gtk/gtkmenutoolbutton.c - external/github.com/GNOME/gtk.git - Git at Google

 /* GTK - The GIMP Toolkit
  *
  * Copyright (C) 2003 Ricardo Fernandez Pascual
  * Copyright (C) 2004 Paolo Borelli
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser 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
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library. If not, see <http://www.gnu.org/licenses/>.
  */

 #include "config.h"

 #include "gtkmenutoolbutton.h"

 #include "gtktogglebutton.h"
 #include "gtkarrow.h"
 #include "gtkmenubutton.h"
 #include "gtkmenubuttonprivate.h"
 #include "gtkbox.h"
 #include "gtkmenu.h"
 #include "gtkmain.h"
 #include "gtksizerequest.h"
 #include "gtkbuildable.h"

 #include "gtkprivate.h"
 #include "gtkintl.h"


 /**
  * SECTION:gtkmenutoolbutton
  * @Short_description: A GtkToolItem containing a button with an additional dropdown menu
  * @Title: GtkMenuToolButton
  * @See_also: #GtkToolbar, #GtkToolButton
  *
  * A #GtkMenuToolButton is a #GtkToolItem that contains a button and
  * a small additional button with an arrow. When clicked, the arrow
  * button pops up a dropdown menu.
  *
  * Use gtk_menu_tool_button_new() to create a new
  * #GtkMenuToolButton. Use gtk_menu_tool_button_new_from_stock() to
  * create a new #GtkMenuToolButton containing a stock item.
  *
  * <refsect2 id="GtkMenuToolButton-BUILDER-UI">
  * <title>GtkMenuToolButton as GtkBuildable</title>
  * <para>
  * The GtkMenuToolButton implementation of the GtkBuildable interface
  * supports adding a menu by specifying "menu" as the "type"
  * attribute of a &lt;child&gt; element.
  *
  * <example>
  * <title>A UI definition fragment with menus</title>
  * <programlisting><![CDATA[
  * <object class="GtkMenuToolButton">
  *   <child type="menu">
  *     <object class="GtkMenu"/>
  *   </child>
  * </object>
  * ]]></programlisting>
  * </example>
  * </para>
  * </refsect2>
  */


 struct _GtkMenuToolButtonPrivate
 {
   GtkWidget *button;
   GtkWidget *arrow_button;
   GtkWidget *box;
 };

 static void gtk_menu_tool_button_buildable_interface_init (GtkBuildableIface   *iface);
 static void gtk_menu_tool_button_buildable_add_child      (GtkBuildable        *buildable,
 							   GtkBuilder          *builder,
 							   GObject             *child,
 							   const gchar         *type);

 enum
 {
   SHOW_MENU,
   LAST_SIGNAL
 };

 enum
 {
   PROP_0,
   PROP_MENU
 };

 static gint signals[LAST_SIGNAL];

 static GtkBuildableIface *parent_buildable_iface;

 G_DEFINE_TYPE_WITH_CODE (GtkMenuToolButton, gtk_menu_tool_button, GTK_TYPE_TOOL_BUTTON,
                          G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE,
                                                 gtk_menu_tool_button_buildable_interface_init))

 static void
 gtk_menu_tool_button_construct_contents (GtkMenuToolButton *button)
 {
   GtkMenuToolButtonPrivate *priv = button->priv;
   GtkWidget *box;
   GtkWidget *parent;
   GtkOrientation orientation;

   orientation = gtk_tool_item_get_orientation (GTK_TOOL_ITEM (button));

   if (orientation == GTK_ORIENTATION_HORIZONTAL)
     {
       box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
       gtk_menu_button_set_direction (GTK_MENU_BUTTON (priv->arrow_button), GTK_ARROW_DOWN);
     }
   else
     {
       GtkTextDirection direction;
       GtkArrowType type;

       box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
       direction = gtk_widget_get_direction (GTK_WIDGET (button));
       type = (direction == GTK_TEXT_DIR_LTR ? GTK_ARROW_RIGHT : GTK_ARROW_LEFT);
       gtk_menu_button_set_direction (GTK_MENU_BUTTON (priv->arrow_button), type);
     }

   parent = gtk_widget_get_parent (priv->button);
   if (priv->button && parent)
     {
       g_object_ref (priv->button);
       gtk_container_remove (GTK_CONTAINER (parent),
                             priv->button);
       gtk_container_add (GTK_CONTAINER (box), priv->button);
       g_object_unref (priv->button);
     }

   parent = gtk_widget_get_parent (priv->arrow_button);
   if (priv->arrow_button && parent)
     {
       g_object_ref (priv->arrow_button);
       gtk_container_remove (GTK_CONTAINER (parent),
                             priv->arrow_button);
       gtk_box_pack_end (GTK_BOX (box), priv->arrow_button,
                         FALSE, FALSE, 0);
       g_object_unref (priv->arrow_button);
     }

   if (priv->box)
     {
       gchar *tmp;

       /* Transfer a possible tooltip to the new box */
       g_object_get (priv->box, "tooltip-markup", &tmp, NULL);

       if (tmp)
         {
 	  g_object_set (box, "tooltip-markup", tmp, NULL);
 	  g_free (tmp);
 	}

       /* Note: we are not destroying the button and the arrow_button
        * here because they were removed from their container above
        */
       gtk_widget_destroy (priv->box);
     }

   priv->box = box;

   gtk_container_add (GTK_CONTAINER (button), priv->box);
   gtk_widget_show_all (priv->box);

   gtk_button_set_relief (GTK_BUTTON (priv->arrow_button),
 			 gtk_tool_item_get_relief_style (GTK_TOOL_ITEM (button)));

   gtk_widget_queue_resize (GTK_WIDGET (button));
 }

 static void
 gtk_menu_tool_button_toolbar_reconfigured (GtkToolItem *toolitem)
 {
   gtk_menu_tool_button_construct_contents (GTK_MENU_TOOL_BUTTON (toolitem));

   /* chain up */
   GTK_TOOL_ITEM_CLASS (gtk_menu_tool_button_parent_class)->toolbar_reconfigured (toolitem);
 }

 static void
 gtk_menu_tool_button_set_property (GObject      *object,
                                    guint         prop_id,
                                    const GValue *value,
                                    GParamSpec   *pspec)
 {
   GtkMenuToolButton *button = GTK_MENU_TOOL_BUTTON (object);

   switch (prop_id)
     {
     case PROP_MENU:
       gtk_menu_tool_button_set_menu (button, g_value_get_object (value));
       break;

     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
     }
 }

 static void
 gtk_menu_tool_button_get_property (GObject    *object,
                                    guint       prop_id,
                                    GValue     *value,
                                    GParamSpec *pspec)
 {
   GtkMenuToolButton *button = GTK_MENU_TOOL_BUTTON (object);

   switch (prop_id)
     {
     case PROP_MENU:
       g_value_set_object (value, gtk_menu_button_get_popup (GTK_MENU_BUTTON (button->priv->arrow_button)));
       break;

     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
     }
 }

 static void
 gtk_menu_tool_button_class_init (GtkMenuToolButtonClass *klass)
 {
   GObjectClass *object_class;
   GtkToolItemClass *toolitem_class;

   object_class = (GObjectClass *)klass;
   toolitem_class = (GtkToolItemClass *)klass;

   object_class->set_property = gtk_menu_tool_button_set_property;
   object_class->get_property = gtk_menu_tool_button_get_property;

   toolitem_class->toolbar_reconfigured = gtk_menu_tool_button_toolbar_reconfigured;

   /**
    * GtkMenuToolButton::show-menu:
    * @button: the object on which the signal is emitted
    *
    * The ::show-menu signal is emitted before the menu is shown.
    *
    * It can be used to populate the menu on demand, using
    * gtk_menu_tool_button_set_menu().

    * Note that even if you populate the menu dynamically in this way,
    * you must set an empty menu on the #GtkMenuToolButton beforehand,
    * since the arrow is made insensitive if the menu is not set.
    */
   signals[SHOW_MENU] =
     g_signal_new (I_("show-menu"),
                   G_OBJECT_CLASS_TYPE (klass),
                   G_SIGNAL_RUN_FIRST,
                   G_STRUCT_OFFSET (GtkMenuToolButtonClass, show_menu),
                   NULL, NULL,
                   g_cclosure_marshal_VOID__VOID,
                   G_TYPE_NONE, 0);

   g_object_class_install_property (object_class,
                                    PROP_MENU,
                                    g_param_spec_object ("menu",
                                                         P_("Menu"),
                                                         P_("The dropdown menu"),
                                                         GTK_TYPE_MENU,
                                                         GTK_PARAM_READWRITE));

   g_type_class_add_private (object_class, sizeof (GtkMenuToolButtonPrivate));
 }

 static void
 gtk_menu_tool_button_init (GtkMenuToolButton *button)
 {
   GtkWidget *box;
   GtkWidget *arrow_button;
   GtkWidget *real_button;

   button->priv = G_TYPE_INSTANCE_GET_PRIVATE (button,
                                               GTK_TYPE_MENU_TOOL_BUTTON,
                                               GtkMenuToolButtonPrivate);

   gtk_tool_item_set_homogeneous (GTK_TOOL_ITEM (button), FALSE);

   box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);

   real_button = gtk_bin_get_child (GTK_BIN (button));
   g_object_ref (real_button);
   gtk_container_remove (GTK_CONTAINER (button), real_button);
   gtk_container_add (GTK_CONTAINER (box), real_button);
   g_object_unref (real_button);

   arrow_button = gtk_menu_button_new ();
   gtk_box_pack_end (GTK_BOX (box), arrow_button,
                     FALSE, FALSE, 0);

   /* the arrow button is insentive until we set a menu */
   gtk_widget_set_sensitive (arrow_button, FALSE);

   gtk_widget_show_all (box);

   gtk_container_add (GTK_CONTAINER (button), box);
   gtk_menu_button_set_align_widget (GTK_MENU_BUTTON (arrow_button),
                                     GTK_WIDGET (button));

   button->priv->button = real_button;
   button->priv->arrow_button = arrow_button;
   button->priv->box = box;
 }

 static void
 gtk_menu_tool_button_buildable_add_child (GtkBuildable *buildable,
 					  GtkBuilder   *builder,
 					  GObject      *child,
 					  const gchar  *type)
 {
   if (type && strcmp (type, "menu") == 0)
     gtk_menu_tool_button_set_menu (GTK_MENU_TOOL_BUTTON (buildable),
                                    GTK_WIDGET (child));
   else
     parent_buildable_iface->add_child (buildable, builder, child, type);
 }

 static void
 gtk_menu_tool_button_buildable_interface_init (GtkBuildableIface *iface)
 {
   parent_buildable_iface = g_type_interface_peek_parent (iface);
   iface->add_child = gtk_menu_tool_button_buildable_add_child;
 }

 /**
  * gtk_menu_tool_button_new:
  * @icon_widget: (allow-none): a widget that will be used as icon widget, or %NULL
  * @label: (allow-none): a string that will be used as label, or %NULL
  *
  * Creates a new #GtkMenuToolButton using @icon_widget as icon and
  * @label as label.
  *
  * Return value: the new #GtkMenuToolButton
  *
  * Since: 2.6
  **/
 GtkToolItem *
 gtk_menu_tool_button_new (GtkWidget   *icon_widget,
                           const gchar *label)
 {
   GtkMenuToolButton *button;

   button = g_object_new (GTK_TYPE_MENU_TOOL_BUTTON, NULL);

   if (label)
     gtk_tool_button_set_label (GTK_TOOL_BUTTON (button), label);

   if (icon_widget)
     gtk_tool_button_set_icon_widget (GTK_TOOL_BUTTON (button), icon_widget);

   return GTK_TOOL_ITEM (button);
 }

 /**
  * gtk_menu_tool_button_new_from_stock:
  * @stock_id: the name of a stock item
  *
  * Creates a new #GtkMenuToolButton.
  * The new #GtkMenuToolButton will contain an icon and label from
  * the stock item indicated by @stock_id.
  *
  * Return value: the new #GtkMenuToolButton
  *
  * Since: 2.6
  **/
 GtkToolItem *
 gtk_menu_tool_button_new_from_stock (const gchar *stock_id)
 {
   GtkMenuToolButton *button;

   g_return_val_if_fail (stock_id != NULL, NULL);

   button = g_object_new (GTK_TYPE_MENU_TOOL_BUTTON,
 			 "stock-id", stock_id,
 			 NULL);

   return GTK_TOOL_ITEM (button);
 }

 static void
 _show_menu_emit (gpointer user_data)
 {
   GtkMenuToolButton *button = (GtkMenuToolButton *) user_data;
   g_signal_emit (button, signals[SHOW_MENU], 0);
 }

 /**
  * gtk_menu_tool_button_set_menu:
  * @button: a #GtkMenuToolButton
  * @menu: the #GtkMenu associated with #GtkMenuToolButton
  *
  * Sets the #GtkMenu that is popped up when the user clicks on the arrow.
  * If @menu is NULL, the arrow button becomes insensitive.
  *
  * Since: 2.6
  **/
 void
 gtk_menu_tool_button_set_menu (GtkMenuToolButton *button,
                                GtkWidget         *menu)
 {
   GtkMenuToolButtonPrivate *priv;

   g_return_if_fail (GTK_IS_MENU_TOOL_BUTTON (button));
   g_return_if_fail (GTK_IS_MENU (menu) || menu == NULL);

   priv = button->priv;

   _gtk_menu_button_set_popup_with_func (GTK_MENU_BUTTON (priv->arrow_button),
                                         menu,
                                         _show_menu_emit,
                                         button);

   g_object_notify (G_OBJECT (button), "menu");
 }

 /**
  * gtk_menu_tool_button_get_menu:
  * @button: a #GtkMenuToolButton
  *
  * Gets the #GtkMenu associated with #GtkMenuToolButton.
  *
  * Return value: (transfer none): the #GtkMenu associated
  *     with #GtkMenuToolButton
  *
  * Since: 2.6
  **/
 GtkWidget *
 gtk_menu_tool_button_get_menu (GtkMenuToolButton *button)
 {
   GtkMenu *ret;

   g_return_val_if_fail (GTK_IS_MENU_TOOL_BUTTON (button), NULL);

   ret = gtk_menu_button_get_popup (GTK_MENU_BUTTON (button->priv->arrow_button));
   if (!ret)
     return NULL;

   return GTK_WIDGET (ret);
 }

 /**
  * gtk_menu_tool_button_set_arrow_tooltip_text:
  * @button: a #GtkMenuToolButton
  * @text: text to be used as tooltip text for button's arrow button
  *
  * Sets the tooltip text to be used as tooltip for the arrow button which
  * pops up the menu.  See gtk_tool_item_set_tooltip_text() for setting a tooltip
  * on the whole #GtkMenuToolButton.
  *
  * Since: 2.12
  **/
 void
 gtk_menu_tool_button_set_arrow_tooltip_text (GtkMenuToolButton *button,
 					     const gchar       *text)
 {
   g_return_if_fail (GTK_IS_MENU_TOOL_BUTTON (button));

   gtk_widget_set_tooltip_text (button->priv->arrow_button, text);
 }

 /**
  * gtk_menu_tool_button_set_arrow_tooltip_markup:
  * @button: a #GtkMenuToolButton
  * @markup: markup text to be used as tooltip text for button's arrow button
  *
  * Sets the tooltip markup text to be used as tooltip for the arrow button
  * which pops up the menu.  See gtk_tool_item_set_tooltip_text() for setting a
  * tooltip on the whole #GtkMenuToolButton.
  *
  * Since: 2.12
  **/
 void
 gtk_menu_tool_button_set_arrow_tooltip_markup (GtkMenuToolButton *button,
 					       const gchar       *markup)
 {
   g_return_if_fail (GTK_IS_MENU_TOOL_BUTTON (button));

   gtk_widget_set_tooltip_markup (button->priv->arrow_button, markup);
 }
	/* GTK - The GIMP Toolkit
	*
	* Copyright (C) 2003 Ricardo Fernandez Pascual
	* Copyright (C) 2004 Paolo Borelli
	*
	* This library is free software; you can redistribute it and/or
	* modify it under the terms of the GNU Lesser 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
	* Lesser General Public License for more details.
	*
	* You should have received a copy of the GNU Lesser General Public
	* License along with this library. If not, see <http://www.gnu.org/licenses/>.
	*/

	#include "config.h"

	#include "gtkmenutoolbutton.h"

	#include "gtktogglebutton.h"
	#include "gtkarrow.h"
	#include "gtkmenubutton.h"
	#include "gtkmenubuttonprivate.h"
	#include "gtkbox.h"
	#include "gtkmenu.h"
	#include "gtkmain.h"
	#include "gtksizerequest.h"
	#include "gtkbuildable.h"

	#include "gtkprivate.h"
	#include "gtkintl.h"


	/**
	* SECTION:gtkmenutoolbutton
	* @Short_description: A GtkToolItem containing a button with an additional dropdown menu
	* @Title: GtkMenuToolButton
	* @See_also: #GtkToolbar, #GtkToolButton
	*
	* A #GtkMenuToolButton is a #GtkToolItem that contains a button and
	* a small additional button with an arrow. When clicked, the arrow
	* button pops up a dropdown menu.
	*
	* Use gtk_menu_tool_button_new() to create a new
	* #GtkMenuToolButton. Use gtk_menu_tool_button_new_from_stock() to
	* create a new #GtkMenuToolButton containing a stock item.
	*
	* <refsect2 id="GtkMenuToolButton-BUILDER-UI">
	* <title>GtkMenuToolButton as GtkBuildable</title>
	* <para>
	* The GtkMenuToolButton implementation of the GtkBuildable interface
	* supports adding a menu by specifying "menu" as the "type"
	* attribute of a <child> element.
	*
	* <example>
	* <title>A UI definition fragment with menus</title>
	* <programlisting><![CDATA[
	* <object class="GtkMenuToolButton">
	* <child type="menu">
	* <object class="GtkMenu"/>
	* </child>
	* </object>
	* ]]></programlisting>
	* </example>
	* </para>
	* </refsect2>
	*/


	struct _GtkMenuToolButtonPrivate
	{
	GtkWidget *button;
	GtkWidget *arrow_button;
	GtkWidget *box;
	};

	static void gtk_menu_tool_button_buildable_interface_init (GtkBuildableIface *iface);
	static void gtk_menu_tool_button_buildable_add_child (GtkBuildable *buildable,
	GtkBuilder *builder,
	GObject *child,
	const gchar *type);

	enum
	{
	SHOW_MENU,
	LAST_SIGNAL
	};

	enum
	{
	PROP_0,
	PROP_MENU
	};

	static gint signals[LAST_SIGNAL];

	static GtkBuildableIface *parent_buildable_iface;

	G_DEFINE_TYPE_WITH_CODE (GtkMenuToolButton, gtk_menu_tool_button, GTK_TYPE_TOOL_BUTTON,
	G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE,
	gtk_menu_tool_button_buildable_interface_init))

	static void
	gtk_menu_tool_button_construct_contents (GtkMenuToolButton *button)
	{
	GtkMenuToolButtonPrivate *priv = button->priv;
	GtkWidget *box;
	GtkWidget *parent;
	GtkOrientation orientation;

	orientation = gtk_tool_item_get_orientation (GTK_TOOL_ITEM (button));

	if (orientation == GTK_ORIENTATION_HORIZONTAL)
	{
	box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
	gtk_menu_button_set_direction (GTK_MENU_BUTTON (priv->arrow_button), GTK_ARROW_DOWN);
	}
	else
	{
	GtkTextDirection direction;
	GtkArrowType type;

	box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
	direction = gtk_widget_get_direction (GTK_WIDGET (button));
	type = (direction == GTK_TEXT_DIR_LTR ? GTK_ARROW_RIGHT : GTK_ARROW_LEFT);
	gtk_menu_button_set_direction (GTK_MENU_BUTTON (priv->arrow_button), type);
	}

	parent = gtk_widget_get_parent (priv->button);
	if (priv->button && parent)
	{
	g_object_ref (priv->button);
	gtk_container_remove (GTK_CONTAINER (parent),
	priv->button);
	gtk_container_add (GTK_CONTAINER (box), priv->button);
	g_object_unref (priv->button);
	}

	parent = gtk_widget_get_parent (priv->arrow_button);
	if (priv->arrow_button && parent)
	{
	g_object_ref (priv->arrow_button);
	gtk_container_remove (GTK_CONTAINER (parent),
	priv->arrow_button);
	gtk_box_pack_end (GTK_BOX (box), priv->arrow_button,
	FALSE, FALSE, 0);
	g_object_unref (priv->arrow_button);
	}

	if (priv->box)
	{
	gchar *tmp;

	/* Transfer a possible tooltip to the new box */
	g_object_get (priv->box, "tooltip-markup", &tmp, NULL);

	if (tmp)
	{
	g_object_set (box, "tooltip-markup", tmp, NULL);
	g_free (tmp);
	}

	/* Note: we are not destroying the button and the arrow_button
	* here because they were removed from their container above
	*/
	gtk_widget_destroy (priv->box);
	}

	priv->box = box;

	gtk_container_add (GTK_CONTAINER (button), priv->box);
	gtk_widget_show_all (priv->box);

	gtk_button_set_relief (GTK_BUTTON (priv->arrow_button),
	gtk_tool_item_get_relief_style (GTK_TOOL_ITEM (button)));

	gtk_widget_queue_resize (GTK_WIDGET (button));
	}

	static void
	gtk_menu_tool_button_toolbar_reconfigured (GtkToolItem *toolitem)
	{
	gtk_menu_tool_button_construct_contents (GTK_MENU_TOOL_BUTTON (toolitem));

	/* chain up */
	GTK_TOOL_ITEM_CLASS (gtk_menu_tool_button_parent_class)->toolbar_reconfigured (toolitem);
	}

	static void
	gtk_menu_tool_button_set_property (GObject *object,
	guint prop_id,
	const GValue *value,
	GParamSpec *pspec)
	{
	GtkMenuToolButton *button = GTK_MENU_TOOL_BUTTON (object);

	switch (prop_id)
	{
	case PROP_MENU:
	gtk_menu_tool_button_set_menu (button, g_value_get_object (value));
	break;

	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	break;
	}
	}

	static void
	gtk_menu_tool_button_get_property (GObject *object,
	guint prop_id,
	GValue *value,
	GParamSpec *pspec)
	{
	GtkMenuToolButton *button = GTK_MENU_TOOL_BUTTON (object);

	switch (prop_id)
	{
	case PROP_MENU:
	g_value_set_object (value, gtk_menu_button_get_popup (GTK_MENU_BUTTON (button->priv->arrow_button)));
	break;

	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	break;
	}
	}

	static void
	gtk_menu_tool_button_class_init (GtkMenuToolButtonClass *klass)
	{
	GObjectClass *object_class;
	GtkToolItemClass *toolitem_class;

	object_class = (GObjectClass *)klass;
	toolitem_class = (GtkToolItemClass *)klass;

	object_class->set_property = gtk_menu_tool_button_set_property;
	object_class->get_property = gtk_menu_tool_button_get_property;

	toolitem_class->toolbar_reconfigured = gtk_menu_tool_button_toolbar_reconfigured;

	/**
	* GtkMenuToolButton::show-menu:
	* @button: the object on which the signal is emitted
	*
	* The ::show-menu signal is emitted before the menu is shown.
	*
	* It can be used to populate the menu on demand, using
	* gtk_menu_tool_button_set_menu().

	* Note that even if you populate the menu dynamically in this way,
	* you must set an empty menu on the #GtkMenuToolButton beforehand,
	* since the arrow is made insensitive if the menu is not set.
	*/
	signals[SHOW_MENU] =
	g_signal_new (I_("show-menu"),
	G_OBJECT_CLASS_TYPE (klass),
	G_SIGNAL_RUN_FIRST,
	G_STRUCT_OFFSET (GtkMenuToolButtonClass, show_menu),
	NULL, NULL,
	g_cclosure_marshal_VOID__VOID,
	G_TYPE_NONE, 0);

	g_object_class_install_property (object_class,
	PROP_MENU,
	g_param_spec_object ("menu",
	P_("Menu"),
	P_("The dropdown menu"),
	GTK_TYPE_MENU,
	GTK_PARAM_READWRITE));

	g_type_class_add_private (object_class, sizeof (GtkMenuToolButtonPrivate));
	}

	static void
	gtk_menu_tool_button_init (GtkMenuToolButton *button)
	{
	GtkWidget *box;
	GtkWidget *arrow_button;
	GtkWidget *real_button;

	button->priv = G_TYPE_INSTANCE_GET_PRIVATE (button,
	GTK_TYPE_MENU_TOOL_BUTTON,
	GtkMenuToolButtonPrivate);

	gtk_tool_item_set_homogeneous (GTK_TOOL_ITEM (button), FALSE);

	box = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);

	real_button = gtk_bin_get_child (GTK_BIN (button));
	g_object_ref (real_button);
	gtk_container_remove (GTK_CONTAINER (button), real_button);
	gtk_container_add (GTK_CONTAINER (box), real_button);
	g_object_unref (real_button);

	arrow_button = gtk_menu_button_new ();
	gtk_box_pack_end (GTK_BOX (box), arrow_button,
	FALSE, FALSE, 0);

	/* the arrow button is insentive until we set a menu */
	gtk_widget_set_sensitive (arrow_button, FALSE);

	gtk_widget_show_all (box);

	gtk_container_add (GTK_CONTAINER (button), box);
	gtk_menu_button_set_align_widget (GTK_MENU_BUTTON (arrow_button),
	GTK_WIDGET (button));

	button->priv->button = real_button;
	button->priv->arrow_button = arrow_button;
	button->priv->box = box;
	}

	static void
	gtk_menu_tool_button_buildable_add_child (GtkBuildable *buildable,
	GtkBuilder *builder,
	GObject *child,
	const gchar *type)
	{
	if (type && strcmp (type, "menu") == 0)
	gtk_menu_tool_button_set_menu (GTK_MENU_TOOL_BUTTON (buildable),
	GTK_WIDGET (child));
	else
	parent_buildable_iface->add_child (buildable, builder, child, type);
	}

	static void
	gtk_menu_tool_button_buildable_interface_init (GtkBuildableIface *iface)
	{
	parent_buildable_iface = g_type_interface_peek_parent (iface);
	iface->add_child = gtk_menu_tool_button_buildable_add_child;
	}

	/**
	* gtk_menu_tool_button_new:
	* @icon_widget: (allow-none): a widget that will be used as icon widget, or %NULL
	* @label: (allow-none): a string that will be used as label, or %NULL
	*
	* Creates a new #GtkMenuToolButton using @icon_widget as icon and
	* @label as label.
	*
	* Return value: the new #GtkMenuToolButton
	*
	* Since: 2.6
	**/
	GtkToolItem *
	gtk_menu_tool_button_new (GtkWidget *icon_widget,
	const gchar *label)
	{
	GtkMenuToolButton *button;

	button = g_object_new (GTK_TYPE_MENU_TOOL_BUTTON, NULL);

	if (label)
	gtk_tool_button_set_label (GTK_TOOL_BUTTON (button), label);

	if (icon_widget)
	gtk_tool_button_set_icon_widget (GTK_TOOL_BUTTON (button), icon_widget);

	return GTK_TOOL_ITEM (button);
	}

	/**
	* gtk_menu_tool_button_new_from_stock:
	* @stock_id: the name of a stock item
	*
	* Creates a new #GtkMenuToolButton.
	* The new #GtkMenuToolButton will contain an icon and label from
	* the stock item indicated by @stock_id.
	*
	* Return value: the new #GtkMenuToolButton
	*
	* Since: 2.6
	**/
	GtkToolItem *
	gtk_menu_tool_button_new_from_stock (const gchar *stock_id)
	{
	GtkMenuToolButton *button;

	g_return_val_if_fail (stock_id != NULL, NULL);

	button = g_object_new (GTK_TYPE_MENU_TOOL_BUTTON,
	"stock-id", stock_id,
	NULL);

	return GTK_TOOL_ITEM (button);
	}

	static void
	_show_menu_emit (gpointer user_data)
	{
	GtkMenuToolButton button = (GtkMenuToolButton ) user_data;
	g_signal_emit (button, signals[SHOW_MENU], 0);
	}

	/**
	* gtk_menu_tool_button_set_menu:
	* @button: a #GtkMenuToolButton
	* @menu: the #GtkMenu associated with #GtkMenuToolButton
	*
	* Sets the #GtkMenu that is popped up when the user clicks on the arrow.
	* If @menu is NULL, the arrow button becomes insensitive.
	*
	* Since: 2.6
	**/
	void
	gtk_menu_tool_button_set_menu (GtkMenuToolButton *button,
	GtkWidget *menu)
	{
	GtkMenuToolButtonPrivate *priv;

	g_return_if_fail (GTK_IS_MENU_TOOL_BUTTON (button));
	g_return_if_fail (GTK_IS_MENU (menu) \|\| menu == NULL);

	priv = button->priv;

	_gtk_menu_button_set_popup_with_func (GTK_MENU_BUTTON (priv->arrow_button),
	menu,
	_show_menu_emit,
	button);

	g_object_notify (G_OBJECT (button), "menu");
	}

	/**
	* gtk_menu_tool_button_get_menu:
	* @button: a #GtkMenuToolButton
	*
	* Gets the #GtkMenu associated with #GtkMenuToolButton.
	*
	* Return value: (transfer none): the #GtkMenu associated
	* with #GtkMenuToolButton
	*
	* Since: 2.6
	**/
	GtkWidget *
	gtk_menu_tool_button_get_menu (GtkMenuToolButton *button)
	{
	GtkMenu *ret;

	g_return_val_if_fail (GTK_IS_MENU_TOOL_BUTTON (button), NULL);

	ret = gtk_menu_button_get_popup (GTK_MENU_BUTTON (button->priv->arrow_button));
	if (!ret)
	return NULL;

	return GTK_WIDGET (ret);
	}

	/**
	* gtk_menu_tool_button_set_arrow_tooltip_text:
	* @button: a #GtkMenuToolButton
	* @text: text to be used as tooltip text for button's arrow button
	*
	* Sets the tooltip text to be used as tooltip for the arrow button which
	* pops up the menu. See gtk_tool_item_set_tooltip_text() for setting a tooltip
	* on the whole #GtkMenuToolButton.
	*
	* Since: 2.12
	**/
	void
	gtk_menu_tool_button_set_arrow_tooltip_text (GtkMenuToolButton *button,
	const gchar *text)
	{
	g_return_if_fail (GTK_IS_MENU_TOOL_BUTTON (button));

	gtk_widget_set_tooltip_text (button->priv->arrow_button, text);
	}

	/**
	* gtk_menu_tool_button_set_arrow_tooltip_markup:
	* @button: a #GtkMenuToolButton
	* @markup: markup text to be used as tooltip text for button's arrow button
	*
	* Sets the tooltip markup text to be used as tooltip for the arrow button
	* which pops up the menu. See gtk_tool_item_set_tooltip_text() for setting a
	* tooltip on the whole #GtkMenuToolButton.
	*
	* Since: 2.12
	**/
	void
	gtk_menu_tool_button_set_arrow_tooltip_markup (GtkMenuToolButton *button,
	const gchar *markup)
	{
	g_return_if_fail (GTK_IS_MENU_TOOL_BUTTON (button));

	gtk_widget_set_tooltip_markup (button->priv->arrow_button, markup);
	}