Drawing formatting gets scattered while applying UI parameters after loading drawing (Creo Toolkit)

Hi everyone,

I am facing an issue in my Creo Toolkit application and would appreciate any suggestions.

Workflow

1. I launch my Toolkit application.
2. A UI dialog is displayed where the user enters the required drawing parameters.
3. When the user clicks the Apply button, the drawing is loaded using ProMdlFiletypeLoad().
4. I then apply a drawing setup (.dtl) file using ProInputFileRead().
5. The model parameters are updated.
6. The model and drawing are regenerated.

Problem

When the drawing is first loaded, it appears correctly with the expected formatting and DTL settings.

However, as soon as the parameter update/regeneration begins, the drawing temporarily becomes scattered. Dimensions, tables, notes, and other annotations move from their correct locations, almost as if the drawing is momentarily using a different unit system (for example, inches instead of millimeters).

I would like to prevent the user from seeing this intermediate scattered state.

My questions

• Is this expected behavior when loading a drawing and then updating model parameters through Creo Toolkit?
• Is there a recommended sequence of Toolkit API calls to avoid this intermediate display?
• Should the drawing remain hidden until after parameter updates and regeneration are complete?
• Is there a way to regenerate the drawing completely before it is displayed to the user?

Below is my ApplyAction() function that implements this workflow.

// ApplyAction() implementation

Any guidance would be greatly appreciated. Thank you!

	void ApplyAction(char* dialog, char* component, ProAppData app_data)
	{
		HandClearanceUiState* state = (HandClearanceUiState*)app_data;
		if (state == NULL)
		{
			return;
		}

		state->pending_params.clear();

		//----------------------------------------------------------------------
		// Read UI values
		//----------------------------------------------------------------------
		ProError status = LoadCalibreFromDialog(dialog, state);
		if (status != PRO_TK_NO_ERROR)
		{
			visit_items::log_info("Apply skipped because calibre is invalid.");
			return;
		}

		status = ReadManualInputsFromDialog(dialog, state);
		if (status != PRO_TK_NO_ERROR)
		{
			visit_items::log_info("Apply skipped because manual UI input could not be read.");
			return;
		}

		status = UpdateAutoOdInputs(dialog, state);
		if (status != PRO_TK_NO_ERROR)
		{
			visit_items::log_info("Apply skipped because auto OD values could not be calculated.");
			return;
		}

		//----------------------------------------------------------------------
		// Load drawing only once
		//----------------------------------------------------------------------
		if (state->drawing == NULL)
		{

			ProMdl drawing_mdl = NULL;

			status = ProMdlFiletypeLoad(
				L"D:\\CREO_TOOLKIT_CODE\\automation_day_three\\3H_master_model_2298XXE_caliber_2305\\hands_clearence_3h.drw",
				PRO_MDLFILE_DRAWING,
				PRO_B_FALSE,
				&drawing_mdl);

			state->drawing = (ProDrawing)drawing_mdl;

			// Load the DTL file into the drawing
			ProDirectoryChange(
				L"D:\\CREO_TOOLKIT_CODE\\automation_day_three\\hand_clearence_poc\\text");


			status = ProInputFileRead(
				NULL,
				L"D:\\CREO_TOOLKIT_CODE\\automation_day_three\\hand_clearence_poc\\config.pro",
				PRO_CONFIG_FILE,
				NULL, NULL, NULL, NULL);

			visit_items::CheckError(status, "ProInputFileRead config.pro");

			status = ProInputFileRead(
				state->drawing,
				L"drawing_setting.dtl",
				PRO_DWG_SETUP_FILE,
				NULL, NULL, NULL, NULL);

			visit_items::CheckError(status, "ProInputFileRead dtl");


			// Display drawing
			status = ProMdlDisplay(state->drawing);
			visit_items::CheckError(status, "ProMdlDisplay");


			if (status != PRO_TK_NO_ERROR)
			{
				state->last_error = status;
				return;
			}

			state->drawing = (ProDrawing)drawing_mdl;



			int window;
			if (ProMdlWindowGet(drawing_mdl, &window) == PRO_TK_NO_ERROR)
			{
				ProWindowActivate(window);
			}

			ProWindowRepaint(PRO_VALUE_UNUSED);

			// Get the model referenced by the drawing
			status = ProDrawingCurrentsolidGet(
				state->drawing,
				&state->solid);

			visit_items::CheckError(status, "ProDrawingCurrentsolidGet");

			if (status != PRO_TK_NO_ERROR)
			{
				state->last_error = status;
				return;
			}
		}

		//----------------------------------------------------------------------
		// Update parameters
		//----------------------------------------------------------------------
		status = UpdateCreoParameters(
			state->solid,
			state->pending_params);

		if (status != PRO_TK_NO_ERROR)
		{
			state->last_error = status;
			return;
		}

		//----------------------------------------------------------------------
		// Regenerate
		//----------------------------------------------------------------------
		status = visit_items::RegenerateDrawingAndRepaint(
			state->drawing,
			state->solid);

		state->last_error = status;

		if (status != PRO_TK_NO_ERROR)
		{
			return;
		}



		//----------------------------------------------------------------------
		// Update drawing
		//----------------------------------------------------------------------
		std::wstring report = ClearanceErrors(state->pending_params);

		hand_clearance_ui::FillDrwTables(state->drawing);

		hand_clearance_ui::AutoSacleFitDrawing(state->drawing);

		DimensionPosition(state->drawing);

		//----------------------------------------------------------------------
		// Apply drawing text rule
		//----------------------------------------------------------------------
		status = HandleHandOverVgp(dialog, state);

		state->last_error = status;
	}