import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: SemanticsPageViewHomePage(),
    );
  }
}

class SemanticsPageViewHomePage extends StatefulWidget {
  const SemanticsPageViewHomePage();

  _SemanticsPageViewHomePageState createState() => _SemanticsPageViewHomePageState();
}

class _SemanticsPageViewHomePageState extends State<SemanticsPageViewHomePage> {

  List<Widget> _children = [];

  Widget _buildPage() {
    return Semantics(
      explicitChildNodes: true,
      child: Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            Text("test 1"),
            Text("test 2")
          ],
        ),
      ),
    );
  }

  void _buildChildren() {
    _children.clear();
    _children.add(_buildPage());
    _children.add(_buildPage());
    _children.add(_buildPage());
  }

  @override
  void initState() {
    _buildChildren();

    super.initState();
  }

  @override
  void didUpdateWidget(SemanticsPageViewHomePage oldWidget) {
    _buildChildren();

    super.didUpdateWidget(oldWidget);
  }

  @override
  Widget build(BuildContext context) {

    return Scaffold(
        body: Column(
          mainAxisSize: MainAxisSize.max,
          children: <Widget>[
            Expanded(
              child: PageView(
                children: _children,
              ),
            ),
            Container(
              color: Colors.red,
              height: 60
            )
          ],
        )
    );
  }
}