public function ImageStyleImageFormatter::viewElements in Field Image Style 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/ImageStyleImageFormatter.php, line 102

Class

ImageStyleImageFormatter

Plugin implementation of the 'image_style_formatter' formatter.

Namespace

Drupal\field_image_style\Plugin\Field\FieldFormatter

Code

public function viewElements(FieldItemListInterface $items, $langcode) {
  $elements = array();
  $files = $this
    ->getEntitiesToView($items, $langcode);

  // Early opt-out if the field is empty.
  if (empty($files)) {
    return $elements;
  }
  $url = NULL;
  $image_link_setting = $this
    ->getSetting('image_link');

  // Check if the formatter involves a link.
  if ($image_link_setting == 'content') {
    $entity = $items
      ->getEntity();
    if (!$entity
      ->isNew()) {
      $url = $entity
        ->toUrl();
    }
  }
  elseif ($image_link_setting == 'file') {
    $link_file = TRUE;
  }

  // Get image style from image style field
  $image_style_setting = NULL;
  if ($field_image_style_name = $this
    ->getSetting('field_image_style')) {
    $entity = $items
      ->getEntity();
    if (isset($entity->{$field_image_style_name})) {
      $image_style_setting = $entity->{$field_image_style_name}->value;
    }
  }

  // Collect cache tags to be added for each item in the field.
  $cache_tags = array();
  if (!empty($image_style_setting)) {
    $image_style = $this->imageStyleStorage
      ->load($image_style_setting);
    $cache_tags = $image_style
      ->getCacheTags();
  }
  foreach ($files as $delta => $file) {
    if (isset($link_file)) {
      $image_uri = $file
        ->getFileUri();
      $url = Url::fromUri(file_create_url($image_uri));
    }
    $cache_tags = Cache::mergeTags($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] = array(
      '#theme' => 'image_formatter',
      '#item' => $item,
      '#item_attributes' => $item_attributes,
      '#image_style' => $image_style_setting,
      '#url' => $url,
      '#cache' => array(
        'tags' => $cache_tags,
      ),
    );
  }
  return $elements;
}