If you may limit your application to Unix/X11, then you could make use of the Tk::InputO widget. This is basically a widget which takes input, but is invisible otherwise. You would put an InputO widget all over the application and put a cancel button on top of the InputO.

But, unfortunately, this is Unix-only.

In reply to Re^3: PerlTk Busy vs. update by eserte
in thread PerlTk Busy vs. update by Anonymous Monk

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