/**
  * {@inheritdoc}
  */
 public function form(array $form, FormStateInterface $form_state)
 {
     $form['label'] = array('#type' => 'textfield', '#title' => $this->t('Image style name'), '#default_value' => $this->entity->label(), '#required' => TRUE);
     $form['name'] = array('#type' => 'machine_name', '#machine_name' => array('exists' => array($this->imageStyleStorage, 'load')), '#default_value' => $this->entity->id(), '#required' => TRUE);
     return parent::form($form, $form_state);
 }
 /**
  * {@inheritdoc}
  */
 public function getQuestion()
 {
     return $this->t('Are you sure you want to delete the @effect effect from the %style style?', array('%style' => $this->imageStyle->label(), '@effect' => $this->imageEffect->label()));
 }