On Jul 20, 2012, at 9:36 PM, Quincey Morris wrote:
> On Jul 20, 2012, at 19:03 , Keary Suska wrote:
>
>> In an NSTableView I am providing custom cells via
>> tableView:dataCellForTableColumn:row:, based on values represented in other
>> columns. The cell is usually determined when a value is specified via
>> NSPopupButtonCells in two other columns. When an effecting value is changed,
>> I call reloadDataForRowIndexes:columnIndexes: to refresh the cell(s) in
>> question. The problem is that even thought the delegate method is properly
>> called to return the changed NSCell, the NSTableView will not redraw the
>> cell until the row is deselected or is refreshed by some other means--such
>> as obscuring the tableview with another window or clicking in the cell (but
>> only when it's data cell is editable). I have also tried calling
>> setNeedsDisplayInRect:, but that doesn't work either.
>>
>> Oddly, it seems to work fine when called from an action method assigned to
>> the NSMenuItems level of a particular NSPopupButtonCell, but not when called
>> from an action method assigned to the NSPopupButtonCell itself. Although I
>> did try to specify the action for the individual NSMenuItems in the other
>> popup, but that didn't work either. The main difference between the two is
>> that one is specified via Interface Builder and the other is generated in
>> code.
>
>> - (IBAction)selectComparator:(id)sender
>> {
>> // clear operand
>> [[self clauseExpressionForRow:[queryTableView selectedRow]]
>> setOperand:[ClauseOperand nullOperand]];
>>
>> // comparator changes may change operand displays
>> [queryTableView reloadDataForRowIndexes:[NSIndexSet
>> indexSetWithIndex:[queryTableView selectedRow]] columnIndexes:[NSIndexSet
>> indexSetWithIndex:4]];
>> }
>
> So, to clarify, when it fails, are you saying:
>
> 1. It doesn't get to 'selectComparator:'.
No, it does.
> 2. It gets there, but 'dataCellForTableColumn:' doesn't get called for column
> 4 (at least, not until later, at the point where the row really redraws).
NSLog shows that the delegate method *is* called, and the expected data cell is
being returned for column 4.
> 3. It gets to 'dataCellForTableColumn:' for the right row/column combinations
> at the expected time, but the display just doesn't redraw.
Exactly.
> What happens if you simply 'reloadData' instead of trying to be specific,
> and/or what happens if you simply 'setNeedsDisplay:' instead of trying to be
> specific?
I tried reloadData, to no effect. I just tried the setNeedsDisplay: and that
didn't work either.
> Also, I notice that if '[queryTableView selectedRow]' isn't what you are
> expecting, when 'selectComparator:' is called, you'd get precisely the
> behavior you describe.
NSLogs show that it is returning expected values. I agree that it "feels" a
little fragile but I don't know what other options I have--doing this in the
setObjectValue delegate call seems even more fragile.
Curiously, the following workaround works:
Change reloadDataForRowIndexes to:
[self performSelector:@selector(refreshCellAtRect:) withObject:[NSValue
valueWithRect:[queryTableView frameOfCellAtColumn:4 row:[queryTableView
selectedRow]]] afterDelay:0.0];
With:
- (void)refreshCellAtRect:(NSValue *)rectValue;
{
[queryTableView setNeedsDisplayInRect:[rectValue rectValue]];
}
So there must be something with redraw and the event loop. Anyway, this almost
seems like a bug, but I wanted to be sure before I report it.
Keary Suska
Esoteritech, Inc.
"Demystifying technology for your home or business"
_______________________________________________
Cocoa-dev mailing list ([email protected])
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to [email protected]
