/**
  * Modify shortcode fieldsets
  */
 public function shortcode_fieldsets($fieldsets)
 {
     if (!isset($fieldsets['auto']) && class_exists('Youxi_Form')) {
         $fieldsets['auto'] = Youxi_Form::auto_fieldset();
     }
     $animation_fieldset = apply_filters('youxi_shortcode_animation_fieldset', 'animation');
     if (!isset($fieldsets[$animation_fieldset])) {
         $fieldsets[$animation_fieldset] = apply_filters('youxi_shortcode_animation_fieldset', array('id' => 'animation', 'title' => __('Animation', 'youxi')));
     }
     return $fieldsets;
 }