Example

• Aug 02, 2022

In this example we use the OnSetDisplayItemText event to change the text of tree nodes based on the tree node level. Tree nodes may display any text, but you will can only edit Text that is required from the field – ListField.

procedure TForm1.dxDBTreeViewSetDisplayItemText(Sender: TObject;
  var DisplayText: string);
Var
 tr : TTreeNode; 
begin
  // Get TreeNode
  tr := dxDBTreeView.DBTreeNodes.GetTreeNode(TreeQueryID.Value);
  if tr <> Nil then begin
    if tr.Level mod 2 = 1 then
      DisplayText := Field1.Text
    else DisplayText := Field2.Text;
  end;  
end;