class UiTabs

class UiTabs extends TabRendererBase {
    
    /**
     * {@inheritdoc}
     */
    public function render(QuickTabsInstance $instance) {
        $qt_id = $instance->id();
        $type = \Drupal::service('plugin.manager.tab_type');
        // The render array used to build the block.
        $build = [];
        $build['pages'] = [];
        // Pages of content that will be shown or hidden.
        $tab_pages = [];
        // Tabs used to show/hide content.
        $titles = [];
        foreach ($instance->getConfigurationData() as $index => $tab) {
            $object = $type->createInstance($tab['type']);
            $render = $object->render($tab);
            // If user wants to hide empty tabs and there is no content
            // then skip to next tab.
            if ($instance->getHideEmptyTabs() && empty($render)) {
                continue;
            }
            $tab_num = $index + 1;
            $attributes = new Attribute([
                'id' => 'qt-' . $qt_id . '-ui-tabs' . $tab_num,
            ]);
            if (!empty($tab['content'][$tab['type']]['options']['display_title']) && !empty($tab['content'][$tab['type']]['options']['block_title'])) {
                $build['pages'][$index]['#title'] = $tab['content'][$tab['type']]['options']['block_title'];
            }
            $build['pages'][$index]['#block'] = $render;
            $build['pages'][$index]['#prefix'] = '<div ' . $attributes . '>';
            $build['pages'][$index]['#suffix'] = '</div>';
            $build['pages'][$index]['#theme'] = 'quicktabs_block_content';
            $href = '#qt-' . $qt_id . '-ui-tabs' . $tab_num;
            $titles[] = [
                '#markup' => '<a href="' . $href . '">' . new TranslatableMarkup($tab['title']) . '</a>',
            ];
            $tab_pages[] = $tab;
        }
        // Add a wrapper.
        $build['#theme_wrappers'] = [
            'container' => [
                '#attributes' => [
                    'class' => [
                        'quicktabs-ui-wrapper',
                    ],
                    'id' => 'quicktabs-' . $qt_id,
                ],
            ],
        ];
        $tabs = [
            '#theme' => 'item_list',
            '#items' => $titles,
        ];
        // Add tabs to the build.
        array_unshift($build, $tabs);
        // Attach js.
        $default_tab = $instance->getDefaultTab();
        $build['#attached'] = [
            'library' => [
                'quicktabs_jqueryui/quicktabs.ui',
            ],
            'drupalSettings' => [
                'quicktabs' => [
                    'qt_' . $qt_id => [
                        'tabs' => $tab_pages,
                        'default_tab' => $default_tab,
                    ],
                ],
            ],
        ];
        return $build;
    }

}