flutter 装饰盒子，边框，圆角，阴影，形状，渐变，背景

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

class mydemo extends StatelessWidget {   // const mydemo({super.key});     @override   Widget build(BuildContext context) {     return Container(       //color: Colors.red,       decoration: BoxDecoration(           image: DecorationImage(               image: NetworkImage(                   'https://scpic2.chinaz.net/Files/pic/pic9/202205/apic41182_s.jpg'),               alignment: Alignment.topCenter,               repeat: ImageRepeat.repeat,               fit: BoxFit.cover,               colorFilter: ColorFilter.mode(                   Colors.indigoAccent.withOpacity(0.5), BlendMode.hardLight))),       child: Row(         mainAxisAlignment: MainAxisAlignment.center,         children: [           Container(               child: Icon(Icons.pool, size: 32.0, color: Colors.white),               //color: Color.fromRGBO(3, 54, 255, 1.0),               //padding: EdgeInsets.all(16.0),               margin: EdgeInsets.all(8.0),               width: 90.0,               height: 90.0,               decoration: BoxDecoration(                   color: Color.fromRGBO(3, 54, 255, 1.0),                   //borderRadius: BorderRadius.circular(16.0),                   // borderRadius: BorderRadius.only(                   //     topLeft: Radius.circular(18.0),                   //     bottomLeft: Radius.circular(18.0)),                   border: Border.all(                     color: Colors.white,                     width: 1.0,                   ),                   boxShadow: [                     BoxShadow(                       offset: Offset(5.0, 5.0),                       color: Colors.blueAccent,                       blurRadius: 2.0, //模糊程度                       spreadRadius: 2.0, //扩散，整数变大                     )                   ],                   shape: BoxShape.circle, //不能与borderRadius同时存在                   gradient:                       //RadialGradient(colors: [Colors.green, Colors.white]), //镜像渐变                       LinearGradient(                           colors: [Colors.green, Colors.white],                           begin: Alignment.topCenter) //线性渐变                   ))         ],       ),     );   } }