NSTextStorage subclassing issue in 10.4
NSTextStorage subclassing issue in 10.4
- Subject: NSTextStorage subclassing issue in 10.4
- From: Keith Blount <email@hidden>
- Date: Tue, 24 May 2005 09:52:58 -0700 (PDT)
- Comment: DomainKeys? See http://antispam.yahoo.com/domainkeys
Hello,
I am having some slowdown issues in a very specific
circumstance under Tiger and would be very grateful if
anybody could offer me any advice on how to fix this.
I have a text view that uses a subclass of
NSTextStorage. This subclass has an extra attribute
entitled KBNoteAttributeName, which associates a
KBNote object with a range of text. A KBNote object is
just a very simple model object (NSObject subclass)
that stores a string and the range of text with which
it is associated. In my concrete subclass of
NSTextStorage, I call my own -fixNoteAttributes method
to update the associated ranges of the notes from
-replaceCharactersInRange:withString:,
-setAttributes:range:, and -addAttribute:value:range:,
as specified by the docs and elsewhere. All this works
fine and quickly EXCEPT when there is a large amount
of text and the user selects it all and applies
Tiger's list formatting (eg. bullets) to the whole
selection. It seems that one problem is that
-fixNoteAttributes gets called *every* time a bullet
point is added rather than after all of the bullet
points have been added.
This is my fixNoteAttributes method:
-(void)fixNoteAttributes
{
NSRange effectiveRange;
KBNote *note;
// notes is an NSMutableArray which stores all notes
as a convenience
[notes removeAllObjects];
NSRange all = NSMakeRange(0,[self length];
while (all.length > 0)
{
note = [self attribute:KBNoteAttributeName
atIndex:all.location
longestEffectiveRange:&effectiveRange
inRange:all
if (note)
{
[note setAttachedCharRange:effectiveRange]; //
update
[notes addObject:note];
}
all = NSMakeRange(NSMaxRange(effectiveRange),
NSMaxRange(all) - NSMaxRange(effectiveRange));
}
}
If anybody has any ideas on how I might improve this
or get rid of the slowdown issues I am experiencing, i
would be very grateful.
Many thanks in advance,
Keith
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