mainwindow does not refresh

[edb]

I put my lengthy process in a thread and now the refreshing works but the widget from which the thread was started should be disabled during the execution of the thread. With refreshing I only mean the visual aspect, ie the widget shows all its colors and buttons. It may not seem as if it crashed.

How can I do this? Can I disable the widget and if so: how do I check whether the thread has finished. I tryed putting a loop after starting the thread that does nothing and only exits when finished() is true, but that didn't work:

while (!myThread.finished())
             {
             }

while (!myThread.finished())
             {
             }

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How can I let my main program wait for the thread to finish whithout loosing the refreshing of the main window?