AnimatedPositioned example

main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: HomePage(),
    );
  }
}

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

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  final targetX = 200;
  final targetY = 200;

  int currentX = 0;
  int currentY = 0;

  @override
  void initState() {
    super.initState();
    Future.delayed(const Duration(seconds: 3), () {
      if (mounted) {
        setState(() {
          currentX = targetX;
          currentY = targetY;
        });
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('AnimatedPositionedExample')),
      body: Stack(
        children: [
          AnimatedPositioned(
            child: Container(color: Colors.lime, height: 50, width: 50),
            left: currentX.toDouble(),
            top: currentY.toDouble(),
            duration: const Duration(seconds: 1),
            curve: Curves.linear,
          )
        ],
      ),
    );
  }
}