How to signal when a Qwidget receive focus

[franco.amato]

Hi,
I would signal to a QLed when a QWidget receive focus to accept keyboard input.
Something as:

connect( MyWidget, SIGNAL( focusReceived(bool) ),MyQLed, SLOT(setValue(bool)) );

connect( MyWidget, SIGNAL( focusReceived(bool) ),MyQLed, SLOT(setValue(bool)) );

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but seems that QWidets class doesn't have such signal.
How can I do?

Best