ConstrainedBox（每日Flutter 小部件）

受限制的Box控件

const BoxConstraints({
  this.minWidth = 0.0,
  this.maxWidth = double.infinity,
  this.minHeight = 0.0,
  this.maxHeight = double.infinity,
});

class ConstrainedBoxWidget extends StatelessWidget {


  @override
  Widget build(BuildContext context) {
    return _myWidget;
  }

  get _myWidget {
    return ConstrainedBox(
        constraints: BoxConstraints(
            minHeight: 30,
            minWidth: 30,
            maxHeight: 150,
            maxWidth: 150
        ),
        child: Container(
             200,
            height: 150,
            decoration: BoxDecoration(
                borderRadius: BorderRadius.circular(20),
                gradient: LinearGradient(
                  colors: [Colors.blue, Colors.purple],
                )
            )
        )

    );
  }

}