public DragHelper_gridview(GridView gvMain)
{
_gvMain = gvMain;
_dragMaster = new DragMaster();
//表格属性 允许拖拽
gvMain.GridControl.AllowDrop = true;
gvMain.OptionsDetail.EnableMasterViewMode = false;
gvMain.GridControl.DragOver += GcMain_DragOver;
gvMain.GridControl.DragDrop += GcMain_DragDrop;
gvMain.GridControl.MouseDown += GcMain_MouseDown;
gvMain.GridControl.MouseMove += GcMain_MouseMove;
gvMain.GridControl.QueryContinueDrag += GcMain_QueryContinueDrag;
gvMain.CustomDrawRowIndicator += GvMain_CustomDrawRowIndicator;
}
/// <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 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 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
}
