--- /dev/null
+<?php
+
+namespace Drupal\paragraphs;
+
+use Drupal\Component\Plugin\PluginBase;
+use Drupal\Core\Entity\EntityFieldManager;
+use Drupal\Core\Field\FieldConfigInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Drupal\paragraphs\Entity\Paragraph;
+use Drupal\paragraphs\Entity\ParagraphsType;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+abstract class ParagraphsBehaviorBase extends PluginBase implements ParagraphsBehaviorInterface, ContainerFactoryPluginInterface {
+
+ use StringTranslationTrait;
+
+ /**
+ * The entity field manager.
+ *
+ * @var \Drupal\Core\Entity\EntityFieldManagerInterface
+ */
+ protected $entityFieldManager;
+
+ /**
+ * Constructs a ParagraphsBehaviorBase object.
+ *
+ * @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 \Drupal\Core\Entity\EntityFieldManager $entity_field_manager
+ * The entity field manager.
+ */
+ public function __construct(array $configuration, $plugin_id, $plugin_definition, EntityFieldManager $entity_field_manager) {
+ parent::__construct($configuration, $plugin_id, $plugin_definition);
+ $this->configuration += $this->defaultConfiguration();
+ $this->entityFieldManager = $entity_field_manager;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+ return new static($configuration, $plugin_id, $plugin_definition,
+ $container->get('entity_field.manager')
+ );
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
+ return $form;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function validateConfigurationForm(array &$form, FormStateInterface $form_state) { }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitConfigurationForm(array &$form, FormStateInterface $form_state) { }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function defaultConfiguration() {
+ return [];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getConfiguration() {
+ return $this->configuration;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function setConfiguration(array $configuration) {
+ $this->configuration = $configuration + $this->defaultConfiguration();
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function calculateDependencies() {
+ return [];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function preprocess(&$variables) { }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function isApplicable(ParagraphsType $paragraphs_type) {
+ return TRUE;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function settingsSummary(Paragraph $paragraph) {
+ return [];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function buildBehaviorForm(ParagraphInterface $paragraph, array &$form, FormStateInterface $form_state) {
+ return [];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function validateBehaviorForm(ParagraphInterface $paragraph, array &$form, FormStateInterface $form_state) {}
+
+ /**
+ * {@inheritdoc}
+ */
+ public function submitBehaviorForm(ParagraphInterface $paragraph, array &$form, FormStateInterface $form_state) {
+ $paragraph->setBehaviorSettings($this->getPluginId(), $form_state->getValues());
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getFieldNameOptions(ParagraphsType $paragraphs_type, $field_type = NULL) {
+ $fields = [];
+ $field_definitions = $this->entityFieldManager->getFieldDefinitions('paragraph', $paragraphs_type->id());
+ foreach ($field_definitions as $name => $definition) {
+ if ($field_definitions[$name] instanceof FieldConfigInterface) {
+ if (empty($field_type) || $definition->getType() == $field_type) {
+ $fields[$name] = $definition->getLabel();
+ }
+ }
+ }
+ return $fields;
+ }
+
+}