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Change scroll behavior

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Rafael 2022-02-08 10:12:03 -03:00 committed by Thomas Zarebczan
parent b5c7f9cd8a
commit e42090d3b6
1 changed files with 16 additions and 39 deletions
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55
ui/component/livestreamChatLayout/view.jsx
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@ -73,7 +73,6 @@ export default function LivestreamChatLayout(props: Props) {
const discussionElement = isMobile ? mobileElement : webElement;
const allCommentsElem = document.querySelectorAll('.livestream__comment');
const lastCommentElem = allCommentsElem && allCommentsElem[allCommentsElem.length - 1];
const secondLastCommentElem = allCommentsElem && allCommentsElem[allCommentsElem.length - 2];
const [viewMode, setViewMode] = React.useState(VIEW_MODES.CHAT);
const [scrollPos, setScrollPos] = React.useState(0);
@ -82,7 +81,6 @@ export default function LivestreamChatLayout(props: Props) {
const [openedPopoutWindow, setPopoutWindow] = React.useState(undefined);
const [chatHidden, setChatHidden] = React.useState(false);
const [didInitialScroll, setDidInitialScroll] = React.useState(false);
const [bottomScrollTop, setBottomScrollTop] = React.useState(0);
const [minScrollHeight, setMinScrollHeight] = React.useState(0);
const claimId = claim && claim.claim_id;
@ -90,7 +88,7 @@ export default function LivestreamChatLayout(props: Props) {
const commentsLength = commentsToDisplay && commentsToDisplay.length;
const pinnedComment = pinnedComments.length > 0 ? pinnedComments[0] : null;
const { superChatsChannelUrls, superChatsFiatAmount, superChatsLBCAmount } = getTipValues(superChatsByAmount);
const hasRecentComments = Boolean(
const scrolledPastRecent = Boolean(
(scrollPos || scrollPos === 0) &&
(!isMobile || minScrollHeight) &&
scrollPos < minScrollHeight &&
@ -100,9 +98,16 @@ export default function LivestreamChatLayout(props: Props) {
const restoreScrollPos = React.useCallback(() => {
if (discussionElement) {
discussionElement.scrollTop = !isMobile ? 0 : discussionElement.scrollHeight;
setBottomScrollTop(discussionElement.scrollTop);
if (isMobile) {
const pos = lastCommentElem && discussionElement.scrollTop - lastCommentElem.getBoundingClientRect().height;
if (!minScrollHeight || minScrollHeight !== pos) {
setMinScrollHeight(pos);
}
}
}
}, [discussionElement, isMobile]);
}, [discussionElement, isMobile, lastCommentElem, minScrollHeight]);
const commentsRef = React.createRef();
@ -132,18 +137,11 @@ export default function LivestreamChatLayout(props: Props) {
}, [claimId, uri, doCommentList, doSuperChatList]);
React.useEffect(() => {
if (
isMobile &&
discussionElement &&
viewMode === VIEW_MODES.CHAT &&
(!didInitialScroll || bottomScrollTop === 0) &&
discussionElement.scrollTop < discussionElement.scrollHeight
) {
discussionElement.scrollTop = discussionElement.scrollHeight;
if (isMobile && viewMode === VIEW_MODES.CHAT && !didInitialScroll) {
restoreScrollPos();
setDidInitialScroll(true);
setBottomScrollTop(discussionElement.scrollTop);
}
}, [bottomScrollTop, didInitialScroll, discussionElement, isMobile, viewMode]);
}, [didInitialScroll, isMobile, restoreScrollPos, viewMode]);
// Register scroll handler (TODO: Should throttle/debounce)
React.useEffect(() => {
@ -154,19 +152,6 @@ export default function LivestreamChatLayout(props: Props) {
if (!scrollPos || scrollTop !== scrollPos) {
setScrollPos(scrollTop);
}
if (isMobile) {
const pos =
lastCommentElem &&
secondLastCommentElem &&
bottomScrollTop -
lastCommentElem.getBoundingClientRect().height -
secondLastCommentElem.getBoundingClientRect().height;
if (!minScrollHeight || minScrollHeight !== pos) {
setMinScrollHeight(pos);
}
}
}
}
@ -174,15 +159,7 @@ export default function LivestreamChatLayout(props: Props) {
discussionElement.addEventListener('scroll', handleScroll);
return () => discussionElement.removeEventListener('scroll', handleScroll);
}
}, [
bottomScrollTop,
discussionElement,
isMobile,
lastCommentElem,
secondLastCommentElem,
minScrollHeight,
scrollPos,
]);
}, [discussionElement, scrollPos]);
// Retain scrollPos=0 when receiving new messages.
React.useEffect(() => {
@ -367,11 +344,11 @@ export default function LivestreamChatLayout(props: Props) {
uri={uri}
commentsToDisplay={commentsToDisplay}
isMobile={isMobile}
restoreScrollPos={!hasRecentComments && isMobile && restoreScrollPos}
restoreScrollPos={!scrolledPastRecent && isMobile && restoreScrollPos}
/>
)}
{hasRecentComments ? (
{scrolledPastRecent ? (
<Button
button="secondary"
className="livestream-comments__scroll-to-recent"