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Tip of the Day
Language: VB7
Expertise: Intermediate
Apr 28, 2003

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GetNodeRelationship - Evaluates the relationship between two treeview's nodes

' Returns a value >0 if node1 is a parent (or grandparent) of node2
' Returns a value <0 if node1 is a child (or grandchild) of node2
' in both cases the number reflects the number of levels between the two nodes
' Returns 0 if the two Nodes are the same or if they belong to different 
' subtrees

Function GetNodeRelationship(ByVal node1 As TreeNode, ByVal node2 As TreeNode) _
    As Integer
    If node1 Is node2 Then
        ' this is the simplest case
        Return 0
    ElseIf node1.FullPath.Length > node2.FullPath.Length Then
        ' if the two nodes belong to the same subtree,
        '  then node1 is a (grand)child of node2
        If node1.FullPath.IndexOf(node2.FullPath) = 0 Then
            ' do the loop only if the two nodes appear to belong to the same
            ' subtree check that the relationship really exists
            Do Until (node1.Parent Is Nothing)
                node1 = node1.Parent
                GetNodeRelationship = GetNodeRelationship - 1
                If node1 Is node2 Then Exit Function
            Loop
        End If
    Else
        ' if the two nodes belong to the same subtree,
        '  then node1 is a (grand)parent of node2
        If node2.FullPath.IndexOf(node1.FullPath) = 0 Then
            ' do the loop only if the two nodes appear to belong to the same
            ' subtree check that the relationship really exists
            Do Until (node2.Parent Is Nothing)
                node2 = node2.Parent
                GetNodeRelationship = GetNodeRelationship + 1
                If node1 Is node2 Then Exit Function
            Loop
        End If
    End If

    ' Nodes belong to different subtrees
    Return 0
End Function
Marco Bellinaso
 
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