[src] don't use GtkObject (GTK3)

the ::destroy signal of GtkObject has only been moved to GtkWidget in GTK3
(after GtkObject removal): http://developer.gnome.org/gtk3/3.0/ch25s02.html
So we use conditionals in this case, to keep it working with GTK2.

A tad similar:
http://git.gnome.org/browse/nautilus/commit/?id=cc6cb51e827c0b15d4ef09f12d37b9f331ddcef8

18 files changed, 142 insertions, 81 deletions

diff --git a/src/caja-application.c b/src/caja-application.c
index a462524f..978af2d6 100644
--- a/src/caja-application.c
+++ b/src/caja-application.c
@@ -432,7 +432,7 @@ check_required_directories (CajaApplication *application)
 
         dialog = eel_show_error_dialog (error_string, detail_string, NULL);
         /* We need the main event loop so the user has a chance to see the dialog. */
-        caja_main_event_loop_register (GTK_OBJECT (dialog));
+        caja_main_event_loop_register (GTK_WIDGET (dialog));
 
         g_string_free (directories_as_string, TRUE);
         g_free (error_string);
@@ -1346,7 +1346,11 @@ caja_application_close_all_spatial_windows (void)
 }
 
 static void
+#if GTK_CHECK_VERSION (3, 0, 0)
+caja_application_destroyed_window (GtkWidget *object, CajaApplication *application)
+#else
 caja_application_destroyed_window (GtkObject *object, CajaApplication *application)
+#endif
 {
     caja_application_window_list = g_list_remove (caja_application_window_list, object);
 }
diff --git a/src/caja-bookmarks-window.c b/src/caja-bookmarks-window.c
index 2ce15aae..4b13a1ee 100644
--- a/src/caja-bookmarks-window.c
+++ b/src/caja-bookmarks-window.c
@@ -229,9 +229,9 @@ static void
 edit_bookmarks_dialog_reset_signals (gpointer data,
                                      GObject *obj)
 {
-    g_signal_handler_disconnect (GTK_OBJECT (jump_button),
+    g_signal_handler_disconnect (jump_button,
                                  jump_button_signal_id);
-    g_signal_handler_disconnect (GTK_OBJECT (bookmark_list_widget),
+    g_signal_handler_disconnect (bookmark_list_widget,
                                  row_activated_signal_id);
     jump_button_signal_id =
         g_signal_connect (jump_button, "clicked",
@@ -415,9 +415,9 @@ void
 edit_bookmarks_dialog_set_signals (CajaWindow *window)
 {
 
-    g_signal_handler_disconnect (GTK_OBJECT (jump_button),
+    g_signal_handler_disconnect (jump_button,
                                  jump_button_signal_id);
-    g_signal_handler_disconnect (GTK_OBJECT (bookmark_list_widget),
+    g_signal_handler_disconnect (bookmark_list_widget,
                                  row_activated_signal_id);
 
     jump_button_signal_id =
diff --git a/src/caja-location-bar.c b/src/caja-location-bar.c
index 6fdc34e5..428f26a1 100644
--- a/src/caja-location-bar.c
+++ b/src/caja-location-bar.c
@@ -356,7 +356,11 @@ finalize (GObject *object)
 }
 
 static void
+#if GTK_CHECK_VERSION (3, 0, 0)
+destroy (GtkWidget *object)
+#else
 destroy (GtkObject *object)
+#endif
 {
     CajaLocationBar *bar;
 
@@ -372,21 +376,25 @@ destroy (GtkObject *object)
     g_free (bar->details->last_location);
     bar->details->last_location = NULL;
 
+#if GTK_CHECK_VERSION (3, 0, 0)
+    EEL_CALL_PARENT (GTK_WIDGET_CLASS, destroy, (object));
+#else
     EEL_CALL_PARENT (GTK_OBJECT_CLASS, destroy, (object));
+#endif
 }
 
 static void
 caja_location_bar_class_init (CajaLocationBarClass *class)
 {
-    GObjectClass *gobject_class;
-    GtkObjectClass *object_class;
     CajaNavigationBarClass *navigation_bar_class;
 
-    gobject_class = G_OBJECT_CLASS (class);
-    gobject_class->finalize = finalize;
+    G_OBJECT_CLASS (class)->finalize = finalize;
 
-    object_class = GTK_OBJECT_CLASS (class);
-    object_class->destroy = destroy;
+#if GTK_CHECK_VERSION (3, 0, 0)
+    GTK_WIDGET_CLASS (class)->destroy = destroy;
+#else
+    GTK_OBJECT_CLASS (class)->destroy = destroy;
+#endif
 
     navigation_bar_class = CAJA_NAVIGATION_BAR_CLASS (class);
 
diff --git a/src/caja-location-dialog.c b/src/caja-location-dialog.c
index 99596b87..ec102300 100644
--- a/src/caja-location-dialog.c
+++ b/src/caja-location-dialog.c
@@ -62,16 +62,6 @@ caja_location_dialog_finalize (GObject *object)
 }
 
 static void
-caja_location_dialog_destroy (GtkObject *object)
-{
-    CajaLocationDialog *dialog;
-
-    dialog = CAJA_LOCATION_DIALOG (object);
-
-    EEL_CALL_PARENT (GTK_OBJECT_CLASS, destroy, (object));
-}
-
-static void
 open_current_location (CajaLocationDialog *dialog)
 {
     GFile *location;
@@ -136,14 +126,7 @@ entry_activate_callback (GtkEntry *entry,
 static void
 caja_location_dialog_class_init (CajaLocationDialogClass *class)
 {
-    GObjectClass *gobject_class;
-    GtkObjectClass *object_class;
-
-    gobject_class = G_OBJECT_CLASS (class);
-    gobject_class->finalize = caja_location_dialog_finalize;
-
-    object_class = GTK_OBJECT_CLASS (class);
-    object_class->destroy = caja_location_dialog_destroy;
+    G_OBJECT_CLASS (class)->finalize = caja_location_dialog_finalize;
 }
 
 static void
diff --git a/src/caja-location-entry.c b/src/caja-location-entry.c
index f23f1a9f..0a59a347 100644
--- a/src/caja-location-entry.c
+++ b/src/caja-location-entry.c
@@ -285,7 +285,11 @@ finalize (GObject *object)
 }
 
 static void
+#if GTK_CHECK_VERSION (3, 0, 0)
+destroy (GtkWidget *object)
+#else
 destroy (GtkObject *object)
+#endif
 {
     CajaLocationEntry *entry;
 
@@ -301,7 +305,11 @@ destroy (GtkObject *object)
     g_free (entry->details->current_directory);
     entry->details->current_directory = NULL;
 
+#if GTK_CHECK_VERSION (3, 0, 0)
+    EEL_CALL_PARENT (GTK_WIDGET_CLASS, destroy, (object));
+#else
     EEL_CALL_PARENT (GTK_OBJECT_CLASS, destroy, (object));
+#endif
 }
 
 static void
@@ -382,22 +390,17 @@ caja_location_entry_activate (GtkEntry *entry)
 static void
 caja_location_entry_class_init (CajaLocationEntryClass *class)
 {
-    GtkWidgetClass *widget_class;
-    GObjectClass *gobject_class;
-    GtkObjectClass *object_class;
-    GtkEntryClass *entry_class;
+    GTK_WIDGET_CLASS (class)->focus_in_event = caja_location_entry_focus_in;
 
-    widget_class = GTK_WIDGET_CLASS (class);
-    widget_class->focus_in_event = caja_location_entry_focus_in;
+#if GTK_CHECK_VERSION (3, 0, 0)
+    GTK_WIDGET_CLASS (class)->destroy = destroy;
+#else
+    GTK_OBJECT_CLASS (class)->destroy = destroy;
+#endif
 
-    gobject_class = G_OBJECT_CLASS (class);
-    gobject_class->finalize = finalize;
+    G_OBJECT_CLASS (class)->finalize = finalize;
 
-    object_class = GTK_OBJECT_CLASS (class);
-    object_class->destroy = destroy;
-
-    entry_class = GTK_ENTRY_CLASS (class);
-    entry_class->activate = caja_location_entry_activate;
+    GTK_ENTRY_CLASS (class)->activate = caja_location_entry_activate;
 }
 
 void
diff --git a/src/caja-main.c b/src/caja-main.c
index ef5714b2..3a99163f 100644
--- a/src/caja-main.c
+++ b/src/caja-main.c
@@ -101,7 +101,7 @@ static void eel_gtk_main_quit_all (void)
     g_idle_add (quit_if_in_main_loop, NULL);
 }
 
-static void event_loop_unregister (GtkObject *object)
+static void event_loop_unregister (GtkWidget *object)
 {
     event_loop_registrants = g_slist_remove (event_loop_registrants, object);
     
@@ -111,13 +111,17 @@ static void event_loop_unregister (GtkObject *object)
     }
 }
 
+#if GTK_CHECK_VERSION(3, 0, 0)
+void caja_main_event_loop_register (GtkWidget *object)
+#else
 void caja_main_event_loop_register (GtkObject *object)
+#endif
 {
     g_signal_connect (object, "destroy", G_CALLBACK (event_loop_unregister), NULL);
-    event_loop_registrants = g_slist_prepend (event_loop_registrants, object);
+    event_loop_registrants = g_slist_prepend (event_loop_registrants, GTK_WIDGET (object));
 }
 
-gboolean caja_main_is_event_loop_mainstay (GtkObject *object)
+gboolean caja_main_is_event_loop_mainstay (GtkWidget *object)
 {
     return g_slist_length (event_loop_registrants) == 1
            && event_loop_registrants->data == object;
@@ -148,7 +152,7 @@ void caja_main_event_loop_quit (gboolean explicit)
     }
     while (event_loop_registrants != NULL)
     {
-        gtk_object_destroy (event_loop_registrants->data);
+        gtk_widget_destroy (event_loop_registrants->data);
     }
 }
 
diff --git a/src/caja-main.h b/src/caja-main.h
index c3ddf82a..abb9e6a7 100644
--- a/src/caja-main.h
+++ b/src/caja-main.h
@@ -29,8 +29,12 @@
 
 #include <gtk/gtk.h>
 
+#if GTK_CHECK_VERSION(3, 0, 0)
+void     caja_main_event_loop_register    (GtkWidget *object);
+#else
 void     caja_main_event_loop_register    (GtkObject *object);
-gboolean caja_main_is_event_loop_mainstay (GtkObject *object);
+#endif
+gboolean caja_main_is_event_loop_mainstay (GtkWidget *object);
 void     caja_main_event_loop_quit        (gboolean explicit);
 
 #endif /* CAJA_MAIN_H */
diff --git a/src/caja-navigation-bar.c b/src/caja-navigation-bar.c
index c71d6503..89cd0e20 100644
--- a/src/caja-navigation-bar.c
+++ b/src/caja-navigation-bar.c
@@ -54,14 +54,11 @@ EEL_IMPLEMENT_MUST_OVERRIDE_SIGNAL (caja_navigation_bar, set_location)
 static void
 caja_navigation_bar_class_init (CajaNavigationBarClass *klass)
 {
-    GtkObjectClass *object_class;
     GtkBindingSet *binding_set;
 
-    object_class = GTK_OBJECT_CLASS (klass);
-
     signals[ACTIVATE] = g_signal_new
                         ("activate",
-                         G_TYPE_FROM_CLASS (object_class),
+                         G_TYPE_FROM_CLASS (klass),
                          G_SIGNAL_RUN_LAST,
                          G_STRUCT_OFFSET (CajaNavigationBarClass,
                                           activate),
@@ -71,7 +68,7 @@ caja_navigation_bar_class_init (CajaNavigationBarClass *klass)
 
     signals[CANCEL] = g_signal_new
                       ("cancel",
-                       G_TYPE_FROM_CLASS (object_class),
+                       G_TYPE_FROM_CLASS (klass),
                        G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
                        G_STRUCT_OFFSET (CajaNavigationBarClass,
                                         cancel),
@@ -81,7 +78,7 @@ caja_navigation_bar_class_init (CajaNavigationBarClass *klass)
 
     signals[LOCATION_CHANGED] = g_signal_new
                                 ("location_changed",
-                                 G_TYPE_FROM_CLASS (object_class),
+                                 G_TYPE_FROM_CLASS (klass),
                                  G_SIGNAL_RUN_LAST,
                                  G_STRUCT_OFFSET (CajaNavigationBarClass,
                                          location_changed),
diff --git a/src/caja-navigation-window-menus.c b/src/caja-navigation-window-menus.c
index 22c89c28..a9214476 100644
--- a/src/caja-navigation-window-menus.c
+++ b/src/caja-navigation-window-menus.c
@@ -116,7 +116,7 @@ forget_history_if_yes (GtkDialog *dialog, int response, gpointer callback_data)
     {
         caja_forget_history ();
     }
-    gtk_object_destroy (GTK_OBJECT (dialog));
+    gtk_widget_destroy (GTK_WIDGET (dialog));
 }
 
 static void
diff --git a/src/caja-navigation-window.c b/src/caja-navigation-window.c
index db9cf523..3cddcb26 100644
--- a/src/caja-navigation-window.c
+++ b/src/caja-navigation-window.c
@@ -593,7 +593,11 @@ caja_navigation_window_button_press_event (GtkWidget *widget,
 }
 
 static void
+#if GTK_CHECK_VERSION (3, 0, 0)
+caja_navigation_window_destroy (GtkWidget *object)
+#else
 caja_navigation_window_destroy (GtkObject *object)
+#endif
 {
     CajaNavigationWindow *window;
 
@@ -609,7 +613,11 @@ caja_navigation_window_destroy (GtkObject *object)
     window->details->content_paned = NULL;
     window->details->split_view_hpane = NULL;
 
+#if GTK_CHECK_VERSION (3, 0, 0)
+    GTK_WIDGET_CLASS (parent_class)->destroy (object);
+#else
     GTK_OBJECT_CLASS (parent_class)->destroy (object);
+#endif
 }
 
 static void
@@ -1243,7 +1251,11 @@ caja_navigation_window_class_init (CajaNavigationWindowClass *class)
     CAJA_WINDOW_CLASS (class)->bookmarks_placeholder = MENU_PATH_BOOKMARKS_PLACEHOLDER;
 
     G_OBJECT_CLASS (class)->finalize = caja_navigation_window_finalize;
+#if GTK_CHECK_VERSION (3, 0, 0)
+    GTK_WIDGET_CLASS (class)->destroy = caja_navigation_window_destroy;
+#else
     GTK_OBJECT_CLASS (class)->destroy = caja_navigation_window_destroy;
+#endif
     GTK_WIDGET_CLASS (class)->show = caja_navigation_window_show;
     GTK_WIDGET_CLASS (class)->unrealize = caja_navigation_window_unrealize;
     GTK_WIDGET_CLASS (class)->window_state_event = caja_navigation_window_state_event;
diff --git a/src/caja-pathbar.c b/src/caja-pathbar.c
index dffd63ee..b5504fc9 100644
--- a/src/caja-pathbar.c
+++ b/src/caja-pathbar.c
@@ -361,12 +361,10 @@ static void
 caja_path_bar_class_init (CajaPathBarClass *path_bar_class)
 {
     GObjectClass *gobject_class;
-    GtkObjectClass *object_class;
     GtkWidgetClass *widget_class;
     GtkContainerClass *container_class;
 
     gobject_class = (GObjectClass *) path_bar_class;
-    object_class = (GtkObjectClass *) path_bar_class;
     widget_class = (GtkWidgetClass *) path_bar_class;
     container_class = (GtkContainerClass *) path_bar_class;
 
@@ -388,7 +386,7 @@ caja_path_bar_class_init (CajaPathBarClass *path_bar_class)
 
     path_bar_signals [PATH_CLICKED] =
         g_signal_new ("path-clicked",
-                      G_OBJECT_CLASS_TYPE (object_class),
+                      G_OBJECT_CLASS_TYPE (path_bar_class),
                       G_SIGNAL_RUN_FIRST,
                       G_STRUCT_OFFSET (CajaPathBarClass, path_clicked),
                       NULL, NULL,
@@ -397,7 +395,7 @@ caja_path_bar_class_init (CajaPathBarClass *path_bar_class)
                       G_TYPE_FILE);
     path_bar_signals [PATH_SET] =
         g_signal_new ("path-set",
-                      G_OBJECT_CLASS_TYPE (object_class),
+                      G_OBJECT_CLASS_TYPE (path_bar_class),
                       G_SIGNAL_RUN_FIRST,
                       G_STRUCT_OFFSET (CajaPathBarClass, path_set),
                       NULL, NULL,
diff --git a/src/caja-window-bookmarks.c b/src/caja-window-bookmarks.c
index e2b6ec73..f96b823f 100644
--- a/src/caja-window-bookmarks.c
+++ b/src/caja-window-bookmarks.c
@@ -62,7 +62,7 @@ remove_bookmarks_for_uri_if_yes (GtkDialog *dialog, int response, gpointer callb
         caja_bookmark_list_delete_items_with_uri (window->details->bookmark_list, uri);
     }
 
-    gtk_object_destroy (GTK_OBJECT (dialog));
+    gtk_widget_destroy (GTK_WIDGET (dialog));
 }
 
 static void
diff --git a/src/caja-window-manage-views.c b/src/caja-window-manage-views.c
index f3e30f6a..aba56377 100644
--- a/src/caja-window-manage-views.c
+++ b/src/caja-window-manage-views.c
@@ -1313,13 +1313,13 @@ got_file_info_for_view_selection_callback (CajaFile *file,
                 }
                 else
                 {
-                    gtk_object_destroy (GTK_OBJECT (window));
+                    gtk_widget_destroy (GTK_WIDGET (window));
                 }
             }
             else
             {
                 /* Since this is a window, destroying it will also unref it. */
-                gtk_object_destroy (GTK_OBJECT (window));
+                gtk_widget_destroy (GTK_WIDGET (window));
             }
         }
         else
diff --git a/src/caja-window.c b/src/caja-window.c
index 13f45508..27e2852f 100644
--- a/src/caja-window.c
+++ b/src/caja-window.c
@@ -188,10 +188,14 @@ caja_window_init (CajaWindow *window)
     g_signal_connect_object (caja_signaller_get_current (), "popup_menu_changed",
                              G_CALLBACK (caja_window_load_extension_menus), window, G_CONNECT_SWAPPED);
 
+#if GTK_CHECK_VERSION(3, 0, 0)
+    gtk_quit_add_destroy (1, GTK_WIDGET (window));
+#else
     gtk_quit_add_destroy (1, GTK_OBJECT (window));
+#endif
 
     /* Keep the main event loop alive as long as the window exists */
-    caja_main_event_loop_register (GTK_OBJECT (window));
+    caja_main_event_loop_register (GTK_WIDGET (window));
 }
 
 /* Unconditionally synchronize the GtkUIManager of WINDOW. */
@@ -621,8 +625,11 @@ free_stored_viewers (CajaWindow *window)
     window->details->extra_viewer = NULL;
 }
 
-static void
+#if GTK_CHECK_VERSION (3, 0, 0)
+caja_window_destroy (GtkWidget *object)
+#else
 caja_window_destroy (GtkObject *object)
+#endif
 {
     CajaWindow *window;
     GList *panes_copy;
@@ -638,7 +645,11 @@ caja_window_destroy (GtkObject *object)
     g_assert (window->details->panes == NULL);
     g_assert (window->details->active_pane == NULL);
 
+#if GTK_CHECK_VERSION (3, 0, 0)
+    GTK_WIDGET_CLASS (caja_window_parent_class)->destroy (object);
+#else
     GTK_OBJECT_CLASS (caja_window_parent_class)->destroy (object);
+#endif
 }
 
 static void
@@ -2099,12 +2110,18 @@ caja_window_class_init (CajaWindowClass *class)
 {
     GtkBindingSet *binding_set;
 
-    G_OBJECT_CLASS (class)->finalize = caja_window_finalize;
     G_OBJECT_CLASS (class)->constructor = caja_window_constructor;
     G_OBJECT_CLASS (class)->constructed = caja_window_constructed;
     G_OBJECT_CLASS (class)->get_property = caja_window_get_property;
     G_OBJECT_CLASS (class)->set_property = caja_window_set_property;
+    G_OBJECT_CLASS (class)->finalize = caja_window_finalize;
+
+#if !GTK_CHECK_VERSION (3, 0, 0)
     GTK_OBJECT_CLASS (class)->destroy = caja_window_destroy;
+#else
+    GTK_WIDGET_CLASS (class)->destroy = caja_window_destroy;
+#endif
+
     GTK_WIDGET_CLASS (class)->show = caja_window_show;
     GTK_WIDGET_CLASS (class)->size_request = caja_window_size_request;
     GTK_WIDGET_CLASS (class)->realize = caja_window_realize;
diff --git a/src/file-manager/fm-desktop-icon-view.c b/src/file-manager/fm-desktop-icon-view.c
index ef9a84de..005bc198 100644
--- a/src/file-manager/fm-desktop-icon-view.c
+++ b/src/file-manager/fm-desktop-icon-view.c
@@ -460,7 +460,8 @@ do_desktop_rescan (gpointer data)
 }
 
 static void
-done_loading (GtkObject *DirectoryView, FMDesktopIconView *desktop_icon_view)
+done_loading (CajaDirectory *model,
+	      FMDesktopIconView *desktop_icon_view)
 {
     struct stat buf;
 
diff --git a/src/file-manager/fm-directory-view.c b/src/file-manager/fm-directory-view.c
index bd75951e..a4119ec4 100644
--- a/src/file-manager/fm-directory-view.c
+++ b/src/file-manager/fm-directory-view.c
@@ -659,7 +659,7 @@ fm_directory_view_confirm_multiple (GtkWindow *parent_window,
 	g_free (detail);
 
 	response = gtk_dialog_run (dialog);
-	gtk_object_destroy (GTK_OBJECT (dialog));
+	gtk_widget_destroy (GTK_WIDGET (dialog));
 
 	return response == GTK_RESPONSE_YES;
 }
@@ -2096,7 +2096,11 @@ real_unmerge_menus (FMDirectoryView *view)
 }
 
 static void
+#if GTK_CHECK_VERSION (3, 0, 0)
+fm_directory_view_destroy (GtkWidget *object)
+#else
 fm_directory_view_destroy (GtkObject *object)
+#endif
 {
 	FMDirectoryView *view;
 	GList *node, *next;
@@ -2157,7 +2161,11 @@ fm_directory_view_destroy (GtkObject *object)
 		view->details->directory_as_file = NULL;
 	}
 
+#if GTK_CHECK_VERSION (3, 0, 0)
+	EEL_CALL_PARENT (GTK_WIDGET_CLASS, destroy, (object));
+#else
 	EEL_CALL_PARENT (GTK_OBJECT_CLASS, destroy, (object));
+#endif
 }
 
 static void
@@ -2168,17 +2176,17 @@ fm_directory_view_finalize (GObject *object)
 	view = FM_DIRECTORY_VIEW (object);
 
 	g_signal_handlers_disconnect_by_func (caja_preferences,
-										  schedule_update_menus_callback, view);
+        				      schedule_update_menus_callback, view);
 	g_signal_handlers_disconnect_by_func (caja_icon_view_preferences,
-										  text_attribute_names_changed_callback, view);
+        				      text_attribute_names_changed_callback, view);
 	g_signal_handlers_disconnect_by_func (caja_preferences,
-										  image_display_policy_changed_callback, view);
+        				      image_display_policy_changed_callback, view);
 	g_signal_handlers_disconnect_by_func (caja_preferences,
-										  click_policy_changed_callback, view);
+        				      click_policy_changed_callback, view);
 	g_signal_handlers_disconnect_by_func (caja_preferences,
-										  sort_directories_first_changed_callback, view);
+        				      sort_directories_first_changed_callback, view);
 	g_signal_handlers_disconnect_by_func (mate_lockdown_preferences,
-										  schedule_update_menus, view);
+        				      schedule_update_menus, view);
 
 	unschedule_pop_up_location_context_menu (view);
 	if (view->details->location_popup_event != NULL) {
@@ -2738,7 +2746,7 @@ copy_move_done_callback (GHashTable *debuting_files, gpointer data)
 			 * operate on. The ADD_FILE signal is registered as G_SIGNAL_RUN_LAST, so we
 			 * must use connect_after.
 			 */
-			g_signal_connect_data (GTK_OBJECT (directory_view),
+			g_signal_connect_data (directory_view,
 					       "add_file",
 					       G_CALLBACK (debuting_files_add_file_callback),
 					       debuting_files_data,
@@ -10794,11 +10802,13 @@ fm_directory_view_class_init (FMDirectoryViewClass *klass)
 	widget_class = GTK_WIDGET_CLASS (klass);
 	scrolled_window_class = GTK_SCROLLED_WINDOW_CLASS (klass);
 
-	G_OBJECT_CLASS (klass)->finalize = fm_directory_view_finalize;
 	G_OBJECT_CLASS (klass)->set_property = fm_directory_view_set_property;
-
+	G_OBJECT_CLASS (klass)->finalize = fm_directory_view_finalize;
+#if !GTK_CHECK_VERSION (3, 0, 0)
 	GTK_OBJECT_CLASS (klass)->destroy = fm_directory_view_destroy;
-
+#else
+	widget_class->destroy = fm_directory_view_destroy;
+#endif
 	widget_class->scroll_event = fm_directory_view_scroll_event;
 	widget_class->parent_set = fm_directory_view_parent_set;
 
diff --git a/src/file-manager/fm-icon-view.c b/src/file-manager/fm-icon-view.c
index eee45185..a9fb8b11 100644
--- a/src/file-manager/fm-icon-view.c
+++ b/src/file-manager/fm-icon-view.c
@@ -209,7 +209,11 @@ G_DEFINE_TYPE_WITH_CODE (FMIconView, fm_icon_view, FM_TYPE_DIRECTORY_VIEW,
                                  fm_icon_view_iface_init));
 
 static void
+#if GTK_CHECK_VERSION (3, 0, 0)
+fm_icon_view_destroy (GtkWidget *object)
+#else
 fm_icon_view_destroy (GtkObject *object)
+#endif
 {
     FMIconView *icon_view;
 
@@ -237,10 +241,13 @@ fm_icon_view_destroy (GtkObject *object)
         icon_view->details->icons_not_positioned = NULL;
     }
 
+#if GTK_CHECK_VERSION (3, 0, 0)
+    GTK_WIDGET_CLASS (fm_icon_view_parent_class)->destroy (object);
+#else
     GTK_OBJECT_CLASS (fm_icon_view_parent_class)->destroy (object);
+#endif
 }
 
-
 static void
 fm_icon_view_finalize (GObject *object)
 {
@@ -271,6 +278,7 @@ fm_icon_view_finalize (GObject *object)
     g_signal_handlers_disconnect_by_func (caja_compact_view_preferences,
                                           all_columns_same_width_changed_callback,
                                           icon_view);
+
     G_OBJECT_CLASS (fm_icon_view_parent_class)->finalize (object);
 }
 
@@ -2829,8 +2837,6 @@ fm_icon_view_sort_directories_first_changed (FMDirectoryView *directory_view)
     }
 }
 
-/* GtkObject methods. */
-
 static gboolean
 icon_view_can_accept_item (CajaIconContainer *container,
                            CajaFile *target_item,
@@ -3145,9 +3151,11 @@ fm_icon_view_class_init (FMIconViewClass *klass)
 
     G_OBJECT_CLASS (klass)->set_property = fm_icon_view_set_property;
     G_OBJECT_CLASS (klass)->finalize = fm_icon_view_finalize;
-
+#if !GTK_CHECK_VERSION (3, 0, 0)
     GTK_OBJECT_CLASS (klass)->destroy = fm_icon_view_destroy;
-
+#else
+    GTK_WIDGET_CLASS (klass)->destroy = fm_icon_view_destroy;
+#endif
     GTK_WIDGET_CLASS (klass)->screen_changed = fm_icon_view_screen_changed;
     GTK_WIDGET_CLASS (klass)->scroll_event = fm_icon_view_scroll_event;
 
diff --git a/src/file-manager/fm-properties-window.c b/src/file-manager/fm-properties-window.c
index bb9f06cd..19eea640 100644
--- a/src/file-manager/fm-properties-window.c
+++ b/src/file-manager/fm-properties-window.c
@@ -5482,7 +5482,11 @@ real_response (GtkDialog *dialog,
 }
 
 static void
+#if GTK_CHECK_VERSION (3, 0, 0)
+real_destroy (GtkWidget *object)
+#else
 real_destroy (GtkObject *object)
+#endif
 {
 	FMPropertiesWindow *window;
 	GList *l;
@@ -5540,7 +5544,11 @@ real_destroy (GtkObject *object)
 		window->details->update_files_timeout_id = 0;
 	}
 
+#if GTK_CHECK_VERSION (3, 0, 0)
+	GTK_WIDGET_CLASS (parent_class)->destroy (object);
+#else
 	GTK_OBJECT_CLASS (parent_class)->destroy (object);
+#endif
 }
 
 static void
@@ -5795,7 +5803,11 @@ fm_properties_window_class_init (FMPropertiesWindowClass *class)
 	GtkBindingSet *binding_set;
 
 	G_OBJECT_CLASS (class)->finalize = real_finalize;
+#if !GTK_CHECK_VERSION (3, 0, 0)
 	GTK_OBJECT_CLASS (class)->destroy = real_destroy;
+#else
+	GTK_WIDGET_CLASS (class)->destroy = real_destroy;
+#endif
 	GTK_DIALOG_CLASS (class)->response = real_response;
 
 	binding_set = gtk_binding_set_by_class (class);