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Message List: Fix FAB flickering with tall incoming message

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This commit is contained in:
Alexander Zinchuk 2021-04-13 21:47:38 +03:00
parent b95e39709a
commit 0e03527b7a
1 changed files with 40 additions and 11 deletions
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51
src/components/middle/MessageScroll.tsx
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@ -25,7 +25,11 @@ type OwnProps = {
children: any;
};
const FAB_THRESHOLD = 100;
const FAB_THRESHOLD = 50;
const FAB_FREEZE_TIMEOUT = 100;
// Local flag is used because `freeze/unfreeze` methods are controlled by heavy animation
let isFabFrozen = false;
const MessageScroll: FC<OwnProps> = ({
containerRef,
@ -51,6 +55,10 @@ const MessageScroll: FC<OwnProps> = ({
const fabTriggerRef = useRef<HTMLDivElement>(null);
const updateFabVisibility = useCallback(() => {
if (isFabFrozen) {
return;
}
if (!messageIds || !messageIds.length) {
onFabToggle(false);
return;
@ -69,7 +77,11 @@ const MessageScroll: FC<OwnProps> = ({
onFabToggle(firstUnreadId ? !isAtBottom : !isNearBottom);
}, [messageIds, isViewportNewest, containerRef, onFabToggle, firstUnreadId]);
const { observe: observeIntersection, freeze, unfreeze } = useIntersectionObserver({
const {
observe: observeIntersection,
freeze: freezeForLoadMore,
unfreeze: unfreezeForLoadMore,
} = useIntersectionObserver({
rootRef: containerRef,
margin: MESSAGE_LIST_SENSITIVE_AREA,
}, (entries) => {
@ -93,18 +105,14 @@ const MessageScroll: FC<OwnProps> = ({
}
});
useOnChange(() => {
if (focusingId) {
freeze();
} else {
unfreeze();
}
}, [focusingId]);
useOnIntersect(backwardsTriggerRef, observeIntersection);
useOnIntersect(forwardsTriggerRef, observeIntersection);
const { observe: observeIntersectionForFab } = useIntersectionObserver({
const {
observe: observeIntersectionForFab,
freeze: freezeForFab,
unfreeze: unfreezeForFab,
} = useIntersectionObserver({
rootRef: containerRef,
margin: FAB_THRESHOLD,
}, ([{ target }]) => {
@ -115,6 +123,17 @@ const MessageScroll: FC<OwnProps> = ({
useOnIntersect(fabTriggerRef, observeIntersectionForFab);
// Do not load more and show FAB when focusing
useOnChange(() => {
if (focusingId) {
freezeForLoadMore();
freezeForFab();
} else {
unfreezeForFab();
unfreezeForLoadMore();
}
}, [focusingId]);
// Remember scroll position before updating height
useOnChange(() => {
if (!listItemElementsRef.current) {
@ -135,6 +154,16 @@ const MessageScroll: FC<OwnProps> = ({
anchorTopRef.current = anchor.getBoundingClientRect().top;
}, [messageIds, containerHeight]);
// Workaround for FAB flickering with tall incoming message
useOnChange(() => {
isFabFrozen = true;
setTimeout(() => {
isFabFrozen = false;
}, FAB_FREEZE_TIMEOUT);
}, [messageIds]);
// Workaround for stuck FAB when many unread messages
useEffect(updateFabVisibility, [firstUnreadId]);
return (