snapshot of https://github.com/RocketChat/Rocket.Chat.git (develop, 2026-09-16; blobs > 131072B omitted)

apps/meteor/client/views/room/body/hooks/useHasNewMessages.ts

@@ -0,0 +1,90 @@
+import type { IMessage } from '@rocket.chat/core-typings';
+import { isEditedMessage } from '@rocket.chat/core-typings';
+import { useDebouncedCallback } from '@rocket.chat/fuselage-hooks';
+import { clientCallbacks } from '@rocket.chat/ui-client';
+import type { Dispatch, MutableRefObject, SetStateAction } from 'react';
+import { useCallback, useEffect, useState } from 'react';
+
+import { RoomHistoryManager } from '../../../../lib/RoomHistoryManager';
+import { useChat } from '../../contexts/ChatContext';
+
+export const useHasNewMessages = (
+	rid: string,
+	uid: string | undefined,
+	setShouldJumpToBottom: Dispatch<SetStateAction<boolean>>,
+	isAtBottom: MutableRefObject<boolean>,
+) => {
+	const chat = useChat();
+
+	if (!chat) {
+		throw new Error('No ChatContext provided');
+	}
+
+	const [hasNewMessages, setHasNewMessages] = useState(false);
+
+	const handleNewMessageButtonClick = useCallback(() => {
+		setShouldJumpToBottom(true);
+		setHasNewMessages(false);
+		chat.composer?.focus();
+	}, [setShouldJumpToBottom, chat.composer]);
+
+	const handleJumpToRecentButtonClick = useCallback(async () => {
+		RoomHistoryManager.clear(rid);
+		await RoomHistoryManager.getMoreIfIsEmpty(rid);
+		setShouldJumpToBottom(true);
+	}, [setShouldJumpToBottom, rid]);
+
+	const handleComposerResize = useCallback((): void => {
+		setShouldJumpToBottom(true);
+		setHasNewMessages(false);
+	}, [setShouldJumpToBottom]);
+
+	useEffect(() => {
+		clientCallbacks.add(
+			'streamNewMessage',
+			(msg: IMessage) => {
+				if (rid !== msg.rid || isEditedMessage(msg) || msg.tmid) {
+					return;
+				}
+
+				if (msg.u._id === uid) {
+					// If there are more next messages, jump to the recent messages
+					if (RoomHistoryManager.hasMoreNext(rid)) {
+						return handleJumpToRecentButtonClick();
+					}
+					setShouldJumpToBottom(true);
+					setHasNewMessages(false);
+					return;
+				}
+
+				if (!isAtBottom.current) {
+					setHasNewMessages(true);
+				}
+			},
+			clientCallbacks.priority.MEDIUM,
+			rid,
+		);
+
+		return () => {
+			clientCallbacks.remove('streamNewMessage', rid);
+		};
+	}, [handleJumpToRecentButtonClick, isAtBottom, rid, setShouldJumpToBottom, uid]);
+
+	const debouncedClearNewMessagesOnScroll = useDebouncedCallback(
+		() => {
+			if (isAtBottom.current) {
+				setHasNewMessages(false);
+			}
+		},
+		100,
+		[],
+	);
+
+	return {
+		debouncedClearNewMessagesOnScroll,
+		handleNewMessageButtonClick,
+		handleJumpToRecentButtonClick,
+		handleComposerResize,
+		hasNewMessages,
+	};
+};