QLayout: Attempting to add QLayout ...

[broadpeak]

I have the following warning:
QLayout: Attempting to add QLayout "" to MainWindow "MainWindow", which already has a layout

I use no layout elsewhere...

my code:
@
void MainWindow::createVMGridView()
{
QGridLayout* layout = new QGridLayout(this);
QImage img(":/images/tunnel.png");

for( int row = 0; row < 3; row++ )
{
    for( int column = 0; column < 3; column++)
    {
        QLabel* label = new QLabel(this);
        label->setPixmap(QPixmap::fromImage(img));
        layout->addWidget(label, row, column);
        label->setAlignment( Qt::AlignCenter );
        label->setSizePolicy(QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding ) );

    } // inner for
} // outer for

// camera panel
ui->label_14->setLayout(layout);

}
@

Any ideas?

[JKSH]

QMainWindow has a pre-set layout. It's shown here: http://qt-project.org/doc/qt-4.8/QMainWindow.html#qt-main-window-framework

You probably want to create a "central widget" for the QMainWindow, and add the layout to that widget

[Rahul Das]

Add label to your lay out, and set layout for your Mainwindow.

[broadpeak]

[quote author="Rahul Das" date="1345201297"]Add label to your lay out, and set layout for your Mainwindow.[/quote]

This is not clear for me....

I have:
QMainWindow
centralWidget as QWidget
QStackedWidget
page5 of QStackedWidget there is a Qframe
on the QFrame I have THE QLabel (ui->label_14)

What's wrong with the layout?

[lgeyer]

Nothing. The problematic line is <code>QGridLayout* layout = new QGridLayout(this)</code>, which constructs a layout passing <code>this</code> as parent, which, in further consequence, sets the so created layout for <code>this</code>, the QMainWindow instance, which already has a layout.