aleph1.co.uk Git - yaffs-website/blob - web/themes/contrib/bootstrap/src/Plugin/Preprocess/BootstrapCarousel.php

   1 <?php
   2 /**
   3  * @file
   4  * Contains \Drupal\bootstrap\Plugin\Preprocess\BootstrapCarousel.
   5  */
   6
   7 namespace Drupal\bootstrap\Plugin\Preprocess;
   8
   9 use Drupal\bootstrap\Annotation\BootstrapPreprocess;
  10 use Drupal\bootstrap\Bootstrap;
  11 use Drupal\bootstrap\Utility\Element;
  12 use Drupal\bootstrap\Utility\Variables;
  13 use Drupal\Component\Render\FormattableMarkup;
  14 use Drupal\Component\Utility\Html;
  15 use Drupal\Core\Template\Attribute;
  16 use Drupal\Core\Url;
  17
  18 /**
  19  * Pre-processes variables for the "bootstrap_carousel" theme hook.
  20  *
  21  * @ingroup plugins_preprocess
  22  *
  23  * @BootstrapPreprocess("bootstrap_carousel")
  24  */
  25 class BootstrapCarousel extends PreprocessBase implements PreprocessInterface {
  26
  27   /**
  28    * {@inheritdoc}
  29    */
  30   protected function preprocessVariables(Variables $variables) {
  31     // Retrieve the ID, generating one if needed.
  32     $id = $variables->getAttribute('id', Html::getUniqueId($variables->offsetGet('id', 'bootstrap-carousel')));
  33     unset($variables['id']);
  34
  35     // Build slides.
  36     foreach ($variables->slides as $key => &$slide) {
  37       if (!isset($slide['attributes'])) {
  38         $slide['attributes'] = [];
  39       }
  40       $slide['attributes'] = new Attribute($slide['attributes']);
  41     }
  42
  43     // Build controls.
  44     if ($variables->controls) {
  45       $left_icon = Bootstrap::glyphicon('chevron-left');
  46       $right_icon = Bootstrap::glyphicon('chevron-right');
  47       $url = Url::fromUserInput("#$id");
  48       $variables->controls = [
  49         'left' => [
  50           '#type' => 'link',
  51           '#title' => new FormattableMarkup(Element::create($left_icon)->renderPlain() . '<span class="sr-only">@text</span>', ['@text' => t('Previous')]),
  52           '#url' => $url,
  53           '#attributes' => [
  54             'class' => ['left', 'carousel-control'],
  55             'role' => 'button',
  56             'data-slide' => 'prev',
  57           ],
  58         ],
  59         'right' => [
  60           '#type' => 'link',
  61           '#title' => new FormattableMarkup(Element::create($right_icon)->renderPlain() . '<span class="sr-only">@text</span>', ['@text' => t('Next')]),
  62           '#url' => $url,
  63           '#attributes' => [
  64             'class' => ['right', 'carousel-control'],
  65             'role' => 'button',
  66             'data-slide' => 'next',
  67           ],
  68         ],
  69       ];
  70     }
  71
  72     // Build indicators.
  73     if ($variables->indicators) {
  74       $variables->indicators = [
  75         '#theme' => 'item_list__bootstrap_carousel_indicators',
  76         '#list_type' => 'ol',
  77         '#items' => array_keys($variables->slides),
  78         '#target' => "#$id",
  79         '#start_index' => $variables->start_index,
  80       ];
  81     }
  82
  83     // Ensure all attributes are proper objects.
  84     $this->preprocessAttributes();
  85   }
  86
  87 }