There are various reasons why this happens; for one, the focus ring
may bleed into the rect that was invalidated. But, as you have
noticed, you should not rely on invalidating just a small portion
and hoping only that portion should redraw.
I think it is still correct to invalidate your cell's rect, and have
the table redraw (potentially redrawing everything).
OK, at least that confirms my observations - I'm not going mad after
all! (Or I might be, but not because of this...)
I think you should try another approach. Go back to invalidating the
rect of the cell that you want to redraw. Essentially, you want one
cell to maintain specific state while you are doing something else.
Exactly.
There is one easy approach to do this, which is to maintain a copy
of the cell while you are showing your special menu, and use that
cell to draw *just* that one particular row/column.
D'oh! Of course. A copy... obvious, now you point it out.
General steps:
1. Save off the row/column
2. Copy the cell at that row/column when showing your menu
3. Always return that copied cell from the delegate method:
- (NSCell *)tableView:(NSTableView *)tableView
dataCellForTableColumn:(NSTableColumn *)tableColumn row:
(NSInteger)row AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER;
else, return [tableColumn dataCell].
4. Don't update the properties for that row/column in -willdisplaycell
5. Update the colors of that copied cell when your menu changes state
6. Drop the copied cell when your menu goes away.
Another approach would be something similar to this great example:
Great, I'll give this a shot. Actually I woke up this morning thinking
that I'd need to do something along these lines (isolate the cell
being tracked), so sleeping on it really works - I definitely should
avoid these 16 hour straight coding sessions... I'll also check out
the suggested sample.
Thanks!
--Graham
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