Working on transitions between states

common/lib/xmodule/xmodule/combined_open_ended_module.py

@@ -121,6 +121,16 @@ class CombinedOpenEndedModule(XModule):
 
     def update_task_states(self):
         self.task_states[len(self.task_states)-1] = self.current_task.get_instance_state()
+        current_task_state=json.loads(self.task_states[len(self.task_states)-1])
+        if current_task_state['state']==self.DONE:
+            self.current_task_number+=1
+            if self.current_task_number==len(self.task_xml):
+                self.state=self.DONE
+                self.current_task_number=self.current_task_number-1
+            else:
+                self.state=self.INTERMEDIATE_DONE
+            self.setup_next_task()
+
 
     def handle_ajax(self, dispatch, get):
         return_html = self.current_task.handle_ajax(dispatch,get, self.system)