Automatically checking nodes using CheckBoxTriState in UltraTree

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Marko posted over 16 years ago

Does in UltraTree exist a property which, when set properly, can check nodes using CheckBoxTriState automatically?

For example, when I check the parent, all of its children are checked. And afterwards, when I uncheck a child, the parent

becomes semichecked. Also, when I uncheck all of the children, the parent becomes unchecked.

I have the knowledge to implement such an algorithm using recursion but it takes time,

and if UltraTree has one implemented and optimized, I would like to use that one.

If not, I think that such an algorithm should be implemented in the future.

Many thanks, Marko.

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Offline Mike Saltzman posted over 16 years ago

Hi Marko,
This functionality isn't built-in to the tree. But there is a KB article that should save you some time:
HOWTO:How do I automatically set a parent node's checked state based on whether none/some/all of its child nodes are checked?
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Offline Kevin Shaffer posted over 12 years ago in reply to Mike Saltzman

Hopefully this will help someone else who struggles with making this work. I needed to have all nodes be able to be checked, not just nodes who have no children. Also, parent nodes should appear as indeterminate when some (but not all) of their children are checked. However, when a user checks a node that is indeterminate, it needs to go back to switching between checked and unchecked. The following is the code I came up with:

private void treeView_AfterCheck(object sender,
                                 NodeEventArgs e)
{
  if (e.TreeNode.CheckedState !=
      CheckState.Indeterminate)
  {
    e.TreeNode.Override.NodeStyle =
      NodeStyle.CheckBox;

    foreach (UltraTreeNode childNode
             in e.TreeNode.Nodes)
    {
      childNode.CheckedState =
        e.TreeNode.CheckedState;
    }
  }
  if (e.TreeNode.Parent != null &&
      e.TreeNode.Parent.CheckedState !=
        e.TreeNode.CheckedState)
  {
    if (e.TreeNode.CheckedState ==
        CheckState.Indeterminate)
    {
      e.TreeNode.Parent.CheckedState =
        CheckState.Indeterminate;
    }
    else
    {
      bool indeterminate = false;
      foreach (UltraTreeNode siblingNode
               in e.TreeNode.ParentNodesCollection)
      {
        if (siblingNode.CheckedState !=
            e.TreeNode.CheckedState)
        {
          indeterminate = true;
          break;
        }
      }
      e.TreeNode.Parent.CheckedState =
        indeterminate ?
        CheckState.Indeterminate :
        e.TreeNode.CheckedState;
    }
  }
}
private void treeView_BeforeCheck(object sender,
                                  BeforeCheckEventArgs e)
{
  if (e.NewValue == CheckState.Indeterminate &&
      e.TreeNode.Override.NodeStyle !=
        NodeStyle.CheckBoxTriState)
  {
    e.TreeNode.Override.NodeStyle =
      NodeStyle.CheckBoxTriState;
  }
}

Sorry for having to keep the lines so short so the post fits