I needed drag 'n' drop facility in
TreeView control, which I guess is quite a common functionality. But I couldn't find it, so I implemented it.
Thinking it might be useful to other people, I am sharing the code here.
In this app, I have provided the functionality to add children or siblings to a node via toolbar.
Events that are required to be implemented are:
DragItem event, simply store the selected node that is the node to be dragged, in a
TreeNode type class variable & call
DoDragDrop as shown below:
NodeToBeDeleted = (TreeNode)e.Item;
string strItem = e.Item.ToString();
DoDragDrop(strItem, DragDropEffects.Copy | DragDropEffects.Move);
DragEnter, set appropriate effects.
DragDrop, do the following steps:
- Get the current mouse position, that is coordinates where to drop the dragged node.
PointToClient method of the
TreeView control to get the coordinates relative to the
- Get the node at this position (that is the node on which to drop the dragged node)
- Then delete the node dragged from its current position & insert it at the next index of the node at which to drop. That's it.
Position.X = e.X;
Position.Y = e.Y;
Position = treeView1.PointToClient(Position);
TreeNode DropNode = this.treeView1.GetNodeAt(Position);
if (DropNode != null && DropNode.Parent == this.NodeToBeDeleted.Parent )
TreeNode DragNode = this.NodeToBeDeleted;
Now the code is ready to be executed
I hope it helps u ppl. All the best.
Do give feedback on this article as positive criticism is always healthy for growth.
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