Re: drawing lines in and NSTextView
Re: drawing lines in and NSTextView
- Subject: Re: drawing lines in and NSTextView
- From: Graham Cox <email@hidden>
- Date: Sun, 01 Apr 2012 11:09:52 +1000
On 31/03/2012, at 11:08 PM, Koen van der Drift wrote:
> I have an NSTextView to which I want to add some lines that connect
> certain words. When the text changes, either by editing, or scrolling,
> that lines should follow the words. I thought about using
> CoreAnimation, but text in a CATextLayer does not appear to be
> editable like the text in an NSTextView (is that correct?). So, an
> alternative could be to override drawViewBackgroundInRect and use
> NSBezierPaths to draw my lines and I will work on that this weekend.
>
> Any thoughts or suggestions I may have overlooked?
Seems to me you're focusing on the wrong aspect of the problem. The key to this is to track given words' positions as the text is scrolled/reflowed. If you lay out the text yourself (using NSLayoutManager, for example) this is not hard, but if you leave it to something else, such as NSTextView, it may be a lot harder (though NSTextView has a NSLayoutManager of which you can ask questions).
Drawing the lines once you have those positions is relatively easy - NSBezierPaths will work, and are probably the simplest.
--Graham
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