Xamarin - Center Button Text + Left Drawable

CenteredButtonDrawable.cs

public class CenteredButtonDrawable : Button {
		private static int LEFT = 0, TOP = 1, RIGHT = 2, BOTTOM = 3;

		// Pre-allocate objects for layout measuring
		private Rect textBounds = new Rect();
		private Rect drawableBounds = new Rect();

		public CenteredButtonDrawable(Context context) : base(context, null) {
		}

		public CenteredButtonDrawable(Context context, IAttributeSet attrs) : base(context, attrs) {
		}

		public CenteredButtonDrawable(Context context, IAttributeSet attrs, int defStyle) : base(context, attrs, defStyle) {
		}

		protected override void OnLayout(bool changed, int left, int top, int right, int bottom) {
			base.OnLayout(changed, left, top, right, bottom);

			if (!changed) return;

			var text = this.Text;
			if (!System.String.IsNullOrEmpty(text)) {
				var textPaint = this.Paint;
				textPaint.GetTextBounds(text, 0, text.Length, textBounds);
			} else {
				textBounds.SetEmpty ();
			}

			var width = this.Width - (this.PaddingLeft + this.PaddingRight);

			var drawables = this.GetCompoundDrawables ();

			if (drawables[LEFT] != null) {
				drawables[LEFT].CopyBounds(drawableBounds);
				int leftOffset =
					(width - (textBounds.Width () + drawableBounds.Width ()) + this.RightPaddingOffset) / 2 - this.CompoundDrawablePadding;
				drawableBounds.Offset(leftOffset, 0);
				drawables [LEFT].Bounds = drawableBounds;
			}

			if (drawables[RIGHT] != null) {
				drawables[RIGHT].CopyBounds(drawableBounds);
				int rightOffset =
					((textBounds.Width () + drawableBounds.Width ()) - width + this.LeftPaddingOffset) / 2 + this.CompoundDrawablePadding;
				drawableBounds.Offset(rightOffset, 0);
				drawables[RIGHT].Bounds = drawableBounds;
			}
		}
	}