unit1.pas

本光盘是《Delphi 7应用教程》一书的配套光盘

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    ListBox1: TListBox;
    Label1: TLabel;
    Label2: TLabel;
    procedure Edit1KeyPress(Sender: TObject; var Key: Char);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
var
  mm:Integer;
begin
  if key=#13 then               //Enter键的ASCII值为13
    begin
      mm:=0;
      while (mm<ListBox1.Count)  do  //ListBox1.Count为列表项的总数
        begin
          if Edit1.Text=ListBox1.Items[mm] then
            begin
              Edit1.SelectAll;      //编辑框以高亮度显示
              ListBox1.ItemIndex :=mm;  //选中该列表项
              break;         //终止整个循环
            end;
            mm:=mm+1;
         end;
      if mm=ListBox1.Count then   //说明编辑框文本不在列表框中
        begin
           ListBox1.Items.Add(Edit1.Text); //添加到列表框
           Edit1.Text:='';
        end;
    end;
end;

end.