--- Fred Kiefer <[EMAIL PROTECTED]> wrote: > Gregory John Casamento wrote: > > > > P.S. Fred, I'm aware of no place in the code where it replaces items with > NULL > > if they are nil. :) > > > > Sorry, my fault, I used the word NULL as a short hand for [NSNull null], > as can be see in the following line (used about five times in the code > of NSOutlineView): > > id sitem = (startitem == nil)?[NSNull null]:startitem; > > This makes it possible to work with nil almost as if it was a valid > item, but why would you want to do this? This also has been done half > heartedly, so some of the replacements, as in the method at hand > (reloadItem:reloadChildren:) hs not been done.
The above is a special case. In NSOutlineView "nil" is considered to be the root of the tree, but you can't store nil as the key of a something in a NSMap, so I used NSNull as a substitute. The only time you will receive the item=nil is in the case of the "root" element which contains the first displayed element of the tree. See, in the documentation, the method "levelForItem:" for this. Thanks, GJC ===== Gregory John Casamento -- CEO/President Open Logic Corp. -- bheron on #gnustep, #linuxstep, & #gormtalk ---------------- Please sign the petition against software patents at: http://www.petitiononline.com/pasp01/petition.html -- Maintainer of Gorm (featured in April Linux Journal) ------- __________________________________ Do you Yahoo!? Yahoo! Finance: Get your refund fast by filing online. http://taxes.yahoo.com/filing.html _______________________________________________ Bug-gnustep mailing list [EMAIL PROTECTED] http://mail.gnu.org/mailman/listinfo/bug-gnustep
