Flutter: Page View

import 'package:flutter/material.dart';

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


class ViewPagerDemo extends StatefulWidget{
  @override
  State<StatefulWidget> createState() {
    // TODO: implement createState
    return ViewPagerState();
  }

}

class ViewPagerState extends State<ViewPagerDemo>{
  var _pageSnapping = true;
  var _horizontalDirection = false;
  var _reverse = true;
  final PageController pageController = PageController(initialPage: 0);
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          backgroundColor: Colors.pink,
          title: Text("Page View Demo Screen"),
          elevation: 0,

        ),
        body: Column(
          children: [
            Container(
              height: 300.0,
              width: 300.0,
              child: PageView(
                reverse: _reverse,
                controller: pageController,
                scrollDirection: _horizontalDirection ? Axis.horizontal : Axis.vertical,
                pageSnapping: _pageSnapping,
                children: [
                  getPageWidget("Page 1", Colors.pink),
                  getPageWidget("Page 2", Colors.teal),
                  getPageWidget("Page 3", Colors.purple),
                ],
              ),
            ),
            Center(
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                children: [
                  Text("Page Snapping", style: TextStyle(fontWeight: FontWeight.bold),),
                  Checkbox(value: _pageSnapping, onChanged: (pageSnappingValue) {
                    setState(() {
                      _pageSnapping = pageSnappingValue;
                      print("OnChange");
                      print(_pageSnapping);
                    });
                  })
                ],
              ),
            ),
          Center(
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceEvenly,
              children: [
                Text("Horizontal Direction", style: TextStyle(fontWeight: FontWeight.bold),),
                Checkbox(value: _horizontalDirection, onChanged: (direction) {
                  setState(() {
                    _horizontalDirection = direction;
                    print("Direction");
                    print(_horizontalDirection);
                  });
                })
              ],
            ),
          ),
            Center(
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                children: [
                  Text("Reverse", style: TextStyle(fontWeight: FontWeight.bold),),
                  Checkbox(value: _reverse, onChanged: (reverse) {
                    setState(() {
                      _reverse = reverse;
                      print("Reverse");
                      print(_reverse);
                    });
                  })
                ],
              ),
            ),
          ],
        ),
      ),
    );

  }
}
Widget getPageWidget(String text, MaterialColor backgroundColor) {
  return Container(
    color: backgroundColor,
    child: Center(
        child: Text(
          text,
          style: TextStyle(fontWeight: FontWeight.bold, fontSize: 20.0,color: Colors.white),
        )),
  );
}