setCentralWidget() without deleting prev widget

Hello. Sorry for my bad english..

How can I call setCetralWidget() that previous widget wasn't deleted?

it is the realization of setCentralWidget():
void QMainWindow::setCentralWidget(QWidget *widget)

1. {
2. Q_D(QMainWindow);
3. if (d->layout->centralWidget() && d->layout->centralWidget() != widget) {
4. d->layout->centralWidget()->hide();
5. d->layout->centralWidget()->deleteLater();
6. }
7. d->layout->setCentralWidget(widget);
8. }

so, setCentralWidget always call method deleteLater().

There is some ways to do it, for example:
centralWidget()->setParent(NULL);
//then we can use setCentralWidget()

1) Is there some other ways to do it?
2) Hmm.. can I redefenition deleteLater() in centralWidget()?

Can you describe what you want to do?
Why do you want to delete the central widget?

If you want your screen to look different at some point, you can try QStackedWidget

No, I don't want to delete central widget.
when I call setCentralWidget(), previous widget will be deleted automatically

I want to place several widgets to my QMainWindow.
One at the time

Ohh, ok.

Set a QStackedWidget as your central widget, then you can add multiple "central widgets"'.
http://doc.qt.nokia.com/4.6/qstackedwidget.html

I need to add one widget to centralWidget, not multiple..
Just I need that setCentralWidget() don't delete previous widget, because I will use this widget later.
QStackedWidget can do this work?

If I were you, I would already have checked the documentation of QStackedWidget

I have read this before, but I have forgotten this.
Ok. I'll check the documentation of QStackedWidget, thanks!