lateral_navigator_page_route.dart

class LateralNavigationPageRoute<T> extends MaterialPageRoute<T> {
  LateralNavigationPageRoute({
    required WidgetBuilder builder,
    RouteSettings? settings,
  }) : super(builder: builder, settings: settings);

  @override
  Widget buildTransitions(BuildContext context, Animation<double> animation,
          Animation<double> secondaryAnimation, Widget child) =>
      SlideTransition(
        position: Tween<Offset>(
          begin: const Offset(1, 0),
          end: Offset.zero,
        ).animate(animation),
        child: SlideTransition(
          position: Tween<Offset>(
            end: const Offset(-1, 0),
            begin: Offset.zero,
          ).animate(secondaryAnimation),
          child: child,
        ),
      );
}