Used to return hit test information from the TextBlock.HitTest(float, float) method.
public struct HitTestResult
The code point index of the first code point in the cluster that the point is closest to.
The zero based index of the closest line to the passed y-coordinate.
The code point index of the first code point in the cluster that the point is actually over, or -1 if not over a cluster.
The zero based index of the line number the y-coordinate is directly over, or -1 if the y-coordinate is before the first line, or after the last line.