class Spinner extends StatefulWidget {
@override
_SpinnerState createState() => _SpinnerState();
}
class _SpinnerState extends State<Spinner> with SingleTickerProviderStateMixin {
AnimationController _controller;
@override
void initState() {
super.initState();
_controller = AnimationController(
duration: const Duration(seconds: 10),
vsync: this,
)..repeat();
}
@override
void dispose() {
_controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return AnimatedBuilder(
animation: _controller,
child: Container(width: 200.0, height: 200.0, color: Colors.green),
builder: (BuildContext context, Widget child) {
return Transform.rotate(
angle: _controller.value * 2.0 * math.pi,
child: child,
);
},
);
}
}
