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Moving a TreView node (resequencing)

Posted on 2004-08-09
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Last Modified: 2012-08-14
I have a treeview with several items in it such as this...


Folder 1
     Item 1a
     Item 1b
     Item 1c
     Item 1d
Folder 2
     Item 2a
     Item 2b
     Item 2c
     Item 2d
Folder 3
     Item 3a
     Item 3b
     Item 3c
     Item 3d

Without using DRAG-DROP I want to resequence some items. I just want to take Item 3c and move it to be before item 3a.

I also want to be able to move items from one folder to another in the same way such as moving item 2c to be right after item 1c.

Now I can simply create a new node item in the new location and delete the old item. I am wondering if there is another way to resequence items in the tree without moving them. I can change the parent but that won't get the item in the right location (at least not from what I have read and tested).

So if you know the trick, let me know.

I need an answer really fast, otherwise I will get stuck doing the "Creat New then Delete" trick which I think is very ugly.
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Question by:schworak
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7 Comments
 
LVL 22

Expert Comment

by:DarkoLord
ID: 11754905
Well I don't think there is another way than creating new and deleting the old node...

Darko
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LVL 16

Expert Comment

by:JohnBPrice
ID: 11755996
If this is a big tree and you are resequencing a lot of nodes such as a quicksort or bubblesort, it will NOT be fast.  A faster alternative is to extract everything from the tree (into an array perhaps), resequence the array, blow away the tree and rebuild from your resequenced array.
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LVL 3

Author Comment

by:schworak
ID: 11756533
No, it is usually only a couple nodes that need to move in a large tree. So speed is not a consern. It is more of a pain because I have to take the existing node and change its key to a unique value, then create the new node with all the same attributes including the key. Then go back and delete the old node.

I was just hoping I could change its index or previous value. I can change the parent but that switches it to a new folder.

I will leave this open in the hopes that there is a solution.
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LVL 3

Author Comment

by:schworak
ID: 11822127
Here is the code that I came up with for anyone that also needs this tool. This is very fast! I am mainly using it to drag and drop nodes but I am also using it to sort segments of the tree as I need.



Public Function MoveNode(ByRef Tree As MSComctlLib.TreeView, ByRef SourceNode As MSComctlLib.Node, ByRef TargetNode As MSComctlLib.Node, ByVal InsertMode As Long) As MSComctlLib.Node
    '
    ' Move the source (and any child nodes) to the target using the
    ' specified insert mode which should be one of the following...
    '
    ' tvwChild          Make a child of the target
    ' tvwPrevious       Place before the target
    ' tvwNext           Place after the target
    '
    ' Returns a pointer to the new node in the new location
    '
    '
    Dim n As MSComctlLib.Node
    Dim ch1 As MSComctlLib.Node
    Dim ch2 As MSComctlLib.Node
    Dim k As String
   
    k = SourceNode.Key
    SourceNode.Key = ""
   
    Set n = Tree.Nodes.Add(TargetNode, InsertMode, k, SourceNode.Text, SourceNode.Image, SourceNode.SelectedImage)
    n.Expanded = SourceNode.Expanded
    n.ExpandedImage = SourceNode.ExpandedImage
    n.BackColor = SourceNode.BackColor
    n.Bold = SourceNode.Bold
    n.Checked = SourceNode.Checked
    n.ForeColor = SourceNode.ForeColor
    n.Sorted = SourceNode.Sorted
    n.EnsureVisible
   
    Set ch1 = SourceNode.Child
    If ch1 Is Nothing Then
        ' Do nothing
    Else
        Set ch1 = ch1.LastSibling
        Do Until ch1 Is Nothing
            Set ch2 = ch1.Previous
            Set ch1.Parent = n
            Set ch1 = ch2
        Loop
    End If
   
    Tree.Nodes.Remove SourceNode.Index
    Set Tree.DropHighlight = Nothing
    n.Selected = True
    Set MoveNode = n
End Function



I then call this function like this...

set NewNodeLocation = MoveNode(MyTree,DragNode,DropNode,tvwNext)
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