gistfile1.php

<?php

namespace Drupal\layout\Plugin\layout\layout;

use Drupal\layout\Plugin\LayoutInterface;
use Drupal\Component\Plugin\PluginBase;
use Drupal\Core\Annotations\Plugin;

/**
 * @Plugin(
 *  derivative = "Drupal\layout\Plugin\Derivative\Layouts"
 * )
 */
class DefaultLayout extends PluginBase implements LayoutInterface {
  public function getRegions() {
    $definition = $this->getDefinition();
    return $definition['regions'];
  }

  public function getCss() {
    $definition = $this->getDefinition();
    drupal_add_css($definition['path'] . '/' . $definition['css']);
  }

  public function getAdminCss() {
    $definition = $this->getDefinition();
    $css = isset($definition['admin css']) ? $definition['admin css'] : $definition['css'];
    drupal_add_css($definition['path'] . '/' . $css);
  }

  public function getJs() {
    $definition = $this->getDefinition();
    if (isset($definition['js']))  {
      drupal_add_js($definition['path'] . '/' . $definition['js']);
    }
  }

  public function renderLayout(RendererInterface $renderer, $admin = FALSE) {
    $definition = $this->getDefinition();
    $regions = array();
    foreach ($this->getRegions() as $region => $title) {
      foreach ($this->configuration['regions'][$region] as $block_id => $configuration) {
        $block = block_load($block_id, $configuration);
        if ($block->access()) {
          // Need to check the caching method on the block to determine exactly
          // how we're going to get it. Should probably be abstracted out of
          // this code so that the renderer worries about it instead.
          $regions[$region][] = $block->build();
        }
      }
    }
    if (!$admin) {
      $this->getCss();
      $this->getJs();
    }
    else {
      $this->getAdminCss();
    }
    return theme($definition['layout'], $regions);
  }
}