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constraints: Allow Align and Bind sources to be NULL

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Since constructing AlignConstraint and BindConstraint instances could be
deferred (think ClutterScript) we need to make their :source properties
setters accept NULL. This does not break the constraints because they
need to handle that condition in case they actor to which they are
applied is destroyed and somebody is holding a reference on them anyway.
This commit is contained in:
Emmanuele Bassi
2010-06-17 17:33:10 +01:00
parent a4dbcf0c32
commit a75c02a5d6
2 changed files with 31 additions and 22 deletions
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26
clutter/clutter-bind-constraint.c
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@ -257,7 +257,8 @@ clutter_bind_constraint_init (ClutterBindConstraint *self)
/**
* clutter_bind_constraint_new:
* @source: the #ClutterActor to use as the source of the binding
* @source: (allow-none): the #ClutterActor to use as the source of
* the binding, or %NULL
* @coordinate: the coordinate to bind
* @offset: the offset to apply to the binding, in pixels
*
@ -273,7 +274,7 @@ clutter_bind_constraint_new (ClutterActor *source,
ClutterBindCoordinate coordinate,
gfloat offset)
{
g_return_val_if_fail (CLUTTER_IS_ACTOR (source), NULL);
g_return_val_if_fail (source == NULL || CLUTTER_IS_ACTOR (source), NULL);
return g_object_new (CLUTTER_TYPE_BIND_CONSTRAINT,
"source", source,
@ -285,7 +286,7 @@ clutter_bind_constraint_new (ClutterActor *source,
/**
* clutter_bind_constraint_set_source:
* @constraint: a #ClutterBindConstraint
* @source: a #ClutterActor
* @source: (allow-none): a #ClutterActor, or %NULL to unset the source
*
* Sets the source #ClutterActor for the constraint
*
@ -298,7 +299,7 @@ clutter_bind_constraint_set_source (ClutterBindConstraint *constraint,
ClutterActor *old_source;
g_return_if_fail (CLUTTER_IS_BIND_CONSTRAINT (constraint));
g_return_if_fail (CLUTTER_IS_ACTOR (source));
g_return_if_fail (source == NULL || CLUTTER_IS_ACTOR (source));
old_source = constraint->source;
if (old_source != NULL)
@ -312,14 +313,17 @@ clutter_bind_constraint_set_source (ClutterBindConstraint *constraint,
}
constraint->source = source;
g_signal_connect (constraint->source, "notify",
G_CALLBACK (source_position_changed),
constraint);
g_signal_connect (constraint->source, "destroy",
G_CALLBACK (source_destroyed),
constraint);
if (constraint->source != NULL)
{
g_signal_connect (constraint->source, "notify",
G_CALLBACK (source_position_changed),
constraint);
g_signal_connect (constraint->source, "destroy",
G_CALLBACK (source_destroyed),
constraint);
update_actor_position (constraint);
update_actor_position (constraint);
}
g_object_notify (G_OBJECT (constraint), "source");
}