I would like to insert an image to a TreeView node label. I can't use the node's icon because it's already used for other purposes. The other solution would be the ability to have 2 icons per node.
I suggest to expand TreeNode by some Image SecondIcon property, add collection of them to your TreeView and then subscribe to TreeView.DrawNode event.
Here you can find some more hints and example: http://msdn.microsoft.com/en-us/library/system.windows.forms.treeview.drawnode.aspx.
Related
I am working on a windows form application, where I connect to the database and get a list of projects and sub-projects. I am able to show this as a treeview with checkboxes, that later an user can select to do further operations.
My problem is that, I can't set the Parent node state when one of the child nodes is selected. Here, I want some indication, if any of the child nodes is selected the parent node should fill in to show that something has been selected below that parent node.
Okay, meanwhile, I found answer to my problem. Not really wise but thanks to this Simple Tri-State TreeView control. code link here.
I will definitely try to build my own custom version of this. For now, this works fine.
I've done this before with a DataGridView, but is there some way to mask the visible TreeView nodes so that on a TextChanged event I can hide/filter nodes that do not contain the TextBox text? I have a lot of nodes.
Currently, this works, but it's a "remove only" function, doesn't add the nodes back if I delete some text from the textBox. Thanks in advance.
//Change in text will hide non matching nodes (remove only)
for (int i = 0; i<dirTree.Nodes.Count; i++)
{
if(!dirTree.Nodes[i].Text.Contains(custNameTB.Text))
{
dirTree.Nodes.RemoveAt(i);
}
}
Maybe keep a 'Master' node with all the nodes as children in memory. If there is no search text then just add that to the treeview. Then, if there is search text typed in, go thru the 'master' node and use it to create another filtered node (with the desired nodes as children) and add it to the treeview.
Basically you are just creating 2 collections on nodes. I with all the nodes (permanent) and another that just has copies of the desired node (transitory).
you could not make your node not visible (you have to add/remove it)
why
because how make a node visible and his child node visible it will be hard ( imagine ten nested node with 5 not ok..)
another solution is to store you treeview ( in a treeview you set not visible or in a datatable but more complicated) and have a treeview to display so if you remove node it is only on the duplicate treeview (the not visible treeview will stay and you will not lose nodes)
I have a Tree and load it recursively into my TreeView on my form. The problem is, I do not know how to find out which object in my Tree that I am selected on when I select a node in my TreeView. Any ideas?
You can set the TreeNode's Tag property to the corresponding instance from your object model.
The TreeView nodes (TreeNodes) have properties like Level, Tag, Text etc. The Level property lets you identify in which level is your TreeNode in the TreeView and the Tag and Text properties may let you identify your node uniquely. You may also add same kind of properties to your Tree too and thus you may compare them relevantly and do the conversion you require...
Hope this helps...
If you have a unique id for each record you can assign that id as the TreeNode.Name. TreeNode.Tag is another option.
i want to add the check box to the child node of a certain parent node in the tree view in my application...How should i add it?
TreeView has a property with the name CheckBoxes, if set to true, it shows checkboxes for all child nodes.
The TreeView API only allows you to add/remove checkboxes for EVERY node. If that's what you want, then the answer is easy - use the TreeView's CheckBoxes property.
If you want a checkbox for a particular node in the tree only, then it gets tricky. .NET doesn't directly support that. You can get the tree to accept it using Win32 message overrides, see the link below for a solution elsewhere:
http://dotnetfollower.com/wordpress/2011/05/winforms-treeview-hide-checkbox-of-treenode/
You can't show checkboxes only for some TreeNodes - only for all of them or none at all.
To enable the checkboxes for your tree set the CheckBoxes property to true.
I have a treeview control that functions like a folder browser.
Because loading the entire folder structer from disk is taking a lot of time i'm trying to load only one level at a time.
So i have a function that adds nodes for all the folders in the current node.
I thought that the best method would be to run it on the BeforeExpand event of the treeview.
UpdateTreeView(TreeView.SelectedNode);
is not working because clicking the + sign to expand is not selecting the node also.
So how to find the node that is expanding.
The BeforeExpand event should work. It has a TreeViewCancelEventArgs which contains a Node property. It is essentially the node being expanded.