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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