/**
* {@inheritdoc}
*/
public function preprocessElement(Element $element, Variables $variables)
{
$variables->addClass(['image-widget', 'js-form-managed-file', 'form-managed-file', 'clearfix']);
$data =& $variables->offsetGet('data', []);
foreach ($element->children() as $key => $child) {
// Modify the label to be a placeholder instead.
if ($key === 'alt') {
$child->setProperty('form_group', FALSE);
$placeholder = (string) $child->getAttribute('placeholder');
if (!$placeholder) {
$label = ['#theme' => 'form_element_label'];
$label += array_intersect_key($child->getArray(), array_flip(['#id', '#required', '#title', '#title_display']));
$child->setProperty('title_display', 'invisible');
$placeholder = trim(strip_tags(Element::create($label)->render()));
if ($child->getProperty('required')) {
$child->setProperty('description', t('@description (Required)', ['@description' => $child->getProperty('description')]));
}
}
if ($placeholder) {
$child->setAttribute('placeholder', $placeholder);
}
}
$data[$key] = $child->getArray();
}
}
/**
* {@inheritdoc}
*/
public static function processElement(Element $element, FormStateInterface $form_state, array &$complete_form)
{
foreach ($element->children() as $child) {
if ($child->isPropertyEmpty('icon')) {
$child->setIcon();
}
}
}
/**
* {@inheritdoc}
*/
public static function processElement(Element $element, FormStateInterface $form_state, array &$complete_form)
{
$dropbuttons = Element::create();
foreach ($element->children(TRUE) as $key => $child) {
if ($dropbutton = $child->getProperty('dropbutton')) {
// If there is no dropbutton for this button group yet, create one.
if (!isset($dropbuttons->{$dropbutton})) {
$dropbuttons->{$dropbutton} = ['#type' => 'dropbutton'];
}
$dropbuttons[$dropbutton]['#links'][$key] = $child->getArray();
// Remove original child from the element so it's not rendered twice.
$child->setProperty('printed', TRUE);
}
}
$element->exchangeArray($dropbuttons->getArray() + $element->getArray());
}
/**
* Traverses an element to find the closest button.
*
* @param \Drupal\bootstrap\Utility\Element $element
* The element to iterate over.
*
* @return \Drupal\bootstrap\Utility\Element|FALSE
* The first button element or FALSE if no button could be found.
*/
protected static function &findButton(Element $element)
{
$button = FALSE;
foreach ($element->children() as $child) {
if ($child->isButton()) {
$button = $child;
}
if ($result =& self::findButton($child)) {
$button = $result;
}
}
return $button;
}
