[qt5] handling close event - msg box

msgbox.py

__author__ = "tom"

import sys
from PyQt5.QtWidgets import QWidget, QMessageBox, QApplication


class Example(QWidget):
    def __init__(self):
        super().__init__()
        self.init_ui()

    def initUi(self):
        self.setGeometry(300, 300, 250, 150)
        self.setWindowTitle('Message box')
        self.show()

    def closeEvent(self, event):
        reply = QMessageBox.question(self, 'Message',
                                     "Are you sure to quit?", QMessageBox.Yes |
                                     QMessageBox.No, QMessageBox.No)
        if reply == QMessageBox.Yes:
            event.accept()
        else:
            event.ignore()


if __name__ == "__main__":
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())