Re: Preventing View Update in NSTableView
Re: Preventing View Update in NSTableView
- Subject: Re: Preventing View Update in NSTableView
- From: Peter Lübke <email@hidden>
- Date: Thu, 14 Apr 2011 09:42:38 +0200
Am 14.04.2011 um 04:20 schrieb Graham Cox:
On 14/04/2011, at 10:13 AM, Peter Lübke wrote:
I'd like to temporarily 'freeze' the cells in the table view while
the data displayed in those cells are changed so they are not
continuously redrawn.
When the changes are completed, they should be updated at once.
This is what happens by default.
The redraws do not take place until the event loop completes, so if
all your changes are made within the event cycle, you'll only get
one redraw. If you are changing your data model one item per event
loop - which you'd have to go to a lot of trouble to accomplish -
then you'll get the table updating for each change.
This is of course true if the changes are made in the main thread.
I should have mentioned that I'm changing the data in separate worker
threads.
Actually, it's possible that there are several worker threads
changing data of different tables in different windows at the same
time, while the associated windows display attached sheets showing
progress. Permanently redrawing the tables's cells at this stage is
confusing and also undesirable for performance reasons.
Am I missing something I could override in my table view or array
controller?
Thanks,
Peter_______________________________________________
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