Re: Cell in Selected NSTableView Not Redrawn
Re: Cell in Selected NSTableView Not Redrawn
- Subject: Re: Cell in Selected NSTableView Not Redrawn
- From: Keary Suska <email@hidden>
- Date: Sat, 21 Jul 2012 08:13:17 -0600
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"
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