competition-8.x-1.x-dev/src/Form/CompetitionDeleteForm.php

<?php

namespace Drupal\competition\Form;

use Drupal\Core\Entity\Query\QueryFactory;
use Drupal\Core\Entity\EntityDeleteForm;
use Drupal\Core\Form\FormStateInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Drupal\Core\Url;

/**
 * Builds the form to delete Competition entities.
 */
class CompetitionDeleteForm extends EntityDeleteForm {
  /**
   * The query factory to create entity queries.
   *
   * @var \Drupal\Core\Entity\Query\QueryFactory
   */
  protected $queryFactory;

  /**
   * Constructs a new NodeTypeDeleteConfirm object.
   *
   * @param \Drupal\Core\Entity\Query\QueryFactory $query_factory
   *   The entity query object.
   */
  public function __construct(QueryFactory $query_factory) {
    $this->queryFactory = $query_factory;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static(
      $container->get('entity.query')
    );
  }

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

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

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

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {

    $num_entries = $this->queryFactory->get('competition_entry')
      ->condition('type', $this->entity->id())
      ->count()
      ->execute();

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

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

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

    drupal_set_message(
      $this->t('Deleted @type "@label".',
        [
          '@type' => $this->entity->bundle(),
          '@label' => $this->entity->label(),
        ]
      )
    );

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

}