ConcentricOnboardView pt4

ConcentricOnboardView.cs

    public sealed class ConcentricOnboardView : SKCanvasView
    {
        private SKRect buttonRect = new SKRect();
        private SKColor backgroundColor;
        private SKColor buttonColor;
        private SKSurface surface;
        private SKImageInfo info;
        private SKCanvas canvas;

        public ConcentricOnboardView()
        {
            buttonColor = SKColorHelper.GetRandomColor(RandomMode.LightOnly);
            backgroundColor = SKColorHelper.GetRandomColor(RandomMode.LightOnly);
            EnableTouchEvents = true;

        }

        protected override void OnTouch(SKTouchEventArgs args)
        {
            var point = args.Location;

            switch (args.ActionType)
            {
                case SKTouchAction.Pressed:
                    if (buttonRect.Contains(point))
                        ActionButtonClicked();
                    break;

                case SKTouchAction.Moved:
                case SKTouchAction.Released:
                case SKTouchAction.Cancelled:
                    break;
            }

            base.OnTouch(args);
        }

        private void ActionButtonClicked()
        {
            if (IsBusy) return;
            IsBusy = true;

            buttonColor = SKColorHelper.GetRandomColor(RandomMode.LightOnly);
            InvalidateSurface();

            ExecuteAnimationAsync()
                .SafeFireAndForget(onException: ex => Console.WriteLine(ex));

            if (Command?.CanExecute(this) ?? false)
                Command?.Execute(this);
        }

        private async Task ExecuteAnimationAsync()
        {
            OnAnimationStart?.Invoke(this, EventArgs.Empty);

            while (CurrentProgress < 2 * limit)
            {
                CurrentProgress += step;
                await Task.Delay((int)(timerStep * 1000));
                InvalidateSurface();
            }

            var color = buttonColor;
            var bgColor = backgroundColor;

            backgroundColor = color;
            buttonColor = bgColor;
            CurrentProgress = 0;
            IsBusy = false;
        }
    }