Re: drawGlyphsForGlyphRange layout issue
Re: drawGlyphsForGlyphRange layout issue
- Subject: Re: drawGlyphsForGlyphRange layout issue
- From: Graham Cox <email@hidden>
- Date: Sat, 22 Sep 2012 10:33:37 +1000
On 21/09/2012, at 8:54 PM, email@hidden wrote:
> The following is used to draw a glyph representing a tab character in an NSLayoutManager subclass.
You might investigate an alternative (and much easier) solution.
NSLayoutManager adopts the NSGlyphStorage protocol. That protocol declares a method, -layoutOptions, and one of the flags it can return is NSShowInvisibleGlyphs. Simply returning that flag may be all you need to do.
In fact I think this is set for you when you call -setShowsInvisibleCharacters:YES
I guess the difference is that it's all or nothing, which might be not the desired result.
Another approach is to override -showCGGlyphs:positions:count:font:matrix:attributes:inContext: which is the primitive drawing method. All of the positioning and context flippedness has been handled by this point, so you can usually just go ahead and draw the characters. Inserting some other glyph at this point for the tab should be straightforward.
--Graham
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