--- /dev/null
+<?php
+
+namespace Drupal\field_ui\Form;
+
+use Drupal\Core\Config\Entity\ConfigEntityInterface;
+use Drupal\Core\Entity\EntityDeleteForm;
+use Drupal\Core\Entity\EntityManagerInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Render\Element;
+use Drupal\field_ui\FieldUI;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a form for removing a field from a bundle.
+ */
+class FieldConfigDeleteForm extends EntityDeleteForm {
+
+ /**
+ * The entity manager.
+ *
+ * @var \Drupal\Core\Entity\EntityManagerInterface
+ */
+ protected $entityManager;
+
+ /**
+ * Constructs a new FieldConfigDeleteForm object.
+ *
+ * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
+ * The entity manager.
+ */
+ public function __construct(EntityManagerInterface $entity_manager) {
+ $this->entityManager = $entity_manager;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container) {
+ return new static(
+ $container->get('entity.manager')
+ );
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildForm(array $form, FormStateInterface $form_state) {
+ $form = parent::buildForm($form, $form_state);
+
+ // If we are adding the field storage as a dependency to delete, then that
+ // will list the field as a dependency. That is confusing, so remove it.
+ // Also remove the entity type and the whole entity deletions details
+ // element if nothing else is in there.
+ if (isset($form['entity_deletes']['field_config']['#items']) && isset($form['entity_deletes']['field_config']['#items'][$this->entity->id()])) {
+ unset($form['entity_deletes']['field_config']['#items'][$this->entity->id()]);
+ if (empty($form['entity_deletes']['field_config']['#items'])) {
+ unset($form['entity_deletes']['field_config']);
+ if (!Element::children($form['entity_deletes'])) {
+ $form['entity_deletes']['#access'] = FALSE;
+ }
+ }
+ }
+ return $form;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function getConfigNamesToDelete(ConfigEntityInterface $entity) {
+ /** @var \Drupal\field\FieldStorageConfigInterface $field_storage */
+ $field_storage = $entity->getFieldStorageDefinition();
+ $config_names = [$entity->getConfigDependencyName()];
+
+ // If there is only one bundle left for this field storage, it will be
+ // deleted too, notify the user about dependencies.
+ if (count($field_storage->getBundles()) <= 1) {
+ $config_names[] = $field_storage->getConfigDependencyName();
+ }
+ return $config_names;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getCancelUrl() {
+ return FieldUI::getOverviewRouteInfo($this->entity->getTargetEntityTypeId(), $this->entity->getTargetBundle());
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitForm(array &$form, FormStateInterface $form_state) {
+ $field_storage = $this->entity->getFieldStorageDefinition();
+ $bundles = $this->entityManager->getBundleInfo($this->entity->getTargetEntityTypeId());
+ $bundle_label = $bundles[$this->entity->getTargetBundle()]['label'];
+
+ if ($field_storage && !$field_storage->isLocked()) {
+ $this->entity->delete();
+ drupal_set_message($this->t('The field %field has been deleted from the %type content type.', ['%field' => $this->entity->label(), '%type' => $bundle_label]));
+ }
+ else {
+ drupal_set_message($this->t('There was a problem removing the %field from the %type content type.', ['%field' => $this->entity->label(), '%type' => $bundle_label]), 'error');
+ }
+
+ $form_state->setRedirectUrl($this->getCancelUrl());
+
+ // Fields are purged on cron. However field module prevents disabling modules
+ // when field types they provided are used in a field until it is fully
+ // purged. In the case that a field has minimal or no content, a single call
+ // to field_purge_batch() will remove it from the system. Call this with a
+ // low batch limit to avoid administrators having to wait for cron runs when
+ // removing fields that meet this criteria.
+ field_purge_batch(10);
+ }
+
+}