feat: add load more notifications on inbox (#17030)

Users need to see older notifications, so to make that happen, we added
a load more button at the end of the notifications list.

**Demo:**


https://github.com/user-attachments/assets/bd3d7964-a8f5-4164-8da0-9ba89ae88c9c

**What is missing?**
As you can notice, I didn't add tests for this feature. I tried, but I
didn't find a good solution for testing scroll events. However I was
able to get it working, but it was too cumbersome that I decided to
remove because of its maintenence burden.

site/src/api/api.ts

@@ -2434,9 +2434,13 @@ class ApiMethods {
 		return res.data;
 	};
 
-	getInboxNotifications = async () => {
+	getInboxNotifications = async (startingBeforeId?: string) => {
+		const params = new URLSearchParams();
+		if (startingBeforeId) {
+			params.append("starting_before", startingBeforeId);
+		}
 		const res = await this.axios.get<TypesGen.ListInboxNotificationsResponse>(
-			"/api/v2/notifications/inbox",
+			`/api/v2/notifications/inbox?${params.toString()}`,
 		);
 		return res.data;
 	};

site/src/components/ScrollArea/ScrollArea.tsx

@@ -18,7 +18,7 @@ export const ScrollArea = React.forwardRef<
 		<ScrollAreaPrimitive.Viewport className="h-full w-full rounded-[inherit]">
 			{children}
 		</ScrollAreaPrimitive.Viewport>
-		<ScrollBar />
+		<ScrollBar className="z-10" />
 		<ScrollAreaPrimitive.Corner />
 	</ScrollAreaPrimitive.Root>
 ));

site/src/modules/notifications/NotificationsInbox/InboxPopover.tsx

@@ -19,9 +19,12 @@ type InboxPopoverProps = {
 	notifications: readonly InboxNotification[] | undefined;
 	unreadCount: number;
 	error: unknown;
+	isLoadingMoreNotifications: boolean;
+	hasMoreNotifications: boolean;
 	onRetry: () => void;
 	onMarkAllAsRead: () => void;
 	onMarkNotificationAsRead: (notificationId: string) => void;
+	onLoadMoreNotifications: () => void;
 	defaultOpen?: boolean;
 };
 
@@ -30,9 +33,12 @@ export const InboxPopover: FC<InboxPopoverProps> = ({
 	unreadCount,
 	notifications,
 	error,
+	isLoadingMoreNotifications,
+	hasMoreNotifications,
 	onRetry,
 	onMarkAllAsRead,
 	onMarkNotificationAsRead,
+	onLoadMoreNotifications,
 }) => {
 	const [isOpen, setIsOpen] = useState(defaultOpen);
 
@@ -41,12 +47,21 @@ export const InboxPopover: FC<InboxPopoverProps> = ({
 			<PopoverTrigger asChild>
 				<InboxButton unreadCount={unreadCount} />
 			</PopoverTrigger>
-			<PopoverContent className="w-[466px]" align="end">
+			<PopoverContent
+				className="w-[var(--radix-popper-available-width)] max-w-[466px]"
+				align="end"
+			>
 				{/*
 				 * data-radix-scroll-area-viewport is used to set the max-height of the ScrollArea
 				 * https://github.com/shadcn-ui/ui/issues/542#issuecomment-2339361283
 				 */}
-				<ScrollArea className="[&>[data-radix-scroll-area-viewport]]:max-h-[calc(var(--radix-popover-content-available-height)-24px)]">
+				<ScrollArea
+					className={cn([
+						"[--bottom-offset:48px]",
+						"[--max-height:calc(var(--radix-popover-content-available-height)-var(--bottom-offset))]",
+						"[&>[data-radix-scroll-area-viewport]]:max-h-[var(--max-height)]",
+					])}
+				>
 					<div
 						className={cn([
 							"flex items-center justify-between p-3 border-0 border-b border-solid border-border",
@@ -94,6 +109,18 @@ export const InboxPopover: FC<InboxPopoverProps> = ({
 										onMarkNotificationAsRead={onMarkNotificationAsRead}
 									/>
 								))}
+								{hasMoreNotifications && (
+									<Button
+										variant="subtle"
+										size="sm"
+										disabled={isLoadingMoreNotifications}
+										onClick={onLoadMoreNotifications}
+										className="w-full"
+									>
+										<Spinner loading={isLoadingMoreNotifications} size="sm" />
+										Load more
+									</Button>
+								)}
 							</div>
 						) : (
 							<div className="p-6 flex items-center justify-center min-h-48">

site/src/modules/notifications/NotificationsInbox/NotificationsInbox.tsx

@@ -1,4 +1,4 @@
-import { API, watchInboxNotifications } from "api/api";
+import { watchInboxNotifications } from "api/api";
 import { getErrorDetail, getErrorMessage } from "api/errors";
 import type {
 	ListInboxNotificationsResponse,
@@ -11,10 +11,13 @@ import { useMutation, useQuery, useQueryClient } from "react-query";
 import { InboxPopover } from "./InboxPopover";
 
 const NOTIFICATIONS_QUERY_KEY = ["notifications"];
+const NOTIFICATIONS_LIMIT = 25; // This is hard set in the API
 
 type NotificationsInboxProps = {
 	defaultOpen?: boolean;
-	fetchNotifications: () => Promise<ListInboxNotificationsResponse>;
+	fetchNotifications: (
+		startingBeforeId?: string,
+	) => Promise<ListInboxNotificationsResponse>;
 	markAllAsRead: () => Promise<void>;
 	markNotificationAsRead: (
 		notificationId: string,
@@ -30,12 +33,12 @@ export const NotificationsInbox: FC<NotificationsInboxProps> = ({
 	const queryClient = useQueryClient();
 
 	const {
-		data: res,
+		data: inboxRes,
 		error,
 		refetch,
 	} = useQuery({
 		queryKey: NOTIFICATIONS_QUERY_KEY,
-		queryFn: fetchNotifications,
+		queryFn: () => fetchNotifications(),
 	});
 
 	const updateNotificationsCache = useEffectEvent(
@@ -75,6 +78,32 @@ export const NotificationsInbox: FC<NotificationsInboxProps> = ({
 		};
 	}, [updateNotificationsCache]);
 
+	const {
+		mutate: loadMoreNotifications,
+		isLoading: isLoadingMoreNotifications,
+	} = useMutation({
+		mutationFn: async () => {
+			if (!inboxRes || inboxRes.notifications.length === 0) {
+				return;
+			}
+			const lastNotification =
+				inboxRes.notifications[inboxRes.notifications.length - 1];
+			const newRes = await fetchNotifications(lastNotification.id);
+			updateNotificationsCache((prev) => {
+				return {
+					unread_count: newRes.unread_count,
+					notifications: [...prev.notifications, ...newRes.notifications],
+				};
+			});
+		},
+		onError: (error) => {
+			displayError(
+				getErrorMessage(error, "Error loading more notifications"),
+				getErrorDetail(error),
+			);
+		},
+	});
+
 	const markAllAsReadMutation = useMutation({
 		mutationFn: markAllAsRead,
 		onSuccess: () => {
@@ -122,12 +151,17 @@ export const NotificationsInbox: FC<NotificationsInboxProps> = ({
 	return (
 		<InboxPopover
 			defaultOpen={defaultOpen}
-			notifications={res?.notifications}
-			unreadCount={res?.unread_count ?? 0}
+			notifications={inboxRes?.notifications}
+			unreadCount={inboxRes?.unread_count ?? 0}
 			error={error}
+			isLoadingMoreNotifications={isLoadingMoreNotifications}
+			hasMoreNotifications={Boolean(
+				inboxRes && inboxRes.notifications.length === NOTIFICATIONS_LIMIT,
+			)}
 			onRetry={refetch}
 			onMarkAllAsRead={markAllAsReadMutation.mutate}
 			onMarkNotificationAsRead={markNotificationAsReadMutation.mutate}
+			onLoadMoreNotifications={loadMoreNotifications}
 		/>
 	);
 };