EditForm::buildForm

public EditForm::buildForm(array $form, FormStateInterface $form_state, $pid = NULL)

public function buildForm(array $form, FormStateInterface $form_state, $pid = NULL) {
  $form = parent::buildForm($form, $form_state, $pid);

  $form['#title'] = $this->path['alias'];
  $form['pid'] = array(
    '#type' => 'hidden',
    '#value' => $this->path['pid'],
  );

  $url = new Url('path.delete', array(
    'pid' => $this->path['pid'],
  ));

  if ($this->getRequest()->query->has('destination')) {
    $url->setOption('query', $this->getDestinationArray());
  }

  $form['actions']['delete'] = array(
    '#type' => 'link',
    '#title' => $this->t('Delete'),
    '#url' => $url,
    '#attributes' => array(
      'class' => array('button', 'button--danger'),
    ),
  );

  return $form;
}