how leverage Revit’s Idling event to queue up work to be done inside these code




namespace MyRevitPlugin
{
    public class Class1 : IExternalApplication
    {

        public Result OnStartup(UIControlledApplication application)
        {
            RibbonPanel ribbonPanel = application.CreateRibbonPanel("MyRibbonPanel");

            // Create a button to trigger some command and add it to the Ribbon Panel
            string thisAssemblyPath = Assembly.GetExecutingAssembly().Location;
            PushButtonData buttonData = new PushButtonData("cmdMyTest", "My HV Test", thisAssemblyPath, "MyRevitPlugin.HttpServerCommand3");

            PushButton pushButton = ribbonPanel.AddItem(buttonData) as PushButton;

            // optionally, you can add other properties to the button, like for example a Tool-Tip
            pushButton.ToolTip = "Hello, this is my first Revit Plug-in";

            // Bitmap Icon
            Uri urlImage = new Uri(@"C:\Users\HarshVardhan\OneDrive - Intelliswift Software Inc\Desktop\HVRevit\ml2.png");
            BitmapImage bitmapImage = new BitmapImage(urlImage);
            pushButton.LargeImage = bitmapImage;

            return Result.Succeeded;




        }

        public Result OnShutdown(UIControlledApplication application)
        {
            return Result.Succeeded;
        }
    }

   [Transaction(TransactionMode.Manual)]
   [Regeneration(RegenerationOption.Manual)]
   public class HttpServerCommand3 : IExternalCommand
   {
       private static HttpListener listener;
       //private static object commandData;
       private const string Url = "http://localhost:12345/revit/";

       public static object JsonConvert { get; private set; }
       private UIApplication uiApp;

       public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
       {
           //var uiapp = commandData.Application;
           //var app = uiapp.Application;
           // var uidoc = uiapp.ActiveUIDocument;
           //var doc = uidoc.Document;
           // Initialize the handler and the external event
           uiApp = commandData.Application;
           listener = new HttpListener();
           listener.Prefixes.Add(Url);

           try
           {
               listener.Start();
               TaskDialog.Show("Server", "Server started at " + Url);

               listener.BeginGetContext(ProcessRequest,null);
           }
           catch (HttpListenerException ex)
           {
               TaskDialog.Show("Error", ex.Message);
               return Result.Failed;
           }

           return Result.Succeeded;
       }

       private void ProcessRequest(IAsyncResult result)
       {
           var context = listener.EndGetContext(result);

           // Continue listening for other requests
           listener.BeginGetContext(ProcessRequest, null);

           HttpListenerRequest request = context.Request;
           HttpListenerResponse response = context.Response;
           int wallId;

           if (request.HttpMethod == "GET")
           {
               //  HandleGetRequest(response);

               // Convert parameters to appropriate types
               ElementId elementId = new ElementId(Convert.ToInt64(request.QueryString["ElementId"]));
               // Process the request
               if (int.TryParse(request.QueryString["ElementId"], out wallId))
                       {
                           // Run the move wall command with the specified wall id
                           MoveWallWithId(wallId);
                       }
               //Document doc = uiApp.ActiveUIDocument.Document;
               //Wall wall = doc.GetElement(elementId) as Wall;
               // Raise the external event to do the Revit API call on the main thread



               string responseString = "moveElementHandler.Result";

               // Your code to use the Revit API and interact with the model.
               //string responseString = "Revit interaction hv result2";


               // Send a response
               using (Stream output = context.Response.OutputStream)
               using (StreamWriter writer = new StreamWriter(output))
               {
                   writer.Write(responseString);
               }
           }
           response.Close();
       }

       private void MoveWallWithId(int wallId)
       {
           Document doc = uiApp.ActiveUIDocument.Document;
           ElementId elementId = new ElementId(wallId);
           Wall wall = doc.GetElement(elementId) as Wall;

           if (wall == null)
           {
               // Handle the error
               return;
           }

           MoveUsingLocationCurve(doc, wall);
       }

       private bool MoveUsingLocationCurve(Document doc, Wall wall)
       {
           // Check if the wall has a valid location curve
           TaskDialog.Show("Move element", "trying to move ");
           LocationCurve wallLocationCurve = wall.Location as LocationCurve;
           if (wallLocationCurve == null)
           {
               return false;
           }

           XYZ translationVec = new XYZ(10, 20, 0);

           // Start a new transaction for modifying the document
           using (Transaction trans = new Transaction(doc, "Move Wall"))
           {
               trans.Start();
               try
               {
                   // Perform the move operation
                   wallLocationCurve.Move(translationVec);
                   trans.Commit();
                   return true;
               }
               catch
               {
                   // Abort the transaction in case of any errors
                   trans.RollBack();
                   return false;
               }
           }
       }



   }