singleton. * * @since 2.0 */ private function __construct() { if ( is_admin() ) { add_action( 'widgets_admin_page', array( $this, 'widget_sidebar_content' ) ); add_action( 'admin_head-widgets.php', array( $this, 'init_admin_head' ) ); } add_action( 'widgets_admin_page', array( $this, 'add_div_start' ) ); add_action( 'sidebar_admin_page', array( $this, 'add_div_end' ) ); } public function add_div_start() { echo '

'; } public function add_div_end() { echo '

'; } /** * Adds the additional HTML code to the widgets section. */ public function widget_sidebar_content() { include CSB_VIEWS_DIR . 'widgets.php'; } /** * Initialize the admin-head for the widgets page. * * @since 2.0.9.7 */ public function init_admin_head( $classes ) { add_filter( 'admin_body_class', array( $this, 'admin_body_class' ) ); } /** * Add a class to the body tag. * * @since 2.0.9.7 */ public function admin_body_class( $classes ) { $classes .= ' no-auto-init '; return $classes; } };