--- /dev/null
+<?php
+
+namespace Drupal\views\Plugin\Derivative;
+
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\State\StateInterface;
+use Drupal\Component\Plugin\Derivative\DeriverBase;
+use Drupal\Core\Plugin\Discovery\ContainerDeriverInterface;
+use Drupal\Core\Routing\RouteProviderInterface;
+use Drupal\views\Views;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides local task definitions for all views configured as local tasks.
+ */
+class ViewsLocalTask extends DeriverBase implements ContainerDeriverInterface {
+
+ /**
+ * The route provider.
+ *
+ * @var \Drupal\Core\Routing\RouteProviderInterface
+ */
+ protected $routeProvider;
+
+ /**
+ * The state key value store.
+ *
+ * @var \Drupal\Core\State\StateInterface
+ */
+ protected $state;
+
+ /**
+ * The view storage.
+ *
+ * @var \Drupal\Core\Entity\EntityStorageInterface
+ */
+ protected $viewStorage;
+
+ /**
+ * Constructs a \Drupal\views\Plugin\Derivative\ViewsLocalTask instance.
+ *
+ * @param \Drupal\Core\Routing\RouteProviderInterface $route_provider
+ * The route provider.
+ * @param \Drupal\Core\State\StateInterface $state
+ * The state key value store.
+ * @param \Drupal\Core\Entity\EntityStorageInterface $view_storage
+ * The view storage.
+ */
+ public function __construct(RouteProviderInterface $route_provider, StateInterface $state, EntityStorageInterface $view_storage) {
+ $this->routeProvider = $route_provider;
+ $this->state = $state;
+ $this->viewStorage = $view_storage;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container, $base_plugin_id) {
+ return new static(
+ $container->get('router.route_provider'),
+ $container->get('state'),
+ $container->get('entity.manager')->getStorage('view')
+ );
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getDerivativeDefinitions($base_plugin_definition) {
+ $this->derivatives = [];
+
+ $view_route_names = $this->state->get('views.view_route_names');
+ foreach ($this->getApplicableMenuViews() as $pair) {
+ /** @var $executable \Drupal\views\ViewExecutable */
+ list($view_id, $display_id) = $pair;
+ $executable = $this->viewStorage->load($view_id)->getExecutable();
+
+ $executable->setDisplay($display_id);
+ $menu = $executable->display_handler->getOption('menu');
+ if (in_array($menu['type'], ['tab', 'default tab'])) {
+ $plugin_id = 'view.' . $executable->storage->id() . '.' . $display_id;
+ $route_name = $view_route_names[$executable->storage->id() . '.' . $display_id];
+
+ // Don't add a local task for views which override existing routes.
+ // @todo Alternative it could just change the existing entry.
+ if ($route_name != $plugin_id) {
+ continue;
+ }
+
+ $this->derivatives[$plugin_id] = [
+ 'route_name' => $route_name,
+ 'weight' => $menu['weight'],
+ 'title' => $menu['title'],
+ ] + $base_plugin_definition;
+
+ // Default local tasks have themselves as root tab.
+ if ($menu['type'] == 'default tab') {
+ $this->derivatives[$plugin_id]['base_route'] = $route_name;
+ }
+ }
+ }
+ return $this->derivatives;
+ }
+
+ /**
+ * Alters base_route and parent_id into the views local tasks.
+ */
+ public function alterLocalTasks(&$local_tasks) {
+ $view_route_names = $this->state->get('views.view_route_names');
+
+ foreach ($this->getApplicableMenuViews() as $pair) {
+ list($view_id, $display_id) = $pair;
+ /** @var $executable \Drupal\views\ViewExecutable */
+ $executable = $this->viewStorage->load($view_id)->getExecutable();
+
+ $executable->setDisplay($display_id);
+ $menu = $executable->display_handler->getOption('menu');
+
+ // We already have set the base_route for default tabs.
+ if (in_array($menu['type'], ['tab'])) {
+ $plugin_id = 'view.' . $executable->storage->id() . '.' . $display_id;
+ $view_route_name = $view_route_names[$executable->storage->id() . '.' . $display_id];
+
+ // Don't add a local task for views which override existing routes.
+ if ($view_route_name != $plugin_id) {
+ unset($local_tasks[$plugin_id]);
+ continue;
+ }
+
+ // Find out the parent route.
+ // @todo Find out how to find both the root and parent tab.
+ $path = $executable->display_handler->getPath();
+ $split = explode('/', $path);
+ array_pop($split);
+ $path = implode('/', $split);
+
+ $pattern = '/' . str_replace('%', '{}', $path);
+ if ($routes = $this->routeProvider->getRoutesByPattern($pattern)) {
+ foreach ($routes->all() as $name => $route) {
+ $local_tasks['views_view:' . $plugin_id]['base_route'] = $name;
+ // Skip after the first found route.
+ break;
+ }
+ }
+ }
+ }
+ }
+
+ /**
+ * Return a list of all views and display IDs that have a menu entry.
+ *
+ * @return array
+ * A list of arrays containing the $view and $display_id.
+ * @code
+ * array(
+ * array($view, $display_id),
+ * array($view, $display_id),
+ * );
+ * @endcode
+ */
+ protected function getApplicableMenuViews() {
+ return Views::getApplicableViews('uses_menu_links');
+ }
+
+}