context-8.x-4.x-dev/modules/context_ui/src/Form/ContextDeleteForm.php

<?php

namespace Drupal\context_ui\Form;

use Drupal\Core\Url;
use Drupal\context\ContextManager;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Entity\EntityConfirmFormBase;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides a form to delete a context.
 */
class ContextDeleteForm extends EntityConfirmFormBase {

  /**
   * The Context module context manager.
   *
   * @var \Drupal\context\ContextManager
   */
  protected $contextManager;

  /**
   * ContextDeleteForm constructor.
   *
   * @param \Drupal\context\ContextManager $contextManager
   *   The Context module context manager.
   */
  public function __construct(ContextManager $contextManager) {
    $this->contextManager = $contextManager;
  }

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

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

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

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

    // Remove the cancel button if this is an AJAX request since Drupals built
    // in modal dialogues does not handle buttons that are not a primary
    // button very well.
    if ($this->getRequest()->isXmlHttpRequest()) {
      unset($form['actions']['cancel']);
    }

    return $form;
  }

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

    $this->messenger()->addMessage($this->t('The context %title has been deleted.', [
      '%title' => $this->entity->getLabel(),
    ]));

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

}