loadable error screen, reload actions, autoreload

lib/state/app/infrastructure/utilityWidgets/loadableHydratedBloc/loadable_hydrated_bloc.dart

@@ -1,28 +1,58 @@
+import 'dart:developer';
+
 import 'package:hydrated_bloc/hydrated_bloc.dart';
 
+import '../../loadableState/loading_error.dart';
 import '../../repository/repository.dart';
 import 'loadable_hydrated_bloc_event.dart';
 import '../../loadableState/loadable_state.dart';
 
-abstract class LoadableHydratedBloc<TEvent extends LoadableHydratedBlocEvent<TState>, TState, TRepository extends Repository<TState>> extends HydratedBloc<LoadableHydratedBlocEvent<TState>, LoadableState<TState>> {
+abstract class LoadableHydratedBloc<
+  TEvent extends LoadableHydratedBlocEvent<TState>,
+  TState,
+  TRepository extends Repository<TState>
+> extends HydratedBloc<
+    LoadableHydratedBlocEvent<TState>,
+    LoadableState<TState>
+> {
   late TRepository _repository;
   LoadableHydratedBloc() : super(const LoadableState()) {
     on<Emit<TState>>((event, emit) => emit(LoadableState(isLoading: event.loading, data: event.state(innerState ?? fromNothing()))));
+    on<Reload<TState>>((event, emit) => emit(LoadableState(isLoading: true, data: innerState)));
     on<ClearState<TState>>((event, emit) => emit(const LoadableState()));
-    
+    on<Error<TState>>((event, emit) => emit(LoadableState(isLoading: false, data: innerState, error: event.error)));
+
     _repository = repository();
-    loadState();
+    fetch();
   }
 
   TState? get innerState => state.data;
   TRepository get repo => _repository;
 
+  void fetch() {
+    gatherData().catchError(
+      (e) => add(
+        Error(
+          LoadingError(
+            message: e.toString(),
+            enableRetry: true,
+            retry: () {
+              log('Fetch retry on ${TState.toString()}');
+              add(Reload<TState>());
+              fetch();
+            }
+          )
+        )
+      )
+    );
+  }
+
   @override
   fromJson(Map<String, dynamic> json) => LoadableState(isLoading: true, data: fromStorage(json));
   @override
   Map<String, dynamic>? toJson(LoadableState<TState> state) => state.data == null ? {} : state.data.toJson();
 
-  Future<void> loadState();
+  Future<void> gatherData();
   TRepository repository();
 
   TState fromNothing();

lib/state/app/infrastructure/utilityWidgets/loadableHydratedBloc/loadable_hydrated_bloc_event.dart

@@ -1,7 +1,14 @@
+import '../../loadableState/loading_error.dart';
+
 class LoadableHydratedBlocEvent<TState> {}
 class Emit<TState> extends LoadableHydratedBlocEvent<TState> {
   final TState Function(TState state) state;
   final bool loading;
   Emit(this.state, {this.loading = false});
 }
-class ClearState<TState> extends LoadableHydratedBlocEvent<TState> {}
+class ClearState<TState> extends LoadableHydratedBlocEvent<TState> {}
+class Error<TState> extends LoadableHydratedBlocEvent<TState> {
+  final LoadingError error;
+  Error(this.error);
+}
+class Reload<TState> extends LoadableHydratedBlocEvent<TState> {}