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unit item;

interface

uses
  SysUtils;

type

  Itemclass = class
    id : integer;
    name : String;
    description : String;

    constructor Create(pId : Integer; pName, pDescription : String);
    function getText: String;
  end;

implementation

constructor Itemclass.Create(pId : Integer; pName, pDescription : String);
begin
  id := pid;
  name := pname;
  description := pDescription;
end;

function Itemclass.getText;
begin
  result := inttostr(id)+' '+name+' '+description;
end;

end.

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unit main;

interface

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

type

  TMyListSortCompare = function (Item1, Item2: Pointer): Integer of object;

  TForm1 = class(TForm)
    sortBtn: TButton;
    ListBox1: TListBox;

    procedure FormCreate(Sender: TObject);
    procedure sortBtnClick(Sender: TObject);
  private
    { Private-Deklarationen }

    itemlist : Tlist;
    FCompareListItems:TMyListSortCompare;
    function CompareListItems(Item1, Item2: Pointer): Integer;
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation



{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
var
  i1,i2,i3,i4,i5: Itemclass;
begin
  FCompareListItems:=CompareListItems;
  itemlist := tlist.Create;

  i1 := Itemclass.Create(1,'item 1','desc');
  i2 := Itemclass.Create(4,'item 4','desc');
  i3 := Itemclass.Create(5,'item 5','desc');
  i4 := Itemclass.Create(1,'item 1','desc');
  i5 := Itemclass.Create(2,'item 2','desc');

  itemlist.Add(i1);
  itemlist.Add(i2);
  itemlist.Add(i3);
  itemlist.Add(i4);
  itemlist.Add(i5);
end;

procedure TForm1.sortBtnClick(Sender: TObject);
var
  i : integer;
begin
  for I := 0 to itemList.Count - 1 do
    ListBox1.AddItem(Itemclass(itemlist[i]).getText,itemlist[i]);
  ListBox1.AddItem('-------------',nil);

  itemlist.Sort(TListSortCompare(@FCompareListItems));

  for I := 0 to itemList.Count - 1 do
    ListBox1.AddItem(Itemclass(itemlist[i]).getText,itemlist[i]);
end;

function TForm1.CompareListItems(Item1, Item2: Pointer): Integer;
begin
  if Itemclass(item1).id < Itemclass(item2).id then
    result := -1
  else   if Itemclass(item1).id > Itemclass(item2).id then
    result := 1
  else
    result := 0;
end;

end.

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function CompareNames(Item1, Item2: Pointer): Integer;
begin
  //Result := CompareText(ItemClass(Item1).getText, ItemClass(Item2).getText);

  if ItemClass(Item1).id = ItemClass(Item2).id then // IDs gleich?
    Result := CompareText(ItemClass(Item1).getText, ItemClass(Item2).getText) // Dann kommt's auf den Text an
  else
  if ItemClass(Item1).id > ItemClass(Item2).id then
    result := 1
  else
    result := -1;
end;
...
itemlist.Sort(@CompareNames);