Re: Layer hosting custom NSView and setAlphaValue
Re: Layer hosting custom NSView and setAlphaValue
- Subject: Re: Layer hosting custom NSView and setAlphaValue
- From: Corbin Dunn <email@hidden>
- Date: Mon, 14 May 2012 11:21:03 -0700
On May 14, 2012, at 9:52 AM, Markus Spoettl <email@hidden> wrote:
> On 5/14/12 6:10 PM, Corbin Dunn wrote:
>>> I have a layer hosting custom view which I can't convince to listen to the
>>> alpha value I set on its superview. Other views sitting on the same
>>> superview correctly fade with the alpha value of the superview changing. My
>>> view doesn't. It simply hides when the superview's alpha is less than 1.
>>>
>>> Not sure what the problem is, the documentation for setAlphaValue doesn't
>>> tell me a lot, neither does the view programming guide.
>>>
>>> Any ideas?
>>
>> Hi Markus, It sounds like the parent view which you are setting the
>> alphaValue on is not layer backed, but you do apparently have a layer backed
>> child. That won't work; make the parent layer backed.
>
> Hi Corbin, thanks and sorry for not being clearer, this is my hierarchy:
>
> container (NSView)
> |
> - button 1 (NSButton)
> - button 2 (NSButton)
> - Custom View (NSView subclass, layer-hosting).
>
> I'm setting the container's alpha value, which fades both buttons, but not my layer hosting custom view.
Hi Markus,
That is what I thought you had as your hierarchy.
What I was saying is that you must set your container view to be layer backed (maybe even just temporarily, while your animation is happening).
The reason is that we use a separate CoreGraphics surface for the topmost view that hosts layers (all children views are implicitly made layer backed). Your top most view isn't layer backed, and we do a special alpha animation, which will not work with the Custom View you have made layer backed.
corbin
>
> My only guess is that there's something I need to do in my custom view but I have no idea what that is.
>
> Regards
> Markus
> --
> __________________________________________
> Markus Spoettl
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