Dart Flutter Drawer 作为单独的小部件不允许修改宽度

你的大部分代码都没问题.然而，你应该只做Widget side(BuildContext context)而不是SideDrawer class extends StatelessWidget

这是完整的Main.省道

import 'package:flutter/material.dart';
import 'side.dart';
import 'user.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: HomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class HomePage extends StatefulWidget {
  HomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  User user = new User("name","firstname","adress","username");

 Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home'),
      ),
      drawer: new SideDrawer(user:user),
      body: Center(
        child: Text('Home page'),
      ),
    );
  }
}

这是包含side Drawer的另一个文件

import 'package:flutter/material.dart';
import 'main.dart';
import 'user.dart';

class SideDrawer extends StatelessWidget {

  const SideDrawer({Key key, this.user}) : super(key: key);
  final User user;

  @override
  Widget build(BuildContext context) {
      return new SizedBox(
        width: MediaQuery.of(context).size.width * 0.85,//20.0, 
        child: Drawer(
            child: new ListView(
          children: <Widget>[
            new DrawerHeader(
              child: new Text("DRAWER HEADER.."),
              decoration: new BoxDecoration(color: Colors.orange),
            ),
            new ListTile(
              title: new Text(user.name),
              onTap: () {
                Navigator.pop(context);
                Navigator.push(context,
                    new MaterialPageRoute(builder: (context) => new HomePage()));
              },
            ),
            new ListTile(
              title: new Text(user.firstname),
              onTap: () {
                Navigator.pop(context);
                Navigator.push(context,
                    new MaterialPageRoute(builder: (context) => new HomePage()));
              },
            ),
            new ListTile(
              title: new Text(user.adress),
              onTap: () {
                Navigator.pop(context);
                Navigator.push(context,
                    new MaterialPageRoute(builder: (context) => new HomePage()));
              },
            ),
            new ListTile(
              title: new Text(user.username),
              onTap: () {
                Navigator.pop(context);
                Navigator.push(context,
                    new MaterialPageRoute(builder: (context) => new HomePage()));
              },
            ),
          ],
        )),
      );
    }
}

下面是它最终是如何显示的:

个

跳过这个对你有帮助.

致以问候

EDIT:

我已经更新了代码和图片以满足您的需求.我还做了一个假User class，只是为了演示.