63 lines
1.5 KiB
Python
63 lines
1.5 KiB
Python
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from eventpy.eventdispatcher import EventDispatcher
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from appPublic.dictObject import DictObject
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def bind(self, eventname, handler):
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self.appendListener(eventname, handler)
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def unbind(self, eventname, handler):
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self.removeListener(eventname, handler);
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EventDispatcher.bind = bind
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EventDispatcher.unbind = unbind
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class EventProperty:
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def __init__(self, event_name, initial_value=None):
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self._value = initial_value
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self.event_name = event_name
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def __get__(self, instance, owner):
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return self._value
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def __set__(self, instance, value):
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if self._value != value:
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self._value = value
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d = DictObject()
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d.target = instance
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d.data = value
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d.event = self.event_name
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instance.dispatch(self.event_name, d)
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if __name__ == '__main__':
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class SomeClass(EventDispatcher):
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state = EventProperty('onstate', 0)
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age = EventProperty('onage', 20)
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def __init__(self):
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super().__init__()
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def observer1(data):
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print(f"Observer 1 received: {data}")
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def observer2(data):
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print(f"Observer 2 received: {data}")
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def observer3(data):
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print(f"Observer 3 received: {data}")
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# 创建实例
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si = SomeClass()
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# 添加监听
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si.bind('onstate', observer1)
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si.bind('onstate', observer2)
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si.bind('onage', observer3)
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# 改变状态
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si.state = 10 # 输出: Observer 1 received: 10, Observer 2 received: 10
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# 再次改变状态
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# si.unbind('onstate', observer1) unbind has error
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si.state = 20 # 输出: Observer 2 received: 20
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# change age's value
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si.age = 30
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