using DevExpress.Utils;
using DevExpress.XtraGrid.Views.Grid;
using DevExpress.XtraGrid.Views.Grid.ViewInfo;
using DevExpress.XtraTreeList;
using DevExpress.XtraTreeList.Nodes;
using Lskj.Data;
using Lskj.Util;
using System;
using System.Collections.Generic;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Lskj.Control.Model
{
    public class GridDragTreeGrid
    {
        /// <summary>
        /// 拖动位置
        /// </summary>
        private GridHitInfo _hitInfo;
        /// <summary>
        /// 拖拽时节点
        /// </summary>
        private TreeListNode _beforeListNode;
        /// <summary>
        /// 拖动数据源
        /// </summary>
        private GridView _gridView;
        /// <summary>
        /// 拖动目标源
        /// </summary>
        private TreeList _treeListGrid;
        /// <summary>
        /// 是否正在拖拽
        /// </summary>
        private bool _draging = false;
        /// <summary>
        /// 拖拽条件与目标树选中节点数据进行替换比较
        /// </summary>
        public string isDragCond;
        /// <summary>
        /// 是否允许拖拽
        /// </summary>
        public bool isAllowDrag = true;
        /// <summary>
        /// 拖拽是否忽视节点（不忽视必须要推拽到节点上）
        /// </summary>
        public bool NeglectingNodes = false;
        /// <summary>
        /// 是否正在拖拽
        /// </summary>
        public bool Draging { get { return _draging; } set { _draging = value; } }
        public bool CanDragParentNode = false;
        public bool isDropColorVisble = false;
        /// <summary>
        /// 表格数据拖动完成
        /// </summary>
        public event GridDragTreeGridCompleteEventHandler OnDragComplete;

        public GridDragTreeGrid(GridView gridView, TreeList treeListGrid)
        {
            this._gridView = gridView;
            this._treeListGrid = treeListGrid;

            if (this._gridView == null || this._treeListGrid == null)
                return;

            this._gridView.MouseDown += new MouseEventHandler(gridView_MouseDown);
            this._gridView.MouseMove += new MouseEventHandler(gridView_MouseMove);
            this._gridView.MouseUp += new MouseEventHandler(gridView_MouseUp);
            //this._treeListGrid.HideSelection = false;
            this._treeListGrid.AllowDrop = true;
            this._treeListGrid.DragOver += new DragEventHandler(treeView_DragOver);
            this._treeListGrid.DragDrop += new DragEventHandler(treeView_DragDrop);
        }

        /// <summary>
        /// <para>说明：获取表格选中行数据</para>
        /// <para>创建人：龚宇超</para>
        /// <para>创建日期：2017-11-13 </para>
        /// <para>修改人：</para>
        /// <para>修改日期：</para>
        /// <para>修改备注：</para>
        /// <para>版本：1.0</para>
        /// </summary>
        /// <param name="rowHandles">The row handles.</param>
        /// <returns>DataRow[].</returns>
        private DataRow[] GetGridSelectRows(int[] rowHandles)
        {
            List<DataRow> rows = new List<DataRow>();

            foreach (int handle in rowHandles)
            {
                DataRow row = this._gridView.GetDataRow(handle);
                rows.Add(row);
            }

            return rows.ToArray();
        }
        /// <summary>
        /// <para>说明：GridView 鼠标按下</para>
        /// <para>创建人：龚宇超</para>
        /// <para>创建日期：2017-11-13 </para>
        /// <para>修改人：</para>
        /// <para>修改日期：</para>
        /// <para>修改备注：</para>
        /// <para>版本：1.0</para>
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="MouseEventArgs"/> instance containing the event data.</param>
        protected void gridView_MouseDown(object sender, MouseEventArgs e)
        {
            this._hitInfo = null;
            this._beforeListNode = null;

            if (System.Windows.Forms.Control.ModifierKeys != Keys.None) return;

            GridView gridView = sender as GridView;
            GridHitInfo hitInfo = gridView.CalcHitInfo(new Point(e.X, e.Y));
            if (e.Button == MouseButtons.Left && hitInfo.RowHandle >= 0)
            {
                this._draging = true;
                this._hitInfo = hitInfo;
                this._beforeListNode = this._treeListGrid.FocusedNode;
            }
        }
        /// <summary>
        /// <para>说明：鼠标移动</para>
        /// <para>创建人：龚宇超</para>
        /// <para>创建日期：2017-11-13 </para>
        /// <para>修改人：</para>
        /// <para>修改日期：</para>
        /// <para>修改备注：</para>
        /// <para>版本：1.0</para>
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="MouseEventArgs"/> instance containing the event data.</param>
        protected void gridView_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left && this._draging)
            {
                GridView gridView = sender as GridView;
                if (e.Button == MouseButtons.Left && this._hitInfo != null)
                {
                    Size dragSize = SystemInformation.DragSize;
                    Rectangle dragRect = new Rectangle(new Point(this._hitInfo.HitPoint.X - dragSize.Width / 2, this._hitInfo.HitPoint.Y - dragSize.Height / 2), dragSize);

                    if (!dragRect.Contains(new Point(e.X, e.Y)))
                    {
                        object row = gridView.GetRow(this._hitInfo.RowHandle);
                        gridView.GridControl.DoDragDrop(row, DragDropEffects.Move);
                        this._hitInfo = null;

                        DXMouseEventArgs.GetMouseArgs(e).Handled = true;
                    }
                }
            }
            else
            {
                this._draging = false;
            }
        }
        /// <summary>
        /// <para>说明：源表格鼠标放开</para>
        /// <para>创建人：龚宇超</para>
        /// <para>创建日期：2017-11-13 </para>
        /// <para>修改人：</para>
        /// <para>修改日期：</para>
        /// <para>修改备注：</para>
        /// <para>版本：1.0</para>
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="System.Windows.Forms.MouseEventArgs"/> instance containing the event data.</param>
        protected void gridView_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            this._draging = false;
        }
        /// <summary>
        /// <para>说明：</para>
        /// <para>创建人：龚宇超</para>
        /// <para>创建日期：2017-11-13 </para>
        /// <para>修改人：</para>
        /// <para>修改日期：</para>
        /// <para>修改备注：</para>
        /// <para>版本：1.0</para>
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="DragEventArgs"/> instance containing the event data.</param>
        protected void treeView_DragOver(object sender, DragEventArgs e)
        {
            if (e.KeyState == (int)Keys.LButton && this._draging)
            {
                TreeList treeListGrid = sender as TreeList;
                treeListGrid.Select();
                Point gcPoint = treeListGrid.PointToScreen((sender as TreeList).Location);
                Point pt = new Point(e.X - gcPoint.X, e.Y - gcPoint.Y);
                TreeListHitInfo _hitInfo = treeListGrid.CalcHitInfo(pt);
                

                if (NeglectingNodes)
                {
                    e.Effect = DragDropEffects.Move;
                    if (_hitInfo != null &&_hitInfo.Node!=null)
                    {
                        _hitInfo.Node.Expanded = true;
                    }
                }
                else 
                {
                    if (_hitInfo == null || treeListGrid.GetNodeIndex(_hitInfo.Node) < 0)
                    {
                        e.Effect = DragDropEffects.None;
                        return;
                    }
                    DataRowView dataRowView = this._treeListGrid.GetDataRecordByNode(_hitInfo.Node) as DataRowView;
                    DataRow Row = dataRowView != null ? dataRowView.Row : null;
                    bool isLastNode = _hitInfo.Node.Nodes.Count == 0;
                    if (!isLastNode)
                    {
                        _hitInfo.Node.Expanded = true; ;
                    }
                    DataRow[] rowItems = this.GetGridSelectRows(this._gridView.GetSelectedRows());
                    if (isLastNode || CanDragParentNode)
                    {
                        if (ReplaceHelper.ReplaceRowParamCond(Row, this.isDragCond) && isAllowDrag)
                        {
                            e.Effect = DragDropEffects.Move;
                            treeListGrid.FocusedNode = _hitInfo.Node;
                        }
                        else
                        {
                            e.Effect = DragDropEffects.None;
                        }
                    }
                    else
                    {
                        e.Effect = DragDropEffects.None;
                    }
                }
               
                
            }
        }
        /// <summary>
        /// <para>说明：</para>
        /// <para>创建人：龚宇超</para>
        /// <para>创建日期：2017-11-13 </para>
        /// <para>修改人：</para>
        /// <para>修改日期：</para>
        /// <para>修改备注：</para>
        /// <para>版本：1.0</para>
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="DragEventArgs"/> instance containing the event data.</param>
        protected void treeView_DragDrop(object sender, DragEventArgs e)
        {
            if (this.OnDragComplete != null && this._draging)
            {
                this._draging = false;
                TreeList treeListGrid = sender as TreeList;
                Point gcPoint = treeListGrid.PointToScreen((sender as TreeList).Location);
                Point pt = new Point(e.X - gcPoint.X, e.Y - gcPoint.Y);
                TreeListHitInfo _hitInfo = treeListGrid.CalcHitInfo(pt);
                TreeListNode treeNode = _hitInfo.Node;
                if (!NeglectingNodes) 
                {
                    
                    if (treeNode == null) return;
                    if (treeNode.Nodes.Count() > 0 && !CanDragParentNode)
                    {
                        MessageUtil.Show(string.Format(ResourceKeys.UnLastTreeNode, treeNode.GetDisplayText(treeListGrid.KeyFieldName)));
                        return;
                    }
                }
                   
                if (!e.Data.GetDataPresent(typeof(TreeNode)))
                {
                    if (OnDragComplete != null)
                    {
                        GridDragTreeGridArgs args = new GridDragTreeGridArgs();
                        args.GridViewObj = this._gridView;
                        args.TreeListObj = this._treeListGrid;
                        args.GridViewSelectRows = this.GetGridSelectRows(this._gridView.GetSelectedRows());
                        args.SelectTreeNode = treeNode;
                        args.BeforeTreeNode = this._beforeListNode;
                        OnDragComplete(sender, args);
                    }
                }
            }
        }
    }
}