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Direktori : /proc/thread-self/root/usr/lib/python3.6/site-packages/zope/event/ |
Current File : //proc/thread-self/root/usr/lib/python3.6/site-packages/zope/event/classhandler.py |
"""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): ... def __repr__(self): ... return self.__class__.__name__ >>> def handler1(event): ... print("handler1 %r" % event) >>> zope.event.classhandler.handler(MyEvent, handler1) Descriptor syntax: >>> @zope.event.classhandler.handler(MyEvent) ... def handler2(event): ... print("handler2 %r" % event) >>> class MySubEvent(MyEvent): ... pass >>> @zope.event.classhandler.handler(MySubEvent) ... def handler3(event): ... print("handler3 %r" % event) 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 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)