Re: -outlineView:heightOfRowByItem: gets an item of NULL??
Re: -outlineView:heightOfRowByItem: gets an item of NULL??
- Subject: Re: -outlineView:heightOfRowByItem: gets an item of NULL??
- From: Mike Abdullah <email@hidden>
- Date: Thu, 21 Feb 2008 20:04:56 +0000
Although the docs don't mention it for this method, quite often an
item of nil is used to represent the tree's root object. I would
suggest therefore returning the default height of a table cell.
Mike.
On 21 Feb 2008, at 19:32, John Stiles wrote:
My outline view can occasionally get multi-line entries, so I've
implemented -outlineView:heightOfRowByItem: in the delegate.
Normally this works like a charm.
Now I'm working on some code to support dragging and dropping items
between one outline view and another outline view. (For what it's
worth, none of the items in this particular outline view are using a
nonstandard height in this case.) Suddenly, I've found that if I
start dragging items back and forth, after about ten tries or so, -
outlineView:heightOfRowByItem: is called with an item of "nil"!! I
haven't narrowed down a distinct pattern yet.
This causes an assertion to fire in my code because the first thing
I do is assert that [item isKindOfClass:[MyItem class]]. This
assertion hasn't ever gone off before.
Is it expected that this delegate method could occasionally be
called with a nil item?
As a workaround, should I just return [outlineView rowHeight] if I
get nil?
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