ChooseSectionController.php

<?php

namespace Drupal\layout_builder\Controller;

use Drupal\Core\Ajax\AjaxHelperTrait;
use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
use Drupal\Core\Layout\LayoutPluginManagerInterface;
use Drupal\Core\Plugin\PluginFormInterface;
use Drupal\Core\StringTranslation\StringTranslationTrait;
use Drupal\Core\Url;
use Drupal\layout_builder\Context\LayoutBuilderContextTrait;
use Drupal\layout_builder\LayoutBuilderHighlightTrait;
use Drupal\layout_builder\SectionStorageInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Defines a controller to choose a new section.
 *
 * @internal
 *   Controller classes are internal.
 */
class ChooseSectionController implements ContainerInjectionInterface {
    use AjaxHelperTrait;
    use LayoutBuilderContextTrait;
    use LayoutBuilderHighlightTrait;
    use StringTranslationTrait;
    
    /**
     * The layout manager.
     *
     * @var \Drupal\Core\Layout\LayoutPluginManagerInterface
     */
    protected $layoutManager;
    
    /**
     * ChooseSectionController constructor.
     *
     * @param \Drupal\Core\Layout\LayoutPluginManagerInterface $layout_manager
     *   The layout manager.
     */
    public function __construct(LayoutPluginManagerInterface $layout_manager) {
        $this->layoutManager = $layout_manager;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('plugin.manager.core.layout'));
    }
    
    /**
     * Choose a layout plugin to add as a section.
     *
     * @param \Drupal\layout_builder\SectionStorageInterface $section_storage
     *   The section storage.
     * @param int $delta
     *   The delta of the section to splice.
     *
     * @return array
     *   The render array.
     */
    public function build(SectionStorageInterface $section_storage, int $delta) {
        $items = [];
        $definitions = $this->layoutManager
            ->getFilteredDefinitions('layout_builder', $this->getPopulatedContexts($section_storage), [
            'section_storage' => $section_storage,
        ]);
        foreach ($definitions as $plugin_id => $definition) {
            $layout = $this->layoutManager
                ->createInstance($plugin_id);
            $item = [
                '#type' => 'link',
                '#title' => [
                    'icon' => $definition->getIcon(60, 80, 1, 3),
                    'label' => [
                        '#type' => 'container',
                        '#children' => $definition->getLabel(),
                    ],
                ],
                '#url' => Url::fromRoute($layout instanceof PluginFormInterface ? 'layout_builder.configure_section' : 'layout_builder.add_section', [
                    'section_storage_type' => $section_storage->getStorageType(),
                    'section_storage' => $section_storage->getStorageId(),
                    'delta' => $delta,
                    'plugin_id' => $plugin_id,
                ]),
            ];
            if ($this->isAjax()) {
                $item['#attributes']['class'][] = 'use-ajax';
                $item['#attributes']['data-dialog-type'][] = 'dialog';
                $item['#attributes']['data-dialog-renderer'][] = 'off_canvas';
            }
            $items[$plugin_id] = $item;
        }
        $output['layouts'] = [
            '#theme' => 'item_list__layouts',
            '#items' => $items,
            '#attributes' => [
                'class' => [
                    'layout-selection',
                ],
                'data-layout-builder-target-highlight-id' => $this->sectionAddHighlightId($delta),
            ],
        ];
        return $output;
    }

}