[clutter] bind: Check that the source is not contained inside the actor

[Emmanuele Bassi <ebassi src gnome org>]

commit 66607dec4de1676b970053defe33db9634ba6923
Author: Emmanuele Bassi <ebassi linux intel com>
Date:   Fri Sep 2 13:58:34 2011 +0100

    bind: Check that the source is not contained inside the actor
    
    Like commit d0439cfb586ca14282c89035119a4acbc0295df7 for
    AlignConstraint, let's check that the BindConstraint source is not
    a child or a grandchild of the actor attached to the Constraint.

 clutter/clutter-bind-constraint.c |   39 +++++++++++++++++++++++++++++++++++-
 1 files changed, 37 insertions(+), 2 deletions(-)
---
diff --git a/clutter/clutter-bind-constraint.c b/clutter/clutter-bind-constraint.c
index 472562e..a234721 100644
--- a/clutter/clutter-bind-constraint.c
+++ b/clutter/clutter-bind-constraint.c
@@ -88,6 +88,8 @@
 
 #include "clutter-bind-constraint.h"
 
+#include "clutter-actor-meta-private.h"
+#include "clutter-actor-private.h"
 #include "clutter-constraint.h"
 #include "clutter-debug.h"
 #include "clutter-enum-types.h"
@@ -208,6 +210,19 @@ clutter_bind_constraint_set_actor (ClutterActorMeta *meta,
   ClutterBindConstraint *bind = CLUTTER_BIND_CONSTRAINT (meta);
   ClutterActorMetaClass *parent;
 
+  if (new_actor != NULL &&
+      bind->source != NULL &&
+      clutter_actor_contains (new_actor, bind->source))
+    {
+      g_warning (G_STRLOC ": The source actor '%s' is contained "
+                 "by the actor '%s' associated to the constraint "
+                 "'%s'",
+                 _clutter_actor_get_debug_name (bind->source),
+                 _clutter_actor_get_debug_name (new_actor),
+                 _clutter_actor_meta_get_debug_name (meta));
+      return;
+    }
+
   /* store the pointer to the actor, for later use */
   bind->actor = new_actor;
 
@@ -307,7 +322,10 @@ clutter_bind_constraint_class_init (ClutterBindConstraintClass *klass)
   /**
    * ClutterBindConstraint:source:
    *
-   * The #ClutterActor used as the source for the binding
+   * The #ClutterActor used as the source for the binding.
+   *
+   * The #ClutterActor must not be contained inside the actor associated
+   * to the constraint.
    *
    * Since: 1.4
    */
@@ -403,7 +421,8 @@ void
 clutter_bind_constraint_set_source (ClutterBindConstraint *constraint,
                                     ClutterActor          *source)
 {
-  ClutterActor *old_source;
+  ClutterActor *old_source, *actor;
+  ClutterActorMeta *meta;
 
   g_return_if_fail (CLUTTER_IS_BIND_CONSTRAINT (constraint));
   g_return_if_fail (source == NULL || CLUTTER_IS_ACTOR (source));
@@ -411,6 +430,22 @@ clutter_bind_constraint_set_source (ClutterBindConstraint *constraint,
   if (constraint->source == source)
     return;
 
+  meta = CLUTTER_ACTOR_META (constraint);
+  actor = clutter_actor_meta_get_actor (meta);
+  if (source != NULL && actor != NULL)
+    {
+      if (clutter_actor_contains (actor, source))
+        {
+          g_warning (G_STRLOC ": The source actor '%s' is contained "
+                     "by the actor '%s' associated to the constraint "
+                     "'%s'",
+                     _clutter_actor_get_debug_name (source),
+                     _clutter_actor_get_debug_name (actor),
+                     _clutter_actor_meta_get_debug_name (meta));
+          return;
+        }
+    }
+
   old_source = constraint->source;
   if (old_source != NULL)
     {