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PyQt: clicking X does not call closeEvent

I am new to PyQt trying to develop a simple application. I developed a simple ui with a Qt designer. I want to receive additional confirmation if the user really wants to exit the application by pressing the X or "Exit" button or select "Exit menu".

Here is the code:

import sys
from PyQt4 import QtGui, QtCore, uic

class MainWindow(QtGui.QMainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)

        self.ui = uic.loadUi('main_window.ui')
        self.ui.show()

        self.ui.btnExit.clicked.connect(self.close)
        self.ui.actionExit.triggered.connect(self.close)

    def closeEvent(self, event):
        print("event")
        reply = QtGui.QMessageBox.question(self, 'Message',
            "Are you sure to quit?", QtGui.QMessageBox.Yes, QtGui.QMessageBox.No)

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


def main():
    app = QtGui.QApplication(sys.argv)
    win = MainWindow()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

The problem is that:

  • When I click X in the main window, the closeEvent function does not fire
  • When I click the "Exit" button or select "Exit" from the menu, the function, but pressing the "Yes" button does not close the application.

I found some questions about SO and searched for tutorials, but nothing related to such a problem. What am I doing wrong?

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4 answers

Notice what you do:

self.ui = uic.loadUi('main_window.ui')
self.ui.show()

(ui) win. win. closeEvent.

loadUi .ui .

PyQt4.uic.loadUi(uifile[, baseinstance=None[, package='']])

. :

import sys
from PyQt4 import QtGui, QtCore, uic

class MainWindow(QtGui.QMainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)

        uic.loadUi('main_window.ui', self)

        self.btnExit.clicked.connect(self.close)
        self.actionExit.triggered.connect(self.close)

    def closeEvent(self, event):
        print("event")
        reply = QtGui.QMessageBox.question(self, 'Message',
            "Are you sure to quit?", QtGui.QMessageBox.Yes, QtGui.QMessageBox.No)

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


def main():
    app = QtGui.QApplication(sys.argv)
    win = MainWindow()
    win.show()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

. show __init__. . , main. .

+10

,

self.ui.closeEvent = self.closeEvent

:

import sys
from PyQt4 import QtGui, QtCore, uic

class MainWindow(QtGui.QMainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)

        self.ui = uic.loadUi('main_window.ui')
        self.ui.closeEvent = self.closeEvent
        self.ui.show()

        self.ui.btnExit.clicked.connect(self.close)
        self.ui.actionExit.triggered.connect(self.close)

    def closeEvent(self, event):
        print("event")
        reply = QtGui.QMessageBox.question(self, 'Message',
            "Are you sure to quit?", QtGui.QMessageBox.Yes, QtGui.QMessageBox.No)

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


def main():
    app = QtGui.QApplication(sys.argv)
    win = MainWindow()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()
+4

, python, event- > slot .

0

Another simple solution for this is to use to run the code in the function whenever the user clicks the close button. app.aboutToQuit.connect(self.close_event)closeEvent

Sample code here

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

#--------------------------------------------------------------------------------

        app.aboutToQuit.connect(self.closeEvent) #this line is what ur looking for !!!!!!

#--------------------------------------------------------------------------------

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle('Demo')

    #{______________________________________

    def closeEvent(self):
        #Your code here
        print('User has pressed the close button')
        import sys
        sys.exit(0)

    #}______________________________________


if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    MainWindow = QtGui.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
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