Re: Cocoa functionality analogous to ValidWindowRect?
Re: Cocoa functionality analogous to ValidWindowRect?
- Subject: Re: Cocoa functionality analogous to ValidWindowRect?
- From: Kurt Bigler <email@hidden>
- Date: Mon, 07 Nov 2005 00:00:17 -0800
on 11/5/05 6:35 AM, John C. Randolph <email@hidden> wrote:
> On Nov 3, 2005, at 1:58 PM, Kurt Bigler wrote:
>
>> I have not been able to find any functionality in NSView that
>> corresponds to
>> the carbon ValidWindowRect call, which marks a rectangular area as not
>> needing to be redrawn.
>
> There's nothing like this in Cocoa. A view's content is considered
> valid unless you send it a -setNeedsDisplay: or -
> setNeedsDisplayInRect: message.
I wonder whether this was just considered unnecessary functionality, or
whether it was omitted due to an actual design restriction. FWIW, I filed
an enhancement request for this:
rdar://4331722
on 11/5/05 8:41 AM, Chris Hanson <email@hidden> wrote:
> You won't be able to do this with AppKit directly. However, if
> there's a way to determine when your application objects are "done"
> invalidating and re-validating, you can implement your own system to
> track which rectangles should be updated. Then when the validations
> are complete, you can invoke -[NSView setNeedsDisplayInRect:] on your
> window's content view with an appropriate set of rectangles.
Thanks to both of you for the information and thoughts. There is also a
partly-implemented object-level invalidation system that doesn't use
rectangles at all, and finishing this may permit me to do something like
what Chris was suggesting.
-Kurt
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