class FieldConfigListBuilder

class FieldConfigListBuilder extends ConfigEntityListBuilder {
    
    /**
     * The name of the entity type the listed fields are attached to.
     *
     * @var string
     */
    protected $targetEntityTypeId;
    
    /**
     * The name of the bundle the listed fields are attached to.
     *
     * @var string
     */
    protected $targetBundle;
    
    /**
     * The entity type manager.
     *
     * @var \Drupal\Core\Entity\EntityTypeManagerInterface
     */
    protected $entityTypeManager;
    
    /**
     * The field type plugin manager.
     *
     * @var \Drupal\Core\Field\FieldTypePluginManagerInterface
     */
    protected $fieldTypeManager;
    
    /**
     * The entity field manager.
     *
     * @var \Drupal\Core\Entity\EntityFieldManagerInterface
     */
    protected $entityFieldManager;
    
    /**
     * Constructs a new class instance.
     *
     * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
     *   The entity type definition.
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager.
     * @param \Drupal\Core\Field\FieldTypePluginManagerInterface $field_type_manager
     *   The field type manager.
     * @param \Drupal\Core\Entity\EntityFieldManagerInterface|null $entity_field_manager
     *   The entity field manager.
     */
    public function __construct(EntityTypeInterface $entity_type, EntityTypeManagerInterface $entity_type_manager, FieldTypePluginManagerInterface $field_type_manager, EntityFieldManagerInterface $entity_field_manager) {
        parent::__construct($entity_type, $entity_type_manager->getStorage($entity_type->id()));
        $this->entityTypeManager = $entity_type_manager;
        $this->fieldTypeManager = $field_type_manager;
        $this->entityFieldManager = $entity_field_manager;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function createInstance(ContainerInterface $container, EntityTypeInterface $entity_type) {
        return new static($entity_type, $container->get('entity_type.manager'), $container->get('plugin.manager.field.field_type'), $container->get('entity_field.manager'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function render($target_entity_type_id = NULL, $target_bundle = NULL) {
        $this->targetEntityTypeId = $target_entity_type_id;
        $this->targetBundle = $target_bundle;
        $build = parent::render();
        $build['table']['#attributes']['id'] = 'field-overview';
        $build['table']['#empty'] = $this->t('No fields are present yet.');
        return $build;
    }
    
    /**
     * {@inheritdoc}
     */
    public function load() {
        $entities = array_filter($this->entityFieldManager
            ->getFieldDefinitions($this->targetEntityTypeId, $this->targetBundle), function ($field_definition) {
            return $field_definition instanceof FieldConfigInterface;
        });
        // Sort the entities using the entity class's sort() method.
        // See \Drupal\Core\Config\Entity\ConfigEntityBase::sort().
        uasort($entities, [
            $this->entityType
                ->getClass(),
            'sort',
        ]);
        return $entities;
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildHeader() {
        $header = [
            'label' => $this->t('Label'),
            'field_name' => [
                'data' => $this->t('Machine name'),
                'class' => [
                    RESPONSIVE_PRIORITY_MEDIUM,
                ],
            ],
            'field_type' => $this->t('Field type'),
        ];
        return $header + parent::buildHeader();
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildRow(EntityInterface $field_config) {
        
        /** @var \Drupal\field\FieldConfigInterface $field_config */
        $field_storage = $field_config->getFieldStorageDefinition();
        $route_parameters = [
            'field_config' => $field_config->id(),
        ] + FieldUI::getRouteBundleParameter($this->entityTypeManager
            ->getDefinition($this->targetEntityTypeId), $this->targetBundle);
        $row = [
            'id' => Html::getClass($field_config->getName()),
            'data' => [
                'label' => $field_config->getLabel(),
                'field_name' => $field_config->getName(),
                'field_type' => [
                    'data' => [
                        '#type' => 'link',
                        '#title' => $this->fieldTypeManager
                            ->getDefinitions()[$field_storage->getType()]['label'],
                        '#url' => Url::fromRoute("entity.field_config.{$this->targetEntityTypeId}_storage_edit_form", $route_parameters),
                        '#options' => [
                            'attributes' => [
                                'title' => $this->t('Edit field settings.'),
                            ],
                        ],
                    ],
                ],
            ],
        ];
        // Add the operations.
        $row['data'] = $row['data'] + parent::buildRow($field_config);
        if ($field_storage->isLocked()) {
            $row['data']['operations'] = [
                'data' => [
                    '#markup' => $this->t('Locked'),
                ],
            ];
            $row['class'][] = 'menu-disabled';
        }
        return $row;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getDefaultOperations(EntityInterface $entity) {
        
        /** @var \Drupal\field\FieldConfigInterface $entity */
        $operations = parent::getDefaultOperations($entity);
        if ($entity->access('update') && $entity->hasLinkTemplate("{$entity->getTargetEntityTypeId()}-field-edit-form")) {
            $operations['edit'] = [
                'title' => $this->t('Edit'),
                'weight' => 10,
                'url' => $entity->toUrl("{$entity->getTargetEntityTypeId()}-field-edit-form"),
                'attributes' => [
                    'title' => $this->t('Edit field settings.'),
                ],
            ];
        }
        if ($entity->access('delete') && $entity->hasLinkTemplate("{$entity->getTargetEntityTypeId()}-field-delete-form")) {
            $operations['delete'] = [
                'title' => $this->t('Delete'),
                'weight' => 100,
                'url' => $entity->toUrl("{$entity->getTargetEntityTypeId()}-field-delete-form"),
                'attributes' => [
                    'title' => $this->t('Delete field.'),
                ],
            ];
        }
        $operations['storage-settings'] = [
            'title' => $this->t('Storage settings'),
            'weight' => 20,
            'attributes' => [
                'title' => $this->t('Edit storage settings.'),
            ],
            'url' => $entity->toUrl("{$entity->getTargetEntityTypeId()}-storage-edit-form"),
        ];
        return $operations;
    }

}