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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);
}
}
}
}
</div>
代码运行效果如下：
