public function CollageFormatter::viewElements in Collage 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 ImageFormatter::viewElements

File

src/Plugin/Field/FieldFormatter/CollageFormatter.php, line 370

Contains \Drupal\collageformatter\src\Plugin\Field\FieldFormatter\CollageFormatter.

Class

CollageFormatter

Plugin implementation of the 'collageformatter' formatter.

Namespace

Drupal\collageformatter\Plugin\Field\FieldFormatter

Code

public function viewElements(FieldItemListInterface $items, $langcode) {

  // $elements = parent::viewElements($items, $langcode);
  $elements = [];
  $files = $this
    ->getEntitiesToView($items, $langcode);
  $settings = $this
    ->getSettings();
  $entity = $items
    ->getEntity();

  // Early opt-out if the field is empty.
  if (empty($files)) {
    return $elements;
  }
  $settings['gallery'] = 'collageformatter-' . 'field_image' . '-' . $entity
    ->id();
  $url = NULL;
  $image_link_settings = $this
    ->getSetting('image_link');

  // Link the contents if the image is supposed to link with contents
  if ($image_link_settings == 'content') {
    if (!$entity
      ->isNew()) {
      $url = $entity
        ->urlInfo();
    }
  }
  elseif ($image_link_settings == 'file') {
    $link_file = TRUE;
  }
  $image_style_setting = $this
    ->getSetting('image_style');

  // Collect cache tags to be added for each item in the field.
  $base_cache_tags = [];
  if (!empty($image_style_setting)) {
    $image_style = $this->imageStyleStorage
      ->load($image_style_setting);
    $base_cache_tags = $image_style
      ->getCacheTags();
  }
  foreach ($files as $delta => $file) {
    $cache_contexts = [];
    if (isset($link_file)) {
      $image_uri = $file
        ->getFileUri();

      // @todo Wrap in file_url_transform_relative(). This is currently
      // impossible. As a work-around, we currently add the 'url.site' cache
      // context to ensure different file URLs are generated for different
      // sites in a multisite setup, including HTTP and HTTPS versions of the
      // same site. Fix in https://www.drupal.org/node/2646744.
      $url = Url::fromUri(file_create_url($image_uri));
      $cache_contexts[] = 'url.site';
    }
    $cache_tags = Cache::mergeTags($base_cache_tags, $file
      ->getCacheTags());

    // Extract field item attributes for the theme function, and unset them
    // from the $item so that the field template does not re-render them.
    $item = $file->_referringItem;
    $item_attributes = $item->_attributes;
    unset($item->_attributes);
    $elements[$delta] = [
      '#item' => $item,
      '#item_attributes' => $item_attributes,
      '#image_style' => $image_style_setting,
      '#url' => $url,
      '#cache' => [
        'tags' => $cache_tags,
        'contexts' => $cache_contexts,
      ],
    ];
  }
  $elements[$delta] += $this
    ->collageformatter_render_collage($files, $settings);
  return $elements;
}