twitter_spinner.dart

import 'dart:math';
import 'dart:ui';

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

///Primary Color of Twitter
const kTwitterPrimaryColor = Color(0xFF1da1f2);

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Scaffold(
        body: Center(
          child: CustomPaint(
            painter: TwitterSpinnerPainter(),
          ),
        ),
      ),
    );
  }
}


class TwitterSpinnerPainter extends CustomPainter {

  @override
  void paint(Canvas canvas, Size size) {
    double radius = 25;
    double width = 8;

    Paint innerCirclePaint = Paint()
      ..color = kTwitterPrimaryColor.withOpacity(0.3)
      ..style = PaintingStyle.stroke
      ..strokeWidth = width;

    Offset center = new Offset(size.width / 2, size.height / 2);
    canvas.drawCircle(center, radius, innerCirclePaint);
  }

  @override
  bool shouldRepaint(TwitterSpinnerPainter oldDelegate) {
    //Will be changed later
    return false;
  }
}