examples/api/lib/widgets/implicit_animations/animated_fractionally_sized_box.0.dart

// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Flutter code sample for AnimatedFractionallySizedBox

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  static const String _title = 'Flutter Code Sample';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: _title,
      home: Scaffold(
        appBar: AppBar(title: const Text(_title)),
        body: const MyStatefulWidget(),
      ),
    );
  }
}

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

  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}

class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  bool selected = false;

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () {
        setState(() {
          selected = !selected;
        });
      },
      child: Center(
        child: SizedBox(
          width: 200,
          height: 200,
          child: Container(
            color: Colors.red,
            child: AnimatedFractionallySizedBox(
              widthFactor: selected ? 0.25 : 0.75,
              heightFactor: selected ? 0.75 : 0.25,
              alignment: selected ? Alignment.topLeft : Alignment.bottomRight,
              duration: const Duration(seconds: 1),
              curve: Curves.fastOutSlowIn,
              child: Container(
                color: Colors.blue,
                child: const FlutterLogo(size: 75),
              ),
            ),
          ),
        ),
      ),
    );
  }
}