Scenario: Add delete scenario command and use undo command.

src/View/Scenarios/GraphWidget.py

@@ -265,6 +265,9 @@ class GraphWidget(QGraphicsView):
         self.edge_items = []
 
         for scenar in self._study.scenarios.lst:
+            if scenar.is_deleted():
+                continue
+
             iscenar = ScenarioItem(scenar, self)
             self.scene().addItem(iscenar)
             self.scenarios_items[scenar] = iscenar
@@ -294,7 +297,8 @@ class GraphWidget(QGraphicsView):
     def scenario_has_child(self, scenario):
         for scenar in self._study.scenarios.lst:
             if scenar.parent is scenario:
-                return True
+                if not scenar.is_deleted():
+                    return True
 
         return False
 
@@ -409,23 +413,48 @@ class GraphWidget(QGraphicsView):
             return
 
         def fn():
+            self._close_other_window()
             self._study.save()
-            self._study.reload_from_scenario(item.scenario)
+            self._undo.push(
+                SelectScenariosCommand(
+                    self._study,
+                    item.scenario
+                )
+            )
+            # self._study.reload_from_scenario(item.scenario)
 
-        self._close_other_window()
         self.exec_with_waiting_window(fn, "select_scenario")
 
         self.changeScenario.emit(self.sender())
 
     def new_scenario(self, pos):
         def fn():
+            self._close_other_window()
             self._study.save()
-            scenario = self._study.new_scenario_from_current()
-            scenario.set_pos(pos.x(), pos.y())
+            self._undo.push(
+                AddScenariosCommand(
+                    self._study,
+                    pos
+                )
+            )
+            # scenario = self._study.new_scenario_from_current()
+            # scenario.set_pos(pos.x(), pos.y())
 
-        self._close_other_window()
         self.exec_with_waiting_window(fn, "new_scenario")
+        self.changeScenario.emit(self.sender())
 
+    def delete_scenario(self, item):
+        def fn():
+            self._close_other_window()
+            # self._study.save()
+            self._undo.push(
+                DeleteScenariosCommand(
+                    self._study,
+                    item.scenario
+                )
+            )
+
+        self.exec_with_waiting_window(fn, "delete_scenario")
         self.changeScenario.emit(self.sender())
 
     def _close_other_window(self):