mailjet-8.x-2.7/modules/mailjet_subscription/src/Form/SubscriptionFormDeleteForm.php

<?php

namespace Drupal\mailjet_subscription\Form;

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

/**
 *
 * @ingroup mailjet_subscription
 */
class SubscriptionFormDeleteForm extends EntityConfirmFormBase
{

    public function getQuestion()
    {
        return $this->t('Are you sure you want to delete the subscription form -> %label?', [
        '%label' => $this->entity->label(),
        ]);
    }

    public function getConfirmText()
    {
        return $this->t('Delete Subscription Form');
    }

    public function getCancelUrl()
    {
        return new Url('entity.mailjet_subscription_form.list');
    }

    public function submitForm(array &$form, FormStateInterface $form_state)
    {

        $block_name = strtolower('mailjetsubscriptionform' . $this->entity->name);
        $block_name = str_replace(' ', '', $block_name);
        $block = Block::load($block_name);

        if (!empty($block)) {
            $block->delete();
        }

      // Delete the entity.
        $this->entity->delete();

      // Set a message that the entity was deleted.
        \Drupal::messenger()->addMessage($this->t('Subscription Form %label was deleted.', [
        '%label' => $this->entity->label(),
        ]));

      // Redirect the user to the list controller when complete.
        $form_state->setRedirectUrl($this->getCancelUrl());
    }

}