Class to slide a route horizontal from right to left.

horizontal_sliding_page_route.dart

class HorizontalSlidingPageRoute<T> extends MaterialPageRoute<T> {
  HorizontalSlidingPageRoute({
    WidgetBuilder builder,
    RouteSettings settings: const RouteSettings(),
    maintainState: true,
  })
    : super(builder: builder, settings: settings, maintainState: maintainState);

  @override
  Widget buildTransitions(BuildContext context, Animation<double> animation,
    Animation<double> forwardAnimation, Widget child) {
    return new SlideTransition(
      position: new FractionalOffsetTween(
        begin: FractionalOffset.topRight,
        end: FractionalOffset.topLeft
      ).animate(animation),
      child: child,
    );
  }
}