Re: NSTextfield in tableColumn changing color slow
Re: NSTextfield in tableColumn changing color slow
- Subject: Re: NSTextfield in tableColumn changing color slow
- From: Steven Hamilton <email@hidden>
- Date: Sat, 18 Oct 2008 21:39:03 +1000
On 16/10/2008, at 11:59 PM, Corbin Dunn wrote:
Hi Steven,
On Oct 16, 2008, at 2:03 AM, Steven Hamilton wrote:
Hi Folks,
I have a core data bound tableColumn that displays a currency
balance. My NSManagedObject is a custom class that calculates the
balance from a @sum of related transactions and returns the
balance. The binding then displays this balance in the tableColumn.
So far so good. This works fast.
I've implemented the delegate method below to query the NSTextfield
value and change the color to red if it's less than 0. However,
when I implement this and scroll the table its slow and jerky.
Clearly I'm going about this the wrong way. How is it best to
change the color based on the value of the cell?
- (void)tableView:(NSTableView *)tableView willDisplayCell:(id)cell
forTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row;
This is a good way to do it. Do you have a sample to show the slow
down?
And/or what does your code do in this method?
Hmm, it appears its not this method slowing things down. It's my
balance method I've added to my account NSManagedobject subclass. The
balance method fetches all related transactions and tallies them up. I
think I need to work on some optimisation here or keep a static
balance that is updated when transactions change.
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