Function update_progress_bar

examples/scanfrequency-gui.py:52–54

(new, old)

    progress = main.findChild((QtGui.QWidget, ), 'progress')

    def update_progress_bar(new, old):
        fraction = (new.magnitude - start.value()) / (stop.value() - start.value())
        progress.setValue(fraction * 100)

    inst.frequency_changed.connect(update_progress_bar)