Commit 7e0aed39 authored by ThibG's avatar ThibG Committed by Eugen Rochko

Fix scrolling behavior (#7151)

* Update React.JS

* Use React's new lifecycles for scrollable lists

* Clean up dead code

* Make CodeClimate happy
parent 1c379b7e
......@@ -34,7 +34,7 @@ export default class ScrollableList extends PureComponent {
};
state = {
lastMouseMove: null,
fullscreen: null,
};
intersectionObserverWrapper = new IntersectionObserverWrapper();
......@@ -43,7 +43,6 @@ export default class ScrollableList extends PureComponent {
if (this.node) {
const { scrollTop, scrollHeight, clientHeight } = this.node;
const offset = scrollHeight - scrollTop - clientHeight;
this._oldScrollPosition = scrollHeight - scrollTop;
if (400 > offset && this.props.onLoadMore && !this.props.isLoading) {
this.props.onLoadMore();
......@@ -59,14 +58,6 @@ export default class ScrollableList extends PureComponent {
trailing: true,
});
handleMouseMove = throttle(() => {
this._lastMouseMove = new Date();
}, 300);
handleMouseLeave = () => {
this._lastMouseMove = null;
}
componentDidMount () {
this.attachScrollListener();
this.attachIntersectionObserver();
......@@ -76,21 +67,26 @@ export default class ScrollableList extends PureComponent {
this.handleScroll();
}
componentDidUpdate (prevProps) {
getSnapshotBeforeUpdate (prevProps) {
const someItemInserted = React.Children.count(prevProps.children) > 0 &&
React.Children.count(prevProps.children) < React.Children.count(this.props.children) &&
this.getFirstChildKey(prevProps) !== this.getFirstChildKey(this.props);
if (someItemInserted && this.node.scrollTop > 0) {
return this.node.scrollHeight - this.node.scrollTop;
} 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 (someItemInserted && this._oldScrollPosition && this.node.scrollTop > 0) {
const newScrollTop = this.node.scrollHeight - this._oldScrollPosition;
if (snapshot !== null) {
const newScrollTop = this.node.scrollHeight - snapshot;
if (this.node.scrollTop !== newScrollTop) {
this.node.scrollTop = newScrollTop;
}
} else {
this._oldScrollPosition = this.node.scrollHeight - this.node.scrollTop;
}
}
......@@ -143,10 +139,6 @@ export default class ScrollableList extends PureComponent {
this.props.onLoadMore();
}
_recentlyMoved () {
return this._lastMouseMove !== null && ((new Date()) - this._lastMouseMove < 600);
}
render () {
const { children, scrollKey, trackScroll, shouldUpdateScroll, isLoading, hasMore, prepend, emptyMessage, onLoadMore } = this.props;
const { fullscreen } = this.state;
......@@ -157,7 +149,7 @@ export default class ScrollableList extends PureComponent {
if (isLoading || childrenCount > 0 || !emptyMessage) {
scrollableArea = (
<div className={classNames('scrollable', { fullscreen })} ref={this.setRef} onMouseMove={this.handleMouseMove} onMouseLeave={this.handleMouseLeave}>
<div className={classNames('scrollable', { fullscreen })} ref={this.setRef}>
<div role='feed' className='item-list'>
{prepend}
......
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