Scrolling Text

[eBob.com]

I'm trying to develop a control similar to TextBox and RichTextBox - less
functional actually but with a wrinkle which I need and which TextBox and
RichTextBox do not have. I can use a statement like this

grfx.DrawString ("The quick brown fox jumped over ...", Font, Brushes.Black,
rectf)

to display text in a control. This call wraps the text, so the resulting
display might look like this ...

The quick
brown fox
jumped over
....

But what do I do when I want to scroll down one line? So far as I can tell
I have no way of knowing where the text wrapped. I know that I could do the
wrapping myself iteratively using MeasureString to determine where the wrap
will occur and then keeping track of the offset to the first character of
each line and how many characters fit on that line. But that seems very
inelegant and very inefficient - especially since the call to DrawString
which automatically wraps the text is already figuring that out. So is
there a solution to this or will I have to bite the bullet and do it the
inelegant and inefficient way?

Thanks, Bob