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fix: bound backlog lazy loading #1021

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fix: bound backlog lazy loading #1021

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74 changes: 54 additions & 20 deletions packages/webgal/src/UI/Backlog/Backlog.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -23,30 +23,53 @@ export const Backlog = () => {
const [indexHide, setIndexHide] = useState(false);
const [isDisableScroll, setIsDisableScroll] = useState(false);
const [limit, setLimit] = useState(20);
useEffect(() => {
if (!isBacklogOpen) {
const backlogContentRef = useRef<HTMLDivElement>(null);
const userRequestedMoreRef = useRef(false);
const isLoadingMoreRef = useRef(false);
const wheelGestureTimeoutRef = useRef<ReturnType<typeof setTimeout>>();
const tryLoadMore = () => {
const backlogContent = backlogContentRef.current;
const backlogLength = WebGAL.backlogManager.getBacklog().length;
if (
!isBacklogOpen ||
!backlogContent ||
!userRequestedMoreRef.current ||
isLoadingMoreRef.current ||
limit >= backlogLength
) {
return;
}
const observeTarget = backlogContent.querySelector(`#backlog_item_${limit - 5}`);
if (!observeTarget) {
return;
}
let options = {
root: null,
rootMargin: '0px',
threshold: [1.0],
};
const contentRect = backlogContent.getBoundingClientRect();
const targetRect = observeTarget.getBoundingClientRect();
const isTargetVisible = targetRect.top >= contentRect.top && targetRect.bottom <= contentRect.bottom;
if (!isTargetVisible) {
return;
}
userRequestedMoreRef.current = false;
isLoadingMoreRef.current = true;
setLimit((currentLimit) => Math.min(currentLimit + 20, backlogLength));
};

let observer = new IntersectionObserver((entries) => {
if ((entries?.[0]?.intersectionRatio ?? 0) <= 0) return;
setLimit(limit + 20);
}, options);
useEffect(() => {
isLoadingMoreRef.current = false;
}, [limit]);

const observeTarget = document.querySelector(`#backlog_item_${limit - 5}`);
if (observeTarget) {
observer.observe(observeTarget);
const handleWheel = () => {
if (!wheelGestureTimeoutRef.current) {
userRequestedMoreRef.current = true;
}

return () => {
observer.disconnect();
};
}, [limit, isBacklogOpen]);
if (wheelGestureTimeoutRef.current) {
clearTimeout(wheelGestureTimeoutRef.current);
}
wheelGestureTimeoutRef.current = setTimeout(() => {
wheelGestureTimeoutRef.current = undefined;
}, 200);
requestAnimationFrame(tryLoadMore);
};

useEffect(() => {
if (!isBacklogOpen) {
Expand Down Expand Up @@ -241,7 +264,18 @@ export const Backlog = () => {
</div>
</div>
{GUIStore.showBacklog && (
<div className={`${styles.backlog_content} ${isDisableScroll ? styles.Backlog_main_DisableScroll : ''}`}>
<div
ref={backlogContentRef}
onScroll={tryLoadMore}
onWheel={handleWheel}
onTouchStart={() => {
userRequestedMoreRef.current = true;
}}
onTouchMove={() => {
requestAnimationFrame(tryLoadMore);
}}
className={`${styles.backlog_content} ${isDisableScroll ? styles.Backlog_main_DisableScroll : ''}`}
>
{backlogList}
</div>
)}
Expand Down