21 add pagestate

lib/common/page_state/page_state.dart

@@ -0,0 +1,32 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+part 'page_state.freezed.dart';
+
+typedef SimplePageState<T> = PageState<T, void, void, void, dynamic>;
+
+/// A kind of PageState where you already have a previous data, before loading the page
+typedef HydratedPageState<T> = PageState<T, void, T, T, dynamic>;
+
+@freezed
+class PageState<T, Tidle, Tloading, Tempty, Tfailure> with _$PageState {
+  const PageState._();
+
+  factory PageState.idle([Tidle? data]) = _PageStateIdle;
+
+  factory PageState.loading([Tloading? data]) = _PageStateLoading;
+
+  factory PageState.loaded({required T data}) = _PageStateLoaded;
+
+  factory PageState.empty({Tempty? data}) = _PageStateEmpty;
+
+  factory PageState.failure([Tfailure? data]) = _PageStateFailure;
+
+  bool get isIdle => this is _PageStateIdle;
+
+  bool get isLoading => this is _PageStateLoading;
+
+  bool get isLoaded => this is _PageStateLoaded;
+
+  bool get isEmpty => this is _PageStateEmpty;
+
+  bool get isFailure => this is _PageStateFailure;
+}