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<?php
declare(strict_types=1);
namespace Drupal\navigation\Element;
use Drupal\Core\Render\Attribute\RenderElement;
use Drupal\Core\Render\Element\RenderElementBase;
use Drupal\navigation\TopBarItemManagerInterface;
use Drupal\navigation\TopBarRegion;
/**
* Provides a render element for the default Drupal toolbar.
*/
#[RenderElement('top_bar')]
class TopBar extends RenderElementBase {
/**
* {@inheritdoc}
*/
public function getInfo(): array {
return [
'#pre_render' => [
[static::class, 'preRenderTopBar'],
],
'#theme' => 'top_bar',
'#attached' => [
'library' => [
'navigation/internal.navigation',
],
],
];
}
/**
* Builds the TopBar as a structured array ready for rendering.
*
* Since building the TopBar takes some time, it is done just prior to
* rendering to ensure that it is built only if it will be displayed.
*
* @param array $element
* A renderable array.
*
* @return array
* A renderable array.
*
* @see navigation_page_top()
*/
public static function preRenderTopBar($element): array {
$top_bar_item_manager = static::topBarItemManager();
// Group the items by region.
foreach (TopBarRegion::cases() as $region) {
$items = $top_bar_item_manager->getRenderedTopBarItemsByRegion($region);
$element = array_merge($element, [$region->value => $items]);
}
return $element;
}
/**
* Wraps the top bar item manager.
*
* @return \Drupal\navigation\TopBarItemManager
* The top bar item manager.
*/
protected static function topBarItemManager(): TopBarItemManagerInterface {
return \Drupal::service(TopBarItemManagerInterface::class);
}
}
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