On Nov 21, 2012, at 8:22 PM, Graham Cox <[email protected]> wrote:

> The standard NSRulerMarker draws a black line in the client view as it is 
> dragged. This comes 'for free' but I wonder how on earth it works. There is 
> also no way to customise it that I can see. I'm wondering if this behaviour 
> is interfering with view updates in my client view, but since it's not 
> mentioned in the documentation I can only speculate. It seems to me 
> NSRulerMarker is set up for its use in NSTextView and though the design seems 
> to be fine for the more general case, in actual use the extra undocumented 
> behaviours baked into it for use in a text view make it hard to use and not 
> work as documented.
> 
> So, simple question: how can I keep an associated line in my client view 
> moving as I drag a ruler marker?

So the line should appear only while the user is dragging the marker? Maybe you 
should draw the line in a separate window rather than drawing in your client 
view. Just a thought.
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