class AlterSinglePageSiteOutput in Single Page Site 8

Class AlterSinglePageSiteOutput.

@package Drupal\single_page_site_newt_page\EventSubscriber

Hierarchy

• class \Drupal\single_page_site_next_page\EventSubscriber\AlterSinglePageSiteOutput implements \Symfony\Component\EventDispatcher\EventSubscriberInterface

1 string reference to 'AlterSinglePageSiteOutput'

single_page_site_next_page.services.yml in modules/single_page_site_next_page/single_page_site_next_page.services.yml

modules/single_page_site_next_page/single_page_site_next_page.services.yml

1 service uses AlterSinglePageSiteOutput

single_page_site_next_page.alter_output in modules/single_page_site_next_page/single_page_site_next_page.services.yml

Drupal\single_page_site_next_page\EventSubscriber\AlterSinglePageSiteOutput

File

modules/single_page_site_next_page/src/EventSubscriber/AlterSinglePageSiteOutput.php, line 17

Namespace

Drupal\single_page_site_next_page\EventSubscriber

class AlterSinglePageSiteOutput implements EventSubscriberInterface {
  protected $manager;
  protected $menuItems;

  /**
   * AlterSinglePageSiteOutput constructor.
   */
  public function __construct(SinglePageSiteManager $manager) {
    $this->manager = $manager;
    $this->menuItems = $this
      ->setSinglePageItems();
  }

  /**
   * Alters the output of the single page item.
   *
   * @param \Drupal\single_page_site\Event\EventSinglePageSiteAlterOutput $event
   *   Event value.
   */
  public function alterOutput(EventSinglePageSiteAlterOutput $event) {
    $output = $event
      ->getOutput();
    $current_item = $event
      ->getCurrentItemCount();
    $count_menu_items = count($this->menuItems);

    // If item is not last item.
    if ($current_item < $count_menu_items) {
      $menu_item = $this->menuItems[$current_item];

      // Get route params.
      $params = $menu_item['route_parameters'];

      // Fetch href.
      $href = Url::fromRoute($menu_item['route_name'], $params)
        ->toString();

      // Generate valid anchor.
      $anchor = $this->manager
        ->generateAnchor($href);

      // Generate next url.
      // (I know this is bad practice, but I haven't figured out yet how to
      // render a link with only a fragment and no URL).
      $next_page_link = '<a href="#' . $anchor . '" class="to-next-page">' . $menu_item['title'] . '</a>';

      // Attach link to output by creating new markup object.
      $event
        ->setOutput(Markup::create($output . $next_page_link));
    }
  }

  /**
   * Sets single page items (from menu tree).
   *
   * @return array
   *   Return array with items.
   */
  private function setSinglePageItems() {
    $items =& drupal_static(__FUNCTION__);
    if (!isset($items)) {
      $items = array();
      $tree = $this->manager
        ->getMenuChildren();
      foreach ($tree as $menu_item) {
        if ($menu_item_details = $this->manager
          ->isMenuItemRenderable($menu_item)) {
          array_push($items, $menu_item_details);
        }
      }
    }
    return $items;
  }

  /**
   * Function to get Subscribed Events.
   *
   * @inheritdoc
   */
  public static function getSubscribedEvents() {
    return [
      SinglePageSiteEvents::SINGLE_PAGE_SITE_ALTER_OUTPUT => [
        [
          'alterOutput',
        ],
      ],
    ];
  }

}

Members

Name	Modifiers	Type	Description	Overrides
AlterSinglePageSiteOutput::$manager	protected	property
AlterSinglePageSiteOutput::$menuItems	protected	property
AlterSinglePageSiteOutput::alterOutput	public	function	Alters the output of the single page item.
AlterSinglePageSiteOutput::getSubscribedEvents	public static	function	Function to get Subscribed Events.
AlterSinglePageSiteOutput::setSinglePageItems	private	function	Sets single page items (from menu tree).
AlterSinglePageSiteOutput::__construct	public	function	AlterSinglePageSiteOutput constructor.