Swipe next and previous page in flutter

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Dart

Flutter

Hello i am making app on flutter i need help in pageview builder whem your swipe left want jump pervious and when user swipe right i want user go to next page but for example user is 6 postion the click on swipe left it jum to postion 5 if it click on swipe right it jump 6 postion again i only want this using swipe in pageviewbuilder i have gridview in pervious sacreen when user select any item from gridview it navigate to Singleimage sacreen here is code of that sacreen so example if user clicked the item 6 from gridview it go to singlimage sacreen now when user swipe i want it postion jump to 5 or if it swipe right it postion must 7

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';

class Singleimage extends StatefulWidget {
  late final String foldername;
   late final int categorynumber;
  late final int index;
  late final String categoryname;

  Singleimage(this.foldername, this.categorynumber, this.index, this.categoryname);

  @override
  _SingleimageState createState() => _SingleimageState();
}

class _SingleimageState extends State<singleimage> {
  PageController controller = PageController();

  Duration pageTurnDuration = Duration(milliseconds: 500);
  Curve pageTurnCurve = Curves.ease;
  @override
  void initState() {
    super.initState();

  }



    @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title:Text('Name'),
      ),
      body: PageView.builder(
        onPageChanged: (int page) {
          // this page variable is the new page and will change before the pageController fully reaches the full, rounded int value
    
        },

        itemBuilder: (context, position) {
          return Container(
            child: Text('${position}',style: TextStyle(
              fontSize: 20
            ),),
            color: Colors.red,
          );
        },
        itemCount: 10,
      )
    );
  }
}

What I have tried:

i tried many time no solution found on any website