1 private void treeView1_ItemDrag(object sender, ItemDragEventArgs e)
2 {
3 // Move the dragged node when the left mouse button is used.
4 if (e.Button == MouseButtons.Left)
5 {
6 DoDragDrop(e.Item, DragDropEffects.Move);
7 }
8
9 // Copy the dragged node when the right mouse button is used.
10 else if (e.Button == MouseButtons.Right)
11 {
12 DoDragDrop(e.Item, DragDropEffects.Copy);
13 }
14 }
15
16
17
18 // Set the target drop effect to the effect
19 // specified in the ItemDrag event handler.
20
21 private void treeView1_DragEnter(object sender, DragEventArgs e)
22 {
23 e.Effect = e.AllowedEffect;
24 }
25
26
27
28 // Select the node under the mouse pointer to indicate the
29 // expected drop location.
30 private void treeView1_DragOver(object sender, DragEventArgs e)
31 {
32 // Retrieve the client coordinates of the mouse position.
33 Point targetPoint = treeView1.PointToClient(new Point(e.X, e.Y));
34
35 // Select the node at the mouse position.
36 treeView1.SelectedNode = treeView1.GetNodeAt(targetPoint);
37 }
38
39
40
41 private void treeView1_DragDrop(object sender, DragEventArgs e)
42 {
43 // Retrieve the client coordinates of the drop location.
44 Point targetPoint = treeView1.PointToClient(new Point(e.X, e.Y));
45
46 // Retrieve the node at the drop location.
47 TreeNode targetNode = treeView1.GetNodeAt(targetPoint);
48
49 // Retrieve the node that was dragged.
50 TreeNode draggedNode = (TreeNode)e.Da
51
52 // Confirm that the node at the drop location is not
53 // the dragged node or a descendant of the dragged node.
54 if (!draggedNode.Equals(targetNode) && !ContainsNode(draggedNode, targetNode))
55 {
56 // If it is a move operation, remove the node from its current
57 // location and add it to the node at the drop location.
58 if (e.Effect == DragDropEffects.Move)
59 {
60 draggedNode.Remove();
61 targetNode.Nodes.Add(draggedNode);
62 }
63
64 // If it is a copy operation, clone the dragged node
65 // and add it to the node at the drop location.
66 else if (e.Effect == DragDropEffects.Copy)
67 {
68 targetNode.Nodes.Add((TreeNode)draggedNode.Clone());
69 }
70
71 // Expand the node at the location
72 // to show the dropped node.
73 targetNode.Expand();
74 }
75 }
76
77
78
79 // Determine whether on
80 // or ancestor of a second node.
81 private bool ContainsNode(TreeNode node1, TreeNode node2)
82 {
83 // Check the parent node of the second node.
84 if (node2.Parent == null) return false;
85 if (node2.Parent.Equals(node1)) return true;
86
87 // If the parent node is not null or equal to the first node,
88 // call the ContainsNode method recursively using the parent of
89 // the second node.
90 return ContainsNode(node1, node2.Parent);
91 }
92
93
94
95 //节点的遍历
96
97 //调用
98 TreeNodeCollection tc = treeView1.Nodes;
99 GetNode(tc);
100
101 public void GetNode(TreeNodeCollection tc)
102 {
103 foreach (TreeNode TNode in tc)
104 {
105 //操作TNode如获得TNode的相关属性
106 //
107 GetNode(TNode.Nodes);
108 }
109 }
110
111
评论