Fwd: Table view data source methods order?
Fwd: Table view data source methods order?
- Subject: Fwd: Table view data source methods order?
- From: Chase Meadors <email@hidden>
- Date: Mon, 3 Aug 2009 14:02:24 -0500
From: Chase Meadors <email@hidden>
Date: August 3, 2009 2:01:57 PM CDT
To: Quincey Morris <email@hidden>
Subject: Re: Table view data source methods order?
Actually, and I forgot to mention this, I need number 1 because my
second column contains a mix of text cells and popup cells depending
on the data type.
And see my message I just forwarded to the list (I keep forgetting
to change the address to cocoa-dev when replying to people).
On Aug 3, 2009, at 1:27 PM, Quincey Morris wrote:
On Aug 3, 2009, at 1:04 AM, Chase Meadors wrote:
I'm having a bit of trouble here with table view data source
methods. I have implemented. I have these three:
1) - (NSCell *)tableView:(NSTableView *)sender
dataCellForTableColumn:(NSTableColumn *)tableColumn row:
(NSInteger)row;
2) - (id)tableView:(NSTableView *)sender objectValueForTableColumn:
(NSTableColumn *)tableColumn row:(NSInteger)row;
3) - (void)tableView:(NSTableView *)sender willDisplayCell:
(id)cell forTableColumn:(NSTableColumn *)tableColumn row:
(NSInteger)rowIndex;
I think you're making a mistake in expecting an order to be
guaranteed amongst mixed data source and delegate methods. Whatever
order you see now isn't guaranteed and could change in the future.
Your #2 is correctly implemented, so forget about it from the point
of view of the delegate methods.
Since you only have one NSPopUpButtonCell, you don't need both #1
and #3. And since you apparently do need #1, you can get rid of #3,
as Andy suggested.
Wherever you decide to set the menu for the current row, *that*
method should also set the selected item index in the menu. Then it
doesn't matter whether #2 is called before or after or at all.
There's no reason for the delegate method to rely on the data
source method to do its work for it.
You're not worrying about whether it's inefficient to recompute the
selected menu item index, are you? If so, you can be sure a posse
is going to be after you for "premature optimization". :)
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