Treeview check change

[mabond]

I'm using a treeview control.
One parent node, several child nodes, several grandchild nodes.
Each of the nodes has a checkbox.

My question, when the user changes the check value of one of the grandchild
nodes to true how do I automatically change that node's parent to check-true
and so on up the tree.....and in reverse if the parent is changed to
check-false how do I cascade that down to each of the child nodes and their
child nodes.

Any help appreciated

Michael Bond

 

[Jack Jackson]

I'm using a treeview control.
One parent node, several child nodes, several grandchild nodes.
Each of the nodes has a checkbox.

My question, when the user changes the check value of one of the grandchild
nodes to true how do I automatically change that node's parent to check-true
and so on up the tree.....and in reverse if the parent is changed to
check-false how do I cascade that down to each of the child nodes and their
child nodes.

Any help appreciated

Michael Bond

 

[Jack Jackson]

Untested code. To modify the parents, use the Parent property.

Dim parent as TreeNode = node.Parent

Do While parent IsNot Nothing Then
parent.Checked = False
parent = parent.Parent
Loop

To go the other way, you need to recurse through all of the children:

CheckChildren(node)

Private Sub CheckChildren(node As TreeNode)
Dim child as TreeNode = node.FirstNode

Do While child IsNot Nothing Then
child.Checked = True
CheckChildren(child)
child = child.NextNode
Loop

End Sub

While that does what you asked, I'm not sure it is what you really
want. If you check a node, all of the children get set. But if you
uncheck one of those children, only the child's parents, grandparents,
etc. will be unchecked, not the child's siblings.