Graphics::Primitive::ComponentList3pm

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.