Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\language\Plugin\Block;
Chris@0: 
Chris@0: use Drupal\Core\Access\AccessResult;
Chris@0: use Drupal\Core\Block\BlockBase;
Chris@0: use Drupal\Core\Path\PathMatcherInterface;
Chris@0: use Drupal\Core\Session\AccountInterface;
Chris@0: use Drupal\Core\Language\LanguageManagerInterface;
Chris@0: use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
Chris@0: use Drupal\Core\Url;
Chris@0: use Symfony\Component\DependencyInjection\ContainerInterface;
Chris@0: 
Chris@0: /**
Chris@0:  * Provides a 'Language switcher' block.
Chris@0:  *
Chris@0:  * @Block(
Chris@0:  *   id = "language_block",
Chris@0:  *   admin_label = @Translation("Language switcher"),
Chris@0:  *   category = @Translation("System"),
Chris@0:  *   deriver = "Drupal\language\Plugin\Derivative\LanguageBlock"
Chris@0:  * )
Chris@0:  */
Chris@0: class LanguageBlock extends BlockBase implements ContainerFactoryPluginInterface {
Chris@0: 
Chris@0:   /**
Chris@0:    * The language manager.
Chris@0:    *
Chris@0:    * @var \Drupal\Core\Language\LanguageManagerInterface
Chris@0:    */
Chris@0:   protected $languageManager;
Chris@0: 
Chris@0:   /**
Chris@0:    * The path matcher.
Chris@0:    *
Chris@0:    * @var \Drupal\Core\Path\PathMatcherInterface
Chris@0:    */
Chris@0:   protected $pathMatcher;
Chris@0: 
Chris@0:   /**
Chris@0:    * Constructs an LanguageBlock object.
Chris@0:    *
Chris@0:    * @param array $configuration
Chris@0:    *   A configuration array containing information about the plugin instance.
Chris@0:    * @param string $plugin_id
Chris@0:    *   The plugin_id for the plugin instance.
Chris@0:    * @param mixed $plugin_definition
Chris@0:    *   The plugin implementation definition.
Chris@0:    * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
Chris@0:    *   The language manager.
Chris@0:    * @param \Drupal\Core\Path\PathMatcherInterface $path_matcher
Chris@0:    *   The path matcher.
Chris@0:    */
Chris@0:   public function __construct(array $configuration, $plugin_id, $plugin_definition, LanguageManagerInterface $language_manager, PathMatcherInterface $path_matcher) {
Chris@0:     parent::__construct($configuration, $plugin_id, $plugin_definition);
Chris@0:     $this->languageManager = $language_manager;
Chris@0:     $this->pathMatcher = $path_matcher;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
Chris@0:     return new static(
Chris@0:       $configuration,
Chris@0:       $plugin_id,
Chris@0:       $plugin_definition,
Chris@0:       $container->get('language_manager'),
Chris@0:       $container->get('path.matcher')
Chris@0:     );
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   protected function blockAccess(AccountInterface $account) {
Chris@0:     $access = $this->languageManager->isMultilingual() ? AccessResult::allowed() : AccessResult::forbidden();
Chris@0:     return $access->addCacheTags(['config:configurable_language_list']);
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function build() {
Chris@0:     $build = [];
Chris@0:     $route_name = $this->pathMatcher->isFrontPage() ? '<front>' : '<current>';
Chris@0:     $type = $this->getDerivativeId();
Chris@0:     $links = $this->languageManager->getLanguageSwitchLinks($type, Url::fromRoute($route_name));
Chris@0: 
Chris@0:     if (isset($links->links)) {
Chris@0:       $build = [
Chris@0:         '#theme' => 'links__language_block',
Chris@0:         '#links' => $links->links,
Chris@0:         '#attributes' => [
Chris@0:           'class' => [
Chris@0:             "language-switcher-{$links->method_id}",
Chris@0:           ],
Chris@0:         ],
Chris@0:         '#set_active_class' => TRUE,
Chris@0:       ];
Chris@0:     }
Chris@0:     return $build;
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    *
Chris@0:    * @todo Make cacheable in https://www.drupal.org/node/2232375.
Chris@0:    */
Chris@0:   public function getCacheMaxAge() {
Chris@0:     return 0;
Chris@0:   }
Chris@0: 
Chris@0: }