Display application icon

matrixgw_frontend/src/widgets/messages/AppIconModifier.tsx

@@ -0,0 +1,26 @@
+import Favicon from "react-favicon";
+
+// Taken from https://github.com/element-hq/element-web/blob/0577e245dac944bd85eea07b93a9762a93062f62/src/favicon.ts
+function getInitialFavicon(): HTMLLinkElement[] {
+  const icons: HTMLLinkElement[] = [];
+  const links = window.document
+    .getElementsByTagName("head")[0]
+    .getElementsByTagName("link");
+  for (const link of links) {
+    if (
+      link.hasAttribute("rel") &&
+      /(^|\s)icon(\s|$)/i.test(link.getAttribute("rel")!)
+    ) {
+      icons.push(link);
+    }
+  }
+  return icons;
+}
+
+let iconPath = getInitialFavicon()[0].getAttribute("href")!;
+
+export function AppIconModifier(p: {
+  numberUnread: number;
+}): React.ReactElement {
+  return <Favicon url={iconPath} alertCount={p.numberUnread} />;
+}

matrixgw_frontend/src/widgets/messages/MainMessagesWidget.tsx

@@ -11,6 +11,7 @@ import type { WsMessage } from "../../api/WsApi";
 import { RoomEventsManager } from "../../utils/RoomEventsManager";
 import { AsyncWidget } from "../AsyncWidget";
 import { useUserInfo } from "../dashboard/BaseAuthenticatedPage";
+import { AppIconModifier } from "./AppIconModifier";
 import { MatrixWS } from "./MatrixWS";
 import { RoomSelector } from "./RoomSelector";
 import { RoomWidget } from "./RoomWidget";
@@ -70,6 +71,11 @@ function _MainMessageWidget(p: {
       );
   }, [space, p.rooms]);
 
+  const unreadRooms = React.useMemo(
+    () => p.rooms.filter((r) => r.number_unread_messages > 0).length,
+    [p.rooms]
+  );
+
   const [_refreshCount, setRefreshCount] = React.useState(0);
   const [roomMgr, setRoomMgr] = React.useState<undefined | RoomEventsManager>();
 
@@ -117,6 +123,9 @@ function _MainMessageWidget(p: {
         <MatrixWS onMessage={handleWsEvent} />
       </div>
 
+      {/** Application icon modifier */}
+      <AppIconModifier numberUnread={unreadRooms} />
+
       {/* Space selector */}
       <SpaceSelector {...p} selectedSpace={space} onChange={setSpace} />