Graphics::Primitive::ComponentList(3p)

NAME
Graphics::Primitive::ComponentList - List of Components

DESCRIPTION
Maintains a list of components and their constraints. This is implemented as a class to provide functionality above and beyond a simple array.

SYNOPSIS
  my $c = Graphics::Primitive::ComponentList->new;
  $c->add_component($comp, $constraint);

  my $cindex = $c->find_component($comp->name);

METHODS

  Constructor

new Creates a new Container.

  Instance Methods

add_component ($component, $constraint)
    Add a component to the list. Returns a true value if the component was added successfully. A second argument may be required, please consult the POD for your specific layout manager implementation.

    Before the component is added, it is passed to the validate_component method. If validate_component does not return a true value, then the component is not added.

clear
    Reset components and constraints to empty arrayrefs.

component_count
    Returns the number of components in this list.

constraint_count
    Returns the number of constraints in this list.

each
    Calls the supplied CODEREF for each component in this list, passing the component and it's constraints as arguments.

      my $flist = $list->each(
        sub{
            my ($component, $constraint) = @_; $comp->class('foo)
        }
      );

find
    Returns a new ComponentList containing only the components for which the supplied CODEREF returns true. The coderef is called for each component and is passed the component and it's constraints. Undefined components (the ones left around after a remove_component) are automatically skipped.

      my $flist = $list->find(
        sub{
          my ($component, $constraint) = @_; return $comp->class eq 'foo'
        }
      );

    If no matching components are found then a new list is returned so that simple calls liked $container->find(...)->each(...) don't explode.

find_component
    Returns the index of the first component with the supplied name. Returns undef if no component with that name is found.

get_component
    Get the component at the specified index.

get_constraint
    Get the constraint at the specified index.

remove_component
    Removes a component and it's constraint. Components must have names to be removed. Returns an arrayref of Components that were removed.

AUTHOR
Copyright 2008-2009 by Cory G Watson.

BUGS
Please report any bugs or feature requests to "bug-geometry-primitive at rt.cpan.org", or through the web interface at <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Geometry-Primitive>. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

COPYRIGHT & LICENSE
Copyright 2008-2009 by Cory G Watson.

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.