Re: CATiledLayer tile invalidation

FROM : John Harper
DATE : Mon Mar 24 17:01:25 2008

No, there's no way to do that right now, CATiledLayer doesn't even 
know when tiles are evicted from the cache. Probably the best thing to 
do is to give your cache a maximum size and remove items after they've 
been idle for some time…

   John


On Mar 24, 2008, at 8:39 AM, Dmitry Pugachev wrote:

> I'm writing an application that dynamically renders
> contents into a large scrollable view, and I'm using
> a CATiledLayer object as a content layer.  It handles
> tiled drawing pretty well, but I also want to be able
> to synchronize it with my internal cache, which contains
> temporary data for each tile being rendered.
>
> While I can add content to this internal cache as I
> render individual tiles, I can't seem to be able to
> invalidate off-sceen portions of the cache when
> the corresponding portions of the internal CATiledLayer
> image buffer get invalidated.  For example, if I scroll
> down continuously, each new tile rendered would
> add data to my internal cache, while the old tiles
> will never get invalidated.  On the other hand, I want
> to be able to keep the cache size under control by
> removing old content, just like CATiledLayer does
> for its internal image data.
>
> Is there a way to register a callback that will be
> invoked by CATiledLayer when it internally
> invalidates an outdated portion of its content?
>
> Thanks in advance,
> Dmitry
> _______________________________________________
>
> Cocoa-dev mailing list (<email_removed>)
>
> Please do not post admin requests or moderator comments to the list.
> Contact the moderators at cocoa-dev-admins(at)lists.apple.com
>
> Help/Unsubscribe/Update your Subscription:
> http://lists.apple.com/mailman/options/cocoa-dev/<email_removed>
>
> This email sent to <email_removed>