J'ai donc fini par trouver du code qui me permettrait de le faire, en créant un bloc personnalisé et, dans la méthode de construction, en affichant le menu avec des transformateurs ajoutés. C'est le lien que j'ai utilisé pour comprendre comment obtenir le menu dans le bloc et y ajouter des transformateurs: http://alexrayu.com/blog/drupal-8-display-submenu-block . J'ai build()fini par ressembler à ceci:
$menu_tree = \Drupal::menuTree();
$menu_name = 'main';
// Build the typical default set of menu tree parameters.
$parameters = $menu_tree->getCurrentRouteMenuTreeParameters($menu_name);
// Load the tree based on this set of parameters.
$tree = $menu_tree->load($menu_name, $parameters);
// Transform the tree using the manipulators you want.
$manipulators = array(
// Only show links that are accessible for the current user.
array('callable' => 'menu.default_tree_manipulators:checkAccess'),
// Use the default sorting of menu links.
array('callable' => 'menu.default_tree_manipulators:generateIndexAndSort'),
// Remove all links outside of siblings and active trail
array('callable' => 'intranet.menu_transformers:removeInactiveTrail'),
);
$tree = $menu_tree->transform($tree, $manipulators);
// Finally, build a renderable array from the transformed tree.
$menu = $menu_tree->build($tree);
return array(
'#markup' => \Drupal::service('renderer')->render($menu),
'#cache' => array(
'contexts' => array('url.path'),
),
);
Le transformateur est un service, j'ai donc ajouté un intranet.services.ymlà mon module intranet, pointant vers la classe que j'ai fini par définir. La classe avait trois méthodes:, removeInactiveTrail()qui appelait getCurrentParent()pour obtenir le parent de la page sur laquelle l'utilisateur était actuellement, et stripChildren(), qui supprimait le menu uniquement aux enfants de l'élément de menu actuel et de ses frères et sœurs (c'est-à-dire: supprimait tous les sous-menus qui étaient ' t dans la piste active).
Voici à quoi cela ressemblait:
/**
* Removes all link trails that are not siblings to the active trail.
*
* For a menu such as:
* Parent 1
* - Child 1
* -- Child 2
* -- Child 3
* -- Child 4
* - Child 5
* Parent 2
* - Child 6
* with current page being Child 3, Parent 2, Child 6, and Child 5 would be
* removed.
*
* @param \Drupal\Core\Menu\MenuLinkTreeElement[] $tree
* The menu link tree to manipulate.
*
* @return \Drupal\Core\Menu\MenuLinkTreeElement[]
* The manipulated menu link tree.
*/
public function removeInactiveTrail(array $tree) {
// Get the current item's parent ID
$current_item_parent = IntranetMenuTransformers::getCurrentParent($tree);
// Tree becomes the current item parent's children if the current item
// parent is not empty. Otherwise, it's already the "parent's" children
// since they are all top level links.
if (!empty($current_item_parent)) {
$tree = $current_item_parent->subtree;
}
// Strip children from everything but the current item, and strip children
// from the current item's children.
$tree = IntranetMenuTransformers::stripChildren($tree);
// Return the tree.
return $tree;
}
/**
* Get the parent of the current active menu link, or return NULL if the
* current active menu link is a top-level link.
*
* @param \Drupal\Core\Menu\MenuLinkTreeElement[] $tree
* The tree to pull the parent link out of.
* @param \Drupal\Core\Menu\MenuLinkTreeElement|null $prev_parent
* The previous parent's parent, or NULL if no previous parent exists.
* @param \Drupal\Core\Menu\MenuLinkTreeElement|null $parent
* The parent of the current active link, or NULL if not parent exists.
*
* @return \Drupal\Core\Menu\MenuLinkTreeElement|null
* The parent of the current active menu link, or NULL if no parent exists.
*/
private function getCurrentParent($tree, $prev_parent = NULL, $parent = NULL) {
// Get active item
foreach ($tree as $leaf) {
if ($leaf->inActiveTrail) {
$active_item = $leaf;
break;
}
}
// If the active item is set and has children
if (!empty($active_item) && !empty($active_item->subtree)) {
// run getCurrentParent with the parent ID as the $active_item ID.
return IntranetMenuTransformers::getCurrentParent($active_item->subtree, $parent, $active_item);
}
// If the active item is not set, we know there was no active item on this
// level therefore the active item parent is the previous level's parent
if (empty($active_item)) {
return $prev_parent;
}
// Otherwise, the current active item has no children to check, so it is
// the bottommost and its parent is the correct parent.
return $parent;
}
/**
* Remove the children from all MenuLinkTreeElements that aren't active. If
* it is active, remove its children's children.
*
* @param \Drupal\Core\Menu\MenuLinkTreeElement[] $tree
* The menu links to strip children from non-active leafs.
*
* @return \Drupal\Core\Menu\MenuLinkTreeElement[]
* A menu tree with no children of non-active leafs.
*/
private function stripChildren($tree) {
// For each item in the tree, if the item isn't active, strip its children
// and return the tree.
foreach ($tree as &$leaf) {
// Check if active and if has children
if ($leaf->inActiveTrail && !empty($leaf->subtree)) {
// Then recurse on the children.
$leaf->subtree = IntranetMenuTransformers::stripChildren($leaf->subtree);
}
// Otherwise, if not the active menu
elseif (!$leaf->inActiveTrail) {
// Otherwise, it's not active, so we don't want to display any children
// so strip them.
$leaf->subtree = array();
}
}
return $tree;
}
Est-ce la meilleure façon de le faire? Probablement pas. Mais cela fournit au moins un point de départ pour les personnes qui ont besoin de faire quelque chose de similaire.