getCurrentRouteMenuTreeParameters example

/** * {@inheritdoc} */
  public function build() {
    $menu_name = $this->getDerivativeId();
    if ($this->configuration['expand_all_items']) {
      $parameters = new MenuTreeParameters();
      $active_trail = $this->menuActiveTrail->getActiveTrailIds($menu_name);
      $parameters->setActiveTrail($active_trail);
    }
    else {
      $parameters = $this->menuTree->getCurrentRouteMenuTreeParameters($menu_name);
    }

    // Adjust the menu tree parameters based on the block's configuration.     $level = $this->configuration['level'];
    $depth = $this->configuration['depth'];
    $parameters->setMinDepth($level);
    // When the depth is configured to zero, there is no depth limit. When depth     // is non-zero, it indicates the number of levels that must be displayed.     // Hence this is a relative depth that we must convert to an actual     // (absolute) depth, that may never exceed the maximum depth.     if ($depth > 0) {