gtk2/gtk/gtkmenu.c

/* GTK - The GIMP Toolkit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
#include <ctype.h>
#include "gdk/gdkkeysyms.h"
#include "gtkmain.h"
#include "gtkmenu.h"
#include "gtkmenuitem.h"
#include "gtksignal.h"


#define MENU_ITEM_CLASS(w)   GTK_MENU_ITEM_CLASS (GTK_OBJECT (w)->klass)
#define	MENU_NEEDS_RESIZE(m) GTK_MENU_SHELL (m)->menu_flag

typedef struct _GtkMenuAttachData	GtkMenuAttachData;

struct _GtkMenuAttachData
{
  GtkWidget *attach_widget;
  GtkMenuDetachFunc detacher;
};


static void gtk_menu_class_init	    (GtkMenuClass      *klass);
static void gtk_menu_init	    (GtkMenu	       *menu);
static void gtk_menu_destroy	    (GtkObject	       *object);
static void gtk_menu_show	    (GtkWidget	       *widget);
static void gtk_menu_map	    (GtkWidget	       *widget);
static void gtk_menu_unmap	    (GtkWidget	       *widget);
static void gtk_menu_realize	    (GtkWidget	       *widget);
static void gtk_menu_size_request   (GtkWidget	       *widget,
				     GtkRequisition    *requisition);
static void gtk_menu_size_allocate  (GtkWidget	       *widget,
				     GtkAllocation     *allocation);
static void gtk_menu_paint	    (GtkWidget	       *widget);
static void gtk_menu_draw	    (GtkWidget	       *widget,
				     GdkRectangle      *area);
static gint gtk_menu_expose	    (GtkWidget	       *widget,
				     GdkEventExpose    *event);
static gint gtk_menu_configure	    (GtkWidget	       *widget,
				     GdkEventConfigure *event);
static gint gtk_menu_key_press	    (GtkWidget	       *widget,
				     GdkEventKey       *event);
static gint gtk_menu_need_resize    (GtkContainer      *container);
static void gtk_menu_deactivate	    (GtkMenuShell      *menu_shell);
static void gtk_menu_show_all	    (GtkWidget	       *widget);
static void gtk_menu_hide_all	    (GtkWidget	       *widget);

static GtkMenuShellClass *parent_class = NULL;
static const gchar	*attach_data_key = "gtk-menu-attach-data";


GtkType
gtk_menu_get_type (void)
{
  static GtkType menu_type = 0;
  
  if (!menu_type)
    {
      GtkTypeInfo menu_info =
      {
	"GtkMenu",
	sizeof (GtkMenu),
	sizeof (GtkMenuClass),
	(GtkClassInitFunc) gtk_menu_class_init,
	(GtkObjectInitFunc) gtk_menu_init,
	(GtkArgSetFunc) NULL,
	(GtkArgGetFunc) NULL,
      };
      
      menu_type = gtk_type_unique (gtk_menu_shell_get_type (), &menu_info);
    }
  
  return menu_type;
}

static void
gtk_menu_class_init (GtkMenuClass *class)
{
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;
  GtkContainerClass *container_class;
  GtkMenuShellClass *menu_shell_class;
  
  object_class = (GtkObjectClass*) class;
  widget_class = (GtkWidgetClass*) class;
  container_class = (GtkContainerClass*) class;
  menu_shell_class = (GtkMenuShellClass*) class;
  parent_class = gtk_type_class (gtk_menu_shell_get_type ());
  
  object_class->destroy = gtk_menu_destroy;
  
  widget_class->show = gtk_menu_show;
  widget_class->map = gtk_menu_map;
  widget_class->unmap = gtk_menu_unmap;
  widget_class->realize = gtk_menu_realize;
  widget_class->draw = gtk_menu_draw;
  widget_class->size_request = gtk_menu_size_request;
  widget_class->size_allocate = gtk_menu_size_allocate;
  widget_class->expose_event = gtk_menu_expose;
  widget_class->configure_event = gtk_menu_configure;
  widget_class->key_press_event = gtk_menu_key_press;
  widget_class->show_all = gtk_menu_show_all;
  widget_class->hide_all = gtk_menu_hide_all;  
  
  container_class->need_resize = gtk_menu_need_resize;
  
  menu_shell_class->submenu_placement = GTK_LEFT_RIGHT;
  menu_shell_class->deactivate = gtk_menu_deactivate;
}

static void
gtk_menu_init (GtkMenu *menu)
{
  GTK_WIDGET_SET_FLAGS (menu, GTK_TOPLEVEL);
  
  menu->parent_menu_item = NULL;
  menu->old_active_menu_item = NULL;
  menu->accel_group = NULL;
  menu->position_func = NULL;
  menu->position_func_data = NULL;

  MENU_NEEDS_RESIZE (menu) = TRUE;
}

static void
gtk_menu_destroy (GtkObject	    *object)
{
  GtkMenuAttachData *data;
  
  g_return_if_fail (object != NULL);
  g_return_if_fail (GTK_IS_MENU (object));
  
  gtk_widget_ref (GTK_WIDGET (object));
  
  data = gtk_object_get_data (object, attach_data_key);
  if (data)
    gtk_menu_detach (GTK_MENU (object));
  
  gtk_menu_set_accel_group (GTK_MENU (object), NULL);
  
  if (GTK_OBJECT_CLASS (parent_class)->destroy)
    (* GTK_OBJECT_CLASS (parent_class)->destroy) (object);
  
  gtk_widget_unref (GTK_WIDGET (object));
}


void
gtk_menu_attach_to_widget (GtkMenu	       *menu,
			   GtkWidget	       *attach_widget,
			   GtkMenuDetachFunc	detacher)
{
  GtkMenuAttachData *data;
  
  g_return_if_fail (menu != NULL);
  g_return_if_fail (GTK_IS_MENU (menu));
  g_return_if_fail (attach_widget != NULL);
  g_return_if_fail (GTK_IS_WIDGET (attach_widget));
  g_return_if_fail (detacher != NULL);
  
  /* keep this function in sync with gtk_widget_set_parent()
   */
  
  data = gtk_object_get_data (GTK_OBJECT (menu), attach_data_key);
  if (data)
    {
      g_warning ("gtk_menu_attach_to_widget(): menu already attached to %s",
		 gtk_type_name (GTK_OBJECT_TYPE (data->attach_widget)));
      return;
    }
  
  gtk_widget_ref (GTK_WIDGET (menu));
  gtk_object_sink (GTK_OBJECT (menu));
  
  data = g_new (GtkMenuAttachData, 1);
  data->attach_widget = attach_widget;
  data->detacher = detacher;
  gtk_object_set_data (GTK_OBJECT (menu), attach_data_key, data);
  
  if (GTK_WIDGET_STATE (menu) != GTK_STATE_NORMAL)
    gtk_widget_set_state (GTK_WIDGET (menu), GTK_STATE_NORMAL);
  
  /* we don't need to set the style here, since
   * we are a toplevel widget.
   */
}

GtkWidget*
gtk_menu_get_attach_widget (GtkMenu		*menu)
{
  GtkMenuAttachData *data;
  
  g_return_val_if_fail (menu != NULL, NULL);
  g_return_val_if_fail (GTK_IS_MENU (menu), NULL);
  
  data = gtk_object_get_data (GTK_OBJECT (menu), attach_data_key);
  if (data)
    return data->attach_widget;
  return NULL;
}

void
gtk_menu_detach (GtkMenu	     *menu)
{
  GtkMenuAttachData *data;
  
  g_return_if_fail (menu != NULL);
  g_return_if_fail (GTK_IS_MENU (menu));
  
  /* keep this function in sync with gtk_widget_unparent()
   */
  data = gtk_object_get_data (GTK_OBJECT (menu), attach_data_key);
  if (!data)
    {
      g_warning ("gtk_menu_detach(): menu is not attached");
      return;
    }
  gtk_object_remove_data (GTK_OBJECT (menu), attach_data_key);
  
  data->detacher (data->attach_widget, menu);
  
  if (GTK_WIDGET_REALIZED (menu))
    gtk_widget_unrealize (GTK_WIDGET (menu));
  
  g_free (data);
  
  gtk_widget_unref (GTK_WIDGET (menu));
}

GtkWidget*
gtk_menu_new (void)
{
  return GTK_WIDGET (gtk_type_new (gtk_menu_get_type ()));
}

void
gtk_menu_append (GtkMenu   *menu,
		 GtkWidget *child)
{
  gtk_menu_shell_append (GTK_MENU_SHELL (menu), child);
}

void
gtk_menu_prepend (GtkMenu   *menu,
		  GtkWidget *child)
{
  gtk_menu_shell_prepend (GTK_MENU_SHELL (menu), child);
}

void
gtk_menu_insert (GtkMenu   *menu,
		 GtkWidget *child,
		 gint	    position)
{
  gtk_menu_shell_insert (GTK_MENU_SHELL (menu), child, position);
}

void
gtk_menu_popup (GtkMenu		    *menu,
		GtkWidget	    *parent_menu_shell,
		GtkWidget	    *parent_menu_item,
		GtkMenuPositionFunc  func,
		gpointer	     data,
		guint		     button,
		guint32		     activate_time)
{
  GtkWidget *xgrab_shell;
  GtkWidget *parent;
  
  g_return_if_fail (menu != NULL);
  g_return_if_fail (GTK_IS_MENU (menu));
  
  GTK_MENU_SHELL (menu)->parent_menu_shell = parent_menu_shell;
  GTK_MENU_SHELL (menu)->active = TRUE;
  GTK_MENU_SHELL (menu)->button = button;
  
  menu->parent_menu_item = parent_menu_item;
  menu->position_func = func;
  menu->position_func_data = data;
  GTK_MENU_SHELL (menu)->activate_time = activate_time;
  
  gtk_widget_show (GTK_WIDGET (menu));
  
  /* Find the last viewable ancestor, and make an X grab on it
   */
  parent = GTK_WIDGET (menu);
  xgrab_shell = NULL;
  while (parent)
    {
      gboolean viewable = TRUE;
      GtkWidget *tmp = parent;
      
      while (tmp)
	{
	  if (!GTK_WIDGET_MAPPED (tmp))
	    {
	      viewable = FALSE;
	      break;
	    }
	  tmp = tmp->parent;
	}
      
      if (viewable)
	xgrab_shell = parent;
      
      parent = GTK_MENU_SHELL (parent)->parent_menu_shell;
    }
  
  if (xgrab_shell && (!GTK_MENU_SHELL (xgrab_shell)->have_xgrab))
    {
      GdkCursor *cursor = gdk_cursor_new (GDK_ARROW);
      
      GTK_MENU_SHELL (xgrab_shell)->have_xgrab = 
	(gdk_pointer_grab (xgrab_shell->window, TRUE,
			   GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
			   GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK,
			   NULL, cursor, activate_time) == 0);
      gdk_cursor_destroy (cursor);
    }
  
  gtk_grab_add (GTK_WIDGET (menu));
}

void
gtk_menu_popdown (GtkMenu *menu)
{
  GtkMenuShell *menu_shell;
  
  g_return_if_fail (menu != NULL);
  g_return_if_fail (GTK_IS_MENU (menu));
  
  menu_shell = GTK_MENU_SHELL (menu);
  
  menu_shell->parent_menu_shell = NULL;
  menu_shell->active = FALSE;
  
  if (menu_shell->active_menu_item)
    {
      menu->old_active_menu_item = menu_shell->active_menu_item;
      gtk_menu_item_deselect (GTK_MENU_ITEM (menu_shell->active_menu_item));
      menu_shell->active_menu_item = NULL;
    }
  
  /* The X Grab, if present, will automatically be removed when we hide
   * the window */
  gtk_widget_hide (GTK_WIDGET (menu));
  menu_shell->have_xgrab = FALSE;
  
  gtk_grab_remove (GTK_WIDGET (menu));
}

GtkWidget*
gtk_menu_get_active (GtkMenu *menu)
{
  GtkWidget *child;
  GList *children;
  
  g_return_val_if_fail (menu != NULL, NULL);
  g_return_val_if_fail (GTK_IS_MENU (menu), NULL);
  
  if (!menu->old_active_menu_item)
    {
      child = NULL;
      children = GTK_MENU_SHELL (menu)->children;
      
      while (children)
	{
	  child = children->data;
	  children = children->next;
	  
	  if (GTK_BIN (child)->child)
	    break;
	  child = NULL;
	}
      
      menu->old_active_menu_item = child;
    }
  
  return menu->old_active_menu_item;
}

void
gtk_menu_set_active (GtkMenu *menu,
		     guint    index)
{
  GtkWidget *child;
  GList *tmp_list;
  
  g_return_if_fail (menu != NULL);
  g_return_if_fail (GTK_IS_MENU (menu));
  
  tmp_list = g_list_nth (GTK_MENU_SHELL (menu)->children, index);
  if (tmp_list)
    {
      child = tmp_list->data;
      if (GTK_BIN (child)->child)
	menu->old_active_menu_item = child;
    }
}

void
gtk_menu_set_accel_group (GtkMenu	*menu,
			  GtkAccelGroup *accel_group)
{
  g_return_if_fail (menu != NULL);
  g_return_if_fail (GTK_IS_MENU (menu));
  
  if (menu->accel_group != accel_group)
    {
      if (menu->accel_group)
	gtk_accel_group_unref (menu->accel_group);
      menu->accel_group = accel_group;
      if (menu->accel_group)
	gtk_accel_group_ref (menu->accel_group);
    }
}


static void
gtk_menu_show (GtkWidget *widget)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_MENU (widget));
  
  GTK_WIDGET_SET_FLAGS (widget, GTK_VISIBLE);
  if (MENU_NEEDS_RESIZE (widget))
    gtk_container_need_resize (GTK_CONTAINER (widget));
  gtk_widget_map (widget);
}

void
gtk_menu_reposition (GtkMenu *menu)
{
  GtkWidget *widget;

  g_return_if_fail (menu != NULL);
  g_return_if_fail (GTK_IS_MENU (menu));

  widget = GTK_WIDGET (menu);
  
  if (GTK_WIDGET_DRAWABLE (menu))
    {
      gint x, y;
      
      gdk_window_get_pointer (NULL, &x, &y, NULL);
      
      if (menu->position_func)
	(* menu->position_func) (menu, &x, &y, menu->position_func_data);
      else
	{
	  gint screen_width;
	  gint screen_height;
	  
	  screen_width = gdk_screen_width ();
	  screen_height = gdk_screen_height ();
	  
	  x -= 2;
	  y -= 2;
	  
	  if ((x + widget->requisition.width) > screen_width)
	    x -= ((x + widget->requisition.width) - screen_width);
	  if (x < 0)
	    x = 0;
	  if ((y + widget->requisition.height) > screen_height)
	    y -= ((y + widget->requisition.height) - screen_height);
	  if (y < 0)
	    y = 0;
	}
      
      gdk_window_move (widget->window, x, y);
    }
}

static void
gtk_menu_map (GtkWidget *widget)
{
  GtkMenu *menu;
  GtkMenuShell *menu_shell;
  GtkWidget *child;
  GList *children;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_MENU (widget));
  
  menu = GTK_MENU (widget);
  menu_shell = GTK_MENU_SHELL (widget);
  GTK_WIDGET_SET_FLAGS (menu_shell, GTK_MAPPED);

  gtk_menu_reposition (menu);
  
  children = menu_shell->children;
  while (children)
    {
      child = children->data;
      children = children->next;
      
      if (GTK_WIDGET_VISIBLE (child) && !GTK_WIDGET_MAPPED (child))
	gtk_widget_map (child);
    }
  
  gdk_window_show (widget->window);
}

static void
gtk_menu_unmap (GtkWidget *widget)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_MENU (widget));
  
  GTK_WIDGET_UNSET_FLAGS (widget, GTK_MAPPED);
  gdk_window_hide (widget->window);
}

static void
gtk_menu_realize (GtkWidget *widget)
{
  GdkWindowAttr attributes;
  gint attributes_mask;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_MENU (widget));
  
  GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);
  
  attributes.x = widget->allocation.x;
  attributes.y = widget->allocation.y;
  attributes.width = widget->allocation.width;
  attributes.height = widget->allocation.height;
  attributes.wclass = GDK_INPUT_OUTPUT;
  attributes.visual = gtk_widget_get_visual (widget);
  attributes.colormap = gtk_widget_get_colormap (widget);
  attributes.window_type = GDK_WINDOW_TEMP;
  attributes.event_mask = gtk_widget_get_events (widget);
  attributes.event_mask |= (GDK_EXPOSURE_MASK |
			    GDK_KEY_PRESS_MASK |
			    GDK_STRUCTURE_MASK);
  
  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;
  widget->window = gdk_window_new (NULL, &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);
}

static void
gtk_menu_size_request (GtkWidget      *widget,
		       GtkRequisition *requisition)
{
  GtkMenu *menu;
  GtkMenuShell *menu_shell;
  GtkWidget *child;
  GList *children;
  guint max_toggle_size;
  guint max_accel_width;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_MENU (widget));
  g_return_if_fail (requisition != NULL);
  
  menu = GTK_MENU (widget);
  menu_shell = GTK_MENU_SHELL (widget);
  
  requisition->width = 0;
  requisition->height = 0;
  
  max_toggle_size = 0;
  max_accel_width = 0;
  
  children = menu_shell->children;
  while (children)
    {
      child = children->data;
      children = children->next;
      
      if (GTK_WIDGET_VISIBLE (child))
	{
	  GTK_MENU_ITEM (child)->show_submenu_indicator = TRUE;
	  gtk_widget_size_request (child, &child->requisition);
	  
	  requisition->width = MAX (requisition->width, child->requisition.width);
	  requisition->height += child->requisition.height;
	  
	  max_toggle_size = MAX (max_toggle_size, MENU_ITEM_CLASS (child)->toggle_size);
	  max_accel_width = MAX (max_accel_width, GTK_MENU_ITEM (child)->accelerator_width);
	}
    }
  
  requisition->width += max_toggle_size + max_accel_width;
  requisition->width += (GTK_CONTAINER (menu)->border_width +
			 widget->style->klass->xthickness) * 2;
  requisition->height += (GTK_CONTAINER (menu)->border_width +
			  widget->style->klass->ythickness) * 2;
  
  children = menu_shell->children;
  while (children)
    {
      child = children->data;
      children = children->next;
      
      GTK_MENU_ITEM (child)->toggle_size = max_toggle_size;
    }
}

static void
gtk_menu_size_allocate (GtkWidget     *widget,
			GtkAllocation *allocation)
{
  GtkMenu *menu;
  GtkMenuShell *menu_shell;
  GtkWidget *child;
  GtkAllocation child_allocation;
  GList *children;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_MENU (widget));
  g_return_if_fail (allocation != NULL);
  
  menu = GTK_MENU (widget);
  menu_shell = GTK_MENU_SHELL (widget);
  
  widget->allocation = *allocation;

  if (menu_shell->children)
    {
      child_allocation.x = (GTK_CONTAINER (menu)->border_width +
			    widget->style->klass->xthickness);
      child_allocation.y = (GTK_CONTAINER (menu)->border_width +
			    widget->style->klass->ythickness);
      child_allocation.width = MAX (1, allocation->width - child_allocation.x * 2);
      
      children = menu_shell->children;
      while (children)
	{
	  child = children->data;
	  children = children->next;
	  
	  if (GTK_WIDGET_VISIBLE (child))
	    {
	      child_allocation.height = child->requisition.height;
	      
	      gtk_widget_size_allocate (child, &child_allocation);
	      gtk_widget_queue_draw (child);
	      
	      child_allocation.y += child_allocation.height;
	    }
	}
    }

  if (GTK_WIDGET_REALIZED (widget))
    {
      gdk_window_resize (widget->window,
			 widget->requisition.width,
			 widget->requisition.height);
    }
}

static void
gtk_menu_paint (GtkWidget *widget)
{
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_MENU (widget));
  
  if (GTK_WIDGET_DRAWABLE (widget))
    {
      gtk_draw_shadow (widget->style,
		       widget->window,
		       GTK_STATE_NORMAL,
		       GTK_SHADOW_OUT,
		       0, 0,
		       widget->allocation.width,
		       widget->allocation.height);
    }
}

static void
gtk_menu_draw (GtkWidget    *widget,
	       GdkRectangle *area)
{
  GtkMenuShell *menu_shell;
  GtkWidget *child;
  GdkRectangle child_area;
  GList *children;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_MENU (widget));
  g_return_if_fail (area != NULL);
  
  if (GTK_WIDGET_DRAWABLE (widget))
    {
      gtk_menu_paint (widget);
      
      menu_shell = GTK_MENU_SHELL (widget);
      
      children = menu_shell->children;
      while (children)
	{
	  child = children->data;
	  children = children->next;
	  
	  if (gtk_widget_intersect (child, area, &child_area))
	    gtk_widget_draw (child, &child_area);
	}
    }
}

static gint
gtk_menu_expose (GtkWidget	*widget,
		 GdkEventExpose *event)
{
  GtkMenuShell *menu_shell;
  GtkWidget *child;
  GdkEventExpose child_event;
  GList *children;
  
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_MENU (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);
  
  if (GTK_WIDGET_DRAWABLE (widget))
    {
      gtk_menu_paint (widget);
      
      menu_shell = GTK_MENU_SHELL (widget);
      child_event = *event;
      
      children = menu_shell->children;
      while (children)
	{
	  child = children->data;
	  children = children->next;
	  
	  if (GTK_WIDGET_NO_WINDOW (child) &&
	      gtk_widget_intersect (child, &event->area, &child_event.area))
	    gtk_widget_event (child, (GdkEvent*) &child_event);
	}
    }
  
  return FALSE;
}

static gint
gtk_menu_configure (GtkWidget	      *widget,
		    GdkEventConfigure *event)
{
  GtkAllocation allocation;
  
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_MENU (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);
  
  /* If the window was merely moved, do nothing */
  if ((widget->allocation.width == event->width) &&
      (widget->allocation.height == event->height))
    return FALSE;
  
  if (MENU_NEEDS_RESIZE (widget))
    {
      MENU_NEEDS_RESIZE (widget) = FALSE;
      
      allocation.x = 0;
      allocation.y = 0;
      allocation.width = event->width;
      allocation.height = event->height;
      
      gtk_widget_size_allocate (widget, &allocation);
    }
  
  return FALSE;
}

static gint
gtk_menu_key_press (GtkWidget	*widget,
		    GdkEventKey *event)
{
  gboolean delete;
  
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_MENU (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);
  
  delete = (event->keyval == GDK_Delete ||
	    event->keyval == GDK_KP_Delete ||
	    event->keyval == GDK_BackSpace);
  
  if (delete || gtk_accelerator_valid (event->keyval, event->keyval))
    {
      GtkMenuShell *menu_shell;
      
      menu_shell = GTK_MENU_SHELL (widget);
      
      if (menu_shell->active_menu_item &&
	  GTK_BIN (menu_shell->active_menu_item)->child &&
	  GTK_MENU_ITEM (menu_shell->active_menu_item)->submenu == NULL)
	{
	  GtkMenuItem *menu_item;
	  GtkAccelGroup *accel_group;
	  
	  menu_item = GTK_MENU_ITEM (menu_shell->active_menu_item);
	  
	  if (!GTK_MENU (widget)->accel_group)
	    accel_group = gtk_accel_group_get_default ();
	  else
	    accel_group = GTK_MENU (widget)->accel_group;

	  gtk_widget_remove_accelerators (GTK_WIDGET (menu_item),
					  gtk_signal_name (menu_item->accelerator_signal),
					  TRUE);
	  
	  if (!delete &&
	      0 == gtk_widget_accelerator_signal (GTK_WIDGET (menu_item),
						  accel_group,
						  event->keyval,
						  event->state))
	    {
	      GSList *slist;
	      
	      slist = gtk_accel_group_entries_from_object (GTK_OBJECT (menu_item));
	      while (slist)
		{
		  GtkAccelEntry *ac_entry;
		  
		  ac_entry = slist->data;
		  
		  if (ac_entry->signal_id == menu_item->accelerator_signal)
		    break;
		  
		  slist = slist->next;
		}

	      if (!slist)
		gtk_widget_add_accelerator (GTK_WIDGET (menu_item),
					    gtk_signal_name (menu_item->accelerator_signal),
					    accel_group,
					    event->keyval,
					    event->state,
					    GTK_ACCEL_VISIBLE);
	    }
	}
    }
  
  return FALSE;
}

static gint
gtk_menu_need_resize (GtkContainer *container)
{
  GtkAllocation allocation;
  GtkWidget *widget;
  
  g_return_val_if_fail (container != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_MENU (container), FALSE);

  widget = GTK_WIDGET (container);
  
  if (GTK_WIDGET_VISIBLE (container))
    {
      MENU_NEEDS_RESIZE (container) = FALSE;
      
      gtk_widget_size_request (widget, &widget->requisition);
      
      allocation.x = widget->allocation.x;
      allocation.y = widget->allocation.y;
      allocation.width = widget->requisition.width;
      allocation.height = widget->requisition.height;
      
      gtk_widget_size_allocate (widget, &allocation);
    }
  else
    MENU_NEEDS_RESIZE (container) = TRUE;
  
  return FALSE;
}

static void
gtk_menu_deactivate (GtkMenuShell *menu_shell)
{
  GtkWidget *parent;
  
  g_return_if_fail (menu_shell != NULL);
  g_return_if_fail (GTK_IS_MENU (menu_shell));
  
  parent = menu_shell->parent_menu_shell;
  
  menu_shell->activate_time = 0;
  gtk_menu_popdown (GTK_MENU (menu_shell));
  
  if (parent)
    gtk_menu_shell_deactivate (GTK_MENU_SHELL (parent));
}


static void
gtk_menu_show_all (GtkWidget *widget)
{
  GtkContainer *container;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_MENU (widget));
  container = GTK_CONTAINER (widget);
  
  /* Show children, but not self. */
  gtk_container_foreach (container, (GtkCallback) gtk_widget_show_all, NULL);
}


static void
gtk_menu_hide_all (GtkWidget *widget)
{
  GtkContainer *container;
  
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_MENU (widget));
  container = GTK_CONTAINER (widget);
  
  /* Hide children, but not self. */
  gtk_container_foreach (container, (GtkCallback) gtk_widget_hide_all, NULL);
}