[clutter] layout-manager: Add a private struct to hold future properties

[Bastian Winkler <bwinkler src gnome org>]

commit 734720ef0f849b1e31b01d3d376dfeb3b310ca5f
Author: Bastian Winkler <buz netbuz org>
Date:   Thu May 24 14:26:57 2012 +0200

    layout-manager: Add a private struct to hold future properties
    
    In order to allow the abstract ClutterLayoutManager class to have own
    GObject properties we'll need a private structure.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=676827

 clutter/clutter-layout-manager.c |   10 ++++++++++
 clutter/clutter-layout-manager.h |    4 ++--
 2 files changed, 12 insertions(+), 2 deletions(-)
---
diff --git a/clutter/clutter-layout-manager.c b/clutter/clutter-layout-manager.c
index 9e16e21..39da12c 100644
--- a/clutter/clutter-layout-manager.c
+++ b/clutter/clutter-layout-manager.c
@@ -345,6 +345,11 @@
                    G_OBJECT_TYPE_NAME (_obj),                           \
                    (method));                           } G_STMT_END
 
+struct _ClutterLayoutManagerPrivate
+{
+  gpointer dummy;
+};
+
 enum
 {
   LAYOUT_CHANGED,
@@ -585,6 +590,8 @@ clutter_layout_manager_class_init (ClutterLayoutManagerClass *klass)
   quark_layout_alpha =
     g_quark_from_static_string ("clutter-layout-manager-alpha");
 
+  g_type_class_add_private (klass, sizeof (ClutterLayoutManagerPrivate));
+
   klass->get_preferred_width = layout_manager_real_get_preferred_width;
   klass->get_preferred_height = layout_manager_real_get_preferred_height;
   klass->allocate = layout_manager_real_allocate;
@@ -638,6 +645,9 @@ clutter_layout_manager_class_init (ClutterLayoutManagerClass *klass)
 static void
 clutter_layout_manager_init (ClutterLayoutManager *manager)
 {
+  manager->priv =
+    G_TYPE_INSTANCE_GET_PRIVATE (manager, CLUTTER_TYPE_LAYOUT_MANAGER,
+                                 ClutterLayoutManagerPrivate);
 }
 
 /**
diff --git a/clutter/clutter-layout-manager.h b/clutter/clutter-layout-manager.h
index 74efb76..d19d563 100644
--- a/clutter/clutter-layout-manager.h
+++ b/clutter/clutter-layout-manager.h
@@ -40,6 +40,7 @@ G_BEGIN_DECLS
 #define CLUTTER_IS_LAYOUT_MANAGER_CLASS(klass)  (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_LAYOUT_MANAGER))
 #define CLUTTER_LAYOUT_MANAGER_GET_CLASS(obj)   (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_LAYOUT_MANAGER, ClutterLayoutManagerClass))
 
+typedef struct _ClutterLayoutManagerPrivate     ClutterLayoutManagerPrivate;
 typedef struct _ClutterLayoutManagerClass       ClutterLayoutManagerClass;
 
 /**
@@ -55,8 +56,7 @@ struct _ClutterLayoutManager
   /*< private >*/
   GInitiallyUnowned parent_instance;
 
-  /* padding for future expansion */
-  gpointer dummy;
+  ClutterLayoutManagerPrivate *priv;
 };
 
 /**