--- /dev/null
+<?php
+
+namespace Drupal\views\Plugin\Derivative;
+
+use Drupal\Core\Plugin\Discovery\ContainerDeriverInterface;
+use Drupal\Core\Entity\EntityStorageInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides block plugin definitions for all Views exposed filters.
+ *
+ * @see \Drupal\views\Plugin\Block\ViewsExposedFilterBlock
+ */
+class ViewsExposedFilterBlock implements ContainerDeriverInterface {
+
+ /**
+ * List of derivative definitions.
+ *
+ * @var array
+ */
+ protected $derivatives = [];
+
+ /**
+ * The view storage.
+ *
+ * @var \Drupal\Core\Entity\EntityStorageInterface
+ */
+ protected $viewStorage;
+
+ /**
+ * The base plugin ID that the derivative is for.
+ *
+ * @var string
+ */
+ protected $basePluginId;
+
+ /**
+ * Constructs a ViewsExposedFilterBlock object.
+ *
+ * @param string $base_plugin_id
+ * The base plugin ID.
+ * @param \Drupal\Core\Entity\EntityStorageInterface $view_storage
+ * The entity storage to load views.
+ */
+ public function __construct($base_plugin_id, EntityStorageInterface $view_storage) {
+ $this->basePluginId = $base_plugin_id;
+ $this->viewStorage = $view_storage;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container, $base_plugin_id) {
+ return new static(
+ $base_plugin_id,
+ $container->get('entity.manager')->getStorage('view')
+ );
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getDerivativeDefinition($derivative_id, $base_plugin_definition) {
+ if (!empty($this->derivatives) && !empty($this->derivatives[$derivative_id])) {
+ return $this->derivatives[$derivative_id];
+ }
+ $this->getDerivativeDefinitions($base_plugin_definition);
+ return $this->derivatives[$derivative_id];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getDerivativeDefinitions($base_plugin_definition) {
+ // Check all Views for displays with an exposed filter block.
+ foreach ($this->viewStorage->loadMultiple() as $view) {
+ // Do not return results for disabled views.
+ if (!$view->status()) {
+ continue;
+ }
+ $executable = $view->getExecutable();
+ $executable->initDisplay();
+ foreach ($executable->displayHandlers as $display) {
+ if (isset($display) && $display->getOption('exposed_block')) {
+ // Add a block definition for the block.
+ if ($display->usesExposedFormInBlock()) {
+ $delta = $view->id() . '-' . $display->display['id'];
+ $desc = t('Exposed form: @view-@display_id', ['@view' => $view->id(), '@display_id' => $display->display['id']]);
+ $this->derivatives[$delta] = [
+ 'admin_label' => $desc,
+ 'config_dependencies' => [
+ 'config' => [
+ $view->getConfigDependencyName(),
+ ]
+ ]
+ ];
+ $this->derivatives[$delta] += $base_plugin_definition;
+ }
+ }
+ }
+ }
+ return $this->derivatives;
+ }
+
+}