implements entity extra fields source, fixes nuvoleweb#108

Author: yannickoo

src/Plugin/UiPatterns/Source/ExtraFieldSource.php

@@ -0,0 +1,80 @@
+<?php
+
+namespace Drupal\ui_patterns\Plugin\UiPatterns\Source;
+
+use Drupal\Core\Entity\EntityFieldManager;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\ui_patterns\Plugin\PatternSourceBase;
+use Drupal\ui_patterns\UiPatternsManager;
+use Drupal\Core\TypedData\TypedDataManager;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Defines Fields API pattern source plugin.
+ *
+ * @UiPatternsSource(
+ *   id = "extra_fields",
+ *   label = @Translation("Extra fields"),
+ *   provider = "field",
+ *   tags = {
+ *     "entity_display"
+ *   }
+ * )
+ */
+class ExtraFieldSource extends PatternSourceBase implements ContainerFactoryPluginInterface {
+
+  /**
+   * Entity field manager service.
+   *
+   * @var \Drupal\Core\Entity\EntityFieldManager
+   */
+  protected $entityFieldManager;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, UiPatternsManager $ui_patterns_manager, TypedDataManager $typed_data_manager, EntityFieldManager $entity_field_manager) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+    $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('plugin.manager.ui_patterns'),
+      $container->get('typed_data_manager'),
+      $container->get('entity_field.manager')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getSourceFields() {
+    $sources = [];
+    $entity_type_id = $this->getContextProperty('entity_type');
+    $bundle = $this->getContextProperty('entity_bundle');
+    $extra_fields = $this->entityFieldManager->getExtraFields($entity_type_id, $bundle);
+
+    if (!isset($extra_fields['display'])) {
+      return $sources;
+    }
+
+    foreach ($extra_fields['display'] as $extra_field_name => $field) {
+      if (!$this->getContextProperty('limit')) {
+        $sources[] = $this->getSourceField($extra_field_name, $field['label']);
+      }
+      elseif (in_array($extra_field_name, $this->getContextProperty('limit'))) {
+        $sources[] = $this->getSourceField($extra_field_name, $field['label']);
+      }
+    }
+
+    return $sources;
+  }
+
+}