Flutter BoxShadow(绘制阴影)+Container+BoxDecoration

勿以善小而不为，勿以恶小而为之。——刘备

      

阴影(BoxShadow)+Y轴偏移量(Offset)

 

class _MyHomePageState extends State {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
        ),
        body: Container(
          padding: EdgeInsets.all(20.0),
          margin: EdgeInsets.all(20.0),
          decoration: new BoxDecoration(
            color: Colors.white,
            borderRadius: BorderRadius.all(Radius.circular(10.0)),
            border: new Border.all(width: 1, color: Colors.green,),
            boxShadow: [
              BoxShadow(
                  color: Colors.green,
                  offset: Offset(0.0, 6.0), //阴影y轴偏移量
                  blurRadius: 0, //阴影模糊程度
                  spreadRadius: 0 //阴影扩散程度
                  )
            ],
          ),
          child: Text("BoxShadow(绘制阴影)+Container+BoxDecoration"),
        ));
  }
}

 阴影(BoxShadow)+X轴偏移量(Offset)

     

 

class _MyHomePageState extends State {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
        ),
        body: Container(
          padding: EdgeInsets.all(20.0),
          margin: EdgeInsets.all(20.0),
          decoration: new BoxDecoration(
            color: Colors.white,
            borderRadius: BorderRadius.all(Radius.circular(10.0)),
            border: new Border.all(width: 1, color: Colors.black,),
            boxShadow: [
              BoxShadow(
                  color: Colors.black,
                  offset: Offset(6.0, 0.0), //阴影x轴偏移量
                  blurRadius: 0, //阴影模糊程度
                  spreadRadius: 0 //阴影扩散程度
                  )
            ],
          ),
          child: Text("BoxShadow(绘制阴影)+Container+BoxDecoration"),
        ));
  }
}

 阴影(BoxShadow)+XY轴偏移量(Offset)

      

class _MyHomePageState extends State {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
        ),
        body: Container(
          padding: EdgeInsets.all(20.0),
          margin: EdgeInsets.all(20.0),
          decoration: new BoxDecoration(
            color: Colors.white,
            borderRadius: BorderRadius.all(Radius.circular(10.0)),
            border: new Border.all(width: 1, color: Colors.green,),
            boxShadow: [
              BoxShadow(
                  color: Colors.green,
                  offset: Offset(6.0, 6.0), //阴影x轴偏移量
                  blurRadius: 0, //阴影模糊程度
                  spreadRadius: 0 //阴影扩散程度
                  )
            ],
          ),
          child: Text("BoxShadow(绘制阴影)+Container+BoxDecoration"),
        ));
  }
}

 阴影(BoxShadow)+XY轴偏移量(Offset) +模糊(blurRadius)

     

 

class _MyHomePageState extends State {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
        ),
        body: Container(
          padding: EdgeInsets.all(20.0),
          margin: EdgeInsets.all(20.0),
          decoration: new BoxDecoration(
            color: Colors.white,
            borderRadius: BorderRadius.all(Radius.circular(10.0)),
            border: new Border.all(width: 1, color: Colors.black,),
            boxShadow: [
              BoxShadow(
                  color: Colors.black,
                  offset: Offset(-6.0, 6.0), //阴影x轴偏移量
                  blurRadius: 10, //阴影模糊程度
                  spreadRadius: 0 //阴影扩散程度
                  )
            ],
          ),
          child: Text("BoxShadow(绘制阴影)+Container+BoxDecoration"),
        ));
  }
}

阴影(BoxShadow)+XY轴偏移量(Offset) +模糊(blurRadius)+扩散(spreadRadius) 

      

class _MyHomePageState extends State {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
        ),
        body: Container(
          padding: EdgeInsets.all(20.0),
          margin: EdgeInsets.all(20.0),
          decoration: new BoxDecoration(
            color: Colors.white,
            borderRadius: BorderRadius.all(Radius.circular(10.0)),
            border: new Border.all(width: 1, color: Colors.green,),
            boxShadow: [
              BoxShadow(
                  color: Colors.green,
                  offset: Offset(-6.0, 6.0), //阴影x轴偏移量
                  blurRadius: 10, //阴影模糊程度
                  spreadRadius: 10 //阴影扩散程度
                  )
            ],
          ),
          child: Text("BoxShadow(绘制阴影)+Container+BoxDecoration"),
        ));
  }
}

withOpacity淡化阴影

     

class _MyHomePageState extends State {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
        ),
        body: Container(
          padding: EdgeInsets.all(20.0),
          margin: EdgeInsets.all(20.0),
          decoration: new BoxDecoration(
            color: Colors.white,
            borderRadius: BorderRadius.all(Radius.circular(10.0)),
            border: new Border.all(width: 0, color: Colors.red,),
            boxShadow: [
              BoxShadow(
                  color: Colors.red.withOpacity(0.2),
                  offset: Offset(-6.0, 6.0), //阴影x轴偏移量
                  blurRadius: 10, //阴影模糊程度
                  spreadRadius: 5 //阴影扩散程度
                  )
            ],
          ),
          child: Text("BoxShadow(绘制阴影)+Container+BoxDecoration"),
        ));
  }
}

通过英文单词理解:

box-盒子

shadow-阴影

blur-模糊

spread-传播扩散

我们可以理解为: 这样一个装有widget的盒子的外面需要添加阴影效果,我们可以设置阴影扩散范围和阴影模糊程度.