--- /dev/null
+<?php
+
+namespace Drupal\entity_browser;
+
+use Drupal\Component\Utility\NestedArray;
+use Drupal\Core\Config\ConfigException;
+use Drupal\Core\Plugin\PluginBase;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\entity_browser\Events\Events;
+use Drupal\entity_browser\Events\SelectionDoneEvent;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+
+/**
+ * Base implementation for selection display plugins.
+ */
+abstract class SelectionDisplayBase extends PluginBase implements SelectionDisplayInterface, ContainerFactoryPluginInterface {
+
+ use PluginConfigurationFormTrait;
+
+ /**
+ * Plugin label.
+ *
+ * @var string
+ */
+ protected $label;
+
+ /**
+ * Event dispatcher service.
+ *
+ * @var \Symfony\Component\EventDispatcher\EventDispatcherInterface
+ */
+ protected $eventDispatcher;
+
+ /**
+ * Entity manager service.
+ *
+ * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+ */
+ protected $entityTypeManager;
+
+ /**
+ * Constructs widget plugin.
+ *
+ * @param array $configuration
+ * A configuration array containing information about the plugin instance.
+ * @param string $plugin_id
+ * The plugin_id for the plugin instance.
+ * @param mixed $plugin_definition
+ * The plugin implementation definition.
+ * @param \Symfony\Component\EventDispatcher\EventDispatcherInterface $event_dispatcher
+ * Event dispatcher service.
+ * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+ * The entity manager type service.
+ */
+ public function __construct(array $configuration, $plugin_id, $plugin_definition, EventDispatcherInterface $event_dispatcher, EntityTypeManagerInterface $entity_type_manager) {
+ parent::__construct($configuration, $plugin_id, $plugin_definition);
+ $this->eventDispatcher = $event_dispatcher;
+ $this->entityTypeManager = $entity_type_manager;
+ $this->setConfiguration($configuration);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+ return new static(
+ $configuration,
+ $plugin_id,
+ $plugin_definition,
+ $container->get('event_dispatcher'),
+ $container->get('entity_type.manager')
+ );
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function defaultConfiguration() {
+ return [];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getConfiguration() {
+ return array_diff_key(
+ $this->configuration,
+ ['entity_browser_id' => 0]
+ );
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setConfiguration(array $configuration) {
+ $this->configuration = NestedArray::mergeDeep(
+ $this->defaultConfiguration(),
+ $configuration
+ );
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function calculateDependencies() {
+ return [];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function label() {
+ $this->label;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function validate(array &$form, FormStateInterface $form_state) {}
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submit(array &$form, FormStateInterface $form_state) {}
+
+ /**
+ * {@inheritdoc}
+ */
+ public function checkPreselectionSupport() {
+ if (!$this->getPluginDefinition()['acceptPreselection']) {
+ throw new ConfigException('Used entity browser selection display does not support preselection.');
+ }
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function supportsJsCommands() {
+ return $this->getPluginDefinition()['js_commands'];
+ }
+
+ /**
+ * Marks selection as done - sets value in form state and dispatches event.
+ */
+ protected function selectionDone(FormStateInterface $form_state) {
+ $form_state->set(['entity_browser', 'selection_completed'], TRUE);
+ $this->eventDispatcher->dispatch(
+ Events::DONE,
+ new SelectionDoneEvent(
+ $this->configuration['entity_browser_id'],
+ $form_state->get(['entity_browser', 'instance_uuid'])
+ ));
+ }
+
+}