飞镖 – 如何在Flutter中做“磨砂玻璃”效果？

import 'dart:ui';
import 'package:Flutter/material.dart';

void main() {
  runApp(new MaterialApp(home: new FrostedDemo()));
}

class FrostedDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      body: new Stack(
        children: <Widget>[
          new ConsTrainedBox(
            consTraints: const BoxConsTraints.expand(),child: new Flutterlogo()
          ),new Center(
            child: new ClipRect(
              child: new BACkdropFilter(
                filter: new ImageFilter.blur(sigmaX: 10.0,sigmaY: 10.0),child: new Container(
                  width: 200.0,height: 200.0,decoration: new BoxDecoration(
                    color: Colors.grey.shade200.withOpacity(0.5)
                  ),child: new Center(
                    child: new Text(
                      'Frosted',style: Theme.of(context).textTheme.display3
                    ),),],);
  }
}