Python PyQt close window confirmation

Python PyQt Connecting Signals to Slots: Exercise-11 with Solution

Write a Python program that creates a window for an application. When you try to close the window (like clicking the X button), it should check if you're sure you want to close the application and ask for confirmation. Use the PyQt module.

From doc.qt.io:

QApplication Class: The QApplication class manages the GUI application's control flow and main settings.

QMainWindow Class: The QMainWindow class provides a main application window.

QMessageBox Class: The QMessageBox class provides a modal dialog for informing the user or for asking the user a question and receiving an answer.

Sample Solution:

Python Code:

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

class MyMainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        self.setWindowTitle("Close Confirmation")
        self.setGeometry(100, 100, 400, 200)  # (x, y, width, height)

    def closeEvent(self, event):
        # Ask for confirmation before closing
        confirmation = QMessageBox.question(self, "Confirmation", "Are you sure you want to close the application?", QMessageBox.Yes | QMessageBox.No)

        if confirmation == QMessageBox.Yes:
            event.accept()  # Close the app
        else:
            event.ignore()  # Don't close the app

def main():
    app = QApplication(sys.argv)
    window = MyMainWindow()
    window.show()
    sys.exit(app.exec_())

if __name__ == "__main__":
    main()

Explanation:

In the exercise above -

• Import the necessary modules from PyQt5.
• Create a custom "QMainWindow" class named "MyMainWindow" that sets up the main application window.
• Override the closeEvent method to handle window close events.
• Inside the "closeEvent()" method, it displays a confirmation dialog asking if you're sure you want to close the application.
• If you click "Yes" in the confirmation dialog, it accepts the close event, and the application closes. If you click "No," it ignores the close event, and the application stays open.
• In the main function, we create the PyQt application, instantiate the "MyMainWindow" class, and show the main window.

Output:

Flowchart:

Python Code Editor:

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