当ChildRow没有数据时,从XtraGrid GridView的MasterRow中删除Drilldown Plus图标(+)

Question

这与DevExpess XtraGrid的GridView有关.

我需要drilldown plus icon (+)从GridView中的任何MasterRow中删除它没有任何数据的ChildRow.

目前,我的GridView中的所有行(MasterRows)都显示了drilldown plus icon (+).当drilldown plus icon (+)被点击,ChildRow显示有相应的数据.但是,如果ChildRow没有数据,则不显示(扩展)ChildRow.我需要使drilldown plus icon (+)隐形,以便用户在ChildRow中没有数据时看不到它.

我有一个函数来检查ChildRow是否有数据可用,然后允许ChildRow显示(展开)或不显示.

我已经使用GridView.OptionsView.ShowDetailButtons但隐藏了drilldown plus icons (+)所有行.这对我不起作用,因为如果没有ChildRow的数据,我只需要隐藏它.

这是我到目前为止的代码:

private void gridView1_MasterRowGetRelationCount(object sender, MasterRowGetRelationCountEventArgs e)
{
    e.RelationCount = 1;
}

private void gridView1_MasterRowEmpty(object sender, MasterRowEmptyEventArgs e)
{
    e.IsEmpty = IsRelationEmpty(e.RowHandle, e.RelationIndex);
}

bool IsRelationEmpty(int rowHandleX, int relationIndex)
{
    Tuple<string, double, double> row = (Tuple<string, double, double>)gridView1.GetRow(rowHandleX);
    return rowHandleX == DevExpress.XtraGrid.GridControl.InvalidRowHandle || _tfs._dataDictionary[row.Item1.ToString()].Item2.Count == 0;
}

private void gridView1_MasterRowGetChildList(object sender, MasterRowGetChildListEventArgs e)
{
    if (IsRelationEmpty(e.RowHandle, e.RelationIndex))
    {
        return;
    }

    Tuple<string, double, double> row = (Tuple<string, double, double>)gridView1.GetRow(e.RowHandle);
    e.ChildList = _tfs._dataDictionary[row.Item1.ToString()].Item2.ToList(); // _tfs.DictionaryToList();
}

private void gridView1_MasterRowGetRelationName(object sender, MasterRowGetRelationNameEventArgs e)
{
    e.RelationName = "Work Items with no Size Estimate:";
}

任何方向或建议将不胜感激.

提前致谢,

Marwan (^_^)

Answer 1

我建议你按照这个DevExpress线程 - 如何隐藏没有明细记录的主行的禁用展开/折叠按钮

XtraGrid不提供隐藏主细节展开按钮以显示空细节的选项.您可以通过CustomDrawCell事件解决此限制 .

这是必要的代码:

private void gridView1_CustomDrawCell(object sender, DevExpress.XtraGrid.Views.Base.RowCellCustomDrawEventArgs e) {

    GridView view = sender as GridView;
    if(e.Column.VisibleIndex == 0 && view.IsMasterRowEmpty(e.RowHandle))
        (e.Cell as GridCellInfo).CellButtonRect = Rectangle.Empty;
    }
}

希望这有帮助..