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Re: Text height for printing (fixed width)

Subject: Re: Text height for printing (fixed width)
From: Jérôme Jaglale <email@hidden>
Date: Tue, 3 Jan 2006 21:19:57 +0400
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Le 3 janv. 06, à 17:12, Jerry Krinock a écrit :

Sorry I have not read these or your project, but it sounds similar to the question in this recent thread:

http://www.cocoabuilder.com/archive/message/cocoa/2005/12/20/152875

You're right, it was my question. You gave the Apple NSLayout Guide method. But it didn't really satisfy me, because you said :

You may find that you need to add a little margin.  I don't know why,
but to guarantee no wrapping I have to add 15 pixels to the returned
measurement.  The required margin may depend on your font, size, etc.

It's true : sometimes (and only sometimes !), it needs a margin. To have a font independent margin , I just add a breakline at the end of the string when there isn't :

		if( ! [aString hasSuffix:@"\n"])
		aString = [NSString stringWithFormat:@"%@\n", aString];

It's isn't perfect because there is sometimes a small extra vertical space.

The complete method : // from Apple Text NSLayout Programming Guide - (float) heightForStringDrawingV1:(NSString *)aString withFont:(NSFont *)aFont andWitdh:(float)myWidth { if( ! [aString hasSuffix:@"\n"]) aString = [NSString stringWithFormat:@"%@\n", aString]; NSTextStorage *textStorage = [[[NSTextStorage alloc] initWithString:aString] autorelease]; NSTextContainer *textContainer = [[[NSTextContainer alloc] initWithContainerSize:NSMakeSize(myWidth,1e7)] autorelease]; NSLayoutManager *layoutManager = [[[NSLayoutManager alloc] init] autorelease]; [layoutManager addTextContainer:textContainer]; [textStorage addLayoutManager:layoutManager]; [textStorage addAttribute:NSFontAttributeName value:aFont range:NSMakeRange(0,[textStorage length])]; [textContainer setLineFragmentPadding:0.0]; (void) [layoutManager glyphRangeForTextContainer:textContainer]; return [layoutManager usedRectForTextContainer:textContainer].size.height; }

Thanks for your help Jerry, it's your post which gave me this idea ! _______________________________________________
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