Re: NSMatrix Multi-Select
Re: NSMatrix Multi-Select
- Subject: Re: NSMatrix Multi-Select
- From: Ken Thomases <email@hidden>
- Date: Wed, 30 Jan 2008 09:22:24 -0600
Looking at the class docs, there's some ambiguity about the meaning of
"selected cell(s)". It seems that NSMatrix really only ever has one
selected cell. All of the other cells that you think of as selected
are actually just "highlighted". See the discussion for the
selectedCells method. It directly addresses your question.
In short, to add a single cell to the selection, call -[NSMatrix
highlightCell:atRow:column:].
If you need to change the selected cell but not alter the set of
"selected" cells, you'd need to save (copy) the result of
selectedCells, select the single cell you want, then iterate over the
previously selected cells and re-highlight them.
-Ken
On Jan 30, 2008, at 1:21 AM, Jiva DeVoe wrote:
Small update - I did find setSelectionFrom:to:anchor:highlight which
seems not to deselect the previous selection, but all this still
feels like a big nasty hack... so I'm still asking... is there a
better way to do what I want to do?
On Jan 30, 2008, at 12:01 AM, Jiva DeVoe wrote:
So I did a lot more research on this today...
And it turns out, it looks like NSMatrix IS multi-select by
default. The problem comes from the same issue this guy ran into:
http://www.cocoabuilder.com/archive/message/cocoa/2003/12/15/89691
Specifically, he wanted to implement drag and drop support (so do
I) - which from the looks of that email, means I have to implement
mouseDown: and then manually call selectCellAtRow:column. The
problem then is that selectCellAtRow:column appears to *deselect*
any previously selected cells, which means basically that by
implementing his solution for drag and drop, it basically breaks
multi-selection.
SO... I looked to see if I could find any methods that explicitly
said they do NOT deselect the previously selected cells, and I
couldn't find any. Can anyone suggest a good way to do this?
Again, what I want is an NSMatrix which allows multi-selection AND
drag-and-drop.
On Jan 29, 2008, at 8:02 AM, Jiva DeVoe wrote:
Hi,
I have a custom view which I have inherited from NSMatrix. Is
there an easy built-in way to make NSMatrix be allow multi-
selection? Or do I need to do some kind of hackery for it?
Thanks
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