95_desktop-effects-integration.patch

Description: Add desktop effects tab to the appearance capplet
Author: ?

Index: gnome-control-center-2.30.0/capplets/appearance/appearance-effects.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ gnome-control-center-2.30.0/capplets/appearance/appearance-effects.c	2010-04-10 00:21:01.152659047 +0100
@@ -0,0 +1,1089 @@
+/*
+ * Copyright (C) 2007 Canonical
+ * Written by Michael Vogt <mvo@ubuntu.com>
+ * and Mirco Müller <mirco@ubuntu.com>
+ * All Rights Reserved
+ *
+ * Based on desktop-effects.c:
+ *   Desktop Effects. A preference panel for compiz.
+ *   Copyright (C) 2006   Red Hat, Inc.
+ * Author: Soren Sandmann (sandmann@redhat.com) *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <glib.h>
+#include <glib/gstdio.h>
+#include <X11/Xlib.h>
+#include <X11/Xatom.h>
+#include <gdk/gdkx.h>
+#include <X11/extensions/Xcomposite.h>
+#include <math.h>
+#include <stdlib.h>
+
+#include "appearance.h"
+#include "appearance-effects.h"
+
+#include "gconf-property-editor.h"
+
+typedef enum {
+	COMPIZ,
+	METACITY
+} WindowManager;
+
+#define WINDOW_MANAGER_KEY "/desktop/gnome/session/required_components/windowmanager"
+#define REVERT_COUNT	   40
+#define SECONDS_WE_WILL_WAIT_FOR_COMPIZ_TO_START 8
+#define PLUGIN_LIST_KEY	   "/apps/compiz/general/allscreens/options/active_plugins"
+#define NUM_WORKSPACES	   "/apps/metacity/general/num_workspaces"
+
+/* helper structure to pass pager data around */
+typedef struct _TraversalChunk {
+	GConfClient *client;
+	GArray	    *numRowsArray;
+	gint	    rows;
+} TraversalChunk;
+
+/* possible effects level */
+enum {
+	NO_EFFECTS, 
+	NORMAL_EFFECTS, 
+	EXTRA_EFFECTS, 
+	CUSTOM_EFFECTS
+};
+
+/* radio-button names in ui-file */
+static const char *effect_choices[] =  {
+	"no_effects_button",
+	"normal_effects_button", 
+	"extra_effects_button",
+	"custom_effects_button"
+};
+
+/* plugin-set for extra-effects level */
+static const gchar* extra_effects[] = {
+	"shift",
+	"wobbly",
+	NULL
+};
+
+static gboolean
+check_graphics_driver (void)
+{
+	return system ("jockey-gtk --check-composite") == 0;
+}
+
+static gboolean
+check_simple_ccsm (void)
+{
+	return g_file_test ("/usr/bin/simple-ccsm", G_FILE_TEST_IS_EXECUTABLE);
+}
+
+static void
+run_simple_ccsm (GtkButton *widget,
+	  gpointer  data)
+{
+	g_spawn_command_line_async ("/usr/bin/simple-ccsm", NULL);
+}
+
+static GSList *
+get_plugins (AppearanceData *app,
+	     GError	    **err)
+{
+	return gconf_client_get_list (app->client,
+				      PLUGIN_LIST_KEY,
+				      GCONF_VALUE_STRING,
+				      err);
+}
+
+static gboolean
+contains_string (GSList	     *plugins,
+		 const gchar *needle)
+{
+	GSList *slist;
+
+	for (slist = plugins; slist != NULL; slist = slist->next)
+	{
+		const char *s = slist->data;
+
+		if (s && strcmp (s, needle) == 0)
+			return TRUE;
+	}
+
+	return FALSE;
+}
+
+
+static void
+show_info (const char *text)
+{
+	GtkWidget *dialog;
+
+	dialog = gtk_message_dialog_new (NULL,
+					 GTK_DIALOG_MODAL,
+					 GTK_MESSAGE_INFO,
+					 GTK_BUTTONS_OK,
+					 "%s",
+					 text);
+
+	gtk_dialog_run (GTK_DIALOG (dialog));
+	gtk_widget_destroy (dialog);
+}
+
+static gchar*
+get_string_value (GConfClient* client,
+		  const gchar* key)
+{
+	gchar  *value = NULL;
+	GError *error = NULL;
+
+	g_assert (client != NULL);
+	g_assert (key    != NULL);
+
+	value = gconf_client_get_string (client, key, &error);
+	if (error)
+		return NULL;
+
+	return value;
+}
+
+static gint
+get_int_value (GConfClient* client,
+	       const gchar* key)
+{
+	gint	value = 0;
+	GError*	error = NULL;
+
+	g_assert (client != NULL);
+	g_assert (key    != NULL);
+
+	value = gconf_client_get_int (client, key, &error);
+	if (error)
+		return 0;
+
+	return value;
+}
+
+static void
+check_for_wnck_entry (gpointer data,
+		      gpointer user_data)
+{
+	gchar		*appletId	= (gchar*) data;
+	TraversalChunk	*chunk		= (TraversalChunk*) user_data;
+	GString		*propertyPath	= NULL;
+	gchar		*value		= NULL;
+	gint		rows		= 0;
+	gint		position	= 0;
+
+	/* get bonobo-id of applet */
+	propertyPath = g_string_new ("/apps/panel/applets/");
+	propertyPath = g_string_append (propertyPath, appletId);
+	propertyPath = g_string_append (propertyPath, "/bonobo_iid");
+	value = get_string_value (chunk->client, propertyPath->str);
+
+	/* just exit if no bonobo-id was found */
+	if (!value)
+	{
+		g_string_free (propertyPath, TRUE);
+		return;
+	}
+
+	/* test if it is actually a switcher */
+	if (!g_ascii_strncasecmp (value,
+				  "OAFIID:GNOME_WorkspaceSwitcherApplet",
+				  36))
+	{
+		/* assemble new gconf-path for num_rows gconf-key */
+		g_string_free (propertyPath, TRUE);
+		propertyPath = g_string_new ("/apps/panel/applets/");
+		propertyPath = g_string_append (propertyPath, appletId);
+		propertyPath = g_string_append (propertyPath, "/position");
+
+		/* get the value of position */
+		position = get_int_value (chunk->client, propertyPath->str);
+
+		if (position > 1)
+		{
+			/* assemble new gconf-path for num_rows gconf-key */
+			g_string_free (propertyPath, TRUE);
+			propertyPath = g_string_new ("/apps/panel/applets/");
+			propertyPath = g_string_append (propertyPath, appletId);
+			propertyPath = g_string_append (propertyPath,
+							"/prefs/num_rows");
+
+			/* get the value of rows */
+			rows = get_int_value (chunk->client, propertyPath->str);
+
+			if (!chunk->numRowsArray)
+				chunk->numRowsArray = g_array_new (TRUE,
+								   TRUE,
+								   sizeof (gint));
+
+			g_array_append_val (chunk->numRowsArray, rows);
+		}
+	}
+
+	g_string_free (propertyPath, TRUE);
+}
+
+gboolean
+set_int_value (GConfClient *client,
+               const gchar *key,
+               gint        value)
+{
+	gboolean result = FALSE;
+	GError   *error = NULL;
+
+	g_assert (client != NULL);
+	g_assert (key    != NULL);
+
+	result = gconf_client_set_int (client,
+				       key,
+				       value,
+				       &error);
+
+	if (error)
+		return FALSE;
+
+	return result;
+}
+
+static void
+set_wnck_entry (gpointer data,
+                gpointer user_data)
+{
+	gchar		*appletId	= (gchar*) data;
+	TraversalChunk	*chunk		= (TraversalChunk*) user_data;
+	GString		*propertyPath	= NULL;
+	gchar		*value		= NULL;
+	gint		position	= 0;
+
+	/* get bonobo-id of applet */
+	propertyPath = g_string_new ("/apps/panel/applets/");
+	propertyPath = g_string_append (propertyPath, appletId);
+	propertyPath = g_string_append (propertyPath, "/bonobo_iid");
+	value = get_string_value (chunk->client, propertyPath->str);
+
+	/* just exit if no bonobo-id was found */
+	if (!value)
+	{
+		g_string_free (propertyPath, TRUE);
+		return;
+	}
+
+	/* test if it is actually a switcher */
+	if (!g_ascii_strncasecmp (value,
+				  "OAFIID:GNOME_WorkspaceSwitcherApplet",
+				  36))
+	{
+		/* assemble new gconf-path for applets position gconf-key */
+		g_string_free (propertyPath, TRUE);
+		propertyPath = g_string_new ("/apps/panel/applets/");
+		propertyPath = g_string_append (propertyPath, appletId);
+		propertyPath = g_string_append (propertyPath, "/position");
+
+		/* get the value of position */
+		position = get_int_value (chunk->client, propertyPath->str);
+
+		/* not the best way to test, if this applet is really active */
+		if (position > 1)
+		{
+			/* assemble new gconf-path for num_rows gconf-key */
+			g_string_free (propertyPath, TRUE);
+			propertyPath = g_string_new ("/apps/panel/applets/");
+			propertyPath = g_string_append (propertyPath, appletId);
+			propertyPath = g_string_append (propertyPath,
+							"/prefs/num_rows");
+
+			/* set the value of rows */
+			set_int_value (chunk->client,
+				       propertyPath->str,
+				       chunk->rows);
+		}
+	}
+
+	/* cleanup */
+	g_string_free (propertyPath, TRUE);
+}
+
+static gint
+get_pager_num_rows (GConfClient *client)
+{
+	GSList         *idList = NULL;
+	TraversalChunk *chunk  = NULL;
+	gint           rows    = 0;
+
+	/* get ids of all used applets */
+	idList = gconf_client_get_list (client,
+					"/apps/panel/general/applet_id_list",
+					GCONF_VALUE_STRING,
+					NULL);
+
+	if (!idList)
+		return 1;
+
+	/* create and initialize helper-structure */
+	chunk = g_new0 (TraversalChunk, 1);
+	if (!chunk)
+	{
+		g_slist_free (idList);
+		return 1;
+	}
+
+	chunk->client = client;
+
+	/* search list of applets for wnck-applet */
+	g_slist_foreach (idList,
+			 check_for_wnck_entry,
+			 (gpointer) chunk);
+
+	if (chunk->numRowsArray == NULL)
+		rows = 1;
+	else
+		rows = g_array_index (chunk->numRowsArray, gint, 0);
+
+	/* clean up */
+	g_slist_free (idList);
+    if (chunk->numRowsArray)
+		g_array_free (chunk->numRowsArray, TRUE);
+	g_free (chunk);
+
+	return rows;
+}
+
+/* sets the number of rows of the first pager-applet found */
+void static
+set_pager_num_rows (GConfClient *client,
+                    gint        rows)
+{
+	GSList         *idList = NULL;
+	TraversalChunk *chunk  = NULL;
+
+	/* get ids of all used applets */
+	idList = gconf_client_get_list (client,
+					"/apps/panel/general/applet_id_list",
+					GCONF_VALUE_STRING,
+					NULL);
+
+	/* if nothing is found at least return 1 to avoid a div. by 0 later */
+	if (!idList)
+		return;
+
+	/* create and initialize helper-structure */
+	chunk = g_new0 (TraversalChunk, 1);
+	if (!chunk)
+	{
+		g_slist_free (idList);
+		return;
+	}
+
+	chunk->client = client;
+	chunk->rows = rows;
+
+	/* search list of applets for wnck-applet */
+	g_slist_foreach (idList,
+			 set_wnck_entry,
+			 (gpointer) chunk);
+
+	/* clean up */
+	g_slist_free (idList);
+    if (chunk->numRowsArray)
+		g_array_free (chunk->numRowsArray, TRUE);
+	g_free (chunk);
+}
+
+static void
+apply_settings (AppearanceData	*app,
+		gboolean	effects_enabled)
+{
+        const char *str = effects_enabled? "compiz" : "metacity";
+	char	   *session_file;
+	gint	   vsize;
+	gint	   hsize;
+	gint	   workspaces;
+	gint	   rows;
+
+	gconf_client_set_string (app->client,
+				 WINDOW_MANAGER_KEY,
+				 str,
+				 NULL);
+
+	session_file = g_build_filename (g_get_home_dir (),
+					 ".gnome2",
+					 "session",
+					 NULL);
+
+	g_unlink (session_file);
+	g_free (session_file);
+
+	/* here the whole logic for mapping any N:M workspace-layout from
+	 * metacity to compiz or vice versa is handled, currently only
+	 * implemented for one-screen setups */
+	if (effects_enabled)
+	{
+		workspaces = get_int_value (app->client,
+				            "/apps/metacity/general/num_workspaces");
+		rows = get_pager_num_rows (app->client);
+		set_int_value (app->client,
+			       "/apps/compiz/general/screen0/options/vsize",
+			       rows);
+		set_int_value (app->client,
+			       "/apps/compiz/general/screen0/options/hsize",
+			       (gint) ceilf ((gfloat) workspaces / (gfloat) rows));
+		set_pager_num_rows (app->client, 1);
+	}
+	else if (app->compiz_was_running)
+	{
+		vsize = get_int_value (app->client,
+				       "/apps/compiz/general/screen0/options/vsize");
+		hsize = get_int_value (app->client,
+				       "/apps/compiz/general/screen0/options/hsize");
+		set_int_value (app->client,
+			       "/apps/metacity/general/num_workspaces",
+			       vsize * hsize);
+		set_pager_num_rows (app->client, vsize);
+	}
+}
+
+static void
+set_busy (GtkWidget *widget,
+	  gboolean  busy)
+{
+	GdkCursor *cursor;
+
+	if (busy)
+		cursor = gdk_cursor_new (GDK_WATCH);
+	else
+		cursor = NULL;
+
+	gdk_window_set_cursor (widget->window, cursor);
+
+	if (cursor)
+		gdk_cursor_unref (cursor);
+
+	gdk_flush ();
+}
+
+
+gchar*
+get_current_window_manager (void)
+{
+	Window	*xwindow;
+	Atom	type;
+	gint	format;
+	gulong	nitems;
+	gulong	bytes_after;
+	gchar  *name;
+
+	XGetWindowProperty (GDK_DISPLAY (),
+			    GDK_ROOT_WINDOW (),
+			    XInternAtom (GDK_DISPLAY (),
+			    		 "_NET_SUPPORTING_WM_CHECK",
+			    		 False),
+			    0,
+			    G_MAXLONG,
+			    False,
+			    XA_WINDOW,
+			    &type,
+			    &format,
+			    &nitems,
+			    &bytes_after,
+			    (guchar **) &xwindow);
+
+	if (type != XA_WINDOW)
+		return NULL;
+
+	gdk_error_trap_push ();
+	XSelectInput (GDK_DISPLAY (),
+		      *xwindow,
+		      StructureNotifyMask | PropertyChangeMask);
+	XSync (GDK_DISPLAY (), False);
+
+	if (gdk_error_trap_pop ())
+	{
+		XFree (xwindow);
+		return NULL;
+	}
+
+	name = NULL;
+
+	gdk_error_trap_push ();
+          
+	XGetWindowProperty (GDK_DISPLAY (),
+			    *xwindow,
+			    XInternAtom (GDK_DISPLAY (),
+					 "_NET_WM_NAME",
+					 False),
+			    0,
+			    G_MAXLONG,
+			    False,
+			    XInternAtom (GDK_DISPLAY (),
+					 "UTF8_STRING",
+					 False),
+			    &type,
+			    &format,
+			    &nitems,
+			    &bytes_after,
+			    (guchar **)&name);
+          
+	gdk_display_sync (GDK_DISPLAY ());
+	gdk_error_trap_pop ();
+	XFree (xwindow);
+	return name;
+}
+
+static gboolean
+compiz_started (void)
+{
+	gboolean result;
+	gchar *wm = get_current_window_manager ();
+
+	result = wm && strcmp (wm, "compiz") == 0;
+	g_free (wm);
+
+	return result;
+}
+
+typedef struct TimedDialogInfo {
+	AppearanceData	*app;
+	GTimer		*timer;
+	GtkWidget	*button;
+} TimedDialogInfo;
+
+static WindowManager
+current_configured_wm (AppearanceData *app,
+		       GError	      **err)
+{
+	GError *tmp = NULL;
+
+	const char *str = gconf_client_get_string (app->client,
+						   WINDOW_MANAGER_KEY,
+						   &tmp);
+
+	if (tmp)
+	{
+		g_propagate_error (err, tmp);
+		return METACITY;
+	}
+
+	if (str && strcmp (str, "compiz") == 0)
+		return COMPIZ;
+	else
+		return METACITY;
+}
+
+static void
+show_error (const GError *err)
+{
+	GtkWidget *dialog;
+
+	if (!err)
+		return;
+
+	dialog = gtk_message_dialog_new (NULL,
+					 GTK_DIALOG_DESTROY_WITH_PARENT,
+					 GTK_MESSAGE_WARNING,
+					 GTK_BUTTONS_OK,
+					 "%s",
+					 err->message);
+
+	gtk_window_set_title (GTK_WINDOW (dialog), "");
+
+	gtk_dialog_run (GTK_DIALOG (dialog));
+	gtk_widget_destroy (dialog);
+}
+
+struct TimeoutData {
+	int	  time;
+	GtkLabel  *label;
+	GtkDialog *dialog;
+	gboolean  timed_out;
+};
+
+static gboolean
+free_at_idle (gpointer data)
+{
+	g_free (data);
+	return FALSE;
+}
+
+static char*
+idle_free (char *str)
+{
+	g_idle_add (free_at_idle, str);
+	return str;
+}
+
+static char *
+timeout_string (int time)
+{
+	char *str = g_strdup_printf (ngettext ("Testing the new settings. If you don't respond in %d second the previous settings will be restored.", "Testing the new settings. If you don't respond in %d seconds the previous settings will be restored.", time), time);
+
+	return idle_free (str);
+}
+
+static gboolean
+save_timeout_callback (gpointer data)
+{
+	struct TimeoutData *timeData = data;
+
+	timeData->time--;
+
+	if (timeData->time == 0)
+	{
+		gtk_dialog_response (timeData->dialog, GTK_RESPONSE_NO);
+		timeData->timed_out = TRUE;
+		return FALSE;
+	}
+
+	gtk_label_set_text (timeData->label, timeout_string (timeData->time));
+
+	return TRUE;
+}
+
+static gboolean
+run_timed_dialog (AppearanceData *app)
+{
+	GtkWidget	   *dialog;
+	GtkWidget	   *hbox;
+	GtkWidget	   *vbox;
+	GtkWidget	   *label;
+	GtkWidget	   *label_sec;
+	GtkWidget	   *image;
+	int		   res;
+	struct TimeoutData timeout_data;
+	guint		   timeout;
+
+	dialog = gtk_dialog_new ();
+	gtk_window_set_transient_for (GTK_WINDOW (dialog),
+				      GTK_WINDOW (app->dialog));
+	gtk_window_set_destroy_with_parent (GTK_WINDOW (dialog), TRUE);
+	gtk_window_set_modal (GTK_WINDOW (dialog), TRUE);
+	gtk_container_set_border_width (GTK_CONTAINER (dialog), 12);
+	gtk_dialog_set_has_separator (GTK_DIALOG (dialog), FALSE);
+	gtk_window_set_title (GTK_WINDOW (dialog), _("Keep Settings"));
+	gtk_window_set_position (GTK_WINDOW(dialog), GTK_WIN_POS_CENTER_ALWAYS);
+
+	label = gtk_label_new (NULL);
+	gtk_label_set_markup (GTK_LABEL (label),
+			      idle_free (g_strdup_printf ("<b>%s</b>",
+							  _("Do you want to keep these settings?"))));
+	image = gtk_image_new_from_stock (GTK_STOCK_DIALOG_QUESTION,
+					  GTK_ICON_SIZE_DIALOG);
+	gtk_misc_set_alignment (GTK_MISC (image), 0.5, 0.0);
+
+	gtk_label_set_line_wrap (GTK_LABEL (label), TRUE);
+	gtk_label_set_selectable (GTK_LABEL (label), TRUE);
+	gtk_misc_set_alignment (GTK_MISC (label), 0.0, 0.5);
+
+	label_sec = gtk_label_new (timeout_string (REVERT_COUNT));
+	gtk_label_set_line_wrap (GTK_LABEL (label_sec), TRUE);
+	gtk_label_set_selectable (GTK_LABEL (label_sec), TRUE);
+	gtk_misc_set_alignment (GTK_MISC (label_sec), 0.0, 0.5);
+
+	hbox = gtk_hbox_new (FALSE, 6);
+	vbox = gtk_vbox_new (FALSE, 6);
+
+	gtk_box_pack_start (GTK_BOX (vbox), label, TRUE, TRUE, 0);
+	gtk_box_pack_start (GTK_BOX (vbox), label_sec, TRUE, TRUE, 0);
+	gtk_box_pack_start (GTK_BOX (hbox), image, FALSE, FALSE, 0);
+	gtk_box_pack_start (GTK_BOX (hbox), vbox, TRUE, TRUE, 0);
+	gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dialog)->vbox),
+			    hbox,
+			    FALSE,
+			    FALSE,
+			    0);
+	gtk_dialog_add_buttons (GTK_DIALOG (dialog),
+				_("Use _previous settings"),
+				GTK_RESPONSE_NO,
+				_("_Keep settings"),
+				GTK_RESPONSE_YES,
+				NULL);
+
+	gtk_widget_show_all (hbox);
+
+	timeout_data.time = REVERT_COUNT;
+	timeout_data.label = GTK_LABEL (label_sec);
+	timeout_data.dialog = GTK_DIALOG (dialog);
+	timeout_data.timed_out = FALSE;
+
+	timeout = gdk_threads_add_timeout (1000, save_timeout_callback, &timeout_data);
+	res = gtk_dialog_run (GTK_DIALOG (dialog));
+
+	if (!timeout_data.timed_out)
+		g_source_remove (timeout);
+
+	gtk_widget_destroy (dialog);
+
+	return (res == GTK_RESPONSE_YES);
+}
+
+static gboolean
+show_dialog_timeout (gpointer data)
+{
+	TimedDialogInfo	*info = data;
+	gboolean	has_compiz;
+
+	gtk_window_present (GTK_WINDOW (info->app->dialog));
+
+	has_compiz = compiz_started ();
+
+	if (has_compiz ||
+	    g_timer_elapsed (info->timer,
+	    		     NULL) > SECONDS_WE_WILL_WAIT_FOR_COMPIZ_TO_START)
+	{
+		if (has_compiz)
+		{
+			set_busy (info->app->dialog, FALSE);
+
+			if (run_timed_dialog (info->app))
+				apply_settings (info->app,
+						info->app->desktop_effects_level >= 1);
+			else
+				gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (info->button),
+							      TRUE);
+		}
+		else
+		{
+			GtkWidget *dialog;
+
+			gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (info->button),
+						      TRUE);
+
+			set_busy (info->app->dialog, FALSE);
+
+			dialog = gtk_message_dialog_new ((GtkWindow*) info->app->dialog,
+							 GTK_DIALOG_DESTROY_WITH_PARENT,
+							 GTK_MESSAGE_WARNING,
+							 GTK_BUTTONS_OK,
+							 _("Desktop effects could not be enabled"));
+
+			gtk_window_set_title (GTK_WINDOW (dialog), "");
+			gtk_dialog_run (GTK_DIALOG (dialog));
+			gtk_widget_destroy (dialog);
+		}
+
+		gtk_widget_set_sensitive (info->app->dialog, TRUE);
+
+		g_timer_destroy (info->timer);
+		g_free (info);
+
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+static gboolean
+start_compiz (AppearanceData *app,
+	      GError **err)
+{
+	if (!g_spawn_command_line_async ("compiz --replace", err))
+		return FALSE;
+
+	app->compiz_running = TRUE;
+
+	return TRUE;
+}
+
+static gboolean
+start_metacity (AppearanceData *app, GError **err)
+{
+	if (!g_spawn_command_line_async ("metacity --replace", err))
+		return FALSE;
+
+	app->compiz_running = FALSE;
+
+	return TRUE;
+}
+
+static gboolean
+has_composite ()
+{
+	int dummy1;
+	int dummy2;
+
+	if (XCompositeQueryExtension (GDK_DISPLAY (), &dummy1, &dummy2))
+		return TRUE;
+
+	return FALSE;
+}
+
+static void
+show_alert (const char *text)
+{
+	GtkWidget *dialog;
+
+	dialog = gtk_message_dialog_new (NULL,
+					 GTK_DIALOG_MODAL,
+					 GTK_MESSAGE_ERROR,
+					 GTK_BUTTONS_OK,
+					 "%s",					 
+					 text);
+
+	gtk_dialog_run (GTK_DIALOG (dialog));
+}
+
+static gboolean
+are_effects_enabled (AppearanceData* app,
+		     const gchar**   effects_list)
+{
+	int	 i;
+	gboolean res = TRUE;
+	GError	 *tmp = NULL;
+	GSList	 *plugins;
+
+	plugins = get_plugins (app, &tmp);
+	for (i = 0; effects_list[i] != NULL; i++)
+		res &= contains_string (plugins, effects_list[i]);
+
+	return res;
+}
+
+static gboolean
+reset_plugins (AppearanceData *app)
+{
+	GError *error = NULL;
+
+	return gconf_client_unset (app->client, PLUGIN_LIST_KEY, &error);
+}
+
+static gboolean
+are_normal_effects_enabled (AppearanceData *app)
+{
+   gboolean res = TRUE;
+   GError *err = NULL;
+   GSList *plugins, *default_plugins;
+
+   default_plugins = gconf_value_get_list ( gconf_client_get_default_from_schema (app->client,  PLUGIN_LIST_KEY, &err));
+
+   err = NULL;
+   plugins = get_plugins (app, &err);
+   for(;default_plugins; default_plugins = g_slist_next(default_plugins))
+      res &= contains_string(plugins, gconf_value_get_string(default_plugins->data));
+
+   return res;
+}
+
+static gboolean
+are_extra_effects_enabled (AppearanceData *app)
+{
+   return (are_effects_enabled (app, extra_effects) && 
+	   are_normal_effects_enabled (app));
+}
+
+static gint
+get_effects_level (AppearanceData *data)
+{
+	if (data->compiz_running)
+	{
+	        if (are_extra_effects_enabled (data))
+		        return EXTRA_EFFECTS;
+		else if (are_normal_effects_enabled (data))
+			return NORMAL_EFFECTS;
+		else
+			return CUSTOM_EFFECTS;
+        }
+        else
+		return NO_EFFECTS;       
+}
+
+static gboolean
+enable_normal_effects (AppearanceData* app)
+{
+   return reset_plugins (app);
+}
+
+static gboolean
+enable_extra_effects (AppearanceData* app)
+{
+	GError	*err = NULL;
+	GSList	*plugins = NULL;
+	int	i;
+
+	reset_plugins (app);
+
+	plugins = get_plugins (app, &err);
+	for (i = 0; extra_effects[i] != NULL; i++)
+		plugins = g_slist_append (plugins,
+					  (gchar*) extra_effects[i]);
+
+	err = NULL;
+	gconf_client_set_list (app->client,
+			       PLUGIN_LIST_KEY,
+			       GCONF_VALUE_STRING,
+			       plugins,
+			       &err);
+
+	return TRUE;
+}
+
+static void
+on_effects_toggle (GtkWidget *widget,
+		   gpointer  user_data)
+{
+	AppearanceData	*appdata = user_data;
+	GtkWidget	*previously_selected_button;
+	static gint	old_effects_level;
+	static gboolean	do_init = TRUE;
+	gint		i;
+	GError		*err = NULL;
+
+	if (do_init == TRUE)
+	{
+		old_effects_level = get_effects_level (appdata);
+		do_init = FALSE;
+	}
+
+	if (!gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (widget))) 
+		return;
+
+	previously_selected_button = appearance_capplet_get_widget (appdata,
+							   								effect_choices [old_effects_level]);
+
+	/* Look for the button which has been selected */
+	for (i = 0; i < G_N_ELEMENTS (effect_choices); i++) 
+	{
+		if (widget == appearance_capplet_get_widget (appdata,
+						   							effect_choices [i]))
+			break;
+	}
+
+	appdata->desktop_effects_level = i;
+
+	if (appdata->desktop_effects_level >= 1)
+	{		
+		if (old_effects_level == 0 && check_graphics_driver())
+		{
+			show_info (_("Please run \"Appearance/Desktop Effects\" again after restarting "
+				     "the computer, when the new graphics driver is active."));
+			g_signal_handlers_block_by_func (widget,
+							 on_effects_toggle,
+							 appdata);
+			gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (appearance_capplet_get_widget (appdata,
+						      			effect_choices [old_effects_level])),
+						      			TRUE);
+			g_signal_handlers_unblock_by_func (widget,
+							   on_effects_toggle,
+							   appdata);
+			return;
+		}
+
+		if (!has_composite ())
+		{
+			show_alert ("The Composite extension is not available");
+			return;
+		}
+
+		if (old_effects_level == 0)
+			start_compiz (appdata, &err);
+