Hello Markus Giera,
RadGridView for Winforms does not support custom hierarchy (yet), but you can achieve similar behavior with the presented API of
RadGridView.
You need to check that a specified row has child rows. Also, as you mentioned you need to subscribe for the
ViewCellFormatting event where you can hide the plus-minus element. Finally you have to prevent from expanding rows that don't have child rows in the
ChildViewExpanding event. You can use the following code snippet:
private void radGridView_ViewCellFormatting(object sender, CellFormattingEventArgs e)
{
GridGroupExpanderCellElement cellElement = e.CellElement as GridGroupExpanderCellElement;
GridViewDataRowInfo dataRow = e.CellElement.RowInfo as GridViewDataRowInfo;
if (cellElement != null && dataRow != null)
{
bool hasChildRows = false;
if (dataRow.Tag == null)
{
hasChildRows = this.HasChildRows(dataRow);
dataRow.Tag = hasChildRows;
}
else
{
hasChildRows = (bool)dataRow.Tag;
}
if (hasChildRows)
{
cellElement.ResetValue(GridGroupExpanderCellElement.SignStyleProperty, ValueResetFlags.Local);
}
else
{
cellElement.SignStyle = GridGroupExpanderCellElement.SignStyles.Image;
}
}
}
private void radGridView_ChildViewExpanding(object sender, ChildViewExpandingEventArgs e)
{
GridViewDataRowInfo dataRow = e.ParentRow;
bool hasChildRows = false;
if (dataRow.Tag == null)
{
hasChildRows = this.HasChildRows(dataRow);
}
else
{
hasChildRows = (bool)dataRow.Tag;
}
e.Cancel = !hasChildRows;
dataRow.Tag = hasChildRows;
}
If you need further assistance do not hesitate to write us back.
All the best,
Svett
the Telerik team
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