gistfile1.cs

    public abstract class TooltipContentBase {
        public Font Font;
        public Point Location;
        public Size Size;

        public abstract void Render (Graphics g);
        public abstract Size Measure (Graphics g);
    }

    public class DeltaInfoTooltipContent : TooltipContentBase {
        public readonly DeltaInfo Delta;
        public DeltaInfo.RenderParams RenderParams;

        public DeltaInfoTooltipContent (DeltaInfo delta, DeltaInfo.RenderParams renderParams) {
            Delta = delta;
            RenderParams = renderParams;
        }

        public override void Render (Graphics g) {
            RenderParams.ContentRegion = new Rectangle(
                0, 0, Size.Width, Size.Height
            );
            RenderParams.Font = Font;
            Delta.Render(g, ref RenderParams);
        }

        public override Size Measure (Graphics g) {
            var sf = RenderParams.StringFormat;

            var width = (int)Math.Ceiling(g.MeasureString(Delta.ToString(true), Font, 99999, sf).Width);
            var lineHeight = g.MeasureString("AaBbYyZz", Font, width, sf).Height;
            return new Size(
                width, (int)Math.Ceiling(lineHeight * (Delta.Traceback.Frames.Count + 1))
            );
        }
    }