Prevent empty groups to be displayed.

modules/ui_patterns_field_group/src/Plugin/field_group/FieldGroupFormatter/PatternFormatter.php

@@ -128,6 +128,8 @@ protected function preRenderGroup(array &$element, $group_name, array $rendering
 
  // Handle groups managed by UI Patterns recursively.
  if ($group->format_type == 'pattern_formatter') {
+ $element['#is_empty'] = TRUE;
+
  // Move content into their fields.
  foreach ($group->format_settings['pattern_mapping'] as $field) {
  if ($field['plugin'] == 'fieldgroup') {
@@ -136,13 +138,35 @@ protected function preRenderGroup(array &$element, $group_name, array $rendering
  }
  else {
  $this->preRenderGroup($element[$field['source']], $field['source'], $rendering_object);
+ if (!empty($element[$field['source']]) && !$element[$field['source']]['#is_empty']) {
+ $element['#is_empty'] = FALSE;
+ }
+ }
+ }
+ elseif ($field['plugin'] == 'fields') {
+ /** @var \Drupal\Core\Entity\EntityInterface $entity */
+ $entity = $rendering_object['#' . $rendering_object['#entity_type']];
+
+ // Use entity field so the hypothetical rendering elements are not
+ // to be taken into account to consider the field empty or not.
+ if ($entity->hasField($field['source']) && !$entity->{$field['source']}->isEmpty()) {
+ $element['#is_empty'] = FALSE;
  }
  }
+ elseif (!empty($element[$field['source']])) {
+ $element['#is_empty'] = FALSE;
+ }
  $element['#fields'][$field['destination']][$field['source']] = $element[$field['source']];
  }
 
- // Add render array metadata.
- $this->addRenderContext($element, $group->format_settings);
+ // Prevent to show the group if fields are empty.
+ if ($element['#is_empty'] && empty($group->format_settings['show_empty_fields'])) {
+ $element = [];
+ }
+ else {
+ // Add render array metadata.
+ $this->addRenderContext($element, $group->format_settings);
+ }
  }
  // Fallback to default pre_rendering for fieldgroups not managed by UI
  // Patterns.