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align: Check that source is not contained inside the actor

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AlignConstraint won't work if the source is a child or a grandchild of
the ClutterActorMeta:actor to which it has been attached to: the
allocation flows from the parent to its children, not the other way
around; in order to avoid weirdness, we better document and check
that when we set the actor and when we set the source.
This commit is contained in:
Emmanuele Bassi 2011-09-02 13:56:25 +01:00
parent 83060b30d1
commit e6dbdb444d
1 changed files with 37 additions and 2 deletions
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39
clutter/clutter-align-constraint.c
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@ -40,6 +40,8 @@
#include "clutter-align-constraint.h" #include "clutter-align-constraint.h"
#include "clutter-actor-meta-private.h"
#include "clutter-actor-private.h"
#include "clutter-constraint.h" #include "clutter-constraint.h"
#include "clutter-debug.h" #include "clutter-debug.h"
#include "clutter-enum-types.h" #include "clutter-enum-types.h"
@ -107,6 +109,19 @@ clutter_align_constraint_set_actor (ClutterActorMeta *meta,
ClutterAlignConstraint *align = CLUTTER_ALIGN_CONSTRAINT (meta); ClutterAlignConstraint *align = CLUTTER_ALIGN_CONSTRAINT (meta);
ClutterActorMetaClass *parent; ClutterActorMetaClass *parent;
if (new_actor != NULL &&
align->source != NULL &&
clutter_actor_contains (new_actor, align->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 (align->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 */ /* store the pointer to the actor, for later use */
align->actor = new_actor; align->actor = new_actor;
@ -243,7 +258,10 @@ clutter_align_constraint_class_init (ClutterAlignConstraintClass *klass)
/** /**
* ClutterAlignConstraint:source: * ClutterAlignConstraint:source:
* *
* The #ClutterActor used as the source for the alignment * The #ClutterActor used as the source for the alignment.
*
* The #ClutterActor must not be a child or a grandchild of the actor
* using the constraint.
* *
* Since: 1.4 * Since: 1.4
*/ */
@ -346,7 +364,8 @@ void
clutter_align_constraint_set_source (ClutterAlignConstraint *align, clutter_align_constraint_set_source (ClutterAlignConstraint *align,
ClutterActor *source) ClutterActor *source)
{ {
ClutterActor *old_source; ClutterActor *old_source, *actor;
ClutterActorMeta *meta;
g_return_if_fail (CLUTTER_IS_ALIGN_CONSTRAINT (align)); g_return_if_fail (CLUTTER_IS_ALIGN_CONSTRAINT (align));
g_return_if_fail (source == NULL || CLUTTER_IS_ACTOR (source)); g_return_if_fail (source == NULL || CLUTTER_IS_ACTOR (source));
@ -354,6 +373,22 @@ clutter_align_constraint_set_source (ClutterAlignConstraint *align,
if (align->source == source) if (align->source == source)
return; return;
meta = CLUTTER_ACTOR_META (align);
actor = clutter_actor_meta_get_actor (meta);
if (actor != NULL && source != 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 = align->source; old_source = align->source;
if (old_source != NULL) if (old_source != NULL)
{ {