Re: Setting spell-checker underlines

FROM : Douglas Davidson
DATE : Thu Jan 10 20:44:14 2008

On Jan 10, 2008, at 9:45 AM, I. Savant wrote:

>  Ah! I stand corrected, Douglas, thanks. My original point still
> remains, though - unless you're using it for misspelled words, you'll
> need to come up with your own marker. This means (unless I'm further
> mistaken), creating your own temporary attribute, setting it on the
> attributed string, then properly rendering it in the text view (which,
> IMO, is done most easily by drawing it on the text view itself via
> -drawViewBackgroundInRect:).


Yes, in general I would not recommend using the spelling indicator for 
purposes that diverge radically from its original signification.  If 
you need to do custom drawing of this sort that depends on the 
location of individual glyphs, it's probably easiest to do so by 
subclassing NSLayoutManager, and overriding one of its drawing 
methods.  I believe we have examples available of this technique.  The 
regions of text requiring special drawing can be indicated either by 
ordinary attributes on the text, or by temporary attributes on the 
layout manager, depending on the persistence of the attributes in 
question.

Douglas Davidson