async button

2 files changed, 115 insertions, 0 deletions

diff --git a/packages/web-util/src/components/Button.tsx b/packages/web-util/src/components/Button.tsx
new file mode 100644
index 000000000..758efafcf
--- /dev/null
+++ b/packages/web-util/src/components/Button.tsx
@@ -0,0 +1,114 @@
+import { OperationFail, OperationOk, OperationResult, TalerError, TranslatedString } from "@gnu-taler/taler-util";
+// import { NotificationMessage, notifyInfo } from "@gnu-taler/web-util/browser";
+import { Fragment, VNode, h } from "preact";
+import { HTMLAttributes, useEffect, useState, useTransition } from "preact/compat";
+import { NotificationMessage, buildRequestErrorMessage, notifyInfo, useTranslationContext } from "../index.browser.js";
+// import { useBankCoreApiContext } from "../context/config.js";
+
+// function errorMap<T extends OperationFail<unknown>>(resp: T, map: (d: T["case"]) => TranslatedString): void {
+
+export interface ButtonHandler<T extends OperationResult<A, B>, A, B> {
+  onClick: () => Promise<T | undefined>,
+  onNotification: (n: NotificationMessage) => void;
+  onOperationSuccess: ((result:T extends OperationOk<any> ? T :never) => void) | ((result:T extends OperationOk<any> ? T :never) => TranslatedString | undefined),
+  onOperationFail: (d: T extends OperationFail<any> ? T : never) => TranslatedString;
+  onOperationComplete?: () => void;
+}
+
+interface Props<T extends OperationResult<A, B>, A, B> extends HTMLAttributes<HTMLButtonElement> {
+  handler: ButtonHandler<T, A, B> | undefined,
+}
+
+/**
+ * This button accept an async function and report a notification
+ * on error or success.
+ * 
+ * When the async function is running the inner text will change into
+ * a "loading" animation.
+ * 
+ * @param param0 
+ * @returns 
+ */
+export function Button<T extends OperationResult<A, B>, A, B>({
+  handler,
+  children,
+  disabled,
+  onClick:clickEvent,
+  ...rest
+}: Props<T, A, B>): VNode {
+  const {i18n} = useTranslationContext();
+  const [running, setRunning] = useState(false)
+  return <button {...rest} disabled={disabled || running} onClick={(e) => {
+    e.preventDefault();
+    if (!handler) { return; }
+    setRunning(true)
+    handler.onClick().then((resp) => {
+      if (resp) {
+        if (resp.type === "ok") {
+          // @ts-expect-error this is an operationOk
+          const result: OperationOk<any> = resp.body
+          // @ts-expect-error this is an operationOk
+          const msg = handler.onOperationSuccess(result)
+          if (msg) {
+            notifyInfo(msg)
+          }
+        }
+        if (resp.type === "fail") {
+          // @ts-expect-error this is an operationFail
+          const error: OperationFail<any> = resp;
+          // @ts-expect-error this is an operationFail
+          const title = handler.onOperationFail(error)
+          handler.onNotification({
+            title,
+            type: "error",
+            description: error.detail.hint as TranslatedString,
+            debug: error.detail,
+          })
+        }
+      }
+      if (handler.onOperationComplete) {
+        handler.onOperationComplete()
+      }
+      setRunning(false)
+    }).catch(error => {
+      console.error(error)
+      
+      if (error instanceof TalerError) {
+        handler.onNotification(buildRequestErrorMessage(i18n, error))
+      } else {
+        const description = (error instanceof Error ?
+          error.message : String(error)) as TranslatedString
+  
+        handler.onNotification({
+          title: i18n.str`Operation failed`,
+          type: "error",
+          description,
+        })
+      }
+
+      if (handler.onOperationComplete) {
+        handler.onOperationComplete()
+      }
+      setRunning(false)
+    })
+  }} >
+    {running ? <Wait /> : children}
+  </button>
+}
+
+function Wait():VNode {
+  return <Fragment>
+    <style>{`
+      #l1 {          width: 120px;
+        height: 20px;
+        -webkit-mask: radial-gradient(circle closest-side, currentColor 90%, #0000) left/20% 100%;
+        background: linear-gradient(currentColor 0 0) left/0% 100% no-repeat #ddd;
+        animation: l17 2s infinite steps(6);
+      }
+      @keyframes l17 {
+          100% {background-size:120% 100%}
+`}
+    </style>
+    <div id="l1" />
+  </Fragment>
+}
diff --git a/packages/web-util/src/components/index.ts b/packages/web-util/src/components/index.ts
index d94502b48..4ef840c7d 100644
--- a/packages/web-util/src/components/index.ts
+++ b/packages/web-util/src/components/index.ts
@@ -6,6 +6,7 @@ export * from "./LangSelector.js";
 export * from "./Loading.js";
 export * from "./Header.js";
 export * from "./Footer.js";
+export * from "./Button.js";
 export * from "./ShowInputErrorLabel.js";
 export * from "./LocalNotificationBanner.js";
 export * from "./GlobalNotificationBanner.js";