Issue #3421857 - Add default values

entity_body_class.module

@@ -36,6 +36,7 @@ function entity_body_class_entity_base_field_info(EntityTypeInterface $entity_ty
   if (in_array('Drupal\Core\Entity\ContentEntityInterface', class_implements($entity_type->getOriginalClass())) &&
     $entity_type->getLinkTemplate('canonical')
   ) {
+    \Drupal::logger('module')->notice($entity_type->id());
     $fields['entity_body_class'] = BaseFieldDefinition::create('string')
       ->setLabel(t('Body CSS class(es)'))
       ->setDescription(t('e.g. <em>my-body-class-1 my-body-class-2</em>'))
@@ -59,6 +60,15 @@ function entity_body_class_form_alter(&$form, FormStateInterface $form_state, $f
   if ($object instanceof ContentEntityFormInterface &&
     array_key_exists('entity_body_class', $form)
   ) {
+    $config = \Drupal::configFactory()->getEditable('entity_body_class.fields');
+    $entity = $object->getEntity();
+
+    $types = $config->get('types');
+    if ($types && $entity->isNew() && !empty($types[$entity->getEntityTypeId()])) {
+      $widget = &$form['entity_body_class']['widget'];
+      $widget[0]['value']['#default_value'] = $types[$entity->getEntityTypeId()];
+    }
+
     $form['entity_body_class']['#access'] = \Drupal::currentUser()->hasPermission('access entity body class fields');
     $form['#validate'][] = 'entity_body_class_entity_form_validate';
   }

entity_body_class.permissions.yml

+access entity body class settings:
+  title: 'Manage body class settings'
+  description: 'Allows a user to manage body class settings.'
 access entity body class fields:
   title: 'Manage body class fields'
   description: 'Allows a user to manage body class fields.'

entity_body_class.routing.yml

+entity_body_class.settings:
+  path: '/admin/config/content/body-class-settings'
+  defaults:
+    _form: '\Drupal\entity_body_class\Form\EntityBodyClassForm'
+    _title: 'Manage entity body class settings'
+  requirements:
+    _permission: 'access entity body class settings'

src/Form/EntityBodyClassForm.php

+<?php
+
+namespace Drupal\entity_body_class\Form;
+
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\Core\Form\ConfigFormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Form handler for adding body class settings.
+ */
+class EntityBodyClassForm extends ConfigFormBase {
+
+  /**
+   * Returns the entity_type.manager service.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+   */
+  protected $entityTypeManager;
+
+  /**
+   * Constructs a EntityBodyClassForm form.
+   *
+   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
+   *   The factory for configuration objects.
+   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+   *   Provides an interface for entity type managers.
+   */
+  public function __construct(ConfigFactoryInterface $config_factory, EntityTypeManagerInterface $entity_type_manager) {
+    parent::__construct($config_factory);
+
+    $this->entityTypeManager = $entity_type_manager;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('config.factory'),
+      $container->get('entity_type.manager')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'entity_body_class';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getEditableConfigNames() {
+    return [
+      'entity_body_class.fields',
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    $config = $this->configFactory->getEditable('entity_body_class.fields');
+
+    $form['types'] = [
+      '#type' => 'fieldset',
+      '#title' => $this->t('Default body classes'),
+      '#tree' => TRUE,
+    ];
+
+    foreach ($this->entityTypeManager->getDefinitions() as $definition) {
+      if (in_array('Drupal\Core\Entity\ContentEntityInterface', class_implements($definition->getOriginalClass())) &&
+        $definition->getLinkTemplate('canonical')
+      ) {
+        $id = $definition->id();
+        $form['types'][$id] = [
+          '#type' => 'textfield',
+          '#title' => $definition->getLabel()->render(),
+          '#default_value' => isset($config->get('types')[$id]) ? $config->get('types')[$id] : '',
+        ];
+      }
+    }
+
+    return parent::buildForm($form, $form_state);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    $this->configFactory->getEditable('entity_body_class.fields')
+      ->set('types', array_filter($form_state->getValue('types')))
+      ->save();
+
+    parent::submitForm($form, $form_state);
+  }
+
+}