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/*
* GTK - The GIMP Toolkit
* Copyright (C) 1998, 1999 Red Hat, Inc.
* All rights reserved.
*
* 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 the Gnome Library; see the file COPYING.LIB. If not,
* write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/

/*
* Author: James Henstridge <james@daa.com.au>
*
* Modified by the GTK+ Team and others 2003. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/

/**
* SECTION:gtkaction
* @Short_description: An action which can be triggered by a menu or toolbar item
* @Title: GtkAction
* @See_also: #GtkActionGroup, #GtkUIManager, #GtkActivatable
*
* Actions represent operations that the user can be perform, along with
* some information how it should be presented in the interface. Each action
* provides methods to create icons, menu items and toolbar items
* representing itself.
*
* As well as the callback that is called when the action gets activated,
* the following also gets associated with the action:
* <itemizedlist>
* <listitem><para>a name (not translated, for path lookup)</para></listitem>
* <listitem><para>a label (translated, for display)</para></listitem>
* <listitem><para>an accelerator</para></listitem>
* <listitem><para>whether label indicates a stock id</para></listitem>
* <listitem><para>a tooltip (optional, translated)</para></listitem>
* <listitem><para>a toolbar label (optional, shorter than label)</para></listitem>
* </itemizedlist>
* The action will also have some state information:
* <itemizedlist>
* <listitem><para>visible (shown/hidden)</para></listitem>
* <listitem><para>sensitive (enabled/disabled)</para></listitem>
* </itemizedlist>
* Apart from regular actions, there are <link linkend="GtkToggleAction">toggle
* actions</link>, which can be toggled between two states and <link
* linkend="GtkRadioAction">radio actions</link>, of which only one in a group
* can be in the "active" state. Other actions can be implemented as #GtkAction
* subclasses.
*
* Each action can have one or more proxy widgets. To act as an action proxy,
* widget needs to implement #GtkActivatable interface. Proxies mirror the state
* of the action and should change when the action's state changes. Properties
* that are always mirrored by proxies are #GtkAction:sensitive and
* #GtkAction:visible. #GtkAction:gicon, #GtkAction:icon-name, #GtkAction:label,
* #GtkAction:short-label and #GtkAction:stock-id properties are only mirorred
* if proxy widget has #GtkActivatable:use-action-appearance property set to
* %TRUE.
*
* When the proxy is activated, it should activate its action.
*/

#include "config.h"

#include "gtkaction.h"
#include "gtkactiongroup.h"
#include "gtkaccellabel.h"
#include "gtkbutton.h"
#include "gtkiconfactory.h"
#include "gtkimage.h"
#include "gtkimagemenuitem.h"
#include "gtkintl.h"
#include "gtklabel.h"
#include "gtkmarshalers.h"
#include "gtkmenuitem.h"
#include "gtkstock.h"
#include "gtktearoffmenuitem.h"
#include "gtktoolbutton.h"
#include "gtktoolbar.h"
#include "gtkprivate.h"
#include "gtkbuildable.h"
#include "gtkactivatable.h"


struct _GtkActionPrivate
{
  const gchar *name; /* interned */
  gchar *label;
  gchar *short_label;
  gchar *tooltip;
  gchar *stock_id; /* stock icon */
  gchar *icon_name; /* themed icon */
  GIcon *gicon;

  guint sensitive : 1;
  guint visible : 1;
  guint label_set : 1; /* these two used so we can set label */
  guint short_label_set : 1; /* based on stock id */
  guint visible_horizontal : 1;
  guint visible_vertical : 1;
  guint is_important : 1;
  guint hide_if_empty : 1;
  guint visible_overflown : 1;
  guint always_show_image : 1;
  guint recursion_guard : 1;
  guint activate_blocked : 1;

  /* accelerator */
  guint accel_count;
  GtkAccelGroup *accel_group;
  GClosure *accel_closure;
  GQuark accel_quark;

  GtkActionGroup *action_group;

  /* list of proxy widgets */
  GSList *proxies;
};

enum
{
  ACTIVATE,
  LAST_SIGNAL
};

enum
{
  PROP_0,
  PROP_NAME,
  PROP_LABEL,
  PROP_SHORT_LABEL,
  PROP_TOOLTIP,
  PROP_STOCK_ID,
  PROP_ICON_NAME,
  PROP_GICON,
  PROP_VISIBLE_HORIZONTAL,
  PROP_VISIBLE_VERTICAL,
  PROP_VISIBLE_OVERFLOWN,
  PROP_IS_IMPORTANT,
  PROP_HIDE_IF_EMPTY,
  PROP_SENSITIVE,
  PROP_VISIBLE,
  PROP_ACTION_GROUP,
  PROP_ALWAYS_SHOW_IMAGE
};

/* GtkBuildable */
static void gtk_action_buildable_init (GtkBuildableIface *iface);
static void gtk_action_buildable_set_name (GtkBuildable *buildable,
const gchar *name);
static const gchar* gtk_action_buildable_get_name (GtkBuildable *buildable);

G_DEFINE_TYPE_WITH_CODE (GtkAction, gtk_action, G_TYPE_OBJECT,
G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE,
gtk_action_buildable_init))

static void gtk_action_finalize (GObject *object);
static void gtk_action_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_action_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void gtk_action_set_action_group (GtkAction *action,
GtkActionGroup *action_group);

static GtkWidget *create_menu_item (GtkAction *action);
static GtkWidget *create_tool_item (GtkAction *action);
static void connect_proxy (GtkAction *action,
GtkWidget *proxy);
static void disconnect_proxy (GtkAction *action,
GtkWidget *proxy);
 
static void closure_accel_activate (GClosure *closure,
GValue *return_value,
guint n_param_values,
const GValue *param_values,
gpointer invocation_hint,
gpointer marshal_data);

static guint action_signals[LAST_SIGNAL] = { 0 };


static void
gtk_action_class_init (GtkActionClass *klass)
{
  GObjectClass *gobject_class;

  gobject_class = G_OBJECT_CLASS (klass);

  gobject_class->finalize = gtk_action_finalize;
  gobject_class->set_property = gtk_action_set_property;
  gobject_class->get_property = gtk_action_get_property;

  klass->activate = NULL;

  klass->create_menu_item = create_menu_item;
  klass->create_tool_item = create_tool_item;
  klass->create_menu = NULL;
  klass->menu_item_type = GTK_TYPE_IMAGE_MENU_ITEM;
  klass->toolbar_item_type = GTK_TYPE_TOOL_BUTTON;
  klass->connect_proxy = connect_proxy;
  klass->disconnect_proxy = disconnect_proxy;

  g_object_class_install_property (gobject_class,
PROP_NAME,
g_param_spec_string ("name",
P_("Name"),
P_("A unique name for the action."),
NULL,
GTK_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY));

  /**
* GtkAction:label:
*
* The label used for menu items and buttons that activate
* this action. If the label is %NULL, GTK+ uses the stock
* label specified via the stock-id property.
*
* This is an appearance property and thus only applies if
* #GtkActivatable:use-action-appearance is %TRUE.
*/
  g_object_class_install_property (gobject_class,
PROP_LABEL,
g_param_spec_string ("label",
P_("Label"),
P_("The label used for menu items and buttons "
"that activate this action."),
NULL,
GTK_PARAM_READWRITE));

  /**
* GtkAction:short-label:
*
* A shorter label that may be used on toolbar buttons.
*
* This is an appearance property and thus only applies if
* #GtkActivatable:use-action-appearance is %TRUE.
*/
  g_object_class_install_property (gobject_class,
PROP_SHORT_LABEL,
g_param_spec_string ("short-label",
P_("Short label"),
P_("A shorter label that may be used on toolbar buttons."),
NULL,
GTK_PARAM_READWRITE));


  g_object_class_install_property (gobject_class,
PROP_TOOLTIP,
g_param_spec_string ("tooltip",
P_("Tooltip"),
P_("A tooltip for this action."),
NULL,
GTK_PARAM_READWRITE));

  /**
* GtkAction:stock-id:
*
* The stock icon displayed in widgets representing this action.
*
* This is an appearance property and thus only applies if
* #GtkActivatable:use-action-appearance is %TRUE.
*/
  g_object_class_install_property (gobject_class,
PROP_STOCK_ID,
g_param_spec_string ("stock-id",
P_("Stock Icon"),
P_("The stock icon displayed in widgets representing "
"this action."),
NULL,
GTK_PARAM_READWRITE));
  /**
* GtkAction:gicon:
*
* The #GIcon displayed in the #GtkAction.
*
* Note that the stock icon is preferred, if the #GtkAction:stock-id
* property holds the id of an existing stock icon.
*
* This is an appearance property and thus only applies if
* #GtkActivatable:use-action-appearance is %TRUE.
*
* Since: 2.16
*/
  g_object_class_install_property (gobject_class,
PROP_GICON,
g_param_spec_object ("gicon",
P_("GIcon"),
P_("The GIcon being displayed"),
G_TYPE_ICON,
  GTK_PARAM_READWRITE));
  /**
* GtkAction:icon-name:
*
* The name of the icon from the icon theme.
*
* Note that the stock icon is preferred, if the #GtkAction:stock-id
* property holds the id of an existing stock icon, and the #GIcon is
* preferred if the #GtkAction:gicon property is set.
*
* This is an appearance property and thus only applies if
* #GtkActivatable:use-action-appearance is %TRUE.
*
* Since: 2.10
*/
  g_object_class_install_property (gobject_class,
PROP_ICON_NAME,
g_param_spec_string ("icon-name",
P_("Icon Name"),
P_("The name of the icon from the icon theme"),
NULL,
  GTK_PARAM_READWRITE));

  g_object_class_install_property (gobject_class,
PROP_VISIBLE_HORIZONTAL,
g_param_spec_boolean ("visible-horizontal",
P_("Visible when horizontal"),
P_("Whether the toolbar item is visible when the toolbar "
"is in a horizontal orientation."),
TRUE,
GTK_PARAM_READWRITE));
  /**
* GtkAction:visible-overflown:
*
* When %TRUE, toolitem proxies for this action are represented in the
* toolbar overflow menu.
*
* Since: 2.6
*/
  g_object_class_install_property (gobject_class,
PROP_VISIBLE_OVERFLOWN,
g_param_spec_boolean ("visible-overflown",
P_("Visible when overflown"),
P_("When TRUE, toolitem proxies for this action "
"are represented in the toolbar overflow menu."),
TRUE,
GTK_PARAM_READWRITE));
  g_object_class_install_property (gobject_class,
PROP_VISIBLE_VERTICAL,
g_param_spec_boolean ("visible-vertical",
P_("Visible when vertical"),
P_("Whether the toolbar item is visible when the toolbar "
"is in a vertical orientation."),
TRUE,
GTK_PARAM_READWRITE));
  g_object_class_install_property (gobject_class,
PROP_IS_IMPORTANT,
g_param_spec_boolean ("is-important",
P_("Is important"),
P_("Whether the action is considered important. "
"When TRUE, toolitem proxies for this action "
"show text in GTK_TOOLBAR_BOTH_HORIZ mode."),
FALSE,
GTK_PARAM_READWRITE));
  g_object_class_install_property (gobject_class,
PROP_HIDE_IF_EMPTY,
g_param_spec_boolean ("hide-if-empty",
P_("Hide if empty"),
P_("When TRUE, empty menu proxies for this action are hidden."),
TRUE,
GTK_PARAM_READWRITE));
  g_object_class_install_property (gobject_class,
PROP_SENSITIVE,
g_param_spec_boolean ("sensitive",
P_("Sensitive"),
P_("Whether the action is enabled."),
TRUE,
GTK_PARAM_READWRITE));
  g_object_class_install_property (gobject_class,
PROP_VISIBLE,
g_param_spec_boolean ("visible",
P_("Visible"),
P_("Whether the action is visible."),
TRUE,
GTK_PARAM_READWRITE));
  g_object_class_install_property (gobject_class,
PROP_ACTION_GROUP,
g_param_spec_object ("action-group",
P_("Action Group"),
P_("The GtkActionGroup this GtkAction is associated with, or NULL (for internal use)."),
GTK_TYPE_ACTION_GROUP,
GTK_PARAM_READWRITE));

  /**
* GtkAction:always-show-image:
*
* If %TRUE, the action's menu item proxies will ignore the #GtkSettings:gtk-menu-images
* setting and always show their image, if available.
*
* Use this property if the menu item would be useless or hard to use
* without their image.
*
* Since: 2.20
**/
  g_object_class_install_property (gobject_class,
                                   PROP_ALWAYS_SHOW_IMAGE,
                                   g_param_spec_boolean ("always-show-image",
                                                         P_("Always show image"),
                                                         P_("Whether the image will always be shown"),
                                                         FALSE,
                                                         GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT));

  /**
* GtkAction::activate:
* @action: the #GtkAction
*
* The "activate" signal is emitted when the action is activated.
*
* Since: 2.4
*/
  action_signals[ACTIVATE] =
    g_signal_new (I_("activate"),
G_OBJECT_CLASS_TYPE (klass),
G_SIGNAL_RUN_FIRST | G_SIGNAL_NO_RECURSE,
G_STRUCT_OFFSET (GtkActionClass, activate), NULL, NULL,
g_cclosure_marshal_VOID__VOID,
G_TYPE_NONE, 0);

  g_type_class_add_private (gobject_class, sizeof (GtkActionPrivate));
}


static void
gtk_action_init (GtkAction *action)
{
  action->private_data = G_TYPE_INSTANCE_GET_PRIVATE (action,
                                                      GTK_TYPE_ACTION,
                                                      GtkActionPrivate);

  action->private_data->name = NULL;
  action->private_data->label = NULL;
  action->private_data->short_label = NULL;
  action->private_data->tooltip = NULL;
  action->private_data->stock_id = NULL;
  action->private_data->icon_name = NULL;
  action->private_data->visible_horizontal = TRUE;
  action->private_data->visible_vertical = TRUE;
  action->private_data->visible_overflown = TRUE;
  action->private_data->is_important = FALSE;
  action->private_data->hide_if_empty = TRUE;
  action->private_data->always_show_image = FALSE;
  action->private_data->activate_blocked = FALSE;

  action->private_data->sensitive = TRUE;
  action->private_data->visible = TRUE;

  action->private_data->label_set = FALSE;
  action->private_data->short_label_set = FALSE;

  action->private_data->accel_count = 0;
  action->private_data->accel_group = NULL;
  action->private_data->accel_quark = 0;
  action->private_data->accel_closure =
    g_closure_new_object (sizeof (GClosure), G_OBJECT (action));
  g_closure_set_marshal (action->private_data->accel_closure,
closure_accel_activate);
  g_closure_ref (action->private_data->accel_closure);
  g_closure_sink (action->private_data->accel_closure);

  action->private_data->action_group = NULL;

  action->private_data->proxies = NULL;
  action->private_data->gicon = NULL;
}

static void
gtk_action_buildable_init (GtkBuildableIface *iface)
{
  iface->set_name = gtk_action_buildable_set_name;
  iface->get_name = gtk_action_buildable_get_name;
}

static void
gtk_action_buildable_set_name (GtkBuildable *buildable,
const gchar *name)
{
  GtkAction *action = GTK_ACTION (buildable);

  action->private_data->name = g_intern_string (name);
}

static const gchar *
gtk_action_buildable_get_name (GtkBuildable *buildable)
{
  GtkAction *action = GTK_ACTION (buildable);

  return action->private_data->name;
}

/**
* gtk_action_new:
* @name: A unique name for the action
* @label: (allow-none): the label displayed in menu items and on buttons,
* or %NULL
* @tooltip: (allow-none): a tooltip for the action, or %NULL
* @stock_id: (allow-none): the stock icon to display in widgets representing
* the action, or %NULL
*
* Creates a new #GtkAction object. To add the action to a
* #GtkActionGroup and set the accelerator for the action,
* call gtk_action_group_add_action_with_accel().
* See <xref linkend="XML-UI"/> for information on allowed action
* names.
*
* Return value: a new #GtkAction
*
* Since: 2.4
*/
GtkAction *
gtk_action_new (const gchar *name,
const gchar *label,
const gchar *tooltip,
const gchar *stock_id)
{
  g_return_val_if_fail (name != NULL, NULL);

  return g_object_new (GTK_TYPE_ACTION,
                       "name", name,
"label", label,
"tooltip", tooltip,
"stock-id", stock_id,
NULL);
}

static void
gtk_action_finalize (GObject *object)
{
  GtkAction *action;
  action = GTK_ACTION (object);

  g_free (action->private_data->label);
  g_free (action->private_data->short_label);
  g_free (action->private_data->tooltip);
  g_free (action->private_data->stock_id);
  g_free (action->private_data->icon_name);
  
  if (action->private_data->gicon)
    g_object_unref (action->private_data->gicon);

  g_closure_unref (action->private_data->accel_closure);
  if (action->private_data->accel_group)
    g_object_unref (action->private_data->accel_group);

  G_OBJECT_CLASS (gtk_action_parent_class)->finalize (object);
}

static void
gtk_action_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
  GtkAction *action;
  
  action = GTK_ACTION (object);

  switch (prop_id)
    {
    case PROP_NAME:
      action->private_data->name = g_intern_string (g_value_get_string (value));
      break;
    case PROP_LABEL:
      gtk_action_set_label (action, g_value_get_string (value));
      break;
    case PROP_SHORT_LABEL:
      gtk_action_set_short_label (action, g_value_get_string (value));
      break;
    case PROP_TOOLTIP:
      gtk_action_set_tooltip (action, g_value_get_string (value));
      break;
    case PROP_STOCK_ID:
      gtk_action_set_stock_id (action, g_value_get_string (value));
      break;
    case PROP_GICON:
      gtk_action_set_gicon (action, g_value_get_object (value));
      break;
    case PROP_ICON_NAME:
      gtk_action_set_icon_name (action, g_value_get_string (value));
      break;
    case PROP_VISIBLE_HORIZONTAL:
      gtk_action_set_visible_horizontal (action, g_value_get_boolean (value));
      break;
    case PROP_VISIBLE_VERTICAL:
      gtk_action_set_visible_vertical (action, g_value_get_boolean (value));
      break;
    case PROP_VISIBLE_OVERFLOWN:
      action->private_data->visible_overflown = g_value_get_boolean (value);
      break;
    case PROP_IS_IMPORTANT:
      gtk_action_set_is_important (action, g_value_get_boolean (value));
      break;
    case PROP_HIDE_IF_EMPTY:
      action->private_data->hide_if_empty = g_value_get_boolean (value);
      break;
    case PROP_SENSITIVE:
      gtk_action_set_sensitive (action, g_value_get_boolean (value));
      break;
    case PROP_VISIBLE:
      gtk_action_set_visible (action, g_value_get_boolean (value));
      break;
    case PROP_ACTION_GROUP:
      gtk_action_set_action_group (action, g_value_get_object (value));
      break;
    case PROP_ALWAYS_SHOW_IMAGE:
      gtk_action_set_always_show_image (action, g_value_get_boolean (value));
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
gtk_action_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
  GtkAction *action;

  action = GTK_ACTION (object);

  switch (prop_id)
    {
    case PROP_NAME:
      g_value_set_static_string (value, action->private_data->name);
      break;
    case PROP_LABEL:
      g_value_set_string (value, action->private_data->label);
      break;
    case PROP_SHORT_LABEL:
      g_value_set_string (value, action->private_data->short_label);
      break;
    case PROP_TOOLTIP:
      g_value_set_string (value, action->private_data->tooltip);
      break;
    case PROP_STOCK_ID:
      g_value_set_string (value, action->private_data->stock_id);
      break;
    case PROP_ICON_NAME:
      g_value_set_string (value, action->private_data->icon_name);
      break;
    case PROP_GICON:
      g_value_set_object (value, action->private_data->gicon);
      break;
    case PROP_VISIBLE_HORIZONTAL:
      g_value_set_boolean (value, action->private_data->visible_horizontal);
      break;
    case PROP_VISIBLE_VERTICAL:
      g_value_set_boolean (value, action->private_data->visible_vertical);
      break;
    case PROP_VISIBLE_OVERFLOWN:
      g_value_set_boolean (value, action->private_data->visible_overflown);
      break;
    case PROP_IS_IMPORTANT:
      g_value_set_boolean (value, action->private_data->is_important);
      break;
    case PROP_HIDE_IF_EMPTY:
      g_value_set_boolean (value, action->private_data->hide_if_empty);
      break;
    case PROP_SENSITIVE:
      g_value_set_boolean (value, action->private_data->sensitive);
      break;
    case PROP_VISIBLE:
      g_value_set_boolean (value, action->private_data->visible);
      break;
    case PROP_ACTION_GROUP:
      g_value_set_object (value, action->private_data->action_group);
      break;
    case PROP_ALWAYS_SHOW_IMAGE:
      g_value_set_boolean (value, action->private_data->always_show_image);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static GtkWidget *
create_menu_item (GtkAction *action)
{
  GType menu_item_type;

  menu_item_type = GTK_ACTION_GET_CLASS (action)->menu_item_type;

  return g_object_new (menu_item_type, NULL);
}

static GtkWidget *
create_tool_item (GtkAction *action)
{
  GType toolbar_item_type;

  toolbar_item_type = GTK_ACTION_GET_CLASS (action)->toolbar_item_type;

  return g_object_new (toolbar_item_type, NULL);
}

static void
remove_proxy (GtkAction *action,
GtkWidget *proxy)
{
  action->private_data->proxies = g_slist_remove (action->private_data->proxies, proxy);
}

static void
connect_proxy (GtkAction *action,
GtkWidget *proxy)
{
  action->private_data->proxies = g_slist_prepend (action->private_data->proxies, proxy);

  if (action->private_data->action_group)
    _gtk_action_group_emit_connect_proxy (action->private_data->action_group, action, proxy);

}

static void
disconnect_proxy (GtkAction *action,
GtkWidget *proxy)
{
  remove_proxy (action, proxy);

  if (action->private_data->action_group)
    _gtk_action_group_emit_disconnect_proxy (action->private_data->action_group, action, proxy);
}

/**
* _gtk_action_sync_menu_visible:
* @action: (allow-none): a #GtkAction, or %NULL to determine the action from @proxy
* @proxy: a proxy menu item
* @empty: whether the submenu attached to @proxy is empty
*
* Updates the visibility of @proxy from the visibility of @action
* according to the following rules:
* <itemizedlist>
* <listitem><para>if @action is invisible, @proxy is too
* </para></listitem>
* <listitem><para>if @empty is %TRUE, hide @proxy unless the "hide-if-empty"
* property of @action indicates otherwise
* </para></listitem>
* </itemizedlist>
*
* This function is used in the implementation of #GtkUIManager.
**/
void
_gtk_action_sync_menu_visible (GtkAction *action,
GtkWidget *proxy,
gboolean empty)
{
  gboolean visible = TRUE;
  gboolean hide_if_empty = TRUE;

  g_return_if_fail (GTK_IS_MENU_ITEM (proxy));
  g_return_if_fail (action == NULL || GTK_IS_ACTION (action));

  if (action == NULL)
    action = gtk_activatable_get_related_action (GTK_ACTIVATABLE (proxy));

  if (action)
    {
      /* a GtkMenu for a <popup/> doesn't have to have an action */
      visible = gtk_action_is_visible (action);
      hide_if_empty = action->private_data->hide_if_empty;
    }

  if (visible && !(empty && hide_if_empty))
    gtk_widget_show (proxy);
  else
    gtk_widget_hide (proxy);
}

void
_gtk_action_emit_activate (GtkAction *action)
{
  GtkActionGroup *group = action->private_data->action_group;

  if (group != NULL)
    {
      g_object_ref (group);
      _gtk_action_group_emit_pre_activate (group, action);
    }

    g_signal_emit (action, action_signals[ACTIVATE], 0);

  if (group != NULL)
    {
      _gtk_action_group_emit_post_activate (group, action);
      g_object_unref (group);
    }
}

/**
* gtk_action_activate:
* @action: the action object
*
* Emits the "activate" signal on the specified action, if it isn't
* insensitive. This gets called by the proxy widgets when they get
* activated.
*
* It can also be used to manually activate an action.
*
* Since: 2.4
*/
void
gtk_action_activate (GtkAction *action)
{
  g_return_if_fail (GTK_IS_ACTION (action));
  
  if (action->private_data->activate_blocked)
    return;

  if (gtk_action_is_sensitive (action))
    _gtk_action_emit_activate (action);
}

/**
* gtk_action_block_activate:
* @action: a #GtkAction
*
* Disable activation signals from the action
*
* This is needed when updating the state of your proxy
* #GtkActivatable widget could result in calling gtk_action_activate(),
* this is a convenience function to avoid recursing in those
* cases (updating toggle state for instance).
*
* Since: 2.16
*/
void
gtk_action_block_activate (GtkAction *action)
{
  g_return_if_fail (GTK_IS_ACTION (action));

  action->private_data->activate_blocked = TRUE;
}

/**
* gtk_action_unblock_activate:
* @action: a #GtkAction
*
* Reenable activation signals from the action
*
* Since: 2.16
*/
void
gtk_action_unblock_activate (GtkAction *action)
{
  g_return_if_fail (GTK_IS_ACTION (action));

  action->private_data->activate_blocked = FALSE;
}

/**
* gtk_action_create_icon:
* @action: the action object
* @icon_size: (type int): the size of the icon that should be created.
*
* This function is intended for use by action implementations to
* create icons displayed in the proxy widgets.
*
* Returns: (transfer none): a widget that displays the icon for this action.
*
* Since: 2.4
*/
GtkWidget *
gtk_action_create_icon (GtkAction *action, GtkIconSize icon_size)
{
  g_return_val_if_fail (GTK_IS_ACTION (action), NULL);

  if (action->private_data->stock_id &&
      gtk_icon_factory_lookup_default (action->private_data->stock_id))
    return gtk_image_new_from_stock (action->private_data->stock_id, icon_size);
  else if (action->private_data->gicon)
    return gtk_image_new_from_gicon (action->private_data->gicon, icon_size);
  else if (action->private_data->icon_name)
    return gtk_image_new_from_icon_name (action->private_data->icon_name, icon_size);
  else
    return NULL;
}

/**
* gtk_action_create_menu_item:
* @action: the action object
*
* Creates a menu item widget that proxies for the given action.
*
* Returns: (transfer none): a menu item connected to the action.
*
* Since: 2.4
*/
GtkWidget *
gtk_action_create_menu_item (GtkAction *action)
{
  GtkWidget *menu_item;

  g_return_val_if_fail (GTK_IS_ACTION (action), NULL);

  menu_item = GTK_ACTION_GET_CLASS (action)->create_menu_item (action);

  gtk_activatable_set_use_action_appearance (GTK_ACTIVATABLE (menu_item), TRUE);
  gtk_activatable_set_related_action (GTK_ACTIVATABLE (menu_item), action);

  return menu_item;
}

/**
* gtk_action_create_tool_item:
* @action: the action object
*
* Creates a toolbar item widget that proxies for the given action.
*
* Returns: (transfer none): a toolbar item connected to the action.
*
* Since: 2.4
*/
GtkWidget *
gtk_action_create_tool_item (GtkAction *action)
{
  GtkWidget *button;

  g_return_val_if_fail (GTK_IS_ACTION (action), NULL);

  button = GTK_ACTION_GET_CLASS (action)->create_tool_item (action);

  gtk_activatable_set_use_action_appearance (GTK_ACTIVATABLE (button), TRUE);
  gtk_activatable_set_related_action (GTK_ACTIVATABLE (button), action);

  return button;
}

void
_gtk_action_add_to_proxy_list (GtkAction *action,
GtkWidget *proxy)
{
  g_return_if_fail (GTK_IS_ACTION (action));
  g_return_if_fail (GTK_IS_WIDGET (proxy));
 
  GTK_ACTION_GET_CLASS (action)->connect_proxy (action, proxy);
}

void
_gtk_action_remove_from_proxy_list (GtkAction *action,
GtkWidget *proxy)
{
  g_return_if_fail (GTK_IS_ACTION (action));
  g_return_if_fail (GTK_IS_WIDGET (proxy));

  GTK_ACTION_GET_CLASS (action)->disconnect_proxy (action, proxy);
}

/**
* gtk_action_get_proxies:
* @action: the action object
*
* Returns the proxy widgets for an action.
* See also gtk_activatable_get_related_action().
*
* Return value: (element-type GtkWidget) (transfer none): a #GSList of proxy widgets. The list is owned by GTK+
* and must not be modified.
*
* Since: 2.4
**/
GSList*
gtk_action_get_proxies (GtkAction *action)
{
  g_return_val_if_fail (GTK_IS_ACTION (action), NULL);

  return action->private_data->proxies;
}

/**
* gtk_action_get_name:
* @action: the action object
*
* Returns the name of the action.
*
* Return value: the name of the action. The string belongs to GTK+ and should not
* be freed.
*
* Since: 2.4
**/
const gchar *
gtk_action_get_name (GtkAction *action)
{
  g_return_val_if_fail (GTK_IS_ACTION (action), NULL);

  return action->private_data->name;
}

/**
* gtk_action_is_sensitive:
* @action: the action object
*
* Returns whether the action is effectively sensitive.
*
* Return value: %TRUE if the action and its associated action group
* are both sensitive.
*
* Since: 2.4
**/
gboolean
gtk_action_is_sensitive (GtkAction *action)
{
  GtkActionPrivate *priv;
  g_return_val_if_fail (GTK_IS_ACTION (action), FALSE);

  priv = action->private_data;
  return priv->sensitive &&
    (priv->action_group == NULL ||
     gtk_action_group_get_sensitive (priv->action_group));
}

/**
* gtk_action_get_sensitive:
* @action: the action object
*
* Returns whether the action itself is sensitive. Note that this doesn't
* necessarily mean effective sensitivity. See gtk_action_is_sensitive()
* for that.
*
* Return value: %TRUE if the action itself is sensitive.
*
* Since: 2.4
**/
gboolean
gtk_action_get_sensitive (GtkAction *action)
{
  g_return_val_if_fail (GTK_IS_ACTION (action), FALSE);

  return action->private_data->sensitive;
}

/**
* gtk_action_set_sensitive:
* @action: the action object
* @sensitive: %TRUE to make the action sensitive
*
* Sets the ::sensitive property of the action to @sensitive. Note that
* this doesn't necessarily mean effective sensitivity. See
* gtk_action_is_sensitive()
* for that.
*
* Since: 2.6
**/
void
gtk_action_set_sensitive (GtkAction *action,
gboolean sensitive)
{
  g_return_if_fail (GTK_IS_ACTION (action));

  sensitive = sensitive != FALSE;
  
  if (action->private_data->sensitive != sensitive)
    {
      action->private_data->sensitive = sensitive;

      g_object_notify (G_OBJECT (action), "sensitive");
    }
}

/**
* gtk_action_is_visible:
* @action: the action object
*
* Returns whether the action is effectively visible.
*
* Return value: %TRUE if the action and its associated action group
* are both visible.
*
* Since: 2.4
**/
gboolean
gtk_action_is_visible (GtkAction *action)
{
  GtkActionPrivate *priv;
  g_return_val_if_fail (GTK_IS_ACTION (action), FALSE);

  priv = action->private_data;
  return priv->visible &&
    (priv->action_group == NULL ||
     gtk_action_group_get_visible (priv->action_group));
}

/**
* gtk_action_get_visible:
* @action: the action object
*
* Returns whether the action itself is visible. Note that this doesn't
* necessarily mean effective visibility. See gtk_action_is_sensitive()
* for that.
*
* Return value: %TRUE if the action itself is visible.
*
* Since: 2.4
**/
gboolean
gtk_action_get_visible (GtkAction *action)
{
  g_return_val_if_fail (GTK_IS_ACTION (action), FALSE);

  return action->private_data->visible;
}

/**
* gtk_action_set_visible:
* @action: the action object
* @visible: %TRUE to make the action visible
*
* Sets the ::visible property of the action to @visible. Note that
* this doesn't necessarily mean effective visibility. See
* gtk_action_is_visible()
* for that.
*
* Since: 2.6
**/
void
gtk_action_set_visible (GtkAction *action,
gboolean visible)
{
  g_return_if_fail (GTK_IS_ACTION (action));

  visible = visible != FALSE;
  
  if (action->private_data->visible != visible)
    {
      action->private_data->visible = visible;

      g_object_notify (G_OBJECT (action), "visible");
    }
}
/**
* gtk_action_set_is_important:
* @action: the action object
* @is_important: %TRUE to make the action important
*
* Sets whether the action is important, this attribute is used
* primarily by toolbar items to decide whether to show a label
* or not.
*
* Since: 2.16
*/
void
gtk_action_set_is_important (GtkAction *action,
gboolean is_important)
{
  g_return_if_fail (GTK_IS_ACTION (action));

  is_important = is_important != FALSE;
  
  if (action->private_data->is_important != is_important)
    {
      action->private_data->is_important = is_important;
      
      g_object_notify (G_OBJECT (action), "is-important");
    }
}

/**
* gtk_action_get_is_important:
* @action: a #GtkAction
*
* Checks whether @action is important or not
*
* Returns: whether @action is important
*
* Since: 2.16
*/
gboolean
gtk_action_get_is_important (GtkAction *action)
{
  g_return_val_if_fail (GTK_IS_ACTION (action), FALSE);

  return action->private_data->is_important;
}

/**
* gtk_action_set_always_show_image:
* @action: a #GtkAction
* @always_show: %TRUE if menuitem proxies should always show their image
*
* Sets whether @action<!-- -->'s menu item proxies will ignore the
* #GtkSettings:gtk-menu-images setting and always show their image, if available.
*
* Use this if the menu item would be useless or hard to use
* without their image.
*
* Since: 2.20
*/
void
gtk_action_set_always_show_image (GtkAction *action,
                                  gboolean always_show)
{
  GtkActionPrivate *priv;

  g_return_if_fail (GTK_IS_ACTION (action));

  priv = action->private_data;

  always_show = always_show != FALSE;
  
  if (priv->always_show_image != always_show)
    {
      priv->always_show_image = always_show;

      g_object_notify (G_OBJECT (action), "always-show-image");
    }
}

/**
* gtk_action_get_always_show_image:
* @action: a #GtkAction
*
* Returns whether @action<!-- -->'s menu item proxies will ignore the
* #GtkSettings:gtk-menu-images setting and always show their image,
* if available.
*
* Returns: %TRUE if the menu item proxies will always show their image
*
* Since: 2.20
*/
gboolean
gtk_action_get_always_show_image (GtkAction *action)
{
  g_return_val_if_fail (GTK_IS_ACTION (action), FALSE);

  return action->private_data->always_show_image;
}

/**
* gtk_action_set_label:
* @action: a #GtkAction
* @label: the label text to set
*
* Sets the label of @action.
*
* Since: 2.16
*/
void
gtk_action_set_label (GtkAction *action,
const gchar *label)
{
  gchar *tmp;
  
  g_return_if_fail (GTK_IS_ACTION (action));
  
  tmp = action->private_data->label;
  action->private_data->label = g_strdup (label);
  g_free (tmp);
  action->private_data->label_set = (action->private_data->label != NULL);
  /* if label is unset, then use the label from the stock item */
  if (!action->private_data->label_set && action->private_data->stock_id)
    {
      GtkStockItem stock_item;
      
      if (gtk_stock_lookup (action->private_data->stock_id, &stock_item))
action->private_data->label = g_strdup (stock_item.label);
    }

  g_object_notify (G_OBJECT (action), "label");
  
  /* if short_label is unset, set short_label=label */
  if (!action->private_data->short_label_set)
    {
      gtk_action_set_short_label (action, action->private_data->label);
      action->private_data->short_label_set = FALSE;
    }
}

/**
* gtk_action_get_label:
* @action: a #GtkAction
*
* Gets the label text of @action.
*
* Returns: the label text
*
* Since: 2.16
*/
const gchar *
gtk_action_get_label (GtkAction *action)
{
  g_return_val_if_fail (GTK_IS_ACTION (action), NULL);

  return action->private_data->label;
}

/**
* gtk_action_set_short_label:
* @action: a #GtkAction
* @short_label: the label text to set
*
* Sets a shorter label text on @action.
*
* Since: 2.16
*/
void
gtk_action_set_short_label (GtkAction *action,
const gchar *short_label)
{
  gchar *tmp;

  g_return_if_fail (GTK_IS_ACTION (action));

  tmp = action->private_data->short_label;
  action->private_data->short_label = g_strdup (short_label);
  g_free (tmp);
  action->private_data->short_label_set = (action->private_data->short_label != NULL);
  /* if short_label is unset, then use the value of label */
  if (!action->private_data->short_label_set)
    action->private_data->short_label = g_strdup (action->private_data->label);

  g_object_notify (G_OBJECT (action), "short-label");
}

/**
* gtk_action_get_short_label:
* @action: a #GtkAction
*
* Gets the short label text of @action.
*
* Returns: the short label text.
*
* Since: 2.16
*/
const gchar *
gtk_action_get_short_label (GtkAction *action)
{
  g_return_val_if_fail (GTK_IS_ACTION (action), NULL);

  return action->private_data->short_label;
}

/**
* gtk_action_set_visible_horizontal:
* @action: a #GtkAction
* @visible_horizontal: whether the action is visible horizontally
*
* Sets whether @action is visible when horizontal
*
* Since: 2.16
*/
void
gtk_action_set_visible_horizontal (GtkAction *action,
gboolean visible_horizontal)
{
  g_return_if_fail (GTK_IS_ACTION (action));

  g_return_if_fail (GTK_IS_ACTION (action));

  visible_horizontal = visible_horizontal != FALSE;
  
  if (action->private_data->visible_horizontal != visible_horizontal)
    {
      action->private_data->visible_horizontal = visible_horizontal;
      
      g_object_notify (G_OBJECT (action), "visible-horizontal");
    }
}

/**
* gtk_action_get_visible_horizontal:
* @action: a #GtkAction
*
* Checks whether @action is visible when horizontal
*
* Returns: whether @action is visible when horizontal
*
* Since: 2.16
*/
gboolean
gtk_action_get_visible_horizontal (GtkAction *action)
{
  g_return_val_if_fail (GTK_IS_ACTION (action), FALSE);

  return action->private_data->visible_horizontal;
}

/**
* gtk_action_set_visible_vertical:
* @action: a #GtkAction
* @visible_vertical: whether the action is visible vertically
*
* Sets whether @action is visible when vertical
*
* Since: 2.16
*/
void
gtk_action_set_visible_vertical (GtkAction *action,
gboolean visible_vertical)
{
  g_return_if_fail (GTK_IS_ACTION (action));

  g_return_if_fail (GTK_IS_ACTION (action));

  visible_vertical = visible_vertical != FALSE;
  
  if (action->private_data->visible_vertical != visible_vertical)
    {
      action->private_data->visible_vertical = visible_vertical;
      
      g_object_notify (G_OBJECT (action), "visible-vertical");
    }
}

/**
* gtk_action_get_visible_vertical:
* @action: a #GtkAction
*
* Checks whether @action is visible when horizontal
*
* Returns: whether @action is visible when horizontal
*
* Since: 2.16
*/
gboolean
gtk_action_get_visible_vertical (GtkAction *action)
{
  g_return_val_if_fail (GTK_IS_ACTION (action), FALSE);

  return action->private_data->visible_vertical;
}

/**
* gtk_action_set_tooltip:
* @action: a #GtkAction
* @tooltip: the tooltip text
*
* Sets the tooltip text on @action
*
* Since: 2.16
*/
void
gtk_action_set_tooltip (GtkAction *action,
const gchar *tooltip)
{
  gchar *tmp;

  g_return_if_fail (GTK_IS_ACTION (action));

  tmp = action->private_data->tooltip;
  action->private_data->tooltip = g_strdup (tooltip);
  g_free (tmp);

  g_object_notify (G_OBJECT (action), "tooltip");
}

/**
* gtk_action_get_tooltip:
* @action: a #GtkAction
*
* Gets the tooltip text of @action.
*
* Returns: the tooltip text
*
* Since: 2.16
*/
const gchar *
gtk_action_get_tooltip (GtkAction *action)
{
  g_return_val_if_fail (GTK_IS_ACTION (action), NULL);

  return action->private_data->tooltip;
}

/**
* gtk_action_set_stock_id:
* @action: a #GtkAction
* @stock_id: the stock id
*
* Sets the stock id on @action
*
* Since: 2.16
*/
void
gtk_action_set_stock_id (GtkAction *action,
const gchar *stock_id)
{
  gchar *tmp;

  g_return_if_fail (GTK_IS_ACTION (action));

  g_return_if_fail (GTK_IS_ACTION (action));

  tmp = action->private_data->stock_id;
  action->private_data->stock_id = g_strdup (stock_id);
  g_free (tmp);

  g_object_notify (G_OBJECT (action), "stock-id");
  
  /* update label and short_label if appropriate */
  if (!action->private_data->label_set)
    {
      GtkStockItem stock_item;
      
      if (action->private_data->stock_id &&
gtk_stock_lookup (action->private_data->stock_id, &stock_item))
gtk_action_set_label (action, stock_item.label);
      else
gtk_action_set_label (action, NULL);
      
      action->private_data->label_set = FALSE;
    }
}

/**
* gtk_action_get_stock_id:
* @action: a #GtkAction
*
* Gets the stock id of @action.
*
* Returns: the stock id
*
* Since: 2.16
*/
const gchar *
gtk_action_get_stock_id (GtkAction *action)
{
  g_return_val_if_fail (GTK_IS_ACTION (action), NULL);

  return action->private_data->stock_id;
}

/**
* gtk_action_set_icon_name:
* @action: a #GtkAction
* @icon_name: the icon name to set
*
* Sets the icon name on @action
*
* Since: 2.16
*/
void
gtk_action_set_icon_name (GtkAction *action,
const gchar *icon_name)
{
  gchar *tmp;

  g_return_if_fail (GTK_IS_ACTION (action));

  tmp = action->private_data->icon_name;
  action->private_data->icon_name = g_strdup (icon_name);
  g_free (tmp);

  g_object_notify (G_OBJECT (action), "icon-name");
}

/**
* gtk_action_get_icon_name:
* @action: a #GtkAction
*
* Gets the icon name of @action.
*
* Returns: the icon name
*
* Since: 2.16
*/
const gchar *
gtk_action_get_icon_name (GtkAction *action)
{
  g_return_val_if_fail (GTK_IS_ACTION (action), NULL);

  return action->private_data->icon_name;
}

/**
* gtk_action_set_gicon:
* @action: a #GtkAction
* @icon: the #GIcon to set
*
* Sets the icon of @action.
*
* Since: 2.16
*/
void
gtk_action_set_gicon (GtkAction *action,
                      GIcon *icon)
{
  g_return_if_fail (GTK_IS_ACTION (action));

  if (action->private_data->gicon)
    g_object_unref (action->private_data->gicon);

  action->private_data->gicon = icon;

  if (action->private_data->gicon)
    g_object_ref (action->private_data->gicon);

  g_object_notify (G_OBJECT (action), "gicon");
}

/**
* gtk_action_get_gicon:
* @action: a #GtkAction
*
* Gets the gicon of @action.
*
* Returns: (transfer none): The action's #GIcon if one is set.
*
* Since: 2.16
*/
GIcon *
gtk_action_get_gicon (GtkAction *action)
{
  g_return_val_if_fail (GTK_IS_ACTION (action), NULL);

  return action->private_data->gicon;
}

static void
closure_accel_activate (GClosure *closure,
                        GValue *return_value,
                        guint n_param_values,
                        const GValue *param_values,
                        gpointer invocation_hint,
                        gpointer marshal_data)
{
  if (gtk_action_is_sensitive (GTK_ACTION (closure->data)))
    {
      _gtk_action_emit_activate (GTK_ACTION (closure->data));
      
      /* we handled the accelerator */
      g_value_set_boolean (return_value, TRUE);
    }
}

static void
gtk_action_set_action_group (GtkAction *action,
GtkActionGroup *action_group)
{
  if (action->private_data->action_group == NULL)
    g_return_if_fail (GTK_IS_ACTION_GROUP (action_group));
  else
    g_return_if_fail (action_group == NULL);

  action->private_data->action_group = action_group;
}

/**
* gtk_action_set_accel_path:
* @action: the action object
* @accel_path: the accelerator path
*
* Sets the accel path for this action. All proxy widgets associated
* with the action will have this accel path, so that their
* accelerators are consistent.
*
* Note that @accel_path string will be stored in a #GQuark. Therefore, if you
* pass a static string, you can save some memory by interning it first with
* g_intern_static_string().
*
* Since: 2.4
*/
void
gtk_action_set_accel_path (GtkAction *action,
const gchar *accel_path)
{
  g_return_if_fail (GTK_IS_ACTION (action));

  action->private_data->accel_quark = g_quark_from_string (accel_path);
}

/**
* gtk_action_get_accel_path:
* @action: the action object
*
* Returns the accel path for this action.
*
* Since: 2.6
*
* Returns: the accel path for this action, or %NULL
* if none is set. The returned string is owned by GTK+
* and must not be freed or modified.
*/
const gchar *
gtk_action_get_accel_path (GtkAction *action)
{
  g_return_val_if_fail (GTK_IS_ACTION (action), NULL);

  if (action->private_data->accel_quark)
    return g_quark_to_string (action->private_data->accel_quark);
  else
    return NULL;
}

/**
* gtk_action_get_accel_closure:
* @action: the action object
*
* Returns the accel closure for this action.
*
* Since: 2.8
*
* Returns: (transfer none): the accel closure for this action. The
* returned closure is owned by GTK+ and must not be unreffed
* or modified.
*/
GClosure *
gtk_action_get_accel_closure (GtkAction *action)
{
  g_return_val_if_fail (GTK_IS_ACTION (action), NULL);

  return action->private_data->accel_closure;
}


/**
* gtk_action_set_accel_group:
* @action: the action object
* @accel_group: (allow-none): a #GtkAccelGroup or %NULL
*
* Sets the #GtkAccelGroup in which the accelerator for this action
* will be installed.
*
* Since: 2.4
**/
void
gtk_action_set_accel_group (GtkAction *action,
GtkAccelGroup *accel_group)
{
  g_return_if_fail (GTK_IS_ACTION (action));
  g_return_if_fail (accel_group == NULL || GTK_IS_ACCEL_GROUP (accel_group));
  
  if (accel_group)
    g_object_ref (accel_group);
  if (action->private_data->accel_group)
    g_object_unref (action->private_data->accel_group);

  action->private_data->accel_group = accel_group;
}

/**
* gtk_action_connect_accelerator:
* @action: a #GtkAction
*
* Installs the accelerator for @action if @action has an
* accel path and group. See gtk_action_set_accel_path() and
* gtk_action_set_accel_group()
*
* Since multiple proxies may independently trigger the installation
* of the accelerator, the @action counts the number of times this
* function has been called and doesn't remove the accelerator until
* gtk_action_disconnect_accelerator() has been called as many times.
*
* Since: 2.4
**/
void
gtk_action_connect_accelerator (GtkAction *action)
{
  g_return_if_fail (GTK_IS_ACTION (action));

  if (!action->private_data->accel_quark ||
      !action->private_data->accel_group)
    return;

  if (action->private_data->accel_count == 0)
    {
      const gchar *accel_path =
g_quark_to_string (action->private_data->accel_quark);
      
      gtk_accel_group_connect_by_path (action->private_data->accel_group,
accel_path,
action->private_data->accel_closure);
    }

  action->private_data->accel_count++;
}

/**
* gtk_action_disconnect_accelerator:
* @action: a #GtkAction
*
* Undoes the effect of one call to gtk_action_connect_accelerator().
*
* Since: 2.4
**/
void
gtk_action_disconnect_accelerator (GtkAction *action)
{
  g_return_if_fail (GTK_IS_ACTION (action));

  if (!action->private_data->accel_quark ||
      !action->private_data->accel_group)
    return;

  action->private_data->accel_count--;

  if (action->private_data->accel_count == 0)
    gtk_accel_group_disconnect (action->private_data->accel_group,
action->private_data->accel_closure);
}

/**
* gtk_action_create_menu:
* @action: a #GtkAction
*
* If @action provides a #GtkMenu widget as a submenu for the menu
* item or the toolbar item it creates, this function returns an
* instance of that menu.
*
* Return value: (transfer none): the menu item provided by the
* action, or %NULL.
*
* Since: 2.12
*/
GtkWidget *
gtk_action_create_menu (GtkAction *action)
{
  g_return_val_if_fail (GTK_IS_ACTION (action), NULL);

  if (GTK_ACTION_GET_CLASS (action)->create_menu)
    return GTK_ACTION_GET_CLASS (action)->create_menu (action);

  return NULL;
}
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