ToolbarHandler.php

<?php

namespace Drupal\devel;

use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
use Drupal\Core\Session\AccountProxyInterface;
use Drupal\Core\StringTranslation\StringTranslationTrait;
use Drupal\Core\Url;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Toolbar integration handler.
 */
class ToolbarHandler implements ContainerInjectionInterface {
    use StringTranslationTrait;
    
    /**
     * The current user.
     */
    protected AccountProxyInterface $account;
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) : self {
        $instance = new self();
        $instance->account = $container->get('current_user');
        $instance->stringTranslation = $container->get('string_translation');
        return $instance;
    }
    
    /**
     * Hook bridge.
     *
     * @return array
     *   The devel toolbar items render array.
     *
     * @see hook_toolbar()
     */
    public function toolbar() {
        $items['devel'] = [
            '#cache' => [
                'contexts' => [
                    'user.permissions',
                ],
            ],
        ];
        if ($this->account
            ->hasPermission('access devel information')) {
            $items['devel'] += [
                '#type' => 'toolbar_item',
                '#weight' => 999,
                'tab' => [
                    '#type' => 'link',
                    '#title' => $this->t('Devel'),
                    '#url' => Url::fromRoute('devel.admin_settings'),
                    '#attributes' => [
                        'title' => $this->t('Development menu'),
                        'class' => [
                            'toolbar-icon',
                            'toolbar-icon-devel',
                        ],
                    ],
                ],
                'tray' => [
                    '#heading' => $this->t('Development menu'),
                    'devel_menu' => [
                        // Currently devel menu is uncacheable, so instead of poisoning the
                        // entire page cache we use a lazy builder.
                        // @see \Drupal\devel\Plugin\Menu\DestinationMenuLink
                        // @see \Drupal\devel\Plugin\Menu\RouteDetailMenuItem
'#lazy_builder' => [
                            'devel.lazy_builders:renderMenu',
                            [],
                        ],
                        // Force the creation of the placeholder instead of rely on the
                        // automatical placeholdering or otherwise the page results
                        // uncacheable when max-age 0 is bubbled up.
'#create_placeholder' => TRUE,
                    ],
                    'configuration' => [
                        '#type' => 'link',
                        '#title' => $this->t('Configure'),
                        '#url' => Url::fromRoute('devel.toolbar.settings_form'),
                        '#options' => [
                            'attributes' => [
                                'class' => [
                                    'edit-devel-toolbar',
                                ],
                            ],
                        ],
                    ],
                ],
                '#attached' => [
                    'library' => 'devel/devel-toolbar',
                ],
            ];
        }
        return $items;
    }

}