Snippet
// The ItemDrag event is called when the item drag begins. Here is // where you can perform any tracking, or validate if the drag // operation should occur, and so on. private void myTree_ItemDrag(object sender, ItemDragEventArgs e) { sourceNode = (TreeNode) e.Item; DoDragDrop(e.Item.ToString(), DragDropEffects.Move | DragDropEffects.Copy); } // Define the event that occurs while the dragging happens private void myTree_DragEnter(object sender, DragEventArgs e) { if (e.Data.GetDataPresent(DataFormats.Text)) { e.Effect = DragDropEffects.Move; else e.Effect = DragDropEffects.None; } } // Determine what node in the tree we are dropping on to (target), // copy the drag source (sourceNode), make the new node and delete // the old one. private void myTree_DragDrop(object sender, DragEventArgs e) { Point pos = myTree. PointToClient(new Point (e. X, e. Y)); TreeNode targetNode = myTree.GetNodeAt(pos); TreeNode nodeCopy; if (targetNode != null) { nodeCopy = new TreeNode (sourceNode. Text, sourceNode. ImageIndex, sourceNode. SelectedImageIndex); if (sourceNode.Index > targetNode.Index) targetNode.Parent.Nodes.Insert(targetNode.Index, nodeCopy); else targetNode.Parent.Nodes.Insert(targetNode.Index + 1, nodeCopy); sourceNode.Remove(); myTree.Invalidate(); } }
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