I'm beginning the conversion of a scientific app from Carbon to Cocoa, and have run into a problem with NSTextView. FWIW, I have it embedded in an NSScrollView that is in turn included as an HICocoaView in a Carbon window (but I don't think this is relevant to my problem). It works, but I've run into a glitch that I can't figure out how to solve. In some cases, I need to be able to edit files containing DNA sequences that look like this:
sequence-name-1 ACCGACTACCGACT... sequence-name-2 GACCACTGACCACT... The number of characters in the sequences may run into the tens of thousands, with no spaces or other word breaks. If a file like this is opened in TextEdit (or my program, or Smultron, or TeXShop, or apparently any other NSTextView-based editor with the exception of SubEthaEdit) and I try to insert a non-space character into the middle of the DNA sequence, a painfully long pause (e.g., 30 sec) ensues (with a spinning cursor) before the character appears on the screen and the app becomes responsive again. Inserting the character into sequence name or the intervening whitespace works normally, as does inserting a space character. Spin Control indicates that all of this time is being spent in doubleClickAtIndex (called from NSTextView insertText:replacementRange:_markTextEditedForRange). I can't figure out why the typing of a character causes doubleClickAtIndex to be called, but I wouldn't care if I could just get my editor to stop going AWOL. It does seem like typing a character triggers some kind of word-boundary recalculation that is horribly expensive if the "word" is thousands of characters long. I've tried every NSTextView setting I can think of, and that's when I started looking at other editors to see if they had the same problem as I was having, and they did (except for SubEthaEdit). Is there anything obvious that I might be doing wrong? The fact that the same problem happens in TextEdit as well as several other editors suggests that it's a general problem, but the observation that SubEthaEdit *doesn't* have this problem indicates that there is something I could do to fix it--I just don't know what. Any ideas? I'm really frustrated by this. Dave -- David L. Swofford Center for Evolutionary Genomics Institute for Genome Sciences & Policy Box 90338 Duke University Durham, NC 27708 USA _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
