Re: visual-line-mode

[David Reitter]

On 4 Jul 2008, at 16:49, Stefan Monnier wrote:

> > If we had a way to determine the buffer position for given pixel
> > coordinates (something like posn-point, without requiring the event
> > structure that contains the information),
>
> Does posn-at-x-y provide the info you need?

That's a pretty good suggestion, thanks.
This should make it possible to write a non-iterative algorithm, as  
below.

I'll see if I can make it work for the scrolling case and insert goal  
columns etc.

- D


(defun go-up (point)
  (interactive "p")
  (let ((x (car (posn-x-y (posn-at-point)))))
    (vertical-motion -1)
    (let ((y (cdr (posn-x-y (posn-at-point)))))
      (posn-set-point (posn-at-x-y x y)))))