如何仅在SplitView中的特定容器中单击时显示下一页(无状态小部件)，而不是整个页面

import 'package:flutter/material.dart';

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

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

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('SplitView Demo'),
      ),
      body: Row(
        children: <Widget>[
          Expanded(
            flex: 1,
            child: Container(
              color: Colors.grey,
              child: Center(
                child: GestureDetector(
                  onTap: () {
                    Navigator.push(
                      context,
                      MaterialPageRoute(builder: (context) => NextPage()),
                    );
                  },
                  child: Container(
                    width: 200,
                    height: 200,
                    color: Colors.blue,
                    child: Center(
                      child: Text(
                        'Click me!',
                        style: TextStyle(
                          color: Colors.white,
                          fontSize: 24,
                        ),
                      ),
                    ),
                  ),
                ),
              ),
            ),
          ),
          Expanded(
            flex: 3,
            child: Container(
              color: Colors.white,
              child: Center(
                child: Text(
                  'Detail View',
                  style: TextStyle(fontSize: 24),
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}

class NextPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Next Page'),
      ),
      body: Center(
        child: Text(
          'Next Page Content',
          style: TextStyle(fontSize: 24),
        ),
      ),
    );
  }
}