core/observable.py

   1 class observable:
   2     """The Observer/Observable pattern"""
   3
   4     def __init__(self):
   5         self.callbacks = []
   6
   7     def add_observer(self, callback):
   8         self.callbacks.append(callback)
   9
  10     def del_observer(self, callback):
  11         self.callbacks.remove(callback)
  12
  13     def fire_observers(self, *args, **kwargs):
  14         # Copy in case the list is modified by an observer
  15         for cb in self.callbacks[:]:
  16             cb(*args, **kwargs)