initial middleware implementation

lib/src/actions/actions.dart

@@ -238,6 +238,21 @@ abstract class LocalStorageDesignChoiceSet
   static Serializer<LocalStorageDesignChoiceSet> get serializer => _$localStorageDesignChoiceSetSerializer;
 }
 
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// set options for when to write design to localStorage
+
+abstract class ResetLocalStorage
+    with BuiltJsonSerializable
+    implements Action, Built<ResetLocalStorage, ResetLocalStorageBuilder> {
+
+  /************************ begin BuiltValue boilerplate ************************/
+  factory ResetLocalStorage() = _$ResetLocalStorage._;
+
+  ResetLocalStorage._();
+
+  static Serializer<ResetLocalStorage> get serializer => _$resetLocalStorageSerializer;
+}
+
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////
 // Clear helix selection when loading new design
 

lib/src/middleware/all_middleware.dart

@@ -23,6 +23,7 @@ import 'oxdna_export.dart';
 import 'periodic_save_design_local_storage.dart';
 import 'reselect_moved_dna_ends.dart';
 import 'reselect_moved_copied_strands.dart';
+import 'reset_local_storage.dart';
 import 'save_file.dart';
 import 'export_svg.dart';
 import 'local_storage.dart';
@@ -37,6 +38,7 @@ import 'autostaple_and_autobreak.dart';
 import 'zoom_speed.dart';
 
 final all_middleware = List<Middleware<AppState>>.unmodifiable([
+  reset_local_storage_middleware,
   local_storage_middleware,
   move_ensure_all_in_same_helix_group_middleware,
   forbid_create_circular_strand_no_crossovers_middleware,

lib/src/middleware/reset_local_storage.dart

@@ -0,0 +1,27 @@
+import 'dart:convert';
+import 'dart:html';
+
+import 'package:built_collection/built_collection.dart';
+import 'package:built_value/built_value.dart';
+import 'package:redux/redux.dart';
+import 'package:scadnano/src/state/design.dart';
+import '../state/app_ui_state_storables.dart';
+import '../serializers.dart';
+import '../state/local_storage_design_choice.dart';
+
+import '../json_serializable.dart';
+import '../state/app_state.dart';
+import '../actions/actions.dart' as actions;
+import '../util.dart' as util;
+import 'local_storage.dart';
+
+part 'reset_local_storage.g.dart';
+
+reset_local_storage_middleware(Store<AppState> store, dynamic action, NextDispatcher next) {
+  next(action);
+  if (action is actions.ResetLocalStorage) {
+    window.localStorage.remove(Storable.design.key_name);
+    window.localStorage.remove(Storable.app_ui_state_storables.key_name);
+    window.location.reload();
+  }
+}

lib/src/serializers.dart

@@ -58,6 +58,7 @@ import 'state/domain_name_mismatch.dart';
 part 'serializers.g.dart';
 
 @SerializersFor([
+  ResetLocalStorage,
   DNAAssignOptions,
   MoveHelicesToGroup,
   ModificationType,

lib/src/view/menu.dart

@@ -224,11 +224,8 @@ really want to exit without saving.'''
         ..key = 'import-cadnano')(),
       DropdownDivider({'key': 'divider-import-cadnano'}),
       (MenuDropdownItem()
-        ..on_click = ((_) {
-          window.localStorage.remove(Storable.design.key_name);
-          window.localStorage.remove(Storable.app_ui_state_storables.key_name);
-          window.location.reload();
-        })
+        ..on_click = ((_) => props.dispatch(
+              actions.ResetLocalStorage()))
         ..display = 'Reset Local Storage'
         ..tooltip = '''\
 If clicked, the design and local setting are reset and the webpage is reloaded.'''