diff --git a/app/javascript/flavours/glitch/components/scrollable_list.js b/app/javascript/flavours/glitch/components/scrollable_list.js index 8b1e3c93dd9..df3ace4c19a 100644 --- a/app/javascript/flavours/glitch/components/scrollable_list.js +++ b/app/javascript/flavours/glitch/components/scrollable_list.js @@ -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.onScrollToBottom && !this.props.isLoading) { this.props.onScrollToBottom(); @@ -57,14 +56,6 @@ export default class ScrollableList extends PureComponent { trailing: true, }); - handleMouseMove = throttle(() => { - this._lastMouseMove = new Date(); - }, 300); - - handleMouseLeave = () => { - this._lastMouseMove = null; - } - componentDidMount () { this.attachScrollListener(); this.attachIntersectionObserver(); @@ -74,22 +65,37 @@ export default class ScrollableList extends PureComponent { this.handleScroll(); } - componentDidUpdate (prevProps) { + getScrollPosition = () => { + if (this.node && this.node.scrollTop > 0) { + return {height: this.node.scrollHeight, top: this.node.scrollTop}; + } else { + return null; + } + } + + updateScrollBottom = (snapshot) => { + const newScrollTop = this.node.scrollHeight - snapshot; + + if (this.node.scrollTop !== newScrollTop) { + this.node.scrollTop = newScrollTop; + } + } + + getSnapshotBeforeUpdate (prevProps, prevState) { 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 (this.node.scrollTop !== newScrollTop) { - this.node.scrollTop = newScrollTop; - } - } else { - this._oldScrollPosition = this.node.scrollHeight - this.node.scrollTop; - } + if (snapshot !== null) this.updateScrollBottom(snapshot); } componentWillUnmount () { @@ -141,10 +147,6 @@ export default class ScrollableList extends PureComponent { this.props.onScrollToBottom(); } - _recentlyMoved () { - return this._lastMouseMove !== null && ((new Date()) - this._lastMouseMove < 600); - } - render () { const { children, scrollKey, trackScroll, shouldUpdateScroll, isLoading, hasMore, prepend, emptyMessage } = this.props; const { fullscreen } = this.state; @@ -155,7 +157,7 @@ export default class ScrollableList extends PureComponent { if (isLoading || childrenCount > 0 || !emptyMessage) { scrollableArea = ( -