C#实现Dev Grid拖拽移动行的方法

本文实例讲述了C#实现Dev Grid拖拽移动行的方法。分享给大家供大家参考。具体如下：

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拖拽时带行截图效果

实现代码如下：

/// <summary>
/// 拖拽帮助类
/// </summary>
public static class DragHelper
{
  /// <summary>
  /// BandedGridView 拖拽
  /// </summary>
  /// <param name="gvMain"></param>
  public static void DragGridRow<T>(this BandedGridView gvMain)
  {
   // 拖拽遮罩控件
   DragMaster dragMaster = new DragMaster();
   // 当前拖拽行绘画区域
   Rectangle _DragRowRect = Rectangle.Empty;
   GridControl gcMain = gvMain.GridControl;
   GridHitInfo _DownHitInfo = null;
   //表格属性 允许拖拽
   gcMain.AllowDrop = true;
   gvMain.OptionsDetail.EnableMasterViewMode = false;
   #region 将对象拖至边界时发生 DragOver
   gcMain.DragOver += delegate(object sender, System.Windows.Forms.DragEventArgs e)
   {
    if (e.Data.GetDataPresent(typeof(T)))
     e.Effect = DragDropEffects.Move;
    else
     e.Effect = DragDropEffects.None;
   };
   #endregion
   #region 拖拽完成时处理数据 DragDrop
   gcMain.DragDrop += delegate(object sender, System.Windows.Forms.DragEventArgs e)
   {
    // 拖过来的新数据
    T newRow = (T)e.Data.GetData(typeof(T));
    // 原来在此坐标的数据
    // e的坐标是相对于屏幕的
    var clientPoint = gcMain.PointToClient(new Point(e.X, e.Y));
    GridHitInfo hitInfo = gvMain.CalcHitInfo(new Point(clientPoint.X, clientPoint.Y));
    var oldRow = (T)gvMain.GetRow(hitInfo.RowHandle);
    // 如果相等则不处理
    if (oldRow == null || newRow == null) return;
    // 且目标位置不是最后一行的话要将所有序号重排
    // 原来的行号
    var oldIndex = _DownHitInfo.RowHandle;
    // 新的行号
    var newIndex = hitInfo.RowHandle;
    BindingSource bs = (BindingSource)(gcMain.DataSource);
    if (bs == null)
     return;
    bs.RemoveAt(oldIndex);
    bs.Insert(oldIndex, oldRow);
    bs.RemoveAt(newIndex);
    bs.Insert(newIndex, newRow);
    bs.ResetBindings(false);
   };
   #endregion
   #region 鼠标按下 MouseDown
   gcMain.MouseDown += delegate(object sender, MouseEventArgs e)
   {
    _DownHitInfo = null;
    GridHitInfo hitInfo = gvMain.CalcHitInfo(new Point(e.X, e.Y));
    if (Control.ModifierKeys != Keys.None) return;
    if (e.Button == MouseButtons.Left && hitInfo.RowHandle >= 0)
    {
     // 禁用的Grid不支持拖拽
     if (!gvMain.OptionsBehavior.Editable
      || gvMain.OptionsBehavior.ReadOnly)
      return;
     // 只有点击最前面才能拖拽
     if (hitInfo.InRowCell)
      return;
     // 缓存
     _DownHitInfo = hitInfo;
    }
   };
   #endregion
   #region 鼠标移动 MouseMove
   gcMain.MouseMove += delegate(object sender, MouseEventArgs e)
   {
    if (e.Button == MouseButtons.Left)
    {
     if (_DownHitInfo != null)
     {
      Size dragSize = SystemInformation.DragSize;
      // 偏离区域
      Rectangle dragRect = new Rectangle(new Point(_DownHitInfo.HitPoint.X - dragSize.Width / 2, _DownHitInfo.HitPoint.Y - dragSize.Height / 2), dragSize);
      if (!dragRect.Contains(new Point(e.X, e.Y)))
      {
       // 屏幕坐标
       var p = gcMain.PointToScreen(e.Location);
       // 刷新是必须要的
       gcMain.Refresh();
       // 获取当前行截图
       var bmp = GetDragRowImage(gcMain, _DownHitInfo, _DragRowRect);
       Point offSetPoint = new Point(p.X + 1, p.Y - dragMaster.DragSize.Height / 2);
       // 开始显示拖拽遮罩
       dragMaster.StartDrag(bmp, offSetPoint, DragDropEffects.Move);
       // 获取要拖拽的数据
       object row = gvMain.GetRow(_DownHitInfo.RowHandle);
       // 开始拖拽
       gcMain.DoDragDrop(row, DragDropEffects.Move);
       // 取消事件
       DevExpress.Utils.DXMouseEventArgs.GetMouseArgs(e).Handled = true;
       // 清空缓存
       _DownHitInfo = null;
      }
     }
    }
   };
   #endregion
   #region 在用鼠标拖动某项时发生，是否允许继续拖放 QueryContinueDrag
   gcMain.QueryContinueDrag += delegate(object sender, QueryContinueDragEventArgs e)
   {
    switch (e.Action)
    {
     case DragAction.Continue:
      // 移动遮罩
      Point offSetPoint = new Point(Cursor.Position.X + 1, Cursor.Position.Y - dragMaster.DragSize.Height / 2);
      dragMaster.DoDrag(offSetPoint, DragDropEffects.Move, false);
      break;
     default:
      // 清空
      _DragRowRect = Rectangle.Empty;
      // 停止拖动
      dragMaster.EndDrag();
      break;
    }
   };
   #endregion
   #region 点击行头移动行
   gvMain.CustomDrawRowIndicator += delegate(object sender, RowIndicatorCustomDrawEventArgs e)
   {
    if (_DragRowRect == Rectangle.Empty && _DownHitInfo != null && _DownHitInfo.RowHandle == e.RowHandle)
    {
     _DragRowRect = e.Bounds;
    }
   };
   #endregion
  }
  /// <summary>
  /// GridView 拖拽
  /// </summary>
  /// <param name="gvMain"></param>
  public static void DragGridRow<T>(this GridView gvMain)
  {
   // 拖拽遮罩控件
   DragMaster dragMaster = new DragMaster();
   // 当前拖拽行绘画区域
   Rectangle _DragRowRect = Rectangle.Empty;
   GridControl gcMain = gvMain.GridControl;
   GridHitInfo _DownHitInfo = null;
   //表格属性 允许拖拽
   gcMain.AllowDrop = true;
   gvMain.OptionsDetail.EnableMasterViewMode = false;
   #region 将对象拖至边界时发生 DragOver
   gcMain.DragOver += delegate(object sender, System.Windows.Forms.DragEventArgs e)
   {
    if (e.Data.GetDataPresent(typeof(T)))
     e.Effect = DragDropEffects.Move;
    else
     e.Effect = DragDropEffects.None;
   };
   #endregion
   #region 拖拽完成时处理数据 DragDrop
   gcMain.DragDrop += delegate(object sender, System.Windows.Forms.DragEventArgs e)
   {
    // 拖过来的新数据
    T newRow = (T)e.Data.GetData(typeof(T));
    // 原来在此坐标的数据
    // e的坐标是相对于屏幕的
    var clientPoint = gcMain.PointToClient(new Point(e.X, e.Y));
    GridHitInfo hitInfo = gvMain.CalcHitInfo(new Point(clientPoint.X, clientPoint.Y));
    var oldRow = (T)gvMain.GetRow(hitInfo.RowHandle);
    // 如果相等则不处理
    if (oldRow == null || newRow == null) return;
    // 且目标位置不是最后一行的话要将所有序号重排
    // 原来的行号
    var oldIndex = _DownHitInfo.RowHandle;
    // 新的行号
    var newIndex = hitInfo.RowHandle;
      BindingSource bs = (BindingSource)(gcMain.DataSource);
    if (bs == null)
     return;
      bs.RemoveAt(oldIndex);
    bs.Insert(oldIndex, oldRow);
    bs.RemoveAt(newIndex);
    bs.Insert(newIndex, newRow);
    bs.ResetBindings(false);
   };
   #endregion
   #region 鼠标按下 MouseDown
   gcMain.MouseDown += delegate(object sender, MouseEventArgs e)
   {
    _DownHitInfo = null;
    GridHitInfo hitInfo = gvMain.CalcHitInfo(new Point(e.X, e.Y));
    if (Control.ModifierKeys != Keys.None) return;
    if (e.Button == MouseButtons.Left && hitInfo.RowHandle >= 0)
    {
     // 禁用的Grid不支持拖拽
     if (!gvMain.OptionsBehavior.Editable
      || gvMain.OptionsBehavior.ReadOnly)
      return;
     // 只有点击最前面才能拖拽
     if (hitInfo.InRowCell)
      return;
     // 缓存
     _DownHitInfo = hitInfo;
    }
   };
   #endregion
   #region 鼠标移动 MouseMove
   gcMain.MouseMove += delegate(object sender, MouseEventArgs e)
   {
    if (e.Button == MouseButtons.Left)
    {
     if (_DownHitInfo != null)
     {
      Size dragSize = SystemInformation.DragSize;
      // 偏离区域
      Rectangle dragRect = new Rectangle(new Point(_DownHitInfo.HitPoint.X - dragSize.Width / 2, _DownHitInfo.HitPoint.Y - dragSize.Height / 2), dragSize);
        if (!dragRect.Contains(new Point(e.X, e.Y)))
      {
       // 屏幕坐标
       var p =