将事件驱动引擎的变量改为私有,同时添加put方法
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@ -16,6 +16,17 @@ class EventEngine:
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"""
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事件驱动引擎
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事件驱动引擎中所有的变量都设置为了私有,这是为了防止不小心
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从外部修改了这些变量的值或状态,导致bug。
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变量说明
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__queue:私有变量,事件队列
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__active:私有变量,事件引擎开关
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__thread:私有变量,事件处理线程
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__timer:私有变量,计时器
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__handlers:私有变量,事件处理函数字典
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方法说明
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__run: 私有方法,事件处理线程连续运行用
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__process: 私有方法,处理事件,调用注册在引擎中的监听函数
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@ -24,12 +35,13 @@ class EventEngine:
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stop:公共方法,停止引擎
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register:公共方法,向引擎中注册监听函数
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unregister:公共方法,向引擎中注销监听函数
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put:公共方法,向事件队列中存入新的事件
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事件监听函数必须定义为输入参数仅为一个event对象,即:
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函数
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def func(event)
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....
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...
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对象方法
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def method(self, event)
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@ -41,28 +53,28 @@ class EventEngine:
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def __init__(self):
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"""初始化事件引擎"""
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# 事件队列
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self.queue = Queue()
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self.__queue = Queue()
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# 事件引擎开关
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self.active = False
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self.__active = False
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# 事件处理线程
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self.thread = Thread(target = self.__run)
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self.__thread = Thread(target = self.__run)
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# 计时器,用于触发计时器事件
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self.timer = QTimer()
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self.timer.timeout.connect(self.__onTimer)
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self.__timer = QTimer()
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self.__timer.timeout.connect(self.__onTimer)
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# 这里的handlers是一个字典,用来保存对应的事件调用关系
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# 这里的__handlers是一个字典,用来保存对应的事件调用关系
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# 其中每个键对应的值是一个列表,列表中保存了对该事件进行监听的函数功能
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self.handlers = {}
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self.__handlers = {}
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#----------------------------------------------------------------------
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def __run(self):
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"""引擎运行"""
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while self.active == True:
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while self.__active == True:
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try:
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event = self.queue.get(block = True, timeout = 1) # 获取事件的阻塞时间设为1秒
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event = self.__queue.get(block = True, timeout = 1) # 获取事件的阻塞时间设为1秒
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self.__process(event)
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except Empty:
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pass
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@ -71,10 +83,13 @@ class EventEngine:
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def __process(self, event):
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"""处理事件"""
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# 检查是否存在对该事件进行监听的处理函数
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if event.type_ in self.handlers:
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if event.type_ in self.__handlers:
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# 若存在,则按顺序将事件传递给处理函数执行
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for handler in self.handlers[event.type_]:
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handler(event)
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[handler(event) for handler in self.__handlers[event.type_]]
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# 以上语句为Python列表解析方式的写法,对应的常规循环写法为:
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#for handler in self.__handlers[event.type_]:
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#handler(event)
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#----------------------------------------------------------------------
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def __onTimer(self):
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@ -83,41 +98,41 @@ class EventEngine:
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event = Event(type_=EVENT_TIMER)
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# 向队列中存入计时器事件
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self.queue.put(event)
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self.put(event)
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#----------------------------------------------------------------------
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def start(self):
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"""引擎启动"""
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# 将引擎设为启动
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self.active = True
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self.__active = True
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# 启动事件处理线程
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self.thread.start()
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self.__thread.start()
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# 启动计时器,计时器事件间隔默认设定为1秒
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self.timer.start(1000)
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self.__timer.start(1000)
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#----------------------------------------------------------------------
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def stop(self):
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"""停止引擎"""
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# 将引擎设为停止
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self.active = False
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self.__active = False
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# 停止计时器
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self.timer.stop()
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self.__timer.stop()
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# 等待事件处理线程退出
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self.thread.join()
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self.__thread.join()
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#----------------------------------------------------------------------
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def register(self, type_, handler):
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"""注册事件处理函数监听"""
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# 尝试获取该事件类型对应的处理函数列表,若无则创建
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try:
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handlerList = self.handlers[type_]
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handlerList = self.__handlers[type_]
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except KeyError:
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handlerList = []
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self.handlers[type_] = handlerList
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self.__handlers[type_] = handlerList
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# 若要注册的处理器不在该事件的处理器列表中,则注册该事件
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if handler not in handlerList:
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@ -140,7 +155,10 @@ class EventEngine:
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except KeyError:
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pass
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#----------------------------------------------------------------------
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def put(self, event):
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"""向事件队列中存入事件"""
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self.__queue.put(event)
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########################################################################
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@ -162,7 +180,7 @@ def test():
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from PyQt4.QtCore import QCoreApplication
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def simpletest(event):
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print str(datetime.now())
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print u'处理每秒触发的计时器事件:%s' % str(datetime.now())
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app = QCoreApplication(sys.argv)
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