Check out the softkeys example in \NokiaQtSDK\Examples\4.6\widgets\softkeys. It has exactly what you're looking for in this code:
flags |= Qt::WindowSoftkeysVisibleHint;
flags &= ~Qt::WindowSoftkeysRespondHint;
setWindowFlags(flags); // Hides visible window
showFullScreen();
modeLabel->setText(tr("Fullscreen with softkeys"));
flags |= Qt::WindowSoftkeysVisibleHint;
flags &= ~Qt::WindowSoftkeysRespondHint;
setWindowFlags(flags); // Hides visible window
showFullScreen();
modeLabel->setText(tr("Fullscreen with softkeys"));
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