www.aleph1.co.uk Git - yaffs-website/blob - web/core/modules/language/src/Plugin/Block/LanguageBlock.php

   1 <?php
   2
   3 namespace Drupal\language\Plugin\Block;
   4
   5 use Drupal\Core\Access\AccessResult;
   6 use Drupal\Core\Block\BlockBase;
   7 use Drupal\Core\Path\PathMatcherInterface;
   8 use Drupal\Core\Session\AccountInterface;
   9 use Drupal\Core\Language\LanguageManagerInterface;
  10 use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
  11 use Drupal\Core\Url;
  12 use Symfony\Component\DependencyInjection\ContainerInterface;
  13
  14 /**
  15  * Provides a 'Language switcher' block.
  16  *
  17  * @Block(
  18  *   id = "language_block",
  19  *   admin_label = @Translation("Language switcher"),
  20  *   category = @Translation("System"),
  21  *   deriver = "Drupal\language\Plugin\Derivative\LanguageBlock"
  22  * )
  23  */
  24 class LanguageBlock extends BlockBase implements ContainerFactoryPluginInterface {
  25
  26   /**
  27    * The language manager.
  28    *
  29    * @var \Drupal\Core\Language\LanguageManagerInterface
  30    */
  31   protected $languageManager;
  32
  33   /**
  34    * The path matcher.
  35    *
  36    * @var \Drupal\Core\Path\PathMatcherInterface
  37    */
  38   protected $pathMatcher;
  39
  40   /**
  41    * Constructs an LanguageBlock object.
  42    *
  43    * @param array $configuration
  44    *   A configuration array containing information about the plugin instance.
  45    * @param string $plugin_id
  46    *   The plugin_id for the plugin instance.
  47    * @param mixed $plugin_definition
  48    *   The plugin implementation definition.
  49    * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
  50    *   The language manager.
  51    * @param \Drupal\Core\Path\PathMatcherInterface $path_matcher
  52    *   The path matcher.
  53    */
  54   public function __construct(array $configuration, $plugin_id, $plugin_definition, LanguageManagerInterface $language_manager, PathMatcherInterface $path_matcher) {
  55     parent::__construct($configuration, $plugin_id, $plugin_definition);
  56     $this->languageManager = $language_manager;
  57     $this->pathMatcher = $path_matcher;
  58   }
  59
  60
  61   /**
  62    * {@inheritdoc}
  63    */
  64   public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
  65     return new static(
  66       $configuration,
  67       $plugin_id,
  68       $plugin_definition,
  69       $container->get('language_manager'),
  70       $container->get('path.matcher')
  71     );
  72   }
  73
  74
  75   /**
  76    * {@inheritdoc}
  77    */
  78   protected function blockAccess(AccountInterface $account) {
  79     $access = $this->languageManager->isMultilingual() ? AccessResult::allowed() : AccessResult::forbidden();
  80     return $access->addCacheTags(['config:configurable_language_list']);
  81   }
  82
  83   /**
  84    * {@inheritdoc}
  85    */
  86   public function build() {
  87     $build = [];
  88     $route_name = $this->pathMatcher->isFrontPage() ? '<front>' : '<current>';
  89     $type = $this->getDerivativeId();
  90     $links = $this->languageManager->getLanguageSwitchLinks($type, Url::fromRoute($route_name));
  91
  92     if (isset($links->links)) {
  93       $build = [
  94         '#theme' => 'links__language_block',
  95         '#links' => $links->links,
  96         '#attributes' => [
  97           'class' => [
  98             "language-switcher-{$links->method_id}",
  99           ],
 100         ],
 101         '#set_active_class' => TRUE,
 102       ];
 103     }
 104     return $build;
 105   }
 106
 107   /**
 108    * {@inheritdoc}
 109    *
 110    * @todo Make cacheable in https://www.drupal.org/node/2232375.
 111    */
 112   public function getCacheMaxAge() {
 113     return 0;
 114   }
 115
 116 }