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PRD-2153: Allow user to scroll up while response is generating #44

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Merged
veliseev93 merged 3 commits into from
Feb 19, 2026
Merged

PRD-2153: Allow user to scroll up while response is generating #44

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33ed906
fix: allow user to scroll up while response is generating
Feb 6, 2026
2a9bca9
fix: enable maintainVisibleContentPosition startRenderingFromBottom
Feb 11, 2026
e91293d
fix: improved auto scroll behavior while response is generating
Feb 19, 2026
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40 changes: 30 additions & 10 deletions libs/mobile/chat/features/chat/src/lib/components/messages-list/component.tsx
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Original file line number Diff line number Diff line change
@@ -1,8 +1,8 @@
import { FlashList } from '@shopify/flash-list';
import { useLocalSearchParams } from 'expo-router';
import { delay } from 'lodash-es';
import React, { ReactElement, useCallback, useRef, useState } from 'react';
import { NativeScrollEvent, NativeSyntheticEvent } from 'react-native';
import React, { ReactElement, useCallback, useRef } from 'react';
import { GestureResponderEvent, NativeScrollEvent, NativeSyntheticEvent } from 'react-native';
import { useSharedValue, withTiming } from 'react-native-reanimated';
import { AiMessageActions } from '@open-webui-react-native/mobile/chat/features/ai-message-actions';
import { useManageMessageSiblings } from '@open-webui-react-native/mobile/chat/features/use-manage-messages-siblings';
Expand Down Expand Up @@ -62,7 +62,8 @@ export default function ChatMessagesList({
const isScrollToBottomAvailableTimeout = useRef<NodeJS.Timeout | null | number>(null); //NOTE: number needs to fix pipeline lint error
const isScrollToBottomVisible = useSharedValue(0);
const previousScrollY = useRef(0);
const [autoscrollToBottomThreshold, setAutoscrollToBottomThreshold] = useState<number | undefined>(1);
const shouldAutoscrollToBottomRef = useRef(true);
const previousTouchY = useRef(0);

const { showPreviousSibling, showNextSibling, getSiblingsInfo } = useManageMessageSiblings(chatId, history);
const { mutate: completeChat } = chatApi.useCompleteChat();
Expand All @@ -80,6 +81,12 @@ export default function ChatMessagesList({
isScrollToBottomAvailable.current = true;
}, 500);

if (shouldAutoscrollToBottomRef.current) {
requestAnimationFrame(() => {
listRef.current?.scrollToEnd({ animated: true });
});
}

if (!isMessagesListLoaded && listRef.current && messages?.length > 0) {
delay(() => {
listRef.current?.scrollToIndex({
Expand Down Expand Up @@ -120,6 +127,7 @@ export default function ChatMessagesList({
//NOTE: Needs to hide scroll to bottom button to avoid its jumping while scrolling to bottom
animateScrollToBottom(0);
isScrollToBottomAvailable.current = false;

delay(() => {
isScrollToBottomAvailable.current = true;
}, 1000);
Expand All @@ -128,7 +136,6 @@ export default function ChatMessagesList({
};

const handleEditPress = (index: number, messageId: string, content: string): void => {
setAutoscrollToBottomThreshold(undefined);
onEditPress(messageId, content);
delay(() => {
listRef.current?.scrollToIndex({
Expand All @@ -137,9 +144,6 @@ export default function ChatMessagesList({
animated: true,
});
}, 500);
delay(() => {
setAutoscrollToBottomThreshold(1);
}, 1000);
};

const handleContinueResponsePress = (messageId: string): void => {
Expand Down Expand Up @@ -171,6 +175,23 @@ export default function ChatMessagesList({
onFollowUpPress(text);
};

const handleTouchStart = (e: GestureResponderEvent): void => {
if (!isResponseGenerating) return;

shouldAutoscrollToBottomRef.current = false;
previousTouchY.current = e.nativeEvent.pageY;
};

const handleTouchMove = (e: GestureResponderEvent): void => {
if (!isResponseGenerating) return;

const { pageY } = e.nativeEvent;
const deltaY = pageY - previousTouchY.current;

previousTouchY.current = pageY;
shouldAutoscrollToBottomRef.current = deltaY < 0;
};

const renderItem = useCallback(
({ item, index }: { item: Message; index: number }) => {
const message = history?.messages[item.id];
Expand Down Expand Up @@ -243,14 +264,13 @@ export default function ChatMessagesList({
ItemSeparatorComponent={() => <View className='h-20' />}
data={messages}
renderItem={renderItem}
// TODO: Add autoscrollToBottom logic when it implemented in lib
maintainVisibleContentPosition={{
startRenderingFromBottom: true,
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@veliseev93 veliseev93 Feb 11, 2026

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Without this condition, the chat starts rendering from top to bottom, could you please fix it?

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@Tomass673 Tomass673 Feb 11, 2026

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Fixed

animateAutoScrollToBottom: true,
autoscrollToBottomThreshold,
}}
onContentSizeChange={handleContentSizeChange}
onScroll={handleScroll}
onTouchStart={handleTouchStart}
onTouchMove={handleTouchMove}
scrollEventThrottle={16}
/>
<ChatBottomButton isVisible={isScrollToBottomVisible} onPress={scrollToBottom} />
Expand Down
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