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package Layout::Manager; |
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use Moose; |
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our $AUTHORITY = 'cpan:GPHAT'; |
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our $VERSION = '0.35'; |
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sub do_layout { |
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my ($self, $container) = @_; |
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die('Need a container') unless defined($container); |
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return 0 unless $container->component_count; |
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return 0 if $container->prepared && $self->_check_container($container); |
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# Layout child containers first, since we can't fit them into this one |
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# without knowing the sizes. |
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foreach my $comp (@{ $container->components }) { |
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next unless defined($comp) && $comp->visible; |
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if($comp->can('do_layout')) { |
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$comp->do_layout($comp); |
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} |
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} |
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$container->prepared(1); |
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return 1; |
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} |
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sub _check_container { |
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my ($self, $cont) = @_; |
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foreach my $comp (@{ $cont->components }) { |
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unless($comp->prepared) { |
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$cont->prepared(0); |
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return 0; |
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} |
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if($comp->can('do_layout')) { |
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if(!$self->_check_container($comp)) { |
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$comp->prepared(0); |
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return 0; |
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} |
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} |
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} |
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return 1; |
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} |
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__PACKAGE__->meta->make_immutable; |
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no Moose; |
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1; |
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__END__ |
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=head1 NAME |
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Layout::Manager - 2D Layout Management |
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=head1 SYNOPSIS |
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Layout::Manager provides a simple interface for creating layout managers, or |
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classes that size and position components within a container. |
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A few managers are provided for reference, but this module is primarily meant |
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to serve as a base for outside implementations. |
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use Layout::Manager; |
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my $foo = Layout::Manager->new; |
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$foo->do_layout($component); |
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=head1 USING A LAYOUT MANAGER |
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Layout::Manager relies on L<Graphics::Primitive::Container> as a source for |
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it's components. |
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Various implementations of Layout::Manager will require you do add components |
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with slightly different second arguments, but the general case will be: |
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$lm->add_component($comp, $constraints); |
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The contents of B<$constraints> must be discerned by reading the documentation |
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for the layout manager you are using. |
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The B<$comp> argument must be a L<Graphics::Primitive::Component>. |
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Layout manager works hand-in-hand with Graphics::Primitive, so you'll want to |
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check out the L<lifecyle|Graphics::Primitive::Component#LIFECYCLE> documented |
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in L<Graphics::Primitive::Component>. It will look something like this: |
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$cont->add_component($foo, { some => metadata }); |
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$driver->prepare($cont); |
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my $lm = new Layout::Manager::SomeImplementation; |
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$lm->do_layout($cont); |
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$driver->pack($cont); |
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$driver->draw($cont); |
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When you are ready to lay out your container, you'll need to call the |
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L<do_layout> method with a single argument: the component in which you are |
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laying things out. When I<do_layout> returns all of the components should be |
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resized and repositioned according to the rules of the Layout::Manager |
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implementation. |
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106
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=head2 PREPARATION |
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Subsequent calls to do_layout will be ignored if the Container is prepared. |
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The Container's C<prepared> flag and the flags of all it's children are |
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checked, so any modifications to B<any> child component will cause the entire |
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container (and any container children) to be laid out again. |
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=head1 WRITING A LAYOUT MANAGER |
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115
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Layout::Manager provides all the methods necessary for your implementation, |
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save the I<do_layout> method. This method will be called when it is time to |
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layout the components. |
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119
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The I<add_component> method takes two arguments: the component and a second, |
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abritrary piece of data. If your layout manager is simple, like |
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L<Compass|Layout::Manager::Compass>, you may only require a simple variable |
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like "NORTH". If you create something more complex the second argument may be |
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a hashref or an object. |
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125
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The value of the I<components> method is an arrayref of hashrefs. The |
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hashrefs have two keys: |
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128
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=over |
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130
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=item B<component> |
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132
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The component to be laid out. |
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=item B<args> |
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The argument provided to I<add_component>. |
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=back |
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140
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=head1 TIPS |
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Layout manager implementations should honor the I<visible> attribute of a |
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component, as those components need to be ignored. |
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145
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=head1 METHODS |
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147
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=head2 do_layout |
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Lays out this manager's components in the specified container. |
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151
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=head1 AUTHOR |
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153
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Cory Watson, C<< <gphat@cpan.org> >> |
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155
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=head1 SEE ALSO |
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157
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perl(1), L<Graphics::Primitive> |
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159
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=head1 COPYRIGHT & LICENSE |
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161
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Copyright 2008 - 2010 Cory G Watson |
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163
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This program is free software; you can redistribute it and/or modify it |
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under the same terms as Perl itself. |