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35 lines
820 B
Python
35 lines
820 B
Python
class Subject:
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"""Adds support for observers"""
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def __init__(self):
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"""list of current observers"""
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self._observers = list()
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def notify(self, modifier=None):
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"""run callbacks on update"""
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[o.on_update(modifier) for o in self._observers]
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def add(self, observer):
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"""adds an observer to _observers"""
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if observer not in self._observers:
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self._observers.append(observer)
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def remove(self, observer):
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"""removes an observer from _observers"""
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if observer in self._observers:
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self._observers.remove(observer)
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def get(self) -> list:
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"""returns the current _observers"""
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return self._observers
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def clear(self):
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"""clears the _observers list"""
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self._observers.clear()
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