unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;
 
type
  TForm1 = class(TForm)
    ListBox1: TListBox;
    Button1: TButton;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.dfm}
 
procedure LbMoveItemUp(AListBox: TListBox);
var
  CurrIndex: Integer;
begin
  with AListBox do
    if ItemIndex > 0 then
    begin
      CurrIndex := ItemIndex;
      Items.Move(ItemIndex, (CurrIndex - 1));
      ItemIndex := CurrIndex - 1;
    end;
end;
 
 
// Move an item down
 
procedure LbMoveItemDown(AListBox: TListBox);
var
  CurrIndex, LastIndex: Integer;
begin
  with AListBox do
  begin
    CurrIndex := ItemIndex;
    LastIndex := Items.Count;
    if ItemIndex <> -1 then
    begin
      if CurrIndex + 1 < LastIndex then
      begin
        Items.Move(ItemIndex, (CurrIndex + 1));
        ItemIndex := CurrIndex + 1;
      end;
    end;
  end;
end;
 
 
 
procedure TForm1.Button1Click(Sender: TObject);
begin
    LbMoveItemUp(ListBox1);
end;
 
procedure TForm1.Button2Click(Sender: TObject);
begin
   LbMoveItemDown(ListBox1);
end;
 
end.