[email protected] wrote:
> I've been using FLTK to wrapper very complex engineering calculations..

        See Fl::check():
        http://fltk.org/documentation.php/doc-1.1/Fl.html#Fl.check

        Call Fl::check(); within your calculation so that FLTK
        can have some CPU to keep the interface alive.

        Or, run your calculation in a child thread, so that
        Fl::run() can run in the main thread to keep the interface alive.

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