1. 8.5.x core/modules/system/src/Plugin/Block/SystemMenuBlock.php SystemMenuBlock
  2. 8.5.x core/modules/system/src/Plugin/Derivative/SystemMenuBlock.php SystemMenuBlock
  3. 8.0.x core/modules/system/src/Plugin/Derivative/SystemMenuBlock.php SystemMenuBlock
  4. 8.0.x core/modules/system/src/Plugin/Block/SystemMenuBlock.php SystemMenuBlock
  5. 8.1.x core/modules/system/src/Plugin/Block/SystemMenuBlock.php SystemMenuBlock
  6. 8.1.x core/modules/system/src/Plugin/Derivative/SystemMenuBlock.php SystemMenuBlock
  7. 8.2.x core/modules/system/src/Plugin/Block/SystemMenuBlock.php SystemMenuBlock
  8. 8.2.x core/modules/system/src/Plugin/Derivative/SystemMenuBlock.php SystemMenuBlock
  9. 8.3.x core/modules/system/src/Plugin/Block/SystemMenuBlock.php SystemMenuBlock
  10. 8.3.x core/modules/system/src/Plugin/Derivative/SystemMenuBlock.php SystemMenuBlock
  11. 8.4.x core/modules/system/src/Plugin/Block/SystemMenuBlock.php SystemMenuBlock
  12. 8.4.x core/modules/system/src/Plugin/Derivative/SystemMenuBlock.php SystemMenuBlock
  13. 8.6.x core/modules/system/src/Plugin/Derivative/SystemMenuBlock.php SystemMenuBlock
  14. 8.6.x core/modules/system/src/Plugin/Block/SystemMenuBlock.php SystemMenuBlock

Provides a generic Menu block.

Plugin annotation

  id = "system_menu_block",
  admin_label = @Translation("Menu"),
  category = @Translation("Menus"),
  deriver = "Drupal\system\Plugin\Derivative\SystemMenuBlock"


Expanded class hierarchy of SystemMenuBlock


core/modules/system/src/Plugin/Block/SystemMenuBlock.php, line 23


View source
class SystemMenuBlock extends BlockBase implements ContainerFactoryPluginInterface {

   * The menu link tree service.
   * @var \Drupal\Core\Menu\MenuLinkTreeInterface
  protected $menuTree;

   * The active menu trail service.
   * @var \Drupal\Core\Menu\MenuActiveTrailInterface
  protected $menuActiveTrail;

   * Constructs a new SystemMenuBlock.
   * @param array $configuration
   *   A configuration array containing information about the plugin instance.
   * @param string $plugin_id
   *   The plugin_id for the plugin instance.
   * @param array $plugin_definition
   *   The plugin implementation definition.
   * @param \Drupal\Core\Menu\MenuLinkTreeInterface $menu_tree
   *   The menu tree service.
   * @param \Drupal\Core\Menu\MenuActiveTrailInterface $menu_active_trail
   *   The active menu trail service.
  public function __construct(array $configuration, $plugin_id, $plugin_definition, MenuLinkTreeInterface $menu_tree, MenuActiveTrailInterface $menu_active_trail) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
    $this->menuTree = $menu_tree;
    $this->menuActiveTrail = $menu_active_trail;

   * {@inheritdoc}
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    return new static($configuration, $plugin_id, $plugin_definition, $container
      ->get('menu.link_tree'), $container

   * {@inheritdoc}
  public function blockForm($form, FormStateInterface $form_state) {
    $config = $this->configuration;
    $defaults = $this
    $form['menu_levels'] = [
      '#type' => 'details',
      '#title' => $this
        ->t('Menu levels'),
      // Open if not set to defaults.
      '#open' => $defaults['level'] !== $config['level'] || $defaults['depth'] !== $config['depth'],
      '#process' => [
    $options = range(0, $this->menuTree
    $form['menu_levels']['level'] = [
      '#type' => 'select',
      '#title' => $this
        ->t('Initial visibility level'),
      '#default_value' => $config['level'],
      '#options' => $options,
      '#description' => $this
        ->t('The menu is only visible if the menu item for the current page is at this level or below it. Use level 1 to always display this menu.'),
      '#required' => TRUE,
    $options[0] = $this
    $form['menu_levels']['depth'] = [
      '#type' => 'select',
      '#title' => $this
        ->t('Number of levels to display'),
      '#default_value' => $config['depth'],
      '#options' => $options,
      '#description' => $this
        ->t('This maximum number includes the initial level.'),
      '#required' => TRUE,
    return $form;

   * Form API callback: Processes the menu_levels field element.
   * Adjusts the #parents of menu_levels to save its children at the top level.
  public static function processMenuLevelParents(&$element, FormStateInterface $form_state, &$complete_form) {
    return $element;

   * {@inheritdoc}
  public function blockSubmit($form, FormStateInterface $form_state) {
    $this->configuration['level'] = $form_state
    $this->configuration['depth'] = $form_state

   * {@inheritdoc}
  public function build() {
    $menu_name = $this
    $parameters = $this->menuTree

    // Adjust the menu tree parameters based on the block's configuration.
    $level = $this->configuration['level'];
    $depth = $this->configuration['depth'];

    // 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 ($depth > 0) {
        ->setMaxDepth(min($level + $depth - 1, $this->menuTree

    // For menu blocks with start level greater than 1, only show menu items
    // from the current active trail. Adjust the root according to the current
    // position in the menu in order to determine if we can show the subtree.
    if ($level > 1) {
      if (count($parameters->activeTrail) >= $level) {

        // Active trail array is child-first. Reverse it, and pull the new menu
        // root based on the parent of the configured start level.
        $menu_trail_ids = array_reverse(array_values($parameters->activeTrail));
        $menu_root = $menu_trail_ids[$level - 1];
        if ($depth > 0) {
            ->setMaxDepth(min($level - 1 + $depth - 1, $this->menuTree
      else {
        return [];
    $tree = $this->menuTree
      ->load($menu_name, $parameters);
    $manipulators = [
        'callable' => 'menu.default_tree_manipulators:checkAccess',
        'callable' => 'menu.default_tree_manipulators:generateIndexAndSort',
    $tree = $this->menuTree
      ->transform($tree, $manipulators);
    return $this->menuTree

   * {@inheritdoc}
  public function defaultConfiguration() {
    return [
      'level' => 1,
      'depth' => 0,

   * {@inheritdoc}
  public function getCacheTags() {

    // Even when the menu block renders to the empty string for a user, we want
    // the cache tag for this menu to be set: whenever the menu is changed, this
    // menu block must also be re-rendered for that user, because maybe a menu
    // link that is accessible for that user has been added.
    $cache_tags = parent::getCacheTags();
    $cache_tags[] = 'config:system.menu.' . $this
    return $cache_tags;

   * {@inheritdoc}
  public function getCacheContexts() {

    // ::build() uses MenuLinkTreeInterface::getCurrentRouteMenuTreeParameters()
    // to generate menu tree parameters, and those take the active menu trail
    // into account. Therefore, we must vary the rendered menu by the active
    // trail of the rendered menu.
    // Additional cache contexts, e.g. those that determine link text or
    // accessibility of a menu, will be bubbled automatically.
    $menu_name = $this
    return Cache::mergeContexts(parent::getCacheContexts(), [
      'route.menu_active_trails:' . $menu_name,



Contains filters are case sensitive
Namesort descending Modifiers Type Description Overrides
BlockBase::$transliteration protected property The transliteration service.
BlockBase::access public function Indicates whether the block should be shown. Overrides BlockPluginInterface::access
BlockBase::baseConfigurationDefaults protected function Returns generic default configuration for block plugins.
BlockBase::blockAccess protected function Indicates whether the block should be shown.
BlockBase::blockValidate public function Adds block type-specific validation for the block form. Overrides BlockPluginInterface::blockValidate
BlockBase::buildConfigurationForm public function Creates a generic configuration form for all block types. Individual block plugins can add elements to this form by overriding BlockBase::blockForm(). Most block plugins should not override this method unless they need to alter the generic form elements. Overrides PluginFormInterface::buildConfigurationForm
BlockBase::calculateDependencies public function Calculates dependencies for the configured plugin. Overrides DependentPluginInterface::calculateDependencies
BlockBase::getConfiguration public function Gets this plugin's configuration. Overrides ConfigurablePluginInterface::getConfiguration
BlockBase::getMachineNameSuggestion public function Suggests a machine name to identify an instance of this block. Overrides BlockPluginInterface::getMachineNameSuggestion
BlockBase::label public function Returns the user-facing block label. Overrides BlockPluginInterface::label
BlockBase::setConfiguration public function Sets the configuration for this plugin instance. Overrides ConfigurablePluginInterface::setConfiguration
BlockBase::setConfigurationValue public function Sets a particular value in the block settings. Overrides BlockPluginInterface::setConfigurationValue
BlockBase::setTransliteration public function Sets the transliteration service.
BlockBase::submitConfigurationForm public function Most block plugins should not override this method. To add submission handling for a specific block type, override BlockBase::blockSubmit(). Overrides PluginFormInterface::submitConfigurationForm
BlockBase::transliteration protected function Wraps the transliteration service.
BlockBase::validateConfigurationForm public function Most block plugins should not override this method. To add validation for a specific block type, override BlockBase::blockValidate(). Overrides PluginFormInterface::validateConfigurationForm
BlockPluginInterface::BLOCK_LABEL_VISIBLE constant Indicates the block label (title) should be displayed to end users.
ContextAwarePluginAssignmentTrait::addContextAssignmentElement protected function Builds a form element for assigning a context to a given slot.
ContextAwarePluginAssignmentTrait::contextHandler protected function Wraps the context handler. Overrides ContextAwarePluginBase::contextHandler
ContextAwarePluginAssignmentTrait::t abstract protected function Ensures the t() method is available. Overrides StringTranslationTrait::t
ContextAwarePluginBase::$context protected property The data objects representing the context of this plugin.
ContextAwarePluginBase::createContextFromConfiguration protected function Overrides ContextAwarePluginBase::createContextFromConfiguration
ContextAwarePluginBase::getCacheMaxAge public function The maximum age for which this object may be cached. Overrides CacheableDependencyInterface::getCacheMaxAge
ContextAwarePluginBase::getContext public function This code is identical to the Component in order to pick up a different Context class. Overrides ContextAwarePluginBase::getContext
ContextAwarePluginBase::getContextDefinition public function Overrides ContextAwarePluginBase::getContextDefinition
ContextAwarePluginBase::getContextDefinitions public function Overrides ContextAwarePluginBase::getContextDefinitions
ContextAwarePluginBase::getContextMapping public function Gets a mapping of the expected assignment names to their context names. Overrides ContextAwarePluginInterface::getContextMapping
ContextAwarePluginBase::getContexts public function Gets the defined contexts. Overrides ContextAwarePluginInterface::getContexts
ContextAwarePluginBase::getContextValue public function Gets the value for a defined context. Overrides ContextAwarePluginInterface::getContextValue
ContextAwarePluginBase::getContextValues public function Gets the values for all defined contexts. Overrides ContextAwarePluginInterface::getContextValues
ContextAwarePluginBase::setContext public function Set a context on this plugin. Overrides ContextAwarePluginBase::setContext
ContextAwarePluginBase::setContextMapping public function Sets a mapping of the expected assignment names to their context names. Overrides ContextAwarePluginInterface::setContextMapping
ContextAwarePluginBase::setContextValue public function Sets the value for a defined context. Overrides ContextAwarePluginBase::setContextValue
ContextAwarePluginBase::validateContexts public function Validates the set values for the defined contexts. Overrides ContextAwarePluginInterface::validateContexts
DependencySerializationTrait::$_serviceIds protected property An array of service IDs keyed by property name used for serialization.
DependencySerializationTrait::__sleep public function Prevents serializing any properties.
DependencySerializationTrait::__wakeup public function
PluginBase::$configuration protected property Configuration information passed into the plugin.
PluginBase::$pluginDefinition protected property The plugin implementation definition.
PluginBase::$pluginId protected property The plugin_id.
PluginBase::DERIVATIVE_SEPARATOR constant A string which is used to separate base plugin IDs from the derivative ID.
PluginBase::getBaseId public function Gets the base_plugin_id of the plugin instance. Overrides DerivativeInspectionInterface::getBaseId
PluginBase::getDerivativeId public function Gets the derivative_id of the plugin instance. Overrides DerivativeInspectionInterface::getDerivativeId
PluginBase::getPluginDefinition public function Gets the definition of the plugin implementation. Overrides PluginInspectionInterface::getPluginDefinition
PluginBase::getPluginId public function Gets the plugin_id of the plugin instance. Overrides PluginInspectionInterface::getPluginId
PluginWithFormsTrait::getFormClass public function Gets the form class for the given operation. Overrides PluginWithFormsInterface::getFormClass
PluginWithFormsTrait::hasFormClass public function Gets whether the plugin has a form class for the given operation. Overrides PluginWithFormsInterface::hasFormClass
StringTranslationTrait::$stringTranslation protected property The string translation service.
StringTranslationTrait::formatPlural protected function Formats a string containing a count of items.
StringTranslationTrait::getNumberOfPlurals protected function Returns the number of plurals supported by a given language.
StringTranslationTrait::getStringTranslation protected function Gets the string translation service.
StringTranslationTrait::setStringTranslation public function Sets the string translation service to use.
SystemMenuBlock::$menuActiveTrail protected property The active menu trail service.
SystemMenuBlock::$menuTree protected property The menu link tree service.
SystemMenuBlock::blockForm public function Returns the configuration form elements specific to this block plugin. Overrides BlockBase::blockForm
SystemMenuBlock::blockSubmit public function Adds block type-specific submission handling for the block form. Overrides BlockBase::blockSubmit
SystemMenuBlock::build public function Builds and returns the renderable array for this block plugin. Overrides BlockPluginInterface::build
SystemMenuBlock::create public static function Creates an instance of the plugin. Overrides ContainerFactoryPluginInterface::create
SystemMenuBlock::defaultConfiguration public function Gets default configuration for this plugin. Overrides BlockBase::defaultConfiguration
SystemMenuBlock::getCacheContexts public function The cache contexts associated with this object. Overrides ContextAwarePluginBase::getCacheContexts
SystemMenuBlock::getCacheTags public function The cache tags associated with this object. Overrides ContextAwarePluginBase::getCacheTags
SystemMenuBlock::processMenuLevelParents public static function Form API callback: Processes the menu_levels field element.
SystemMenuBlock::__construct public function Constructs a new SystemMenuBlock. Overrides BlockBase::__construct
TypedDataTrait::$typedDataManager protected property The typed data manager used for creating the data types.
TypedDataTrait::getTypedDataManager public function Gets the typed data manager.
TypedDataTrait::setTypedDataManager public function Sets the typed data manager.