--- /dev/null
+<?php
+
+namespace Drupal\workspaces\Plugin\Block;
+
+use Drupal\Core\Block\BlockBase;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\Core\Form\FormBuilderInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\workspaces\Form\WorkspaceSwitcherForm;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a 'Workspace switcher' block.
+ *
+ * @Block(
+ * id = "workspace_switcher",
+ * admin_label = @Translation("Workspace switcher"),
+ * category = @Translation("Workspace"),
+ * )
+ */
+class WorkspaceSwitcherBlock extends BlockBase implements ContainerFactoryPluginInterface {
+
+ /**
+ * The form builder.
+ *
+ * @var \Drupal\Core\Form\FormBuilderInterface
+ */
+ protected $formBuilder;
+
+ /**
+ * The entity type manager.
+ *
+ * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+ */
+ protected $entityTypeManager;
+
+ /**
+ * Constructs a new WorkspaceSwitcherBlock instance.
+ *
+ * @param array $configuration
+ * The plugin configuration.
+ * @param string $plugin_id
+ * The plugin ID.
+ * @param mixed $plugin_definition
+ * The plugin definition.
+ * @param \Drupal\Core\Form\FormBuilderInterface $form_builder
+ * The form builder.
+ * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+ * The entity type manager.
+ */
+ public function __construct(array $configuration, $plugin_id, $plugin_definition, FormBuilderInterface $form_builder, EntityTypeManagerInterface $entity_type_manager) {
+ parent::__construct($configuration, $plugin_id, $plugin_definition);
+ $this->formBuilder = $form_builder;
+ $this->entityTypeManager = $entity_type_manager;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+ return new static(
+ $configuration,
+ $plugin_id,
+ $plugin_definition,
+ $container->get('form_builder'),
+ $container->get('entity_type.manager')
+ );
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function build() {
+ $build = [
+ 'form' => $this->formBuilder->getForm(WorkspaceSwitcherForm::class),
+ '#cache' => [
+ 'contexts' => $this->entityTypeManager->getDefinition('workspace')->getListCacheContexts(),
+ 'tags' => $this->entityTypeManager->getDefinition('workspace')->getListCacheTags(),
+ ],
+ ];
+ return $build;
+ }
+
+}