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fix: take into account when the document body is scrolled

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This commit is contained in:
Your Autistic Life 2023-08-08 16:59:32 -04:00
parent b94c403ecf
commit a352821495
1 changed files with 25 additions and 29 deletions
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48
app/javascript/mastodon/components/scrollable_list.jsx
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@ -88,6 +88,7 @@ class ScrollableList extends PureComponent {
intersectionObserverWrapper = new IntersectionObserverWrapper();
firstSeenArticle = null;
scrollAdjustment = 0;
handleScroll = throttle(() => {
if (this.node) {
@ -132,6 +133,12 @@ class ScrollableList extends PureComponent {
// Handle initial scroll position
this.handleScroll();
// If we are bound to the document, the stuff above the scrollable has to
// be taken into account when we focus back to the article we want.
if (this.props.bindToDocument) {
this.scrollAdjustment = this.node.getBoundingClientRect().top;
}
}
getScrollPosition = () => {
@ -160,27 +167,6 @@ class ScrollableList extends PureComponent {
this.setScrollTop(newScrollTop);
};
getSnapshotBeforeUpdate (prevProps) {
const someItemInserted = Children.count(prevProps.children) > 0 &&
Children.count(prevProps.children) < Children.count(this.props.children) &&
this.getFirstChildKey(prevProps) !== this.getFirstChildKey(this.props);
const pendingChanged = (prevProps.numPending > 0) !== (this.props.numPending > 0);
if (pendingChanged || someItemInserted && (this.getScrollTop() > 0 || this.props.preventScroll)) {
return this.getScrollHeight() - this.getScrollTop();
} else {
return null;
}
}
componentDidUpdate (prevProps, prevState, snapshot) {
// Reset the scroll position when a new child comes in in order not to
// jerk the scrollbar around if you're already scrolled down the page.
if (snapshot !== null) {
this.setScrollTop(this.getScrollHeight() - snapshot);
}
}
cacheMediaWidth = (width) => {
if (width && this.state.cachedMediaWidth !== width) {
this.setState({ cachedMediaWidth: width });
@ -248,11 +234,14 @@ class ScrollableList extends PureComponent {
preLoad = () => {
// Here we record the first visible article so that when we mouseUp on
// the LoadX element, were able to scroll back to it.
// Note that it does not matter whether we are binding to the document, or
// not. The node we have to test is always that of the scrollable itself.
const scrollableRect = this.node.getBoundingClientRect();
const articles = this.node.querySelectorAll("article");
for (const article of articles) {
const articleRect = article.getBoundingClientRect();
if (articleRect.top > scrollableRect.top) {
if (articleRect.top >= scrollableRect.top) {
this.firstSeenArticle = article;
break;
}
@ -260,15 +249,22 @@ class ScrollableList extends PureComponent {
}
returnToFirstArticle () {
if (this.firstSeenArticle !== null) {
const first = this.firstSeenArticle;
if (first === null) {
return;
}
// Scroll the firstSeenArticle back into view once we're done with
// everything else.
setTimeout(() => {
firstSeenArticle.scrollIntoView();
firstSeenArticle.querySelector("div.status__wrapper").focus();
// We need to adjust with the scrollAdjustment. It is non-zero only when
// we bind to the document.
this.setScrollTop(this.getScrollTop() +
first.getBoundingClientRect().top -
this.scrollAdjustment);
first.querySelector("div.status__wrapper").focus();
}, 0);
}
}
handleLoadMore = e => {