NSScroller in layer backed view

[Ryan Joseph]

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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[jona...@mugginsoft.com]

On 3 Apr 2012, at 08:47, Ryan Joseph 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.

Are you sure that you haven't set any layers explicitly?
-drawRect should be called on all subviews when -wantsLayer is true.
When you create a layer hosting view (that is, assign a layer directly to the view) then -drawRect: will not be called.

Regards

Jonathan Mitchell
Mugginsoft LLP