class ShortcutSetDeleteForm

class ShortcutSetDeleteForm extends EntityDeleteForm {
    
    /**
     * The database connection.
     *
     * @var \Drupal\Core\Database\Connection
     */
    protected $database;
    
    /**
     * The shortcut storage.
     *
     * @var \Drupal\shortcut\ShortcutSetStorageInterface
     */
    protected $storage;
    
    /**
     * Constructs a ShortcutSetDeleteForm object.
     */
    public function __construct(Connection $database, ShortcutSetStorageInterface $storage) {
        $this->database = $database;
        $this->storage = $storage;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('database'), $container->get('entity_type.manager')
            ->getStorage('shortcut_set'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state) {
        // Find out how many users are directly assigned to this shortcut set, and
        // make a message.
        $number = $this->storage
            ->countAssignedUsers($this->entity);
        $info = '';
        if ($number) {
            $info .= '<p>' . $this->formatPlural($number, '1 user has chosen or been assigned to this shortcut set.', '@count users have chosen or been assigned to this shortcut set.') . '</p>';
        }
        // Also, if a module implements hook_shortcut_default_set(), it's possible
        // that this set is being used as a default set. Add a message about that too.
        if ($this->moduleHandler
            ->getImplementations('shortcut_default_set')) {
            $info .= '<p>' . t('If you have chosen this shortcut set as the default for some or all users, they may also be affected by deleting it.') . '</p>';
        }
        $form['info'] = [
            '#markup' => $info,
        ];
        return parent::buildForm($form, $form_state);
    }

}