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gimp/app/widgets/gimpmenu.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpmenu.c
* Copyright (C) 2023 Jehan
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "widgets-types.h"
#include "libgimpwidgets/gimpwidgets.h"
#include "core/gimp.h"
#include "gimpaction.h"
#include "gimpenumaction.h"
#include "gimphelp-ids.h"
#include "gimpmenu.h"
#include "gimpmenumodel.h"
#include "gimpmenushell.h"
#include "gimpprocedureaction.h"
#include "gimpradioaction.h"
#include "gimpuimanager.h"
#include "gimpwidgets-utils.h"
#define GIMP_MENU_ACTION_KEY "gimp-menu-action"
/**
* GimpMenu:
*
* Our own menu widget.
*
* We cannot use the simpler gtk_menu_new_from_model() because it lacks
* tooltip support and unfortunately GTK does not plan to implement this:
* https://gitlab.gnome.org/GNOME/gtk/-/issues/785
*
* This is why we need to implement our own GimpMenu subclass. It looks very
* minimal right now, but the whole point is that it is also a GimpMenuShell
* (where all the real work, with proxy items, syncing with actions and such,
* happens).
*/
struct _GimpMenuPrivate
{
GTree *submenus;
GHashTable *sections;
};
static void gimp_menu_iface_init (GimpMenuShellInterface *iface);
static void gimp_menu_finalize (GObject *object);
static void gimp_menu_append (GimpMenuShell *shell,
GimpMenuModel *model);
static void gimp_menu_add_ui (GimpMenuShell *shell,
const gchar **paths,
const gchar *action_name,
gboolean top);
static void gimp_menu_remove_ui (GimpMenuShell *shell,
const gchar **paths,
const gchar *action_name);
static void gimp_menu_model_deleted (GimpMenuShell *shell);
static void gimp_menu_add_action (GimpMenu *menu,
const gchar *action_name,
gboolean long_label,
GtkWidget *sibling,
gboolean top,
GtkRadioMenuItem **group);
static void gimp_menu_remove_action (GimpMenu *menu,
const gchar *action_name);
static void gimp_menu_append_section (GimpMenu *menu,
GimpMenuModel *model,
GtkWidget *start_separator);
static void gimp_menu_section_items_changed (GMenuModel *model,
gint position,
gint removed,
gint added,
GimpMenu *menu);
static void gimp_menu_submenu_notify_title (GimpMenuModel *model,
const GParamSpec *pspec,
GtkMenuItem *item);
static void gimp_menu_submenu_notify_color (GimpMenuModel *model,
const GParamSpec *pspec,
GtkMenuItem *item);
static void gimp_menu_toggle_item_toggled (GtkWidget *item,
GAction *action);
static void gimp_menu_toggle_action_toggled (GimpAction *action,
GtkCheckMenuItem *item);
static void gimp_menu_action_notify_visible (GimpAction *action,
const GParamSpec *pspec,
GtkWidget *item);
static void gimp_menu_help_fun (const gchar *bogus_help_id,
gpointer help_data);
static void gimp_menu_update_visibility (GimpMenu *menu);
G_DEFINE_TYPE_WITH_CODE (GimpMenu, gimp_menu, GTK_TYPE_MENU,
G_ADD_PRIVATE (GimpMenu)
G_IMPLEMENT_INTERFACE (GIMP_TYPE_MENU_SHELL, gimp_menu_iface_init))
#define parent_class gimp_menu_parent_class
/* Class functions */
static void
gimp_menu_class_init (GimpMenuClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->finalize = gimp_menu_finalize;
object_class->get_property = gimp_menu_shell_get_property;
object_class->set_property = gimp_menu_shell_set_property;
gimp_menu_shell_install_properties (object_class);
}
static void
gimp_menu_init (GimpMenu *menu)
{
menu->priv = gimp_menu_get_instance_private (menu);
menu->priv->submenus = g_tree_new_full ((GCompareDataFunc) g_strcmp0, NULL,
g_free, NULL);
menu->priv->sections = g_hash_table_new_full (g_direct_hash, g_direct_equal,
g_object_unref, NULL);
gimp_menu_shell_init (GIMP_MENU_SHELL (menu));
gimp_help_connect (GTK_WIDGET (menu), NULL, gimp_menu_help_fun,
GIMP_HELP_MAIN, menu, NULL);
}
static void
gimp_menu_iface_init (GimpMenuShellInterface *iface)
{
iface->append = gimp_menu_append;
iface->add_ui = gimp_menu_add_ui;
iface->remove_ui = gimp_menu_remove_ui;
iface->model_deleted = gimp_menu_model_deleted;
}
static void
gimp_menu_finalize (GObject *object)
{
GimpMenu *menu = GIMP_MENU (object);
g_clear_pointer (&menu->priv->submenus, g_tree_unref);
g_hash_table_unref (menu->priv->sections);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gimp_menu_append (GimpMenuShell *shell,
GimpMenuModel *model)
{
static GtkRadioMenuItem *group = NULL;
GimpMenu *menu = GIMP_MENU (shell);
GimpUIManager *manager = gimp_menu_shell_get_manager (GIMP_MENU_SHELL (shell));
gint n_items;
g_return_if_fail (GTK_IS_CONTAINER (shell));
n_items = g_menu_model_get_n_items (G_MENU_MODEL (model));
for (gint i = 0; i < n_items; i++)
{
GMenuModel *subsection;
GMenuModel *submenu;
gchar *label = NULL;
gchar *action_name = NULL;
subsection = g_menu_model_get_item_link (G_MENU_MODEL (model), i, G_MENU_LINK_SECTION);
submenu = g_menu_model_get_item_link (G_MENU_MODEL (model), i, G_MENU_LINK_SUBMENU);
g_menu_model_get_item_attribute (G_MENU_MODEL (model), i, G_MENU_ATTRIBUTE_LABEL, "s", &label);
g_menu_model_get_item_attribute (G_MENU_MODEL (model), i, G_MENU_ATTRIBUTE_ACTION, "s", &action_name);
if (subsection != NULL)
{
GtkWidget *item;
group = NULL;
item = gtk_separator_menu_item_new ();
gtk_container_add (GTK_CONTAINER (shell), item);
gtk_widget_show (item);
/* Don't use gimp_menu_shell_append() here because we don't want to
* override the main model for this menu.
* Instead we keep track of each subsection model and their position.
*/
gimp_menu_append_section (menu, GIMP_MENU_MODEL (subsection), item);
item = gtk_separator_menu_item_new ();
gtk_container_add (GTK_CONTAINER (shell), item);
gtk_widget_show (item);
}
else if (submenu != NULL)
{
GtkWidget *subcontainer;
GtkWidget *item;
group = NULL;
/* I don't show the item on purpose because
* gimp_menu_append() will show the parent item if any of
* the added actions are visible.
*/
item = gtk_menu_item_new_with_mnemonic (label);
gtk_container_add (GTK_CONTAINER (shell), item);
subcontainer = gimp_menu_new (manager);
gtk_menu_item_set_submenu (GTK_MENU_ITEM (item), subcontainer);
gimp_menu_shell_append (GIMP_MENU_SHELL (subcontainer), GIMP_MENU_MODEL (submenu));
gtk_widget_show (subcontainer);
g_tree_insert (menu->priv->submenus,
gimp_utils_make_canonical_menu_label (label),
subcontainer);
g_signal_connect (submenu, "notify::title",
G_CALLBACK (gimp_menu_submenu_notify_title),
item);
g_signal_connect (submenu, "notify::color",
G_CALLBACK (gimp_menu_submenu_notify_color),
item);
/* End any radio group of the completed submenu.
* Any subsequent radio menu items start a new radio group.
*/
group = NULL;
}
else
{
gchar *label_variant = NULL;
g_return_if_fail (action_name != NULL);
g_menu_model_get_item_attribute (G_MENU_MODEL (model), i, "label-variant", "s", &label_variant);
gimp_menu_add_action (menu, action_name,
/* By default, we use the short label in menus,
* unless "label-variant" attribute is set to
* "long".
*/
g_strcmp0 (label_variant, "long") == 0,
NULL, FALSE, &group);
g_free (label_variant);
}
g_free (label);
g_free (action_name);
g_clear_object (&submenu);
g_clear_object (&subsection);
}
gimp_menu_update_visibility (menu);
}
static void
gimp_menu_add_ui (GimpMenuShell *shell,
const gchar **paths,
const gchar *action_name,
gboolean top)
{
GimpMenu *menu = GIMP_MENU (shell);
GimpUIManager *manager = gimp_menu_shell_get_manager (GIMP_MENU_SHELL (shell));
GtkWidget *submenu;
g_return_if_fail (paths != NULL && paths[0] != NULL);
submenu = g_tree_lookup (menu->priv->submenus, paths[0]);
if (submenu == NULL)
{
GtkWidget *item;
item = gtk_menu_item_new_with_mnemonic (paths[0]);
gtk_container_add (GTK_CONTAINER (shell), item);
submenu = gimp_menu_new (manager);
gtk_menu_item_set_submenu (GTK_MENU_ITEM (item), submenu);
gtk_widget_show (submenu);
g_tree_insert (menu->priv->submenus, g_strdup (paths[0]), submenu);
}
gimp_menu_add_ui (GIMP_MENU_SHELL (submenu), paths + 1, action_name, top);
gimp_menu_update_visibility (menu);
}
static void
gimp_menu_remove_ui (GimpMenuShell *shell,
const gchar **paths,
const gchar *action_name)
{
GimpMenu *menu = GIMP_MENU (shell);
g_return_if_fail (paths != NULL);
if (paths[0] == NULL)
{
gimp_menu_remove_action (menu, action_name);
}
else
{
GtkWidget *submenu = NULL;
submenu = g_tree_lookup (menu->priv->submenus, paths[0]);
g_return_if_fail (submenu != NULL);
gimp_menu_remove_ui (GIMP_MENU_SHELL (submenu), paths + 1, action_name);
}
gimp_menu_update_visibility (menu);
}
static void
gimp_menu_model_deleted (GimpMenuShell *shell)
{
/* This will unref the sub-models, hence will disconnect the "items-changed"
* signal handlers.
*/
g_hash_table_remove_all (GIMP_MENU (shell)->priv->sections);
}
/* Public functions */
GtkWidget *
gimp_menu_new (GimpUIManager *manager)
{
g_return_val_if_fail (GIMP_IS_UI_MANAGER (manager), NULL);
return g_object_new (GIMP_TYPE_MENU,
"manager", manager,
NULL);
}
void
gimp_menu_merge (GimpMenu *menu,
GimpMenu *menu2,
gboolean top)
{
GList *children;
GList *iter;
children = gtk_container_get_children (GTK_CONTAINER (menu2));
iter = top ? g_list_last (children) : children;
for (; iter; iter = top ? iter->prev : iter->next)
{
GtkWidget *item = iter->data;
g_object_ref (item);
gtk_container_remove (GTK_CONTAINER (menu2), item);
if (top)
gtk_menu_shell_prepend (GTK_MENU_SHELL (menu), item);
else
gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
g_object_unref (item);
}
gtk_widget_destroy (GTK_WIDGET (menu2));
g_list_free (children);
}
/* Private functions */
static void
gimp_menu_add_action (GimpMenu *menu,
const gchar *action_name,
gboolean long_label,
GtkWidget *sibling,
gboolean top,
GtkRadioMenuItem **group)
{
GimpUIManager *manager;
GimpAction *action;
const gchar *action_label;
GtkWidget *item;
gboolean visible;
g_return_if_fail (GIMP_IS_MENU (menu));
manager = gimp_menu_shell_get_manager (GIMP_MENU_SHELL (menu));
action = gimp_ui_manager_find_action (manager, NULL, action_name);
g_return_if_fail (GIMP_IS_ACTION (action));
if (long_label)
action_label = gimp_action_get_label (action);
else
action_label = gimp_action_get_short_label (action);
g_return_if_fail (action_label != NULL);
if (GIMP_IS_TOGGLE_ACTION (action))
{
if (GIMP_IS_RADIO_ACTION (action))
item = gtk_radio_menu_item_new_with_mnemonic_from_widget (group ? *group : NULL,
action_label);
else
item = gtk_check_menu_item_new_with_mnemonic (action_label);
gtk_check_menu_item_set_active (GTK_CHECK_MENU_ITEM (item),
gimp_toggle_action_get_active (GIMP_TOGGLE_ACTION (action)));
if (group)
{
if (GIMP_IS_RADIO_ACTION (action))
*group = GTK_RADIO_MENU_ITEM (item);
else
*group = NULL;
}
g_signal_connect (item, "toggled",
G_CALLBACK (gimp_menu_toggle_item_toggled),
action);
g_signal_connect_object (action, "toggled",
G_CALLBACK (gimp_menu_toggle_action_toggled),
item, 0);
}
else if (GIMP_IS_PROCEDURE_ACTION (action) ||
GIMP_IS_ENUM_ACTION (action))
{
item = gtk_menu_item_new_with_mnemonic (action_label);
if (group)
*group = NULL;
g_signal_connect_swapped (item, "activate",
G_CALLBACK (gimp_action_activate),
action);
}
else
{
item = gtk_menu_item_new_with_mnemonic (action_label);
if (group)
*group = NULL;
g_signal_connect_swapped (item, "activate",
G_CALLBACK (gimp_action_activate),
action);
}
gimp_action_set_proxy (action, item);
g_object_set_data (G_OBJECT (item), GIMP_MENU_ACTION_KEY, action);
if (sibling)
{
GList *children;
gint position = 0;
/* I am assuming that the order of the children list reflects the
* position, though it is not clearly specified in the function docs. Yet
* I could find no other function giving me the position of some child in
* a container.
*/
children = gtk_container_get_children (GTK_CONTAINER (menu));
for (GList *iter = children; iter; iter = iter->next)
{
if (iter->data == sibling)
break;
position++;
}
if (! top)
position++;
gtk_menu_shell_insert (GTK_MENU_SHELL (menu), item, position);
g_list_free (children);
}
else
{
if (top)
gtk_menu_shell_prepend (GTK_MENU_SHELL (menu), item);
else
gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
}
visible = gimp_action_is_visible (action);
gtk_widget_set_visible (item, visible);
if (visible && GTK_IS_MENU (menu))
{
GtkWidget *parent = GTK_WIDGET (menu);
while (parent != NULL && GIMP_IS_MENU (parent))
{
/* Note that this is not the container we must show, but the menu item
* attached to the parent, in order not to leave empty submenus.
*/
GtkWidget *menu_item = gtk_menu_get_attach_widget (GTK_MENU (parent));
if (menu_item == NULL)
break;
if (G_TYPE_FROM_INSTANCE (menu_item) == GTK_TYPE_MENU_ITEM)
gtk_widget_show (menu_item);
parent = gtk_widget_get_parent (menu_item);
}
}
g_signal_connect_object (action, "notify::visible",
G_CALLBACK (gimp_menu_action_notify_visible),
item, 0);
}
static void
gimp_menu_remove_action (GimpMenu *menu,
const gchar *action_name)
{
GimpUIManager *manager;
GList *children;
GimpAction *action;
g_return_if_fail (GIMP_IS_MENU (menu));
manager = gimp_menu_shell_get_manager (GIMP_MENU_SHELL (menu));
action = gimp_ui_manager_find_action (manager, NULL, action_name);
g_return_if_fail (GIMP_IS_ACTION (action));
children = gtk_container_get_children (GTK_CONTAINER (menu));
for (GList *iter = children; iter; iter = iter->next)
{
GtkWidget *child = iter->data;
GimpAction *item_action;
item_action = g_object_get_data (G_OBJECT (child), GIMP_MENU_ACTION_KEY);
if (item_action == action)
{
gtk_widget_destroy (child);
break;
}
}
g_list_free (children);
}
static void
gimp_menu_append_section (GimpMenu *menu,
GimpMenuModel *model,
GtkWidget *start_separator)
{
g_hash_table_insert (menu->priv->sections, g_object_ref (model), start_separator);
gimp_menu_append (GIMP_MENU_SHELL (menu), model);
g_signal_connect_object (model, "items-changed",
G_CALLBACK (gimp_menu_section_items_changed),
menu, 0);
}
static void
gimp_menu_section_items_changed (GMenuModel *model,
gint position,
gint removed,
gint added,
GimpMenu *menu)
{
GList *children;
GList *iter;
GtkWidget *separator;
gboolean found = FALSE;
gint count = position;
gint real_pos = 0;
separator = g_hash_table_lookup (menu->priv->sections, model);
g_return_if_fail (separator != NULL);
children = gtk_container_get_children (GTK_CONTAINER (menu));
for (iter = children; iter; iter = iter->next)
{
real_pos++;
if (! found)
{
if (iter->data == separator)
found = TRUE;
continue;
}
if (count > 0)
{
/* Assume we don't have sections within a section, i.e. in particular
* we don't have more separators, which would mess the count!
*/
count--;
continue;
}
else if (removed > 0)
{
gtk_widget_destroy (iter->data);
removed--;
continue;
}
else
{
break;
}
}
while (added > 0)
{
gchar *action_name = NULL;
gchar *label_variant = NULL;
g_menu_model_get_item_attribute (G_MENU_MODEL (model), position,
G_MENU_ATTRIBUTE_ACTION, "s", &action_name);
g_menu_model_get_item_attribute (G_MENU_MODEL (model), position,
"label-variant", "s", &label_variant);
g_return_if_fail (action_name != NULL);
gimp_menu_add_action (menu, action_name,
g_strcmp0 (label_variant, "long") == 0,
iter ? iter->data : NULL,
iter ? TRUE : FALSE, NULL);
g_free (action_name);
g_free (label_variant);
added--;
position++;
}
g_list_free (children);
gimp_menu_update_visibility (menu);
}
static void
gimp_menu_submenu_notify_title (GimpMenuModel *model,
const GParamSpec *pspec,
GtkMenuItem *item)
{
gchar *title;
g_object_get (model,
"title", &title,
NULL);
gtk_menu_item_set_label (item, title);
g_free (title);
}
static void
gimp_menu_submenu_notify_color (GimpMenuModel *model,
const GParamSpec *pspec,
GtkMenuItem *item)
{
GeglColor *color = NULL;
GtkWidget *image = NULL;
gint width, height;
g_object_get (model,
"color", &color,
NULL);
if (color)
{
image = gimp_color_area_new (color, GIMP_COLOR_AREA_SMALL_CHECKS, 0);
gimp_color_area_set_draw_border (GIMP_COLOR_AREA (image), TRUE);
/* TODO: the color area should be color-managed. */
/*gimp_color_area_set_color_config (GIMP_COLOR_AREA (image),*/
/*gimp->config->color_management);*/
gtk_icon_size_lookup (GTK_ICON_SIZE_MENU, &width, &height);
gtk_widget_set_size_request (image, width, height);
gtk_widget_show (image);
g_object_unref (color);
}
gimp_menu_item_set_image (item, image, NULL);
}
static void
gimp_menu_toggle_item_toggled (GtkWidget *item,
GAction *action)
{
gboolean active = gtk_check_menu_item_get_active (GTK_CHECK_MENU_ITEM (item));
g_signal_handlers_block_by_func (action,
G_CALLBACK (gimp_menu_toggle_action_toggled),
item);
gimp_toggle_action_set_active (GIMP_TOGGLE_ACTION (action), active);
g_signal_handlers_unblock_by_func (action,
G_CALLBACK (gimp_menu_toggle_action_toggled),
item);
}
static void
gimp_menu_toggle_action_toggled (GimpAction *action,
GtkCheckMenuItem *item)
{
gboolean active = gimp_toggle_action_get_active (GIMP_TOGGLE_ACTION (action));
g_signal_handlers_block_by_func (item,
G_CALLBACK (gimp_menu_toggle_item_toggled),
action);
gtk_check_menu_item_set_active (item, active);
g_signal_handlers_unblock_by_func (item,
G_CALLBACK (gimp_menu_toggle_item_toggled),
action);
}
static void
gimp_menu_action_notify_visible (GimpAction *action,
const GParamSpec *pspec,
GtkWidget *item)
{
GtkWidget *container;
gtk_widget_set_visible (item, gimp_action_is_visible (action));
container = gtk_widget_get_parent (item);
if (gimp_action_is_visible (GIMP_ACTION (action)))
{
GtkWidget *widget = gtk_menu_get_attach_widget (GTK_MENU (container));
/* We must show the GtkMenuItem associated as submenu to the parent
* container.
*/
if (G_TYPE_FROM_INSTANCE (widget) == GTK_TYPE_MENU_ITEM)
gtk_widget_show (widget);
}
else
{
GList *children = gtk_container_get_children (GTK_CONTAINER (container));
gboolean all_invisible = TRUE;
for (GList *iter = children; iter; iter = iter->next)
{
if (gtk_widget_get_visible (iter->data))
{
all_invisible = FALSE;
break;
}
}
g_list_free (children);
if (all_invisible)
{
GtkWidget *widget;
/* No need to leave empty submenus. */
widget = gtk_menu_get_attach_widget (GTK_MENU (container));
if (G_TYPE_FROM_INSTANCE (widget) == GTK_TYPE_MENU_ITEM)
gtk_widget_hide (widget);
}
}
gimp_menu_update_visibility (GIMP_MENU (container));
}
static void
gimp_menu_help_fun (const gchar *bogus_help_id,
gpointer help_data)
{
gchar *help_id = NULL;
GimpMenu *menu;
Gimp *gimp;
GtkWidget *item;
gchar *help_domain = NULL;
gchar *help_string = NULL;
gchar *domain_separator;
g_return_if_fail (GIMP_IS_MENU (help_data));
menu = GIMP_MENU (help_data);
gimp = gimp_menu_shell_get_manager (GIMP_MENU_SHELL (menu))->gimp;
g_return_if_fail (GIMP_IS_GIMP (gimp));
item = gtk_menu_shell_get_selected_item (GTK_MENU_SHELL (menu));
if (item)
help_id = g_object_get_qdata (G_OBJECT (item), GIMP_HELP_ID);
if (help_id == NULL || strlen (help_id) == 0)
help_id = (gchar *) bogus_help_id;
help_id = g_strdup (help_id);
domain_separator = strchr (help_id, '?');
if (domain_separator)
{
*domain_separator = '\0';
help_domain = g_strdup (help_id);
help_string = g_strdup (domain_separator + 1);
}
else
{
help_string = g_strdup (help_id);
}
gimp_help (gimp, NULL, help_domain, help_string);
g_free (help_domain);
g_free (help_string);
g_free (help_id);
}
/* With successive sections, we will end up with double separators (end one then
* start one of the next section). Moreover sometimes, empty sections (e.g.
* because items are expected to be added later) would make even 3 to 4
* separators next to each other. This renders very ugly. We need to call this
* function to hide and show separators after changes.
*
* This also hides start and end separators in the menu.
*
* Finally this function shows/hides the whole menu itself, in cases it
* has no visible items. There is no need to show an empty submenu.
*/
static void
gimp_menu_update_visibility (GimpMenu *menu)
{
GList *children;
GList *iter;
GtkWidget *prev_item = NULL;
GtkWidget *menu_item = gtk_menu_get_attach_widget (GTK_MENU (menu));
gint n_items = 0;
children = gtk_container_get_children (GTK_CONTAINER (menu));
for (iter = children; iter; iter = iter->next)
{
GtkWidget *item = iter->data;
if (GTK_IS_SEPARATOR_MENU_ITEM (item))
{
if (prev_item == NULL ||
GTK_IS_SEPARATOR_MENU_ITEM (prev_item))
{
gtk_widget_hide (item);
}
else
{
gtk_widget_show (item);
prev_item = item;
}
}
else if (gtk_widget_get_visible (item))
{
/* Right now, all but separators are meaningful items.
* XXX: though I should likely also check submenus. If a menu
* contains another empty submenu, we should likely hide the
* whole hierarchy.
*/
n_items++;
prev_item = item;
}
}
if (prev_item != NULL && GTK_IS_SEPARATOR_MENU_ITEM (prev_item))
gtk_widget_hide (prev_item);
g_list_free (children);
gtk_widget_set_visible (GTK_WIDGET (menu_item), n_items > 0);
}
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