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Name	Size	Permission	Action
api.rst.txt	238 B	-rw-r--r--
api.txt	238 B	-rw-r--r--
classhandler.rst.txt	1.07 KB	-rw-r--r--
classhandler.txt	1.07 KB	-rw-r--r--
hacking.rst.txt	8.35 KB	-rw-r--r--
hacking.txt	8.35 KB	-rw-r--r--
index.rst.txt	624 B	-rw-r--r--
index.txt	624 B	-rw-r--r--
theory.rst.txt	493 B	-rw-r--r--
theory.txt	493 B	-rw-r--r--
usage.rst.txt	1.77 KB	-rw-r--r--
usage.txt	1.77 KB	-rw-r--r--

Code Editor : classhandler.txt

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