unit1.pas

来自「《深入Delphi的多媒体编程》实例源代码」· PAS 代码 · 共 65 行

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    Timer1: TTimer;
    Label1: TLabel;
    procedure Timer1Timer(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
    CanMoveFlag:Boolean;
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

//使用Label构件移动
procedure TForm1.Timer1Timer(Sender: TObject);
begin
 if CanMoveFlag then
  begin
   If Label1.Left<0 then
     Label1.Left:=Form1.Width//超过左边屏幕,重新赋值
   else
     Label1.Left:=Label1.Left-5;//递减横坐标
  end;
end;

//移动的开始或停止
procedure TForm1.Button1Click(Sender: TObject);
begin
 if CanMoveFlag then
  begin
   CanMoveFlag:=False;
   Button1.Caption:='开始';
  end
 else
  begin
   CanMoveFlag:=True;
   Button1.Caption:='停止';
  end;
end;

//初始化变量
procedure TForm1.FormCreate(Sender: TObject);
begin
 CanMoveFlag:=False;
end;

end.