Re: [NSTextStorage/NSAttributedString] How can we know the height of a rendered string?

[Jean-Daniel Dupas]

Le 6 juil. 08 à 21:25, Stéphane Sudre a écrit :

Problem:
--------



Solution that does not work:
----------------------------




{
        float tHeight=0;
        
        if (inString!=nil)
        {
                NSTextStorage * tTextStorage;
                        
                tTextStorage=[[NSTextStorage alloc] initWithString:inString];
                
                if (tTextStorage!=nil)
                {
                        NSTextContainer * tTextContainer;
                        

                        
                        if (tTextContainer!=nil)
                        {
                                NSLayoutManager * tLayoutManager = 
[[NSLayoutManager alloc] init];
                                
                                tLayoutManager = [[NSLayoutManager alloc] init];
                                
                                if (tLayoutManager!=nil)
                                {
                                        [tLayoutManager 
addTextContainer:tTextContainer];
                                        
                                        [tTextStorage 
addLayoutManager:tLayoutManager];


                                        
                                        [tTextContainer 
setLineFragmentPadding:0.0];

                                        [tLayoutManager 
glyphRangeForTextContainer:tTextContainer];
                                        
                                        

                                        
                                        [tLayoutManager release];
                                }
                                
                                [tTextContainer release];
                        }
                        
                        [tTextStorage release];
                }
        }
        
        return tHeight;
}

I would like/need to know the height that would be required to render a string inside a fixed width box. So far, I've been using a solution found from a google search and which looks like this: - (float) heightOfString:(NSString *) inString forFont:(NSFont *) inFont andMaxWidth:(float) inMaxWidth tTextContainer = [[NSTextContainer alloc] initWithContainerSize: NSMakeSize(inMaxWidth, FLT_MAX)]; [tTextStorage addAttribute:NSFontAttributeName value:inFont range:NSMakeRange(0, [tTextStorage length])]; tHeight=NSHeight([tLayoutManager usedRectForTextContainer:tTextContainer]);

You have to make sure it is ready before using this function.

[tLayoutManager ensureLayoutForTextContainer:tTextContainer];

usedRectForTextContainer: causes neither glyph generation nor layout, and so the result is may be inaccurate (the layout manager may be computing the layout in background and does not have finish).

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