flutter_login2/lib/pages/background.dart

import 'package:flutter/material.dart';

/// Description: background for login and register page
/// Time       : 08/24/2023 Thursday
/// Author     : liuyuqi.gov@msn.cn
class Background extends StatelessWidget {
  
  final Widget child;
  final String topImg, bottomImg;

  const Background(
      {super.key,
      required this.child,
      this.topImg = "assets/images/main_top.png",
      this.bottomImg = "assets/images/main_bottom.png"});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      resizeToAvoidBottomInset: false,
      body: SizedBox(
        // color: Colors.green,
        width: double.infinity,
        height: MediaQuery.of(context).size.height,
        child: Stack(
          alignment: Alignment.center,
          // alignment: Alignment.topCenter,
          children: [
            Positioned(
                top: 0,
                left: 0,
                child: Image.asset(
                  topImg,
                  width: 120,
                )),
            // Positioned(
            //     bottom: 0,
            //     right: 0,
            //     child: Image.asset(
            //       bottomImg,
            //       width: 120,
            //     )),
            SafeArea(
                child: Container(
              margin: const EdgeInsets.only(left: 20, right: 20),
              child: child,
            ))
          ],
        ),
      ),
    );
  }
}