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How to detect clipping of text in NSTextView?

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How to detect clipping of text in NSTextView?

Subject: How to detect clipping of text in NSTextView?
From: Leon Starr <email@hidden>
Date: Wed, 27 Jun 2007 09:05:02 -0700

I have an NSTextView with a fixed width that resizes vertically
up to a maximum depth (two lines).

The user may enter a string a bit longer than what I am allowing the
text view to display.  (I don't want to resize the view to accommodate
the text).

I would like to display a visual cue so that the user knows text has
been clipped.  Like a + sign or something.

Is there some notification that will tell me when the text view's container begins to clip text?

I know that I can use -sizeWithAttributes to get a single-line bounding box size, but that doesn't take into account line wrapping. Otherwise I could just compare bounding box sizes on each text change. (Worst case, I suppose I could just work out the line wrap computation myself...)

Any pointers or suggestions greatly appreciated!


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