After dragging, scroll to the top,

[MiaoShichang]

Problem: After dragging, scroll to the top

want : After dragging, don't scroll to the top

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_draggable_gridview/flutter_draggable_gridview.dart';

class TPPinJieHomePage extends StatefulWidget {
  const TPPinJieHomePage({super.key});

  @override
  State<TPPinJieHomePage> createState() => _TPPinJieHomePageState();
}

class _TPPinJieHomePageState extends State<TPPinJieHomePage> {
  final List<int> _datalist = [];

  @override
  void initState() {
    super.initState();
    for (int i = 0; i < 50; i++) {
      _datalist.add(i);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: const CupertinoNavigationBar(
          middle: Text("drag"),
        ),
        body: DraggableGridViewBuilder(
          gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
            crossAxisCount: 4,
            crossAxisSpacing: 1,
            mainAxisSpacing: 1,
          ),
          dragCompletion: (List<DraggableGridItem> list, int beforeIndex, int afterIndex) {
            print('onDragAccept: $beforeIndex -> $afterIndex');
            int one = _datalist[beforeIndex];
            if (afterIndex > beforeIndex) {
              _datalist.insert(afterIndex + 1, one);
              _datalist.removeAt(beforeIndex);
            } else if (afterIndex < beforeIndex) {
              _datalist.insert(afterIndex, _datalist[beforeIndex]);
              _datalist.removeAt(beforeIndex + 1);
            }
          },
          children: _getItems(),
          dragFeedback: (List<DraggableGridItem> list, int index) {
            return SizedBox(
              width: 100,
              height: 100,
              child: Container(
                  decoration: BoxDecoration(
                    border: Border.all(color: Colors.red, width: 2),
                  ),
                  child: list[index].child),
            );
          },
        ));
  }

  List<DraggableGridItem> _getItems() {
    List<DraggableGridItem> items = [];
    for (var one in _datalist) {
      items.add(DraggableGridItem(
        isDraggable: true,
        child: Container(
          color: Colors.orange,
          padding: const EdgeInsets.all(10),
          child: Center(child: Text("$one")),
        ),
      ));
    }

    items.add(DraggableGridItem(
      child: Container(
        color: Colors.orange,
        padding: const EdgeInsets.all(10),
        child: const Center(child: Text("picker")),
      ),
    ));
    return items;
  }
}