// 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. import 'package:flutter/material.dart'; /// Flutter code sample for [SizeTransition]. void main() => runApp(const SizeTransitionExampleApp()); class SizeTransitionExampleApp extends StatelessWidget { const SizeTransitionExampleApp({super.key}); @override Widget build(BuildContext context) { return const MaterialApp( home: SizeTransitionExample(), ); } } class SizeTransitionExample extends StatefulWidget { const SizeTransitionExample({super.key}); @override State<SizeTransitionExample> createState() => _SizeTransitionExampleState(); } /// [AnimationController]s can be created with `vsync: this` because of /// [TickerProviderStateMixin]. class _SizeTransitionExampleState extends State<SizeTransitionExample> with TickerProviderStateMixin { late final AnimationController _controller = AnimationController( duration: const Duration(seconds: 3), vsync: this, )..repeat(); late final Animation<double> _animation = CurvedAnimation( parent: _controller, curve: Curves.fastOutSlowIn, ); @override void dispose() { _controller.dispose(); super.dispose(); } @override Widget build(BuildContext context) { return Scaffold( body: SizeTransition( sizeFactor: _animation, axis: Axis.horizontal, axisAlignment: -1, child: const Center( child: FlutterLogo(size: 200.0), ), ), ); } }