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delphitlistview

Count the number of items in a TListview Group

When I attempt to count the number of items in a group I get the total number of items in the collection. How do you get the number of items in each group?

Solution

  • This is probably the simplest way.

    procedure TForm1.Click(Sender: TObject);
begin
  ShowMessage(IntToStr(GetNumItemsInGroup(1)));
end;

function TForm1.GetNumItemsInGroup(const GroupID: integer): integer;
var
  i: Integer;
begin
  result := 0;
  assert((GroupID >= 0) and (GroupID <= ListView1.Groups.Count - 1));
  for i := 0 to ListView1.Items.Count - 1 do
    if ListView1.Items.Item[i].GroupID = GroupID then
      inc(result);
end;