public function ReadmoreFormatter::viewElements in Readmore 8

Same name and namespace in other branches

1. 2.x src/Plugin/Field/FieldFormatter/ReadmoreFormatter.php \Drupal\readmore\Plugin\Field\FieldFormatter\ReadmoreFormatter::viewElements()

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/ReadmoreFormatter.php, line 151

Contains \Drupal\readmore\Plugin\field\FieldFormatter\ReadmoreFormatter.

Class

ReadmoreFormatter

Plugin implementation of the 'readmore' formatter.

Namespace

Drupal\readmore\Plugin\Field\FieldFormatter

Code

public function viewElements(FieldItemListInterface $items, $langcode) {
  $elements = [];
  $settings = $this
    ->getSettings();
  $current_path = \Drupal::service('path.current')
    ->getPath();
  $url_object = \Drupal::service('path.validator')
    ->getUrlIfValid($current_path);
  $route_name = $url_object
    ->getRouteName();
  $route_parameters = $url_object
    ->getRouteParameters();
  $current_url = Url::fromRoute($route_name, $route_parameters, [
    'absolute' => TRUE,
  ]);
  $read_less = $this
    ->t('Read less');
  $read_more = $this
    ->t('Read more');

  // Prepare readless link.
  $link_less = Link::fromTextAndUrl($read_less, $current_url);
  $link_less = $link_less
    ->toRenderable();
  $link_less['#attributes']['class'][] = 'readless-link';

  // Prepare readmore link.
  $link_more = Link::fromTextAndUrl($read_more, $current_url);
  $link_more = $link_more
    ->toRenderable();
  $link_more['#attributes']['class'][] = 'readmore-link';
  foreach ($items as $delta => $item) {
    $text = $item->value;
    $text_length = Unicode::strlen($text);
    $trim_length = $settings['trim_length'];

    // Don't do anything if text length less than defined.
    if ($text_length > $trim_length) {

      // Add Read less if need.
      if ($settings['show_readless']) {
        $text .= ' ' . render($link_less);
      }

      // Get trimmed string.
      $summary = readmore_truncate_string($text, isset($item->format) ? $item->format : NULL, $trim_length, $settings['wordsafe'], $settings['trim_on_break']);

      // Add readmore link.
      $summary .= '<span>';
      $summary .= $settings['ellipsis'] ? $this
        ->t('...') : NULL;
      if ($settings['show_readmore']) {
        $summary .= render($link_more);
      }
      $summary .= '</span>';

      // Close all HTML tags.
      $summary = Html::normalize($summary);
      $elements[$delta] = [
        '#theme' => 'readmore',
        '#summary' => Markup::create($summary),
        '#text' => Markup::create($text),
      ];
    }
    else {
      $elements[$delta] = [
        '#markup' => $text,
      ];
    }
  }
  $elements['#attached']['library'][] = 'readmore/readmore';
  return $elements;
}