[gnome-photos] offset-controller: Use G_DECLARE_DERIVABLE_TYPE

[Debarshi Ray <debarshir src gnome org>]

commit 160c187158648d7a972c88a7c667a2c9e9598eb3
Author: Kartikeya Sharma <09kartikeya gmail com>
Date:   Sun Oct 23 23:25:45 2016 +0530

    offset-controller: Use G_DECLARE_DERIVABLE_TYPE
    
    https://bugzilla.gnome.org/show_bug.cgi?id=764423

 src/photos-offset-controller.h |   30 +-----------------------------
 1 files changed, 1 insertions(+), 29 deletions(-)
---
diff --git a/src/photos-offset-controller.h b/src/photos-offset-controller.h
index 9132f43..4598352 100644
--- a/src/photos-offset-controller.h
+++ b/src/photos-offset-controller.h
@@ -32,36 +32,10 @@
 G_BEGIN_DECLS
 
 #define PHOTOS_TYPE_OFFSET_CONTROLLER (photos_offset_controller_get_type ())
+G_DECLARE_DERIVABLE_TYPE (PhotosOffsetController, photos_offset_controller, PHOTOS, OFFSET_CONTROLLER, 
GObject);
 
-#define PHOTOS_OFFSET_CONTROLLER(obj) \
-  (G_TYPE_CHECK_INSTANCE_CAST ((obj), \
-   PHOTOS_TYPE_OFFSET_CONTROLLER, PhotosOffsetController))
-
-#define PHOTOS_OFFSET_CONTROLLER_CLASS(klass) \
-  (G_TYPE_CHECK_CLASS_CAST ((klass), \
-   PHOTOS_TYPE_OFFSET_CONTROLLER, PhotosOffsetControllerClass))
-
-#define PHOTOS_IS_OFFSET_CONTROLLER(obj) \
-  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), \
-   PHOTOS_TYPE_OFFSET_CONTROLLER))
-
-#define PHOTOS_IS_OFFSET_CONTROLLER_CLASS(klass) \
-  (G_TYPE_CHECK_CLASS_TYPE ((klass), \
-   PHOTOS_TYPE_OFFSET_CONTROLLER))
-
-#define PHOTOS_OFFSET_CONTROLLER_GET_CLASS(obj) \
-  (G_TYPE_INSTANCE_GET_CLASS ((obj), \
-   PHOTOS_TYPE_OFFSET_CONTROLLER, PhotosOffsetControllerClass))
-
-typedef struct _PhotosOffsetController        PhotosOffsetController;
-typedef struct _PhotosOffsetControllerClass   PhotosOffsetControllerClass;
 typedef struct _PhotosOffsetControllerPrivate PhotosOffsetControllerPrivate;
 
-struct _PhotosOffsetController
-{
-  GObject parent_instance;
-};
-
 struct _PhotosOffsetControllerClass
 {
   GObjectClass parent_class;
@@ -74,8 +48,6 @@ struct _PhotosOffsetControllerClass
   void (*offset_changed)     (PhotosOffsetController *self, gint offset);
 };
 
-GType                       photos_offset_controller_get_type           (void) G_GNUC_CONST;
-
 PhotosOffsetController *    photos_offset_controller_new                (void);
 
 gint                        photos_offset_controller_get_count          (PhotosOffsetController *self);