EntityCloneFormInterface.php

<?php

namespace Drupal\entity_clone\EntityClone;

use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Form\FormStateInterface;

/**
 * Defines a common interface for all entity clone form objects.
 */
interface EntityCloneFormInterface {
    
    /**
     * Get all specific form element.
     *
     * @param \Drupal\Core\Entity\EntityInterface $entity
     *   The entity.
     * @param bool $parent
     *   Is the parent form element.
     *
     * @return array
     *   The form elements.
     */
    public function formElement(EntityInterface $entity, $parent = TRUE);
    
    /**
     * Get all new values provided by the specific form element.
     *
     * @param \Drupal\Core\Form\FormStateInterface $form_state
     *   The form state.
     *
     * @return array
     *   An array containing all new values.
     */
    public function getValues(FormStateInterface $form_state);

}