using DevExpress.XtraGrid.Views.Grid;
using System;
using System.Data;
using System.Drawing;
using System.Windows.Forms;

namespace HL_FristAidPlatform_Public
{
    public class UGridControl : DevExpress.XtraGrid.GridControl
    {
        private GridView gridView = null;
        private Point m_mouseDownLocation;
        private int m_dragHandle;
        private DragForm m_dragRowShadow;

        /// <summary>
        ///
        /// </summary>
        /// <param name="ev"></param>
        protected override void OnMouseDown(MouseEventArgs ev)
        {
            if (ev.Button == MouseButtons.Left)
            {
                if (gridView == null)
                {
                    gridView = ((GridView)base.MainView);
                }
                var _hit = gridView.CalcHitInfo(ev.Location);
                if (_hit.RowHandle >= 0)
                {
                    m_dragHandle = _hit.RowHandle;
                    m_mouseDownLocation = ev.Location;
                }
                else
                {
                    m_dragHandle = -1;
                }
            }
            base.OnMouseDown(ev);
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="ev"></param>
        protected override void OnMouseMove(MouseEventArgs ev)
        {
            if (ev.Button == MouseButtons.Left && m_dragHandle >= 0)
            {
                if (m_dragRowShadow == null)
                {
                    double _x2 = Math.Pow((ev.Location.X - m_mouseDownLocation.X), 2);
                    double _y2 = Math.Pow((ev.Location.Y - m_mouseDownLocation.Y), 2);
                    double _d2 = Math.Sqrt(_x2 + _y2);
                    if (_d2 > 3)
                    {
                        //执行拖拽；
                        this.BeginDrag(m_dragHandle);
                        //var _info = (DevExpress.XtraGrid.Views.Grid.ViewInfo.GridViewInfo)gv22.GetViewInfo();
                        //_info.GetGridRowInfo(0).CalcRectangle
                    }
                }
                else
                {
                    m_dragRowShadow.Location = new Point(m_dragRowShadow.Location.X, this.PointToScreen(ev.Location).Y);
                }
            }
            base.OnMouseMove(ev);
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="ev"></param>
        protected override void OnMouseUp(MouseEventArgs ev)
        {
            if (m_dragRowShadow != null)
            {
                var _hit = gridView.CalcHitInfo(ev.Location);
                this.EndDrag(_hit.RowHandle);
            }
            base.OnMouseUp(ev);
        }

        private void BeginDrag(int _handle)
        {
            try
            {
                var _info = (DevExpress.XtraGrid.Views.Grid.ViewInfo.GridViewInfo)gridView.GetViewInfo();
                //_info.GetGridRowInfo(0).CalcRectangle

                Rectangle _bound = _info.GetGridRowInfo(_handle).Bounds;
                _bound.Location = this.PointToScreen(_bound.Location);
                m_dragRowShadow = new HL_FristAidPlatform_Public.DragForm(_bound);
                m_dragRowShadow.Show();
            }
            catch
            {
            }
        }

        private void EndDrag(int _handle)
        {
            if (m_dragRowShadow != null)
            {
                m_dragRowShadow.Close();
                m_dragRowShadow.Dispose();
                m_dragRowShadow = null;

                int _rowIndex = gridView.GetDataSourceRowIndex(m_dragHandle);

                DataRow _row = ((DataTable)this.DataSource).Rows[_rowIndex];
                object[] _values = _row.ItemArray;

                base.BeginUpdate();

                //移除目标行；
                ((DataTable)this.DataSource).Rows.RemoveAt(m_dragHandle);
                _row = ((DataTable)this.DataSource).NewRow();
                _row.ItemArray = _values;
                if (_handle >= 0)
                {
                    //插入指定位置；
                    ((DataTable)this.DataSource).Rows.InsertAt(_row, _handle);
                    gridView.FocusedRowHandle = _handle;
                }
                else
                {
                    //添加；
                    ((DataTable)this.DataSource).Rows.Add(_row);
                    gridView.FocusedRowHandle = gridView.RowCount - 1;
                }

                base.EndUpdate();
            }
        }
    }

    /// <summary>
    ///
    /// </summary>
    public class DragForm : DevExpress.Utils.Win.TopFormBase
    {
        private Bitmap m_buff;
        private Graphics m_buffG;

        /// <summary>
        ///
        /// </summary>
        /// <param name="_size"></param>
        public DragForm(Rectangle _bound)
        {
            this.Text = "";
            this.FormBorderStyle = FormBorderStyle.None;
            this.ControlBox = false;
            this.Size = _bound.Size;
            this.ShowInTaskbar = false;
            this.StartPosition = FormStartPosition.Manual;

            this.Opacity = 0.8d; //TopFormBase已经有默认值了；

            m_buff = new Bitmap(_bound.Width, _bound.Height, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
            m_buffG = Graphics.FromImage(m_buff);
            m_buffG.CopyFromScreen(_bound.Location, new Point(0, 0), _bound.Size);

            this.BackgroundImageLayout = ImageLayout.None;
            this.BackgroundImage = m_buff;
            this.Location = _bound.Location;
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="e"></param>
        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            // e.Graphics.DrawImage(m_buff, 0, 0);
        }
    }
}