python之在 PyQt5 中安装 EventFilter

我正尝试在 PyQT5 中实现一个事件，但出现此错误:

TypeError: installEventFilter(self, QObject): argument 1 has unexpected type 'MainWindow_EXEC' 

这是我的代码

import sys 
from time import sleep 
from PyQt5 import QtCore, QtWidgets 
from view_cortes2 import Ui_cortes2enter 
 
class MainWindow_EXEC(): 
def __init__(self): 
    app = QtWidgets.QApplication(sys.argv) 
    cortes2 = QtWidgets.QMainWindow() 
    self.ui = Ui_cortes2() 
    self.ui.setupUi(cortes2) 
    self.flag = 0 
    self.ui.ledit_corteA.installEventFilter(self) 
    self.ui.ledit_corteB.installEventFilter(self) 
    self.ui.buttonGroup.buttonClicked.connect(self.handleButtons) 
    cortes2.show() 
    sys.exit(app.exec_()) 
 
def eventFilter(self, source, event): 
    if (event.type() == QtCore.QEvent.FocusIn and source is self.ui.ledit_corteA): 
        print("A") 
        self.flag = 0 
    if (event.type() == QtCore.QEvent.FocusIn and source is self.ui.ledit_corteA): 
        print("B") 
        self.flag = 1 
    return super(cortes2, self).eventFilter(source, event) 
 
if __name__ == "__main__": 
    MainWindow_EXEC() 

我尝试添加的事件是当我关注 TextEdit 时它会更改标志的值。如果我改变

self.ui.ledit_corteA.installEventFilter(self) 

通过

self.ui.ledit_corteA.installEventFilter(cortes2) 

我工作，但从不改变我的旗帜的值(value)。

请帮忙。

请您参考如下方法:

installEventFilter 需要一个 QObject，而在您的情况下 MainWindow_EXEC 不是。

如果您正在使用 Qt Designer 设计，建议创建一个继承自适当小部件的新类，并使用 Qt Designer 提供的类来填充它，如下所示:

import sys 
from PyQt5 import QtCore, QtWidgets 
from view_cortes2 import Ui_cortes2 
 
class MainWindow(QtWidgets.QMainWindow, Ui_cortes2): 
    def __init__(self, parent=None): 
        super(MainWindow, self).__init__(parent) 
        self.setupUi(self) 
        self.flag = 0 
        self.ledit_corteA.installEventFilter(self) 
        self.ledit_corteB.installEventFilter(self) 
        #self.buttonGroup.buttonClicked.connect(self.handleButtons) 
 
    def eventFilter(self, source, event): 
        if event.type() == QtCore.QEvent.FocusIn and source is self.ledit_corteA: 
            print("A") 
            self.flag = 0 
        if event.type() == QtCore.QEvent.FocusIn and source is self.ledit_corteB: 
            print("B") 
            self.flag = 1 
        return super(MainWindow, self).eventFilter(source, event) 
 
if __name__ == "__main__": 
    app = QtWidgets.QApplication(sys.argv) 
    w = MainWindow() 
    w.show() 
    sys.exit(app.exec_()) 

引用资料:

• http://pyqt.sourceforge.net/Docs/PyQt5/designer.html