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binding: Add an explicit unbind()

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Higher order languages with garbage collection can have issues releasing
a binding, as they do not control the last reference being dropped on
the binding, source, or target instances.

https://bugzilla.gnome.org/show_bug.cgi?id=698018
This commit is contained in:
Emmanuele Bassi
2013-04-14 21:04:41 +01:00
parent f61daa6ed2
commit a360b314aa
4 changed files with 95 additions and 29 deletions
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32
gobject/tests/binding.c
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@@ -570,6 +570,37 @@ binding_same_object (void)
g_object_unref (source);
}
static void
binding_unbind (void)
{
BindingSource *source = g_object_new (binding_source_get_type (), NULL);
BindingTarget *target = g_object_new (binding_target_get_type (), NULL);
GBinding *binding;
binding = g_object_bind_property (source, "foo",
target, "bar",
G_BINDING_DEFAULT);
g_object_add_weak_pointer (G_OBJECT (binding), (gpointer *) &binding);
g_object_set (source, "foo", 42, NULL);
g_assert_cmpint (source->foo, ==, target->bar);
g_object_set (target, "bar", 47, NULL);
g_assert_cmpint (source->foo, !=, target->bar);
g_binding_unbind (binding);
g_assert (binding != NULL);
g_object_set (source, "foo", 0, NULL);
g_assert_cmpint (source->foo, !=, target->bar);
g_object_unref (source);
g_object_unref (target);
g_object_unref (binding);
g_assert (binding == NULL);
}
int
main (int argc, char *argv[])
{
@@ -586,6 +617,7 @@ main (int argc, char *argv[])
g_test_add_func ("/binding/sync-create", binding_sync_create);
g_test_add_func ("/binding/invert-boolean", binding_invert_boolean);
g_test_add_func ("/binding/same-object", binding_same_object);
g_test_add_func ("/binding/unbind", binding_unbind);
return g_test_run ();
}