102 lines
3.2 KiB
Python
102 lines
3.2 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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'''
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@resource:http://blog.csdn.net/zzwdkxx/article/details/39338429
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@description: 自定义QEvent事件,上面网址为C++版本原理解释,此篇为python改编
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@Created on 2018年3月22日
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@email: 625781186@qq.com
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'''
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from PyQt5 import QtGui, QtWidgets, QtCore
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from PyQt5.QtCore import *
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from PyQt5.QtGui import *
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from PyQt5.QtWidgets import *
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MyEventType = QEvent.registerEventType(QEvent.User+100)
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#//长官
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class MyEvent (QEvent):
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def __init__(self, *args, **kwargs):
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super(MyEvent, self).__init__(*args, **kwargs)
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print(MyEventType)
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def QEvent(self,MyEventType):
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pass
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#//信使
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class MySender(QCoreApplication):
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def __init__(self, *args, **kwargs):
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super(MySender, self).__init__(*args, **kwargs)
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def notify(self, receiver, event):
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if(event.type() == MyEventType):
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print("MyEventType is coming!")
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# //return true;
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# /*这里不能return true,因为重写notify就是在事件被向下传递之前截住它，
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# 随便搞它，搞完了还得给QCoreApplication::notify向下传递，除非在mySender.notify
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# 实现了事件向下传递的那一套。直接返回的话myArmy就收不到这个事件，因为执行完这个
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# mySender.notify的return true后，事件传递被人为的在半截终止了
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# （见Qt事件处理的五个层次http:#//blog.csdn.net/michealtx/article/details/6865891 ）
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# ，下面的myArmy的安装的过滤器和它自己的event都不会收到这个事件，更甭提最后干活
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# 的myEventHandler了。所以在主函数中执行完mySender.sendEvent把myEvent
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# 交给mySender.notify这个败家子儿后，就执行mySender.exec进入其它事件的循环了。这就是
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# 问题http:#//topic.csdn.net/u/20111012/19/78036d16-c163-40f9-a05c-3b7d6f4e9043.html
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# 出现的原因。感谢1+1=2大牛！非常感谢！
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# */
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return QCoreApplication.notify(self,receiver, event)
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#//军队
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class MyArmy (QWidget):
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def MyEventHandler(self,event):
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print("The event is being handled!")
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event.accept()
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def event(self, event):
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if(event.type() == MyEventType):
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print("event() is dispathing MyEvent")
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self.MyEventHandler(event) # //调用事件处理函数
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if(event.isAccepted()):
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print("The event has been handled!")
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return True
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return QObject. event(self,event)
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#//监控者
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class MyWatcher (QObject):
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def eventFilter(self,watched, event):
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if(event.type() == MyEventType):
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print("I don't wanna filter MyEventType")
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return False
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return QObject.eventFilter(self,watched, event)
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if __name__ == "__main__":
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import sys
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#//QCoreApplication a(argc, argv);
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app = QtWidgets.QApplication(sys.argv)
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mySender = MySender(sys.argv)
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myArmy=MyArmy ()
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myWatcher=MyWatcher ()
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myArmy.installEventFilter(myWatcher) # //安装事件过滤器
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myEvent=MyEvent (MyEventType)
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mySender.sendEvent( myArmy, myEvent)
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mySender.exec()
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