/**
  * Main Pootle page builder Photography add on Instance
  * Ensures only one instance of Storefront_Extension_Boilerplate is loaded or can be loaded.
  * @since 1.0.0
  * @return page_builder_photo_addon_Public instance
  */
 public static function instance()
 {
     if (null == self::$_instance) {
         self::$_instance = new self();
     }
     return self::$_instance;
 }
 /**
  * Initiates public class and adds public hooks
  * @since 1.0.0
  */
 private function _public()
 {
     //Instantiating public class
     $this->public = page_builder_photo_addon_Public::instance();
     //Adding front end JS and CSS in /assets folder
     add_action('wp_enqueue_scripts', array($this->public, 'enqueue'));
     //Add/Modify row html attributes
     add_filter('pootlepb_row_style_attributes', array($this->public, 'row_attr'), 10, 2);
     //Checking for slider/gallery setting
     add_action('pootlepb_render_content_block', array($this->public, 'gallery_or_slider'), 52);
 }