The standard code for image scaling has a prompt for "undeclared identifier", please help

[jiyiwan 0]

I'm writing an Android app in delphi 10.4.2 and when I write the scaling code in the OnGesture event of the image1 control, the IDE says "uncleared identifier" for the ScaleFactor. I've looked at it repeatedly, but I don't know where the problem is coming from, so I'm looking for help.
Here is my code:
unit Unit1;

interface

uses
  System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants,
  FMX.Types, FMX.Controls, FMX.Forms, FMX.Graphics, FMX.Dialogs,
  FMX.Controls.Presentation, FMX.StdCtrls, FMX.Objects, FMX.Layouts,
  FMX.ExtCtrls,
  FMX.Gestures,
  FMX.Edit,
  System.IOUtils;
type
  TForm1 = class(TForm)
    Label1: TLabel;
    Button1: TButton;
    ImageViewer1: TImageViewer;
    Image1: TImage;
    GestureManager1: TGestureManager;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure ImageViewer1Gesture(Sender: TObject;
      const EventInfo: TGestureEventInfo; var Handled: Boolean);
    procedure Image1Gesture(Sender: TObject; const EventInfo: TGestureEventInfo;
      var Handled: Boolean);
  private
    { Private declarations }
     FLastDistance: Integer; 
     const MIN_DIM = 100; 
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  G_lujing:string='';
  G_myDir:string='MyBrain';
implementation

{$R *.fmx}
{$R *.LgXhdpiTb.fmx ANDROID}
{$R *.SmXhdpiPh.fmx ANDROID}
{$R *.iPhone55in.fmx IOS}

procedure TForm1.FormCreate(Sender: TObject);
var path: string; fileName:string;
begin
  path:=TPath.GetSharedDownloadsPath;
  path := TPath.GetDirectoryName(path);
  G_lujing:=TPath.Combine(path, G_myDir);
  try
    if not TDirectory.Exists(G_lujing) then  TDirectory.CreateDirectory(G_lujing);
    fileName := TPath.Combine(G_lujing, 'test.txt');
    if not FileExists(fileName) then TFile.WriteAllText(fileName, 'Hello world!');
  except on
    E: Exception do ShowMessage('An error occurred while creating the directory:' + E.Message);
  end;
end;

procedure TForm1.Image1Gesture(Sender: TObject;
  const EventInfo: TGestureEventInfo; var Handled: Boolean);
begin
  if EventInfo.GestureID = igiZoom then
  begin
    // Zoom the image using ScaleFactor
    Image1.Scale.X := Image1.Scale.X * EventInfo.ScaleFactor;
    Image1.Scale.Y := Image1.Scale.Y * EventInfo.ScaleFactor;
    // Adjust the image position based on the gesture focus point
    Image1.Position.Point := EventInfo.FocusPoint;
  end;
end;

end.

 

[PeterBelow 238]

8 hours ago, jiyiwan said:

TGestureEventInfo

The TGestureEventInfo record does not have a ScaleFactor field, that is the cause of the error you get.