Getting *my* object out of a tree controller?
Getting *my* object out of a tree controller?
- Subject: Getting *my* object out of a tree controller?
- From: Randall Meadows <email@hidden>
- Date: Thu, 5 Feb 2009 13:36:36 -0700
I have an NSOutlineView backed by an NSTreeController.
selectedObject = [[treeController selectedObjects] objectAtIndex:n]
gives me back an object (of the type) that I expect. However, when I
then try to find where that object lives in the tree
[treeView rowForItem:selectedObject]
returns -1 (not found). I ultimately need to remove the object from
the tree controller (using -removeObjectAtArrangedObjectIndexPath:
presumably), but how do I get an index path to an object when I have
*just* a pointer to that object? I can get an index path to the
selection, but in this case, the object to be deleted may not actually
be selected in the view. Based on the stuff I discovered below, I
assume I need to be searching for the tree node representation of my
object? How do I get that just from the object itself? Or do I need
to remember that tree node information at the same time I get a handle
to the object?
Thanks!
randy
-----
OK, I figured out the following part: NSTreeControllerTreeNode must be
a NSTreeNode, on which I can call -representedObject, which returns me
an object of the type I expect; I left the rest in here in case I'm
mistaken somehow, someone can set me straight.
Even when I query the tree controller directly for its items, I don't
get *my* object types back, but rather NSTreeControllerTreeNodes:
(gdb) po [treeView itemAtRow:1]
<NSTreeControllerTreeNode: 0x2a4a00>, child nodes {}
(gdb) po [treeView itemAtRow:0]
<NSTreeControllerTreeNode: 0x2d82b0>, child nodes {
0:<NSTreeControllerTreeNode: 0x2a4a00>, child nodes {}
1:<NSTreeControllerTreeNode: 0x2a4fb0>, child nodes {}
}
Not only can I not find any documentation on this type, I can't even
cmd-double-click or search to find *any* mention of it at all.
Casting that to my object type was an exercise in futility (what was
displayed was obviously not a valid object).
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