public function FieldCollectionTabsFormatter::viewElements in Field Collection Tab formatter 8

Builds a renderable array for a field value.

Parameters

\Drupal\Core\Field\FieldItemListInterface $items: The field values to be rendered.

string $langcode: The language that should be used to render the field.

Return value

array A renderable array for $items, as an array of child elements keyed by consecutive numeric indexes starting from 0.

Overrides FormatterInterface::viewElements

File

src/Plugin/Field/FieldFormatter/FieldCollectionTabsFormatter.php, line 143

Class

FieldCollectionTabsFormatter

Plugin implementation of the 'tabs' formatter.

Namespace

Drupal\field_collection_tabs\Plugin\Field\FieldFormatter

Code

public function viewElements(FieldItemListInterface $items, $langcode) {
  $titles = [];
  $tabs = [];
  $title_field = !empty($this
    ->getSetting('title_field')) ? $this
    ->getSetting('title_field') : FALSE;
  $view_mode = !empty($this
    ->getSetting('view_mode')) ? $this
    ->getSetting('view_mode') : 'full';
  foreach ($items as $delta => $item) {
    if ($item->value !== NULL) {
      $field_collection_item = $item
        ->getFieldCollectionItem();
      $title = $field_collection_item
        ->get($title_field)->value;

      // Preventing a tab from not having a title, seems bad to not have a title for a tab.
      if ($title == '' || $title_field == FALSE) {
        $title = "Tab " . ($delta + 1);
      }
      $titles[] = $title;
      $render_item = $this->entityTypeManager
        ->getViewBuilder('field_collection_item')
        ->view($field_collection_item, $view_mode);
      $tabs[] = $render_item;
    }
  }
  $render_array = [
    '#theme' => 'field_collection_tabs',
    '#titles' => $titles,
    '#tabs' => $tabs,
    '#field_name' => $title_field,
    '#attached' => [
      'library' => [
        'field_collection_tabs/field_collection_tabs',
      ],
    ],
  ];
  return $render_array;
}