ImageEffectEditForm.php

<?php

namespace Drupal\image\Form;

use Drupal\Core\Form\FormStateInterface;
use Drupal\image\ImageStyleInterface;

/**
 * Provides an edit form for image effects.
 *
 * @internal
 */
class ImageEffectEditForm extends ImageEffectFormBase {

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state, ImageStyleInterface $image_style = NULL, $image_effect = NULL) {
    $form = parent::buildForm($form, $form_state, $image_style, $image_effect);
    $form['#title'] = $this
      ->t('Edit %label effect on style %style', [
      '%label' => $this->imageEffect
        ->label(),
      '%style' => $image_style
        ->label(),
    ]);
    $form['actions']['submit']['#value'] = $this
      ->t('Update effect');
    return $form;
  }

  /**
   * {@inheritdoc}
   */
  protected function prepareImageEffect($image_effect) {
    return $this->imageStyle
      ->getEffect($image_effect);
  }

}