gtkmenushell.c

gtk是linux一款强大的夸平台的图形化开发工具

	      gtk_widget_event (menu_shell->parent_menu_shell, (GdkEvent*) event);
	      return TRUE;
	    }
	}
      else
	deactivate = FALSE;
      
      /* If the button click was very fast, or we ended up on a submenu,
       * leave the menu up
       */
      if (!deactivate || 
	  (menu_item && (menu_shell->active_menu_item == menu_item)))
	{
	  deactivate = FALSE;
	  menu_shell->ignore_leave = TRUE;
	}
      else
	deactivate = TRUE;

      if (deactivate)
	{
	  gtk_menu_shell_deactivate (menu_shell);
	  gtk_signal_emit (GTK_OBJECT (menu_shell), menu_shell_signals[SELECTION_DONE]);
	}
    }

  return TRUE;
}

static gint
gtk_menu_shell_key_press (GtkWidget	*widget,
			  GdkEventKey *event)
{
  GtkMenuShell *menu_shell;
  
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_MENU_SHELL (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);
      
  menu_shell = GTK_MENU_SHELL (widget);

  if (!menu_shell->active_menu_item && menu_shell->parent_menu_shell)
    return gtk_widget_event (menu_shell->parent_menu_shell, (GdkEvent *)event);
  
  if (gtk_bindings_activate (GTK_OBJECT (widget),
			     event->keyval,
			     event->state))
    return TRUE;

  if (gtk_accel_groups_activate (GTK_OBJECT (widget), event->keyval, event->state))
    return TRUE;

  return FALSE;
}

static gint
gtk_menu_shell_enter_notify (GtkWidget        *widget,
			     GdkEventCrossing *event)
{
  GtkMenuShell *menu_shell;
  GtkWidget *menu_item;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_MENU_SHELL (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  menu_shell = GTK_MENU_SHELL (widget);

  if (menu_shell->active && !menu_shell->ignore_enter)
    {
      menu_item = gtk_get_event_widget ((GdkEvent*) event);

      if (!menu_item || !GTK_WIDGET_IS_SENSITIVE (menu_item))
	return TRUE;

      if ((menu_item->parent == widget) &&
	  (menu_shell->active_menu_item != menu_item) &&
	  GTK_IS_MENU_ITEM (menu_item))
	{
	  if ((event->detail != GDK_NOTIFY_INFERIOR) &&
	      (GTK_WIDGET_STATE (menu_item) != GTK_STATE_PRELIGHT))
	    {
	      gtk_menu_shell_select_item (menu_shell, menu_item);
	    }
	}
      else if (menu_shell->parent_menu_shell)
	{
	  gtk_widget_event (menu_shell->parent_menu_shell, (GdkEvent*) event);
	}
    }

  return TRUE;
}

static gint
gtk_menu_shell_leave_notify (GtkWidget        *widget,
			     GdkEventCrossing *event)
{
  GtkMenuShell *menu_shell;
  GtkMenuItem *menu_item;
  GtkWidget *event_widget;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_MENU_SHELL (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  if (GTK_WIDGET_VISIBLE (widget))
    {
      menu_shell = GTK_MENU_SHELL (widget);
      event_widget = gtk_get_event_widget ((GdkEvent*) event);

      if (!event_widget || !GTK_IS_MENU_ITEM (event_widget))
	return TRUE;

      menu_item = GTK_MENU_ITEM (event_widget);

      if (menu_shell->ignore_leave)
	{
	  menu_shell->ignore_leave = FALSE;
	  return TRUE;
	}

      if (!GTK_WIDGET_IS_SENSITIVE (menu_item))
	return TRUE;

      if ((menu_shell->active_menu_item == event_widget) &&
	  (menu_item->submenu == NULL))
	{
	  if ((event->detail != GDK_NOTIFY_INFERIOR) &&
	      (GTK_WIDGET_STATE (menu_item) != GTK_STATE_NORMAL))
	    {
	      gtk_menu_shell_deselect (menu_shell);
	    }
	}
      else if (menu_shell->parent_menu_shell)
	{
	  gtk_widget_event (menu_shell->parent_menu_shell, (GdkEvent*) event);
	}
    }

  return TRUE;
}

static void
gtk_menu_shell_add (GtkContainer *container,
		    GtkWidget    *widget)
{
  gtk_menu_shell_append (GTK_MENU_SHELL (container), widget);
}

static void
gtk_menu_shell_remove (GtkContainer *container,
		       GtkWidget    *widget)
{
  GtkMenuShell *menu_shell;
  gint was_visible;
  
  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_MENU_SHELL (container));
  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_MENU_ITEM (widget));
  
  was_visible = GTK_WIDGET_VISIBLE (widget);
  menu_shell = GTK_MENU_SHELL (container);
  menu_shell->children = g_list_remove (menu_shell->children, widget);
  
  gtk_widget_unparent (widget);
  
  /* queue resize regardless of GTK_WIDGET_VISIBLE (container),
   * since that's what is needed by toplevels.
   */
  if (was_visible)
    gtk_widget_queue_resize (GTK_WIDGET (container));
}

static void
gtk_menu_shell_forall (GtkContainer *container,
		       gboolean      include_internals,
		       GtkCallback   callback,
		       gpointer      callback_data)
{
  GtkMenuShell *menu_shell;
  GtkWidget *child;
  GList *children;

  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_MENU_SHELL (container));
  g_return_if_fail (callback != NULL);

  menu_shell = GTK_MENU_SHELL (container);

  children = menu_shell->children;
  while (children)
    {
      child = children->data;
      children = children->next;

      (* callback) (child, callback_data);
    }
}


static void
gtk_real_menu_shell_deactivate (GtkMenuShell *menu_shell)
{
  g_return_if_fail (menu_shell != NULL);
  g_return_if_fail (GTK_IS_MENU_SHELL (menu_shell));

  if (menu_shell->active)
    {
      menu_shell->button = 0;
      menu_shell->active = FALSE;

      if (menu_shell->active_menu_item)
	{
	  gtk_menu_item_deselect (GTK_MENU_ITEM (menu_shell->active_menu_item));
	  menu_shell->active_menu_item = NULL;
	}

      if (menu_shell->have_grab)
	{
	  menu_shell->have_grab = FALSE;
	  gtk_grab_remove (GTK_WIDGET (menu_shell));
	}
      if (menu_shell->have_xgrab)
	{
	  menu_shell->have_xgrab = FALSE;
	  gdk_pointer_ungrab (GDK_CURRENT_TIME);
	  gdk_keyboard_ungrab (GDK_CURRENT_TIME);
	}
    }
}

static gint
gtk_menu_shell_is_item (GtkMenuShell *menu_shell,
			GtkWidget    *child)
{
  GtkWidget *parent;

  g_return_val_if_fail (menu_shell != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_MENU_SHELL (menu_shell), FALSE);
  g_return_val_if_fail (child != NULL, FALSE);

  parent = child->parent;
  while (parent && GTK_IS_MENU_SHELL (parent))
    {
      if (parent == (GtkWidget*) menu_shell)
	return TRUE;
      parent = GTK_MENU_SHELL (parent)->parent_menu_shell;
    }

  return FALSE;
}

static GtkWidget*
gtk_menu_shell_get_item (GtkMenuShell *menu_shell,
			 GdkEvent     *event)
{
  GtkWidget *menu_item;

  menu_item = gtk_get_event_widget ((GdkEvent*) event);
  
  while (menu_item && !GTK_IS_MENU_ITEM (menu_item))
    menu_item = menu_item->parent;

  if (menu_item && gtk_menu_shell_is_item (menu_shell, menu_item))
    return menu_item;
  else
    return NULL;
}

/* Handlers for action signals */

void
gtk_menu_shell_select_item (GtkMenuShell *menu_shell,
			    GtkWidget    *menu_item)
{
  g_return_if_fail (menu_shell != NULL);
  g_return_if_fail (GTK_IS_MENU_SHELL (menu_shell));
  g_return_if_fail (menu_item != NULL);
  g_return_if_fail (GTK_IS_MENU_ITEM (menu_item));

  gtk_menu_shell_deselect (menu_shell);
  
  menu_shell->active_menu_item = menu_item;
  gtk_menu_item_set_placement (GTK_MENU_ITEM (menu_shell->active_menu_item),
			       MENU_SHELL_CLASS (menu_shell)->submenu_placement);
  gtk_menu_item_select (GTK_MENU_ITEM (menu_shell->active_menu_item));

  /* This allows the bizarre radio buttons-with-submenus-display-history
   * behavior
   */
  if (GTK_MENU_ITEM (menu_shell->active_menu_item)->submenu)
    gtk_widget_activate (menu_shell->active_menu_item);
}

void
gtk_menu_shell_deselect (GtkMenuShell *menu_shell)
{
  g_return_if_fail (GTK_IS_MENU_SHELL (menu_shell));

  if (menu_shell->active_menu_item)
    {
      gtk_menu_item_deselect (GTK_MENU_ITEM (menu_shell->active_menu_item));
      menu_shell->active_menu_item = NULL;
    }
}

void
gtk_menu_shell_activate_item (GtkMenuShell      *menu_shell,
			      GtkWidget         *menu_item,
			      gboolean           force_deactivate)
{
  GSList *slist, *shells = NULL;
  gboolean deactivate = force_deactivate;

  g_return_if_fail (menu_shell != NULL);
  g_return_if_fail (GTK_IS_MENU_SHELL (menu_shell));
  g_return_if_fail (menu_item != NULL);
  g_return_if_fail (GTK_IS_MENU_ITEM (menu_item));

  if (!deactivate)
    deactivate = GTK_MENU_ITEM_CLASS (GTK_OBJECT (menu_item)->klass)->hide_on_activate;

  gtk_widget_ref (GTK_WIDGET (menu_shell));

  if (deactivate)
    {
      GtkMenuShell *parent_menu_shell = menu_shell;

      do
	{
	  gtk_widget_ref (GTK_WIDGET (parent_menu_shell));
	  shells = g_slist_prepend (shells, parent_menu_shell);
	  parent_menu_shell = (GtkMenuShell*) parent_menu_shell->parent_menu_shell;
	}
      while (parent_menu_shell);
      shells = g_slist_reverse (shells);

      gtk_menu_shell_deactivate (menu_shell);
  
      /* flush the x-queue, so any grabs are removed and
       * the menu is actually taken down
       */
      gdk_flush ();
    }

  gtk_widget_activate (menu_item);

  for (slist = shells; slist; slist = slist->next)
    {
      gtk_signal_emit (slist->data, menu_shell_signals[SELECTION_DONE]);
      gtk_widget_unref (slist->data);
    }
  g_slist_free (shells);

  gtk_widget_unref (GTK_WIDGET (menu_shell));
}

/* Distance should be +/- 1 */
static void
gtk_menu_shell_move_selected (GtkMenuShell  *menu_shell, 
			      gint           distance)
{
  if (menu_shell->active_menu_item)
    {
      GList *node = g_list_find (menu_shell->children,
				 menu_shell->active_menu_item);
      GList *start_node = node;
      
      if (distance > 0)
	{
	  node = node->next;
	  while (node != start_node && 
		 (!node ||
		  !GTK_WIDGET_IS_SENSITIVE (node->data) ||
		  !GTK_WIDGET_VISIBLE (node->data) ))
	    {
	      if (!node)
		node = menu_shell->children;
	      else
		node = node->next;
	    }
	}
      else
	{
	  node = node->prev;
	  while (node != start_node &&
		 (!node ||
		  !GTK_WIDGET_IS_SENSITIVE (node->data) ||
		  !GTK_WIDGET_VISIBLE (node->data) ))
	    {
	      if (!node)
		node = g_list_last (menu_shell->children);
	      else
		node = node->prev;
	    }
	}
      
      if (node)
	gtk_menu_shell_select_item (menu_shell, node->data);
    }
}

static void
gtk_real_menu_shell_move_current (GtkMenuShell      *menu_shell,
				  GtkMenuDirectionType direction)
{
  GtkMenuShell *parent_menu_shell = NULL;
  gboolean had_selection;

  had_selection = menu_shell->active_menu_item != NULL;

  if (menu_shell->parent_menu_shell)
    parent_menu_shell = GTK_MENU_SHELL (menu_shell->parent_menu_shell);
  
  switch (direction)
    {
    case GTK_MENU_DIR_PARENT:
      if (parent_menu_shell)
	{
	  if (GTK_MENU_SHELL_CLASS (GTK_OBJECT (parent_menu_shell)->klass)->submenu_placement == 
		       GTK_MENU_SHELL_CLASS (GTK_OBJECT (menu_shell)->klass)->submenu_placement)
	    gtk_menu_shell_deselect (menu_shell);
	  else
	    gtk_menu_shell_move_selected (parent_menu_shell, -1);
	}
      break;
      
    case GTK_MENU_DIR_CHILD:
      if (menu_shell->active_menu_item &&
	  GTK_BIN (menu_shell->active_menu_item)->child &&
	  GTK_MENU_ITEM (menu_shell->active_menu_item)->submenu)
	{
	  menu_shell = GTK_MENU_SHELL (GTK_MENU_ITEM (menu_shell->active_menu_item)->submenu);
	  if (menu_shell->children)
	    gtk_menu_shell_select_item (menu_shell, menu_shell->children->data);
	}
      else
	{
	  /* Try to find a menu running the opposite direction */
	  while (parent_menu_shell && 
		 (GTK_MENU_SHELL_CLASS (GTK_OBJECT (parent_menu_shell)->klass)->submenu_placement ==
		  GTK_MENU_SHELL_CLASS (GTK_OBJECT (menu_shell)->klass)->submenu_placement))
	    parent_menu_shell = GTK_MENU_SHELL (parent_menu_shell->parent_menu_shell);
	  
	  if (parent_menu_shell)
	    gtk_menu_shell_move_selected (parent_menu_shell, 1);
	}
      break;
      
    case GTK_MENU_DIR_PREV:
      gtk_menu_shell_move_selected (menu_shell, -1);
      if (!had_selection &&
	  !menu_shell->active_menu_item &&
	  menu_shell->children)
	gtk_menu_shell_select_item (menu_shell, g_list_last (menu_shell->children)->data);
      break;
    case GTK_MENU_DIR_NEXT:
      gtk_menu_shell_move_selected (menu_shell, 1);
      if (!had_selection &&
	  !menu_shell->active_menu_item &&
	  menu_shell->children)
	gtk_menu_shell_select_item (menu_shell, menu_shell->children->data);
      break;
    }
  
}

static void
gtk_real_menu_shell_activate_current (GtkMenuShell      *menu_shell,
				      gboolean           force_hide)
{
  if (menu_shell->active_menu_item &&
      GTK_WIDGET_IS_SENSITIVE (menu_shell->active_menu_item) &&
      GTK_MENU_ITEM (menu_shell->active_menu_item)->submenu == NULL)
    {
      gtk_menu_shell_activate_item (menu_shell,
				    menu_shell->active_menu_item,
				    force_hide);
    }
}

static void
gtk_real_menu_shell_cancel (GtkMenuShell      *menu_shell)
{
  gtk_menu_shell_deactivate (menu_shell);
  gtk_signal_emit (GTK_OBJECT (menu_shell), menu_shell_signals[SELECTION_DONE]);
}