On 13 Nov 2009, at 17:02, Corbin Dunn wrote:
>
> On Nov 13, 2009, at 8:19 AM, jonat...@mugginsoft.com wrote:
>
>>
>> On 13 Nov 2009, at 15:15, Corbin Dunn wrote:
>>
>>>
>>> On Nov 13, 2009, at 6:35 AM, jonat...@mugginsoft.com wrote:
>>>
>>>> I have a subclassed NSTextFieldCell to create a cell that draws outside of
>>>> it's frame.
>>>
>>> All the logic in tableview redraws things based on
>>> -frameOfCellAtColumn:row:. Things will frequently not get redrawn if you
>>> draw outside of those bounds.
>>>
>>> I recommend using a "full width" cell. See the AppKit release notes for 10.5
>> Unfortunately this won't work in this situation as my custom cell is only
>> drawing over the last half of the table width.
>>
>> I looked -frameOfCellAtColumn:row: but overriding it seems impracticable.
>>
>> It seems very weird that the problem pops up following an undo (it is a
>> coredata app though...).
>> Surely the NSTableColumn + NSCell won't know about the undo?
>>
>> I use the same cell subclass in an NSOutlineView of the same data and it
>> works fine.
>
> It works fine purely by chance! Plus, there are probably some cases where it
> doesn't update properly (and you just haven't noticed yet). If the table
> needs to redraw cell X at column Y, it will mark the area dirty via
> -frameOfCellAtColumn:Y row:X.
>
>> Would this and the fact that NSOutlineView is an NSTableView subclass tend
>> to indicate that I am screwing up somewhere?
>
> The error is having the cell draw outside of its given bounds. You need to
> change that (or else do the invalidation yourself, which will be difficult to
> get correct in all cases, unless you override frameOfCellAtColumn:row:.
> Simply adding a -setNeedsDisplay:YES to redraw everything is bad for
> performance).
>
Don't know what I was going on about before.
There is nothing impracticable about overriding -frameOfCellAtColumn:row:
In fact it's trivial.
And, more to the point, it works.
/*
frame of cell at column
*/
- (NSRect)frameOfCellAtColumn:(NSInteger)columnIndex row:(NSInteger)rowIndex
{
NSRect rect = [super frameOfCellAtColumn:columnIndex row:rowIndex];
if (columnIndex == EXTENDED_COLUMN_INDEX) {
NSCell *cell = [[[self tableColumns] objectAtIndex:columnIndex]
dataCell];
if ([cell isKindOfClass:[MGSEntryTextCell class]] &&
[(MGSEntryTextCell *)cell extendCell]) {
rect.size.width = [self frame].size.width -
rect.origin.x;
}
}
return rect;
}
Many thanks. I think that this would have eluded me without your input.
Jonathan
> --corbin
>
>
>
>
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