BlockBase.php

<?php

/**
 * @file
 * Contains \Drupal\Core\Block\BlockBase.
 */

namespace Drupal\Core\Block;

use Drupal\block\BlockInterface;
use Drupal\block\Event\BlockConditionContextEvent;
use Drupal\block\Event\BlockEvents;
use Drupal\Component\Plugin\ContextAwarePluginInterface;
use Drupal\Core\Condition\ConditionAccessResolverTrait;
use Drupal\Core\Condition\ConditionPluginBag;
use Drupal\Core\Form\FormState;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Plugin\ContextAwarePluginBase;
use Drupal\Component\Utility\Unicode;
use Drupal\Component\Utility\NestedArray;
use Drupal\Core\Language\LanguageInterface;
use Drupal\Core\Cache\Cache;
use Drupal\Core\Session\AccountInterface;
use Drupal\Component\Transliteration\TransliterationInterface;

/**
 * Defines a base block implementation that most blocks plugins will extend.
 *
 * This abstract class provides the generic block configuration form, default
 * block settings, and handling for general user-defined block visibility
 * settings.
 *
 * @ingroup block_api
 */
abstract class BlockBase extends ContextAwarePluginBase implements BlockPluginInterface {

  use ConditionAccessResolverTrait;

  /**
   * The condition plugin bag.
   *
   * @var \Drupal\Core\Condition\ConditionPluginBag
   */
  protected $conditionBag;

  /**
   * The condition plugin manager.
   *
   * @var \Drupal\Core\Executable\ExecutableManagerInterface
   */
  protected $conditionPluginManager;

  /**
   * The transliteration service.
   *
   * @var \Drupal\Component\Transliteration\TransliterationInterface
   */
  protected $transliteration;

  /**
   * {@inheritdoc}
   */
  public function label() {
    if (!empty($this->configuration['label'])) {
      return $this->configuration['label'];
    }

    $definition = $this->getPluginDefinition();
    // Cast the admin label to a string since it is an object.
    // @see \Drupal\Core\StringTranslation\TranslationWrapper