如何防止打印按钮在打印后关闭QPrintPreviewDialog

from PyQt5.QtWidgets import QPrintPreviewDialog, QMessageBox

class MyPrintPreviewDialog(QPrintPreviewDialog):
    def closeEvent(self, event):
        if self.printButton().isChecked():
            reply = QMessageBox.question(self, '确认关闭', '打印按钮已按下，确认关闭对话框吗？',
                                         QMessageBox.Yes | QMessageBox.No, QMessageBox.No)
            if reply == QMessageBox.Yes:
                super().closeEvent(event)
            else:
                event.ignore()
        else:
            super().closeEvent(event)