TREEVIEW节点拖拽

http://files.cnblogs.com/xe2011/TreeView_Drag_and_Drop.rar

 

 

 

假设把A节点往B节点上拖拽

那么 

A 为Node1,B为Node2

 

 

       private void Form1_Load(object sender, EventArgs e)

        {

            treeView1.AllowDrop = true;

　　　　treeView1.HideSelection = false;

}

 

 

 

        private TreeNode node1 = null; //node1  当前选中的那个节点

        private void treeView1_ItemDrag(object sender, ItemDragEventArgs e)

        {  

            node1 = (TreeNode)e.Item;

             DoDragDrop(e.Item, DragDropEffects.Move);  

}

 

         private void treeView1_DragOver(object sender, DragEventArgs e)

        {

            TreeNode node2 = treeView1.GetNodeAt(treeView1.PointToClient(new Point(e.X, e.Y)));

            //节点2不存在

            //节点1 = 节点2

            //节点1 往它的父一级节点拖拽

            if ((node2 == null) || (node1 == node2) || (node1.Parent == node2))

            {

                treeView1.SelectedNode = node1;

                SetTreeNodeColorDefault();

                e.Effect = DragDropEffects.None;

                return;

            }

            else

            {

                e.Effect = DragDropEffects.Move;

                treeView1.SelectedNode = node2;

                SetTreeNodeColorBlue();

 

                //当一个父节点往它的子节点中拖拽时

                while (node2.Parent != null)

                {

                    if (node2.Parent == node1)

                    {

                        e.Effect = DragDropEffects.None;

                        return;

                    }

                    node2 = node2.Parent;

                }

            }

        }

 

         private void treeView1_DragDrop(object sender, DragEventArgs e)

        {

            TreeNode node2 = treeView1.GetNodeAt( treeView1.PointToClient(new Point(e.X, e.Y)) );

            if (node1 != node2)

            {

                if (node1.Parent != node2)

                {

                    textBox1.Text = textBox3.Text + "\\" + node1.FullPath;

                    textBox2.Text = textBox3.Text + "\\" + node2.FullPath;           

                    ///MessageBox.Show("Finished");

                    if (node1.Parent == null)

                        treeView1.Nodes.Remove(node1);

                    else

                        node1.Parent.Nodes.Remove(node1);

 

                    node2.Nodes.Add(node1);

                    node2.Expand();

                }

            }

}

 

//设置颜色部分

       private void treeView1_MouseDown(object sender, MouseEventArgs e)

        {

            SetTreeNodeColorDefault();

}

 

         private void SetTreeNodeColorBlue()

        {

            if (node1 != null)

            {

                node1.BackColor = Color.FromArgb(51, 153, 255);//蓝色 

                node1.ForeColor = Color.White;

            }

        }

 

 

       private void SetTreeNodeColorDefault()

        {

            if (node1 != null)

            {

                node1.BackColor = SystemColors.Window;

                node1.ForeColor = Color.Black;

            }

        }

 

 

 

 

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