Re: Layout manager's -rectArrayForCharacterRange:::: returns zero rectangles??
Re: Layout manager's -rectArrayForCharacterRange:::: returns zero rectangles??
- Subject: Re: Layout manager's -rectArrayForCharacterRange:::: returns zero rectangles??
- From: John Stiles <email@hidden>
- Date: Mon, 25 Feb 2008 11:23:22 -0800
Hmm. I tried another approach and it's still no good. This produces
NSZeroRect:
NSLayoutManager* layout = [myTextView layoutManager];
NSRange glyphRange = [layout glyphRangeForCharacterRange:selection
actualCharacterRange:NULL];
rect = [layout boundingRectForGlyphRange:glyphRange
inTextContainer:[myTextView
textContainer]];
Interestingly, this only happens in the -textViewDidChangeSelection:
delegate. If I defer the call until after -textViewDidChangeSelection:
completes, then I can call the exact same function with the exact same
inputs, and get a valid result.
If no one else has any ideas, maybe that's what I'll end up doing…
John Stiles wrote:
I'm trying to write some code which figures out where the insertion
point is located, every time the selection changes. (Imagine a text
editor which has a "current line number" indicator at the bottom of
the screen that stays updated as the user types.)
To do this, in my text view's delegate, I have implemented the
delegate method -textViewDidChangeSelection:. From there I call
-selectedRange and then ask the layout manager for the rectangles via:
NSRectArray rects = [[myTextView layoutManager]
rectArrayForCharacterRange:selection
withinSelectedCharacterRange:NSMakeRange(NSNotFound, 0)
inTextContainer:[myTextView textContainer]
rectCount:&rectCount];
Normally, this works perfectly.
However, if I go to the very end of the document and start making
insertions or deletions, I don't get a rectangle back—"rectCount" is
zero. I've checked [[[TextView() textStorage] string] length] and
compared it against the selection, so I'm pretty confident that I'm
not querying past the end of the text, which in the past is the only
time I've seen behavior like this up until now.
Any ideas as to what's wrong? This seems pretty straightforward to me
so I'm not sure what I'm missing.
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