presentation method

Override to further define how the main body, background and foreground are presented

Tip: This is useful for showing or hiding the body content from the user or displaying loading indicators while the body content is being loaded.

Example:

@override
Widget presentation(
  BuildContext context,
  Widget body,
  Widget background,
  Widget foreground,
) {
  return PodBuilder(
    pod: this._pIsLoading,
    builder: (context, background, isLoading) {
      if (isLoading) {
        return WStack(
          children: [
            background,
            const CircularProgressIndicator(),
          ],
        );
      } else {
        return WStack(
         children: [
            background,
            body,
            foreground,
         ],
        );
      }
    },
    child: background,
  );
}