class TourViewBuilder

class TourViewBuilder extends EntityViewBuilder {
    
    /**
     * {@inheritdoc}
     */
    public function viewMultiple(array $entities = [], $view_mode = 'full', $langcode = NULL) {
        
        /** @var \Drupal\tour\TourInterface[] $entities */
        $tour = [];
        $cache_tags = [];
        $total_tips = 0;
        foreach ($entities as $entity_id => $entity) {
            $tour[$entity_id] = $entity->getTips();
            $total_tips += count($tour[$entity_id]);
            $cache_tags = Cache::mergeTags($cache_tags, $entity->getCacheTags());
        }
        $items = [];
        foreach ($tour as $tour_id => $tips) {
            $tourEntity = $entities[$tour_id];
            foreach ($tips as $index => $tip) {
                $classes = [
                    'tip-module-' . Html::getClass($tourEntity->getModule()),
                    'tip-type-' . Html::getClass($tip->getPluginId()),
                    'tip-' . Html::getClass($tip->id()),
                ];
                $selector = $tip->getSelector();
                $location = $tip->getLocation();
                $body_render_array = $tip->getBody();
                $body = (string) \Drupal::service('renderer')->renderInIsolation($body_render_array);
                $output = [
                    'body' => $body,
                    'title' => $tip->getLabel(),
                ];
                $selector = $tip->getSelector();
                if ($output) {
                    $items[] = [
                        'id' => $tip->id(),
                        'selector' => $selector,
                        'module' => $tourEntity->getModule(),
                        'type' => $tip->getPluginId(),
                        'counter' => $this->t('@tour_item of @total', [
                            '@tour_item' => $index + 1,
                            '@total' => $total_tips,
                        ]),
                        'attachTo' => [
                            'element' => $selector,
                            'on' => $location ?? 'bottom-start',
                        ],
                        // Shepherd expects classes to be provided as a string.
'classes' => implode(' ', $classes),
                    ] + $output;
                }
            }
        }
        // If there is at least one tour item, build the tour.
        if ($items) {
            $key = array_key_last($items);
            $items[$key]['cancelText'] = t('End tour');
        }
        $build = [
            '#cache' => [
                'tags' => $cache_tags,
            ],
        ];
        // If at least one tour was built, attach tips and the tour library.
        if ($items) {
            $build['#attached']['drupalSettings']['tourShepherdConfig'] = [
                'defaultStepOptions' => [
                    'classes' => 'drupal-tour',
                    'cancelIcon' => [
                        'enabled' => TRUE,
                        'label' => $this->t('Close'),
                    ],
                    'modalOverlayOpeningPadding' => 3,
                    'scrollTo' => [
                        'behavior' => 'smooth',
                        'block' => 'center',
                    ],
                    'popperOptions' => [
                        'modifiers' => [
                            // Prevent overlap with the element being highlighted.
[
                                'name' => 'offset',
                                'options' => [
                                    'offset' => [
                                        -10,
                                        20,
                                    ],
                                ],
                            ],
                            // Pad the arrows so they don't hit the edge of rounded corners.
[
                                'name' => 'arrow',
                                'options' => [
                                    'padding' => 12,
                                ],
                            ],
                            // Disable Shepherd's focusAfterRender modifier, which results in
                            // the tour item container being focused on any scroll or resize
                            // event.
[
                                'name' => 'focusAfterRender',
                                'enabled' => FALSE,
                            ],
                        ],
                    ],
                ],
                'useModalOverlay' => TRUE,
            ];
            // This property is used for storing the tour items. It may change without
            // notice and should not be extended or modified in contrib.
            // see: https://www.drupal.org/project/drupal/issues/3214593
            $build['#attached']['drupalSettings']['_tour_internal'] = $items;
            $build['#attached']['library'][] = 'tour/tour';
        }
        return $build;
    }

}