Creating a new file clears tables and sbml model.

src/petab_gui/controllers/mother_controller.py

@@ -702,12 +702,10 @@ def new_file(self):
             )
             if reply == QMessageBox.Save:
                 self.save_model()
-        for controller in [
-            self.measurement_controller,
-            self.observable_controller,
-            self.parameter_controller,
-            self.condition_controller,
-        ]:
+        for controller in self.controllers:
+            if controller == self.sbml_controller:
+                controller.clear_model()
+                continue
             controller.clear_table()
 
     def check_model(self):
@@ -942,8 +940,8 @@ def simulate(self):
         petab_problem = self.model.current_petab_problem
 
         # import petabsimualtor
-        from basico.petab import PetabSimulator
         import basico
+        from basico.petab import PetabSimulator
 
         # report current basico / COPASI version
         self.logger.log_message(f"Simulate with basico: {basico.__version__}, COPASI: {basico.COPASI.__version__}", color="green")

src/petab_gui/controllers/sbml_controller.py

@@ -126,3 +126,12 @@ def overwrite_sbml(self, file_path=None):
             self.logger.log_message(
                 f"Failed to open SBML file: {str(e)}", color="red"
             )
+
+    def clear_model(self):
+        """Clear the model in case the user wants to start a new problem"""
+        self.model.antimony_text = ""
+        self.model.convert_antimony_to_sbml()
+        self.view.sbml_text_edit.setPlainText(self.model.sbml_text)
+        self.view.antimony_text_edit.setPlainText(self.model.antimony_text)
+        self.overwritten_model.emit()
+