unit1.pas

学习Delphi最好的教材。通过一个个简单而实用的实例

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Timer1: TTimer;
    Label1: TLabel;
    Shape1: TShape;
    procedure Timer1Timer(Sender: TObject);
    procedure FormKeyDown(Sender: TObject; var Key: Word;
      Shift: TShiftState);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  if Label1.Caption='向上' then
    Shape1.Top:=Shape1.Top-5;
  if Label1.Caption='向左' then
    Shape1.Left:=Shape1.Left-5;
  if Label1.Caption='向下' then
    Shape1.Top:=Shape1.Top+5;
  if Label1.Caption='向右' then
    Shape1.Left:=Shape1.Left+5;
end;

procedure TForm1.FormKeyDown(Sender: TObject; var Key: Word;
  Shift: TShiftState);
begin
  if Key=32 then Label1.Caption:='停止';
  if Key=37 then Label1.Caption:='向左';
  if Key=38 then Label1.Caption:='向上';
  if Key=39 then Label1.Caption:='向右';
  if Key=40 then Label1.Caption:='向下';
end;

end.