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"""Class-based event handlers
A light-weight event-handler framework based on event classes.
Handlers are registered for event classes:
>>> import zope.event.classhandler
>>> class MyEvent(object):
... pass
>>> def handler1(event):
... print("handler1 %r" % event.__class__.__name__)
>>> zope.event.classhandler.handler(MyEvent, handler1)
Descriptor syntax:
>>> @zope.event.classhandler.handler(MyEvent)
... def handler2(event):
... print("handler2 %r" % event.__class__.__name__)
>>> class MySubEvent(MyEvent):
... pass
>>> @zope.event.classhandler.handler(MySubEvent)
... def handler3(event):
... print("handler3 %r" % event.__class__.__name__)
Subscribers are called in class method-resolution order, so only
new-style event classes are supported, and then by order of registry.
>>> import zope.event
>>> zope.event.notify(MySubEvent())
handler3 'MySubEvent'
handler1 'MySubEvent'
handler2 'MySubEvent'
"""
import zope.event
__all__ = [
'handler',
]
registry = {}
def handler(event_class, handler_=None, _decorator=False):
""" Define an event handler for a (new-style) class.
This can be called with a class and a handler, or with just a
class and the result used as a handler decorator.
"""
if handler_ is None:
return lambda func: handler(event_class, func, True)
if not registry:
zope.event.subscribers.append(dispatch)
if event_class not in registry:
registry[event_class] = [handler_]
else:
registry[event_class].append(handler_)
if _decorator:
return handler
def dispatch(event):
for event_class in event.__class__.__mro__:
for handler in registry.get(event_class, ()):
handler(event)