Re: NSTableView -reloadData is slow

[Richard Frith-Macdonald]

On Saturday, April 6, 2002, at 08:05 AM, Jonathan B. Leffert wrote:

> When I change a NSTableView's data source and call -reloadData on the 
> table
> view, it seems to take a second or two to actually reload the data.  
> It's a
> very noticible delay.
>
> Is there some timer firing in the background checking all views that are
> marked as dirty and redrawing them?  If so, what is the timer period?
>
> I'm on a fairly fast machine, so I don't think that's the problem.  I've
> also timed the rest of my code and it is all completing quickly.  The 
> table
> view just takes a while to update.

AFAIK there is no timer to perform updates, they are just done when an 
event is
received (the MacOS-X documentation/spec says this is done for each pass 
though
the event loop) ... so if there are no events, I guess the view doesn't 
get redrawn.

Under normal conditions, the window updating is the last thing done in 
the event
loop - so there is no code being called to mark a view as needing update 
until the
next event triggers some action anyway.  This is why no timer is needed.

It may be that you have managed to find some way in which you can call 
-reloadData
after the updating of windows has been done ... but that's just a 
guess.  I can't
think of any way to check it other than inserting debug logging 
statements into
the gui code and trying to see what happens - stepping through under gdb 
wouldn't help
as it would mess up the timing, changing conditions too much.