/**
* {@inheritdoc}
*/
public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state)
{
$element = parent::formElement($items, $delta, $element, $form, $form_state);
// Prepare some properties for the child methods to build the actual form element.
$this->required = $element['#required'];
$multiple = $this->fieldDefinition->getFieldStorageDefinition()->isMultiple();
$this->has_value = isset($items[0]->{$this->column});
$options = [];
$item = $items->get($delta);
if (!empty($item)) {
$options = $this->getOptions($item);
$selected = $this->getSelectedOptions($items);
}
$element += array('#type' => 'multiselect', '#size' => $this->getSetting('size'), '#options' => $options, '#multiple' => $multiple, '#key_column' => $this->column, '#default_value' => $selected);
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);
$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;
}
