treenode

So I've looked around the web and a couple of questions here in stackoverflow here are the definition: Generally, an internal node is any node that is not a leaf (a node with no children) Non-leaf/Non-terminal/Internal node – has at least one child or descendant node with degree not equal to 0 As far as i understand it, it is a node which is not a leaf. I was about to conclude that the root is also an internal node but there seems to be some ambiguity on its definition as seen here: What is an "internal node" in a binary search tree? As the wonderful picture shows, internal nodes are nodes

How can I find out if the selected node is a child node or a parent node in the TreeView control? Exactly how you implement such a check depends on how you define "child" and "parent" nodes. But there are two properties exposed by each TreeNode object that provide important information: The Nodes property returns the collection of TreeNode objects contained by that particular node. So, by simply checking to see how many child nodes the selected node contains, you can determine whether or not it is a parent node: if (selectedNode.Nodes.Count == 0) { MessageBox.Show("The node does not have any

I've been trying to implement a directed force layout using a json file that I've written. Before I tried to make it begin with all nodes collapsed, it was working properly. I've declared a property called "index" for all the nodes, indicating which level of the tree they belong (root's index is 0, it's children are 1, etc.) I'm guessing that there is a problem with "index" property of the nodes because when I first start my page their values are correct, but when I collapse and re-open one a node the index values of related nodes change and it does not draw the links properly anymore. Any

I am working on a winform and on my UI there is a treeview, I found that the treenode will be highlighted even I did not click on the node by right mouse (eg, Node1 will be highlighted when I click on the following position), but i really do not like this behavior because I want to show a different context menu when I did not click on a treenode +RootNode |_ Node1 [ Right Click Here, Node1 will be highlighted] | |_ Node2 [ Right Click Here, Node2 will be highlighted] Going off of your comment to Kevin Wienhold's answer, you just want to allow the user to click in the empty space of the

I am trying to add a custom icon near the text of a TreeNode, so the items could have a "checked/unchecked" state displayed. I don't want to use a checkbox for that. Any ideas? Thanks Assuming you are using .net and Windows Forms. You must set DrawMode property of TreeView to TreeViewDrawMode.OwnerDrawAll. Once you do this, treeview's DrawNode event will fire each time a tree node is being drawn. Handle that event and draw your items manually. You will get DrawTreeNodeEventArgs as the event arguments. State property of it will tell you which state of the tree item you must draw. e.Bounds will

I have generic class of TreeNode: public class TreeNode<E> { public E key; public int num_of_children; public TreeNode<E> [] children; public TreeNode(int num_of_children) { this.num_of_children = num_of_children; children = new TreeNode[num_of_children];// Why not: new TreeNode<E>[num_of_children]? } public TreeNode<E> clone() { TreeNode<E> node = new TreeNode<E>(num_of_children); return node; } } When I try to do: children = new TreeNode<E> [num_of_children]; I get error. But "new TreeNode[num_of_children]" works. I read about type erasure, and I don't understand why TreeNode<E>[] doesn't

There is probably a really straightforward answer to this but I'm having difficulty finding it. Simple, I have a TreeNode and I would like to make its visibility false. (or another way of not allowing it to be shown until required). Edit - Another Question? I'm confused as to how there isn't a Visible attribute but then there is the property: Node.PrevVisibleNode; What is the difference between this and Node.PrevNode ? Thanks, I don't think you can do that. There is an IsVisible property, but it is readonly and will indicate whether the node is currently visible within the client area of the

I need to populate the TreeNode.ChildNodes on the event of TreeView.TreeNodeExpanded . The problem is the node is empty before the event gets fired and it is not expandable in this case and there is no expand icon [+] showed next to it. I want to make the node expandable in case its related object has some children without adding those children to the node. I thought about adding a virtual child to the node and delete it when it is expanded. Are there any better options ?? Thank you. Three steps to do the trick: 1 - Set the TreeView.ExpandDepth to 0 . This eliminates the expansion of the added