function protected function BootstrapCarousel::preprocessVariables

8.x-3.x BootstrapCarousel.php protected BootstrapCarousel::preprocessVariables(Variables $variables)

Preprocess the variables array.

Parameters

\Drupal\bootstrap\Utility\Variables $variables: The Variables object.

Overrides PreprocessBase::preprocessVariables

Class

BootstrapCarousel
Pre-processes variables for the "bootstrap_carousel" theme hook.

Namespace

Drupal\bootstrap\Plugin\Preprocess

Source src/Plugin/Preprocess/BootstrapCarousel.php (line 25)

protected function preprocessVariables(Variables $variables) {
  // Retrieve the ID, generating one if needed.
  $id = $variables->getAttribute('id', Html::getUniqueId($variables->offsetGet('id', 'bootstrap-carousel')));
  unset($variables['id']);

  // Build slides.
  foreach ($variables->slides as $key => &$slide) {
    if (!isset($slide['attributes'])) {
      $slide['attributes'] = [];
    }
    $slide['attributes'] = new Attribute($slide['attributes']);
  }

  // Build controls.
  if ($variables->controls) {
    $left_icon = Bootstrap::glyphicon('chevron-left');
    $right_icon = Bootstrap::glyphicon('chevron-right');
    $url = Url::fromUserInput("#$id");
    $variables->controls = [
      'left' => [
        '#type' => 'link',
        '#title' => new FormattableMarkup(Element::create($left_icon)->renderPlain() . '<span class="sr-only">@text</span>', ['@text' => t('Previous')]),
        '#url' => $url,
        '#attributes' => [
          'class' => ['left', 'carousel-control'],
          'role' => 'button',
          'data-slide' => 'prev',
        ],
      ],
      'right' => [
        '#type' => 'link',
        '#title' => new FormattableMarkup(Element::create($right_icon)->renderPlain() . '<span class="sr-only">@text</span>', ['@text' => t('Next')]),
        '#url' => $url,
        '#attributes' => [
          'class' => ['right', 'carousel-control'],
          'role' => 'button',
          'data-slide' => 'next',
        ],
      ],
    ];
  }

  // Build indicators.
  if ($variables->indicators) {
    $variables->indicators = [
      '#theme' => 'item_list__bootstrap_carousel_indicators',
      '#list_type' => 'ol',
      '#items' => array_keys($variables->slides),
      '#context' => [
        'target' => "#$id",
        'start_index' => $variables->start_index,
      ],
    ];
  }

  // Ensure all attributes are proper objects.
  $this->preprocessAttributes();
}