Scenario: Add waiting dialog.

src/View/Scenarios/GraphWidget.py

@@ -34,6 +34,8 @@ from PyQt5.QtWidgets import (
     QGraphicsItem, QGraphicsTextItem, QMenu,
 )
 
+from View.WaitingDialog import WaitingDialog
+
 from View.Scenarios.UndoCommand import *
 from View.Scenarios.ContextMenu import (
     DefaultMenu, ScenarioMenu,
@@ -366,6 +368,14 @@ class GraphWidget(QGraphicsView):
         self.update()
         super(GraphWidget, self).mouseMoveEvent(event)
 
+    def exec_with_waiting_window(self, fn, action_str):
+        dlg = WaitingDialog(
+            payload_fn=fn,
+            title=action_str,
+            parent=self.parent
+        )
+        dlg.exec_()
+
     # Contextual menu
 
     def contextMenuEvent(self, event):
@@ -397,15 +407,18 @@ class GraphWidget(QGraphicsView):
         if type(item) is not ScenarioItem:
             return
 
-        self._study.save()
-        self._study.reload_from_scenario(item.scenario)
+        def fn():
+            self._study.save()
+            self._study.reload_from_scenario(item.scenario)
 
+        self.exec_with_waiting_window(fn, "select_scenario")
         self.changeScenario.emit(self.sender())
 
     def new_scenario(self, pos):
-        self._study.save()
-
-        scenario = self._study.new_scenario_from_current()
-        scenario.set_pos(pos.x(), pos.y())
+        def fn():
+            self._study.save()
+            scenario = self._study.new_scenario_from_current()
+            scenario.set_pos(pos.x(), pos.y())
 
+        self.exec_with_waiting_window(fn, "new_scenario")
         self.changeScenario.emit(self.sender())