Flutter Scroll View auto scroll - scrollview

Question

I have automated the scrolling of top coloured containers using animateto(). However, when I scroll down the screen, the scroll does not pause, but continues even though the scrolling boxes are off the screen. How do I pause scrolling when the boxes are off the screen and restart scrolling when the come into view...automatically. Note: I do not want to use any Flutter dependency.
Here is my code:
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
#override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
late ScrollController _scrollController;
double _place = 0;
#override
void initState() {
_scrollController = ScrollController();
super.initState();
WidgetsBinding.instance.addPostFrameCallback((context) async {
double x = 0;
while (x < 10) {
_place = x;
_doMove();
x++;
await Future.delayed(const Duration(seconds: 5));
}
});
}
_doMove() {
_scrollController.animateTo(105 * _place,
duration: Duration(seconds: 1), curve: Curves.easeInOut);
}
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Material App',
home: Scaffold(
appBar: AppBar(
title: Text('Material App Bar'),
),
body: SingleChildScrollView(
child: Column(
children: [
Container(
height: 100,
child: ListView.builder(
itemCount: 20,
controller: _scrollController,
scrollDirection: Axis.horizontal,
itemBuilder: (context, index) => Container(
margin: const EdgeInsets.all(2),
width: 100,
color: Colors.amber,
child: Center(
child: Text(
'$index',
textAlign: TextAlign.center,
),
),
),
),
),
Column(
children: List.generate(
20,
(index) => ListTile(
title: Text('Person $index'),
),
),
)
],
),
)),
);
}
}