public CircleSliderSurfaceItemImplements(CircleSliderSurfaceItem item, EvasObject parent, CircleSurface surface) : base(parent, surface)
        {
            _item = item;
            item.PropertyChanged += ItemPropertyChanged;
            ValueChanged         += OnValueChanged;

            BackgroundAngle       = item.BackgroundAngle;
            BackgroundAngleOffset = item.BackgroundAngleOffset;
            if (item.BackgroundColor != default(Xamarin.Forms.Color))
            {
                BackgroundColor = item.BackgroundColor.ToNative();
            }
            if (item.BackgroundLineWidth != -1)
            {
                BackgroundLineWidth = item.BackgroundLineWidth;
            }
            if (item.BackgroundRadius != -1)
            {
                BackgroundRadius = item.BackgroundRadius;
            }

            BarAngle        = item.BarAngle;
            BarAngleOffset  = item.BarAngleOffset;
            BarAngleMaximum = item.BarAngleMaximum;
            BarAngleMinimum = item.BarAngleMinimum;
            if (item.BarColor != default(Xamarin.Forms.Color))
            {
                BarColor = item.BarColor.ToNative();
            }
            if (item.BarLineWidth != -1)
            {
                BarLineWidth = item.BarLineWidth;
            }
            if (item.BarRadius != -1)
            {
                BarRadius = item.BarRadius;
            }

            Minimum   = item.Minimum;
            Maximum   = item.Maximum;
            Step      = item.Increment;
            Value     = item.Value;
            IsEnabled = item.IsEnabled;

            if (item.IsVisible)
            {
                Show();
            }
            else
            {
                Hide();
            }
        }
        public TCCircleSliderSurfaceItem2()
        {
            InitializeComponent();

            _slider1 = new CircleSliderSurfaceItem
            {
                BackgroundColor       = Color.Blue,
                BackgroundRadius      = 170,
                BackgroundLineWidth   = 20,
                BackgroundAngleOffset = 90,
                BackgroundAngle       = 270,
                BarColor        = Color.Red,
                BarRadius       = 170,
                BarLineWidth    = 18,
                BarAngleOffset  = 90,
                BarAngleMaximum = 180,
                BarAngleMinimum = 10,
                Increment       = 1,
                Value           = 1,
            };

            _slider2 = new CircleSliderSurfaceItem
            {
                BackgroundColor     = Color.LightGray,
                BackgroundRadius    = 140,
                BackgroundLineWidth = 15,
                BarColor            = Color.Green,
                BarRadius           = 140,
                BarLineWidth        = 13,
                Maximum             = 6,
                Minimum             = 1,
                Increment           = 0.5,
                Value = 3,
            };

            label1.SetBinding(Label.TextProperty, "Value", BindingMode.Default, new ValueConverter1());
            label2.SetBinding(Label.TextProperty, "Value", BindingMode.Default, new ValueConverter2());
            label1.BindingContext = _slider1;
            label2.BindingContext = _slider2;

            CircleSurfaceItems.Add(_slider1);
            CircleSurfaceItems.Add(_slider2);

            _focusedItem      = "slider1";
            RotaryFocusObject = _slider1;
        }