/**
Container({
Key key,//唯一标识符，用于查找更新
this.alignment,//控制child的对齐方式
this.padding,//内边距
Color color,//背景色
Decoration decoration,//绘制在child下层的装饰，不能与color同时使用
this.foregroundDecoration,//绘制在child上层的装饰
double width,//
double height,//
BoxConstraints constraints,//添加到child上额外的约束条件
this.margin,//
this.transform,//设置container的变换矩阵，类型为Matrix4。
this.child,//
})
*/
/**
const BoxDecoration({
this.color,
this.image,
this.border,
this.borderRadius,
this.boxShadow,//border四周添加阴影效果
this.gradient,//装饰器的过度效果，比如可以用来给组件添加一个蒙层
this.backgroundBlendMode,
this.shape = BoxShape.rectangle,
})
*/
body: Container(
width: 350.0,
height: 350.0,
padding: EdgeInsets.all(50.0),
color: Color(0xfff1f1f1),
child: Center(
child: Container(
width: 300.0,
height: 300.0,
decoration: BoxDecoration(
color: Color(0xffffffff),
border: Border.all(color: Color(0xffff0000), width: 1.0),
borderRadius: BorderRadius.circular(10.0),
shape: BoxShape.rectangle,
image: DecorationImage(image: NetworkImage(
boxShadow: [
BoxShadow(color: Color(0xffff0000), blurRadius: 6),
]
),
// transform: Matrix4.rotationZ(0.5),
child: Center(
child: Container(
width: 100.0,
height: 100.0,
alignment: Alignment.center,
foregroundDecoration: BoxDecoration(
color: Color(0xffff0000),
border: Border.all(color: Color(0xff000000), width: 5.0),
gradient: LinearGradient(
colors: [
Color(0x880000ff),
Color(0x8800ff00),
Color(0x88ff0000),
])
),
child: Text("这是个widget"),
),
),
),
),
),