--- /dev/null
+<?php
+
+namespace Drupal\contextual\Element;
+
+use Drupal\Component\Utility\Html;
+use Drupal\Core\Render\Element\RenderElement;
+use Drupal\Core\Url;
+
+/**
+ * Provides a contextual_links element.
+ *
+ * @RenderElement("contextual_links")
+ */
+class ContextualLinks extends RenderElement {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getInfo() {
+ $class = get_class($this);
+ return [
+ '#pre_render' => [
+ [$class, 'preRenderLinks'],
+ ],
+ '#theme' => 'links__contextual',
+ '#links' => [],
+ '#attributes' => ['class' => ['contextual-links']],
+ '#attached' => [
+ 'library' => [
+ 'contextual/drupal.contextual-links',
+ ],
+ ],
+ ];
+ }
+
+ /**
+ * Pre-render callback: Builds a renderable array for contextual links.
+ *
+ * @param array $element
+ * A renderable array containing a #contextual_links property, which is a
+ * keyed array. Each key is the name of the group of contextual links to
+ * render (based on the 'group' key in the *.links.contextual.yml files for
+ * all enabled modules). The value contains an associative array containing
+ * the following keys:
+ * - route_parameters: The route parameters passed to the url generator.
+ * - metadata: Any additional data needed in order to alter the link.
+ * @code
+ * array('#contextual_links' => array(
+ * 'block' => array(
+ * 'route_parameters' => array('block' => 'system.menu-tools'),
+ * ),
+ * 'menu' => array(
+ * 'route_parameters' => array('menu' => 'tools'),
+ * ),
+ * ))
+ * @endcode
+ *
+ * @return array
+ * A renderable array representing contextual links.
+ */
+ public static function preRenderLinks(array $element) {
+ // Retrieve contextual menu links.
+ $items = [];
+
+ $contextual_links_manager = static::contextualLinkManager();
+
+ foreach ($element['#contextual_links'] as $group => $args) {
+ $args += [
+ 'route_parameters' => [],
+ 'metadata' => [],
+ ];
+ $items += $contextual_links_manager->getContextualLinksArrayByGroup($group, $args['route_parameters'], $args['metadata']);
+ }
+
+ // Transform contextual links into parameters suitable for links.html.twig.
+ $links = [];
+ foreach ($items as $class => $item) {
+ $class = Html::getClass($class);
+ $links[$class] = [
+ 'title' => $item['title'],
+ 'url' => Url::fromRoute(isset($item['route_name']) ? $item['route_name'] : '', isset($item['route_parameters']) ? $item['route_parameters'] : []),
+ ];
+ }
+ $element['#links'] = $links;
+
+ // Allow modules to alter the renderable contextual links element.
+ static::moduleHandler()->alter('contextual_links_view', $element, $items);
+
+ // If there are no links, tell drupal_render() to abort rendering.
+ if (empty($element['#links'])) {
+ $element['#printed'] = TRUE;
+ }
+
+ return $element;
+ }
+
+ /**
+ * Wraps the contextual link manager.
+ *
+ * @return \Drupal\Core\Menu\ContextualLinkManager
+ */
+ protected static function contextualLinkManager() {
+ return \Drupal::service('plugin.manager.menu.contextual_link');
+ }
+
+ /**
+ * Wraps the module handler.
+ *
+ * @return \Drupal\Core\Extension\ModuleHandlerInterface
+ */
+ protected static function moduleHandler() {
+ return \Drupal::moduleHandler();
+ }
+
+}