Treeview check change

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  • =?Utf-8?B?bWFib25k?=
    #1

    Treeview check change

    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
    Tags: None
    • Jack Jackson
      #2
      Re: Treeview check change

      On Fri, 29 Feb 2008 12:55:01 -0800, mabond
      <mabond@discuss ions.microsoft. comwrote:
      >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

        Comment

        • Jack Jackson
          #3
          Re: Treeview check change

          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(n ode)

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

          Do While child IsNot Nothing Then
          child.Checked = True
          CheckChildren(c hild)
          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.


          On Fri, 29 Feb 2008 12:55:01 -0800, mabond
          <mabond@discuss ions.microsoft. comwrote:
          >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

            Comment

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