C#教程之DevExpress实现自定义TreeListNode的Tooltip的方

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C#教程之DevExpress实现自定义TreeListNode的Tooltip的方

本文实例展示了DevExpress实现自定义TreeListNode的Tooltip的方法，具体方法如下所示：

主要功能代码如下：

/// <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);

   }

 }

  }

}

代码运行效果如下：

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