Re: TreeView Node Delete

Would anyone know of an efficient way to remove DisplayNode-type nodesfrom
a treeview? I am trying to simply code
DeleteTreeNode (node: DisplayNode)
Node.parent.FirstChild = node.NextSibling;
(DisplayNode)(Node.parent).UpdateFieldFromData;
Node = Nil;
However, this is not working...Node.Parent = NIL ;
The TreeView will figure out the rest.
=================================================
[email protected] Stephen Semeniuk
Sentai Advanced Research Corporation
The moving cursor writes, and having written, blinks on.

Geoffrey -
You may not even want to write this method, since the following line of
code will do just as well:
node.Parent = NIL;
As for the Related attribute, you can put anything you want in there; Forte
does not use that attribute for anything. I usually use the Related
attribute to reference the object that I am displaying. For example, if
the tree is displaying a corporate hierarchy, the Related attribute will
reference an Employee object.
I am not sure what you mean by a "profound performance issue", but if you
are concerned about storing as little data on the client as possible, there
is a useful technique. Do not load in data for nodes that you will not be
displaying, and then create nodes when they are needed to be displayed
(listen for the RequestFolderOpen event). You can also handle the
RequestFolderClose event, and then remove nodes that are not displayed.
However, you are best off to create some tests for different numbers of
nodes at different levels, and then see what the actual performance is.
There are many variables that will affect performance, so you will need to
construct a few simple scenarios. If the existing performance is
satisfactory for the amount of data you will be viewing, then there is no
need for additional optimizations.
I'm happy to give you further ideas on this.
Regards
CSB
At 10:47 AM 3/2/98 -0500, Geoffrey Whittington wrote:
Would anyone know of an efficient way to remove DisplayNode-type nodes from
a treeview? I am trying to simply code
DeleteTreeNode (node: DisplayNode)
Node.parent.FirstChild = node.NextSibling;
(DisplayNode)(Node.parent).UpdateFieldFromData;
Node = Nil;
However, this is not working...
Also: the attribute of 'Related' on a DisplayNode is of type Object. I
believe that it can reference any type of object. Can someone tell me if
there has been a known problem with using this attribute to contain
references to other allocated objects? Is there a profound performance
issue with a treeview with 200+ nodes?
Thanks!
Geoffrey Whittington
Software Engineer, Descartes Systems Group Inc.
[email protected]
(519)746-8110 x2333
Curtis Bragdon, Forte Consulting
[email protected]
Voice Mail: (510) 986-3807
Paging: (888) 687-6723
"I've seen dozens of triggering towns." - Richard Hugo

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According to your description, you'd like to move up or down the node in TreeView.
By reseraching, I found this post in StackOverFlow is similar with your issue.http://stackoverflow.com/questions/2203975/move-node-in-tree-up-or-down
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