[gnome-photos] tool: Use G_DECLARE_DERIVABLE_TYPE

[Debarshi Ray <debarshir src gnome org>]

commit 2b55aa683375760e132d0712e15645b9540edfd0
Author: Kartikeya Sharma <09kartikeya gmail com>
Date:   Wed Oct 26 02:19:23 2016 +0530

    tool: Use G_DECLARE_DERIVABLE_TYPE
    
    https://bugzilla.gnome.org/show_bug.cgi?id=764423

 src/photos-tool.h |   31 +------------------------------
 1 files changed, 1 insertions(+), 30 deletions(-)
---
diff --git a/src/photos-tool.h b/src/photos-tool.h
index de4b3c0..b304643 100644
--- a/src/photos-tool.h
+++ b/src/photos-tool.h
@@ -31,34 +31,7 @@
 G_BEGIN_DECLS
 
 #define PHOTOS_TYPE_TOOL (photos_tool_get_type ())
-
-#define PHOTOS_TOOL(obj) \
-  (G_TYPE_CHECK_INSTANCE_CAST ((obj), \
-   PHOTOS_TYPE_TOOL, PhotosTool))
-
-#define PHOTOS_TOOL_CLASS(klass) \
-  (G_TYPE_CHECK_CLASS_CAST ((klass), \
-   PHOTOS_TYPE_TOOL, PhotosToolClass))
-
-#define PHOTOS_IS_TOOL(obj) \
-  (G_TYPE_CHECK_INSTANCE_TYPE ((obj), \
-   PHOTOS_TYPE_TOOL))
-
-#define PHOTOS_IS_TOOL_CLASS(klass) \
-  (G_TYPE_CHECK_CLASS_TYPE ((klass), \
-   PHOTOS_TYPE_TOOL))
-
-#define PHOTOS_TOOL_GET_CLASS(obj) \
-  (G_TYPE_INSTANCE_GET_CLASS ((obj), \
-   PHOTOS_TYPE_TOOL, PhotosToolClass))
-
-typedef struct _PhotosTool      PhotosTool;
-typedef struct _PhotosToolClass PhotosToolClass;
-
-struct _PhotosTool
-{
-  GObject parent_instance;
-};
+G_DECLARE_DERIVABLE_TYPE (PhotosTool, photos_tool, PHOTOS, TOOL, GObject);
 
 struct _PhotosToolClass
 {
@@ -81,8 +54,6 @@ struct _PhotosToolClass
   void          (*hide_requested)             (PhotosTool *self);
 };
 
-GType               photos_tool_get_type                (void) G_GNUC_CONST;
-
 void                photos_tool_activate                (PhotosTool *self,
                                                          PhotosBaseItem *item,
                                                          PhotosImageView *view);