Von Listview1 auf Listview2 zugreifen

[DeddyH]

So, hier eine minimalistische Demo (vorsichtshalber in Delphi 7 ohne Generics oder dergleichen). Zunächst die Datenklasse:

Delphi-Quellcode:

unit TestData;

interface

uses Classes;

type
  TTest = class
  private
    FKW: Byte;
    FNames: TStrings;
  public
    constructor Create(AKW: Byte);
    destructor Destroy; override;
    property KW: Byte read FKW;
    property Names: TStrings read FNames;
  end;

implementation

{ TTest }

constructor TTest.Create(AKW: Byte);
begin
  inherited Create;
  FKW := AKW;
  FNames := TStringlist.Create;
end;

destructor TTest.Destroy;
begin
  FNames.Free;
  inherited;
end;

end.

Und die Oberfläche dazu:

Delphi-Quellcode:

unit uMain;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, Contnrs, ComCtrls, TestData;

type
  TForm1 = class(TForm)
    ListView1: TListView;
    ListView2: TListView;
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure ListView1SelectItem(Sender: TObject; Item: TListItem;
      Selected: Boolean);
  private
    { Private-Deklarationen }
    FKW: TObjectList;
    procedure GenerateTestData;
    procedure DisplayKWList;
    procedure DisplayNames(ATest: TTest);
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

(* Anzeige der KWs aus der FKW-Liste in ListView1 *)
procedure TForm1.DisplayKWList;
var
  i: integer;
  Item: TListItem;
  Test: TTest;
begin
  ListView1.Items.BeginUpdate;
  try
    ListView1.Items.Clear;
    for i := 0 to FKW.Count - 1 do
      begin
        Item := ListView1.Items.Add;
        Test := FKW[i] as TTest;
        Item.Caption := IntToStr(Test.KW);
        (* Anhängen der Instanz an den Listeneintrag *)
        Item.Data := Test;
      end;
  finally
    ListView1.Items.EndUpdate;
  end;
end;

(* Anzeige der Namen zur übergebenen KW in ListView2 *)
procedure TForm1.DisplayNames(ATest: TTest);
var
  i: integer;
  Item: TListItem;
begin
  ListView2.Items.BeginUpdate;
  try
    ListView2.Items.Clear;
    for i := 0 to ATest.Names.Count - 1 do
      begin
        Item := ListView2.Items.Add;
        Item.Caption := ATest.Names[i];
      end;
  finally
    ListView2.Items.EndUpdate;
  end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  FKW := TObjectList.Create;
  GenerateTestData;
  DisplayKWList;
end;

procedure TForm1.FormDestroy(Sender: TObject);
begin
  FKW.Free;
end;

procedure TForm1.GenerateTestData;
var
  Data: TTest;
begin
  Data := TTest.Create(1);
  Data.Names.Add('Heinz');
  Data.Names.Add('Hans');
  Data.Names.Add('August');
  FKW.Add(Data);
  Data := TTest.Create(2);
  Data.Names.Add('Fritz');
  Data.Names.Add('Sabine');
  Data.Names.Add('Eleonore');
  FKW.Add(Data);
  Data := TTest.Create(3);
  Data.Names.Add('Victor');
  Data.Names.Add('Kunigunde');
  Data.Names.Add('Klaus-Bärbel');
  FKW.Add(Data);
end;

(* Bei Auswahl einer KW deren Daten anzeigen *)
procedure TForm1.ListView1SelectItem(Sender: TObject; Item: TListItem;
  Selected: Boolean);
var
  Test: TTest;
begin
  if Selected then
    begin
      Test := TTest(Item.Data);
      if Assigned(Test) then
        DisplayNames(Test);
    end;
end;

end.