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Fix onStartReached detection #1932

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Fix onStartReached detection #1932

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6 changes: 4 additions & 2 deletions src/recyclerview/hooks/useBoundDetection.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -104,8 +104,9 @@ export function useBoundDetection<T>(
if (onStartReached) {
const onStartReachedThreshold = onStartReachedThresholdProp ?? 0.2;
const startThresholdDistance = onStartReachedThreshold * visibleLength;
const startBaseline = Math.max(0, recyclerViewManager.firstItemOffset);

const isNearStart = lastScrollOffset <= startThresholdDistance;
const isNearStart = lastScrollOffset <= startBaseline + startThresholdDistance;

if (isNearStart && !pendingStartReached.current) {
pendingStartReached.current = true;
Expand Down Expand Up @@ -146,9 +147,10 @@ export function useBoundDetection<T>(
}
}, [requestAnimationFrame, scrollViewRef, recyclerViewManager]);

// Reset end reached state when data changes
// Reset start/end reached state when data changes
useMemo(() => {
pendingEndReached.current = false;
pendingStartReached.current = false;
// needs to run only when data changes
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [data]);
Expand Down