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| 1 | +#!/usr/bin/env python |
| 2 | +# -*- coding: utf-8 -*- |
| 3 | + |
| 4 | +''' |
| 5 | +@resource:http://blog.csdn.net/zzwdkxx/article/details/39338429 |
| 6 | +@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 |
| 7 | +@Created on 2018年3月22日 |
| 8 | +@email: 625781186@qq.com |
| 9 | +''' |
| 10 | + |
| 11 | +from PyQt5 import QtGui, QtWidgets, QtCore |
| 12 | +from PyQt5.QtCore import * |
| 13 | +from PyQt5.QtGui import * |
| 14 | +from PyQt5.QtWidgets import * |
| 15 | + |
| 16 | + |
| 17 | +MyEventType = QEvent.registerEventType(QEvent.User+100) |
| 18 | + |
| 19 | +#//长官 |
| 20 | + |
| 21 | +class MyEvent (QEvent): |
| 22 | + def __init__(self, *args, **kwargs): |
| 23 | + super(MyEvent, self).__init__(*args, **kwargs) |
| 24 | + print(MyEventType) |
| 25 | + def QEvent(self,MyEventType): |
| 26 | + pass |
| 27 | + |
| 28 | +#//信使 |
| 29 | + |
| 30 | +class MySender(QCoreApplication): |
| 31 | + |
| 32 | + def __init__(self, *args, **kwargs): |
| 33 | + super(MySender, self).__init__(*args, **kwargs) |
| 34 | + def notify(self, receiver, event): |
| 35 | + |
| 36 | + if(event.type() == MyEventType): |
| 37 | + |
| 38 | + print("MyEventType is coming!") |
| 39 | + # //return true; |
| 40 | + # /*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, |
| 41 | + # 随便搞它,搞完了还得给QCoreApplication::notify向下传递,除非在mySender.notify |
| 42 | + # 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 |
| 43 | + # mySender.notify的return true后,事件传递被人为的在半截终止了 |
| 44 | + # (见Qt事件处理的五个层次http:#//blog.csdn.net/michealtx/article/details/6865891 ) |
| 45 | + # ,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 |
| 46 | + # 的myEventHandler了。所以在主函数中执行完mySender.sendEvent把myEvent |
| 47 | + # 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 |
| 48 | + # 问题http:#//topic.csdn.net/u/20111012/19/78036d16-c163-40f9-a05c-3b7d6f4e9043.html |
| 49 | + # 出现的原因。感谢1+1=2大牛!非常感谢! |
| 50 | + # */ |
| 51 | + |
| 52 | + return QCoreApplication.notify(self,receiver, event) |
| 53 | + |
| 54 | +#//军队 |
| 55 | + |
| 56 | +class MyArmy (QWidget): |
| 57 | + |
| 58 | + def MyEventHandler(self,event): |
| 59 | + |
| 60 | + print("The event is being handled!") |
| 61 | + event.accept() |
| 62 | + |
| 63 | + def event(self, event): |
| 64 | + |
| 65 | + if(event.type() == MyEventType): |
| 66 | + |
| 67 | + print("event() is dispathing MyEvent") |
| 68 | + self.MyEventHandler(event) # //调用事件处理函数 |
| 69 | + if(event.isAccepted()): |
| 70 | + |
| 71 | + print("The event has been handled!") |
| 72 | + return True |
| 73 | + return QObject. event(self,event) |
| 74 | + |
| 75 | + |
| 76 | +#//监控者 |
| 77 | + |
| 78 | +class MyWatcher (QObject): |
| 79 | + |
| 80 | + def eventFilter(self,watched, event): |
| 81 | + |
| 82 | + if(event.type() == MyEventType): |
| 83 | + |
| 84 | + print("I don't wanna filter MyEventType") |
| 85 | + return False |
| 86 | + |
| 87 | + return QObject.eventFilter(self,watched, event) |
| 88 | + |
| 89 | + |
| 90 | +if __name__ == "__main__": |
| 91 | + import sys |
| 92 | + #//QCoreApplication a(argc, argv); |
| 93 | + app = QtWidgets.QApplication(sys.argv) |
| 94 | + mySender = MySender(sys.argv) |
| 95 | + |
| 96 | + myArmy=MyArmy () |
| 97 | + myWatcher=MyWatcher () |
| 98 | + myArmy.installEventFilter(myWatcher) # //安装事件过滤器 |
| 99 | + |
| 100 | + myEvent=MyEvent (MyEventType) |
| 101 | + mySender.sendEvent( myArmy, myEvent) |
| 102 | + mySender.exec() |
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