30 lines
921 B
Python
30 lines
921 B
Python
# event system
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from collections import defaultdict
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EVENT_CALLBACKS = defaultdict(list)
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def add_listener(event, callback, priority=5):
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if (priority, callback) not in EVENT_CALLBACKS[event]:
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EVENT_CALLBACKS[event].append((priority, callback))
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EVENT_CALLBACKS[event].sort(key = lambda x: x[0])
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def remove_listener(event, callback, priority = 5):
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if (priority, callback) in EVENT_CALLBACKS[event]:
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EVENT_CALLBACKS[event].remove((priority, callback))
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class Event:
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def __init__(self, name, data):
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self.stop_processing = False
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self.prevent_default = False
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self.name = name
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self.data = data
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def dispatch(self, *args, **kwargs):
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for item in list(EVENT_CALLBACKS[self.name]):
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item[1](self, *args, **kwargs)
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if self.stop_processing:
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break
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return not self.prevent_default
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# vim: set sw=4 expandtab:
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