GroupMenuBlock.php in Group Content Menu 8

Namespace

Drupal\group_content_menu\Plugin\Block

File

src/Plugin/Block/GroupMenuBlock.php

<?php

namespace Drupal\group_content_menu\Plugin\Block;

use Drupal\Core\Block\BlockBase;
use Drupal\Core\Cache\Cache;
use Drupal\Core\Entity\EntityTypeManagerInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Menu\MenuActiveTrailInterface;
use Drupal\Core\Menu\MenuLinkTreeInterface;
use Drupal\Core\Menu\MenuTreeParameters;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\group_content_menu\GroupContentMenuInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides a generic Menu block.
 *
 * @Block(
 *   id = "group_content_menu",
 *   admin_label = @Translation("Group Menu"),
 *   category = @Translation("Group Menus"),
 *   deriver = "Drupal\group_content_menu\Plugin\Derivative\GroupMenuBlock",
 *   context_definitions = {
 *     "group" = @ContextDefinition("entity:group", required = FALSE)
 *   }
 * )
 */
class GroupMenuBlock extends BlockBase implements ContainerFactoryPluginInterface {

  /**
   * The menu name.
   *
   * @var string
   */
  protected $menuName;

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

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

  /**
   * The entity type manager service.
   *
   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
   */
  protected $entityTypeManager;

  /**
   * GroupMenuBlock constructor.
   *
   * @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.
   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
   *   The entity type manager.
   */
  public function __construct(array $configuration, $plugin_id, array $plugin_definition, MenuLinkTreeInterface $menu_tree, MenuActiveTrailInterface $menu_active_trail, EntityTypeManagerInterface $entity_type_manager) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
    $this->menuTree = $menu_tree;
    $this->menuActiveTrail = $menu_active_trail;
    $this->entityTypeManager = $entity_type_manager;
  }

  /**
   * {@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
      ->get('menu.active_trail'), $container
      ->get('entity_type.manager'));
  }

  /**
   * {@inheritdoc}
   */
  public function blockForm($form, FormStateInterface $form_state) {
    $config = $this->configuration;
    $defaults = $this
      ->defaultConfiguration();
    $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' => [
        [
          get_class(),
          'processMenuLevelParents',
        ],
      ],
    ];
    $options = range(0, $this->menuTree
      ->maxDepth());
    unset($options[0]);
    $form['menu_levels']['level'] = [
      '#type' => 'select',
      '#title' => $this
        ->t('Initial menu level'),
      '#default_value' => $config['level'],
      '#options' => $options,
      '#description' => $this
        ->t('The menu will only be visible if the menu item for the current page is at or below the selected starting level. Select level 1 to always keep this menu visible.'),
      '#required' => TRUE,
    ];
    $options[0] = $this
      ->t('Unlimited');
    $form['menu_levels']['depth'] = [
      '#type' => 'select',
      '#title' => $this
        ->t('Maximum number of menu levels to display'),
      '#default_value' => $config['depth'],
      '#options' => $options,
      '#description' => $this
        ->t('The maximum number of menu levels to show, starting from the initial menu level. For example: with an initial level 2 and a maximum number of 3, menu levels 2, 3 and 4 can be displayed.'),
      '#required' => TRUE,
    ];
    $form['menu_levels']['expand_all_items'] = [
      '#type' => 'checkbox',
      '#title' => $this
        ->t('Expand all menu items'),
      '#default_value' => !empty($config['expand_all_items']),
      '#description' => $this
        ->t('Override the option found on each menu link used for expanding children and instead display the whole menu tree as expanded.'),
    ];
    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) {
    array_pop($element['#parents']);
    return $element;
  }

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

  /**
   * {@inheritdoc}
   */
  public function build() {
    $menu_name = $this
      ->getMenuName();

    // If unable to determine the menu, prevent the block from rendering.
    if (!($menu_name = $this
      ->getMenuName())) {
      return [];
    }
    if ($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) {
      $parameters
        ->setMaxDepth(min($level + $depth - 1, $this->menuTree
        ->maxDepth()));
    }
    $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);
    $build = $this->menuTree
      ->build($tree);
    $menu_instance = $this
      ->getMenuInstance();
    if ($menu_instance instanceof GroupContentMenuInterface) {
      $build['#contextual_links']['group_menu'] = [
        'route_parameters' => [
          'group' => $this
            ->getContext('group')
            ->getContextData()
            ->getValue()
            ->id(),
          'group_content_menu' => $menu_instance
            ->id(),
        ],
      ];
    }
    if ($menu_instance) {
      $build['#theme'] = 'menu__group_menu';
    }
    return $build;
  }

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

  /**
   * {@inheritdoc}
   */
  public function getCacheTags() {
    $tags = parent::getCacheTags();
    if ($menu_name = $this
      ->getMenuName()) {
      return Cache::mergeTags($tags, [
        $menu_name,
      ]);
    }
    return $tags;
  }

  /**
   * {@inheritdoc}
   */
  public function getCacheContexts() {
    $tags = [
      // We use 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.
      'route.menu_active_trails:group-menu-' . $this
        ->getDerivativeId(),
      // We also vary by the active group as found by RouteGroupCacheContext.
      'route.group',
    ];
    return Cache::mergeContexts(parent::getCacheContexts(), $tags);
  }

  /**
   * Gets the menu instance for the current group.
   *
   * @return \Drupal\group_content_menu\GroupContentMenuInterface|null
   *   The instance of the menu or null if no instance is found.
   *
   * @throws \Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException
   * @throws \Drupal\Component\Plugin\Exception\PluginException
   * @throws \Drupal\Component\Plugin\Exception\PluginNotFoundException
   */
  public function getMenuInstance() {
    $entity = $this
      ->getContext('group')
      ->getContextData()
      ->getValue();

    // Don't load menu for group entities that are new/unsaved.
    if (!$entity || $entity
      ->isNew()) {
      return NULL;
    }

    /** @var \Drupal\group\Entity\Storage\GroupContentStorage $groupStorage */
    $groupStorage = $this->entityTypeManager
      ->getStorage('group_content');
    $contentPluginId = $groupStorage
      ->loadByContentPluginId($this
      ->getPluginId());
    if (empty($contentPluginId)) {
      return NULL;
    }
    $instances = $groupStorage
      ->loadByGroup($entity, $this
      ->getPluginId());
    if ($instances) {
      return array_pop($instances)
        ->getEntity();
    }
    return NULL;
  }

  /**
   * Returns a name for the menu.
   *
   * @return string
   *   The name of the menu.
   *
   * @throws \Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException
   * @throws \Drupal\Component\Plugin\Exception\PluginException
   * @throws \Drupal\Component\Plugin\Exception\PluginNotFoundException
   */
  public function getMenuName() {
    if (isset($this->menuName)) {
      return $this->menuName;
    }
    $instance = $this
      ->getMenuInstance();
    if ($instance) {
      $this->menuName = GroupContentMenuInterface::MENU_PREFIX . $instance
        ->id();
    }
    return $this->menuName;
  }

}

Classes

Name	Description
GroupMenuBlock	Provides a generic Menu block.