Rounded corners for a framelayout in Xamarin Android

RoundedCornersFrameLayout.cs

using Android.Content;
using Android.Graphics;
using Android.Util;
using Android.Widget;

namespace Droid
{
    public class RoundedCornersFrameLayout : FrameLayout
    {
        private const float CornerRadius = 5.0f;

        private Path _path = new Path();
        private RectF _rect = new RectF();

        public bool RoundedCorners { get; set; } = false;

        public RoundedCornersFrameLayout(Context ctx, IAttributeSet attr)
            : base(ctx, attr)
        {
        }

        protected override void OnSizeChanged(int w, int h, int oldw, int oldh)
        {
            base.OnSizeChanged(w, h, oldw, oldh);

            if (RoundedCorners)
            {
                _path.Reset();
                _rect.Set(0, 0, w, h);

                _path.AddRoundRect(_rect, CornerRadius, CornerRadius, Path.Direction.Cw);

                _path.Close();
            }
        }

        protected override void DispatchDraw(Canvas canvas)
        {
            if (RoundedCorners)
            {
                var save = canvas.Save();
                canvas.ClipPath(_path);

                base.DispatchDraw(canvas);

                canvas.RestoreToCount(save);
            }
            else
            {
                base.DispatchDraw(canvas);
            }
        }
    }
}