You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
samples/web/spinning_square/lib/main.dart

49 lines
1.3 KiB

// Copyright 2018 The Chromium 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_web/material.dart';
class SpinningSquare extends StatefulWidget {
@override
_SpinningSquareState createState() => new _SpinningSquareState();
}
class _SpinningSquareState extends State<SpinningSquare>
with SingleTickerProviderStateMixin {
AnimationController _animation;
@override
void initState() {
super.initState();
// We use 3600 milliseconds instead of 1800 milliseconds because 0.0 -> 1.0
// represents an entire turn of the square whereas in the other examples
// we used 0.0 -> math.pi, which is only half a turn.
_animation = new AnimationController(
duration: const Duration(milliseconds: 3600),
vsync: this,
)..repeat();
}
@override
Widget build(BuildContext context) {
return new RotationTransition(
turns: _animation,
child: new Container(
width: 200.0,
height: 200.0,
color: const Color(0xFF00FF00),
));
}
@override
void dispose() {
_animation.dispose();
super.dispose();
}
}
void main() {
runApp(new Center(child: new SpinningSquare()));
}