);

  /* Target side drag signals */
  void (* drag_leave)              (GtkWidget          *widget,
                                    GdkDragContext     *context,
                                    guint               time);
  gboolean (* drag_motion)         (GtkWidget          *widget,
                                    GdkDragContext     *context,
                                    gint                x,
                                    gint                y,
                                    guint               time);
  gboolean (* drag_drop)           (GtkWidget          *widget,
                                    GdkDragContext     *context,
                                    gint                x,
                                    gint                y,
                                    guint               time);
  void (* drag_data_received)      (GtkWidget          *widget,
                                    GdkDragContext     *context,
                                    gint                x,
                                    gint                y,
                                    GtkSelectionData   *selection_data,
                                    guint               info,
                                    guint               time);
  
  /* Action signals */
  void (* debug_msg)               (GtkWidget          *widget,
                                    const gchar        *string);

  /* Padding for future expansion */
  GtkFunction pad1;
  GtkFunction pad2;
  GtkFunction pad3;
  GtkFunction pad4;
};