DevExpress XtraTreeList 节点拖拽

来源：互联网发布：王兀中国好歌曲知乎编辑：程序博客网时间：2024/05/20 21:21
using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data;using DevExpress.XtraTreeList;using DevExpress.XtraTreeList.Nodes;namespace DragDropReorder {    /// <summary>    /// Summary description for Form1.    /// </summary>    public class Form1 : System.Windows.Forms.Form {        private DevExpress.XtraTreeList.TreeList treeList1;        /// <summary>        /// Required designer variable.        /// </summary>        private System.ComponentModel.Container components = null;        public Form1() {            //            // Required for Windows Form Designer support            //            InitializeComponent();            //            // TODO: Add any constructor code after InitializeComponent call            //        }        /// <summary>        /// Clean up any resources being used.        /// </summary>        protected override void Dispose( bool disposing ) {            if( disposing ) {                if (components != null) {                    components.Dispose();                }            }            base.Dispose( disposing );        }        #region Windows Form Designer generated code        /// <summary>        /// Required method for Designer support - do not modify        /// the contents of this method with the code editor.        /// </summary>        private void InitializeComponent() {            this.treeList1 = new DevExpress.XtraTreeList.TreeList();            ((System.ComponentModel.ISupportInitialize)(this.treeList1)).BeginInit();            this.SuspendLayout();            //             // treeList1            //             this.treeList1.Dock = System.Windows.Forms.DockStyle.Fill;            this.treeList1.Location = new System.Drawing.Point(0, 0);            this.treeList1.Name = "treeList1";            this.treeList1.Size = new System.Drawing.Size(422, 277);            this.treeList1.TabIndex = 0;            this.treeList1.CalcNodeDragImageIndex += new DevExpress.XtraTreeList.CalcNodeDragImageIndexEventHandler(this.treeList1_CalcNodeDragImageIndex);            this.treeList1.DragOver += new System.Windows.Forms.DragEventHandler(this.treeList1_DragOver);            this.treeList1.DragDrop += new System.Windows.Forms.DragEventHandler(this.treeList1_DragDrop);            //             // Form1            //             this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);            this.ClientSize = new System.Drawing.Size(422, 277);            this.Controls.Add(this.treeList1);            this.Name = "Form1";            this.Text = "Form1";            this.Load += new System.EventHandler(this.Form1_Load);            ((System.ComponentModel.ISupportInitialize)(this.treeList1)).EndInit();            this.ResumeLayout(false);        }        #endregion        /// <summary>        /// The main entry point for the application.        /// </summary>        [STAThread]        static void Main() {            Application.Run(new Form1());        }        private void Form1_Load(object sender, System.EventArgs e) {            new DevExpress.XtraTreeList.Design.XViews(treeList1);            treeList1.OptionsBehavior.DragNodes = true;        }        private DragDropEffects GetDragDropEffect(TreeList tl, TreeListNode dragNode) {            TreeListNode targetNode;            Point p = tl.PointToClient(MousePosition);            targetNode = tl.CalcHitInfo(p).Node;            if(dragNode != null && targetNode != null                 && dragNode != targetNode                && dragNode.ParentNode == targetNode.ParentNode)                return DragDropEffects.Move;            else                return DragDropEffects.None;        }        private void treeList1_DragOver(object sender, System.Windows.Forms.DragEventArgs e) {            TreeListNode dragNode = e.Data.GetData(typeof(TreeListNode)) as TreeListNode;            e.Effect = GetDragDropEffect(sender as TreeList, dragNode);        }        private void treeList1_DragDrop(object sender, System.Windows.Forms.DragEventArgs e) {            TreeListNode dragNode, targetNode;            TreeList tl = sender as TreeList;            Point p = tl.PointToClient(new Point(e.X, e.Y));                        dragNode = e.Data.GetData(typeof(TreeListNode)) as TreeListNode;            targetNode = tl.CalcHitInfo(p).Node;                        tl.SetNodeIndex(dragNode, tl.GetNodeIndex(targetNode));            e.Effect = DragDropEffects.None;        }        private void treeList1_CalcNodeDragImageIndex(object sender, DevExpress.XtraTreeList.CalcNodeDragImageIndexEventArgs e) {            TreeList tl = sender as TreeList;            if(GetDragDropEffect(tl, tl.FocusedNode) == DragDropEffects.None)                e.ImageIndex = -1;  // no icon            else                e.ImageIndex = 1;  // the reorder icon (a curved arrow)        }    }}
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