更新vn.event
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@ -3,6 +3,7 @@
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# 系统模块
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from Queue import Queue, Empty
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from threading import Thread
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from time import sleep
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# 第三方模块
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from PyQt4.QtCore import QTimer
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@ -12,7 +13,7 @@ from eventType import *
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########################################################################
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class EventEngine:
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class EventEngine(object):
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"""
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事件驱动引擎
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@ -151,7 +152,132 @@ class EventEngine:
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# 如果函数列表为空,则从引擎中移除该事件类型
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if not handlerList:
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del self.handlers[type_]
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del self.__handlers[type_]
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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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class EventEngine2(object):
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"""
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计时器使用python线程的事件驱动引擎
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"""
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#----------------------------------------------------------------------
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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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# 事件引擎开关
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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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# 计时器,用于触发计时器事件
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self.__timer = Thread(target = self.__runTimer)
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self.__timerActive = False # 计时器工作状态
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self.__timerSleep = 1 # 计时器触发间隔(默认1秒)
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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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#----------------------------------------------------------------------
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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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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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self.__process(event)
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except Empty:
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pass
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#----------------------------------------------------------------------
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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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# 若存在,则按顺序将事件传递给处理函数执行
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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 __runTimer(self):
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"""运行在计时器线程中的循环函数"""
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while self.__timerActive:
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# 创建计时器事件
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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.put(event)
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# 等待
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sleep(self.__timerSleep)
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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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# 启动事件处理线程
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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.__timerActive = True
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self.__timer.start()
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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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# 停止计时器
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self.__timerActive = False
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self.__timer.join()
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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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#----------------------------------------------------------------------
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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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except KeyError:
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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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handlerList.append(handler)
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#----------------------------------------------------------------------
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def unregister(self, type_, handler):
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"""注销事件处理函数监听"""
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# 尝试获取该事件类型对应的处理函数列表,若无则忽略该次注销请求
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try:
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handlerList = self.__handlers[type_]
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# 如果该函数存在于列表中,则移除
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if handler in handlerList:
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handlerList.remove(handler)
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# 如果函数列表为空,则从引擎中移除该事件类型
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if not handlerList:
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del self.__handlers[type_]
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except KeyError:
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pass
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@ -184,7 +310,7 @@ def test():
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app = QCoreApplication(sys.argv)
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ee = EventEngine()
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ee = EventEngine2()
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ee.register(EVENT_TIMER, simpletest)
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ee.start()
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