/**
* {@inheritdoc}
*/
protected function formMultipleElements(FieldItemListInterface $items, array &$form, FormStateInterface $form_state)
{
$elements = parent::formMultipleElements($items, $form, $form_state);
// Alter #upload_validators passed to #file_upload_description.
$this->alterFileUploadHelpParameters($elements['#file_upload_description']);
// TODO: Why do we need this?
if ($this->isDefaultValueWidget($form_state) && !empty($elements[1])) {
unset($elements[1]);
$elements['#file_upload_delta'] = 0;
}
return $elements;
}
/**
* Overrides \Drupal\file\Plugin\Field\FieldWidget\FileWidget::formMultipleElements().
*
* Special handling for draggable multiple widgets and 'add more' button.
*/
protected function formMultipleElements(FieldItemListInterface $items, array &$form, FormStateInterface $form_state)
{
$elements = parent::formMultipleElements($items, $form, $form_state);
$cardinality = $this->fieldDefinition->getFieldStorageDefinition()->getCardinality();
$file_upload_help = array('#theme' => 'file_upload_help', '#description' => '', '#upload_validators' => $elements[0]['#upload_validators'], '#cardinality' => $cardinality);
if ($cardinality == 1) {
// If there's only one field, return it as delta 0.
if (empty($elements[0]['#default_value']['fids'])) {
$file_upload_help['#description'] = field_filter_xss($this->fieldDefinition->getDescription());
$elements[0]['#description'] = drupal_render($file_upload_help);
}
} else {
$elements['#file_upload_description'] = $file_upload_help;
}
return $elements;
}
