Scenario: Add delete scenario command and use undo command.

src/Model/Scenario.py

@@ -155,6 +155,9 @@ class Scenario(SQLSubModel):
         return scenarios
 
     def _db_save(self, execute, data=None):
+        if self.is_deleted():
+            return self.drop_all(execute)
+
         parent = 'NULL'
         if self.parent is not None:
             parent = self.parent._id
@@ -174,6 +177,33 @@ class Scenario(SQLSubModel):
 
         return True
 
+    def drop_all(self, execute):
+        execute(f"DELETE FROM scenario WHERE id = {self.id}")
+
+        tables = [
+            "additional_files",
+            "boundary_condition", "boundary_condition_data",
+            "lateral_contribution", "lateral_contribution_data",
+            "friction", "stricklers",
+            "hydraulic_structures",
+            "hydraulic_structures_basic", "hydraulic_structures_basic_value",
+            "initial_conditions",
+            "sedimentary_layer", "sedimentary_layer_layer",
+            "reservoir", "reservoir_data",
+            "rep_lines",
+            "solver_parameter",
+            "geometry_pointXYZ", "geometry_profileXYZ",
+            "river_reach", "river_node"
+        ]
+
+        for table in tables:
+            execute(
+                f"DELETE FROM {table} " +
+                f"WHERE scenario = {self.id}"
+            )
+
+        return True
+
     @property
     def id(self):
         return self._id

src/Model/Scenarios.py

@@ -68,3 +68,10 @@ class Scenarios(PamhyrModelDict):
                 self._dict
             )
         )
+
+    def delete(self, key):
+        el = self._dict.get(key)
+        if el is None:
+            return
+
+        el.set_as_deleted()

src/Model/Study.py

@@ -77,6 +77,8 @@ class Study(SQLModel):
 
         self._old_save_id = 0
 
+        self._river_scenario_cache = {}
+
     @classmethod
     def checkers(cls):
         lst = [
@@ -462,6 +464,10 @@ class Study(SQLModel):
         return new
 
     def reload_from_scenario(self, scenario):
+        if scenario in self._river_scenario_cache:
+            self._river = self._river_scenario_cache[scenario]
+            self.status.scenario = scenario
+        else:
             def sql_exec(sql):
                 return self.execute(
                     sql, fetch_one=False, commit=True
@@ -475,10 +481,12 @@ class Study(SQLModel):
             }
 
             # Reload river data
-        self._river = River._db_load(
+            river = River._db_load(
                 sql_exec,
                 data=data
             )
+            self._river_scenario_cache[scenario] = river
+            self._river = self._river
 
         if reduce(
                 lambda a, s: a or (s.parent is scenario),

src/Model/Tools/PamhyrDB.py

@@ -195,6 +195,9 @@ class SQLSubModel(PamhyrID):
         Returns:
             Nothing
         """
+        if self._status is None:
+            return
+
         self._owner_scenario = self._status.scenario_id
         self._status.modified()
 

src/View/Scenarios/ContextMenu.py

@@ -59,10 +59,10 @@ class ScenarioMenu(AbstractMenu):
         item = self._items[0]
 
         select = self._menu.addAction(self._trad["menu_select_scenario"])
-        # delete = self._menu.addAction(self._trad["menu_del_scenario"])
+        delete = self._menu.addAction(self._trad["menu_del_scenario"])
 
         action = self._exec()
         if action == select:
             self._parent.select_scenario(item)
-        # if action == delete:
-        #     self._parent.del_node(item)
+        if action == delete:
+            self._parent.delete_scenario(item)

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
@@ -294,6 +297,7 @@ class GraphWidget(QGraphicsView):
     def scenario_has_child(self, scenario):
         for scenar in self._study.scenarios.lst:
             if scenar.parent is scenario:
+                if not scenar.is_deleted():
                     return True
 
         return False
@@ -409,23 +413,48 @@ class GraphWidget(QGraphicsView):
             return
 
         def fn():
-            self._study.save()
-            self._study.reload_from_scenario(item.scenario)
-
             self._close_other_window()
+            self._study.save()
+            self._undo.push(
+                SelectScenariosCommand(
+                    self._study,
+                    item.scenario
+                )
+            )
+            # 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):
         def fn():
-            self._study.save()
-            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._study.save()
+            self._undo.push(
+                AddScenariosCommand(
+                    self._study,
+                    pos
+                )
+            )
+            # 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())
+
+    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):

src/View/Scenarios/UndoCommand.py

@@ -25,32 +25,59 @@ from PyQt5.QtWidgets import (
 
 
 class AddScenariosCommand(QUndoCommand):
-    def __init__(self, study, source):
+    def __init__(self, study, pos):
         QUndoCommand.__init__(self)
 
         self._study = study
-        self._source = source
+        self._pos = pos
+        self._new = None
 
     def undo(self):
-        logger.error(f"TODO {type(self)} : undo")
+        self._study.scenarios.delete(self._new.id)
+        self._study.reload_from_scenario(self._new.parent)
 
     def redo(self):
-        self._study.new_scenario_from_current(switch=False)
+        if self._new is None:
+            self._new = self._study.new_scenario_from_current()
+            self._new.set_pos(self._pos.x(), self._pos.y())
+        else:
+            self._new.set_as_not_deleted()
+            self._study.reload_from_scenario(self._new)
 
 
-class DelScenariosCommand(QUndoCommand):
+class SelectScenariosCommand(QUndoCommand):
+    def __init__(self, study, new):
+        QUndoCommand.__init__(self)
+
+        self._study = study
+        self._old = study.status.scenario
+        self._new = new
+
+    def undo(self):
+        self._study.reload_from_scenario(self._old)
+
+    def redo(self):
+        self._study.reload_from_scenario(self._new)
+
+
+class DeleteScenariosCommand(QUndoCommand):
     def __init__(self, study, scenario):
         QUndoCommand.__init__(self)
 
         self._study = study
         self._scenario = scenario
+        self._reload = study.status.scenario == scenario
 
     def undo(self):
-        logger.error(f"TODO {type(self)} : undo")
+        self._scenario.set_as_not_deleted()
+        if self._reload:
+            self._study.reload_from_scenario(self._scenario)
 
     def redo(self):
-        logger.error(f"TODO {type(self)} : redo")
+        if self._reload:
+            self._study.reload_from_scenario(self._scenario.parent)
 
+        self._scenario.set_as_deleted()
 
 class SetCommand(QUndoCommand):
     def __init__(self, scenario, column, new_value):

src/View/Scenarios/Window.py

@@ -39,6 +39,7 @@ from PyQt5.QtWidgets import (
 from Modules import Modules
 from Model.River import RiverNode, RiverReach, River
 
+from View.WaitingDialog import WaitingDialog
 from View.Tools.PamhyrWindow import PamhyrWindow
 from View.Scenarios.GraphWidget import GraphWidget
 from View.Scenarios.UndoCommand import *
@@ -114,11 +115,31 @@ class ScenariosWindow(PamhyrWindow):
         self._graph_widget.changeScenario.connect(self.update)
 
     def _undo(self):
+        def fn():
             self._undo_stack.undo()
+
+        dlg = WaitingDialog(
+            payload_fn=fn,
+            title="undo_waiting",
+            trad=self._trad,
+            parent=self
+        )
+        dlg.exec_()
+
         self.update()
 
     def _redo(self):
+        def fn():
             self._undo_stack.redo()
+
+        dlg = WaitingDialog(
+            payload_fn=fn,
+            title="redo_waiting",
+            trad=self._trad,
+            parent=self
+        )
+        dlg.exec_()
+
         self.update()
 
     def update(self):

src/View/Scenarios/translate.py

@@ -37,6 +37,9 @@ class ScenariosTranslate(MainTranslate):
         self._dict["menu_add_scenario"] = _translate(
             "Scenarios", "Create new scenario from current scenario"
         )
+        self._dict["menu_del_scenario"] = _translate(
+            "Scenarios", "Delete this scenario"
+        )
 
         self._sub_dict["table_headers_scenarios"] = {
             # "id": self._dict['id'],
@@ -48,6 +51,15 @@ class ScenariosTranslate(MainTranslate):
         self._dict["new_scenario"] = _translate(
             "Scenarios", "Create new scenario"
         )
+        self._dict["delete_scenario"] = _translate(
+            "Scenarios", "Delete scenario"
+        )
         self._dict["select_scenario"] = _translate(
             "Scenarios", "Select scenario"
         )
+        self._dict["undo_waiting"] = _translate(
+            "Scenarios", "Undo ..."
+        )
+        self._dict["redo_waiting"] = _translate(
+            "Scenarios", "Redo ..."
+        )