__author__ = ‘Administrator‘ #/usr/env/bin python ‘‘‘ this is document ‘‘‘ class Event(object): ‘‘‘ 事件初始化的一个方式 ‘‘‘ def __init__(self,event_type,data=None): self._type = event_type self._data = data @property def type(self): return self._type @property def data(self): return self._data class EventDispatcher(object): """ event分发类 监听和分发event事件 """ def __init__(self): #初始化事件 self._events = dict() def __del__(self): self._events = None def has_listener(self,event_type,listener): if event_type in self._events.keys(): return listener in self._events[event_type] else: return False def dispatch_event(self,event): """ Dispatch an instance of Event class """ # 分发event到所有关联的listener if event.type in self._events.keys(): listeners = self._events[event.type] for listener in listeners: listener(event) def add_event_listener(self,event_type,listener): #给某种事件类型添加listner if not self.has_listener(event_type,listener): listeners = self._events.get(event_type,[]) listeners.append(listener) self._events[event_type] = listeners def remove_event_listener(self,event_type,listener): if self.has_listener(event_type,listener): listeners = self._events[event_type] if len(listeners) == 1: del self._events[event_type] else: listeners.remove(listener) self._events[event_type] = listeners class MyEvent(Event): ASK = "askMyEvent" RESPOND = "respondMyEvent" class WhoAsk(object): def __init__(self,event_dispatcher): self.event_dispatcher = event_dispatcher self.event_dispatcher.add_event_listener( MyEvent.RESPOND,self.on_answer_event ) def ask(self): print("who are listener to me?") self.event_dispatcher.dispatch_event(MyEvent(MyEvent.ASK,self)) def on_answer_event(self,event): print("receive event %s",event.data) class WhoRespond(object): def __init__(self,event_dispatcher): self.event_dispatcher = event_dispatcher self.event_dispatcher.add_event_listener(MyEvent.ASK,self.on_ask_event) def on_ask_event(self,event): self.event_dispatcher.dispatch_event(MyEvent(MyEvent.RESPOND,self)) dispatcher = EventDispatcher() who_ask = WhoAsk( dispatcher ) who_responde1 = WhoRespond( dispatcher ) who_responde2 = WhoRespond( dispatcher ) # WhoAsk ask who_ask.ask()
使用事件驱动的方式写代码也不是一天两天了,今天突然发现这玩意居然有个理论在支撑这个。瞬间感到自己学的都是一点点皮毛而己。
python的事件模型的优势是,可以直接将某个方法放入事件中,这个好象要比java先进一点。
时间: 2024-10-10 09:33:31