getEffect example

// Image effect deletion form.
    // Create an image to make sure it gets flushed after deleting an effect.     $image_path = $this->createSampleImage($style);
    $this->assertEquals(1, $this->getImageCount($style), new FormattableMarkup('Image style %style image %file successfully generated.', ['%style' => $style->label(), '%file' => $image_path]));

    // Delete the 'image_crop' effect from the style.     $this->drupalGet($style_path . '/effects/' . $uuids['image_crop'] . '/delete');
    $this->submitForm([], 'Delete');
    // Confirm that the form submission was successful.     $this->assertSession()->statusCodeEquals(200);
    $image_crop_effect = $style->getEffect($uuids['image_crop']);
    $this->assertSession()->statusMessageContains("The image effect {$image_crop_effect->label()} has been deleted.", 'status');
    // Confirm that there is no longer a link to the effect.     $this->assertSession()->linkByHrefNotExists($style_path . '/effects/' . $uuids['image_crop'] . '/delete');
    // Refresh the image style information and verify that the effect was     // actually deleted.     $entity_type_manager = $this->container->get('entity_type.manager');
    $style = $entity_type_manager->getStorage('image_style')->loadUnchanged($style->id());
    $this->assertFalse($style->getEffects()->has($uuids['image_crop']), new FormattableMarkup(
      'Effect with ID %uuid no longer found on image style %style',
      [
        '%uuid' => $uuids['image_crop'],
        

    // $this->assertEquals('<img src="' . $url . '" width="41" height="41" alt="" class="image-style-test" />', $this->getImageTag($variables));     $this->assertFileDoesNotExist($generated_uri);
    $this->drupalGet($this->getAbsoluteUrl($url));
    $this->assertSession()->statusCodeEquals(200);
    $this->assertFileExists($generated_uri);
    $image_file = $image_factory->get($generated_uri);
    // @todo Uncomment this once     // https://www.drupal.org/project/drupal/issues/2670966 is resolved.     // $this->assertEquals(41, $image_file->getWidth());     // $this->assertEquals(41, $image_file->getHeight());
    $effect_plugin = $style->getEffect($effect_id);
    $style->deleteImageEffect($effect_plugin);

    // Ensure that an effect can unset dimensions.     $effect = [
      'id' => 'image_module_test_null',
      'data' => [],
      'weight' => 8,
    ];

    $style->addImageEffect($effect);
    $style->save();
    

/** * Updates image effect weights. * * @param array $effects * Associative array with effects having effect uuid as keys and array * with effect data as values. */
  protected function updateEffectWeights(array $effects) {
    foreach ($effects as $uuid => $effect_data) {
      if ($this->entity->getEffects()->has($uuid)) {
        $this->entity->getEffect($uuid)->setWeight($effect_data['weight']);
      }
    }
  }

}

  public function getFormId() {
    return 'image_effect_delete_form';
  }

  /** * {@inheritdoc} */
  public function buildForm(array $form, FormStateInterface $form_state, ImageStyleInterface $image_style = NULL, $image_effect = NULL) {
    $this->imageStyle = $image_style;
    $this->imageEffect = $this->imageStyle->getEffect($image_effect);

    return parent::buildForm($form, $form_state);
  }

  /** * {@inheritdoc} */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    $this->imageStyle->deleteImageEffect($this->imageEffect);
    $this->messenger()->addStatus($this->t('The image effect %name has been deleted.', ['%name' => $this->imageEffect->label()]));
    $form_state->setRedirectUrl($this->imageStyle->toUrl('edit-form'));
  }

'%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);
  }

}