NAME

FLTK::Theme -

Description

When redrawing your widgets you should look at the damage bits to see what parts of your widget need redrawing. The Widget::handle() method can then set individual damage bits to limit the amount of drawing that needs to be done, and the Widget::draw() method can test these bits to decide what to draw:

  package MyClass;

  sub handle {
      my ($self, $event) =@_;
      $self->damage(1) if change_to_part1();
      $self->damage(2) if change_to_part2();
      $self->damage(3) if change_to_part3();
  }

  sub draw {
      my ($self) = @_;
      if ($self->damage() & DAMAGE_ALL()) {
          # draw frame/box and other static stuff...
      }
      draw_part1() if ($self->damage() & (DAMAGE_ALL() | 1));
      draw_part2() if ($self->damage() & (DAMAGE_ALL() | 2));
      draw_part3() if ($self->damage() & (DAMAGE_ALL() | 4));
  }

Author

Sanko Robinson <sanko@cpan.org> - http://sankorobinson.com/

License and Legal

Copyright (C) 2008-2010 by Sanko Robinson <sanko@cpan.org>

This program is free software; you can redistribute it and/or modify it under the terms of The Artistic License 2.0. See the LICENSE file included with this distribution or notes on the Artistic License 2.0 for clarification.

When separated from the distribution, all original POD documentation is covered by the Creative Commons Attribution-Share Alike 3.0 License. See the clarification of the CCA-SA3.0.