inventree-app/lib/widget/spinner.dart

import "package:flutter/material.dart";
import "package:inventree/app_colors.dart";

class Spinner extends StatefulWidget {
  const Spinner({
    this.color = COLOR_GRAY_LIGHT,
    Key? key,
    @required this.icon,
    this.duration = const Duration(milliseconds: 1800),
  }) : super(key: key);

  final IconData? icon;
  final Duration duration;
  final Color color;

  @override
  _SpinnerState createState() => _SpinnerState();
}

class _SpinnerState extends State<Spinner> with SingleTickerProviderStateMixin {
  late AnimationController? _controller;
  Widget? _child;

  @override
  void initState() {
    _controller = AnimationController(
      vsync: this,
      duration: Duration(milliseconds: 2000),
    )..repeat();
    _child = Icon(widget.icon, color: widget.color);

    super.initState();
  }

  @override
  void dispose() {
    _controller!.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return RotationTransition(turns: _controller!, child: _child);
  }
}