Do not override drawRect:! Override the parts drawing methods:

– drawKnobSlotInRect:highlight:
– drawKnob

https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/ApplicationKit/Classes/NSScroller_Class/Reference/Reference.html

-raleigh


On Apr 3, 2012, at 12:47 AM, Ryan Joseph <r...@thealchemistguild.com> wrote:

> I've just started using CoreAnimation for fading views and simple things like 
> that but now I've run across a problem with NSScroller.
> 
> In a view which is layer backed (setWantsLayer is on) I have a NSScrollView 
> with a custom NSScroller subclass which performs drawing in drawRect:. When 
> the root views setWantsLayer is on the drawRect: method of the NSScroller 
> subclass is never called. The docs did say drawRect: will not be invoked in 
> layer backed views but I'm confused because another NSView subclass in the 
> same layer backed view is getting drawRect: invoked.
> 
> Either way, from what I know about CoreAnimation I probably need to make a 
> CALayer to replace the layer which (presumably) NSScroller is using since 
> drawRect: is not being invoked. However, making a new CALayer (setting it to 
> the NSScroller with setLayer) and overriding drawInContext: is not replacing 
> the original NSScroller drawing.
> 
> Does anyone know how I can acheive custom drawing of the NSScroller in the 
> layer backed view?
> 
> Thanks for any ideas you may have.
> 
> Regards,
>       Ryan Joseph
>       thealchemistguild.com
> 
> 
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