animated_rotation_button_page.dart

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  double _angle = 0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: AnimatedRotationButton(
          child: Text(
            'Clique me!',
            style: TextStyle(color: Colors.white),
          ),
          angle: _angle,
          onPressed: () {
            setState(() {
              _angle += 45 * pi / 180;
            });
          },
        ),
      ),
    );
  }
}