Text::ProgressBar::Widget - A role that defines anything that is a widget
This is the role or the abstract base class for all widgets.
informs the ProgressBar that it should be updated
main method, it will be overwrite from concrete classes
<farhad at cpan.org>
Copyright 2012 Farhad Fouladi.
This program is free software; you can redistribute it and/or modify it under the terms of either: the GNU General Public License as published by the Free Software Foundation; or the Artistic License.
See http://dev.perl.org/licenses/ for more information.