--- /dev/null
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\linkit\Element\Linkit.
+ */
+
+namespace Drupal\linkit\Element;
+
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Render\BubbleableMetadata;
+use Drupal\Core\Render\Element;
+use Drupal\Core\Render\Element\FormElement;
+use Drupal\Core\Render\Element\Textfield;
+use Drupal\Core\Url;
+
+/**
+ * Provides a form element for linkit.
+ *
+ * @FormElement("linkit")
+ */
+class Linkit extends FormElement {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getInfo() {
+ $class = get_class($this);
+ return array(
+ '#input' => TRUE,
+ '#size' => 60,
+ '#process' => array(
+ array($class, 'processLinkitAutocomplete'),
+ array($class, 'processGroup'),
+ ),
+ '#pre_render' => array(
+ array($class, 'preRenderLinkitElement'),
+ array($class, 'preRenderGroup'),
+ ),
+ '#theme' => 'input__textfield',
+ '#theme_wrappers' => array('form_element'),
+ );
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function valueCallback(&$element, $input, FormStateInterface $form_state) {
+ return Textfield::valueCallback($element, $input, $form_state);
+ }
+
+ /**
+ * Adds linkit custom autocomplete functionality to elements.
+ *
+ * Instead of using the core autocomplete, we use our own.
+ *
+ * {@inheritdoc}
+ *
+ * @see \Drupal\Core\Render\Element\FormElement::processAutocomplete
+ */
+ public static function processLinkitAutocomplete(&$element, FormStateInterface $form_state, &$complete_form) {
+ $url = NULL;
+ $access = FALSE;
+
+ if (!empty($element['#autocomplete_route_name'])) {
+ $parameters = isset($element['#autocomplete_route_parameters']) ? $element['#autocomplete_route_parameters'] : array();
+ $url = Url::fromRoute($element['#autocomplete_route_name'], $parameters)->toString(TRUE);
+ /** @var \Drupal\Core\Access\AccessManagerInterface $access_manager */
+ $access_manager = \Drupal::service('access_manager');
+ $access = $access_manager->checkNamedRoute($element['#autocomplete_route_name'], $parameters, \Drupal::currentUser(), TRUE);
+ }
+
+ if ($access) {
+ $metadata = BubbleableMetadata::createFromRenderArray($element);
+ if ($access->isAllowed()) {
+ $element['#attributes']['class'][] = 'form-linkit-autocomplete';
+ $metadata->addAttachments(['library' => ['linkit/linkit.autocomplete']]);
+ // Provide a data attribute for the JavaScript behavior to bind to.
+ $element['#attributes']['data-autocomplete-path'] = $url->getGeneratedUrl();
+ $metadata = $metadata->merge($url);
+ }
+ $metadata
+ ->merge(BubbleableMetadata::createFromObject($access))
+ ->applyTo($element);
+ }
+
+ return $element;
+ }
+
+ /**
+ * Prepares a #type 'linkit' render element for input.html.twig.
+ *
+ * @param array $element
+ * An associative array containing the properties of the element.
+ * Properties used: #title, #value, #description, #size, #attributes.
+ *
+ * @return array
+ * The $element with prepared variables ready for input.html.twig.
+ */
+ public static function preRenderLinkitElement($element) {
+ $element['#attributes']['type'] = 'text';
+ Element::setAttributes($element, array('id', 'name', 'value', 'size'));
+ static::setAttributes($element, array('form-text'));
+
+ return $element;
+ }
+
+}