Just to add a little info to my previous message, which was a little
misleading:a
My custom glyph generator replaces each glyph that is supposed to be hidden
with NSNullGlyph (it doesn't just insert one NSNullGlyph for the lot of them),
so I would expect the one-to-one mapping on this first pass of glyph generation
to be maintained. I'm therefore really not sure why I'm getting all of these
errors - it seems that the presence of a group of null glyphs completely breaks
things at the typesetting stage (I'm guessing)? Hmm, given that there is so
little documentation about this sort of thing and most glyph generation threads
seem to have been unanswered, I don't hold out much hope...
In case there is a better way of doing things: I am basically trying to
implement hidden text, so that text with a given custom attribute does not get
displayed in the text view. One way I could have done this was via a custom
text storage subclass that maintained two representations of its text - one
with the hidden text displayed, one with it, um, hidden - but this is no good
for what I want, as the same text storage can be displayed in two different
text views, and there is more than one attribute type that can be hidden
separately.
Hence the custom glyph generator, which isn't working...
Thanks in advance for any help or pointers.
All the best,
Keith
--- ORIGINAL MESSAGE ---
Hi,
I have a custom glyph generator (NSGlyphGenerator subclass) that is used to
hide glyphs for text with certain attributes. It does this by inserting a
single NSNullGlyph for a range of glyphs representing text with these hidden
attributes. (This is basically a hidden text toggle.) This all works
brilliantly - I can completely hide whole ranges of text - but only so long as
the text is viewed in a single text view.
If I have the same text storage shared between two text views, and one view has
the text hidden whilst the other doesn't, I get array out of bounds errors
under the following circumstances: If, in the view where no text is hidden, I
click in the range of text that IS hidden in the other view, and then I hit
return a couple of times, I get these errors:
Exception raised during background layout: *** NSRunStorage,
_NSBlockNumberForIndex(): index (345) beyond array bounds (335)
2008-03-08 10:28:00.042 HiddenTextTest[42350:813] *** NSRunStorage,
_NSBlockNumberForIndex(): index (345)
Clearly, these errors are caused because my hidden-text view has less glyphs in
it than the non-hidden-text view, but they both share the same text storage. So
my question is, how do I fix this? Somewhere it seems that I need to tell
something else - other than my glyph generator - that some text is hidden. The
errors seem to indicate that I might need to tell my text storage about this...
But where and how? But then, I can't tell the text storage, because it has
hidden text in one view but not the other...
The method of hiding text by inserting a null glyph was recommended to me by
DTS, but there is very little documentation on actually achieving something
like this, so I'm hoping some text expert here will be able to give me some
clues. :)
Many thanks in advance and all the best,
Keith
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