Graham,

Thanks so much for posting this. I’ve always wondered how to go about doing 
this kind of thing, but never had the actual need in a project to prod me to 
figure it out. Your app and code are terrific at making things clear.

Thanks,

Rob


> On May 7, 2015, at 11:54 PM, Graham Cox <graham....@bigpond.com> wrote:
> 
> 
>> On 8 May 2015, at 6:11 am, Jerry Krinock <je...@ieee.org> wrote:
>> 
>> I would like to subclass NSSlider to make it work like the "volume control" 
>> on a mid 19th-century radio receiver. That is, I want the minimum value to 
>> be at 7 o'clock, and the maximum value to be at 5 o'clock. 
> 
> 
> Jerry,
> 
> Since I found the problem interesting and also potentially useful for 
> something of my own down the track, I thought I’d have a quick go at making a 
> control like this.
> 
> It’s here: http://apptree.net/code/GCVolumeControl.zip
> 
> 
> It’s fairly basic, though it does what you want with the positioning and 
> stopping on tick marks, etc. I subclassed NSControl rather than NSSlider but 
> I kept some of the same method names so it’s easy to swap in. The knob itself 
> is just a PDF resource which I created using my own Artboard app (graphic and 
> original file included). Obviously you can change this to anything you like - 
> my quick and dirty image is likely a bit short of your needs.
> 
> Hopefully you find it useful, and at least having the source you can 
> customise it easily compared to standard classes. No licensing issues from me 
> either.
> 
> —Graham
> 
> 
> 
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