bibcite-8.x-1.x-dev/src/Form/CslStyleDeleteForm.php

<?php

namespace Drupal\bibcite\Form;

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

/**
 * Builds the form to delete CSL style entities.
 */
class CslStyleDeleteForm 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.bibcite_csl_style.collection');
  }

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

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

    $config = $this->config('bibcite.settings');
    if ($config->get('default_style') == $this->entity->id()) {
      $form_state->setError($form, $this->t('You can not delete default style.'));
    }
  }

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

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

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

}