On Jul 12, 2010, at 6:01 PM, David Swofford wrote: > 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.
Could you post a test file somewhere? I just tried creating 187 pages of repeating ACCGACTACCGACT in TextEdit and it worked fine. _______________________________________________ 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
