refactor(Scrollbar, Chat, Messages): improve scroll handling and clean up component structure

src/renderer/src/components/Scrollbar/index.tsx

@@ -12,33 +12,41 @@ const Scrollbar: FC<Props> = ({ ref: passedRef, right, children, onScroll: exter
   const [isScrolling, setIsScrolling] = useState(false)
   const timeoutRef = useRef<NodeJS.Timeout | null>(null)
 
-  const handleScroll = useCallback(() => {
-    setIsScrolling(true)
-
+  const clearScrollingTimeout = useCallback(() => {
     if (timeoutRef.current) {
       clearTimeout(timeoutRef.current)
+      timeoutRef.current = null
     }
-
-    timeoutRef.current = setTimeout(() => setIsScrolling(false), 1500)
   }, [])
 
-  const throttledInternalScrollHandler = throttle(handleScroll, 200)
+  const handleScroll = useCallback(() => {
+    setIsScrolling(true)
+    clearScrollingTimeout()
+    timeoutRef.current = setTimeout(() => {
+      setIsScrolling(false)
+      timeoutRef.current = null
+    }, 1000)
+  }, [clearScrollingTimeout])
+
+  // eslint-disable-next-line react-hooks/exhaustive-deps
+  const throttledInternalScrollHandler = useCallback(throttle(handleScroll, 100, { leading: true, trailing: true }), [
+    handleScroll
+  ])
 
   // Combined scroll handler
   const combinedOnScroll = useCallback(() => {
-    // Event is available if needed by internal handler
-    throttledInternalScrollHandler() // Call internal logic
+    throttledInternalScrollHandler()
     if (externalOnScroll) {
-      externalOnScroll() // Call external logic (from useScrollPosition)
+      externalOnScroll()
     }
   }, [throttledInternalScrollHandler, externalOnScroll])
 
   useEffect(() => {
     return () => {
-      timeoutRef.current && clearTimeout(timeoutRef.current)
+      clearScrollingTimeout()
       throttledInternalScrollHandler.cancel()
     }
-  }, [throttledInternalScrollHandler])
+  }, [throttledInternalScrollHandler, clearScrollingTimeout])
 
   return (
     <Container

src/renderer/src/pages/home/Chat.tsx

@@ -114,16 +114,14 @@ const Chat: FC<Props> = (props) => {
           includeUser={filterIncludeUser}
           onIncludeUserChange={userOutlinedItemClickHandler}
         />
-        <MessagesContainer className="messages-container">
-          <Messages
-            key={props.activeTopic.id}
-            assistant={assistant}
-            topic={props.activeTopic}
-            setActiveTopic={props.setActiveTopic}
-            onComponentUpdate={messagesComponentUpdateHandler}
-            onFirstUpdate={messagesComponentFirstUpdateHandler}
-          />
-        </MessagesContainer>
+        <Messages
+          key={props.activeTopic.id}
+          assistant={assistant}
+          topic={props.activeTopic}
+          setActiveTopic={props.setActiveTopic}
+          onComponentUpdate={messagesComponentUpdateHandler}
+          onFirstUpdate={messagesComponentFirstUpdateHandler}
+        />
         <QuickPanelProvider>
           <Inputbar assistant={assistant} setActiveTopic={props.setActiveTopic} topic={props.activeTopic} />
           {isMultiSelectMode && <MultiSelectActionPopup topic={props.activeTopic} />}
@@ -142,13 +140,6 @@ const Chat: FC<Props> = (props) => {
   )
 }
 
-const MessagesContainer = styled.div`
-  display: flex;
-  flex-direction: column;
-  overflow: hidden;
-  flex: 1;
-`
-
 const Container = styled.div`
   display: flex;
   flex-direction: row;

src/renderer/src/pages/home/Messages/Messages.tsx

@@ -53,7 +53,7 @@ const Messages: React.FC<MessagesProps> = ({ assistant, topic, setActiveTopic, o
     `topic-${topic.id}`
   )
   const { t } = useTranslation()
-  const { showPrompt, showTopics, topicPosition, showAssistants, messageNavigation } = useSettings()
+  const { showPrompt, topicPosition, messageNavigation } = useSettings()
   const { updateTopic, addTopic } = useAssistant(assistant.id)
   const dispatch = useAppDispatch()
   const [displayMessages, setDisplayMessages] = useState<Message[]>([])
@@ -267,8 +267,9 @@ const Messages: React.FC<MessagesProps> = ({ assistant, topic, setActiveTopic, o
 
   const groupedMessages = useMemo(() => Object.entries(getGroupedMessages(displayMessages)), [displayMessages])
   return (
-    <Container
+    <MessagesContainer
       id="messages"
+      className="messages-container"
       ref={scrollContainerRef}
       style={{ position: 'relative', paddingTop: showPrompt ? 10 : 0 }}
       key={assistant.id}
@@ -304,14 +305,13 @@ const Messages: React.FC<MessagesProps> = ({ assistant, topic, setActiveTopic, o
       </NarrowLayout>
       {messageNavigation === 'anchor' && <MessageAnchorLine messages={displayMessages} />}
       {messageNavigation === 'buttons' && <ChatNavigation containerId="messages" />}
-
       <SelectionBox
         isMultiSelectMode={isMultiSelectMode}
         scrollContainerRef={scrollContainerRef}
         messageElements={messageElements.current}
         handleSelectMessage={handleSelectMessage}
       />
-    </Container>
+    </MessagesContainer>
   )
 }
 
@@ -369,7 +369,7 @@ interface ContainerProps {
   $right?: boolean
 }
 
-const Container = styled(Scrollbar)<ContainerProps>`
+const MessagesContainer = styled(Scrollbar)<ContainerProps>`
   display: flex;
   flex-direction: column-reverse;
   padding: 10px 0 20px;