1 files changed, 82 insertions, 0 deletions
diff --git a/packages/taler-wallet-webextension/src/mui/handlers.ts b/packages/taler-wallet-webextension/src/mui/handlers.ts
new file mode 100644
index 000000000..a194bd02a
--- /dev/null
+++ b/packages/taler-wallet-webextension/src/mui/handlers.ts
@@ -0,0 +1,82 @@
+/*
+ This file is part of GNU Taler
+ (C) 2022 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 { AmountJson } from "@gnu-taler/taler-util";
+
+export interface TextFieldHandler {
+  onInput?: SafeHandler<string>;
+  value: string;
+  error?: string | Error;
+}
+
+export interface AmountFieldHandler {
+  onInput?: SafeHandler<AmountJson>;
+  value: AmountJson;
+  error?: string | Error;
+}
+
+declare const __safe_handler: unique symbol;
+export type SafeHandler<T> = {
+  <Req extends T>(req: Req): Promise<void>;
+  (): Promise<void>;
+  [__safe_handler]: true;
+};
+
+type UnsafeHandler<T> = ((p: T) => Promise<void>) | ((p: T) => void);
+
+export function withSafe<T>(
+  handler: UnsafeHandler<T>,
+  onError: (e: Error) => void,
+): SafeHandler<T> {
+  const sh = async function (p: T): Promise<void> {
+    try {
+      await handler(p);
+    } catch (e) {
+      if (e instanceof Error) {
+        onError(e);
+      } else {
+        onError(new Error(String(e)));
+      }
+    }
+  };
+  return sh as SafeHandler<T>;
+}
+
+export const nullFunction = async function (): Promise<void> {
+  //do nothing
+} as SafeHandler<void>;
+
+//FIXME: UI button should required SafeHandler but
+//useStateComponent should not be required to create SafeHandlers
+//so this need to be split in two:
+// * ButtonHandlerUI =>  with i18n
+// * ButtonHandlerLogic => without i18n
+export interface ButtonHandler {
+  onClick?: SafeHandler<void>;
+  // error?: TalerError;
+}
+
+export interface ToggleHandler {
+  value?: boolean;
+  button: ButtonHandler;
+}
+
+export interface SelectFieldHandler {
+  onChange?: SafeHandler<string>;
+  error?: string;
+  value: string;
+  isDirty?: boolean;
+  list: Record<string, string>;
+}