As the title suggests, I have a long operation where I read file data from a thread to plot. During this, I disable the UI so the user can't click. However, I'm unable to disable my Qwt plot.

I've tried:

QwtPlot->setEnabled(false);
QwtPlot->canvas()->setEnabled(false);

Neither disable (aka gray-out) the plot area.

Is there a way to disable the plot area?

Thanks )