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============================
Class-based event handlers
============================
A light-weight event-handler framework based on event classes is
provided by the ``zope.event.classhandler`` module.
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
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