这是TProgressBarStyleHook中没有实现的特性。不幸的是，当处于选框模式时，Windows不会向进度条控件发送任何消息来指示进度条的位置是否发生了变化，因此您必须自己实现一种机制来模仿PBS_MARQUEE样式，这可以很容易地通过创建一个新的样式挂钩并在样式挂钩内使用TTimer来完成。
检查Style钩子的基本实现

uses
  Vcl.Styles,
  Vcl.Themes,
  Winapi.CommCtrl;

{$R *.dfm}

type
 TProgressBarStyleHookMarquee=class(TProgressBarStyleHook)
   private
    Timer : TTimer;
    FStep : Integer;
    procedure TimerAction(Sender: TObject);
   protected
    procedure PaintBar(Canvas: TCanvas); override;
   public
    constructor Create(AControl: TWinControl); override;
    destructor Destroy; override;
 end;

constructor TProgressBarStyleHookMarquee.Create(AControl: TWinControl);
begin
  inherited;
  FStep:=0;
  Timer := TTimer.Create(nil);
  Timer.Interval := 100;//TProgressBar(Control).MarqueeInterval;
  Timer.OnTimer := TimerAction;
  Timer.Enabled := TProgressBar(Control).Style=pbstMarquee;
end;

destructor TProgressBarStyleHookMarquee.Destroy;
begin
  Timer.Free;
  inherited;
end;

procedure TProgressBarStyleHookMarquee.PaintBar(Canvas: TCanvas);
var
  FillR, R: TRect;
  W, Pos: Integer;
  Details: TThemedElementDetails;
begin
  if (TProgressBar(Control).Style=pbstMarquee) and StyleServices.Available  then
  begin        
    R := BarRect;
    InflateRect(R, -1, -1);
    if Orientation = pbHorizontal then
      W := R.Width
    else
      W := R.Height;

    Pos := Round(W * 0.1);
    FillR := R;
    if Orientation = pbHorizontal then
    begin
      FillR.Right := FillR.Left + Pos;
      Details := StyleServices.GetElementDetails(tpChunk);
    end
    else
    begin
      FillR.Top := FillR.Bottom - Pos;
      Details := StyleServices.GetElementDetails(tpChunkVert);
    end;

    FillR.SetLocation(FStep*FillR.Width, FillR.Top);
    StyleServices.DrawElement(Canvas.Handle, Details, FillR);
    Inc(FStep,1);
    if FStep mod 10=0 then
     FStep:=0;
  end
  else
  inherited;
end;

procedure TProgressBarStyleHookMarquee.TimerAction(Sender: TObject);
var
  Canvas: TCanvas;
begin
  if StyleServices.Available and (TProgressBar(Control).Style=pbstMarquee) and Control.Visible  then
  begin
    Canvas := TCanvas.Create;
    try
      Canvas.Handle := GetWindowDC(Control.Handle);
      PaintFrame(Canvas);
      PaintBar(Canvas);
    finally
      ReleaseDC(Handle, Canvas.Handle);
      Canvas.Handle := 0;
      Canvas.Free;
    end;
  end
  else
  Timer.Enabled := False;
end;

initialization

TStyleManager.Engine.RegisterStyleHook(TProgressBar, TProgressBarStyleHookMarquee);

end.

您可以查看此风格钩子here的演示