Re: Core Animation: Layer vs NSTextView

FROM : Stéphane Sudre
DATE : Thu Nov 01 23:34:19 2007

On jeudi, novembre 1, 2007, at 11:16  PM, Troy Stephens wrote:

> Hi Stéphane,
>
> 8 seconds seems anomalously long; I don't know what would cause that. 
> But the fade-in behavior is an essentially unavoidable artifact of the
> need to use CATiledLayers to back the document views of NSScrollViews,
> to allow them to potentially exceed the 2046x2046 texture size limit.


I think I will avoid the animation then (BTW, it's not a power of 2)

> For the transparency issue: Can you describe the containing view
> hierarchy and specify which other views (ancestors of the NSTextView
> in particular) have "wantsLayer" enabled for them?  This sounds worthy
> of a bug report.


The hierarchy is as "simple" as this:

NSWindow
  |
  +- ContentView (NSView?)
      |
      +- NSSplitView (thin separator used)
            |
            +- Custom View (Opaque subclass of NSView)
                |
                +- NSView
                      |
                      +- Custom View (Opaque subclass of NSView)
                            |
                            +- Custom View (subclass of NSView) (A)
                                  |
                                  +- ICBackgroundImageView  (subclass of
NSImageView) (B)
                                        |
                                        +- Custom View (subclass of
NSView)
                                              |
                                              +- ICScrollView (non
opaque subclass of NSScrollView)
                                                    |
                                                    +-
ICPresentationTextView (subclass of NSTextView)


The problem appears when I call setWantsLayer: on A or B for instance.