nautilus-application.c 52.6 KB
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/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
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/*
 *  Nautilus
 *
 *  Copyright (C) 1999, 2000 Red Hat, Inc.
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 *  Copyright (C) 2000, 2001 Eazel, Inc.
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 *
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 *  Nautilus is free software; you can redistribute it and/or
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 *  modify it under the terms of the GNU General Public License as
 *  published by the Free Software Foundation; either version 2 of the
 *  License, or (at your option) any later version.
 *
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 *  Nautilus is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
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 *  along with this program; if not, write to the Free Software
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 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
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 *  Authors: Elliot Lee <sopwith@redhat.com>,
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 *           Darin Adler <darin@bentspoon.com>
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 *
 */

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#include <config.h>
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#include "nautilus-application.h"
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#include "file-manager/fm-ditem-page.h"
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#include "file-manager/fm-desktop-icon-view.h"
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#include "file-manager/fm-icon-view.h"
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#include "file-manager/fm-list-view.h"
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#include "file-manager/fm-tree-view.h"
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#if ENABLE_EMPTY_VIEW
#include "file-manager/fm-empty-view.h"
#endif /* ENABLE_EMPTY_VIEW */
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#include "nautilus-information-panel.h"
#include "nautilus-history-sidebar.h"
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#include "nautilus-places-sidebar.h"
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#include "nautilus-notes-viewer.h"
#include "nautilus-emblem-sidebar.h"
#include "nautilus-image-properties-page.h"
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#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
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#include <string.h>
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#include "nautilus-desktop-window.h"
#include "nautilus-first-time-druid.h"
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#include "nautilus-main.h"
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#include "nautilus-spatial-window.h"
#include "nautilus-navigation-window.h"
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#include "nautilus-shell-interface.h"
#include "nautilus-shell.h"
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#include "nautilus-window-bookmarks.h"
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#include "nautilus-window-private.h"
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#include "nautilus-window-manage-views.h"
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#include <libxml/xmlsave.h>
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#include <glib/gstdio.h>
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#include <glib/gi18n.h>
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#include <gio/gfile.h>
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#include <bonobo/bonobo-main.h>
#include <bonobo/bonobo-object.h>
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#include <eel/eel-gtk-extensions.h>
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#include <eel/eel-gtk-macros.h>
#include <eel/eel-stock-dialogs.h>
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#include <gdk/gdkx.h>
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#include <gtk/gtkwindow.h>
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#include <gio/gfile.h>
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#include <libgnome/gnome-config.h>
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#include <libgnomeui/gnome-authentication-manager.h>
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#include <libgnomeui/gnome-client.h>
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#include <libnautilus-private/nautilus-debug-log.h>
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#include <libnautilus-private/nautilus-file-utilities.h>
#include <libnautilus-private/nautilus-global-preferences.h>
#include <libnautilus-private/nautilus-metafile-factory.h>
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#include <libnautilus-private/nautilus-module.h>
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#include <libnautilus-private/nautilus-undo-manager.h>
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#include <libnautilus-private/nautilus-desktop-link-monitor.h>
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#include <libnautilus-private/nautilus-directory-private.h>
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#include <libnautilus-private/nautilus-signaller.h>
#include <libnautilus-extension/nautilus-menu-provider.h>
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#include <bonobo-activation/bonobo-activation.h>
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#include <gio/gthemedicon.h>
#include <gio/gfileicon.h>

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#ifdef HAVE_STARTUP_NOTIFICATION
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#define SN_API_NOT_YET_FROZEN Yes_i_know_DO_IT
#include <libsn/sn-launchee.h>
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#endif
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/* Needed for the is_kdesktop_present check */
#include <gdk/gdkx.h>
#include <X11/Xlib.h>

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#define FACTORY_IID	     "OAFIID:Nautilus_Factory"
#define SEARCH_LIST_VIEW_IID "OAFIID:Nautilus_File_Manager_Search_List_View"
#define SHELL_IID	     "OAFIID:Nautilus_Shell"
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#define TREE_VIEW_IID         "OAFIID:Nautilus_File_Manager_Tree_View"
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/* Keeps track of all the desktop windows. */
static GList *nautilus_application_desktop_windows;
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/* Keeps track of all the nautilus windows. */
static GList *nautilus_application_window_list;

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/* Keeps track of all the object windows */
static GList *nautilus_application_spatial_window_list;

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static void     desktop_changed_callback          (gpointer                  user_data);
static void     desktop_location_changed_callback (gpointer                  user_data);
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static void     volume_unmounted_callback         (GVolumeMonitor           *monitor,
						   GVolume                  *volume,
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						   NautilusApplication      *application);
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static void     volume_mounted_callback           (GVolumeMonitor           *monitor,
						   GVolume                  *volume,
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						   NautilusApplication      *application);
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static void     update_session                    (gpointer                  callback_data);
static void     init_session                      (void);
static gboolean is_kdesktop_present               (void);

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static char    *save_session_to_file              (void);

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BONOBO_CLASS_BOILERPLATE (NautilusApplication, nautilus_application,
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			  BonoboGenericFactory, BONOBO_TYPE_GENERIC_FACTORY)
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static CORBA_Object
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create_object (PortableServer_Servant servant,
	       const CORBA_char *iid,
	       CORBA_Environment *ev)
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{
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	BonoboObject *object;
	NautilusApplication *application;
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	if (strcmp (iid, SHELL_IID) == 0) {
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		application = NAUTILUS_APPLICATION (bonobo_object_from_servant (servant));
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		object = BONOBO_OBJECT (nautilus_shell_new (application));
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	} else if (strcmp (iid, METAFILE_FACTORY_IID) == 0) {
		object = BONOBO_OBJECT (nautilus_metafile_factory_get_instance ());
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	} else {
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		object = CORBA_OBJECT_NIL;
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	}
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	return CORBA_Object_duplicate (BONOBO_OBJREF (object), ev);
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}

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GList *
nautilus_application_get_window_list (void)
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{
	return nautilus_application_window_list;
}

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GList *
nautilus_application_get_spatial_window_list (void)
{
	return nautilus_application_spatial_window_list;
}

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unsigned int
nautilus_application_get_n_windows (void)
{
	return g_list_length (nautilus_application_window_list) +
	       g_list_length (nautilus_application_desktop_windows);
}
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static void
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nautilus_application_instance_init (NautilusApplication *application)
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{
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	/* Create an undo manager */
	application->undo_manager = nautilus_undo_manager_new ();
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	application->shell = nautilus_shell_new (application);
	
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	/* Watch for volume mounts so we can restore open windows
	 * This used to be for showing new window on mount, but is not
	 * used anymore */
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	/* Watch for volume unmounts so we can close open windows */
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	/* TODO-gio: This should be using the UNMOUNTED feature of GDirectoryMonitor instead */
	application->volume_monitor = g_volume_monitor_get ();
	g_signal_connect_object (application->volume_monitor, "volume_unmounted",
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				 G_CALLBACK (volume_unmounted_callback), application, 0);
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	g_signal_connect_object (application->volume_monitor, "volume_pre_unmount",
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				 G_CALLBACK (volume_unmounted_callback), application, 0);
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	g_signal_connect_object (application->volume_monitor, "volume_mounted",
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				 G_CALLBACK (volume_mounted_callback), application, 0);
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	/* register views */
	fm_icon_view_register ();
	fm_desktop_icon_view_register ();
	fm_list_view_register ();
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#if ENABLE_EMPTY_VIEW
	fm_empty_view_register ();
#endif /* ENABLE_EMPTY_VIEW */
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	/* register sidebars */
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	nautilus_places_sidebar_register ();
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	nautilus_information_panel_register ();
	fm_tree_view_register ();
	nautilus_history_sidebar_register ();
	nautilus_notes_viewer_register (); /* also property page */
	nautilus_emblem_sidebar_register ();

	/* register property pages */
	nautilus_image_properties_page_register ();
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}

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NautilusApplication *
nautilus_application_new (void)
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{
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	NautilusApplication *application;

	application = g_object_new (NAUTILUS_TYPE_APPLICATION, NULL);
	
	bonobo_generic_factory_construct_noreg (BONOBO_GENERIC_FACTORY (application),
						FACTORY_IID,
						NULL);
	
	return application;
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}

static void
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nautilus_application_destroy (BonoboObject *object)
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{
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	NautilusApplication *application;

	application = NAUTILUS_APPLICATION (object);

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	nautilus_bookmarks_exiting ();
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	g_object_unref (application->undo_manager);
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	if (application->volume_monitor) {
		g_object_unref (application->volume_monitor);
		application->volume_monitor = NULL;
	}
	
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	if (application->shell_registered) {
		bonobo_activation_unregister_active_server (SHELL_IID, BONOBO_OBJREF (application->shell));
	}
	bonobo_object_unref (application->shell);

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	EEL_CALL_PARENT (BONOBO_OBJECT_CLASS, destroy, (object));
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}
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static gboolean
check_required_directories (NautilusApplication *application)
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{
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	char *user_directory;
	char *desktop_directory;
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	GSList *directories;
	gboolean ret;

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	g_assert (NAUTILUS_IS_APPLICATION (application));
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	ret = TRUE;

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	user_directory = nautilus_get_user_directory ();
	desktop_directory = nautilus_get_desktop_directory ();

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	directories = NULL;

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	if (!g_file_test (user_directory, G_FILE_TEST_IS_DIR)) {
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		directories = g_slist_prepend (directories, user_directory);
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	}
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	if (!g_file_test (desktop_directory, G_FILE_TEST_IS_DIR)) {
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		directories = g_slist_prepend (directories, desktop_directory);
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	}

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	if (directories != NULL) {
		int failed_count;
		GString *directories_as_string;
		GSList *l;
		char *error_string;
		const char *detail_string;
		GtkDialog *dialog;

		ret = FALSE;
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		failed_count = g_slist_length (directories);

		directories_as_string = g_string_new ((const char *)directories->data);
		for (l = directories->next; l != NULL; l = l->next) {
			g_string_append_printf (directories_as_string, ", %s", (const char *)l->data);
		}
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		if (failed_count == 1) {
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			error_string = g_strdup_printf (_("Nautilus could not create the required folder \"%s\"."),
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							directories_as_string->str);
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			detail_string = _("Before running Nautilus, please create the following folder, or "
					  "set permissions such that Nautilus can create it.");
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		} else {
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			error_string = g_strdup_printf (_("Nautilus could not create the following required folders: "
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							  "%s."), directories_as_string->str);
			detail_string = _("Before running Nautilus, please create these folders, or "
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					  "set permissions such that Nautilus can create them.");
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		}
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		dialog = eel_show_error_dialog (error_string, detail_string, NULL);
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		/* We need the main event loop so the user has a chance to see the dialog. */
		nautilus_main_event_loop_register (GTK_OBJECT (dialog));
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		g_string_free (directories_as_string, TRUE);
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		g_free (error_string);
	}

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	g_slist_free (directories);
	g_free (user_directory);
	g_free (desktop_directory);
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	return ret;
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}

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static Nautilus_URIList *
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nautilus_make_uri_list_from_shell_strv (const char * const *strv)
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{
	int length, i;
	Nautilus_URIList *uri_list;
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	GFile *file;
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	char *translated_uri;
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	length = g_strv_length ((char **) strv);
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	uri_list = Nautilus_URIList__alloc ();
	uri_list->_maximum = length;
	uri_list->_length = length;
	uri_list->_buffer = CORBA_sequence_Nautilus_URI_allocbuf (length);
	for (i = 0; i < length; i++) {
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		file = g_file_new_for_commandline_arg (strv[i]);
		translated_uri = g_file_get_uri (file);
		g_object_unref (file);
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		uri_list->_buffer[i] = CORBA_string_dup (translated_uri);
		g_free (translated_uri);
		translated_uri = NULL;
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	}
	CORBA_sequence_set_release (uri_list, CORBA_TRUE);

	return uri_list;
}

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static void
migrate_old_nautilus_files (void)
{
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	char *new_desktop_dir;
	char *old_desktop_dir;
	char *migrated_file;
	char *link_name;
	char *link_path;
	int fd;
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	old_desktop_dir = nautilus_get_gmc_desktop_directory ();
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	if (!g_file_test (old_desktop_dir, G_FILE_TEST_IS_DIR) ||
	    g_file_test (old_desktop_dir, G_FILE_TEST_IS_SYMLINK)) {
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		g_free (old_desktop_dir);
		return;
	}
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	migrated_file = g_build_filename (old_desktop_dir, ".migrated", NULL);
	if (!g_file_test (migrated_file, G_FILE_TEST_EXISTS)) {
		link_name = g_filename_from_utf8 (_("Link To Old Desktop"), -1, NULL, NULL, NULL);
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		new_desktop_dir = nautilus_get_desktop_directory ();
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		link_path = g_build_filename (new_desktop_dir, link_name, NULL);
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		symlink ("../.gnome-desktop", link_path);
		
		g_free (link_name);
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		g_free (new_desktop_dir);
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		g_free (link_path);
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		fd = creat (migrated_file, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
		if (fd >= 0) {
			close (fd);
		}
		
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		eel_show_info_dialog (_("A link called \"Link To Old Desktop\" has been created on the desktop."),
				      _("The location of the desktop directory has changed in GNOME 2.4. "
					"You can open the link and move over the files you want, then delete the link."),
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				      NULL);
	}
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	g_free (old_desktop_dir);
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	g_free (migrated_file);
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}

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static void
menu_provider_items_updated_handler (NautilusMenuProvider *provider, GtkWidget* parent_window, gpointer data)
{

	g_signal_emit_by_name (nautilus_signaller_get_current (),
			       "popup_menu_changed");
}

static void
menu_provider_init_callback (void)
{
        GList *items;
        GList *providers;
        GList *l;

        providers = nautilus_module_get_extensions_for_type (NAUTILUS_TYPE_MENU_PROVIDER);
        items = NULL;

        for (l = providers; l != NULL; l = l->next) {
                NautilusMenuProvider *provider = NAUTILUS_MENU_PROVIDER (l->data);

		g_signal_connect_after (G_OBJECT (provider), "items_updated",
                           (GCallback)menu_provider_items_updated_handler,
                           NULL);
        }

        nautilus_module_extension_list_free (providers);
}

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static void
finish_startup (NautilusApplication *application)
{
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	/* initialize nautilus modules */
	nautilus_module_init ();

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	nautilus_module_add_type (FM_TYPE_DITEM_PAGE);
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	/* attach menu-provider module callback */
	menu_provider_init_callback ();
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	/* initialize URI authentication manager */
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	gnome_authentication_manager_init ();
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	/* Make the desktop work with old Nautilus. */
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	migrate_old_nautilus_files ();
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	/* Initialize the desktop link monitor singleton */
	nautilus_desktop_link_monitor_get ();
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}

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static void
initialize_kde_trash_hack (void)
{
	char *trash_dir;
	char *desktop_dir, *desktop_uri, *kde_trash_dir;
	char *dir, *basename;
	char *kde_conf_file;
	char *key;
	gboolean def;
	
	trash_dir = NULL;

	desktop_uri = nautilus_get_desktop_directory_uri_no_create ();
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	desktop_dir = g_filename_from_uri (desktop_uri, NULL, NULL);
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	g_free (desktop_uri);
	
	if (g_file_test (desktop_dir, G_FILE_TEST_EXISTS)) {
		/* Look for trash directory */
		kde_conf_file = g_build_filename (g_get_home_dir(), ".kde/share/config/kdeglobals", NULL);
		key = g_strconcat ("=", kde_conf_file, "=/Paths/Trash", NULL);
		kde_trash_dir = gnome_config_get_string_with_default (key, &def);
		gnome_config_drop_file (kde_conf_file);
		g_free (kde_conf_file);
		g_free (key);

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		if (kde_trash_dir == NULL) {
			kde_conf_file = "/usr/share/config/kdeglobals";
			key = g_strconcat ("=", kde_conf_file, "=/Paths/Trash", NULL);
			kde_trash_dir = gnome_config_get_string_with_default (key, &def);
			gnome_config_drop_file (kde_conf_file);
			g_free (key);
		}

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		if (kde_trash_dir != NULL) {
			basename = g_path_get_basename (kde_trash_dir);
			g_free (kde_trash_dir);
			
			dir = g_build_filename (desktop_dir, basename, NULL);

			if (g_file_test (dir, G_FILE_TEST_IS_DIR)) {
				trash_dir = g_strdup (basename);
			} 
			g_free (basename);
			g_free (dir);
		} 

		if (trash_dir != NULL) {
			nautilus_set_kde_trash_name (trash_dir);
		}

		g_free (trash_dir);
	}
	g_free (desktop_dir);
}

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static Bonobo_RegistrationResult
nautilus_bonobo_activation_register_for_display (const char    *iid,
						 Bonobo_Unknown ref)
{
	const char *display_name;
	GSList *reg_env ;
	Bonobo_RegistrationResult result;
	
	display_name = gdk_display_get_name (gdk_display_get_default());
	reg_env = bonobo_activation_registration_env_set (NULL,
							  "DISPLAY", display_name);
	result = bonobo_activation_register_active_server (iid, ref, reg_env);
	bonobo_activation_registration_env_free (reg_env);
	return result;
}

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void
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nautilus_application_startup (NautilusApplication *application,
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			      gboolean kill_shell,
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			      gboolean restart_shell,
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			      gboolean no_default_window,
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			      gboolean no_desktop,
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			      gboolean do_first_time_druid_check,
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			      gboolean browser_window,
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			      const char *startup_id,
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			      const char *geometry,
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			      const char *session_to_load,
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			      const char *urls[])
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{
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	CORBA_Environment ev;
	Nautilus_Shell shell;
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	Bonobo_RegistrationResult result;
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	const char *message, *detailed_message;
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	GtkDialog *dialog;
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	Nautilus_URIList *url_list;
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	const CORBA_char *corba_startup_id;
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	const CORBA_char *corba_geometry;
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	int num_failures;

	num_failures = 0;
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	/* Check the user's ~/.nautilus directories and post warnings
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	 * if there are problems.
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	 */
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	if (!kill_shell && !check_required_directories (application)) {
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		return;
	}
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	initialize_kde_trash_hack ();

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	CORBA_exception_init (&ev);

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	/* Start up the factory. */
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	while (TRUE) {
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		/* Try to register the file manager view factory. */
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		result = nautilus_bonobo_activation_register_for_display
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			(SHELL_IID, BONOBO_OBJREF (application->shell));
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		switch (result) {
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		case Bonobo_ACTIVATION_REG_SUCCESS:
			/* We are registered and all is right with the world. */
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			application->shell_registered = TRUE;
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			finish_startup (application);
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			message = NULL;
			detailed_message = NULL;
			break;
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		case Bonobo_ACTIVATION_REG_ALREADY_ACTIVE:
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			/* Another copy of nautilus already is running and registered. */
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			message = NULL;
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			detailed_message = NULL;
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			break;
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		case Bonobo_ACTIVATION_REG_NOT_LISTED:
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			/* Can't register myself due to trouble locating the
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			 * Nautilus_Shell.server file. This has happened when you
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			 * launch Nautilus with an LD_LIBRARY_PATH that
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			 * doesn't include the directory containing the oaf
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			 * library. It could also happen if the
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			 * Nautilus_Shell.server file was not present for some
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			 * reason. Sometimes killing oafd and gconfd fixes
			 * this problem but we don't exactly understand why,
			 * since neither of the above causes explain it.
			 */
			message = _("Nautilus can't be used now. "
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				    "Running the command \"bonobo-slay\""
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				    " from the console may fix the problem. If not,"
				    " you can try rebooting the computer or"
				    " installing Nautilus again.");
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			/* FIXME bugzilla.gnome.org 42536: The guesses and stuff here are lame. */
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			detailed_message = _("Nautilus can't be used now. "
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					     "Running the command \"bonobo-slay\" "
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					     "from the console may fix the problem. If not, "
					     "you can try rebooting the computer or "
					     "installing Nautilus again.\n\n"
					     "Bonobo couldn't locate the Nautilus_shell.server file. "
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					     "One cause of this seems to be an LD_LIBRARY_PATH "
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					     "that does not include the bonobo-activation library's directory. "
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					     "Another possible cause would be bad install "
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					     "with a missing Nautilus_Shell.server file.\n\n"
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					     "Running \"bonobo-slay\" will kill all "
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					     "Bonobo Activation and GConf processes, which may be needed by "
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					     "other applications.\n\n"
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					     "Sometimes killing bonobo-activation-server and gconfd fixes "
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					     "the problem, but we don't know why.\n\n"
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					     "We have also seen this error when a faulty "
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					     "version of bonobo-activation was installed.");
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			break;
		default:
			/* This should never happen. */
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			g_warning ("bad error code from bonobo_activation_active_server_register");
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		case Bonobo_ACTIVATION_REG_ERROR:
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			/* Some misc. error (can never happen with current
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			 * version of bonobo-activation). Show dialog and terminate the
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			 * program.
			 */
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			/* FIXME bugzilla.gnome.org 42537: Looks like this does happen with the
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			 * current OAF. I guess I read the code wrong. Need to figure out when and make a
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			 * good message.
			 */
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			message = _("Nautilus can't be used now, due to an unexpected error.");
			detailed_message = _("Nautilus can't be used now, due to an unexpected error "
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					     "from Bonobo when attempting to register the file manager view server.");
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			break;
		}
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		/* Get the shell object. */
		if (message == NULL) {
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			shell = bonobo_activation_activate_from_id (SHELL_IID, Bonobo_ACTIVATION_FLAG_EXISTING_ONLY, NULL, NULL);
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			if (!CORBA_Object_is_nil (shell, &ev)) {
				break;
			}

			/* If we couldn't find ourselves it's a bad problem so
			 * we better stop looping.
			 */
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			if (result == Bonobo_ACTIVATION_REG_SUCCESS) {
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				/* FIXME bugzilla.gnome.org 42538: When can this happen? */
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				message = _("Nautilus can't be used now, due to an unexpected error.");
				detailed_message = _("Nautilus can't be used now, due to an unexpected error "
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						     "from Bonobo when attempting to locate the factory. "
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						     "Killing bonobo-activation-server and restarting Nautilus may help fix the problem.");
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			} else {
				num_failures++;
				if (num_failures > 20) {
					message = _("Nautilus can't be used now, due to an unexpected error.");
					detailed_message = _("Nautilus can't be used now, due to an unexpected error "
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							     "from Bonobo when attempting to locate the shell object. "
							     "Killing bonobo-activation-server and restarting Nautilus may help fix the problem.");
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				}
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			}
		}

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		if (message != NULL) {
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			dialog = eel_show_error_dialog_with_details (message, NULL, detailed_message, NULL);
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			/* We need the main event loop so the user has a chance to see the dialog. */
			nautilus_main_event_loop_register (GTK_OBJECT (dialog));
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			goto out;
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		}
	}

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	if (kill_shell) {
		Nautilus_Shell_quit (shell, &ev);
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	} else if (restart_shell) {
		Nautilus_Shell_restart (shell, &ev);
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	} else {
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		/* If KDE desktop is running, then force no_desktop */
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		if (is_kdesktop_present ()) {
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			no_desktop = TRUE;
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		}
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		if (!no_desktop && eel_preferences_get_boolean (NAUTILUS_PREFERENCES_SHOW_DESKTOP)) {
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			Nautilus_Shell_start_desktop (shell, &ev);
		}
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		/* Monitor the preference to show or hide the desktop */
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		eel_preferences_add_callback_while_alive (NAUTILUS_PREFERENCES_SHOW_DESKTOP,
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							  desktop_changed_callback,
							  application,
							  G_OBJECT (application));
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		/* Monitor the preference to have the desktop */
		/* point to the Unix home folder */
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		eel_preferences_add_callback_while_alive (NAUTILUS_PREFERENCES_DESKTOP_IS_HOME_DIR,
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							  desktop_location_changed_callback,
							  NULL,
							  G_OBJECT (application));
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		/* CORBA C mapping doesn't allow NULL to be passed
		   for string parameters */
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		corba_geometry   = (geometry   != NULL) ? geometry   : "";
		corba_startup_id = (startup_id != NULL) ? startup_id : "";
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	  	/* Create the other windows. */
		if (urls != NULL) {
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			url_list = nautilus_make_uri_list_from_shell_strv (urls);
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			Nautilus_Shell_open_windows (shell, url_list, corba_startup_id, corba_geometry, browser_window, &ev);
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			CORBA_free (url_list);
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		} else if (!no_default_window) {
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			g_assert (session_to_load == NULL);
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			Nautilus_Shell_open_default_window (shell, corba_startup_id, corba_geometry, browser_window, &ev);
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		}
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		if (session_to_load != NULL) {
			Nautilus_Shell_load_session (shell, session_to_load, &ev);
		}
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		/* Add ourselves to the session */
		init_session ();
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	}
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 out:
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	CORBA_exception_free (&ev);
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}

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static void 
selection_get_cb (GtkWidget          *widget,
		  GtkSelectionData   *selection_data,
		  guint               info,
		  guint               time)
{
	/* No extra targets atm */
}

static GtkWidget *
get_desktop_manager_selection (GdkDisplay *display, int screen)
{
	char *selection_name;
	GdkAtom selection_atom;
	Window selection_owner;
	GtkWidget *selection_widget;

	selection_name = g_strdup_printf ("_NET_DESKTOP_MANAGER_S%d", screen);
	selection_atom = gdk_atom_intern (selection_name, FALSE);
	g_free (selection_name);

	selection_owner = XGetSelectionOwner (GDK_DISPLAY_XDISPLAY (display),
					      gdk_x11_atom_to_xatom_for_display (display, 
										 selection_atom));
	if (selection_owner != None) {
		return NULL;
	}
	
	selection_widget = gtk_invisible_new_for_screen (gdk_display_get_screen (display, screen));
	/* We need this for gdk_x11_get_server_time() */
	gtk_widget_add_events (selection_widget, GDK_PROPERTY_CHANGE_MASK);

	if (gtk_selection_owner_set_for_display (display,
						 selection_widget,
						 selection_atom,
						 gdk_x11_get_server_time (selection_widget->window))) {
		
		g_signal_connect (selection_widget, "selection_get",
				  G_CALLBACK (selection_get_cb), NULL);
		return selection_widget;
	}

	gtk_widget_destroy (selection_widget);
	
	return NULL;
}

static void
desktop_unrealize_cb (GtkWidget        *widget,
		      GtkWidget        *selection_widget)
{
	gtk_widget_destroy (selection_widget);
}

static gboolean
selection_clear_event_cb (GtkWidget	        *widget,
			  GdkEventSelection     *event,
			  NautilusDesktopWindow *window)
{
	gtk_widget_destroy (GTK_WIDGET (window));
	
	nautilus_application_desktop_windows =
		g_list_remove (nautilus_application_desktop_windows, window);

	return TRUE;
}

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static void
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nautilus_application_create_desktop_windows (NautilusApplication *application)
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{
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	static gboolean create_in_progress = FALSE;
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	GdkDisplay *display;
	NautilusDesktopWindow *window;
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	GtkWidget *selection_widget;
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	int screens, i;
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	g_return_if_fail (nautilus_application_desktop_windows == NULL);
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	g_return_if_fail (NAUTILUS_IS_APPLICATION (application));
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	if (create_in_progress) {
		return;
	}

	create_in_progress = TRUE;

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	display = gdk_display_get_default ();
	screens = gdk_display_get_n_screens (display);

	for (i = 0; i < screens; i++) {
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		selection_widget = get_desktop_manager_selection (display, i);
		if (selection_widget != NULL) {
			window = nautilus_desktop_window_new (application,
							      gdk_display_get_screen (display, i));
			
			g_signal_connect (selection_widget, "selection_clear_event",
					  G_CALLBACK (selection_clear_event_cb), window);
			
			g_signal_connect (window, "unrealize",
					  G_CALLBACK (desktop_unrealize_cb), selection_widget);
			
			/* We realize it immediately so that the NAUTILUS_DESKTOP_WINDOW_ID
			   property is set so gnome-settings-daemon doesn't try to set the
			   background. And we do a gdk_flush() to be sure X gets it. */
			gtk_widget_realize (GTK_WIDGET (window));
			gdk_flush ();

			
			nautilus_application_desktop_windows =
				g_list_prepend (nautilus_application_desktop_windows, window);
		}
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	}
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	create_in_progress = FALSE;
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}

void
nautilus_application_open_desktop (NautilusApplication *application)
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{
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	if (nautilus_application_desktop_windows == NULL) {
		nautilus_application_create_desktop_windows (application);
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		/* Make sure we update the session when the desktop is created */
		update_session (gnome_master_client ());
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	}
}

void
nautilus_application_close_desktop (void)
{
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	if (nautilus_application_desktop_windows != NULL) {
		g_list_foreach (nautilus_application_desktop_windows,
				(GFunc) gtk_widget_destroy, NULL);
		g_list_free (nautilus_application_desktop_windows);
		nautilus_application_desktop_windows = NULL;
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		/* Make sure we update the session when the desktop goes away */
		update_session (gnome_master_client ());
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	}
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}

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void
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nautilus_application_close_all_navigation_windows (void)
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{
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	GList *list_copy;
	GList *l;
	
	list_copy = g_list_copy (nautilus_application_window_list);
	for (l = list_copy; l != NULL; l = l->next) {
		NautilusWindow *window;
		
		window = NAUTILUS_WINDOW (l->data);
		
		if (NAUTILUS_IS_NAVIGATION_WINDOW (window)) {
			nautilus_window_close (window);
		}
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	}
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	g_list_free (list_copy);
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}

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static NautilusSpatialWindow *
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nautilus_application_get_existing_spatial_window (GFile *location)
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{
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	GList *l;
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	for (l = nautilus_application_get_spatial_window_list ();
	     l != NULL; l = l->next) {
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		GFile *window_location;

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