CMB2 - Classe para criar uma galeria padrão, usando CMB2

Gallery.php

<?php

namespace OOPFunctions\MetaBoxes\Gallery;

if ( !class_exists('\OOPFunctions\MetaBoxes\Gallery\Gallery') ) {

	/**
	 * Description of Gallery
	 *
	 * @author Pablo Pacheco <pablo.pacheco@origgami.com.br>
	 */
	class Gallery {

		private $id = 'gallerycmb';

		/**
		 *
		 * @var Metas
		 */
		private $metas;

		public function __construct() {
			$this->setMetas(new Metas());
			add_action('cmb2_admin_init', array($this, 'addCmb'));
		}

		public function addCmb() {
			/**
			 * Sample metabox to demonstrate each field type included
			 */
			$cmb_demo = new_cmb2_box(array(
				'id'			 => $this->getId(),
				'title'			 => __('Galeria', 'cmb2'),
				'object_types'	 => array('page',), // Post type
				'show_on'		 => array('key' => 'page-template', 'value' => 'page-templates/santo-gostinho.php'),
			));

			$cmb_demo->add_field(array(
				//'name'		 => __('Test Text', 'cmb2'),
				//'desc'		 => __('field description (optional)', 'cmb2'),
				'id'			 => $this->getMetas()->fileList,
				'type'			 => 'file_list',
				'preview_size'	 => array(130, 130), // Default: array( 50, 50 )
			));
		}

		function getId() {
			return $this->id;
		}

		function getMetas() {
			return $this->metas;
		}

		function setId( $id ) {
			$this->id = $id;
		}

		function setMetas( Metas $metas ) {
			$this->metas = $metas;
		}

	}

	class Metas {

		public $fileList = 'gal_filelist';

	}

}