def test_remove_callback(self):
listener_collection = collections.Listener()
cb = lambda x: x
cb2 = lambda y: y
listener_collection.add(cb)
assert len(listener_collection) == 1
listener_collection.add(cb2)
listener_collection.remove(cb)
assert len(listener_collection) == 1
def test_sort_priority(self):
listener_collection = collections.Listener()
cb1 = lambda x: x
cb2 = lambda y: y
cb3 = lambda z: z
listener_collection.add(cb1, priority=10)
listener_collection.add(cb2, priority=30)
listener_collection.add(cb3, priority=20)
listener_collection.sort_priority()
assert listener_collection[0][0] == cb2
assert listener_collection[2][0] == cb1
assert listener_collection[1][0] == cb3
def remove(self, event, callback=None):
"""Remove an event listener from the dispatcher.
Removes an event listener from the relevant Listener.
If no callback is specified, all event listeners for that event are
removed.
Args:
string event: The name of the event
callable callback: A callable function to be triggered
Returns:
Listener: A list of listeners attached to the event
"""
event = str(event)
if event not in self or not callback:
self.events[event] = collections.Listener()
if callback:
self.events[event].remove(callback)
return self.events[event]
def add(self, event, callback, priority=1, only_once=False):
"""Add an event listener to the dispatcher.
Adds an event listener to the relevant event listener collection. If
a listener is set to once_only, it will be removed when the event
is triggered on the EventDispatcher.
Args:
string event: The name of the event
callable callback: A callable function to be triggered
int priority: The priority of the listener (higher == more important)
boolean once_only: When triggered, the listener will be removed
Returns:
ListCollection: A list of listeners attached to the event
"""
event = str(event)
if event not in self.events:
self.events[event] = collections.Listener()
self.events[event].add(callback, int(priority), bool(only_once))
return self.events[event]
def test_create_listener(self):
assert repr(collections.Listener()
) == '<watson.events.collections.Listener callbacks:0>'
def test_collection_has_callback(self):
listener_collection = collections.Listener()
cb = lambda x: x
listener_collection.add(cb)
assert cb in listener_collection
def test_add_invalid_callback(self):
listener_collection = collections.Listener()
listener_collection.add('test')
def test_add_callback(self):
listener_collection = collections.Listener()
listener_collection.add(lambda x: x, priority=1)
assert repr(listener_collection
) == '<watson.events.collections.Listener callbacks:1>'