dart - 高程不适用于 flutter Material

Question

我想做一个看起来像这样的应用程序 角落里的那片。我可以制作那张幻灯片，但我的应用程序没有那个阴影。

我将我的前层包裹在一个带有高度的 Material 宽盖内，如示例 MDC-104 .

这是我的代码

import 'package:flutter/material.dart';

class ShapeLayer extends StatelessWidget {
  final Widget frontLayer;
  final Widget backLayer = Container(
    color: Colors.green,
  );

  ShapeLayer({Key key, this.frontLayer}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Stack(
      children: <Widget>[
        backLayer,
        Material(
          elevation: 60.0,
          shape: BeveledRectangleBorder(
            borderRadius: BorderRadius.only(topLeft: Radius.circular(46.0)),
          ),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: <Widget>[
              Expanded(child: frontLayer),
            ],
          ),
        ),
      ],
    );
  }
}

我是这样使用的:

return Scaffold(
  appBar: appBar,
  body: ShapeLayer(frontLayer: Container(//Some stuff here)

它看起来像这样:

如您所见，它看起来很平坦，完全没有高程。

我该如何解决这个问题？

谢谢!

编辑:正如@SnakeyHips 建议的那样，这是我的应用程序，海拔 16.0

Answer 1

将您的海拔从 60.0 更改为 16.0 应该这样做:

import 'package:flutter/material.dart';

class ShapeLayer extends StatelessWidget {
  final Widget frontLayer;
  final Widget backLayer = Container(
    color: Colors.green,
  );

  ShapeLayer({Key key, this.frontLayer}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Stack(
      children: <Widget>[
        backLayer,
        Material(
          elevation: 16.0,
          shape: BeveledRectangleBorder(
            borderRadius: BorderRadius.only(topLeft: Radius.circular(46.0)),
          ),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: <Widget>[
              Expanded(child: frontLayer),
            ],
          ),
        ),
      ],
    );
  }
}