fix more GdkScreen related deprecations

This is a follow-up to 5d4416a to fix #152

Author: XRevan86

src/gs-manager.c

@@ -1268,11 +1268,8 @@ apply_background_to_window (GSManager *manager,
                             GSWindow  *window)
 {
 	cairo_surface_t *surface;
-	GdkDisplay      *display;
-	GdkScreen       *screen;
 	int              width;
 	int              height;
-	gint             scale;
 
         mate_bg_load_from_preferences (manager->priv->bg);
 
@@ -1282,11 +1279,8 @@ apply_background_to_window (GSManager *manager,
 		gs_window_set_background_surface (window, NULL);
 	}
 
-	display = gs_window_get_display (window);
-	screen = gdk_display_get_default_screen (display);
-	scale = gdk_window_get_scale_factor (gdk_screen_get_root_window (screen));
-	width = WidthOfScreen (gdk_x11_screen_get_xscreen (screen)) / scale;
-	height = HeightOfScreen (gdk_x11_screen_get_xscreen (screen)) / scale;
+	gtk_widget_get_preferred_width (GTK_WIDGET (window), &width, NULL);
+	gtk_widget_get_preferred_height (GTK_WIDGET (window), &height, NULL);
 	gs_debug ("Creating background w:%d h:%d", width, height);
 	surface = mate_bg_create_surface (manager->priv->bg,
 	                                  gs_window_get_gdk_window (window),
@@ -1563,84 +1557,73 @@ gs_manager_create_window_for_monitor (GSManager  *manager,
 }
 
 static void
-on_screen_monitors_changed (GdkScreen *screen,
-                            GSManager *manager)
+on_display_monitor_added (GdkDisplay *display,
+                          GdkMonitor *monitor,
+                          GSManager  *manager)
 {
 	GSList     *l;
-	GdkDisplay *display;
 	int         n_monitors;
-	int         n_windows;
-	int         i;
 
-	display = gdk_screen_get_display (screen);
 	n_monitors = gdk_display_get_n_monitors (display);
-	n_windows = g_slist_length (manager->priv->windows);
 
-	gs_debug ("Monitors changed for display %s: num=%d",
-	          gdk_display_get_name (display),
-	          n_monitors);
+	gs_debug ("Monitor added on display %s, now there are %d",
+	          gdk_display_get_name (display), n_monitors);
 
-	if (n_monitors > n_windows)
+	/* Tear down the unlock dialog in case we want to move it
+	 * to the new monitor
+	 */
+	l = manager->priv->windows;
+	while (l != NULL)
 	{
+		gs_window_cancel_unlock_request (GS_WINDOW (l->data));
+		l = l->next;
+	}
 
-		/* Tear down unlock dialog in case we want to move it
-		 * to a new monitor
-		 */
-		l = manager->priv->windows;
-		while (l != NULL)
-		{
-			gs_window_cancel_unlock_request (GS_WINDOW (l->data));
-			l = l->next;
-		}
+	/* add a new window */
+	gs_manager_create_window_for_monitor (manager, monitor);
 
-		/* add more windows */
-		for (i = n_windows; i < n_monitors; i++)
-		{
-			GdkMonitor *mon = gdk_display_get_monitor (display, i);
-			gs_manager_create_window_for_monitor (manager, mon);
-		}
+	/* and put unlock dialog up whereever it's supposed to be */
+	gs_manager_request_unlock (manager);
+}
 
-		/* And put unlock dialog up where ever it's supposed to be
-		 */
-		gs_manager_request_unlock (manager);
-	}
-	else
-	{
+static void
+on_display_monitor_removed (GdkDisplay *display,
+                            GdkMonitor *monitor,
+                            GSManager  *manager)
+{
+	GSList     *l;
+	int         n_monitors;
 
-		gdk_x11_grab_server ();
+	n_monitors = gdk_display_get_n_monitors (display);
 
-		/* remove the extra windows */
-		l = manager->priv->windows;
-		while (l != NULL)
-		{
-			GdkDisplay *this_display;
-			GdkMonitor *this_monitor;
-			GSList     *next = l->next;
-
-			this_display = gs_window_get_display (GS_WINDOW (l->data));
-			this_monitor = gs_window_get_monitor (GS_WINDOW (l->data));
-			if (this_display == display &&
-			    !GDK_IS_MONITOR (this_monitor))
-			{
-				manager_maybe_stop_job_for_window (manager, GS_WINDOW (l->data));
-				g_hash_table_remove (manager->priv->jobs, l->data);
-				gs_window_destroy (GS_WINDOW (l->data));
-				manager->priv->windows = g_slist_delete_link (manager->priv->windows, l);
-			}
-			l = next;
-		}
+	gs_debug ("Monitor removed on display %s, now there are %d",
+	          gdk_display_get_name (display), n_monitors);
 
-		/* make sure there is a lock dialog on a connected monitor,
-		 * and that the keyboard is still properly grabbed after all
-		 * the windows above got destroyed*/
-		if (n_windows > n_monitors)
+	gdk_x11_grab_server ();
+
+	/* remove the now extra window */
+	l = manager->priv->windows;
+	while (l != NULL)
+	{
+		GdkDisplay *this_display;
+		GdkMonitor *this_monitor;
+		GSList     *next = l->next;
+
+		this_display = gs_window_get_display (GS_WINDOW (l->data));
+		this_monitor = gs_window_get_monitor (GS_WINDOW (l->data));
+		if (this_display == display && this_monitor == monitor)
 		{
-			gs_manager_request_unlock (manager);
+			manager_maybe_stop_job_for_window (manager,
+			                                   GS_WINDOW (l->data));
+			g_hash_table_remove (manager->priv->jobs, l->data);
+			gs_window_destroy (GS_WINDOW (l->data));
+			manager->priv->windows = g_slist_delete_link (manager->priv->windows, l);
 		}
-
-		gdk_flush ();
-		gdk_x11_ungrab_server ();
+		l = next;
 	}
+
+	gdk_display_flush (display);
+	gdk_x11_ungrab_server ();
 }
 
 static void
@@ -1659,8 +1642,11 @@ gs_manager_destroy_windows (GSManager *manager)
 
 	display = gdk_display_get_default ();
 
-	g_signal_handlers_disconnect_by_func (gdk_display_get_default_screen (display),
-	                                      on_screen_monitors_changed,
+	g_signal_handlers_disconnect_by_func (display,
+	                                      on_display_monitor_removed,
+	                                      manager);
+	g_signal_handlers_disconnect_by_func (display,
+	                                      on_display_monitor_added,
 	                                      manager);
 
 	for (l = manager->priv->windows; l; l = l->next)
@@ -1753,9 +1739,11 @@ gs_manager_create_windows (GSManager *manager)
 	g_assert (manager->priv->windows == NULL);
 
 	display = gdk_display_get_default ();
-	g_signal_connect (gdk_display_get_default_screen (display),
-	                  "monitors-changed",
-	                  G_CALLBACK (on_screen_monitors_changed),
+	g_signal_connect (display, "monitor-added",
+	                  G_CALLBACK (on_display_monitor_added),
+	                  manager);
+	g_signal_connect (display, "monitor-removed",
+	                  G_CALLBACK (on_display_monitor_removed),
 	                  manager);
 
 	gs_manager_create_windows_for_display (manager, display);