flutter BoxDecoration装饰基础

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      title: "BoxDecoration装饰基础",
      home: Scaffold(
        appBar: AppBar(
          title: Text('BoxDecoration装饰基础'),
        ),
        body: Center(
            child: Opacity(
          //设置透明度
          opacity: 0.8,
          child: Container(
            width: 200,
            height: 200,
            //装饰盒子
            decoration: BoxDecoration(
                //背景色
                color: Colors.yellow,
                //背景图
                image: DecorationImage(
                    image: ExactAssetImage('images/1.jpeg'),
                    fit: BoxFit.fill //填充类型
                    ),

                //添加边框
                border: Border.all(color: Colors.grey, width: 4.0),
                //添加边框弧度
                borderRadius: BorderRadius.circular(30.0),

                //设置阴影效果
                boxShadow: <BoxShadow>[
                  BoxShadow(
                      color: Colors.red, //阴影颜色
                      blurRadius: 8.0, //模糊值
                      spreadRadius: 8.0, //扩展阴影半径
                      offset: Offset(-1.0, 1.0) //x和y方向的偏移量

                      ),
                ]),
          ),
        )),
      ),
    );
  }
}