[Flutter] How to get widget's absolute coordinates on a screen in Flutter?

How to get widget's absolute coordinates on a screen in Flutter?

Or its offset in a parent

Example:

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Simple app',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: SimpleScreen(
title: 'Simple screen',
),
);
}
}

class SimpleScreen extends StatefulWidget {
final String title;

SimpleScreen({Key key, this.title}) : super(key: key);

@override
_SimpleScreenState createState() => new _SimpleScreenState();
}

class _SimpleScreenState extends State<SimpleScreen> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Container(
width: 48.0,
height: 48.0,
color: Colors.blue,
),
),
);
}
}


Goal is to get Container's offset in parent. If Center's size is 48.0, then Container's offset in Center's parent/root

Condition: you don't know the wrapper layout (it's a library widget), should be flexible, without hardcoded values

Thanks

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