component_library-1.0.x-dev/src/Form/VariantDuplicateForm.php

<?php

declare(strict_types=1);

namespace Drupal\component_library\Form;

use Drupal\component_library\Entity\ComponentLibraryVariant;
use Drupal\Core\Entity\EntityForm;
use Drupal\Core\Form\FormStateInterface;
use Drupal\entity\Form\EntityDuplicateFormTrait;

/**
 * Duplicate form.
 *
 * @property \Drupal\component_library\ComponentLibraryVariantInterface $entity
 */
final class VariantDuplicateForm extends EntityForm {

  use EntityDuplicateFormTrait;

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

    $form['label'] = [
      '#type' => 'textfield',
      '#title' => $this->t('Label'),
      '#required' => TRUE,
      '#size' => 32,
      '#maxlength' => 255,
      '#default_value' => $this->t('Duplicate of @label', ['@label' => $this->entity->label()]),
    ];

    $form['id'] = [
      '#type' => 'machine_name',
      '#maxlength' => 31,
      '#machine_name' => [
        'exists' => [self::class, 'exists'],
        'source' => ['label'],
      ],
    ];

    $form['pattern'] = [
      '#type' => 'hidden',
      '#value' => $this->entity->get('pattern'),
    ];

    return $form;
  }

  public static function exists(string $value, array $element, FormStateInterface $form_state): bool {
    return ComponentLibraryVariant::load(ComponentLibraryVariantForm::idFormat($value, $form_state->getValue('pattern'))) !== NULL;
  }

  /**
   * {@inheritdoc}
   */
  protected function actions(array $form, FormStateInterface $form_state): array {
    $actions = [];
    $actions['submit'] = [
      '#type' => 'submit',
      '#value' => $this->t('Duplicate'),
    ];
    return $actions;
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state): void {
    $this->entity->set('label', $form_state->getValue('label'));
    $this->entity->set('id', ComponentLibraryVariantForm::idFormat($form_state->getValue('id'), $form_state->getValue('pattern')));
    $this->entity->save();
    $form_state->setRedirectUrl($this->entity->toUrl('edit-form'));
  }

}