Delphi TListBox项上下移动

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最新推荐文章于 2024-02-18 16:34:16 发布

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分类专栏： Delphi 文章标签： delphi

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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.