public function FieldSlideshow::viewElements in Field Slideshow 8.3

Same name and namespace in other branches

1. 8 src/Plugin/Field/FieldFormatter/FieldSlideshow.php \Drupal\field_slideshow\Plugin\Field\FieldFormatter\FieldSlideshow::viewElements()
2. 8.2 src/Plugin/Field/FieldFormatter/FieldSlideshow.php \Drupal\field_slideshow\Plugin\Field\FieldFormatter\FieldSlideshow::viewElements()

View elements.

Parameters

\Drupal\Core\Field\FieldItemListInterface $items: Items.

string $langcode: Langcode.

Return value

array Rendered array.

Throws

\Exception

Overrides ImageFormatter::viewElements

File

src/Plugin/Field/FieldFormatter/FieldSlideshow.php, line 452

Class

FieldSlideshow

Plugin implementation of the 'slideshow' formatter.

Namespace

Drupal\field_slideshow\Plugin\Field\FieldFormatter

Code

public function viewElements(FieldItemListInterface $items, $langcode) {
  $itemListInterface = $items;
  $id = Html::getUniqueId('field-slideshow-id');
  $slideshow_settings = $this
    ->getSetting('slideshow');
  $files = $this
    ->getEntitiesToView($items, $langcode);
  $items = parent::viewElements($items, $langcode);
  $pager = NULL;
  if (!count($items)) {
    return [];
  }
  if (count($items) > 1) {
    $pager = $this
      ->getSetting('slideshow_pager');
    $pagerType = $this->pagerManager
      ->createInstance($pager['pager_type']);
    $pager['pager_type'] = $pagerType
      ->viewPager($itemListInterface);
  }
  $output = [];

  // Load cycle2swipe if needed.
  if ($slideshow_settings['swipe']) {
    $libraries[] = 'field_slideshow/field_slideshow.cycle2swipe';
  }
  $libraries[] = 'field_slideshow/field_slideshow.cycle2';
  if ($this
    ->getSetting('image_link') === 'colorbox') {
    $colorbox_style_setting = $this
      ->getSetting('colorbox_image_style');
    if (!empty($colorbox_style_setting)) {
      $image_style = $this->imageStyleStorage
        ->load($colorbox_style_setting);
    }
    $options = [
      'attributes' => [
        'class' => [
          'colorbox',
        ],
        'data-colorbox-gallery' => 'gallery-' . $id,
      ],
    ];
    foreach ($items as $key => $item) {

      // Create colorbox image url with image style.
      $original_url = $url = $files[$key]
        ->getFileUri();
      if (isset($image_style)) {
        $url = $image_style
          ->buildUri($original_url);
        if (!file_exists($url)) {
          $image_style
            ->createDerivative($original_url, $url);
        }
      }
      $url = Url::fromUri(file_create_url($url), $options);

      // Image-formatter.html.twig does not give
      // ability to add url attributes like class.
      $img = $this->renderer
        ->render($items[$key]);
      $link = Link::fromTextAndUrl($img, $url);
      $items[$key] = $link
        ->toString();
    }

    // We can't use dependency injection for this
    // service because colorbox is optional.
    \Drupal::service('colorbox.attachment')
      ->attach($output);
  }
  $output = array_merge_recursive($output, [
    '#theme' => 'field_slideshow',
    '#items' => $items,
    '#pager' => $pager,
    '#id' => $id,
    '#attached' => [
      'library' => $libraries,
      'drupalSettings' => [
        'field_slideshow' => [
          $id => $slideshow_settings,
        ],
      ],
    ],
  ]);
  return $output;
}