Re: Questions about NSPopupButtonCell and NSBrowser
Re: Questions about NSPopupButtonCell and NSBrowser
- Subject: Re: Questions about NSPopupButtonCell and NSBrowser
- From: Graham Cox <email@hidden>
- Date: Thu, 04 Jun 2015 10:29:48 +1000
> On 4 Jun 2015, at 10:20 am, Frank D. Engel, Jr. <email@hidden> wrote:
>
> I am wondering if the browser is actually caching an image of the cells in the second column when I switch away, then just displaying that without actually recreating the cells in the second column until it needs one of them for something? That might explain the behavior I am seeing, and may be a sensible optimization in most cases, but in this instance it is not very helpful for my particular application.
Sounds very doubtful.
[self controlView] is probably unreliable in your cell - you might want to check it. But even if it’s correct (being the NSMatrix for the browser column) invalidating the whole thing is going to be very sub-performant (though should work).
Note that NSBrowser, unlike a NSTableView, allocates one cell per row within a NSMatrix - it does not reuse and redisplay a single cell.
—Graham
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