Оформил: DeeCo
Автор: http://www.swissdelphicenter.ch

{ 
  Use this ProgressBar when you do not know the amount of progress toward 
  completion but wish to indicate that progress is being made. 

  This ProgressBar works only on Windows XP and the ComCtl32.dll version 
  6.00 or later is needed. To use the new ComCtrl you have to provide the manifest. 
  In Delphi 7 just drop TXPManifest on the form. For prior versions of Delphi 
  you have to include the XP manifest resource. 
}


 unit MarqueeProgressBar;

 interface

 uses
   SysUtils, Windows, Classes, Controls, ComCtrls, Messages;

 type
   TMarqueeProgressBar = class(TProgressBar)
   private
     FActive: Boolean;
     FAnimationSpeed: Integer;
     procedure SetActive(const Value: Boolean);
     procedure SetAnimationSpeed(const Value: Integer);
     procedure UpdateProgressBar;
   protected
     procedure CreateParams(var Params: TCreateParams); override;
   public
     constructor Create(AOwner: TComponent); override;
   published
     property Active: Boolean read FActive write SetActive;
     property AnimationSpeed: Integer read FAnimationSpeed write SetAnimationSpeed;
   end;

 const
   PBS_MARQUEE  = $08;
   PBM_SETMARQUEE = WM_USER + 10;

 procedure Register;

 implementation

 procedure Register;
 begin
   RegisterComponents('SwissDelphiCenter', [TMarqueeProgressBar]);
 end;

 constructor TMarqueeProgressBar.Create(AOwner: TComponent);
 begin
   inherited;
   FAnimationSpeed := 60;
 end;

 procedure TMarqueeProgressBar.CreateParams(var Params: TCreateParams);
 begin
   inherited;
   Params.Style := Params.Style or PBS_MARQUEE;
 end;

 procedure TMarqueeProgressBar.SetActive(const Value: Boolean);
 begin
   FActive := Value;
   UpdateProgressBar;
 end;

 procedure TMarqueeProgressBar.SetAnimationSpeed(const Value: Integer);
 begin
   FAnimationSpeed := Value;
   UpdateProgressBar;
 end;

 procedure TMarqueeProgressBar.UpdateProgressBar;
 begin
   if FActive then
     SendMessage(Self.Handle, PBM_SETMARQUEE, 1, FAnimationSpeed)
   else
     SendMessage(Self.Handle, PBM_SETMARQUEE, 0, 0);
 end;

 end.