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clutter/actor: Don't emit the parent-set signal on destruction

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Clutter actors unset their parent on dispose, after emitting the ::destroy
signal, however this could cause ::parent-set signal emission. Since we
assume that after the destruction has been completed the actor isn't valid
anymore, and that during the destroy phase we do all the signal / source
disconnections, this might create unwanted behaviors, as in the signal
callbacks we always assume that the actor isn't in disposed yet.

To avoid this, don't emit ::parent-set signal if the actor is being
destroyed.

Update the actor-destroy test to verify this behavior.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/769
This commit is contained in:
Marco Trevisan (Treviño) 2019-09-10 03:19:58 +02:00 committed by Marco Trevisan
parent 4b88c1832a
commit f376a318ba
2 changed files with 18 additions and 1 deletions
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3
clutter/clutter/clutter-actor.c
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@ -4436,7 +4436,8 @@ clutter_actor_remove_child_internal (ClutterActor *self,
}
/* clutter_actor_reparent() will emit ::parent-set for us */
if (emit_parent_set && !CLUTTER_ACTOR_IN_REPARENT (child))
if (emit_parent_set && !CLUTTER_ACTOR_IN_REPARENT (child) &&
!CLUTTER_ACTOR_IN_DESTRUCTION (child))
{
child->priv->needs_compute_resource_scale = TRUE;
g_signal_emit (child, actor_signals[PARENT_SET], 0, self);

16
src/tests/clutter/conform/actor-destroy.c
View file

@ -161,15 +161,28 @@ on_destroy (ClutterActor *actor,
{
gboolean *destroy_called = data;
g_assert_true (CLUTTER_IS_ACTOR (clutter_actor_get_parent (actor)));
*destroy_called = TRUE;
}
static void
on_parent_set (ClutterActor *actor,
ClutterActor *old_parent,
gpointer data)
{
gboolean *parent_set_called = data;
*parent_set_called = TRUE;
}
static void
actor_destruction (void)
{
ClutterActor *test = g_object_new (TEST_TYPE_DESTROY, NULL);
ClutterActor *child = clutter_rectangle_new ();
gboolean destroy_called = FALSE;
gboolean parent_set_called = FALSE;
g_object_ref_sink (test);
@ -181,6 +194,8 @@ actor_destruction (void)
clutter_actor_set_name (child, "Child");
clutter_container_add_actor (CLUTTER_CONTAINER (test), child);
g_signal_connect (child, "parent-set", G_CALLBACK (on_parent_set),
&parent_set_called);
g_signal_connect (child, "destroy", G_CALLBACK (on_destroy), &destroy_called);
if (g_test_verbose ())
@ -188,6 +203,7 @@ actor_destruction (void)
clutter_actor_destroy (test);
g_assert (destroy_called);
g_assert_false (parent_set_called);
g_assert_null (child);
g_assert_null (test);
}