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78 lines
2.1 KiB
78 lines
2.1 KiB
12 years ago
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msg_list = {}
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def listen(EventClass):
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def wrap(f):
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if isinstance(EventClass, type) \
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and issubclass(EventClass, Event) \
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and EventClass != Event:
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if not EventClass.__name__ in msg_list:
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msg_list[EventClass.__name__] = []
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msg_list[EventClass.__name__].append(f)
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# next step allow us to call the function itself without Event raised
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def wrapped_f(*args):
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f(*args)
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return wrapped_f
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else:
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raise IOError('{} is not an Event subclass'.format(EventClass))
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return wrap
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class Event(object):
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def __init__(self, string):
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"""This is an example of simple event that can be raised
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Inherit from this class and redefine whatever you need,
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except the send funtion
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"""
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self.string = string
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def send(self):
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""" This function send the instance of the class, i.e. the event to be sent,
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to all function that listen to it
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"""
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if self.__class__.__name__ in msg_list:
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for f in msg_list[self.__class__.__name__]:
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f(self)
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if __name__ == "__main__":
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class TestEvent(Event):
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def print_one(self):
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print 'one'
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@listen(TestEvent)
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def Display(TestEventInstance):
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print TestEventInstance.string
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@listen(TestEvent)
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def Helloword(TestEventInstance):
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print 'Helloword'
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@listen(TestEvent)
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def PrintIt(TestEventInstance):
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TestEventInstance.print_one()
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class AddEvent(Event):
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def __init__(self):
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pass
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def add(self, a, b):
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return a + b
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@listen(AddEvent)
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def DoIt(AddEventInstance):
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print AddEventInstance.add(17, 25)
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# using the callback system
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myevent = TestEvent('abcdefghijklmnopqrstuvwxyz')
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myevent.send() # this one call three function
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addevent = AddEvent()
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addevent.send()
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# but also work without the event raising system!
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Display(myevent)
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Helloword(myevent)
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PrintIt(myevent)
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DoIt(addevent)
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