2 files changed, 123 insertions, 2 deletions
diff --git a/packages/demobank-ui/src/context/pageState.ts b/packages/demobank-ui/src/context/pageState.ts
new file mode 100644
index 000000000..3d7ccd85b
--- /dev/null
+++ b/packages/demobank-ui/src/context/pageState.ts
@@ -0,0 +1,121 @@
+/*
+ This file is part of GNU Taler
+ (C) 2021 Taler Systems S.A.
+
+ GNU Taler is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+import { hooks } from "@gnu-taler/web-util/lib/index.browser";
+import { ComponentChildren, createContext, h, VNode } from "preact";
+import { StateUpdater, useContext } from "preact/hooks";
+
+/**
+ *
+ * @author Sebastian Javier Marchano (sebasjm)
+ */
+
+export type Type = {
+  pageState: PageStateType;
+  pageStateSetter: StateUpdater<PageStateType>;
+};
+const initial: Type = {
+  pageState: {
+    isLoggedIn: false,
+    isRawPayto: false,
+    showPublicHistories: false,
+    withdrawalInProgress: false,
+  },
+  pageStateSetter: () => {
+    null;
+  },
+};
+const Context = createContext<Type>(initial);
+
+export const usePageContext = (): Type => useContext(Context);
+
+export const PageStateProvider = ({
+  children,
+}: {
+  children: ComponentChildren;
+}): VNode => {
+  const [pageState, pageStateSetter] = usePageState();
+
+  return h(Context.Provider, {
+    value: { pageState, pageStateSetter },
+    children,
+  });
+};
+
+/**
+ * Wrapper providing defaults.
+ */
+function usePageState(
+  state: PageStateType = {
+    isLoggedIn: false,
+    isRawPayto: false,
+    showPublicHistories: false,
+    withdrawalInProgress: false,
+  },
+): [PageStateType, StateUpdater<PageStateType>] {
+  const ret = hooks.useNotNullLocalStorage("page-state", JSON.stringify(state));
+  const retObj: PageStateType = JSON.parse(ret[0]);
+
+  const retSetter: StateUpdater<PageStateType> = function (val) {
+    const newVal =
+      val instanceof Function
+        ? JSON.stringify(val(retObj))
+        : JSON.stringify(val);
+
+    ret[1](newVal);
+  };
+
+  //when moving from one page to another
+  //clean up the info and error bar
+  function removeLatestInfo(val: any): ReturnType<typeof retSetter> {
+    const updater = typeof val === "function" ? val : (c: any) => val;
+    return retSetter((current: any) => {
+      const cleanedCurrent: PageStateType = {
+        ...current,
+        info: undefined,
+        errors: undefined,
+        timestamp: new Date().getTime(),
+      };
+      return updater(cleanedCurrent);
+    });
+  }
+
+  return [retObj, removeLatestInfo];
+}
+
+/**
+ * Track page state.
+ */
+export interface PageStateType {
+  isLoggedIn: boolean;
+  isRawPayto: boolean;
+  showPublicHistories: boolean;
+  withdrawalInProgress: boolean;
+  error?: {
+    description?: string;
+    title: string;
+    debug?: string;
+  };
+
+  info?: string;
+  talerWithdrawUri?: string;
+  /**
+   * Not strictly a presentational value, could
+   * be moved in a future "withdrawal state" object.
+   */
+  withdrawalId?: string;
+  timestamp?: number;
+}
diff --git a/packages/demobank-ui/src/context/translation.ts b/packages/demobank-ui/src/context/translation.ts
index a50f81b86..478bdbde0 100644
--- a/packages/demobank-ui/src/context/translation.ts
+++ b/packages/demobank-ui/src/context/translation.ts
@@ -22,7 +22,7 @@
 import { i18n, setupI18n } from "@gnu-taler/taler-util";
 import { createContext, h, VNode } from "preact";
 import { useContext, useEffect } from "preact/hooks";
-import { useLang } from "../hooks/useLang.js";
+import { hooks } from "@gnu-taler/web-util/lib/index.browser";
 import { strings } from "../i18n/strings.js";
 
 interface Type {
@@ -70,7 +70,7 @@ export const TranslationProvider = ({
   children,
   forceLang,
 }: Props): VNode => {
-  const [lang, changeLanguage, isSaved] = useLang(initial);
+  const [lang, changeLanguage, isSaved] = hooks.useLang(initial);
   useEffect(() => {
     if (forceLang) {
       changeLanguage(forceLang);