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need advice on subclassing NSScrollVIew

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need advice on subclassing NSScrollVIew

Subject: need advice on subclassing NSScrollVIew
From: John Reppy <email@hidden>
Date: Thu, 19 Mar 2009 15:39:44 -0500

I'm building a viewer for event logs that needs to support a wide range of scales (say from seconds/inch to nanoseconds/inch). I've got a custom subclass of NSView for displaying this information, which I want to embed in an NSScrollView. The problem that I'm faced with is that the floating-point coordinates used by Cocoa do not have enough precision at full magnification.

I'm guessing that the best solution is to subclass NSScrollView to track the visible rectangle's origin using doubles, but I'm not sure which NSScrollView methods I should be overriding. Also, do I need to override NSClipView too? Any pointers or suggestions would be appreciated.

Thanks in advance.

	- John

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