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unit Main;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls,dateUtils;

type

  CompareProc = Procedure (List: TStringList; Index1, Index2: Integer );
  TlistBox=Class(stdCtrls.TListBox)
      Procedure Sort(p:CompareProc);
  End;



  TForm5 = class(TForm)
    ListBox1: TListBox;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
    procedure ListBox1Click(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form5: TForm5;

implementation

{$R *.dfm}
function CompareZahl(const A, B: Double):Integer;
begin
  if A =B then Result := 0
  else if A < B then
    Result := -1
  else
    Result := 1;
end;

function Compare4Int(List: TStringList; Index1, Index2: Integer ):Integer;
var
  i1,i2:Integer;
begin
     if TryStrToInt(List[index1],i1) and TryStrToInt(List[index2],i2) then
       Result := CompareZahl(i1, i2)
     else Result := 0;
end;

function Compare4FirstIsInt(List: TStringList; Index1, Index2: Integer ):Integer;
var
  cnt1,cnt2:Integer;
  Procedure GetCount(Var cnt:Integer;Index:Integer);
    begin
       cnt := 0;
       while (Length(List[index]) > (cnt ))  and (List[Index][cnt + 1] in ['0'..'9']) do  inc(cnt);
    end;
begin
     GetCount(cnt1,Index1);
     GetCount(cnt2,Index2);
     if (cnt1>0) and (cnt2>0) then
       Result := CompareZahl(StrToInt(Copy(List[Index1],1,cnt1 )) , StrToInt(Copy(List[Index2],1,cnt2 )))
     else Result := 0;
end;

procedure TForm5.Button1Click(Sender: TObject);

begin
   ListBox1.Items.AddObject('4 was auch immer mit Objekt',TObject(4));
 //  ListBox1.Sort(@Compare4Int)
  ListBox1.Sort(@Compare4FirstIsInt);
end;

{ TlistBox }



procedure TlistBox.Sort(p:CompareProc);
var
  sl:TStringList;
begin
  sl := TStringList.Create;
  try
       sl.Assign(Items);
       sl.CustomSort(@p);
       Items.Assign(sl);
  finally
    sl.Free;
  end;

end;

procedure TForm5.ListBox1Click(Sender: TObject);
begin
   Showmessage(IntToStr(Integer(ListBox1.Items.Objects[ListBox1.ItemIndex])));
end;

end.