public function __construct() {

		// Filter menu items on frontend to add real URLs to menu items.
		add_filter( 'wp_nav_menu_objects', array( $this, 'filter_nav_items' ) );

		// Add meta box to the Appearance -> Menus screen on admin panel.
		add_action( 'load-nav-menus.php', array( $this, 'add_metabox' ) );

		// Add LifterLMS menu item type section to customizer.
		add_filter( 'customize_nav_menu_available_item_types', array( $this, 'customize_add_type' ) );

		// Add LifterLMS menu items links to the customizer.
		add_filter( 'customize_nav_menu_available_items', array( $this, 'customize_add_items' ), 10, 4 );

		// Add active classes for nav items for catalog pages.
		add_filter( 'wp_nav_menu_objects', array( $this, 'menu_item_classes' ) );

	}