| // 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 'dart:math'; |
| |
| import 'package:flutter/material.dart'; |
| |
| /// Flutter code sample for [MatrixTransition]. |
| |
| void main() => runApp(const MatrixTransitionExampleApp()); |
| |
| class MatrixTransitionExampleApp extends StatelessWidget { |
| const MatrixTransitionExampleApp({super.key}); |
| |
| @override |
| Widget build(BuildContext context) { |
| return const MaterialApp( |
| home: MatrixTransitionExample(), |
| ); |
| } |
| } |
| |
| class MatrixTransitionExample extends StatefulWidget { |
| const MatrixTransitionExample({super.key}); |
| |
| @override |
| State<MatrixTransitionExample> createState() => _MatrixTransitionExampleState(); |
| } |
| |
| /// [AnimationController]s can be created with `vsync: this` because of |
| /// [TickerProviderStateMixin]. |
| class _MatrixTransitionExampleState extends State<MatrixTransitionExample> with TickerProviderStateMixin { |
| late AnimationController _controller; |
| late Animation<double> _animation; |
| |
| @override |
| void initState() { |
| super.initState(); |
| _controller = AnimationController( |
| duration: const Duration(seconds: 2), |
| vsync: this, |
| )..repeat(); |
| _animation = CurvedAnimation( |
| parent: _controller, |
| curve: Curves.linear, |
| ); |
| } |
| |
| @override |
| void dispose() { |
| _controller.dispose(); |
| super.dispose(); |
| } |
| |
| @override |
| Widget build(BuildContext context) { |
| return Scaffold( |
| body: Center( |
| child: MatrixTransition( |
| animation: _animation, |
| child: const Padding( |
| padding: EdgeInsets.all(8.0), |
| child: FlutterLogo(size: 150.0), |
| ), |
| onTransform: (double value) { |
| return Matrix4.identity() |
| ..setEntry(3, 2, 0.004) |
| ..rotateY(pi * 2.0 * value); |
| }, |
| ), |
| ), |
| ); |
| } |
| } |