blob: 958766d152da24a16ae51df0ee599195c07698ea [file] [log] [blame]
// 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 AnimatedWidget
import 'dart:math' as math;
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 SpinningContainer extends AnimatedWidget {
const SpinningContainer({
super.key,
required AnimationController controller,
}) : super(listenable: controller);
Animation<double> get _progress => listenable as Animation<double>;
@override
Widget build(BuildContext context) {
return Transform.rotate(
angle: _progress.value * 2.0 * math.pi,
child: Container(width: 200.0, height: 200.0, color: Colors.green),
);
}
}
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 final AnimationController _controller = AnimationController(
duration: const Duration(seconds: 10),
vsync: this,
)..repeat();
@override
void dispose() {
_controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return SpinningContainer(controller: _controller);
}
}