collection-8.x-1.x-dev/src/Form/CollectionTypeDeleteForm.php

<?php

namespace Drupal\collection\Form;

use Drupal\Core\Entity\EntityConfirmFormBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Url;

/**
 * Builds the form to delete Collection type entities.
 */
class CollectionTypeDeleteForm extends EntityConfirmFormBase {

  /**
   * {@inheritdoc}
   */
  public function getQuestion() {
    return $this->t('Are you sure you want to delete %name?', ['%name' => $this->entity->label()]);
  }

  /**
   * {@inheritdoc}
   */
  public function getCancelUrl() {
    return new Url('entity.collection_type.collection');
  }

  /**
   * {@inheritdoc}
   */
  public function getConfirmText() {
    return $this->t('Delete');
  }

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {
    $collection_count = $this->entityTypeManager->getStorage('collection')->getQuery()
      ->accessCheck(FALSE)
      ->condition('type', $this->entity->id())
      ->count()
      ->execute();

    if ($collection_count) {
      $caption = '<p>' . $this->formatPlural($collection_count, '%type is used by 1 collection on your site. You can not remove this collection type until you have removed all of the %type collections.', '%type is used by @count collections on your site. You may not remove %type until you have removed all of the %type collections.', ['%type' => $this->entity->label()]) . '</p>';
      $form['#title'] = $this->getQuestion();
      $form['description'] = ['#markup' => $caption];
      return $form;
    }

    return parent::buildForm($form, $form_state);
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    $this->entity->delete();

    $this->messenger()->addMessage(
      $this->t('content @type: deleted @label.', [
        '@type' => $this->entity->bundle(),
        '@label' => $this->entity->label(),
      ])
    );

    $form_state->setRedirectUrl($this->getCancelUrl());
  }

}