/******************************
* 说明：表格拖拽到树结构
* 创建人：龚宇超
* 创建日期：2017-11-13
* 修改人：
* 修改日期：
* 修改备注：
* 版本：1.0.0.0
******************************/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using DevExpress.XtraGrid.Views.Grid.ViewInfo;
using DevExpress.XtraGrid.Views.Grid;
using System.Windows.Forms;
using Lskj.Data;
using System.Drawing;
using DevExpress.Utils;
using System.Data;

namespace Lskj.Control.Model
{
    /// <summary>
    /// 表格拖拽到树结构
    /// </summary>
    public class GridDragTree : IDisposable
    {
        private bool _disposed;
        /// <summary>
        /// 拖动位置
        /// </summary>
        private GridHitInfo _hitInfo;
        /// <summary>
        /// 拖动数据源
        /// </summary>
        private GridView _gridView;
        /// <summary>
        /// 拖动目标源
        /// </summary>
        private TreeView _treeView;
        public bool CanDragParentNode = false;
        /// <summary>
        /// 表格数据拖动完成
        /// </summary>
        public event GridDragTreeCompleteEventHandler OnDragComplete;

        public GridDragTree(GridView gridView, TreeView treeView)
        {
            this._gridView = gridView;
            this._treeView = treeView;

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

            this._gridView.MouseDown += new MouseEventHandler(gridView_MouseDown);
            this._gridView.MouseMove += new MouseEventHandler(gridView_MouseMove);

            this._treeView.HideSelection = false;
            this._treeView.AllowDrop = true;
            this._treeView.DragOver += new DragEventHandler(treeView_DragOver);
            this._treeView.DragDrop += new DragEventHandler(treeView_DragDrop);
            if (this._gridView.GridControl != null)
            {
                this._gridView.GridControl.Disposed += OnOwnerDisposed;
            }
            this._treeView.Disposed += OnOwnerDisposed;
        }

        private void OnOwnerDisposed(object sender, EventArgs e)
        {
            Dispose();
        }

        /// <summary>
        /// 模块关闭时解除源表格和目标树的拖拽事件。
        /// </summary>
        public void Dispose()
        {
            if (_disposed) return;
            _disposed = true;

            if (_gridView != null)
            {
                _gridView.MouseDown -= gridView_MouseDown;
                _gridView.MouseMove -= gridView_MouseMove;
                if (_gridView.GridControl != null)
                {
                    _gridView.GridControl.Disposed -= OnOwnerDisposed;
                }
            }
            if (_treeView != null)
            {
                _treeView.DragOver -= treeView_DragOver;
                _treeView.DragDrop -= treeView_DragDrop;
                _treeView.Disposed -= OnOwnerDisposed;
            }

            OnDragComplete = null;
            _hitInfo = null;
            _gridView = null;
            _treeView = null;
        }
 

        /// <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;

            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._hitInfo = hitInfo;
            }
        }
        /// <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)
        {
            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;
                }
            }
        }
        /// <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)
        {
            TreeView treeView = sender as TreeView;
            treeView.Select();

            TreeNode treeNode = treeView.GetNodeAt(treeView.PointToClient(new Point(e.X, e.Y)));
            if (treeNode != null)
            {
                bool isLastNode = treeNode.Nodes.Count == 0;
                if (!isLastNode)
                {
                    treeNode.Expand();
                }

                DataRow[] rowItems = this.GetGridSelectRows(this._gridView.GetSelectedRows());

                if (isLastNode || CanDragParentNode)
                {
                    e.Effect = DragDropEffects.Move;
                    treeView.SelectedNode = treeNode;
                }
                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)
        {
            TreeView treeView = sender as TreeView;
            TreeNode treeNode = treeView.GetNodeAt(treeView.PointToClient(new Point(e.X, e.Y)));

            if (treeNode == null) return;
            if (treeNode.GetNodeCount(true) > 0 && !CanDragParentNode)
            {
                MessageUtil.Show(string.Format(ResourceKeys.UnLastTreeNode, treeNode.Text));
                return;
            }
            if (!e.Data.GetDataPresent(typeof(TreeNode)))
            {
                if (OnDragComplete != null)
                {
                    GridDragTreeArgs args = new GridDragTreeArgs();
                    args.GridViewObj = this._gridView;
                    args.TreeViewObj = this._treeView;
                    args.GridViewSelectRows = this.GetGridSelectRows(this._gridView.GetSelectedRows());
                    args.SelectTreeNode = treeNode;

                    OnDragComplete(sender, args);
                }
            }
        }
    }
}