import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';

class GradientAppBar extends StatefulWidget implements PreferredSizeWidget{
  GradientAppBar({
  }):preferredSize = Size.fromHeight(kToolbarHeight);

 @override
  _GradientAppBarState createState() => _GradientAppBarState();

  @override
  final Size preferredSize;
}

class _GradientAppBarState extends State<GradientAppBar> {
  static const double _defaultElevation = 4.0;

  @override
  Widget build(BuildContext context) {
    Container();
  }
 }