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我正在尝试创建一个可拖动的类似滑块的小部件（如确认滑块）。我的问题是是否有办法限制可拖动区域？

import 'package:flutter/material.dart';

import 'confirmation_slider.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      home: new Scaffold(
        body: new ListView(
          children: <Widget>[
            new Container(
              margin: EdgeInsets.only(
                top: 50.0
              ),
            ),

            new Container(
              margin: EdgeInsets.only(
                left: 50.0,
                right: 50.0
              ),
              child: new Draggable(
                axis: Axis.horizontal,
                child: new FlutterLogo(size: 50.0),
                feedback: new FlutterLogo(size: 50.0),
              ),

              height: 50.0,
              color: Colors.green
            ),
          ],
        ),
      ),
    );
  }
}

我想象容器类会限制可拖动区域，但它似乎并没有这样做。