Use new DBus API to show the current image in the file browser

This improves the functionality implemented with commit 9df5fd43.
The new API that will be included in Nautilus 3.3.4 not only opens a
view for the containing folder but also marks the image in the view.
The old behaviour is still available as fallback if the new API is
not offered on the system.

https://bugzilla.gnome.org/show_bug.cgi?id=650402

origin commit:
https://git.gnome.org/browse/eog/commit/?h=gnome-3-4&id=fa74473

Author: fxri

src/eom-util.c

@@ -343,3 +343,89 @@ eom_util_file_is_persistent (GFile *file)
 
 	return TRUE;
 }
+
+static void
+_eom_util_show_file_in_filemanager_fallback (GFile *file, GdkScreen *screen)
+{
+	gchar *uri = NULL;
+	GError *error = NULL;
+	guint32 timestamp = gtk_get_current_event_time ();
+
+	if (g_file_query_file_type (file, 0, NULL) == G_FILE_TYPE_DIRECTORY) {
+		uri = g_file_get_uri (file);
+	} else {
+		/* If input file is not a directory we must open it's
+		   folder/parent to avoid opening the file itself     */
+		GFile *parent_file;
+
+		parent_file = g_file_get_parent (file);
+		if (G_LIKELY (parent_file))
+			uri = g_file_get_uri (parent_file);
+		g_object_unref (parent_file);
+	}
+
+	if (uri && !gtk_show_uri (screen, uri, timestamp, &error)) {
+		g_warning ("Couldn't show containing folder \"%s\": %s", uri,
+			   error->message);
+		g_error_free (error);
+	}
+
+	g_free (uri);
+}
+
+void
+eom_util_show_file_in_filemanager (GFile *file, GdkScreen *screen)
+{
+	GDBusProxy *proxy;
+	gboolean done = FALSE;
+
+	g_return_if_fail (file != NULL);
+
+	proxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SESSION,
+				G_DBUS_PROXY_FLAGS_DO_NOT_CONNECT_SIGNALS |
+				G_DBUS_PROXY_FLAGS_DO_NOT_LOAD_PROPERTIES,
+				NULL, "org.freedesktop.FileManager1",
+				"/org/freedesktop/FileManager1",
+				"org.freedesktop.FileManager1",
+				NULL, NULL);
+
+	if (proxy) {
+		gchar *uri = g_file_get_uri (file);
+		gchar *startup_id;
+		GVariant *params, *result;
+		GVariantBuilder builder;
+
+		g_variant_builder_init (&builder,
+					G_VARIANT_TYPE ("as"));
+		g_variant_builder_add (&builder, "s", uri);
+
+		/* This seems to be the expected format, as other values
+		   cause the filemanager window not to get focus. */
+		startup_id = g_strdup_printf("_TIME%u",
+					     gtk_get_current_event_time());
+
+		/* params is floating! */
+		params = g_variant_new ("(ass)", &builder, startup_id);
+
+		g_free (startup_id);
+		g_variant_builder_clear (&builder);
+
+		/* Floating params-GVariant is consumed here */
+		result = g_dbus_proxy_call_sync (proxy, "ShowItems",
+						 params, G_DBUS_CALL_FLAGS_NONE,
+						 -1, NULL, NULL);
+
+		/* Receiving a non-NULL result counts as a successful call. */
+		if (G_LIKELY (result != NULL)) {
+			done = TRUE;
+			g_variant_unref (result);
+		}
+
+		g_free (uri);
+		g_object_unref (proxy);
+	}
+
+	/* Fallback to gtk_show_uri() if launch over DBus is not possible */
+	if (!done)
+		_eom_util_show_file_in_filemanager_fallback (file, screen);
+}

src/eom-util.h

@@ -63,6 +63,10 @@ char *  eom_util_filename_get_extension      (const char * filename_with_extensi
 G_GNUC_INTERNAL
 gboolean eom_util_file_is_persistent (GFile *file);
 
+G_GNUC_INTERNAL
+void     eom_util_show_file_in_filemanager   (GFile *file,
+					      GdkScreen *screen);
+
 G_END_DECLS
 
 #endif /* __EOM_UTIL_H__ */

src/eom-window.c

@@ -2956,49 +2956,21 @@ eom_window_cmd_save_as (GtkAction *action, gpointer user_data)
 static void
 eom_window_cmd_open_containing_folder (GtkAction *action, gpointer user_data)
 {
-	EomWindow *window = EOM_WINDOW (user_data);
 	EomWindowPrivate *priv;
 
-	GtkWidget *eom_window_widget;
-  
 	GFile *file;
-	GFile *parent = NULL;
-	
-	eom_window_widget = GTK_WIDGET (window);	
-	priv = window->priv;
+	g_return_if_fail (EOM_IS_WINDOW (user_data));
+
+	priv = EOM_WINDOW (user_data)->priv;
 
 	g_return_if_fail (priv->image != NULL);	
 
 	file = eom_image_get_file (priv->image);
 
-	if (file) {
-		parent = g_file_get_parent (file);
-		g_object_unref(file);
-	}
-
-	if (parent) {
-		char *parent_uri;
+	g_return_if_fail (file != NULL);
 
-		parent_uri = g_file_get_uri (parent);
-		if (parent_uri) {
-			GdkScreen *screen;
-			guint32 timestamp;
-			GError *error;
-
-			screen = gtk_widget_get_screen (eom_window_widget);
-			timestamp = gtk_get_current_event_time ();
-
-			error = NULL;
-			if (!gtk_show_uri (screen, parent_uri, timestamp, &error)) {
-				eom_debug_message (DEBUG_WINDOW, "Could not open the containing folder");
-				g_error_free (error);
-			}
-
-			g_free (parent_uri);
-		}
-
-		g_object_unref(parent);
-	}
+	eom_util_show_file_in_filemanager (file,
+				gtk_widget_get_screen (GTK_WIDGET (user_data)));
 }
 
 static void