def test_change_event_hooks(self):
# Create the test object and a function listener.
foo = Foo()
def _on_foo_baz_changed(obj, name, old, new):
pass
foo.on_trait_change(_on_foo_baz_changed, "baz")
# Set the event tracer and trigger a cascade of change events.
pre_tracer = self._collect_pre_notification_events
post_tracer = self._collect_post_notification_events
with trait_notifiers.change_event_tracers(pre_tracer, post_tracer):
foo.baz = 3
self.assertEqual(len(self.pre_change_events), 4)
self.assertEqual(len(self.post_change_events), 4)
expected_pre_events = [
(foo, "baz", 0.0, 3.0, foo._on_baz_change_notification),
(foo, "bar", 0.0, 1.0, foo._bar_changed.__func__),
(foo, "bar", 0.0, 1.0, foo._on_bar_change_notification),
(foo, "baz", 0.0, 3.0, _on_foo_baz_changed),
]
self.assertEqual(self.pre_change_events, expected_pre_events)
expected_post_events = [
(foo, "bar", 0.0, 1.0, foo._bar_changed.__func__),
(foo, "bar", 0.0, 1.0, foo._on_bar_change_notification),
(foo, "baz", 0.0, 3.0, foo._on_baz_change_notification),
(foo, "baz", 0.0, 3.0, _on_foo_baz_changed),
]
self.assertEqual(self.post_change_events, expected_post_events)
self.assertEqual(self.exceptions, [None] * 4)
# Check that the tracers are no longer active.
foo.baz = 23
self.assertEqual(len(self.pre_change_events), 4)
self.assertEqual(len(self.post_change_events), 4)
def test_change_event_hooks(self):
# Create the test object and a function listener.
foo = Foo()
def _on_foo_baz_changed(obj, name, old, new):
pass
foo.on_trait_change(_on_foo_baz_changed, "baz")
# Set the event tracer and trigger a cascade of change events.
pre_tracer = self._collect_pre_notification_events
post_tracer = self._collect_post_notification_events
with trait_notifiers.change_event_tracers(pre_tracer, post_tracer):
foo.baz = 3
self.assertEqual(len(self.pre_change_events), 4)
self.assertEqual(len(self.post_change_events), 4)
expected_pre_events = [
(foo, "baz", 0.0, 3.0, foo._on_baz_change_notification),
(foo, "bar", 0.0, 1.0, foo._bar_changed.__func__),
(foo, "bar", 0.0, 1.0, foo._on_bar_change_notification),
(foo, "baz", 0.0, 3.0, _on_foo_baz_changed),
]
self.assertEqual(self.pre_change_events, expected_pre_events)
expected_post_events = [
(foo, "bar", 0.0, 1.0, foo._bar_changed.__func__),
(foo, "bar", 0.0, 1.0, foo._on_bar_change_notification),
(foo, "baz", 0.0, 3.0, foo._on_baz_change_notification),
(foo, "baz", 0.0, 3.0, _on_foo_baz_changed),
]
self.assertEqual(self.post_change_events, expected_post_events)
self.assertEqual(self.exceptions, [None] * 4)
# Check that the tracers are no longer active.
foo.baz = 23
self.assertEqual(len(self.pre_change_events), 4)
self.assertEqual(len(self.post_change_events), 4)
def test_change_event_hooks_after_exception(self):
# Create the test object and a function listener.
foo = Foo()
def _on_foo_fuz_changed(obj, name, old, new):
raise FuzException("function")
foo.on_trait_change(_on_foo_fuz_changed, "fuz")
# Set the event tracer and trigger a cascade of change events.
pre_tracer = self._collect_pre_notification_events
post_tracer = self._collect_post_notification_events
with trait_notifiers.change_event_tracers(pre_tracer, post_tracer):
foo.fuz = 3
self.assertEqual(len(self.pre_change_events), 4)
self.assertEqual(len(self.post_change_events), 4)
expected_pre_events = [
(foo, "fuz", 0.0, 3.0, foo._on_fuz_change_notification),
(foo, "bar", 0.0, 1.0, foo._bar_changed.__func__),
(foo, "bar", 0.0, 1.0, foo._on_bar_change_notification),
(foo, "fuz", 0.0, 3.0, _on_foo_fuz_changed),
]
self.assertEqual(self.pre_change_events, expected_pre_events)
expected_post_events = [
(foo, "bar", 0.0, 1.0, foo._bar_changed.__func__),
(foo, "bar", 0.0, 1.0, foo._on_bar_change_notification),
(foo, "fuz", 0.0, 3.0, foo._on_fuz_change_notification),
(foo, "fuz", 0.0, 3.0, _on_foo_fuz_changed),
]
self.assertEqual(self.post_change_events, expected_post_events)
self.assertEqual(self.exceptions[:2], [None, None])
self.assertIsInstance(self.exceptions[2], FuzException)
self.assertEqual(self.exceptions[2].args, ("method", ))
self.assertIsInstance(self.exceptions[3], FuzException)
self.assertEqual(self.exceptions[3].args, ("function", ))
def test_change_event_hooks_after_exception(self):
# Create the test object and a function listener.
foo = Foo()
def _on_foo_fuz_changed(obj, name, old, new):
raise FuzException("function")
foo.on_trait_change(_on_foo_fuz_changed, "fuz")
# Set the event tracer and trigger a cascade of change events.
pre_tracer = self._collect_pre_notification_events
post_tracer = self._collect_post_notification_events
with trait_notifiers.change_event_tracers(pre_tracer, post_tracer):
foo.fuz = 3
self.assertEqual(len(self.pre_change_events), 4)
self.assertEqual(len(self.post_change_events), 4)
expected_pre_events = [
(foo, "fuz", 0.0, 3.0, foo._on_fuz_change_notification),
(foo, "bar", 0.0, 1.0, foo._bar_changed.__func__),
(foo, "bar", 0.0, 1.0, foo._on_bar_change_notification),
(foo, "fuz", 0.0, 3.0, _on_foo_fuz_changed),
]
self.assertEqual(self.pre_change_events, expected_pre_events)
expected_post_events = [
(foo, "bar", 0.0, 1.0, foo._bar_changed.__func__),
(foo, "bar", 0.0, 1.0, foo._on_bar_change_notification),
(foo, "fuz", 0.0, 3.0, foo._on_fuz_change_notification),
(foo, "fuz", 0.0, 3.0, _on_foo_fuz_changed),
]
self.assertEqual(self.post_change_events, expected_post_events)
self.assertEqual(self.exceptions[:2], [None, None])
self.assertIsInstance(self.exceptions[2], FuzException)
self.assertEqual(self.exceptions[2].args, ("method",))
self.assertIsInstance(self.exceptions[3], FuzException)
self.assertEqual(self.exceptions[3].args, ("function",))