如何在Flutter中将新MaterialPageRoute作为子控件树打开

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: HomePage(),
    );
  }
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home'),
      ),
      body: Center(
        child: ElevatedButton(
          onPressed: () {
            MaterialPageRoute route = MaterialPageRoute(
              builder: (context) => NewPage(),
            );
            Navigator.of(context).push(route);
          },
          child: Text('Open New Page'),
        ),
      ),
    );
  }
}

class NewPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('New Page'),
      ),
      body: Center(
        child: Text('This is a new page.'),
      ),
    );
  }
}