class CallbackBase:
def __init__(self):
self.__callbackMap = {}
for k in (getattr(self, x) for x in dir(self)):
if hasattr(k, "bind_to_event"):
self.__callbackMap.setdefault(k.bind_to_event, []).append(k)
elif hasattr(k, "bind_to_event_list"):
for j in k.bind_to_event_list:
self.__callbackMap.setdefault(j, []).append(k)
## staticmethod is only used to create a namespace
@staticmethod
def callback(event):
def f(g, ev = event):
g.bind_to_event = ev
return g
return f
@staticmethod
def callbacklist(eventlist):
def f(g, evl = eventlist):
g.bind_to_event_list = evl
return g
return f
def dispatch(self, event):
l = self.__callbackMap[event]
f = lambda *args, **kargs: \
map(lambda x: x(*args, **kargs), l)
return f
## Sample
class MyClass(CallbackBase):
EVENT1 = 1
EVENT2 = 2
@CallbackBase.callback(EVENT1)
def handler1(self, param = None):
print "handler1 with param: %s" % str(param)
return None
@CallbackBase.callbacklist([EVENT1, EVENT2])
def handler2(self, param = None):
print "handler2 with param: %s" % str(param)
return None
def run(self, event, param = None):
self.dispatch(event)(param)
if __name__ == "__main__":
a = MyClass()
a.run(MyClass.EVENT1, 'mandarina')
a.run(MyClass.EVENT2, 'naranja')
