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49 lines
1.3 KiB
49 lines
1.3 KiB
// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter_web/material.dart';
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class SpinningSquare extends StatefulWidget {
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@override
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_SpinningSquareState createState() => new _SpinningSquareState();
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}
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class _SpinningSquareState extends State<SpinningSquare>
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with SingleTickerProviderStateMixin {
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AnimationController _animation;
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@override
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void initState() {
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super.initState();
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// We use 3600 milliseconds instead of 1800 milliseconds because 0.0 -> 1.0
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// represents an entire turn of the square whereas in the other examples
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// we used 0.0 -> math.pi, which is only half a turn.
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_animation = new AnimationController(
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duration: const Duration(milliseconds: 3600),
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vsync: this,
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)..repeat();
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}
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@override
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Widget build(BuildContext context) {
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return new RotationTransition(
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turns: _animation,
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child: new Container(
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width: 200.0,
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height: 200.0,
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color: const Color(0xFF00FF00),
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));
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}
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@override
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void dispose() {
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_animation.dispose();
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super.dispose();
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}
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}
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void main() {
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runApp(new Center(child: new SpinningSquare()));
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}
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