Example: OnIsGroupNode

• Jul 30, 2021

The following sample uses the OnIsGroupNode event. The event handler checks whether the current node is a root level node and, if so, the handler makes it a group node.

Note that it is necessary to set the PaintStyle to tlpsCategorized.

Delphi

procedure <Form>.<TreeList>IsGroupNode(Sender: TcxCustomTreeList;
  ANode: TcxTreeListNode; var IsGroup: Boolean);
begin
  IsGroup := ANode.Level = 0;
end;

C++

void __fastcall <Form>::<TreeList>IsGroupNode(TcxCustomTreeList *Sender, TcxTreeListNode *ANode, bool &IsGroup) {
  IsGroup = (ANode->Level == 0);
}