Re: adding space for 'annotations' with a typesetter subclass
Re: adding space for 'annotations' with a typesetter subclass
- Subject: Re: adding space for 'annotations' with a typesetter subclass
- From: Ross Carter <email@hidden>
- Date: Mon, 04 Jun 2012 14:45:41 -0400
On Jun 1, 2012, at 9:36 AM, Bill Dudney wrote:
> I'm able to add additional space around a paragraph in my subclass of NSATSTypesetter's implementation of willSetLineFragmentRect:forGlyphRange:usedRect:baselineOffset:. However, I am not getting what I expect as I tweak the parameters to this method. I was hoping for some insight on what these parameters really mean from the group to help me understand why I'm not getting what I expect.
>
> When I increase the height of the lineFragmentRect and the usedRect the space for the paragraph does grow and I get the space I expect.
>
> What is confusing me is where the line of text is drawn in the lineFragmentRect. Based on experimentation the line of text is always drawn near the top. When I first encountered this I assumed that tweaking the baselineOffset would allow me control over where the text is drawn. I was unable to change where the text is drawn by tweaking baselineOffset.
>
> My next attempt was to tweak the origin of the lineFragmentRect. That did move the line of text, but not in ways I expected it to. My thinking was that moving the origin.y 3 would move the text by 3. That does not appear to be the case.
>
> Based my reading of the docs it looks to me as if the changes I make in willSetLineFrag… are passed on to setLineFragmentRect:forGlyphRange:usedRect:baselineOffset:. During the implementation of setLineFrag… the layout manager must be called with setLocation:forStartOfGlyphRange:
Bill, I had a similar problem, and I handled it by overriding -paragraphSpacingBeforeGlyphAtIndex: withProposedLineFragmentRect:.
Ross
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