using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using System.Windows.Forms;
using System.Xml;

namespace Dongke.IBOSS.Basics.FlowSetting
{
    /// <summary>
    /// 流程设计器
    /// </summary>
    public partial class FlowBox : UserControl
    {
        #region 常量

        #region 事件

        private static readonly object EventNodeDoubleClick = new object();
        private static readonly object EventFlowNodeLoading = new object();

        #endregion 事件

        //private const Version CurrentVersion = new Version(1, 1);

        #endregion 常量

        #region 成员变量

        /// <summary>
        /// 流程项目绘制管理器
        /// </summary>
        private ItemManager _itemManager = null;
        /// <summary>
        /// 流程编辑模式
        /// </summary>
        private FlowBoxMode _flowBoxMode = FlowBoxMode.Edit;
        /// <summary>
        /// 加载流程的版本
        /// </summary>
        private Version _loadVersion = new Version(1, 1);
        /// <summary>
        /// 流程名称
        /// </summary>
        private string _flowName = null;
        #endregion 成员变量

        #region 构造函数

        /// <summary>
        /// 构造函数
        /// </summary>
        public FlowBox()
        {
            this.InitializeComponent();

            this._itemManager = new ItemManager(this, this.canvasBox);
            this.canvasBox.SetCanvasSize(Consts.CANVAS_SIZE_DEFAULT);
            this.canvasBox.CanvasControl.BackgroundImage = new Bitmap(this.GetType(), "Images.backImage1.gif");

            this.canvasBox.CanvasControl.MouseDown += this.flowCanvas_MouseDown;
            this.canvasBox.CanvasControl.MouseMove += this.flowCanvas_MouseMove;
            this.canvasBox.CanvasControl.MouseUp += this.flowCanvas_MouseUp;
            this.canvasBox.CanvasControl.Paint += this.flowCanvas_Paint;
            this.canvasBox.CanvasControl.MouseDoubleClick += this.flowCanvas_MouseDoubleClick;

            this.canvasBox.KeyControl.KeyDown += this.keyControl_KeyDown;
        }

        #endregion 构造函数

        #region 属性

        /// <summary>
        /// 流程名称
        /// </summary>
        public string FlowName
        {
            get
            {
                return this._flowName;
            }
            set
            {
                this._flowName = value;
            }
        }

        /// <summary>
        /// 加载流程的版本
        /// </summary>
        public Version LoadVersion
        {
            get
            {
                return this._loadVersion;
            }
        }

        /// <summary>
        /// 流程编辑模式
        /// </summary>
        public FlowBoxMode BoxMode
        {
            get
            {
                return this._flowBoxMode;
            }
            set
            {
                if (this._flowBoxMode != value)
                {
                    this._flowBoxMode = value;
                    this._itemManager.BoxMode = value;
                    this.ClearSelection();
                    // todo 
                }
            }
        }

        /// <summary>
        /// 获取或设置画布大小
        /// </summary>
        public Size CanvasSize
        {
            get
            {
                return this.canvasBox.CanvasSize;
            }
            set
            {
                this.canvasBox.SetCanvasSize(value);
                this._itemManager.RefreshItems();
            }
        }

        /// <summary>
        /// 获取或设置画布背景
        /// </summary>
        public Image CanvasBackgroundImage
        {
            get
            {
                return this.canvasBox.CanvasBackgroundImage;
            }
            set
            {
                this.canvasBox.CanvasBackgroundImage = value;
            }
        }

        /// <summary>
        /// 获取画布
        /// </summary>
        public Image CanvasImage
        {
            get
            {
                return this.canvasBox.CanvasImage;
            }
            //set
            //{
            //    this.canvasBox.CanvasImage = value;
            //}
        }

        /// <summary>
        /// 获取画布
        /// </summary>
        public Control CanvasControl
        {
            get
            {
                return this.canvasBox.CanvasControl;
            }
            //set
            //{
            //    this.canvasBox.CanvasImage = value;
            //}
        }

        /// <summary>
        /// 获取全部流程项目
        /// </summary>
        public List<FlowItem> Items
        {
            get
            {
                return this._itemManager.Items;
            }
        }

        /// <summary>
        /// 获取选择的流程项目
        /// </summary>
        public List<FlowItem> SelectedItems
        {
            get
            {
                return this._itemManager.SelectedItems;
            }
        }

        /// <summary>
        /// 获取删除的节点
        /// </summary>
        public List<FlowNode> DeletedNodes
        {
            get
            {
                return this._itemManager.DeletedNodes;
            }
        }

        /// <summary>
        /// 获取全部的节点（包括删除的）
        /// </summary>
        public List<FlowNode> AllNodes
        {
            get
            {
                return this._itemManager.AllNodes;
            }
        }

        ///// <summary>
        ///// 获取画板
        ///// </summary>
        //internal CanvasBox CanvasBox
        //{
        //    get
        //    {
        //        return this.canvasBox;
        //    }
        //}

        #endregion 属性

        #region 事件处理

        #region 画布事件

        /// <summary>
        /// 画布绘制
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void flowCanvas_Paint(object sender, PaintEventArgs e)
        {
            if (this._flowBoxMode == FlowBoxMode.Display)
            {
                return;
            }

            this.canvasBox.SetSmoothingMode(e.Graphics);
            //this._itemManager.RefreshActiveItems(e.Graphics);
            this._itemManager.RefreshMouseSelectRect(e.Graphics);
        }

        /// <summary>
        /// 鼠标按下
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void flowCanvas_MouseDown(object sender, MouseEventArgs e)
        {
            if (this._flowBoxMode == FlowBoxMode.Display)
            {
                return;
            }

            this._itemManager.MouseDown(e);
        }

        /// <summary>
        /// 鼠标移动
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void flowCanvas_MouseMove(object sender, MouseEventArgs e)
        {
            if (this._flowBoxMode == FlowBoxMode.Display)
            {
                return;
            }

            this._itemManager.MouseMove(e);
        }

        /// <summary>
        /// 鼠标抬起
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void flowCanvas_MouseUp(object sender, MouseEventArgs e)
        {
            if (this._flowBoxMode == FlowBoxMode.Display)
            {
                return;
            }

            this._itemManager.MouseUp(e);
        }

        /// <summary>
        /// 鼠标双击
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void flowCanvas_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            if (this._flowBoxMode == FlowBoxMode.Display)
            {
                return;
            }

            NodeDoubleClickEventHandler nodeDoubleClick = this.GetNodeDoubleClickEventHandler();
            if (nodeDoubleClick != null)
            {
                FlowNode node = this._itemManager.MouseDoubleClick(e);
                if (node != null)
                {
                    nodeDoubleClick(this, new NodeEventArgs(node));
                }
            }
        }

        #endregion 画布事件

        #endregion 事件处理

        #region 公有方法

        #region 新建项目

        /// <summary>
        /// 停止新建节点（鼠标操作）
        /// </summary>
        public void StopDrawingItem()
        {
            //if (this._flowBoxMode != FlowBoxMode.Edit)
            //{
            //    return;
            //}

            this._itemManager.StopDrawingItem();
        }

        /// <summary>
        /// 新建节点（鼠标操作，指定位置）
        /// </summary>
        public FlowNode DrawingNode()
        {
            if (this._flowBoxMode != FlowBoxMode.Edit)
            {
                return null;
            }

            return this._itemManager.DrawingNode();
        }

        /// <summary>
        /// 新建线段（鼠标操作，指定位置）
        /// </summary>
        public FlowLine DrawingLine()
        {
            if (this._flowBoxMode != FlowBoxMode.Edit)
            {
                return null;
            }

            return this._itemManager.DrawingLine();
        }

        /// <summary>
        /// 新建节点（默认位置）
        /// </summary>
        /// <returns>节点</returns>
        public FlowNode NewNode()
        {
            if (this._flowBoxMode != FlowBoxMode.Edit)
            {
                return null;
            }

            return this._itemManager.NewNode();
        }

        /// <summary>
        /// 新建节点（指定位置）
        /// </summary>
        /// <param name="location">节点位置</param>
        public FlowNode NewNode(Point location)
        {
            if (this._flowBoxMode != FlowBoxMode.Edit)
            {
                return null;
            }

            return this._itemManager.NewNode(location);
        }

        /// <summary>
        /// 新建线段（默认位置）
        /// </summary>
        /// <returns>线段</returns>
        public FlowLine NewLine()
        {
            if (this._flowBoxMode != FlowBoxMode.Edit)
            {
                return null;
            }

            return this._itemManager.NewLine();
        }

        /// <summary>
        /// 新建线段（指定位置）
        /// </summary>
        /// <param name="pointBegin">起始点</param>
        /// <param name="pointEnd">结束点</param>
        /// <returns>线段</returns>
        public FlowLine NewLine(Point pointBegin, Point pointEnd)
        {
            if (this._flowBoxMode != FlowBoxMode.Edit)
            {
                return null;
            }

            return this._itemManager.NewLine(pointBegin, pointEnd);
        }

        #endregion 新建项目

        #region 刷新项目

        /// <summary>
        /// 刷新Item的图片
        /// </summary>
        public void RefreshItems()
        {
            this._itemManager.RefreshItems();
        }

        #endregion 刷新项目

        #region 操作项目

        /// <summary>
        /// 全部不选择
        /// </summary>
        public void ClearSelection()
        {
            if (this._flowBoxMode == FlowBoxMode.Display)
            {
                return;
            }

            this._itemManager.ClearSelection();
            this._itemManager.RefreshItems();
        }

        /// <summary>
        /// 全部选择
        /// </summary>
        public void SelectAllItem()
        {
            if (this._flowBoxMode == FlowBoxMode.Display)
            {
                return;
            }

            this._itemManager.SelectAllItems();
            this._itemManager.RefreshItems();
        }

        /// <summary>
        /// 删除全部项目
        /// </summary>
        public void DeleteAllItem()
        {
            if (this._flowBoxMode != FlowBoxMode.Edit)
            {
                return;
            }

            this._itemManager.DeleteAllItems();
            this._itemManager.RefreshItems();
        }

        /// <summary>
        /// 删除选择项目
        /// </summary>
        public void DeleteSelectedItem()
        {
            if (this._flowBoxMode != FlowBoxMode.Edit)
            {
                return;
            }

            this._itemManager.DeleteSelectedItems();
            this._itemManager.RefreshItems();
        }

        /// <summary>
        /// 撤销删除
        /// </summary>
        /// <param name="nodeCode">节点编码</param>
        public void UndeleteNodeByNodeCode(string nodeCode)
        {
            foreach (FlowNode node in this._itemManager.DeletedNodes)
            {
                if (node.ItemCode == nodeCode)
                {
                    this._itemManager.DeletedNodes.Remove(node);
                    this._itemManager.Items.Add(node);
                    if (node.NodeState == FlowNodeState.Detached ||
                        node.NodeState == FlowNodeState.Added)
                    {
                        node.NodeState = FlowNodeState.Added;
                    }
                    else
                    {
                        node.NodeState = FlowNodeState.Unchanged;
                    }

                    return;
                }
            }
        }

        ///// <summary>
        ///// 对齐选定的节点
        ///// </summary>
        ///// <param name="arrangeType">对齐方式</param>
        //public void ArrangeNodes(ArrangeType arrangeType)
        //{
        //    this._itemManager.ArrangeNodes(arrangeType);
        //}

        ///// <summary>
        ///// 顶部对齐所有选中的节点
        ///// </summary>
        //public void ArrangeNodesTop()
        //{
        //    this._itemManager.ArrangeNodesTop();
        //}

        ///// <summary>
        ///// 底部对齐所有选中的节点
        ///// </summary>
        //public void ArrangeNodesBottom()
        //{
        //    this._itemManager.ArrangeNodesBottom();
        //}

        ///// <summary>
        ///// 左侧对齐所有选中的节点
        ///// </summary>
        //public void ArrangeNodesLeft()
        //{
        //    this._itemManager.ArrangeNodesLeft();
        //}

        ///// <summary>
        ///// 右侧对齐所有选中的节点
        ///// </summary>
        //public void ArrangeNodesRight()
        //{
        //    this._itemManager.ArrangeNodesRight();
        //}

        ///// <summary>
        ///// 垂直方向中心对齐所有选中的节点
        ///// </summary>
        //public void ArrangeNodesVerticalCenter()
        //{
        //    this._itemManager.ArrangeNodesVerticalCenter();
        //}

        ///// <summary>
        ///// 水平方向中心对齐所有选中的节点
        ///// </summary>
        //public void ArrangeNodesHorizontalCenter()
        //{
        //    this._itemManager.ArrangeNodesHorizontalCenter();
        //}

        #endregion 操作项目

        #region 流程校验

        /// <summary>
        /// 不完整的线
        /// </summary>
        private List<FlowLine> _incompleteLines = new List<FlowLine>();
        /// <summary>
        /// 全部线
        /// </summary>
        private List<FlowLine> _checkedLines = new List<FlowLine>();
        /// <summary>
        /// 独立的节点
        /// </summary>
        private List<FlowNode> _aloneNodes = new List<FlowNode>();
        /// <summary>
        /// 开始节点（包括前置节点是可以跳过的）
        /// </summary>
        private List<FlowNode> _beginNodes = new List<FlowNode>();
        /// <summary>
        /// 结束节点（包括后置节点是可以跳过的）
        /// </summary>
        private List<FlowNode> _endNodes = new List<FlowNode>();
        /// <summary>
        /// 中间节点
        /// </summary>
        private List<FlowNode> _generalNodes = new List<FlowNode>();
        /// <summary>
        /// 全部节点
        /// </summary>
        private List<FlowNode> _checkedNodes = new List<FlowNode>();

        /// <summary>
        /// 不完整的线（CheckFlow调用后）
        /// </summary>
        public List<FlowLine> IncompleteLines
        {
            get
            {
                return this._incompleteLines;
            }
        }
        /// <summary>
        /// 全部线（CheckFlow调用后）
        /// </summary>
        public List<FlowLine> CheckedLines
        {
            get
            {
                return this._checkedLines;
            }
        }
        /// <summary>
        /// 独立的节点（CheckFlow调用后）
        /// </summary>
        public List<FlowNode> AloneNodes
        {
            get
            {
                return this._aloneNodes;
            }
        }
        /// <summary>
        /// 开始节点（包括前置节点是可以跳过的）（CheckFlow调用后）
        /// </summary>
        public List<FlowNode> BeginNodes
        {
            get
            {
                return this._beginNodes;
            }
        }
        /// <summary>
        /// 结束节点（包括前置节点是可以跳过的）（CheckFlow调用后）
        /// </summary>
        public List<FlowNode> EndNodes
        {
            get
            {
                return this._endNodes;
            }
        }
        /// <summary>
        /// 中间节点（CheckFlow调用后）
        /// </summary>
        public List<FlowNode> GeneralNodes
        {
            get
            {
                return this._generalNodes;
            }
        }
        /// <summary>
        /// 全部节点（CheckFlow调用后）
        /// </summary>
        public List<FlowNode> CheckedNodes
        {
            get
            {
                return this._checkedNodes;
            }
        }

        /// <summary>
        /// 校验流程
        /// </summary>
        /// <returns></returns>
        public bool CheckFlow()
        {
            this._incompleteLines.Clear();
            this._checkedLines.Clear();
            this._beginNodes.Clear();
            this._endNodes.Clear();
            this._generalNodes.Clear();
            this._checkedNodes.Clear();

            //this.ErrorNodes.Clear();
            //this.ErrorMessages.Clear();

            bool checkResult = true;

            foreach (FlowItem item in this.Items)
            {
                if (item is FlowLine)
                {
                    FlowLine line = item as FlowLine;
                    if (line.AnchorBegin == AnchorKind.None ||
                        line.AnchorEnd == AnchorKind.None)
                    {
                        this._incompleteLines.Add(line);
                    }
                    this._checkedLines.Add(line);
                }

                if (item is FlowNode)
                {
                    FlowNode node = item as FlowNode;
                    node.PreNodes.Clear();
                    node.NextNodes.Clear();
                    this._checkedNodes.Add(node);

                    // 后续节点
                    this.SetNextNodes(node, null);

                    // 前置节点
                    this.SetPreNodes(node, null);

                    if (node.NodeType == FlowNodeType.Begin)
                    {
                        node.CheckedNodeType = FlowNodeType.Begin;
                        this._beginNodes.Add(node);
                    }
                    else if (node.NodeType == FlowNodeType.End)
                    {
                        node.CheckedNodeType = FlowNodeType.End;
                        this._endNodes.Add(node);
                        if (node.CanSkip)
                        {
                            checkResult = false;
                            //this.ErrorMessages.Add("结束节点不能跳过");
                        }
                    }
                    else if (node.NodeType == FlowNodeType.Alone)
                    {
                        node.CheckedNodeType = FlowNodeType.Alone;
                        this._aloneNodes.Add(node);
                    }
                    //else
                    {
                        bool isBegin = false;
                        bool isEnd = false;
                        foreach (FlowNode preNode in node.PreNodes)
                        {
                            if (preNode.NodeType == FlowNodeType.Begin &&
                                preNode.CanSkip)
                            {
                                isBegin = true;
                                break;
                            }
                        }
                        foreach (FlowNode nextNode in node.NextNodes)
                        {
                            if (nextNode.NodeType == FlowNodeType.End &&
                                nextNode.CanSkip)
                            {
                                isEnd = true;
                                break;
                            }
                        }

                        if (isBegin && isEnd)
                        {
                            node.CheckedNodeType = FlowNodeType.Alone;
                            this._aloneNodes.Add(node);
                        }
                        else if (isBegin)
                        {
                            node.CheckedNodeType = FlowNodeType.Begin;
                            this._beginNodes.Add(node);
                        }
                        else if (isEnd)
                        {
                            node.CheckedNodeType = FlowNodeType.End;
                            this._endNodes.Add(node);
                        }
                        else
                        {
                            node.CheckedNodeType = FlowNodeType.General;
                            this._generalNodes.Add(node);
                        }
                    }
                }
            }

            if (this._incompleteLines.Count > 0)
            {
                checkResult = false;
                //this.ErrorMessages.Add("有未完成的连接线");
            }

            if (this._beginNodes.Count == 0)
            {
                checkResult = false;
                //this.ErrorMessages.Add("没有开始节点");
            }

            if (this._endNodes.Count == 0)
            {
                checkResult = false;
                //this.ErrorMessages.Add("没有结束节点");
            }

            return checkResult;
        }

        #endregion 流程校验

        #region 保存、读取

        /// <summary>
        /// 清空流程
        /// </summary>
        public void ClearFlow()
        {
            //if (this._flowBoxMode != FlowBoxMode.Edit)
            //{
            //    return;
            //}

            this._flowName = null;
            this._itemManager = new ItemManager(this, this.canvasBox);
            //this.canvasBox.SetCanvasSize(Consts.CANVAS_SIZE_DEFAULT);
            //this.canvasBox.CanvasControl.BackgroundImage = new Bitmap(this.GetType(), "Images.backImage1.gif");
            this._itemManager.RefreshItems();
        }

        /// <summary>
        /// 保存流程（1.1）
        /// </summary>
        /// <returns>二进制</returns>
        public byte[] SaveFlow()
        {
            if (this._flowBoxMode == FlowBoxMode.Display)
            {
                return null;
            }

            using (MemoryStream memoryStream = new MemoryStream())
            {
                if (this.SaveFlow(memoryStream))
                {
                    return memoryStream.ToArray();
                }
            }
            return null;
        }

        /// <summary>
        /// 保存流程（1.1）
        /// </summary>
        /// <param name="stream">流</param>
        /// <returns>是否成功</returns>
        public bool SaveFlow(Stream stream)
        {
            if (this._flowBoxMode == FlowBoxMode.Display)
            {
                return false;
            }

            if (stream == null)
            {
                return false;
            }

            try
            {
                XmlDocument xmlDoc = this.SaveFlowXmlDoc();
                if (xmlDoc != null)
                {
                    xmlDoc.Save(stream);
                    return true;
                }
                return false;
            }
            catch
            {
                return false;
            }
        }

        /// <summary>
        /// 保存流程（1.1）
        /// </summary>
        /// <returns>XML</returns>
        public string SaveFlowXml()
        {
            if (this._flowBoxMode == FlowBoxMode.Display)
            {
                return null;
            }

            XmlDocument xmlDoc = this.SaveFlowXmlDoc();
            return xmlDoc.OuterXml;
        }

        /// <summary>
        /// 保存流程（1.1）
        /// </summary>
        /// <returns>XML</returns>
        public XmlDocument SaveFlowXmlDoc()
        {
            if (this._flowBoxMode == FlowBoxMode.Display)
            {
                return null;
            }

            return this.SaveFlowXmlDoc_1_1();
        }

        /// <summary>
        /// 加载流程
        /// </summary>
        /// <param name="bytes">二进制</param>
        /// <returns>是否成功</returns>
        public bool LoadFlow(byte[] bytes)
        {
            if (bytes != null && 0 < bytes.Length)
            {
                using (MemoryStream memoryStream = new MemoryStream(bytes))
                {
                    memoryStream.Position = 0;
                    return this.LoadFlow(memoryStream);
                }
            }

            return false;
        }

        /// <summary>
        /// 加载流程
        /// </summary>
        /// <param name="stream">流</param>
        /// <returns>是否成功</returns>
        public bool LoadFlow(Stream stream)
        {
            //this.ClearFlow();
            this._itemManager = new ItemManager(this, this.canvasBox);

            if (stream == null)
            {
                this._itemManager.RefreshItems();
                return false;
            }

            try
            {
                XmlDocument xmlDoc = new XmlDocument();
                xmlDoc.Load(stream);
                bool result = this.LoadFlowByVersion(xmlDoc);
                this._itemManager.RefreshItems();
                return result;
            }
            catch
            {
                this._itemManager.RefreshItems();
                return false;
            }
        }

        /// <summary>
        /// 加载流程
        /// </summary>
        /// <param name="xml">xml</param>
        /// <returns>是否成功</returns>
        public bool LoadFlow(string xml)
        {
            //this.ClearFlow();
            this._itemManager = new ItemManager(this, this.canvasBox);

            if (string.IsNullOrWhiteSpace(xml))
            {
                this._itemManager.RefreshItems();
                return false;
            }

            try
            {
                XmlDocument xmlDoc = new XmlDocument();
                xmlDoc.LoadXml(xml);
                bool result = this.LoadFlowByVersion(xmlDoc);
                this._itemManager.RefreshItems();
                return result;
            }
            catch
            {
                this._itemManager.RefreshItems();
                return false;
            }
        }

        #endregion 保存、读取

        #endregion 公有方法

        #region 内部方法

        #endregion 内部方法

        #region 受保护方法

        #endregion 受保护方法

        #region 私有方法

        #region 事件相关

        /// <summary>
        /// 获取节点双击的注册事件
        /// </summary>
        /// <returns></returns>
        private NodeDoubleClickEventHandler GetNodeDoubleClickEventHandler()
        {
            if (this._flowBoxMode < FlowBoxMode.LimitEdit)
            {
                return null;
            }

            return (NodeDoubleClickEventHandler)base.Events[FlowBox.EventNodeDoubleClick];
        }

        /// <summary>
        /// 流程节点加载时事件
        /// </summary>
        /// <returns></returns>
        private FlowNodeLoadingEventHandler GetFlowNodeLoadingEventHandler()
        {
            return (FlowNodeLoadingEventHandler)base.Events[FlowBox.EventFlowNodeLoading];
        }

        #endregion 事件相关

        #region 流程校验

        /// <summary>
        /// 设置前置节点
        /// </summary>
        /// <param name="node">需要设置的节点</param>
        /// <param name="preNodes">前置节点集合</param>
        private void SetPreNodes(FlowNode node, List<FlowNode> preNodes)
        {
            preNodes = (preNodes == null) ? node.PreNodes : preNodes;
            foreach (FlowLine inLine in node.InLines)
            {
                if (inLine.AnchorBegin != AnchorKind.None)
                {
                    FlowNode preNode = inLine.NodeBegin;
                    if (preNode != null && !preNodes.Contains(preNode))
                    {
                        preNodes.Add(preNode);
                        if (preNode.CanSkip)
                        {
                            this.SetPreNodes(preNode, preNodes);
                        }
                    }
                }
            }
        }

        /// <summary>
        /// 设置后续节点
        /// </summary>
        /// <param name="node">需要设置的节点</param>
        /// <param name="nextNodes">后续节点集合</param>
        private void SetNextNodes(FlowNode node, List<FlowNode> nextNodes)
        {
            nextNodes = (nextNodes == null) ? node.NextNodes : nextNodes;
            foreach (FlowLine outLine in node.OutLines)
            {
                if (outLine.AnchorEnd != AnchorKind.None)
                {
                    FlowNode nextNode = outLine.NodeEnd;
                    if (nextNode != null && !nextNodes.Contains(nextNode))
                    {
                        nextNodes.Add(nextNode);
                        if (nextNode.CanSkip)
                        {
                            this.SetNextNodes(nextNode, nextNodes);
                        }
                    }
                }
            }
        }

        #endregion 流程校验

        #region 保存、读取

        /// <summary>
        /// 保存流程（1.1）
        /// </summary>
        /// <returns>XML</returns>
        private XmlDocument SaveFlowXmlDoc_1_1()
        {
            XmlDocument xmlDoc = new XmlDocument();

            // 创建Xml声明部分，即<?xml version="1.0" encoding="utf-8" ?>
            xmlDoc.AppendChild(xmlDoc.CreateXmlDeclaration("1.0", "utf-8", null));
            // 根节点
            XmlNode root = xmlDoc.CreateElement("FlowSetting");
            // 版本
            XmlAttribute version = xmlDoc.CreateAttribute("Version");
            version.Value = "1.1";
            root.Attributes.Append(version);
            // 编码
            XmlAttribute managerCode = xmlDoc.CreateAttribute("ManagerCode");
            managerCode.Value = this._itemManager.ManagerCode;
            root.Attributes.Append(managerCode);
            // 新项目ID
            //XmlNode newItemID = xmlDoc.CreateElement("NewItemID");
            //newItemID.AppendChild(xmlDoc.CreateTextNode(this._itemManager.GetNewItemID().ToString()));
            //root.AppendChild(newItemID);
            XmlAttribute newItemID = xmlDoc.CreateAttribute("NewItemID");
            newItemID.Value = this._itemManager.GetNewItemID().ToString();
            root.Attributes.Append(newItemID);
            // 流程名称
            XmlNode flowName = xmlDoc.CreateElement("FlowName");
            flowName.AppendChild(xmlDoc.CreateCDataSection(this._flowName));
            root.AppendChild(flowName);
            // 画布大小
            XmlNode canvasSize = xmlDoc.CreateElement("CanvasSize");
            canvasSize.AppendChild(xmlDoc.CreateTextNode(Converter.ToXMLString(this.CanvasSize)));
            root.AppendChild(canvasSize);
            //// 画布背景
            //XmlNode backgroundImage = xmlDoc.CreateElement("BackgroundImage");
            //backgroundImage.Value = Converter.ToXMLString(this.CanvasBox.CanvasBackgroundImage);
            //backgroundImage.AppendChild(xmlDoc.CreateTextNode(Converter.ToXMLString(this.CanvasBox.CanvasBackgroundImage)));
            //flowNode.AppendChild(backgroundImage);

            // FlowItems
            XmlNode flowItems = xmlDoc.CreateElement("FlowItems");
            foreach (FlowItem item in this._itemManager.Items)
            {
                XmlNode flowItem = xmlDoc.CreateElement("FlowItem");
                // ItemID
                XmlAttribute itemID = xmlDoc.CreateAttribute("ItemID");
                itemID.Value = item.ItemID.ToString();
                flowItem.Attributes.Append(itemID);
                // OnlyCode
                XmlAttribute itemCode = xmlDoc.CreateAttribute("ItemCode");
                itemCode.Value = item.ItemCode;
                flowItem.Attributes.Append(itemCode);
                // ItemType
                XmlAttribute itemType = xmlDoc.CreateAttribute("ItemType");
                itemType.Value = item.GetType().Name;
                flowItem.Attributes.Append(itemType);
                // ID
                XmlNode id = xmlDoc.CreateElement("ID");
                id.AppendChild(xmlDoc.CreateTextNode(item.ID.ToString()));
                flowItem.AppendChild(id);
                // Code
                XmlNode code = xmlDoc.CreateElement("Code");
                code.AppendChild(xmlDoc.CreateCDataSection(item.Code));
                flowItem.AppendChild(code);
                // Name
                XmlNode name = xmlDoc.CreateElement("Name");
                name.AppendChild(xmlDoc.CreateCDataSection(item.Name));
                flowItem.AppendChild(name);
                // Remark
                XmlNode remark = xmlDoc.CreateElement("Remark");
                remark.AppendChild(xmlDoc.CreateCDataSection(item.Remark));
                flowItem.AppendChild(remark);
                // ShowName
                XmlNode showName = xmlDoc.CreateElement("ShowName");
                showName.AppendChild(xmlDoc.CreateTextNode(Converter.ToXMLString(item.ShowName)));
                flowItem.AppendChild(showName);
                // Font
                XmlNode font = xmlDoc.CreateElement("Font");
                font.AppendChild(xmlDoc.CreateTextNode(Converter.ToXMLString(item.Font)));
                flowItem.AppendChild(font);
                // FontColor
                XmlNode fontColor = xmlDoc.CreateElement("FontColor");
                fontColor.AppendChild(xmlDoc.CreateTextNode(Converter.ToXMLString(item.FontColor)));
                flowItem.AppendChild(fontColor);
                // TagSerializable todo object
                XmlNode ts = xmlDoc.CreateElement("TS");
                if (item.TagSerializable != null)
                {
                    using (MemoryStream memoryStream = new MemoryStream())
                    {
                        BinaryFormatter formatter = new BinaryFormatter();
                        formatter.Serialize(memoryStream, item.TagSerializable);
                        ts.AppendChild(xmlDoc.CreateTextNode(Convert.ToBase64String(memoryStream.ToArray())));
                    }
                }
                flowItem.AppendChild(ts);

                if (item is FlowNode)
                {
                    FlowNode node = item as FlowNode;
                    // Bounds
                    XmlNode bounds = xmlDoc.CreateElement("Bounds");
                    bounds.AppendChild(xmlDoc.CreateTextNode(Converter.ToXMLString(node.Bounds)));
                    flowItem.AppendChild(bounds);
                    // BorderWidth
                    XmlNode borderWidth = xmlDoc.CreateElement("BorderWidth");
                    borderWidth.AppendChild(xmlDoc.CreateTextNode(node.BorderWidth.ToString()));
                    flowItem.AppendChild(borderWidth);
                    // BorderColor
                    XmlNode borderColor = xmlDoc.CreateElement("BorderColor");
                    borderColor.AppendChild(xmlDoc.CreateTextNode(Converter.ToXMLString(node.BorderColor)));
                    flowItem.AppendChild(borderColor);
                    // FillColor
                    XmlNode fillColor = xmlDoc.CreateElement("FillColor");
                    if (node.FillColor.HasValue)
                    {
                        fillColor.AppendChild(xmlDoc.CreateTextNode(Converter.ToXMLString(node.FillColor)));
                    }
                    flowItem.AppendChild(fillColor);
                    // CanSkip
                    XmlNode canSkip = xmlDoc.CreateElement("CanSkip");
                    canSkip.AppendChild(xmlDoc.CreateTextNode(Converter.ToXMLString(node.CanSkip)));
                    flowItem.AppendChild(canSkip);
                    // NodeImageType
                    XmlNode nodeImageType = xmlDoc.CreateElement("NodeImageType");
                    if (node.NodeImageType.HasValue)
                    {
                        nodeImageType.AppendChild(xmlDoc.CreateTextNode(Converter.ToXMLString(node.NodeImageType)));
                    }
                    flowItem.AppendChild(nodeImageType);
                    // NodeImage
                    XmlNode nodeImage = xmlDoc.CreateElement("NodeImage");
                    if (!node.NodeImageType.HasValue && node.NodeImage != null)
                    {
                        nodeImage.AppendChild(xmlDoc.CreateTextNode(Converter.ToXMLString(node.NodeImage)));
                    }
                    flowItem.AppendChild(nodeImage);
                }

                if (item is FlowLine)
                {
                    FlowLine line = item as FlowLine;
                    // PointBegin
                    XmlNode pointBegin = xmlDoc.CreateElement("PointBegin");
                    pointBegin.AppendChild(xmlDoc.CreateTextNode(Converter.ToXMLString(line.PointBegin)));
                    flowItem.AppendChild(pointBegin);
                    // PointEnd
                    XmlNode pointEnd = xmlDoc.CreateElement("PointEnd");
                    pointEnd.AppendChild(xmlDoc.CreateTextNode(Converter.ToXMLString(line.PointEnd)));
                    flowItem.AppendChild(pointEnd);
                    // LineColor
                    XmlNode lineColor = xmlDoc.CreateElement("LineColor");
                    lineColor.AppendChild(xmlDoc.CreateTextNode(Converter.ToXMLString(line.LineColor)));
                    flowItem.AppendChild(lineColor);
                    // LineWidth
                    XmlNode lineWidth = xmlDoc.CreateElement("LineWidth");
                    lineWidth.AppendChild(xmlDoc.CreateTextNode(line.LineWidth.ToString()));
                    flowItem.AppendChild(lineWidth);
                    // AnchorBegin
                    XmlNode anchorBegin = xmlDoc.CreateElement("AnchorBegin");
                    if (line.NodeBegin == null)
                    {
                        line.AnchorBegin = AnchorKind.None;
                    }
                    else
                    {
                        anchorBegin.AppendChild(xmlDoc.CreateTextNode(line.NodeBegin.ItemCode));
                    }
                    XmlAttribute kindBegin = xmlDoc.CreateAttribute("Kind");
                    kindBegin.Value = Converter.ToXMLString(line.AnchorBegin);
                    anchorBegin.Attributes.Append(kindBegin);
                    flowItem.AppendChild(anchorBegin);
                    // AnchorEnd
                    XmlNode anchorEnd = xmlDoc.CreateElement("AnchorEnd");
                    if (line.NodeEnd == null)
                    {
                        line.AnchorEnd = AnchorKind.None;
                    }
                    else
                    {
                        anchorEnd.AppendChild(xmlDoc.CreateTextNode(line.NodeEnd.ItemCode));
                    }
                    XmlAttribute kindEnd = xmlDoc.CreateAttribute("Kind");
                    kindEnd.Value = Converter.ToXMLString(line.AnchorEnd);
                    anchorEnd.Attributes.Append(kindEnd);
                    flowItem.AppendChild(anchorEnd);
                }

                flowItems.AppendChild(flowItem);
            }

            root.AppendChild(flowItems);

            xmlDoc.AppendChild(root);

            return xmlDoc;
        }

        /// <summary>
        /// 根据文档版本加载流程
        /// </summary>
        /// <param name="xmlDoc">xml</param>
        /// <returns>是否成功</returns>
        private bool LoadFlowByVersion(XmlDocument xmlDoc)
        {
            bool result = false;

            // 根节点
            XmlNode root = xmlDoc.DocumentElement;
            if (root == null)
            {
                return result;
            }

            if ("WorkFlow" == root.Name)
            {
                this._loadVersion = new Version(1, 0);
                this.LoadFlow_1_0(root);
                result = true;
            }
            else if ("FlowSetting" == root.Name)
            {
                // 版本
                string version = root.Attributes["Version"].Value;

                switch (version)
                {
                    case "1.1":
                        this._loadVersion = new Version(1, 1);
                        this.LoadFlow_1_1(root);
                        result = true;
                        break;
                    default:
                        break;
                }
            }

            return result;
        }

        /// <summary>
        /// 加载流程（1.0）
        /// </summary>
        /// <param name="root">XML</param>
        private void LoadFlow_1_0(XmlNode root)
        {
            int itemCount = 0;

            //获取结点列表
            XmlNodeList xmlNodeChilds = root.SelectNodes("//arrNodeList//node");

            foreach (XmlNode xmlNode in xmlNodeChilds)
            {
                itemCount++;
                XmlNodeList xnl = xmlNode.ChildNodes;

                int index = Convert.ToInt32(xmlNode.Attributes.Item(0).InnerText);
                int nodetype = Convert.ToInt32(xmlNode.Attributes.Item(1).InnerText);
                //itemCount = Math.Max(itemCount, index);

                FlowNode node = new FlowNode(this._itemManager, index, Guid.NewGuid().ToString());
                node.NodeImageType = nodetype;
                node.Name = xnl.Item(0).InnerText;
                string fontname = xnl.Item(1).InnerText;
                int fontSize = Convert.ToInt32(xnl.Item(2).InnerText);
                node.Font = new System.Drawing.Font(fontname, fontSize);
                node.FontColor = System.Drawing.Color.FromArgb(int.Parse(xnl.Item(3).InnerText));
                node.BorderWidth = 0;
                node.BorderColor = Color.FromArgb(int.Parse(xnl.Item(4).InnerText));
                node.FillColor = Color.FromArgb(int.Parse(xnl.Item(5).InnerText));
                int height = Convert.ToInt32(xnl.Item(6).InnerText);
                int width = Convert.ToInt32(xnl.Item(7).InnerText);
                int x = Convert.ToInt32(xnl.Item(8).InnerText);
                int y = Convert.ToInt32(xnl.Item(9).InnerText);
                node.Bounds = new Rectangle(x, y, width, height);
                node.Remark = xnl.Item(17).InnerText;

                FlowNodeLoadingEventHandler flowNodeLoading = this.GetFlowNodeLoadingEventHandler();
                if (flowNodeLoading != null)
                {
                    flowNodeLoading(this, new NodeEventArgs(node));
                }

                this._itemManager.Items.Add(node);
                this._itemManager.AllNodes.Add(node);
            }

            //获取线列表
            XmlNodeList xmlLineChilds = root.SelectNodes("//arrLineList//line");
            foreach (XmlNode xmlLine in xmlLineChilds)
            {
                XmlNodeList xnl = xmlLine.ChildNodes;

                int index = Convert.ToInt32(xmlLine.Attributes.Item(0).InnerText);
                int lineType = Convert.ToInt32(xmlLine.Attributes.Item(1).InnerText);
                FlowLine line = new FlowLine(this._itemManager, ++itemCount, Guid.NewGuid().ToString());
                int x0 = Convert.ToInt32(xnl.Item(0).InnerText);
                int y0 = Convert.ToInt32(xnl.Item(1).InnerText);
                int x1 = Convert.ToInt32(xnl.Item(2).InnerText);
                int y1 = Convert.ToInt32(xnl.Item(3).InnerText);
                line.PointBegin = new Point(x0, y0);
                line.PointEnd = new Point(x1, y1);
                if (lineType == 1)
                {
                    //line.X2 = Convert.ToInt32(xnl.Item(4).InnerText);
                    //line.Y2 = Convert.ToInt32(xnl.Item(5).InnerText);
                    //line.X3 = Convert.ToInt32(xnl.Item(6).InnerText);
                    //line.Y3 = Convert.ToInt32(xnl.Item(7).InnerText);
                    //line.LineNodeCount = Convert.ToInt32(xnl.Item(8).InnerText);
                    if (xnl.Item(9).InnerText != "null")
                    {
                        int firstIndex = Convert.ToInt32(xnl.Item(9).InnerText);
                        line.NodeBegin = this._itemManager.Items[firstIndex] as FlowNode;
                        if (line.NodeBegin != null)
                        {
                            line.NodeBegin.OutLines.Add(line);
                            int index1 = Convert.ToInt32(xnl.Item(11).InnerText);
                            switch (index1)
                            {
                                case 0:
                                    line.AnchorBegin = AnchorKind.Top;
                                    line.NodeBegin.TopLines.Add(line);
                                    break;
                                case 1:
                                    line.AnchorBegin = AnchorKind.Left;
                                    line.NodeBegin.LeftLines.Add(line);
                                    break;
                                case 2:
                                    line.AnchorBegin = AnchorKind.Right;
                                    line.NodeBegin.RightLines.Add(line);
                                    break;
                                case 3:
                                    line.AnchorBegin = AnchorKind.Bottom;
                                    line.NodeBegin.BottomLines.Add(line);
                                    break;
                                default:
                                    break;
                            }
                        }
                    }
                    if (xnl.Item(10).InnerText != "null")
                    {
                        int secondIndex = Convert.ToInt32(xnl.Item(10).InnerText);
                        line.NodeEnd = this._itemManager.Items[secondIndex] as FlowNode;
                        if (line.NodeEnd != null)
                        {
                            line.NodeEnd.InLines.Add(line);
                            int index2 = Convert.ToInt32(xnl.Item(12).InnerText);
                            switch (index2)
                            {
                                case 0:
                                    line.AnchorEnd = AnchorKind.Top;
                                    line.NodeEnd.TopLines.Add(line);
                                    break;
                                case 1:
                                    line.AnchorEnd = AnchorKind.Left;
                                    line.NodeEnd.LeftLines.Add(line);
                                    break;
                                case 2:
                                    line.AnchorEnd = AnchorKind.Right;
                                    line.NodeEnd.RightLines.Add(line);
                                    break;
                                case 3:
                                    line.AnchorEnd = AnchorKind.Bottom;
                                    line.NodeEnd.BottomLines.Add(line);
                                    break;
                                default:
                                    break;
                            }
                        }
                    }
                    line.LineWidth = Convert.ToInt32(xnl.Item(13).InnerText);
                    line.LineColor = System.Drawing.Color.FromArgb(int.Parse(xnl.Item(14).InnerText));
                    line.Name = xnl.Item(15).InnerText;
                }
                else if (lineType == 0)
                {
                    //line.LineNodeCount = Convert.ToInt32(xnl.Item(4).InnerText);
                    if (xnl.Item(5).InnerText != "null")
                    {
                        int firstIndex = Convert.ToInt32(xnl.Item(5).InnerText);
                        line.NodeBegin = this._itemManager.Items[firstIndex] as FlowNode;
                        if (line.NodeBegin != null)
                        {
                            line.NodeBegin.OutLines.Add(line);
                            int index3 = Convert.ToInt32(xnl.Item(7).InnerText);
                            switch (index3)
                            {
                                case 0:
                                    line.AnchorBegin = AnchorKind.Top;
                                    line.NodeBegin.TopLines.Add(line);
                                    break;
                                case 1:
                                    line.AnchorBegin = AnchorKind.Left;
                                    line.NodeBegin.LeftLines.Add(line);
                                    break;
                                case 2:
                                    line.AnchorBegin = AnchorKind.Right;
                                    line.NodeBegin.RightLines.Add(line);
                                    break;
                                case 3:
                                    line.AnchorBegin = AnchorKind.Bottom;
                                    line.NodeBegin.BottomLines.Add(line);
                                    break;
                                default:
                                    break;
                            }
                        }
                    }
                    if (xnl.Item(6).InnerText != "null")
                    {
                        int secondIndex = Convert.ToInt32(xnl.Item(6).InnerText);
                        line.NodeEnd = this._itemManager.Items[secondIndex] as FlowNode;
                        if (line.NodeEnd != null)
                        {
                            line.NodeEnd.InLines.Add(line);
                            int index4 = Convert.ToInt32(xnl.Item(8).InnerText);
                            switch (index4)
                            {
                                case 0:
                                    line.AnchorEnd = AnchorKind.Top;
                                    line.NodeEnd.TopLines.Add(line);
                                    break;
                                case 1:
                                    line.AnchorEnd = AnchorKind.Left;
                                    line.NodeEnd.LeftLines.Add(line);
                                    break;
                                case 2:
                                    line.AnchorEnd = AnchorKind.Right;
                                    line.NodeEnd.RightLines.Add(line);
                                    break;
                                case 3:
                                    line.AnchorEnd = AnchorKind.Bottom;
                                    line.NodeEnd.BottomLines.Add(line);
                                    break;
                                default:
                                    break;
                            }
                        }
                    }
                    line.LineWidth = Convert.ToInt32(xnl.Item(9).InnerText);
                    line.LineColor = System.Drawing.Color.FromArgb(int.Parse(xnl.Item(10).InnerText));
                    line.Name = xnl.Item(11).InnerText;
                }

                this._itemManager.Items.Add(line);
            }


            // 新项目ID
            this._itemManager.SetNewItemID(itemCount);
            // 画布大小
            this.canvasBox.SetCanvasSize(Consts.CANVAS_SIZE_DEFAULT);
        }

        /// <summary>
        /// 加载流程（1.1）
        /// </summary>
        /// <param name="root">XML</param>
        private void LoadFlow_1_1(XmlNode root)
        {
            //// 根节点
            //XmlNode flowSetting = xmlDoc.SelectSingleNode("FlowSetting");
            //// 版本
            //string version = flowSetting.Attributes["Version"].Value;
            // 编码
            this._itemManager.ManagerCode = root.Attributes["ManagerCode"].Value;
            // 新项目ID
            //this._itemManager.SetNewItemID(Convert.ToInt32(root.SelectSingleNode("NewItemID").InnerText));
            this._itemManager.SetNewItemID(Convert.ToInt32(root.Attributes["NewItemID"].Value));
            // 流程名称
            this._flowName = root.SelectSingleNode("FlowName").InnerText;
            // 画布大小
            this.canvasBox.SetCanvasSize(Converter.ToObject<Size>(root.SelectSingleNode("CanvasSize").InnerText));
            //// 画布背景
            //XmlNode backgroundImage = flowSetting.SelectSingleNode("BackgroundImage");
            //this.canvasBox.CanvasControl.BackgroundImage = Converter.ToImage(backgroundImage.InnerText);

            // FlowItems
            XmlNode flowItems = root.SelectSingleNode("FlowItems");
            foreach (XmlNode item in flowItems.ChildNodes)
            {
                int itemID = Convert.ToInt32(item.Attributes["ItemID"].Value);
                string itemCode = item.Attributes["ItemCode"].Value;
                string itemType = item.Attributes["ItemType"].Value;
                object ts = null;
                XmlNode tsXmlNode = item.SelectSingleNode("TS");
                if (tsXmlNode != null && !string.IsNullOrWhiteSpace(tsXmlNode.InnerText))
                {
                    byte[] bytes = Convert.FromBase64String(tsXmlNode.InnerText);
                    using (MemoryStream memoryStream = new MemoryStream(bytes))
                    {
                        BinaryFormatter formatter = new BinaryFormatter();
                        ts = formatter.Deserialize(memoryStream);
                    }
                }

                if (typeof(FlowNode).Name == itemType)
                {
                    FlowNode node = new FlowNode(this._itemManager, itemID, itemCode);
                    node.ID = Convert.ToInt32(item.SelectSingleNode("ID").InnerText);
                    node.Code = item.SelectSingleNode("Code").InnerText;
                    node.Name = item.SelectSingleNode("Name").InnerText;
                    node.Remark = item.SelectSingleNode("Remark").InnerText;
                    node.ShowName = Converter.ToObject<bool>(item.SelectSingleNode("ShowName").InnerText);
                    node.Font = Converter.ToObject<Font>(item.SelectSingleNode("Font").InnerText);
                    node.FontColor = Converter.ToObject<Color>(item.SelectSingleNode("FontColor").InnerText);
                    node.TagSerializable = ts;
                    node.Bounds = Converter.ToObject<Rectangle>(item.SelectSingleNode("Bounds").InnerText);
                    node.BorderWidth = Convert.ToInt32(item.SelectSingleNode("BorderWidth").InnerText);
                    node.BorderColor = Converter.ToObject<Color>(item.SelectSingleNode("BorderColor").InnerText);
                    node.FillColor = Converter.ToObject<Color?>(item.SelectSingleNode("FillColor").InnerText);
                    node.CanSkip = Converter.ToObject<bool>(item.SelectSingleNode("CanSkip").InnerText);
                    node.NodeImageType = Converter.ToObject<int?>(item.SelectSingleNode("NodeImageType").InnerText);
                    if (!node.NodeImageType.HasValue)
                    {
                        node.NodeImage = Converter.ToImage(item.SelectSingleNode("NodeImage").InnerText);
                    }

                    FlowNodeLoadingEventHandler flowNodeLoading = this.GetFlowNodeLoadingEventHandler();
                    if (flowNodeLoading != null)
                    {
                        flowNodeLoading(this, new NodeEventArgs(node));
                    }

                    this._itemManager.Items.Add(node);
                    this._itemManager.AllNodes.Add(node);
                    continue;
                }

                if (typeof(FlowLine).Name == itemType)
                {
                    FlowLine line = new FlowLine(this._itemManager, itemID, itemCode);
                    line.ID = Convert.ToInt32(item.SelectSingleNode("ID").InnerText);
                    line.Code = item.SelectSingleNode("Code").InnerText;
                    line.Name = item.SelectSingleNode("Name").InnerText;
                    line.Remark = item.SelectSingleNode("Remark").InnerText;
                    line.ShowName = Converter.ToObject<bool>(item.SelectSingleNode("ShowName").InnerText);
                    line.Font = Converter.ToObject<Font>(item.SelectSingleNode("Font").InnerText);
                    line.FontColor = Converter.ToObject<Color>(item.SelectSingleNode("FontColor").InnerText);
                    line.TagSerializable = ts;
                    line.PointBegin = Converter.ToObject<Point>(item.SelectSingleNode("PointBegin").InnerText);
                    line.PointEnd = Converter.ToObject<Point>(item.SelectSingleNode("PointEnd").InnerText);
                    line.LineColor = Converter.ToObject<Color>(item.SelectSingleNode("LineColor").InnerText);
                    line.LineWidth = Convert.ToInt32(item.SelectSingleNode("LineWidth").InnerText);
                    XmlNode anchorBegin = item.SelectSingleNode("AnchorBegin");
                    line.AnchorBegin = Converter.ToObject<AnchorKind>(anchorBegin.Attributes["Kind"].Value);
                    if (line.AnchorBegin != AnchorKind.None)
                    {
                        line.NodeCodeBegin = anchorBegin.InnerText;
                    }
                    XmlNode anchorEnd = item.SelectSingleNode("AnchorEnd");
                    line.AnchorEnd = Converter.ToObject<AnchorKind>(anchorEnd.Attributes["Kind"].Value);
                    if (line.AnchorEnd != AnchorKind.None)
                    {
                        line.NodeCodeEnd = anchorEnd.InnerText;
                    }

                    this._itemManager.Items.Add(line);
                    continue;
                }
            }

            // 连接
            foreach (FlowItem item in this._itemManager.Items)
            {
                this.SetLineToNodeFromXml(item as FlowLine);
            }
        }

        /// <summary>
        /// 从xml加载流程后，把line链接到node上。
        /// </summary>
        /// <param name="line">线段</param>
        private void SetLineToNodeFromXml(FlowLine line)
        {
            if (line == null)
            {
                return;
            }

            bool hasC1 = false;
            bool hasC2 = false;
            if (line.AnchorBegin != AnchorKind.None || line.AnchorEnd != AnchorKind.None)
            {
                foreach (FlowItem item in this._itemManager.Items)
                {
                    FlowNode node = item as FlowNode;
                    if (node == null)
                    {
                        continue;
                    }

                    if (line.AnchorBegin != AnchorKind.None && node.ItemCode == line.NodeCodeBegin)
                    {
                        hasC1 = true;
                        line.NodeBegin = node;
                        node.OutLines.Add(line);
                        switch (line.AnchorBegin)
                        {
                            case AnchorKind.Top:
                                node.TopLines.Add(line);
                                break;
                            case AnchorKind.Left:
                                node.LeftLines.Add(line);
                                break;
                            case AnchorKind.Right:
                                node.RightLines.Add(line);
                                break;
                            case AnchorKind.Bottom:
                                node.BottomLines.Add(line);
                                break;
                            default:
                                break;
                        }
                    }

                    if (line.AnchorEnd != AnchorKind.None && node.ItemCode == line.NodeCodeEnd)
                    {
                        hasC2 = true;
                        line.NodeEnd = node;
                        node.InLines.Add(line);
                        switch (line.AnchorEnd)
                        {
                            case AnchorKind.Top:
                                node.TopLines.Add(line);
                                break;
                            case AnchorKind.Left:
                                node.LeftLines.Add(line);
                                break;
                            case AnchorKind.Right:
                                node.RightLines.Add(line);
                                break;
                            case AnchorKind.Bottom:
                                node.BottomLines.Add(line);
                                break;
                            default:
                                break;
                        }
                    }
                }

                if (!hasC1)
                {
                    line.AnchorBegin = AnchorKind.None;
                }
                if (!hasC2)
                {
                    line.AnchorEnd = AnchorKind.None;
                }
            }
        }

        #endregion 保存、读取

        #endregion 私有方法

        #region 事件声明

        /// <summary>
        /// 双击流程节点事件
        /// </summary>
        public event NodeDoubleClickEventHandler NodeDoubleClick
        {
            add
            {
                base.Events.AddHandler(FlowBox.EventNodeDoubleClick, value);
            }
            remove
            {
                base.Events.RemoveHandler(FlowBox.EventNodeDoubleClick, value);
            }
        }

        /// <summary>
        /// 流程节点加载时事件
        /// </summary>
        public event FlowNodeLoadingEventHandler FlowNodeLoading
        {
            add
            {
                base.Events.AddHandler(FlowBox.EventFlowNodeLoading, value);
            }
            remove
            {
                base.Events.RemoveHandler(FlowBox.EventFlowNodeLoading, value);
            }
        }
        #endregion 事件声明

        #region 键盘事件

        /// <summary>
        /// 键盘事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void keyControl_KeyDown(object sender, KeyEventArgs e)
        {
            if (this._flowBoxMode == FlowBoxMode.Display)
            {
                return;
            }

            switch(e.KeyCode)
            {
                case Keys.Escape:
                    //this._itemManager.StopDrawingItem();
                    break;
                case Keys.Up:
                    this._itemManager.MoveSelectedItems(0, -1);
                    break;
                case Keys.Left:
                    this._itemManager.MoveSelectedItems(-1, 0);
                    break;
                case Keys.Right:
                    this._itemManager.MoveSelectedItems(1, 0);
                    break;
                case Keys.Down:
                    this._itemManager.MoveSelectedItems(0, 1);
                    break;
                default:
                    return;
            }

            this._itemManager.RefreshItems();
        }

        private void contextMenu_Opening(object sender, System.ComponentModel.CancelEventArgs e)
        {
            e.Cancel = true;
        }

        private void tsmiAllSelect_Click(object sender, EventArgs e)
        {
            this.SelectAllItem();
        }

        private void tsmiDelete_Click(object sender, EventArgs e)
        {
            this.DeleteSelectedItem();
        }

        #endregion 键盘事件
    }
}