ToolbarTestHooks.php

<?php

declare (strict_types=1);
namespace Drupal\toolbar_test\Hook;

use Drupal\Core\Link;
use Drupal\Core\Url;
use Drupal\Core\Hook\Attribute\Hook;

/**
 * Hook implementations for toolbar_test.
 */
class ToolbarTestHooks {
    
    /**
     * Implements hook_toolbar().
     */
    public function toolbar() {
        $items['testing'] = [
            '#type' => 'toolbar_item',
            'tab' => [
                '#type' => 'link',
                '#title' => t('Test tab'),
                '#url' => Url::fromRoute('<front>'),
                '#options' => [
                    'attributes' => [
                        'id' => 'toolbar-tab-testing',
                        'title' => t('Test tab'),
                    ],
                ],
            ],
            'tray' => [
                '#heading' => t('Test tray'),
                '#wrapper_attributes' => [
                    'id' => 'toolbar-tray-testing',
                ],
                'content' => [
                    '#theme' => 'item_list',
                    '#items' => [
                        Link::fromTextAndUrl(t('link 1'), Url::fromRoute('<front>', [], [
                            'attributes' => [
                                'title' => 'Test link 1 title',
                            ],
                        ]))->toRenderable(),
                        Link::fromTextAndUrl(t('link 2'), Url::fromRoute('<front>', [], [
                            'attributes' => [
                                'title' => 'Test link 2 title',
                            ],
                        ]))->toRenderable(),
                        Link::fromTextAndUrl(t('link 3'), Url::fromRoute('<front>', [], [
                            'attributes' => [
                                'title' => 'Test link 3 title',
                            ],
                        ]))->toRenderable(),
                    ],
                    '#attributes' => [
                        'class' => [
                            'toolbar-menu',
                        ],
                    ],
                ],
            ],
            '#weight' => 50,
        ];
        $items['empty'] = [
            '#type' => 'toolbar_item',
        ];
        return $items;
    }

}