TourViewBuilder.php

<?php

namespace Drupal\tour;

use Drupal\Core\Entity\EntityViewBuilder;
use Drupal\Component\Utility\Html;

/**
 * Provides a Tour view builder.
 */
class TourViewBuilder extends EntityViewBuilder {
    
    /**
     * {@inheritdoc}
     */
    public function viewMultiple(array $entities = [], $view_mode = 'full', $langcode = NULL) {
        
        /** @var \Drupal\tour\TourInterface[] $entities */
        $build = [];
        foreach ($entities as $entity_id => $entity) {
            $tips = $entity->getTips();
            $count = count($tips);
            $list_items = [];
            foreach ($tips as $index => $tip) {
                if ($output = $tip->getOutput()) {
                    $attributes = [
                        'class' => [
                            'tip-module-' . Html::cleanCssIdentifier($entity->getModule()),
                            'tip-type-' . Html::cleanCssIdentifier($tip->getPluginId()),
                            'tip-' . Html::cleanCssIdentifier($tip->id()),
                        ],
                    ];
                    $list_items[] = [
                        'output' => $output,
                        'counter' => [
                            '#type' => 'container',
                            '#attributes' => [
                                'class' => [
                                    'tour-progress',
                                ],
                            ],
                            '#children' => t('@tour_item of @total', [
                                '@tour_item' => $index + 1,
                                '@total' => $count,
                            ]),
                        ],
                        '#wrapper_attributes' => $tip->getAttributes() + $attributes,
                    ];
                }
            }
            // If there is at least one tour item, build the tour.
            if ($list_items) {
                end($list_items);
                $key = key($list_items);
                $list_items[$key]['#wrapper_attributes']['data-text'] = t('End tour');
                $build[$entity_id] = [
                    '#theme' => 'item_list',
                    '#items' => $list_items,
                    '#list_type' => 'ol',
                    '#attributes' => [
                        'id' => 'tour',
                        'class' => [
                            'hidden',
                        ],
                    ],
                    '#cache' => [
                        'tags' => $entity->getCacheTags(),
                    ],
                ];
            }
        }
        // If at least one tour was built, attach the tour library.
        if ($build) {
            $build['#attached']['library'][] = 'tour/tour';
        }
        return $build;
    }

}