: ConstraintLayout
    {
        private string _title;
        public string Title
        {
            get => _title;
            set
            {
                _title = value;
                _titleView.Text = _title;
            }
        }

        public string Time { get; set; }
        public event Action Add;

        private float _progress;
        public float Progress
        {
            get => _progress;
            set
            {
                _progress = value;
                Invalidate();
            }
        }

        private readonly TextView _titleView;
        private readonly TextView _timeView;
        private readonly Button _addButton;

        private readonly Paint _backgroundPaint;
        private readonly Paint _gradientPaint;
        private readonly Paint _indicatorPaint;
        private readonly float _edgeOffset;

        public CircleProgress(Context context) : this(context, null, 0)
        {
        }

        public CircleProgress(Context context, IAttributeSet attrs) : this(context, attrs, 0)
        {
        }

        public CircleProgress(Context context, IAttributeSet attrs, int defStyleAttr) : base(context, attrs, defStyleAttr)
        {
            base.SetWillNotDraw(false);
            base.Id = ViewCompat.GenerateViewId();

            _titleView = new TextView(Context) { Id = ViewCompat.GenerateViewId() };
            _timeView = new TextView(Context) { Id = ViewCompat.GenerateViewId() };
            _addButton = new Button(Context) { Id = ViewCompat.GenerateViewId() };

            _addButton.Click += AddButtonOnClick;

            base.AddView(_titleView);
            base.AddView(_timeView);
            base.AddView(_addButton);

            var constraintSet = new ConstraintSet();
            constraintSet.Clone(this);
            constraintSet.SetVerticalChainStyle(_titleView.Id, 0);
            constraintSet.Connect(_titleView.Id, ConstraintSet.Top, base.Id, ConstraintSet.Top, 0);
            constraintSet.Connect(_titleView.Id, ConstraintSet.Bottom, _timeView.Id, ConstraintSet.Top, 0);
            constraintSet.Connect(_titleView.Id, ConstraintSet.Start, base.Id, ConstraintSet.Start, 0);
            constraintSet.Connect(_titleView.Id, ConstraintSet.End, base.Id, ConstraintSet.End, 0);
            constraintSet.Connect(_timeView.Id, ConstraintSet.Top, _titleView.Id, ConstraintSet.Bottom, 0);
            constraintSet.Connect(_timeView.Id, ConstraintSet.Bottom, _addButton.Id, ConstraintSet.Top, 0);
            constraintSet.Connect(_timeView.Id, ConstraintSet.Start, base.Id, ConstraintSet.Start, 0);
            constraintSet.Connect(_timeView.Id, ConstraintSet.End, base.Id, ConstraintSet.End, 0);
            constraintSet.Connect(_addButton.Id, ConstraintSet.Top, _timeView.Id, ConstraintSet.Bottom, 0);
            constraintSet.Connect(_addButton.Id, ConstraintSet.Bottom, base.Id, ConstraintSet.Bottom, 0);
            constraintSet.Connect(_addButton.Id, ConstraintSet.Start, base.Id, ConstraintSet.Start, 0);
            constraintSet.Connect(_addButton.Id, ConstraintSet.End, base.Id, ConstraintSet.End, 0);
            constraintSet.ApplyTo(this);

            _edgeOffset = TypedValue.ApplyDimension(ComplexUnitType.Dip, 15, base.Resources.DisplayMetrics);

            _backgroundPaint = new Paint(PaintFlags.AntiAlias)
            {
                StrokeWidth = _edgeOffset,
                Color = Color.AliceBlue
            };

            _backgroundPaint.SetStyle(Paint.Style.Stroke);

            _gradientPaint = new Paint(PaintFlags.AntiAlias)
            {
                StrokeWidth = _edgeOffset,
                StrokeCap = Paint.Cap.Round
            };

            _gradientPaint.SetStyle(Paint.Style.Stroke);

            _indicatorPaint = new Paint(PaintFlags.AntiAlias)
            {
                Color = Color.Black,
                StrokeWidth = TypedValue.ApplyDimension(ComplexUnitType.Dip, 2f, base.Resources.DisplayMetrics)
            };

            _indicatorPaint.SetStyle(Paint.Style.Stroke);

            Progress = 50;
            _titleView.Text = "TIME LEFT";
            _timeView.Text = DateTime.Now.ToShortTimeString();
        }

        private void AddButtonOnClick(object sender, EventArgs e)
        {
            Add?.Invoke();
        }

        protected override void OnMeasure(int widthMeasureSpec, int heightMeasureSpec)
        {
            base.OnMeasure(widthMeasureSpec, heightMeasureSpec);
            if (_gradientPaint.Shader == null)
            {
                _gradientPaint.SetShader(new SweepGradient(Width / 2f, Height / 2f,
                    new int[] { Color.Orange, Color.Violet, Color.Blue }, null));
            }
        }

        public override void Draw(Canvas canvas)
        {
            base.Draw(canvas);
            var angle = -Progress * 3.6f;
            var radius = Width / 2f - _edgeOffset;
            canvas.DrawCircle(radius + _edgeOffset, radius + _edgeOffset, (Width - 2 * _edgeOffset) / 2f, _backgroundPaint);
            canvas.DrawArc(_edgeOffset, _edgeOffset, Width - _edgeOffset, Height - _edgeOffset, 270, angle, false, _gradientPaint);
            var circleAngle = (angle + 270) * Math.PI / 180;
            canvas.DrawCircle(radius * (float)Math.Cos(circleAngle) + radius + _gradientPaint.StrokeWidth,
                radius * (float)Math.Sin(circleAngle) + radius + _gradientPaint.StrokeWidth, _edgeOffset / 2, _indicatorPaint);
        }
    }