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When programming Tk, it's almost always a good idea to keep a reference to the
widgets that you created in the interface. Most of the time, a simple hash is
enough; but it is usually wrapped up in methods to make the hash private to the
window object. And of course, those methods are duplicated in all modules, under
a form or another.
Since duplication is bad, this module implements a Moose role implementing those
methods once and forever. This implies that your class is using Moose in order
to consume the role.
WWW: https://metacpan.org/release/Tk-Role-HasWidgets
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