/**
  * Call the registered {@code PageProviderChangedListener}, if any, to notify that the page
  * provider has refreshed.
  *
  * @since 5.7
  */
 protected void notifyRefresh() {
   if (pageProviderChangedListener != null) {
     pageProviderChangedListener.refreshed(this);
   }
 }
 /**
  * Call the registered {@code PageProviderChangedListener}, if any, to notify that the page
  * provider current page has changed.
  *
  * @since 5.7
  */
 protected void notifyPageChanged() {
   if (pageProviderChangedListener != null) {
     pageProviderChangedListener.pageChanged(this);
   }
 }