libdbusmenu-glib/menuitem.c

/*
A library to communicate a menu object set accross DBus and
track updates and maintain consistency.

Copyright 2009 Canonical Ltd.

Authors:
    Ted Gould <ted@canonical.com>

This program is free software: you can redistribute it and/or modify it 
under the terms of either or both of the following licenses:

1) the GNU Lesser General Public License version 3, as published by the 
Free Software Foundation; and/or
2) the GNU Lesser General Public License version 2.1, as published by 
the Free Software Foundation.

This program is distributed in the hope that it will be useful, but 
WITHOUT ANY WARRANTY; without even the implied warranties of 
MERCHANTABILITY, SATISFACTORY QUALITY or FITNESS FOR A PARTICULAR 
PURPOSE.  See the applicable version of the GNU Lesser General Public 
License for more details.

You should have received a copy of both the GNU Lesser General Public 
License version 3 and version 2.1 along with this program.  If not, see 
<http://www.gnu.org/licenses/>
*/

#include <stdlib.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "menuitem.h"
#include "menuitem-marshal.h"
#include "menuitem-private.h"
#include "defaults.h"

#ifdef MASSIVEDEBUGGING
#define LABEL(x)  dbusmenu_menuitem_property_get(DBUSMENU_MENUITEM(x), DBUSMENU_MENUITEM_PROP_LABEL)
#define ID(x)     dbusmenu_menuitem_get_id(DBUSMENU_MENUITEM(x))
#endif

/* Private */
/**
	DbusmenuMenuitemPrivate:
	@id: The ID of this menu item
	@children: A list of #DbusmenuMenuitem objects that are
	      children to this one.
	@properties: All of the properties on this menu item.
	@root: Whether this node is the root node

	These are the little secrets that we don't want getting
	out of data that we have.  They can still be gotten using
	accessor functions, but are protected appropriately.
*/
struct _DbusmenuMenuitemPrivate
{
	gint id;
	GList * children;
	GHashTable * properties;
	gboolean root;
	gboolean realized;
	DbusmenuDefaults * defaults;
	gboolean exposed;
	DbusmenuMenuitem * parent;
};

/* Signals */
enum {
	PROPERTY_CHANGED,
	ITEM_ACTIVATED,
	CHILD_ADDED,
	CHILD_REMOVED,
	CHILD_MOVED,
	REALIZED,
	SHOW_TO_USER,
	ABOUT_TO_SHOW,
	EVENT,
	LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = { 0 };

/* Properties */
enum {
	PROP_0,
	PROP_ID,
};

#define PROP_ID_S  "id"

#define DBUSMENU_MENUITEM_GET_PRIVATE(o)  (DBUSMENU_MENUITEM(o)->priv)

/* Prototypes */
static void dbusmenu_menuitem_class_init (DbusmenuMenuitemClass *klass);
static void dbusmenu_menuitem_init       (DbusmenuMenuitem *self);
static void dbusmenu_menuitem_dispose    (GObject *object);
static void dbusmenu_menuitem_finalize   (GObject *object);
static void set_property (GObject * obj, guint id, const GValue * value, GParamSpec * pspec);
static void get_property (GObject * obj, guint id, GValue * value, GParamSpec * pspec);
static void g_value_transform_STRING_BOOLEAN (const GValue * in, GValue * out);
static void g_value_transform_STRING_INT (const GValue * in, GValue * out);
static void handle_event (DbusmenuMenuitem * mi, const gchar * name, GVariant * variant, guint timestamp);
static void send_about_to_show (DbusmenuMenuitem * mi, void (*cb) (DbusmenuMenuitem * mi, gpointer user_data), gpointer cb_data);

/* GObject stuff */
G_DEFINE_TYPE (DbusmenuMenuitem, dbusmenu_menuitem, G_TYPE_OBJECT);

static void
dbusmenu_menuitem_class_init (DbusmenuMenuitemClass *klass)
{
	GObjectClass *object_class = G_OBJECT_CLASS (klass);

	g_type_class_add_private (klass, sizeof (DbusmenuMenuitemPrivate));

	object_class->dispose = dbusmenu_menuitem_dispose;
	object_class->finalize = dbusmenu_menuitem_finalize;
	object_class->set_property = set_property;
	object_class->get_property = get_property;

	klass->handle_event = handle_event;
	klass->send_about_to_show = send_about_to_show;

	/**
		DbusmenuMenuitem::property-changed:
		@arg0: The #DbusmenuMenuitem object.
		@arg1: The name of the property that changed
		@arg2: The new value of the property

		Emitted everytime a property on a menuitem is either
		updated or added.
	*/
	signals[PROPERTY_CHANGED] =   g_signal_new(DBUSMENU_MENUITEM_SIGNAL_PROPERTY_CHANGED,
	                                           G_TYPE_FROM_CLASS(klass),
	                                           G_SIGNAL_RUN_LAST,
	                                           G_STRUCT_OFFSET(DbusmenuMenuitemClass, property_changed),
	                                           NULL, NULL,
	                                           _dbusmenu_menuitem_marshal_VOID__STRING_VARIANT,
	                                           G_TYPE_NONE, 2, G_TYPE_STRING, G_TYPE_VARIANT);
	/**
		DbusmenuMenuitem::item-activated:
		@arg0: The #DbusmenuMenuitem object.
		@arg1: The timestamp of when it was activated

		Emitted on the objects on the server side when
		they are signaled on the client side.
	*/
	signals[ITEM_ACTIVATED] =   g_signal_new(DBUSMENU_MENUITEM_SIGNAL_ITEM_ACTIVATED,
	                                           G_TYPE_FROM_CLASS(klass),
	                                           G_SIGNAL_RUN_LAST,
	                                           G_STRUCT_OFFSET(DbusmenuMenuitemClass, item_activated),
	                                           NULL, NULL,
	                                           _dbusmenu_menuitem_marshal_VOID__UINT,
	                                           G_TYPE_NONE, 1, G_TYPE_UINT, G_TYPE_NONE);
	/**
		DbusmenuMenuitem::child-added:
		@arg0: The #DbusmenuMenuitem which is the parent.
		@arg1: The #DbusmenuMenuitem which is the child.
		@arg2: The position that the child is being added in.

		Signaled when the child menuitem has been added to
		the parent.
	*/
	signals[CHILD_ADDED] =        g_signal_new(DBUSMENU_MENUITEM_SIGNAL_CHILD_ADDED,
	                                           G_TYPE_FROM_CLASS(klass),
	                                           G_SIGNAL_RUN_LAST,
	                                           G_STRUCT_OFFSET(DbusmenuMenuitemClass, child_added),
	                                           NULL, NULL,
	                                           _dbusmenu_menuitem_marshal_VOID__OBJECT_UINT,
	                                           G_TYPE_NONE, 2, G_TYPE_OBJECT, G_TYPE_UINT);
	/**
		DbusmenuMenuitem::child-removed:
		@arg0: The #DbusmenuMenuitem which was the parent.
		@arg1: The #DbusmenuMenuitem which was the child.

		Signaled when the child menuitem has been requested to
		be removed from the parent.  This signal is called when
		it has been removed from the list but not yet had
		#g_object_unref called on it.
	*/
	signals[CHILD_REMOVED] =      g_signal_new(DBUSMENU_MENUITEM_SIGNAL_CHILD_REMOVED,
	                                           G_TYPE_FROM_CLASS(klass),
	                                           G_SIGNAL_RUN_LAST,
	                                           G_STRUCT_OFFSET(DbusmenuMenuitemClass, child_removed),
	                                           NULL, NULL,
	                                           _dbusmenu_menuitem_marshal_VOID__OBJECT,
	                                           G_TYPE_NONE, 1, G_TYPE_OBJECT);
	/**
		DbusmenuMenuitem::child-moved:
		@arg0: The #DbusmenuMenuitem which is the parent.
		@arg1: The #DbusmenuMenuitem which is the child.
		@arg2: The position that the child is being moved to.
		@arg3: The position that the child is was in.

		Signaled when the child menuitem has had its location
		in the list change.
	*/
	signals[CHILD_MOVED] =        g_signal_new(DBUSMENU_MENUITEM_SIGNAL_CHILD_MOVED,
	                                           G_TYPE_FROM_CLASS(klass),
	                                           G_SIGNAL_RUN_LAST,
	                                           G_STRUCT_OFFSET(DbusmenuMenuitemClass, child_moved),
	                                           NULL, NULL,
	                                           _dbusmenu_menuitem_marshal_VOID__OBJECT_UINT_UINT,
	                                           G_TYPE_NONE, 3, G_TYPE_OBJECT, G_TYPE_UINT, G_TYPE_UINT);
	/**
		DbusmenuMenuitem::realized:
		@arg0: The #DbusmenuMenuitem object.

		Emitted when the initial request for properties
		is complete on the item.  If there is a type
		handler configured for the "type" parameter
		that will be executed before this is signaled.
	*/
	signals[REALIZED] =           g_signal_new(DBUSMENU_MENUITEM_SIGNAL_REALIZED,
	                                           G_TYPE_FROM_CLASS(klass),
	                                           G_SIGNAL_RUN_LAST,
	                                           G_STRUCT_OFFSET(DbusmenuMenuitemClass, realized),
	                                           NULL, NULL,
	                                           _dbusmenu_menuitem_marshal_VOID__VOID,
	                                           G_TYPE_NONE, 0, G_TYPE_NONE);
	/**
		DbusmenuMenuitem::show-to-user:
		@arg0: The #DbusmenuMenuitem which should be shown.
		@arg1: Timestamp the event happened at

		Signaled when the application would like the visualization
		of this menu item shown to the user.  This usually requires
		going over the bus to get it done.
	*/
	signals[SHOW_TO_USER] =      g_signal_new(DBUSMENU_MENUITEM_SIGNAL_SHOW_TO_USER,
	                                           G_TYPE_FROM_CLASS(klass),
	                                           G_SIGNAL_RUN_LAST,
	                                           G_STRUCT_OFFSET(DbusmenuMenuitemClass, show_to_user),
	                                           NULL, NULL,
	                                           g_cclosure_marshal_VOID__UINT,
	                                           G_TYPE_NONE, 1, G_TYPE_UINT, G_TYPE_NONE);

	/**
		DbusmenuMenuitem::about-to-show:
		@arg0: The #DbusmenuMenuitem object.

		Emitted when the submenu for this item
		is about to be shown
	*/
	signals[ABOUT_TO_SHOW] =     g_signal_new(DBUSMENU_MENUITEM_SIGNAL_ABOUT_TO_SHOW,
	                                          G_TYPE_FROM_CLASS(klass),
	                                          G_SIGNAL_RUN_LAST,
	                                          G_STRUCT_OFFSET(DbusmenuMenuitemClass, about_to_show),
	                                          NULL, NULL,
	                                          _dbusmenu_menuitem_marshal_VOID__VOID,
	                                          G_TYPE_BOOLEAN, 0, G_TYPE_NONE);
	/**
		DbusmenuMenuitem::event:
		@arg0: The #DbusmenuMenuitem object.
		@arg1: Name of the event
		@arg2: Information passed along with the event
		@arg3: X11 timestamp of when the event happened

		Emitted when an event is passed through.  The event is signalled
		after handle_event is called.
	*/
	signals[EVENT] =             g_signal_new(DBUSMENU_MENUITEM_SIGNAL_EVENT,
	                                          G_TYPE_FROM_CLASS(klass),
	                                          G_SIGNAL_RUN_LAST | G_SIGNAL_DETAILED,
	                                          G_STRUCT_OFFSET(DbusmenuMenuitemClass, event),
	                                          g_signal_accumulator_true_handled, NULL,
	                                          _dbusmenu_menuitem_marshal_BOOLEAN__STRING_VARIANT_UINT,
	                                          G_TYPE_BOOLEAN, 3, G_TYPE_STRING, G_TYPE_VARIANT, G_TYPE_UINT);

	g_object_class_install_property (object_class, PROP_ID,
	                                 g_param_spec_int(PROP_ID_S, "ID for the menu item",
	                                              "This is a unique indentifier for the menu item.",
												  -1, G_MAXINT, -1,
	                                              G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));

	/* Check transfer functions for GValue */
	if (!g_value_type_transformable(G_TYPE_STRING, G_TYPE_BOOLEAN)) {
		g_value_register_transform_func(G_TYPE_STRING, G_TYPE_BOOLEAN, g_value_transform_STRING_BOOLEAN);
	}
	if (!g_value_type_transformable(G_TYPE_STRING, G_TYPE_INT)) {
		g_value_register_transform_func(G_TYPE_STRING, G_TYPE_INT, g_value_transform_STRING_INT);
	}

	return;
}

/* A little helper function to translate a string into
   a boolean value */
static void
g_value_transform_STRING_BOOLEAN (const GValue * in, GValue * out)
{
	const gchar * string = g_value_get_string(in);
	if (!g_strcmp0(string, "TRUE") || !g_strcmp0(string, "true") || !g_strcmp0(string, "True")) {
		g_value_set_boolean(out, TRUE);
	} else {
		g_value_set_boolean(out, FALSE);
	}
	return;
}

/* A little helper function to translate a string into
   a integer value */
static void
g_value_transform_STRING_INT (const GValue * in, GValue * out)
{
	g_value_set_int(out, atoi(g_value_get_string(in)));
	return;
}

static gint menuitem_next_id = 1;

/* Make the unref function match the prototype need for the
   hashtable destructor */
static void
_g_variant_unref (gpointer data)
{
	g_variant_unref((GVariant *)data);
	return;
}

/* Initialize the values of the in the object, and build the
   properties hash table. */
static void
dbusmenu_menuitem_init (DbusmenuMenuitem *self)
{
	self->priv = (DbusmenuMenuitemPrivate*) g_type_instance_get_private ((GTypeInstance*) (self), (DBUSMENU_TYPE_MENUITEM));

	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(self);

	priv->id = -1; 
	priv->children = NULL;

	priv->properties = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, _g_variant_unref);

	priv->root = FALSE;
	priv->realized = FALSE;

	priv->defaults = dbusmenu_defaults_ref_default();
	priv->exposed = FALSE;
	
	return;
}

static void
dbusmenu_menuitem_dispose (GObject *object)
{
	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(object);

	GList * child = NULL;
	for (child = priv->children; child != NULL; child = g_list_next(child)) {
		g_object_unref(G_OBJECT(child->data));
	}
	g_list_free(priv->children);
	priv->children = NULL;

	if (priv->defaults != NULL) {
		g_object_unref(priv->defaults);
		priv->defaults = NULL;
	}

	if (priv->parent) {
		g_object_remove_weak_pointer(G_OBJECT(priv->parent), (gpointer *)&priv->parent);
		priv->parent = NULL;
	}

	G_OBJECT_CLASS (dbusmenu_menuitem_parent_class)->dispose (object);
	return;
}

static void
dbusmenu_menuitem_finalize (GObject *object)
{
	/* g_debug("Menuitem dying"); */
	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(object);

	if (priv->properties != NULL) {
		g_hash_table_destroy(priv->properties);
		priv->properties = NULL;
	}

	G_OBJECT_CLASS (dbusmenu_menuitem_parent_class)->finalize (object);
	return;
}

static void
set_property (GObject * obj, guint id, const GValue * value, GParamSpec * pspec)
{
	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(obj);

	switch (id) {
	case PROP_ID:
		priv->id = g_value_get_int(value);
		if (priv->id > menuitem_next_id) {
			if (priv->id == G_MAXINT) {
				menuitem_next_id = 1;
			} else {
				menuitem_next_id = priv->id + 1;
			}
		}
		break;
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID(obj, id, pspec);
		break;
	}

	return;
}

static void
get_property (GObject * obj, guint id, GValue * value, GParamSpec * pspec)
{
	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(obj);

	switch (id) {
	case PROP_ID:
		if (priv->id == -1) {
			priv->id = menuitem_next_id;
			if (menuitem_next_id == G_MAXINT) {
				menuitem_next_id = 1;
			} else {
				menuitem_next_id += 1;
			}
		}
		if (dbusmenu_menuitem_get_root(DBUSMENU_MENUITEM(obj))) {
			g_value_set_int(value, 0);
		} else {
			g_value_set_int(value, priv->id);
		}
		break;
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID(obj, id, pspec);
		break;
	}

	return;
}

/* Handles the activate event if it is sent. */
static void
handle_event (DbusmenuMenuitem * mi, const gchar * name, GVariant * value, guint timestamp)
{
	if (g_strcmp0(name, DBUSMENU_MENUITEM_EVENT_ACTIVATED) == 0) {
		g_signal_emit(G_OBJECT(mi), signals[ITEM_ACTIVATED], 0, timestamp, TRUE);
	}

	return;
}

/* Handles our about to show signal on items that submenus
   exist.  This is sending just activate now, but we should
   probably consider a special signal in the future if GTK
   gets more sophisticated about this. */
static void
send_about_to_show (DbusmenuMenuitem * mi, void (*cb) (DbusmenuMenuitem * mi, gpointer user_data), gpointer cb_data)
{
	g_return_if_fail(DBUSMENU_IS_MENUITEM(mi));

	if (dbusmenu_menuitem_get_children(mi) == NULL && g_strcmp0(DBUSMENU_MENUITEM_CHILD_DISPLAY_SUBMENU, dbusmenu_menuitem_property_get(mi, DBUSMENU_MENUITEM_PROP_CHILD_DISPLAY)) != 0) {
		g_warning("About to Show called on an item wihtout submenus.  We're ignoring it.");
	} else {
		gboolean dummy;
		g_signal_emit(G_OBJECT(mi), signals[ABOUT_TO_SHOW], 0, &dummy);
	}

	if (cb != NULL) {
		cb(mi, cb_data);
	}

	return;
}

/* A helper function to get the type of the menuitem, this might
   be a candidate for optimization in the future. */
static const gchar *
menuitem_get_type (const DbusmenuMenuitem * mi)
{
	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);
	GVariant * currentval = (GVariant *)g_hash_table_lookup(priv->properties, DBUSMENU_MENUITEM_PROP_TYPE);
	if (currentval != NULL) {
		return g_variant_get_string(currentval, NULL);
	}
	return NULL;
}

/* Public interface */

/**
 * dbusmenu_menuitem_new:
 * 
 * Create a new #DbusmenuMenuitem with all default values.
 * 
 * Return value: A newly allocated #DbusmenuMenuitem.
 */
DbusmenuMenuitem *
dbusmenu_menuitem_new (void)
{
	return g_object_new(DBUSMENU_TYPE_MENUITEM, NULL);
}

/**
 * dbusmenu_menuitem_new_with_id:
 * @id: ID to use for this menuitem
 * 
 * This creates a blank #DbusmenuMenuitem with a specific ID.
 * 
 * Return value: A newly allocated #DbusmenuMenuitem.
 */
DbusmenuMenuitem *
dbusmenu_menuitem_new_with_id (gint id)
{
	DbusmenuMenuitem * mi = g_object_new(DBUSMENU_TYPE_MENUITEM, PROP_ID_S, id, NULL);
	/* g_debug("New Menuitem id %d goal id %d", dbusmenu_menuitem_get_id(mi), id); */
	return mi;
}

/**
 * dbusmenu_menuitem_get_id:
 * @mi: The #DbusmenuMenuitem to query.
 * 
 * Gets the unique ID for @mi.
 * 
 * Return value: The ID of the @mi.
 */
gint
dbusmenu_menuitem_get_id (DbusmenuMenuitem * mi)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), -1);

	GValue retval = {0};
	g_value_init(&retval, G_TYPE_INT);
	g_object_get_property(G_OBJECT(mi), PROP_ID_S, &retval);
	gint ret = g_value_get_int(&retval);
	#ifdef MASSIVEDEBUGGING
	g_debug("Getting menuitem ID: %d", ret);
	#endif
	return ret;
}

/**
 * dbusmenu_menuitem_realized:
 * @mi: #DbusmenuMenuitem to check on
 * 
 * This function returns whether the menuitem has been realized or
 * not.  This is significant mostly in client implementations that
 * can use this additional state to see if the second layers of
 * the implementation have been built yet.
 * 
 * Return value: Returns whether or not the menu item has been realized
 * 	yet or not.
 */
gboolean
dbusmenu_menuitem_realized (DbusmenuMenuitem * mi)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), FALSE);
	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);
	return priv->realized;
}

/**
 * dbusmenu_menuitem_set_realized:
 * @mi: #DbusmenuMenuitem to realize
 * 
 * Sets the internal variable tracking whether it's been realized and
 * signals the DbusmenuMenuitem::realized event.
 */
void
dbusmenu_menuitem_set_realized (DbusmenuMenuitem * mi)
{
	g_return_if_fail(DBUSMENU_IS_MENUITEM(mi));
	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);
	if (priv->realized) {
		g_warning("Realized entry realized again?  ID: %d", dbusmenu_menuitem_get_id(mi));
	}
	priv->realized = TRUE;
	g_signal_emit(G_OBJECT(mi), signals[REALIZED], 0, TRUE);
	return;
}

/**
 * dbusmenu_menuitem_get_children:
 * @mi: The #DbusmenuMenuitem to query.
 * 
 * Returns simply the list of children that this menu item
 * has.  The list is valid until another child related function
 * is called, where it might be changed.
 * 
 * Return value: (transfer none) (element-type Dbusmenu.Menuitem): A #GList of pointers to #DbusmenuMenuitem objects.
 */
GList *
dbusmenu_menuitem_get_children (DbusmenuMenuitem * mi)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), NULL);

	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);
	return priv->children;
}

/* For all the taken children we need to signal
   that they were removed */
static void
take_children_helper (gpointer data, gpointer user_data)
{
	#ifdef MASSIVEDEBUGGING
	g_debug("Menuitem %d (%s) signalling child removed %d (%s)", ID(user_data), LABEL(user_data), ID(data), LABEL(data));
	#endif
	dbusmenu_menuitem_unparent(DBUSMENU_MENUITEM(data));
	g_signal_emit(G_OBJECT(user_data), signals[CHILD_REMOVED], 0, DBUSMENU_MENUITEM(data), TRUE);
	return;
}

/**
 * dbusmenu_menuitem_take_children:
 * @mi: The #DbusmenMenuitem to take the children from.
 * 
 * While the name sounds devious that's exactly what this function
 * does.  It takes the list of children from the @mi and clears the
 * internal list.  The calling function is now in charge of the ref's
 * on the children it has taken.  A lot of responsibility involved
 * in taking children.
 * 
 * Return value: (transfer full) (element-type Dbusmenu.Menuitem):
 *    A #GList of pointers to #DbusmenuMenuitem objects.
 */
GList *
dbusmenu_menuitem_take_children (DbusmenuMenuitem * mi)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), NULL);

	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);
	GList * children = priv->children;
	priv->children = NULL;
	g_list_foreach(children, take_children_helper, mi);

	dbusmenu_menuitem_property_remove(mi, DBUSMENU_MENUITEM_PROP_CHILD_DISPLAY);
	
	return children;
}

/**
 * dbusmenu_menuitem_get_position:
 * @mi: The #DbusmenuMenuitem to find the position of
 * @parent: The #DbusmenuMenuitem who's children contain @mi
 * 
 * This function returns the position of the menu item @mi
 * in the children of @parent.  It will return zero if the
 * menu item can't be found.
 * 
 * Return value: The position of @mi in the children of @parent.
 */
guint
dbusmenu_menuitem_get_position (DbusmenuMenuitem * mi, DbusmenuMenuitem * parent)
{
	#ifdef MASSIVEDEBUGGING
	if (!DBUSMENU_IS_MENUITEM(mi))     g_warning("Getting position of %d (%s), it's at: %d (mi fail)", ID(mi), LABEL(mi), 0);
	if (!DBUSMENU_IS_MENUITEM(parent)) g_warning("Getting position of %d (%s), it's at: %d (parent fail)", ID(mi), LABEL(mi), 0);
	#endif

	/* TODO: I'm not too happy returning zeros here.  But that's all I've got */
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), 0);
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(parent), 0);

	GList * childs = dbusmenu_menuitem_get_children(parent);
	if (childs == NULL) return 0;
	guint count = 0;
	for ( ; childs != NULL; childs = childs->next, count++) {
		if (childs->data == mi) break;
	}

	if (childs == NULL) return 0;

	#ifdef MASSIVEDEBUGGING
	g_debug("Getting position of %d (%s), it's at: %d", ID(mi), LABEL(mi), count);
	#endif

	return count;
}

/**
 * dbusmenu_menuitem_get_position_realized:
 * @mi: The #DbusmenuMenuitem to find the position of
 * @parent: The #DbusmenuMenuitem who's children contain @mi
 * 
 * This function is very similar to #dbusmenu_menuitem_get_position
 * except that it only counts in the children that have been realized.
 * 
 * Return value: The position of @mi in the realized children of @parent.
 */
guint
dbusmenu_menuitem_get_position_realized (DbusmenuMenuitem * mi, DbusmenuMenuitem * parent)
{
	#ifdef MASSIVEDEBUGGING
	if (!DBUSMENU_IS_MENUITEM(mi))     g_warning("Getting position of %d (%s), it's at: %d (mi fail)", ID(mi), LABEL(mi), 0);
	if (!DBUSMENU_IS_MENUITEM(parent)) g_warning("Getting position of %d (%s), it's at: %d (parent fail)", ID(mi), LABEL(mi), 0);
	#endif

	/* TODO: I'm not too happy returning zeros here.  But that's all I've got */
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), 0);
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(parent), 0);

	GList * childs = dbusmenu_menuitem_get_children(parent);
	if (childs == NULL) return 0;
	guint count = 0;
	for ( ; childs != NULL; childs = childs->next, count++) {
		if (!dbusmenu_menuitem_realized(DBUSMENU_MENUITEM(childs->data))) {
			count--;
			continue;
		}
		if (childs->data == mi) {
			break;
		}
	}

	if (childs == NULL) return 0;

	#ifdef MASSIVEDEBUGGING
	g_debug("Getting position of %d (%s), it's at: %d", ID(mi), LABEL(mi), count);
	#endif

	return count;
}

/**
 * dbusmenu_menuitem_child_append:
 * @mi: The #DbusmenuMenuitem which will become a new parent
 * @child: The #DbusmenMenuitem that will be a child
 * 
 * This function adds @child to the list of children on @mi at
 * the end of that list.
 * 
 * Return value: Whether the child has been added successfully.
 */
gboolean
dbusmenu_menuitem_child_append (DbusmenuMenuitem * mi, DbusmenuMenuitem * child)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), FALSE);
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(child), FALSE);

	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);
	g_return_val_if_fail(g_list_find(priv->children, child) == NULL, FALSE);

	if (!dbusmenu_menuitem_set_parent(child, mi)) {
		return FALSE;
	}

	if (priv->children == NULL && !dbusmenu_menuitem_property_exist(mi, DBUSMENU_MENUITEM_PROP_CHILD_DISPLAY)) {
		dbusmenu_menuitem_property_set(mi, DBUSMENU_MENUITEM_PROP_CHILD_DISPLAY, DBUSMENU_MENUITEM_CHILD_DISPLAY_SUBMENU);
	}

	priv->children = g_list_append(priv->children, child);
	#ifdef MASSIVEDEBUGGING
	g_debug("Menuitem %d (%s) signalling child added %d (%s) at %d", ID(mi), LABEL(mi), ID(child), LABEL(child), g_list_length(priv->children) - 1);
	#endif
	g_object_ref(G_OBJECT(child));
	g_signal_emit(G_OBJECT(mi), signals[CHILD_ADDED], 0, child, g_list_length(priv->children) - 1, TRUE);
	return TRUE;
}

/**
 * dbusmenu_menuitem_child_prepend:
 * @mi: The #DbusmenuMenuitem which will become a new parent
 * @child: The #DbusmenMenuitem that will be a child
 * 
 * This function adds @child to the list of children on @mi at
 * the beginning of that list.
 * 
 * Return value: Whether the child has been added successfully.
 */
gboolean
dbusmenu_menuitem_child_prepend (DbusmenuMenuitem * mi, DbusmenuMenuitem * child)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), FALSE);
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(child), FALSE);

	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);
	g_return_val_if_fail(g_list_find(priv->children, child) == NULL, FALSE);

	if (!dbusmenu_menuitem_set_parent(child, mi)) {
		return FALSE;
	}

	if (priv->children == NULL && !dbusmenu_menuitem_property_exist(mi, DBUSMENU_MENUITEM_PROP_CHILD_DISPLAY)) {
		dbusmenu_menuitem_property_set(mi, DBUSMENU_MENUITEM_PROP_CHILD_DISPLAY, DBUSMENU_MENUITEM_CHILD_DISPLAY_SUBMENU);
	}

	priv->children = g_list_prepend(priv->children, child);
	#ifdef MASSIVEDEBUGGING
	g_debug("Menuitem %d (%s) signalling child added %d (%s) at %d", ID(mi), LABEL(mi), ID(child), LABEL(child), 0);
	#endif
	g_object_ref(G_OBJECT(child));
	g_signal_emit(G_OBJECT(mi), signals[CHILD_ADDED], 0, child, 0, TRUE);
	return TRUE;
}

/**
 * dbusmenu_menuitem_child_delete:
 * @mi: The #DbusmenuMenuitem which has @child as a child
 * @child: The child #DbusmenuMenuitem that you want to no longer
 *     be a child of @mi.
 * 
 * This function removes @child from the children list of @mi.  It does
 * not call #g_object_unref on @child.
 * 
 * Return value: If we were able to delete @child.
 */
gboolean
dbusmenu_menuitem_child_delete (DbusmenuMenuitem * mi, DbusmenuMenuitem * child)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), FALSE);
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(child), FALSE);

	if (dbusmenu_menuitem_get_parent(child) != mi) {
		g_warning("Trying to remove a child that doesn't believe we're its parent.");
		return FALSE;
	}

	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);
	priv->children = g_list_remove(priv->children, child);
	dbusmenu_menuitem_unparent(child);
	#ifdef MASSIVEDEBUGGING
	g_debug("Menuitem %d (%s) signalling child removed %d (%s)", ID(mi), LABEL(mi), ID(child), LABEL(child));
	#endif
	g_signal_emit(G_OBJECT(mi), signals[CHILD_REMOVED], 0, child, TRUE);
	g_object_unref(G_OBJECT(child));

	if (priv->children == NULL) {
		dbusmenu_menuitem_property_remove(mi, DBUSMENU_MENUITEM_PROP_CHILD_DISPLAY);
	}

	return TRUE;
}

/**
 * dbusmenu_menuitem_child_add_position:
 * @mi: The #DbusmenuMenuitem that we're adding the child @child to.
 * @child: The #DbusmenuMenuitem to make a child of @mi.
 * @position: Where in @mi object's list of chidren @child should be placed.
 * 
 * Puts @child in the list of children for @mi at the location
 * specified in @position.  If there is not enough entires available
 * then @child will be placed at the end of the list.
 * 
 * Return value: Whether @child was added successfully.
 */
gboolean
dbusmenu_menuitem_child_add_position (DbusmenuMenuitem * mi, DbusmenuMenuitem * child, guint position)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), FALSE);
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(child), FALSE);

	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);
	g_return_val_if_fail(g_list_find(priv->children, child) == NULL, FALSE);

	if (!dbusmenu_menuitem_set_parent(child, mi)) {
		return FALSE;
	}

	if (priv->children == NULL && !dbusmenu_menuitem_property_exist(mi, DBUSMENU_MENUITEM_PROP_CHILD_DISPLAY)) {
		dbusmenu_menuitem_property_set(mi, DBUSMENU_MENUITEM_PROP_CHILD_DISPLAY, DBUSMENU_MENUITEM_CHILD_DISPLAY_SUBMENU);
	}

	priv->children = g_list_insert(priv->children, child, position);
	#ifdef MASSIVEDEBUGGING
	g_debug("Menuitem %d (%s) signalling child added %d (%s) at %d", ID(mi), LABEL(mi), ID(child), LABEL(child), position);
	#endif
	g_object_ref(G_OBJECT(child));
	g_signal_emit(G_OBJECT(mi), signals[CHILD_ADDED], 0, child, position, TRUE);
	return TRUE;
}

/**
 * dbusmenu_menuitem_child_reorder:
 * @mi: The #DbusmenuMenuitem that has children needing realignment
 * @child: The #DbusmenuMenuitem that is a child needing to be moved
 * @position: The position in the list to place it in
 * 
 * This function moves a child on the list of children.  It is
 * for a child that is already in the list, but simply needs a 
 * new location.
 * 
 * Return value: Whether the move was successful.
 */
gboolean
dbusmenu_menuitem_child_reorder(DbusmenuMenuitem * mi, DbusmenuMenuitem * child, guint position)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), FALSE);
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(child), FALSE);

	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);
	gint oldpos = g_list_index(priv->children, child);

	if (oldpos == -1) {
		g_warning("Can not reorder child that isn't actually a child.");
		return FALSE;
	}
	if (oldpos == position) {
		return TRUE;
	}

	priv->children = g_list_remove(priv->children, child);
	priv->children = g_list_insert(priv->children, child, position);

	#ifdef MASSIVEDEBUGGING
	g_debug("Menuitem %d (%s) signalling child %d (%s) moved from %d to %d", ID(mi), LABEL(mi), ID(child), LABEL(child), oldpos, position);
	#endif
	g_signal_emit(G_OBJECT(mi), signals[CHILD_MOVED], 0, child, position, oldpos, TRUE);

	return TRUE;
}

/**
 * dbusmenu_menuitem_child_find:
 * @mi: The #DbusmenuMenuitem who's children to look on
 * @id: The ID of the child that we're looking for.
 * 
 * Search the children of @mi to find one with the ID of @id.
 * If it doesn't exist then we return #NULL.
 * 
 * Return value: (transfer none): The menu item with the ID @id or #NULL if it
 *    can't be found.
 */
DbusmenuMenuitem *
dbusmenu_menuitem_child_find (DbusmenuMenuitem * mi, gint id)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), NULL);

	GList * childs = dbusmenu_menuitem_get_children(mi);
	if (childs == NULL) return NULL;

	for ( ; childs == NULL; childs = g_list_next(childs)) {
		DbusmenuMenuitem * lmi = DBUSMENU_MENUITEM(childs->data);
		if (id == dbusmenu_menuitem_get_id(lmi)) {
			return lmi;
		}
	}

	return NULL;
}

typedef struct {
	DbusmenuMenuitem * mi;
	gint id;
} find_id_t;

/* Basically the heart of the find_id that matches the
   API of GFunc.  Unfortunately, this goes through all the
   children, but it rejects them quickly. */
static void
find_id_helper (gpointer in_mi, gpointer in_find_id)
{
	DbusmenuMenuitem * mi = (DbusmenuMenuitem *)in_mi;
	find_id_t * find_id = (find_id_t *)in_find_id;

	if (find_id->mi != NULL) return;
	if (find_id->id == dbusmenu_menuitem_get_id(mi)) {
		find_id->mi = mi;
		return;
	}

	g_list_foreach(dbusmenu_menuitem_get_children(mi), find_id_helper, in_find_id);
	return;
}

/**
 * dbusmenu_menuitem_find_id:
 * @mi: #DbusmenuMenuitem at the top of the tree to search
 * @id: ID of the #DbusmenuMenuitem to search for
 * 
 * This function searchs the whole tree of children that
 * are attached to @mi.  This could be quite a few nodes, all
 * the way down the tree.  It is a depth first search.
 * 
 * Return value: (transfer none): The #DbusmenuMenuitem with the ID of @id
 * 	or #NULL if there isn't such a menu item in the tree
 * 	represented by @mi.
 */
DbusmenuMenuitem *
dbusmenu_menuitem_find_id (DbusmenuMenuitem * mi, gint id)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), NULL);
	if (id == 0) {
		if (dbusmenu_menuitem_get_root(mi) == FALSE) {
			g_warning("Getting a menuitem with id zero, but it's not set as root.");
		}
		return mi;
	}
	find_id_t find_id = {.mi=NULL, .id=id};
	find_id_helper(mi, &find_id);
	return find_id.mi;
}

/**
 * dbusmenu_menuitem_set_parent:
 * @mi: The #DbusmenuMenuitem for which to set the parent
 * @parent: The new parent #DbusmenuMenuitem
 *
 * Sets the parent of @mi to @parent. If @mi already
 * has a parent, then this call will fail. The parent will
 * be set automatically when using the usual methods to add a
 * child menuitem, so this function should not normally be 
 * called directly 
 *
 * Return value: Whether the parent was set successfully
 */
gboolean
dbusmenu_menuitem_set_parent (DbusmenuMenuitem * mi, DbusmenuMenuitem * parent)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), FALSE);
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), FALSE);

	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);

	if (priv->parent != NULL) {
		g_warning ("Menu item already has a parent");
		return FALSE;
	}

	priv->parent = parent;
	g_object_add_weak_pointer(G_OBJECT(priv->parent), (gpointer *)&priv->parent);

	return TRUE;
}

/**
 * dbusmenu_menuitem_unparent:
 * @mi: The #DbusmenuMenuitem to unparent
 *
 * Unparents the menu item @mi. If @mi doesn't have a
 * parent, then this call will fail. The menuitem will
 * be unparented automatically when using the usual methods
 * to delete a child menuitem, so this function should not
 * normally be called directly 
 *
 * Return value: Whether the menu item was unparented successfully
 */
gboolean
dbusmenu_menuitem_unparent (DbusmenuMenuitem * mi)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), FALSE);
	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);

	if (priv->parent == NULL) {
		g_warning("Menu item doesn't have a parent");
		return FALSE;
	}

	g_object_remove_weak_pointer(G_OBJECT(priv->parent), (gpointer *)&priv->parent);
	priv->parent = NULL;

	return TRUE;
}

/**
 * dbusmenu_menuitem_get_parent:
 * @mi: The #DbusmenuMenuitem for which to inspect the parent
 *
 * This function looks up the parent of @mi
 *
 * Return value: (transfer none): The parent of this menu item
 */
DbusmenuMenuitem *
dbusmenu_menuitem_get_parent (DbusmenuMenuitem * mi)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), NULL);
	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);

	return priv->parent;
}

/**
 * dbusmenu_menuitem_property_set:
 * @mi: The #DbusmenuMenuitem to set the property on.
 * @property: Name of the property to set.
 * @value: The value of the property.
 * 
 * Takes the pair of @property and @value and places them as a
 * property on @mi.  If a property already exists by that name,
 * then the value is set to the new value.  If not, the property
 * is added.  If the value is changed or the property was previously
 * unset then the signal #DbusmenuMenuitem::prop-changed will be
 * emitted by this function.
 * 
 * Return value:  A boolean representing if the property value was set.
 */
gboolean
dbusmenu_menuitem_property_set (DbusmenuMenuitem * mi, const gchar * property, const gchar * value)
{
	GVariant * variant = NULL;
	if (value != NULL) {
		variant = g_variant_new_string(value);
	}
	return dbusmenu_menuitem_property_set_variant(mi, property, variant);
}

/**
 * dbusmenu_menuitem_property_set_bool:
 * @mi: The #DbusmenuMenuitem to set the property on.
 * @property: Name of the property to set.
 * @value: The value of the property.
 * 
 * Takes a boolean @value and sets it on @property as a
 * property on @mi.  If a property already exists by that name,
 * then the value is set to the new value.  If not, the property
 * is added.  If the value is changed or the property was previously
 * unset then the signal #DbusmenuMenuitem::prop-changed will be
 * emitted by this function.
 * 
 * Return value:  A boolean representing if the property value was set.
 */
gboolean
dbusmenu_menuitem_property_set_bool (DbusmenuMenuitem * mi, const gchar * property, const gboolean value)
{
	GVariant * variant = g_variant_new("b", value);
	return dbusmenu_menuitem_property_set_variant(mi, property, variant);
}

/**
 * dbusmenu_menuitem_property_set_int:
 * @mi: The #DbusmenuMenuitem to set the property on.
 * @property: Name of the property to set.
 * @value: The value of the property.
 * 
 * Takes a boolean @value and sets it on @property as a
 * property on @mi.  If a property already exists by that name,
 * then the value is set to the new value.  If not, the property
 * is added.  If the value is changed or the property was previously
 * unset then the signal #DbusmenuMenuitem::prop-changed will be
 * emitted by this function.
 * 
 * Return value:  A boolean representing if the property value was set.
 */
gboolean
dbusmenu_menuitem_property_set_int (DbusmenuMenuitem * mi, const gchar * property, const gint value)
{
	GVariant * variant = g_variant_new("i", value);
	return dbusmenu_menuitem_property_set_variant(mi, property, variant);
}

/**
 * dbusmenu_menuitem_property_set_byte_array:
 * @mi: The #DbusmenuMenuitem to set the property on.
 * @property: Name of the property to set.
 * @value: The byte array.
 * @nelements: The number of elements in the byte array.
 * 
 * Takes a byte array @value and sets it on @property as a
 * property on @mi.  If a property already exists by that name,
 * then the value is set to the new value.  If not, the property
 * is added.  If the value is changed or the property was previously
 * unset then the signal #DbusmenuMenuitem::prop-changed will be
 * emitted by this function.
 * 
 * Return value:  A boolean representing if the property value was set.
 */
gboolean
dbusmenu_menuitem_property_set_byte_array (DbusmenuMenuitem * mi, const gchar * property, const guchar * value, gsize nelements)
{
	GVariant * variant = NULL;
	if (value != NULL) {
		variant = g_variant_new_fixed_array(G_VARIANT_TYPE_BYTE, value, nelements, sizeof(guchar));
	}
	return dbusmenu_menuitem_property_set_variant(mi, property, variant);
}

/**
 * dbusmenu_menuitem_property_set_variant:
 * @mi: The #DbusmenuMenuitem to set the property on.
 * @property: Name of the property to set.
 * @value: The value of the property.
 * 
 * Takes the pair of @property and @value and places them as a
 * property on @mi.  If a property already exists by that name,
 * then the value is set to the new value.  If not, the property
 * is added.  If the value is changed or the property was previously
 * unset then the signal #DbusmenuMenuitem::prop-changed will be
 * emitted by this function.
 * 
 * Return value:  A boolean representing if the property value was set.
 */
gboolean
dbusmenu_menuitem_property_set_variant (DbusmenuMenuitem * mi, const gchar * property, GVariant * value)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), FALSE);
	g_return_val_if_fail(property != NULL, FALSE);
	g_return_val_if_fail(g_utf8_validate(property, -1, NULL), FALSE);

	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);
	GVariant * default_value = NULL;

	const gchar * type = menuitem_get_type(mi);

	if (value != NULL) {
		/* Check the expected type to see if we want to have a warning */
		GVariantType * default_type = dbusmenu_defaults_default_get_type(priv->defaults, type, property);
		if (default_type != NULL) {
			/* If we have an expected type we should check to see if
			   the value we've been given is of the same type and generate
			   a warning if it isn't */
			if (!g_variant_is_of_type(value, default_type)) {
				g_warning("Setting menuitem property '%s' with value of type '%s' when expecting '%s'", property, g_variant_get_type_string(value), g_variant_type_peek_string(default_type));
			}
		}
	}

	/* Check the defaults database to see if we have a default
	   for this property. */
	default_value = dbusmenu_defaults_default_get(priv->defaults, type, property);
	if (default_value != NULL && value != NULL) {
		/* Now see if we're setting this to the same value as the
		   default.  If we are then we just want to swallow this variant
		   and make the function behave like we're clearing it. */
		if (g_variant_equal(default_value, value)) {
			g_variant_ref_sink(value);
			g_variant_unref(value);
			value = NULL;
		}
	}

	gboolean replaced = FALSE;
	gboolean remove = FALSE;
	gchar * hash_key = NULL;
	GVariant * hash_variant = NULL;
	gboolean inhash = g_hash_table_lookup_extended(priv->properties, property, (gpointer *)&hash_key, (gpointer *)&hash_variant);

	if (inhash && hash_variant == NULL) {
		g_warning("The property '%s' is in the hash with a NULL variant", property);
		inhash = FALSE;
	}

	if (value != NULL) {
		/* NOTE: We're only marking this as replaced if this is true
		   but we're actually replacing it no matter.  This is so that
		   the variant passed in sticks around which the caller may
		   expect.  They shouldn't, but it's low cost to remove bugs. */
		if (!inhash || (hash_variant != NULL && !g_variant_equal(hash_variant, value))) {
			replaced = TRUE;
		}

		gchar * lprop = g_strdup(property);
		g_variant_ref_sink(value);

		/* Really important that this is _insert as that means the value
		   that we just created in the _strdup is free'd and not the one
		   currently in the hashtable.  That could be the same as the one
		   being passed in and then the signal emit would be done with a
		   bad value */
		g_hash_table_insert(priv->properties, lprop, value);
	} else {
		if (inhash) {
		/* So the question you should be asking if you're paying attention
		   is "Why not just do the remove here?"  It's a good question with
		   an interesting answer.  Bascially it's the same reason as above,
		   in a couple cases the passed in properties is the value in the hash
		   table so we can avoid strdup'ing it by removing it (and thus free'ing
		   it) after the signal emition */
			remove = TRUE;
			replaced = TRUE;
			g_hash_table_steal(priv->properties, property);
		}
	}

	/* NOTE: The actual value is invalid at this point
	   becuse it has been unref'd when replaced in the hash
	   table.  But the fact that there was a value is
	   the imporant part. */
	if (replaced) {
		GVariant * signalval = value;

		if (signalval == NULL) {
			/* Might also be NULL, but if it is we're definitely
			   clearing this thing. */
			signalval = default_value;
		}

		g_signal_emit(G_OBJECT(mi), signals[PROPERTY_CHANGED], 0, property, signalval, TRUE);
	}

	if (remove) {
		g_free(hash_key);
		g_variant_unref(hash_variant);
	}

	return TRUE;
}

/**
 * dbusmenu_menuitem_property_get:
 * @mi: The #DbusmenuMenuitem to look for the property on.
 * @property: The property to grab.
 * 
 * Look up a property on @mi and return the value of it if
 * it exits.  #NULL will be returned if the property doesn't
 * exist.
 * 
 * Return value: (transfer none): A string with the value of the property
 * 	that shouldn't be free'd.  Or #NULL if the property
 * 	is not set or is not a string.
 */
const gchar *
dbusmenu_menuitem_property_get (const DbusmenuMenuitem * mi, const gchar * property)
{
	GVariant * variant = dbusmenu_menuitem_property_get_variant(mi, property);
	if (variant == NULL) return NULL;
	if (!g_variant_type_equal(g_variant_get_type(variant), G_VARIANT_TYPE_STRING)) return NULL;
	return g_variant_get_string(variant, NULL);
}

/**
 * dbusmenu_menuitem_property_get_variant:
 * @mi: The #DbusmenuMenuitem to look for the property on.
 * @property: The property to grab.
 * 
 * Look up a property on @mi and return the value of it if
 * it exits.  #NULL will be returned if the property doesn't
 * exist.
 * 
 * Return value: (transfer none): A GVariant for the property.
 */
GVariant *
dbusmenu_menuitem_property_get_variant (const DbusmenuMenuitem * mi, const gchar * property)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), NULL);
	g_return_val_if_fail(property != NULL, NULL);

	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);

	GVariant * currentval = (GVariant *)g_hash_table_lookup(priv->properties, property);

	if (currentval == NULL) {
		currentval = dbusmenu_defaults_default_get(priv->defaults, menuitem_get_type(mi), property);
	}

	return currentval;
}

/**
 * dbusmenu_menuitem_property_get_bool:
 * @mi: The #DbusmenuMenuitem to look for the property on.
 * @property: The property to grab.
 * 
 * Look up a property on @mi and return the value of it if
 * it exits.  Returns #FALSE if the property doesn't exist.
 * 
 * Return value: The value of the property or #FALSE.
 */
gboolean
dbusmenu_menuitem_property_get_bool (const DbusmenuMenuitem * mi, const gchar * property)
{
	GVariant * variant = dbusmenu_menuitem_property_get_variant(mi, property);
	if (variant == NULL) return FALSE;

	if (g_variant_type_equal(g_variant_get_type(variant), G_VARIANT_TYPE_BOOLEAN)) {
		return g_variant_get_boolean(variant);
	}

	if (g_variant_type_equal(g_variant_get_type(variant), G_VARIANT_TYPE_STRING)) {
		const gchar * string = g_variant_get_string(variant, NULL);

		if (!g_strcmp0(string, "TRUE") || !g_strcmp0(string, "true") || !g_strcmp0(string, "True")) {
			return TRUE;
		} else {
			return FALSE;
		}
	}

	g_warning("Property '%s' has been requested as an boolean but is not one.", property);
	return FALSE;
}

/**
 * dbusmenu_menuitem_property_get_int:
 * @mi: The #DbusmenuMenuitem to look for the property on.
 * @property: The property to grab.
 * 
 * Look up a property on @mi and return the value of it if
 * it exits.  Returns zero if the property doesn't exist.
 * 
 * Return value: The value of the property or zero.
 */
gint
dbusmenu_menuitem_property_get_int (const DbusmenuMenuitem * mi, const gchar * property)
{
	GVariant * variant = dbusmenu_menuitem_property_get_variant(mi, property);
	if (variant == NULL) return 0;

	if (g_variant_type_equal(g_variant_get_type(variant), G_VARIANT_TYPE_INT32)) {
		return g_variant_get_int32(variant);
	}

	if (g_variant_type_equal(g_variant_get_type(variant), G_VARIANT_TYPE_STRING)) {
		const gchar * string = g_variant_get_string(variant, NULL);
		return atoi(string);
	}

	g_warning("Property '%s' has been requested as an int but is not one.", property);
	return 0;
}

/**
 * dbusmenu_menuitem_property_get_byte_array:
 * @mi: The #DbusmenuMenuitem to look for the property on.
 * @property: The property to grab.
 * @nelements: A pointer to the location to store the number of items (out)
 * 
 * Look up a property on @mi and return the value of it if
 * it exits.  #NULL will be returned if the property doesn't
 * exist.
 * 
 * Return value: (array length=nelements)(element-type guint8)(transfer none): A byte array with the
 * 	value of the property that shouldn't be free'd.  Or #NULL if the property
 * 	is not set or is not a byte array.
 */
const guchar *
dbusmenu_menuitem_property_get_byte_array (const DbusmenuMenuitem * mi, const gchar * property, gsize * nelements)
{
	GVariant * variant = dbusmenu_menuitem_property_get_variant(mi, property);
	if (variant == NULL) {
		*nelements = 0;
		return NULL;
	}
	if (!g_variant_type_equal(g_variant_get_type(variant), G_VARIANT_TYPE("ay"))) return NULL;
	return g_variant_get_fixed_array(variant, nelements, sizeof(guchar));
}

/**
 * dbusmenu_menuitem_property_exist:
 * @mi: The #DbusmenuMenuitem to look for the property on.
 * @property: The property to look for.
 * 
 * Checkes to see if a particular property exists on @mi and 
 * returns #TRUE if so.
 * 
 * Return value: A boolean checking to see if the property is available
 */
gboolean
dbusmenu_menuitem_property_exist (const DbusmenuMenuitem * mi, const gchar * property)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), FALSE);
	g_return_val_if_fail(property != NULL, FALSE);

	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);

	gpointer value = g_hash_table_lookup(priv->properties, property);

	return value != NULL;
}

/**
 * dbusmenu_menuitem_property_remove:
 * @mi: The #DbusmenuMenuitem to remove the property on.
 * @property: The property to look for.
 * 
 * Removes a property from the menuitem.
 */
void
dbusmenu_menuitem_property_remove (DbusmenuMenuitem * mi, const gchar * property)
{
	g_return_if_fail(DBUSMENU_IS_MENUITEM(mi));
	g_return_if_fail(property != NULL);

	dbusmenu_menuitem_property_set_variant(mi, property, NULL);

	return;
}

/**
 * dbusmenu_menuitem_properties_list:
 * @mi: #DbusmenuMenuitem to list the properties on
 * 
 * This functiong gets a list of the names of all the properties
 * that are set on this menu item.  This data on the list is owned
 * by the menuitem but the list is not and should be freed using
 * g_list_free() when the calling function is done with it.
 * 
 * Return value: (transfer container) (element-type utf8): A list of
 * strings or NULL if there are none.
*/
GList *
dbusmenu_menuitem_properties_list (DbusmenuMenuitem * mi)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), NULL);

	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);
	return g_hash_table_get_keys(priv->properties);
}

/* Copy the keys and make references to the variants that are
   in the new table.  They'll be free'd and unref'd when the
   Hashtable gets destroyed. */
static void
copy_helper (gpointer in_key, gpointer in_value, gpointer in_data)
{
	GHashTable * table = (GHashTable *)in_data;
	gchar * key = (gchar *)in_key;
	GVariant * value = (GVariant *)in_value;
	g_variant_ref_sink(value);
	g_hash_table_insert(table, g_strdup(key), value);
	return;
}

/**
 * dbusmenu_menuitem_properties_copy:
 * @mi: #DbusmenuMenuitem that we're interested in the properties of
 * 
 * This function takes the properties of a #DbusmenuMenuitem
 * and puts them into a #GHashTable that is referenced by the
 * key of a string and has the value of a string.  The hash
 * table may not have any entries if there aren't any or there
 * is an error in processing.  It is the caller's responsibility
 * to destroy the created #GHashTable.
 * 
 * Return value: (transfer full): A brand new #GHashTable that contains all of
 *    theroperties that are on this #DbusmenuMenuitem @mi.
*/
GHashTable *
dbusmenu_menuitem_properties_copy (DbusmenuMenuitem * mi)
{
	GHashTable * ret = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, _g_variant_unref);

	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), ret);

	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);
	g_hash_table_foreach(priv->properties, copy_helper, ret);

	return ret;
}

/* Looks at each value in the hashtable and tries to convert it
   into a variant and add it to our variant builder */
static void
variant_helper (gpointer in_key, gpointer in_value, gpointer user_data)
{
	GVariant * value = g_variant_new_dict_entry(g_variant_new_string((gchar *)in_key),
	                                            g_variant_new_variant((GVariant *)in_value));
	g_variant_builder_add_value((GVariantBuilder *)user_data, value);
	return;
}

/**
 * dbusmenu_menuitem_properties_variant:
 * @mi: #DbusmenuMenuitem to get properties from
 * 
 * Grabs the properties of the menuitem as a GVariant with the
 * type "a{sv}".
 * 
 * Return Value: (transfer full): A GVariant of type "a{sv}" or NULL on error.
 */
GVariant *
dbusmenu_menuitem_properties_variant (DbusmenuMenuitem * mi, const gchar ** properties)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), NULL);

	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);

	GVariant * final_variant = NULL;

	if ((properties == NULL || properties[0] == NULL) && g_hash_table_size(priv->properties) > 0) {
		GVariantBuilder builder;
		g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);

		g_hash_table_foreach(priv->properties, variant_helper, &builder);

		final_variant = g_variant_builder_end(&builder);
	}

	if (properties != NULL) {
		GVariantBuilder builder;
		gboolean builder_init = FALSE;
		int i = 0; const gchar * prop;

		for (prop = properties[i]; prop != NULL; prop = properties[++i]) {
			GVariant * propvalue = dbusmenu_menuitem_property_get_variant(mi, prop);

			if (propvalue == NULL) {
				continue;
			}

			if (!builder_init) {
				builder_init = TRUE;
				g_variant_builder_init(&builder, G_VARIANT_TYPE_ARRAY);
			}

			GVariant * dict = g_variant_new_dict_entry(g_variant_new_string((gchar *)prop),
			                                           g_variant_new_variant((GVariant *)propvalue));
			g_variant_builder_add_value(&builder, dict);
		}

		if (builder_init) {
			final_variant = g_variant_builder_end(&builder);
		}
	}

	return final_variant;
}

/**
 * dbusmenu_menuitem_set_root:
 * @mi: #DbusmenuMenuitem to set whether it's root
 * @root: Whether @mi is a root node or not
 * 
 * This function sets the internal value of whether this is a
 * root node or not.
 */
void
dbusmenu_menuitem_set_root (DbusmenuMenuitem * mi, gboolean root)
{
	g_return_if_fail(DBUSMENU_IS_MENUITEM(mi));
	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);
	priv->root = root;
	return;
}

/**
 * dbusmenu_menuitem_get_root:
 * @mi: #DbusmenuMenuitem to see whether it's root
 * 
 * This function returns the internal value of whether this is a
 * root node or not.
 * 
 * Return value: #TRUE if this is a root node
 */
gboolean
dbusmenu_menuitem_get_root (DbusmenuMenuitem * mi)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), FALSE);
	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);
	return priv->root;
}


/**
 * dbusmenu_menuitem_buildvariant:
 * @mi: #DbusmenuMenuitem to represent in a variant
 * @properties: (element-type utf8): A list of string that will be put into
 *      a variant
 * 
 * This function will put at least one entry if this menu item has no children.
 * If it has children it will put two for this entry, one representing the
 * start tag and one that is a closing tag.  It will allow its
 * children to place their own tags in the array in between those two.
 *
 * Return value: (transfer full): Variant representing @properties
*/
GVariant *
dbusmenu_menuitem_build_variant (DbusmenuMenuitem * mi, const gchar ** properties, gint recurse)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), NULL);
	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);
	priv->exposed = TRUE;

	gint id = 0;
	if (!dbusmenu_menuitem_get_root(mi)) {
		id = dbusmenu_menuitem_get_id(mi);
	}

	/* This is the tuple that'll build up being a representation of
	   this entry */
	GVariantBuilder tupleb;
	g_variant_builder_init(&tupleb, G_VARIANT_TYPE_TUPLE);

	/* Add our ID */
	g_variant_builder_add_value(&tupleb, g_variant_new_int32(id));

	/* Figure out the properties */
	GVariant * props = dbusmenu_menuitem_properties_variant(mi, properties);
	if (props != NULL) {
		g_variant_builder_add_value(&tupleb, props);
	} else {
		GVariant *empty_props = g_variant_parse(G_VARIANT_TYPE("a{sv}"), "[ ]", NULL, NULL, NULL);
		g_variant_builder_add_value(&tupleb, empty_props);
		g_variant_unref(empty_props);
	}

	/* Pillage the children */
	GList * children = dbusmenu_menuitem_get_children(mi);
	if (children == NULL || recurse == 0) {
		g_variant_builder_add_value(&tupleb, g_variant_new_array(G_VARIANT_TYPE_VARIANT, NULL, 0));
	} else {
		GVariantBuilder childrenbuilder;
		g_variant_builder_init(&childrenbuilder, G_VARIANT_TYPE_ARRAY);

		for ( ; children != NULL; children = children->next) {
			GVariant * child = dbusmenu_menuitem_build_variant(DBUSMENU_MENUITEM(children->data), properties, recurse - 1);

			g_variant_builder_add_value(&childrenbuilder, g_variant_new_variant(child));
		}

		g_variant_builder_add_value(&tupleb, g_variant_builder_end(&childrenbuilder));
	}

	return g_variant_builder_end(&tupleb);
}

typedef struct {
	void (*func) (DbusmenuMenuitem * mi, gpointer data);
	gpointer data;
} foreach_struct_t;

static void
foreach_helper (gpointer data, gpointer user_data)
{
	dbusmenu_menuitem_foreach(DBUSMENU_MENUITEM(data), ((foreach_struct_t *)user_data)->func, ((foreach_struct_t *)user_data)->data);
	return;
}

/**
 * dbusmenu_menuitem_foreach:
 * @mi: The #DbusmenItem to start from
 * @func: Function to call on every node in the tree
 * @data: (closure): User data to pass to the function
 * 
 * This calls the function @func on this menu item and all
 * of the children of this item.  And their children.  And
 * their children.  And... you get the point.  It will get
 * called on the whole tree.
*/
void
dbusmenu_menuitem_foreach (DbusmenuMenuitem * mi, void (*func) (DbusmenuMenuitem * mi, gpointer data), gpointer data)
{
	g_return_if_fail(DBUSMENU_IS_MENUITEM(mi));
	g_return_if_fail(func != NULL);

	func(mi, data);
	GList * children = dbusmenu_menuitem_get_children(mi);
	foreach_struct_t foreach_data = {.func=func, .data=data};
	g_list_foreach(children, foreach_helper, &foreach_data);
	return;
}

/**
 * dbusmenu_menuitem_handle_event:
 * @mi: The #DbusmenuMenuitem to send the signal on.
 * @name: The name of the signal
 * @variant: A value that could be set for the event
 * @timestamp: The timestamp of when the event happened
 * 
 * This function is called to create an event.  It is likely
 * to be overrided by subclasses.  The default menu item
 * will respond to the activate signal and do:
 * 
 * Emits the #DbusmenuMenuitem::item-activate signal on this
 * menu item.  Called by server objects when they get the
 * appropriate DBus signals from the client.
 * 
 * If you subclass this function you should really think
 * about calling the parent function unless you have a good
 * reason not to.
*/
void
dbusmenu_menuitem_handle_event (DbusmenuMenuitem * mi, const gchar * name, GVariant * variant, guint timestamp)
{
	g_return_if_fail(DBUSMENU_IS_MENUITEM(mi));
	#ifdef MASSIVEDEBUGGING
	g_debug("Menuitem %d (%s) is getting event '%s'", ID(mi), LABEL(mi), name);
	#endif
	DbusmenuMenuitemClass * class = DBUSMENU_MENUITEM_GET_CLASS(mi);

	gboolean handled = FALSE;
	if (variant == NULL) {
		variant = g_variant_new_int32(0);
	}

	g_variant_ref_sink(variant);

	g_signal_emit(G_OBJECT(mi), signals[EVENT], g_quark_from_string(name), name, variant, timestamp, &handled);

	if (!handled && class->handle_event != NULL) {
		class->handle_event(mi, name, variant, timestamp);
	}

	g_variant_unref(variant);
}

/**
 * dbusmenu_menuitem_send_about_to_show:
 * @mi: The #DbusmenuMenuitem to send the signal on.
 * @cb: Callback to call when the call has returned.
 * @cb_data: (closure): Data to pass to the callback.
 * 
 * This function is used to send the even that the submenu
 * of this item is about to be shown.  Callers to this event
 * should delay showing the menu until their callback is
 * called if possible.
 */
void
dbusmenu_menuitem_send_about_to_show (DbusmenuMenuitem * mi, void (*cb) (DbusmenuMenuitem * mi, gpointer user_data), gpointer cb_data)
{
	g_return_if_fail(DBUSMENU_IS_MENUITEM(mi));
	#ifdef MASSIVEDEBUGGING
	g_debug("Submenu for menuitem %d (%s) is about to be shown", ID(mi), LABEL(mi));
	#endif
	DbusmenuMenuitemClass * class = DBUSMENU_MENUITEM_GET_CLASS(mi);

	if (class != NULL && class->send_about_to_show != NULL) {
		return class->send_about_to_show(mi, cb, cb_data);
	} else if (cb != NULL) {
		cb(mi, cb_data);
	}

	return;
}

/**
 * dbusmenu_menuitem_show_to_user:
 * @mi: #DbusmenuMenuitem to show
 * @timestamp: The time that the user requested it to be shown
 * 
 * Signals that this menu item should be shown to the user.  If this is
 * server side the server will then take it and send it over the
 * bus.
 */
void
dbusmenu_menuitem_show_to_user (DbusmenuMenuitem * mi, guint timestamp)
{
	g_return_if_fail(DBUSMENU_IS_MENUITEM(mi));

	g_signal_emit(G_OBJECT(mi), signals[SHOW_TO_USER], 0, timestamp, TRUE);

	return;
}

/* Checks to see if the value of this property is unique or just the
   default value. */
gboolean
dbusmenu_menuitem_property_is_default (DbusmenuMenuitem * mi, const gchar * property)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), FALSE);
	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);

	GVariant * currentval = (GVariant *)g_hash_table_lookup(priv->properties, property);
	if (currentval != NULL) {
		/* If we're storing it locally, then it shouldn't be a default */
		return FALSE;
	}

	/* If we haven't stored it locally, then it's the default */
	return TRUE;
}

/* Check to see if this menu item has been sent into the bus yet or
   not.  If no one cares we can give less info */
gboolean
dbusmenu_menuitem_exposed (DbusmenuMenuitem * mi)
{
	g_return_val_if_fail(DBUSMENU_IS_MENUITEM(mi), FALSE);
	DbusmenuMenuitemPrivate * priv = DBUSMENU_MENUITEM_GET_PRIVATE(mi);
	return priv->exposed;
}