You need to 'update' the screen before the callback runs, like this:

#
# Sets the cursor to the 'busy' cursor
#
$mw->Busy(-recurse => 1);
$mw->update();
#
# Callback code goes here
#
$mw->Unbusy;
$mw->update();

[download]

You aren't limited to just setting the 'busy' cursor - you can change widget colors, disable the button, etc. But you need to refresh the screen or else you won't see your changes.

Pat

In reply to Re: Tk button appearance while its callback runs by BlueBlazerRegular
in thread Tk button appearance while its callback runs by ff

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