Draggable element inside a GridView in flutter has wrong position

Solution for Draggable element inside a GridView in flutter has wrong position
is Given Below:

Hi everyone I’m trying to use a GridView of icons and I want to drag those elements outsite the GridView in another widget. Once I start dragging an icon there is a gap between the starting drag point and the feedback widget. I tried also to set feedbackOffset but it didn’t work.

I prepared an example code as POC

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(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: IconsCollector(),
    );
  }
}

// import 'package:flutter_svg_provider/flutter_svg_provider.dart';

class IconsCollector extends StatefulWidget {
  const IconsCollector({
    Key? key,
  }) : super(key: key);

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

class _IconsCollectorState extends State<IconsCollector> {
  List<Widget> out = [];

  List iconlist = [
    Icon(Icons.ac_unit),
    Icon(Icons.ac_unit),
    Icon(Icons.ac_unit),
    Icon(Icons.ac_unit),
    Icon(Icons.ac_unit),
  ];

  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    var screensize = MediaQuery.of(context).size;

    return 
    GridView.builder(
                scrollDirection: Axis.vertical,
                itemCount: iconlist.length,
                gridDelegate: new SliverGridDelegateWithFixedCrossAxisCount(
                  crossAxisCount: 7,
                ),
                itemBuilder: (BuildContext context, int index) {
                  return Draggable(
                      hitTestBehavior: HitTestBehavior.translucent,
                      feedback:  Container(
                          width: screensize.width * 0.1,
                          height: screensize.height * 0.55,
                          margin: EdgeInsets.all(12),
                          decoration: new BoxDecoration(
                            boxShadow: <BoxShadow>[
                              BoxShadow(
                                color: Colors.grey,
                                offset: Offset(1.1, 1.1),
                                blurRadius: 10.0,
                              ),
                            ],
                            color: Colors.white,
                            border: Border.all(width: 5),
                            // borderRadius: new BorderRadius.all(Radius.circular(30.0)),
                            shape: BoxShape.circle,
                          ),

                          child: ClipRRect(
                              borderRadius: BorderRadius.circular(30.0),
                              child: iconlist[index])),
                      data: index,
                      child: Container(
                          width: screensize.width * 0.1,
                          height: screensize.height * 0.55,
                          margin: EdgeInsets.all(12),
                          decoration: new BoxDecoration(
                            boxShadow: <BoxShadow>[
                              BoxShadow(
                                color: Colors.grey,
                                offset: Offset(1.1, 1.1),
                                blurRadius: 10.0,
                              ),
                            ],
                            color: Colors.white,
                            border: Border.all(width: 5),
                            // borderRadius: new BorderRadius.all(Radius.circular(30.0)),
                            shape: BoxShape.circle,
                          ),

                          child: ClipRRect(
                              borderRadius: BorderRadius.circular(30.0),
                              child: iconlist[index])));
                });
          

    
  }
}

Anybody has any idea how to solve this issue? I cannot use drag_and_drop_gridview because I want to drag the icon outside the GridView.

My flutter doctor output:

[✓] Flutter (Channel stable, 2.2.3, on Linux, locale en_US.utf8)
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
[✓] Chrome - develop for the web
[✓] Linux toolchain - develop for Linux desktop
[✓] Android Studio (version 4.1)
[✓] VS Code (version 1.58.2)
[✓] Connected device (3 available)

• No issues found!

I attach a screenshot of the emulator. The same thing happens on a real device too.
Note the gap between the mouse pointer and the dragged icon
Thank you all for any suggestions!

It happening because in feed back your container size is big and you are clippling with transparent background here i fixed it,

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: IconsCollector(),
    );
  }
}

// import 'package:flutter_svg_provider/flutter_svg_provider.dart';

class IconsCollector extends StatefulWidget {
  const IconsCollector({
    Key? key,
  }) : super(key: key);

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

class _IconsCollectorState extends State<IconsCollector> {
  List<Widget> out = [];

  List iconlist = [
    Icon(Icons.ac_unit),
    Icon(Icons.ac_unit),
    Icon(Icons.ac_unit),
    Icon(Icons.ac_unit),
    Icon(Icons.ac_unit),
  ];

  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    var screensize = MediaQuery.of(context).size;

    return GridView.builder(
        scrollDirection: Axis.vertical,
        itemCount: iconlist.length,
        gridDelegate: new SliverGridDelegateWithFixedCrossAxisCount(
          crossAxisCount: 7,
        ),
        itemBuilder: (BuildContext context, int index) {
          return Draggable(
            hitTestBehavior: HitTestBehavior.translucent,
            feedback: Container(
              height:120,
              width:120,
              decoration: new BoxDecoration(
                boxShadow: <BoxShadow>[
                  BoxShadow(
                    color: Colors.grey,
                    offset: Offset(1.1, 1.1),
                    blurRadius: 10.0,
                  ),
                ],
                color: Colors.white,
                border: Border.all(width: 5),
                shape: BoxShape.circle,
              ),
              child: ClipRRect(
                borderRadius: BorderRadius.circular(30.0),
                child: iconlist[index],
              ),
            ),
            data: index,
            child: Container(
              width: screensize.width * 0.1,
              height: screensize.height * 0.55,
              margin: EdgeInsets.all(12),
              decoration: new BoxDecoration(
                boxShadow: <BoxShadow>[
                  BoxShadow(
                    color: Colors.grey,
                    offset: Offset(1.1, 1.1),
                    blurRadius: 10.0,
                  ),
                ],
                color: Colors.white,
                border: Border.all(width: 5),
                shape: BoxShape.circle,
              ),
              child: ClipRRect(
                borderRadius: BorderRadius.circular(30.0),
                child: iconlist[index],
              ),
            ),
          );
        });
  }
}