PyQt5 closeEvent method

问题:

I'm currently learning how to build an application with pyqt5 and encountered some problem with closeEvent method, overriden so user gets asked for confirmation by QMessageBox object. It seems working well with X button - event gets 'accepted' when action is confirmed and 'canceled' when cancel button is clicked. However, when I use my Quit button from dropdown File menu, no matter which button I click, program gets closed with exit code 1. Seems strange, because I use same closeEvent method in both cases.

import sys

from PyQt5.QtWidgets import QApplication, QMessageBox, QMainWindow, QAction


class window(QMainWindow):
    def __init__(self):

        super().__init__()

    def createUI(self):


        self.setGeometry(500, 300, 700, 700)

        self.setWindowTitle("window")


        quit = QAction("Quit", self)
        quit.triggered.connect(self.closeEvent)

        menubar = self.menuBar()
        fmenu = menubar.addMenu("File")
        fmenu.addAction(quit)

    def closeEvent(self, event):
        close = QMessageBox()
        close.setText("You sure?")
        close.setStandardButtons(QMessageBox.Yes | QMessageBox.Cancel)
        close = close.exec()

        if close == QMessageBox.Yes:
            event.accept()
        else:
            event.ignore()

main = QApplication(sys.argv)
window = window()
window.createUI()
window.show()
sys.exit(main.exec_())

Thanks for suggestions!

回答1:

When you click button then program calls your function but with different event object which doesn't have accept() and ignore() so you get error message and program ends with exit code 1.

You can assign self.close and program will call closeEvent() with correct event object.

quit.triggered.connect(self.close)

回答2:

The problem is accept is a method while ignore is just an attribute.
This code works for me:

def closeEvent(self, event):
            close = QtWidgets.QMessageBox.question(self,
                                         "QUIT",
                                         "Are you sure want to stop process?",
                                         QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No)
            if close == QtWidgets.QMessageBox.Yes:
                event.accept()
            else:
                event.ignore