How to destroy and clear everything after closing the window?

Question

Qt

How to destroy all class objects and clear all rows and tables after closing (I use hide)? The fact is that if you return there again, then there will be information that was when the window was closed

Answer 1

Delete the window on close and re-create it when it needs to be shown.

Answer 2

Create modal dialog on stack? Something like:

void MainWindow::showSettingsDialog()
{
    QDialog settingsDialog(this);
    int result = settingsDialog.exec();
    if (result == QDialog::Accepted) {
        // Some code here
    } else if (result == QDialog::Rejected) {
        // Some code here
    }
}