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Re: NSTextViews with embedded pictures and vertical alignment

On 30 Jun 2004, at 16:56, Douglas Davidson wrote:

However, the original problem proposed here sounds like it's just an image attachment, which would most easily be handled by a standard NSTextAttachment and the standard NSTextAttachmentCell that it automatically generates. In that case, the thing to do would be to set a baseline offset via NSBaselineOffsetAttributeName on the attachment character in the attributed string.

Aha. That's a much better solution in the circumstances.

In TextEdit, you can manipulate this with the Font/Baseline/Raise and Lower menu items; if you're doing it programmatically, you can just directly set a value for the attribute on the text.

I just tried this in TextEdit and noticed an unexpected behaviour. It seems that if I lower the image baseline then while it does indeed sit below the line it seems to keep the same total rise above the line, so the height of the image cell is increased by the amount by which the baseline is lowered and there is a section of white space inserted between the top of the image and the line above. I would have expected that the size of the cell would remain the same and that lowering the baseline would simply drop the whole image down. It turns out that the same happens with text (unsurprisingly, given my understanding of the layout system) and this means that, for instance, TextEdit seems incapable of displaying a row of letters with some in larger font than others and with the tops of all the letters aligned without also having blank space above the line. At the bottom of this mail is a fragment of RTF that demonstrates this.

Is this a bug, is it a feature or am I misunderstanding what the baseline offset is designed to do?

For those of you at WWDC, I'll be presenting an example of doing this programmatically in session 411.

I'd love to come. You can't move the conference over to England for me can you? :-)

Cheers,
Nicko

======= RTF to show baseline offset issue =======

{\rtf1\mac\ansicpg10000\cocoartf102
{\fonttbl\f0\fswiss\fcharset77 Helvetica;}
{\colortbl;\red255\green255\blue255;}

\f0\fs24 \cf0 XXXX\
X
\fs80 \dn40 X
\fs24 \up0 X\
XXXX\
}

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References: 
 >NSDateFormatter not validating input (From: David Alter <email@hidden>)
 >NSTextViews with embedded pictures and vertical alignment (From: John Stiles <email@hidden>)
 >Re: NSTextViews with embedded pictures and vertical alignment (From: Nicko van Someren <email@hidden>)
 >Re: NSTextViews with embedded pictures and vertical alignment (From: Douglas Davidson <email@hidden>)



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