constraint: Add a private header

And move the only private ClutterConstraint method to it.

This commit also sneaks in a change that makes sense for the debugging
of the update_allocation() method, which checks if the allocation was
effectively changed.

clutter/Makefile.am

@@ -221,6 +221,7 @@ source_h_priv = \
 	clutter-actor-private.h			\
 	clutter-backend-private.h		\
 	clutter-bezier.h			\
+	clutter-constraint-private.h		\
 	clutter-content-private.h		\
 	clutter-debug.h 			\
 	clutter-device-manager-private.h	\

clutter/clutter-actor.c

@@ -611,7 +611,7 @@
 #include "clutter-animatable.h"
 #include "clutter-color-static.h"
 #include "clutter-color.h"
-#include "clutter-constraint.h"
+#include "clutter-constraint-private.h"
 #include "clutter-container.h"
 #include "clutter-content-private.h"
 #include "clutter-debug.h"
@@ -9650,19 +9650,21 @@ clutter_actor_update_constraints (ClutterActor    *self,
 
       if (clutter_actor_meta_get_enabled (meta))
         {
-          _clutter_constraint_update_allocation (constraint,
+          gboolean changed =
+            clutter_constraint_update_allocation (constraint,
                                                   self,
                                                   allocation);
 
           CLUTTER_NOTE (LAYOUT,
                         "Allocation of '%s' after constraint '%s': "
-                        "{ %.2f, %.2f, %.2f, %.2f }",
+                        "{ %.2f, %.2f, %.2f, %.2f } (changed:%s)",
                         _clutter_actor_get_debug_name (self),
                         _clutter_actor_meta_get_debug_name (meta),
                         allocation->x1,
                         allocation->y1,
                         allocation->x2,
-                        allocation->y2);
+                        allocation->y2,
+                        changed ? "yes" : "no");
         }
     }
 }

clutter/clutter-constraint-private.h

@@ -0,0 +1,35 @@
+/*
+ * Clutter.
+ *
+ * An OpenGL based 'interactive canvas' library.
+ *
+ * Copyright (C) 2010  Intel Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __CLUTTER_CONSTRAINT_PRIVATE_H__
+#define __CLUTTER_CONSTRAINT_PRIVATE_H__
+
+#include "clutter-constraint.h"
+
+G_BEGIN_DECLS
+
+gboolean clutter_constraint_update_allocation (ClutterConstraint *constraint,
+                                               ClutterActor      *actor,
+                                               ClutterActorBox   *allocation);
+
+G_END_DECLS
+
+#endif /* __CLUTTER_CONSTRAINT_PRIVATE_H__ */

clutter/clutter-constraint.c

@@ -1,3 +1,27 @@
+/*
+ * Clutter.
+ *
+ * An OpenGL based 'interactive canvas' library.
+ *
+ * Copyright (C) 2010  Intel Corporation.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author:
+ *   Emmanuele Bassi <ebassi@linux.intel.com>
+ */
+
 /**
  * SECTION:clutter-constraint
  * @Title: ClutterConstraint
@@ -110,7 +134,7 @@
 
 #include <string.h>
 
-#include "clutter-constraint.h"
+#include "clutter-constraint-private.h"
 
 #include "clutter-actor.h"
 #include "clutter-actor-meta-private.h"
@@ -159,16 +183,32 @@ clutter_constraint_init (ClutterConstraint *self)
 {
 }
 
-void
+/*< private >
-_clutter_constraint_update_allocation (ClutterConstraint *constraint,
+ * clutter_constraint_update_allocation:
+ * @constraint: a #ClutterConstraint
+ * @actor: a #ClutterActor
+ * @allocation: (inout): the allocation to modify
+ *
+ * Asks the @constraint to update the @allocation of a #ClutterActor.
+ *
+ * Returns: %TRUE if the allocation was updated
+ */
+gboolean
+clutter_constraint_update_allocation (ClutterConstraint *constraint,
                                       ClutterActor      *actor,
                                       ClutterActorBox   *allocation)
 {
-  g_return_if_fail (CLUTTER_IS_CONSTRAINT (constraint));
+  ClutterActorBox old_alloc;
-  g_return_if_fail (CLUTTER_IS_ACTOR (actor));
+
-  g_return_if_fail (allocation != NULL);
+  g_return_val_if_fail (CLUTTER_IS_CONSTRAINT (constraint), FALSE);
+  g_return_val_if_fail (CLUTTER_IS_ACTOR (actor), FALSE);
+  g_return_val_if_fail (allocation != NULL, FALSE);
+
+  old_alloc = *allocation;
 
   CLUTTER_CONSTRAINT_GET_CLASS (constraint)->update_allocation (constraint,
                                                                 actor,
                                                                 allocation);
+
+  return clutter_actor_box_equal (allocation, &old_alloc);
 }

clutter/clutter-private.h

@@ -245,10 +245,6 @@ gboolean _clutter_boolean_continue_accumulator (GSignalInvocationHint *ihint,
 
 void _clutter_run_repaint_functions (ClutterRepaintFlags flags);
 
-void _clutter_constraint_update_allocation (ClutterConstraint *constraint,
-                                            ClutterActor      *actor,
-                                            ClutterActorBox   *allocation);
-
 GType _clutter_layout_manager_get_child_meta_type (ClutterLayoutManager *manager);
 
 void  _clutter_util_fully_transform_vertices (const CoglMatrix    *modelview,

doc/reference/clutter/Makefile.am

@@ -72,6 +72,7 @@ IGNORE_HFILES = \
 	clutter-cogl-compat.h		\
 	clutter-color-static.h		\
 	clutter-config.h		\
+	clutter-constraint-private.h	\
 	clutter-debug.h 		\
 	clutter-deprecated.h 		\
 	clutter-device-manager-private.h	\