I think dataForFormat(“items”)
or dataForFormat(“source”), not sure which is valid for Tree, might
give you the original items as opposed to the copies.
Matt
From: flexcoders@yahoogroups.com [mailto:flexcoders@yahoogroups.com] On Behalf Of Sean McKibben
Sent: Wednesday, July 06, 2005
1:17 PM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Reorder tree
via dragging
So I'm trying to make a tree which can reorder its nodes by
dragging
them. One of the things I wanted to do is prevent
a parent item from
being dragged on to any of its children, and to
show that during the
dragOver event.
In order to calculate whether the source is being
dragged on to any
of its offspring, I've been comparing the
event.dragSource.dataForFormat("treeItems")
first to
firstValue=event.target.getDropParent().getTreeNodeAt
(event.target.getDropLocation()) then recursively
to the parents of
firstValue.
This apparently doesn't work because dataForFormat
seems to hand me a
copy of the items being dragged instead of an
actual reference, so
the two values are never equal. I did note that
the items that
dataForFormat give me, do contain references to
the real parents,
data and other objects, it is just that the items
themselves are
copies for some reason.
What I ended up doing is something like the
following:
if(checkParentDrop(myowncustom.TreeUtils.findDataItemNode
(view.TemplateAssemblyTree,
dragItems[i].getData())
, event.target.getDropParent().getTreeNodeAt
(event.target.getDropLocation())))
action =
"">
private function checkParentDrop(source,
node):Boolean
{
if(source == node)
return true;
if(node.getParent()!=null)
return checkParentDrop(source, node.getParent());
else
return false;
}
public static function findDataItemNode(tree:mx.controls.Tree,
o:Object):TreeNode
... recursively check the entire tree for the same
getData()
reference ...
So basically instead of comparing items from
event.dragSource.dataForFormat("treeItems"),
i have to recursively
look them up by the reference they contain to
their getData()
information, to get the actual reference to the
TreeNode which I then
compare to the drop target and its ancestors for
referential equality.
This is horribly ugly, but it works. Is there a
better way that
people have stumbled across to validate
tree->self drags? I wish that
dataForFormat handed over references instead of
copies!
(sorry if this was discussed before; I'm
apparently bad at finding
previously discussed topics in this list!)
Sean
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