find-snip

Returns the snip at a given position or #f if an appropriate snip cannot be found.

• (send a-text find-snip pos direction s-pos) -> snip% object or #f
      pos : exact non-negative integer
      direction : symbol in '(before-or-none before after after-or-none)
      s-pos = #f : boxed exact non-negative integer or #f

  If the position pos is between two snips, direction specifies which snip to return; direction can be any of the following:

  • 'before-or-none -- returns the snip before the position, or #f if pos is 0
  • 'before -- returns the snip before the position, or the first snip if pos is 0
  • 'after -- returns the snip after the position, or the last snip if pos is the last position
  • 'after-or-none - returns the snip after the position, or #f if pos is the last position are larger

  The s-pos box is filled with the position where the returned snip starts, unless s-pos is #f.