Flutter AnimatedPositioned Example

AnimatedPositioned is an animated version of Positioned widget. It can transition the child’s position when there is a change in its child’s position values.

The widget requires to be a child of Stack widget to make it work.

import 'package:flutter/material.dart';

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

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

class _HomepageState extends State<Homepage> {
  bool _play = false;

  @override
  Widget build(BuildContext context) {

    return Scaffold(
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Stack(
          children: [
            AnimatedPositioned(
                top: 0,
                left: _play ? MediaQuery.of(context).size.width - 150 : 0,
                child: Container(width: 100, height: 100, color: Colors.red),
                duration: Duration(seconds: 1)),
            AnimatedPositioned(
                top: _play ? MediaQuery.of(context).size.width / 2 - 50 : 0,
                left: _play ? MediaQuery.of(context).size.width / 2 - 50 : 0,
                child: Container(width: 100, height: 100, color: Colors.green),
                duration: Duration(seconds: 1)),
            AnimatedPositioned(
                top: _play ? MediaQuery.of(context).size.height - 150 : 0,
                left: 0,
                child: Container(width: 100, height: 100, color: Colors.blue),
                duration: Duration(seconds: 1)),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          setState(() {
            _play = !_play;
          });
        },
        child: Icon(Icons.play_arrow),
      ),
    );
  }
}

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