unit main;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.ExtCtrls, Vcl.StdCtrls, Vcl.ComCtrls,  System.Threading;

type
  TfrmMain = class(TForm)
    btnStart: TButton;
    progressBar: TProgressBar;
    lblStatus: TLabel;
    procedure FormCreate(Sender: TObject);
    procedure btnStartClick(Sender: TObject);

  private
    { Private declarations }
    FMyTask : ITask ;
    procedure startTask ;
    procedure stopTask ;
  public
    { Public declarations }
  end;

var
   frmMain   : TfrmMain ;
   direction : Boolean  ;
   runIt     : Boolean  ;

implementation

{$R *.dfm}




procedure TfrmMain.FormCreate(Sender: TObject);
begin
   direction := False ;
   runIt     := False ;
end;



procedure TfrmMain.btnStartClick(Sender: TObject);
begin
   runIt := NOT runIt ;
   if runIt then
      begin
         btnStart.Caption := 'Stop Monitoring' ;
         startTask ;
      end
   else
      begin
         btnStart.Caption := 'Start Monitoring' ;
         stopTask ;
      end;
end;


procedure TfrmMain.startTask;
begin
   lblStatus.Caption := 'Measuring' ;
  // Create and start the background task
  FMyTask := TTask.Run(
    procedure
    begin
     // Check if the Stop button was clicked
     if TTask.CurrentTask.Status = TTaskStatus.Canceled then
       Exit; // Gracefully exit the thread loop


     // Simulate work (e.g., 500ms step)
     while runIt do
     begin

     Sleep(1000);

     // 2. Safely update the UI progress
     TThread.Queue(nil,
       procedure
       begin
         direction := Not direction ;
         if direction then
            mouse.CursorPos := Point( mouse.CursorPos.X + 2, mouse.CursorPos.Y + 2 )
         else
            mouse.CursorPos := Point( mouse.CursorPos.X - 2, mouse.CursorPos.Y - 2 )
        end);
      end;
    end);
end;

procedure TfrmMain.stopTask;
begin
   if (FMyTask <> nil ) then
   begin
      lblStatus.Caption := '' ;
      FMyTask.Cancel ;
   end;
end;

end.