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boundingRectWithSize problem?
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boundingRectWithSize problem?


  • Subject: boundingRectWithSize problem?
  • From: Tony Pollard <email@hidden>
  • Date: Wed, 25 Jan 2012 15:26:11 +0000

Hi folks,

I'm having a strange problem with NSAttributedString boundingRectWithSize in getting the needed height for a fixed width.  It works 99% of the time, but it consistently underestimates the height for certain text (by approximately one line).  There doesn't appear to be a pattern for the text that works and the text that fails  (tested on 10.6 and 10.7).

The code is:

NSRect textRect = [attrString boundingRectWithSize:NSMakeSize(300.0, 0.0)					// Width 300, any height (max height also fails)
									options: NSStringDrawingUsesLineFragmentOrigin |		// Needed for multi-line
											NSStringDrawingDisableScreenFontSubstitution];

The attributed strings are built from data sources.  Here's one that fails:

Printing description of attrString:
n. {
    CdctPhraseType = Grammer;
    NSColor = NSCalibratedRGBColorSpace 0.878431 0.0980392 0.160784 1;
    NSFont = "LucidaGrande 9.00 pt. P [] (0x50bbd0) fobj=0x50b7b0, spc=2.85";
}A hopper is a device shaped like a large funnel, in which substances such as grain, coal, animal food, or sand can be stored.{
    CdctPhraseType = Transition;
    NSColor = NSCalibratedRGBColorSpace 0.227451 0.54902 0.258824 1;
    NSFont = "LucidaGrande 9.00 pt. P [] (0x50bbd0) fobj=0x50b7b0, spc=2.85";
}
{
}F.ex: Large trailers came along and tipped it into a big hopper.{
    CdctPhraseType = Transition;
    NSColor = NSCalibratedRGBColorSpace 0.227451 0.54902 0.258824 1;
    NSFont = "LucidaGrande 9.00 pt. P [] (0x50bbd0) fobj=0x50b7b0, spc=2.85";
}

The resulting Rect is too short by about 9 pixels.  Anyone had the same problem?

Tony Pollard




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