// 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 DefaultTextStyleTransition 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 const MaterialApp( title: _title, home: MyStatefulWidget(), ); } } class MyStatefulWidget extends StatefulWidget { const MyStatefulWidget({super.key}); @override State<MyStatefulWidget> createState() => _MyStatefulWidgetState(); } /// AnimationControllers can be created with `vsync: this` because of TickerProviderStateMixin. class _MyStatefulWidgetState extends State<MyStatefulWidget> with TickerProviderStateMixin { late AnimationController _controller; late TextStyleTween _styleTween; late CurvedAnimation _curvedAnimation; @override void initState() { super.initState(); _controller = AnimationController( duration: const Duration(seconds: 2), vsync: this, )..repeat(reverse: true); _styleTween = TextStyleTween( begin: const TextStyle( fontSize: 50, color: Colors.blue, fontWeight: FontWeight.w900), end: const TextStyle( fontSize: 50, color: Colors.red, fontWeight: FontWeight.w100), ); _curvedAnimation = CurvedAnimation( parent: _controller, curve: Curves.elasticInOut, ); } @override void dispose() { _controller.dispose(); super.dispose(); } @override Widget build(BuildContext context) { return Center( child: DefaultTextStyleTransition( style: _styleTween.animate(_curvedAnimation), child: const Text('Flutter'), ), ); } }