Python EventDispatcher.has_listeners Examples

Example #1

File: test_basic.py Project: python-whistle/whistle

def test_remove_listener():
    dispatcher = EventDispatcher()

    for event_id in (
            STRING_EVENT_ID,
            OBJECT_EVENT_ID,
            NUMERIC_EVENT_ID,
    ):
        listener = mock.MagicMock()
        assert not dispatcher.has_listeners(event_id)
        dispatcher.add_listener(event_id, listener)
        assert dispatcher.has_listeners(event_id)

        assert listener.call_count == 0

        e = dispatcher.dispatch(event_id)

        assert listener.call_count == 1
        assert not e.propagation_stopped

        assert dispatcher.has_listeners(event_id)
        dispatcher.remove_listener(event_id, listener)
        assert not dispatcher.has_listeners(event_id)

        e = dispatcher.dispatch(event_id)

        assert listener.call_count == 1
        assert not e.propagation_stopped

Example #2

File: test_basic.py Project: python-whistle/whistle

def test_dispatcher(event_id):
    dispatcher = EventDispatcher()

    listener = mock.MagicMock()
    assert not dispatcher.has_listeners(event_id)
    dispatcher.add_listener(event_id, listener)
    assert dispatcher.has_listeners(event_id)

    assert listener.call_count == 0

    e = dispatcher.dispatch(event_id)

    assert listener.call_count == 1
    assert not e.propagation_stopped

    e = dispatcher.dispatch(event_id)

    assert listener.call_count == 2
    assert not e.propagation_stopped

Example #3

File: test_basic.py Project: python-whistle/whistle

def test_no_listener():
    dispatcher = EventDispatcher()
    for event_id in (
            STRING_EVENT_ID,
            OBJECT_EVENT_ID,
            NUMERIC_EVENT_ID,
    ):
        assert not dispatcher.has_listeners(event_id)

        e = dispatcher.dispatch(event_id)
        assert not e.propagation_stopped