Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\Core\Layout;
Chris@0: 
Chris@0: use Drupal\Component\Utility\NestedArray;
Chris@0: use Drupal\Core\Plugin\PluginBase;
Chris@0: 
Chris@0: /**
Chris@0:  * Provides a default class for Layout plugins.
Chris@0:  */
Chris@0: class LayoutDefault extends PluginBase implements LayoutInterface {
Chris@0: 
Chris@0:   /**
Chris@0:    * The layout definition.
Chris@0:    *
Chris@0:    * @var \Drupal\Core\Layout\LayoutDefinition
Chris@0:    */
Chris@0:   protected $pluginDefinition;
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function __construct(array $configuration, $plugin_id, $plugin_definition) {
Chris@0:     parent::__construct($configuration, $plugin_id, $plugin_definition);
Chris@0:     $this->setConfiguration($configuration);
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function build(array $regions) {
Chris@0:     // Ensure $build only contains defined regions and in the order defined.
Chris@0:     $build = [];
Chris@0:     foreach ($this->getPluginDefinition()->getRegionNames() as $region_name) {
Chris@0:       if (array_key_exists($region_name, $regions)) {
Chris@0:         $build[$region_name] = $regions[$region_name];
Chris@0:       }
Chris@0:     }
Chris@0:     $build['#settings'] = $this->getConfiguration();
Chris@0:     $build['#layout'] = $this->pluginDefinition;
Chris@0:     $build['#theme'] = $this->pluginDefinition->getThemeHook();
Chris@0:     if ($library = $this->pluginDefinition->getLibrary()) {
Chris@0:       $build['#attached']['library'][] = $library;
Chris@0:     }
Chris@0:     return $build;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function getConfiguration() {
Chris@0:     return $this->configuration;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function setConfiguration(array $configuration) {
Chris@0:     $this->configuration = NestedArray::mergeDeep($this->defaultConfiguration(), $configuration);
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function defaultConfiguration() {
Chris@0:     return [];
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function calculateDependencies() {
Chris@0:     return [];
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    *
Chris@0:    * @return \Drupal\Core\Layout\LayoutDefinition
Chris@0:    */
Chris@0:   public function getPluginDefinition() {
Chris@0:     return parent::getPluginDefinition();
Chris@0:   }
Chris@0: 
Chris@0: }