Repeated triggering of the closeEvent phenomenon

[TSummerDay]

import sys

from PyQt6.QtCore import QRect
from PyQt6 import  QtCore
from PyQt6.QtGui import QIcon
from PyQt6.QtWidgets import QApplication, QMainWindow, QPushButton, QWidget
from PyQt6.QtCore import Qt
from PyQt6.QtWidgets import QMessageBox
from PyQt6 import QtGui

class Utils:
    @staticmethod
    def popup_message(title, message, buttons=None, icon=QMessageBox.Icon.Critical, left_btn=None, right_btn=None,
                      parent_window=None):
        msg = QMessageBox()
        msg.setWindowTitle(title)
        msg.setText(message)
        msg.setStyleSheet("QLabel { color: rgba(34, 34, 34, 255);}")
        msg.setIcon(icon)
        msg.setWindowFlag(QtCore.Qt.WindowType.Dialog)
        if parent_window is not None:
            width = len(message) * 20 // 2 if len(message) < 30 else (30 * 20 // 2)
            pos_x = parent_window.x() + parent_window.width() // 2 - width
            pos_y = parent_window.y() + parent_window.height() // 2 - 100
            msg.move(pos_x, pos_y)
        if left_btn is not None and right_btn is not None:
            msg.addButton(left_btn, QMessageBox.ButtonRole.AcceptRole)
            msg.addButton(right_btn, QMessageBox.ButtonRole.AcceptRole)
            ret = msg.exec()
            return ret
        else:
            msg.setStandardButtons(buttons)
            ret = msg.exec()
            return QMessageBox.StandardButton(ret)

class NavigationWindow(QMainWindow):
    def __init__(self):
        super(NavigationWindow, self).__init__()
        self.setup_window()

    def setup_window(self):
        # 创建一个1*1，任务栏不可见的窗口
        self.setFixedSize(1, 1)
        self.setWindowFlags(Qt.WindowType.Tool)

    def closeEvent(self, ev: QtGui.QCloseEvent) -> None:
        print("closeEvent")
        ev.ignore()
        ret = Utils.popup_message(title="退出", message='@NavigationWindow.exit_prompt',
                                  buttons=QMessageBox.StandardButton.Ok | QMessageBox.StandardButton.No,
                                  icon=QMessageBox.Icon.Question,
                                  parent_window=self)
        if ret == QMessageBox.StandardButton.No:
            return None
        ev.accept()
        super().closeEvent(ev)

if __name__ == '__main__':
    app = QApplication(sys.argv)

    window = NavigationWindow()
    window.show()
    msg = QMessageBox()
    title = "提示"
    message = "是否唤起完整功能界面？"
    buttons = QMessageBox.StandardButton.Ok | QMessageBox.StandardButton.No
    icon = QMessageBox.Icon.Question
    msg.setWindowTitle(title)
    msg.setText(message)
    msg.setStyleSheet("QLabel { color: rgba(34, 34, 34, 255);}")
    msg.setIcon(icon)
    msg.setWindowFlag(QtCore.Qt.WindowType.Dialog)
    msg.setStandardButtons(buttons)
    ret = msg.exec()
    # Start the event loop.
    window_flags = window.windowFlags()
    window_flags &= ~Qt.WindowType.Tool
    window.setWindowFlags(window_flags)
    WINDOW_WIDTH = 1440
    WINDOW_HEIGHT = 906
    window.setFixedSize(1440, 906)
    window.show()
    app.exec()

1.Create a subclass NavigationWindow of QMainWindow: In the initialization, set it as a tool window.
2.Create a NavigationWindow window: Instantiate the NavigationWindow class.
3.Display a QMessageBox: Prompt whether to display the window.
4.Set NavigationWindow as a non-tool window: Change the window flags of the NavigationWindow instance so that it is no longer a tool window.
5.Close the NavigationWindow and display a QMessageBox: Show a message box when the NavigationWindow is closed.
6.Choose 'No', the popup disappears, and the closeEvent of NavigationWindow is triggered again: If 'No' is selected in the message box, the closeEvent of NavigationWindow continues to be triggered.
7.Repeat Step 6 in a loop: Continuously repeat the action in Step 6.

[jsulm]

@TSummerDay said in Repeated triggering of the closeEvent phenomenon:

super().closeEvent(ev)

You do not call this if No is selected