Re: Text height for printing (fixed width)
Re: Text height for printing (fixed width)
- Subject: Re: Text height for printing (fixed width)
- From: Aki Inoue <email@hidden>
- Date: Tue, 3 Jan 2006 11:59:52 -0800
Jérôme,
What you (and others) are observing here is the typesetter behavior
difference between measurement and rendering.
You're using one of string drawing convenience to render text, but
using NSLayoutManager for measurement.
Currently the string drawing convenience methods defined in
NSStringDrawing.h are using
NSTypesetterBehavior_10_2_WithCompatibility whereas the default
setting for NSLayoutManager is NSTypesetterLatestBehavior.
This causes line height calculation mismatch.
A easy solution for your problem is to add the following line in -
heightForStringDrawingV1:withFont:andWitdh:.
[layoutManager
setTypesetterBehavior:NSTypesetterBehavior_10_2_WithCompatibility];
Ideally, you should use the same layout manager you used to measure
for rendering (especially for performance).
Aki
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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