DevExpress实现自定义TreeListNode的Tooltip的方法

/// <summary>
/// 为节点提供Tooltip
/// 说明：
/// 1.设置tree.ToolTipController属性
/// 2.ToolTipController的GetActiveObjectInfo事件中使用
/// 3.举例
/// tlLHData.CustomNodeTooltip(e, node =>
///{
///  string _cabId = node.GetKeyID();
///  CCabInfo _cabinfo = LHDBHelper.GetCabInfo(_cabId);
///  if (_cabinfo != null)
///  {
///    return string.Format("核对时间:{0}\r\n在线情况:{1}\r\n最后一次活跃时间:{2}\r\n",
///               _cabinfo.ChkDataTime,
///               _cabinfo.CtuOnlineStatus == 1 ? "在线" : "未上线",
///               _cabinfo.LastAliveTime);
///  }
///  return string.Empty;
///});
/// </summary>
/// <param name="tree">TreeList</param>
/// <param name="e">ToolTipControllerGetActiveObjectInfoEventArgs</param>
/// <param name="builderNodeTooltipHandler">委托</param>
public static void CustomNodeTooltip(this TreeList tree, ToolTipControllerGetActiveObjectInfoEventArgs e, Func<TreeListNode, string> builderNodeTooltipHandler)
{
  if (e.SelectedControl is DevExpress.XtraTreeList.TreeList)
  {
 TreeList _tree = (TreeList)e.SelectedControl;
 TreeListHitInfo _hit = _tree.CalcHitInfo(e.ControlMousePosition);
 if (_hit.HitInfoType == HitInfoType.Cell)
 {
   TreeListViewInfo _viewInfo = _tree.ViewInfo;
   RowInfo _rowInfo = _viewInfo.GetRowInfoByPoint(e.ControlMousePosition);
   CellInfo _cellInfo = _rowInfo.Cells[_hit.Column.VisibleIndex] as CellInfo;
   EditHitInfo _editHitInfo = _cellInfo.EditorViewInfo.CalcHitInfo(e.ControlMousePosition);
   if (_editHitInfo.HitTest == EditHitTest.MaskBox)
   {
 string _toolTip = builderNodeTooltipHandler(_hit.Node);
 if (!string.IsNullOrEmpty(_toolTip))
   e.Info = new ToolTipControlInfo(_cellInfo, _toolTip);
   }
 }
  }
}