/**
* Form validation handler for widget elements.
*
* @param array $element
* The form element.
* @param array $form_state
* The form state.
*/
public static function validateElement(array $element, FormStateInterface $form_state)
{
parent::validateElement($element, $form_state);
// Massage submitted form values.
// Drupal\Core\Field\WidgetBase::submit() expects values as
// an array of values keyed by delta first, then by column, while our
// widgets return the opposite.
if (is_array($element['#value'])) {
$values = array_values($element['#value']);
} else {
$values = array($element['#value']);
}
// Filter out the 'none' option. Use a strict comparison, because
// 0 == 'any string'.
$index = array_search('_none', $values, TRUE);
if ($index !== FALSE) {
unset($values[$index]);
}
// Transpose selections from field => delta to delta => field.
$items = array();
foreach ($values as $value) {
$items[] = array($element['#key_column'] => $value);
}
NestedArray::setValue($form_state['values'], $element['#parents'], $items);
}
/**
* {@inheritdoc}
*/
public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state)
{
$element = parent::formElement($items, $delta, $element, $form, $form_state);
$options = $this->getOptions($items->getEntity());
$selected = $this->getSelectedOptions($items);
// If required and there is one single option, preselect it.
if ($this->required && count($options) == 1) {
reset($options);
$selected = array(key($options));
}
if ($this->multiple) {
$element += array('#type' => 'checkboxes', '#default_value' => $selected, '#options' => $options);
} else {
$element += array('#type' => 'radios', '#default_value' => $selected ? reset($selected) : NULL, '#options' => $options);
}
return $element;
}
/**
* {@inheritdoc}
*/
public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state)
{
$element = parent::formElement($items, $delta, $element, $form, $form_state);
$element += array('#type' => 'select', '#options' => $this->getOptions($items->getEntity()), '#default_value' => $this->getSelectedOptions($items), '#multiple' => $this->multiple && count($this->options) > 1);
return $element;
}
