code: function() {
              if( !$log.is(':animated') ) {
                if( !$userListButton.hasClass(className.active) ) {
                  $userListButton
                    .addClass(className.active)
                  ;
                  module.user.list.show();
                }
                else {
                  $userListButton
                    .removeClass('active')
                  ;
                  module.user.list.hide();
                }
              }
  
            }
docs: handles button click on user list button