How do I add a QGridlayout in a QMainwindow?

I know how to add a QGridlayout in a QDialog but...

Is it possible to ad a QGridlayout to a QMainwindow without subclassing/inheriting QMainwindow?
How do I do this?

Tnx

Set the layout on a plain QWidget and set it as a central widget of the main window.

Code:

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QWidget* widget = new QWidget(mainWindow);
widget->setLayout(gridLayout);
mainWindow->setCentralWidget(widget);

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Tnx J-P Nurmi,

It works, but...
In the console I get the message:
QLayout: Attempting to add QLayout "" to QMainWindow "", which already has a layout

Despite this message it seems to work. Do you know I can prevent this message?

Quote:

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Originally Posted by Teuniz

In the console I get the message:
QLayout: Attempting to add QLayout "" to QMainWindow "", which already has a layout

Despite this message it seems to work. Do you know I can prevent this message?

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Do you pass the main window as a parent for the QGridLayout? That means same than setting the layout on the main window. So either don't pass any parent or pass the central widget as a parent for the grid layout.

Yep, you are right. Thanks a lot for your help J-P.