public function ImagefieldSlideshowFieldFormatter::viewElements in Imagefield Slideshow 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/ImagefieldSlideshowFieldFormatter.php, line 290

Class

ImagefieldSlideshowFieldFormatter

Plugin implementation of 'imagefield_slideshow_field_formatter' formatter.

Namespace

Drupal\imagefield_slideshow\Plugin\Field\FieldFormatter

Code

public function viewElements(FieldItemListInterface $items, $langcode) {
  $elements = [];

  // Get the Entity value as array.
  $file = $items
    ->getEntity()
    ->toArray();

  // Early opt-out if the field is empty.
  $images = $this
    ->getEntitiesToView($items, $langcode);
  if (empty($images)) {
    return $elements;
  }
  $image_style_setting = $this
    ->getSetting('imagefield_slideshow_style');
  $image_style = NULL;
  if (!empty($image_style_setting)) {
    $image_style = \Drupal::entityTypeManager()
      ->getStorage('image_style')
      ->load($image_style_setting);
  }
  $image_uri_values = [];
  foreach ($images as $image) {
    $image_uri = $image
      ->getFileUri();

    // Get image style URL.
    if ($image_style) {
      $image_uri = ImageStyle::load($image_style
        ->getName())
        ->buildUrl($image_uri);
    }
    else {

      // Get absolute path for original image.
      $image_uri = $image
        ->createFileUrl(FALSE);
    }

    // Populate image uri's with fid.
    $fid = $image
      ->toArray()['fid'][0]['value'];
    $image_uri_values[$fid] = [
      'uri' => $image_uri,
    ];
  }

  // Populate the title and alt of images based on fid.
  foreach ([
    'title',
    'alt',
  ] as $element_name) {
    $field_name = $this->fieldDefinition
      ->getName();
    if (array_key_exists($field_name, $file)) {
      foreach ($file[$field_name] as $key => $value) {
        $image_uri_values[$value['target_id']]['alt'] = $value['alt'];
        $image_uri_values[$value['target_id']]['title'] = $value['title'];
      }
    }
  }

  // Enable prev next if only more than one image.
  $prev_next = $this
    ->getSetting('imagefield_slideshow_prev_next');
  if (count($image_uri_values) <= 1) {
    $prev_next = FALSE;
  }
  $elements[] = [
    '#theme' => 'imagefield_slideshow',
    '#url' => $image_uri_values,
    '#prev_next' => $prev_next,
    '#effect' => $this
      ->getSetting('imagefield_slideshow_style_effects'),
    '#pause' => $this
      ->getSetting('imagefield_slideshow_style_pause'),
    '#speed' => $this
      ->getSetting('imagefield_slideshow_transition_speed'),
    '#timeout' => $this
      ->getSetting('imagefield_slideshow_timeout'),
    '#pager' => $this
      ->getSetting('imagefield_slideshow_pager'),
  ];

  // Attach the image field slide show library.
  $elements['#attached']['library'][] = 'imagefield_slideshow/imagefield_slideshow';

  // Not to cache this field formatter.
  $elements['#cache']['max-age'] = 0;
  return $elements;
}