在 PyQt5 中安装 EventFilter

Question

我正在尝试在 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)

来自

self.ui.ledit_corteA.installEventFilter(cortes2)

我工作，但从不改变我的旗帜的价值。

请帮忙。

Answer 1

installEventFilter 期望 QObject，而在您的情况下 MainWindow_EXEC 不是。

如果您使用的是Qt Designer设计，建议创建一个新的class继承自适当的widget，并使用Qt Designer提供的class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_())

参考文献：

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

在 PyQt5 中安装 EventFilter

installEventFilter in PyQt5

python

pyqt

qt-designer

pyqt5

eventfilter