30 lines
587 B
Python
30 lines
587 B
Python
# Based on http://stackoverflow.com/a/2022629
|
|
|
|
class Event(list):
|
|
def __call__(self, *args, **kwargs):
|
|
for f in self[:]:
|
|
if "once" in dir(f):
|
|
self.remove(f)
|
|
f(*args, **kwargs)
|
|
|
|
|
|
def __repr__(self):
|
|
return "Event(%s)" % list.__repr__(self)
|
|
|
|
|
|
def once(self, func):
|
|
func.once = True
|
|
self.append(func)
|
|
return self
|
|
|
|
|
|
if __name__ == "__main__":
|
|
def say(pre, text):
|
|
print "%s Say: %s" % (pre, text)
|
|
onChanged = Event()
|
|
onChanged.once(lambda pre: say(pre, "once"))
|
|
onChanged.append(lambda pre: say(pre, "always"))
|
|
onChanged("#1")
|
|
onChanged("#2")
|
|
onChanged("#3")
|