Break ScrollableList component into parts (#38059)
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diondiondion authored and 
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@@ -0,0 +1,85 @@
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import type { ComponentPropsWithoutRef } from 'react';
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import { Children, forwardRef } from 'react';
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import classNames from 'classnames';
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import { LoadingIndicator } from '../loading_indicator';
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export const Scrollable = forwardRef<
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HTMLDivElement,
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ComponentPropsWithoutRef<'div'> & {
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flex?: boolean;
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fullscreen?: boolean;
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}
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>(({ flex = true, fullscreen, className, children, ...otherProps }, ref) => {
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return (
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<div
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className={classNames(
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'scrollable',
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{ 'scrollable--flex': flex, fullscreen },
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className,
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)}
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ref={ref}
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{...otherProps}
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>
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{children}
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</div>
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);
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});
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Scrollable.displayName = 'Scrollable';
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export const ItemList = forwardRef<
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HTMLDivElement,
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ComponentPropsWithoutRef<'div'> & {
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isLoading?: boolean;
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emptyMessage?: React.ReactNode;
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}
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>(({ isLoading, emptyMessage, className, children, ...otherProps }, ref) => {
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if (Children.count(children) === 0 && emptyMessage) {
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return <div className='empty-column-indicator'>{emptyMessage}</div>;
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}
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return (
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<>
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<div
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role='feed'
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className={classNames('item-list', className)}
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ref={ref}
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{...otherProps}
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>
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{!isLoading && children}
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</div>
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{isLoading && (
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<div className='scrollable__append'>
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<LoadingIndicator />
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</div>
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)}
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</>
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);
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});
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ItemList.displayName = 'ItemList';
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export const Article = forwardRef<
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HTMLElement,
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ComponentPropsWithoutRef<'article'> & {
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focusable?: boolean;
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'data-id'?: string;
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'aria-posinset': number;
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'aria-setsize': number;
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}
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>(({ focusable, className, children, ...otherProps }, ref) => {
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return (
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<article
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ref={ref}
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className={classNames(className, { focusable })}
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tabIndex={-1}
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{...otherProps}
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>
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{children}
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</article>
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);
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});
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Article.displayName = 'Article';
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@@ -0,0 +1,409 @@
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import PropTypes from 'prop-types';
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import { Children, cloneElement, PureComponent } from 'react';
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import { useLocation } from 'react-router-dom';
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import { List as ImmutableList } from 'immutable';
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import { connect } from 'react-redux';
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import { supportsPassiveEvents } from 'detect-passive-events';
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import { throttle } from 'lodash';
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import { ScrollContainer } from 'mastodon/containers/scroll_container';
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import IntersectionObserverArticleContainer from '../../containers/intersection_observer_article_container';
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import { attachFullscreenListener, detachFullscreenListener, isFullscreen } from '../../features/ui/util/fullscreen';
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import IntersectionObserverWrapper from '../../features/ui/util/intersection_observer_wrapper';
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import { LoadMore } from '../load_more';
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import { LoadPending } from '../load_pending';
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import { LoadingIndicator } from '../loading_indicator';
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import { Scrollable, ItemList } from './components';
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const MOUSE_IDLE_DELAY = 300;
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const listenerOptions = supportsPassiveEvents ? { passive: true } : false;
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/**
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*
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* @param {import('mastodon/store').RootState} state
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* @param {*} props
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*/
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const mapStateToProps = (state, { scrollKey }) => {
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return {
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preventScroll: scrollKey === state.dropdownMenu.scrollKey,
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};
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};
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// This component only exists to be able to call useLocation()
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const IOArticleContainerWrapper = ({id, index, listLength, intersectionObserverWrapper, trackScroll, scrollKey, children}) => {
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const location = useLocation();
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return (<IntersectionObserverArticleContainer
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id={id}
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index={index}
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listLength={listLength}
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intersectionObserverWrapper={intersectionObserverWrapper}
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saveHeightKey={trackScroll ? `${location.key}:${scrollKey}` : null}
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>
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{children}
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</IntersectionObserverArticleContainer>);
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};
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IOArticleContainerWrapper.propTypes = {
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id: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
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index: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
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listLength: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
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scrollKey: PropTypes.string.isRequired,
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intersectionObserverWrapper: PropTypes.object.isRequired,
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trackScroll: PropTypes.bool.isRequired,
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children: PropTypes.node,
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};
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class ScrollableList extends PureComponent {
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static propTypes = {
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scrollKey: PropTypes.string.isRequired,
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onLoadMore: PropTypes.func,
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onLoadPending: PropTypes.func,
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onScrollToTop: PropTypes.func,
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onScroll: PropTypes.func,
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trackScroll: PropTypes.bool,
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isLoading: PropTypes.bool,
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showLoading: PropTypes.bool,
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hasMore: PropTypes.bool,
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numPending: PropTypes.number,
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prepend: PropTypes.node,
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append: PropTypes.node,
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alwaysPrepend: PropTypes.bool,
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emptyMessage: PropTypes.node,
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children: PropTypes.node,
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bindToDocument: PropTypes.bool,
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preventScroll: PropTypes.bool,
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footer: PropTypes.node,
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className: PropTypes.string,
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};
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static defaultProps = {
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trackScroll: true,
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};
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state = {
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fullscreen: null,
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cachedMediaWidth: 250, // Default media/card width using default Mastodon theme
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};
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intersectionObserverWrapper = new IntersectionObserverWrapper();
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handleScroll = throttle(() => {
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if (this.node) {
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const scrollTop = this.getScrollTop();
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const scrollHeight = this.getScrollHeight();
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const clientHeight = this.getClientHeight();
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const offset = scrollHeight - scrollTop - clientHeight;
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if (scrollTop > 0 && offset < 400 && this.props.onLoadMore && this.props.hasMore && !this.props.isLoading) {
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this.props.onLoadMore();
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}
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if (scrollTop < 100 && this.props.onScrollToTop) {
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this.props.onScrollToTop();
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} else if (this.props.onScroll) {
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this.props.onScroll();
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}
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if (!this.lastScrollWasSynthetic) {
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// If the last scroll wasn't caused by setScrollTop(), assume it was
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// intentional and cancel any pending scroll reset on mouse idle
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this.scrollToTopOnMouseIdle = false;
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}
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this.lastScrollWasSynthetic = false;
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}
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}, 150, {
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trailing: true,
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});
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mouseIdleTimer = null;
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mouseMovedRecently = false;
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lastScrollWasSynthetic = false;
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scrollToTopOnMouseIdle = false;
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_getScrollingElement = () => {
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if (this.props.bindToDocument) {
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return (document.scrollingElement || document.body);
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} else {
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return this.node;
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}
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};
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setScrollTop = newScrollTop => {
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if (this.getScrollTop() !== newScrollTop) {
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this.lastScrollWasSynthetic = true;
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this._getScrollingElement().scrollTop = newScrollTop;
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}
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};
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clearMouseIdleTimer = () => {
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if (this.mouseIdleTimer === null) {
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return;
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}
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clearTimeout(this.mouseIdleTimer);
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this.mouseIdleTimer = null;
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};
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handleMouseMove = throttle(() => {
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// As long as the mouse keeps moving, clear and restart the idle timer.
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this.clearMouseIdleTimer();
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this.mouseIdleTimer = setTimeout(this.handleMouseIdle, MOUSE_IDLE_DELAY);
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if (!this.mouseMovedRecently && this.getScrollTop() === 0) {
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// Only set if we just started moving and are scrolled to the top.
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this.scrollToTopOnMouseIdle = true;
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}
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// Save setting this flag for last, so we can do the comparison above.
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this.mouseMovedRecently = true;
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}, MOUSE_IDLE_DELAY / 2);
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handleWheel = throttle(() => {
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this.scrollToTopOnMouseIdle = false;
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}, 150, {
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trailing: true,
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});
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handleMouseIdle = () => {
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if (this.scrollToTopOnMouseIdle && !this.props.preventScroll) {
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this.setScrollTop(0);
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}
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this.mouseMovedRecently = false;
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this.scrollToTopOnMouseIdle = false;
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};
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componentDidMount () {
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this.attachScrollListener();
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this.attachIntersectionObserver();
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attachFullscreenListener(this.onFullScreenChange);
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// Handle initial scroll position
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this.handleScroll();
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}
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getScrollPosition = () => {
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if (this.node && (this.getScrollTop() > 0 || this.mouseMovedRecently)) {
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return { height: this.getScrollHeight(), top: this.getScrollTop() };
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} else {
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return null;
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}
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};
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getScrollTop = () => {
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return this._getScrollingElement().scrollTop;
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};
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getScrollHeight = () => {
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return this._getScrollingElement().scrollHeight;
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};
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getClientHeight = () => {
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return this._getScrollingElement().clientHeight;
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};
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updateScrollBottom = (snapshot) => {
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const newScrollTop = this.getScrollHeight() - snapshot;
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this.setScrollTop(newScrollTop);
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};
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getSnapshotBeforeUpdate (prevProps) {
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const someItemInserted = Children.count(prevProps.children) > 0 &&
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Children.count(prevProps.children) < Children.count(this.props.children) &&
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this.getFirstChildKey(prevProps) !== this.getFirstChildKey(this.props);
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const pendingChanged = (prevProps.numPending > 0) !== (this.props.numPending > 0);
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if (pendingChanged || someItemInserted && (this.getScrollTop() > 0 || this.mouseMovedRecently || this.props.preventScroll)) {
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return this.getScrollHeight() - this.getScrollTop();
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} else {
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return null;
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}
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}
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componentDidUpdate (prevProps, prevState, snapshot) {
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// Reset the scroll position when a new child comes in in order not to
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// jerk the scrollbar around if you're already scrolled down the page.
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if (snapshot !== null) {
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this.setScrollTop(this.getScrollHeight() - snapshot);
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}
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}
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cacheMediaWidth = (width) => {
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if (width && this.state.cachedMediaWidth !== width) {
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this.setState({ cachedMediaWidth: width });
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}
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};
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componentWillUnmount () {
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this.clearMouseIdleTimer();
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this.detachScrollListener();
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this.detachIntersectionObserver();
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detachFullscreenListener(this.onFullScreenChange);
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}
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onFullScreenChange = () => {
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this.setState({ fullscreen: isFullscreen() });
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};
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attachIntersectionObserver () {
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let nodeOptions = {
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root: this.node,
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rootMargin: '300% 0px',
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};
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this.intersectionObserverWrapper
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.connect(this.props.bindToDocument ? {} : nodeOptions);
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}
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detachIntersectionObserver () {
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this.intersectionObserverWrapper.disconnect();
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}
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attachScrollListener () {
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if (this.props.bindToDocument) {
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document.addEventListener('scroll', this.handleScroll);
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document.addEventListener('wheel', this.handleWheel, listenerOptions);
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} else {
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this.node.addEventListener('scroll', this.handleScroll);
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this.node.addEventListener('wheel', this.handleWheel, listenerOptions);
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}
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}
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detachScrollListener () {
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if (this.props.bindToDocument) {
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document.removeEventListener('scroll', this.handleScroll);
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document.removeEventListener('wheel', this.handleWheel, listenerOptions);
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} else {
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this.node.removeEventListener('scroll', this.handleScroll);
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this.node.removeEventListener('wheel', this.handleWheel, listenerOptions);
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}
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}
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getFirstChildKey (props) {
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const { children } = props;
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let firstChild = children;
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if (children instanceof ImmutableList) {
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firstChild = children.get(0);
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} else if (Array.isArray(children)) {
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firstChild = children[0];
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}
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return firstChild && firstChild.key;
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}
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setRef = (c) => {
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this.node = c;
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};
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handleLoadMore = e => {
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e.preventDefault();
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this.props.onLoadMore();
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};
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handleLoadPending = e => {
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e.preventDefault();
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this.props.onLoadPending();
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// Prevent the weird scroll-jumping behavior, as we explicitly don't want to
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// scroll to top, and we know the scroll height is going to change
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this.scrollToTopOnMouseIdle = false;
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this.lastScrollWasSynthetic = false;
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this.clearMouseIdleTimer();
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this.mouseIdleTimer = setTimeout(this.handleMouseIdle, MOUSE_IDLE_DELAY);
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this.mouseMovedRecently = true;
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};
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render () {
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const { children, scrollKey, className, trackScroll, showLoading, isLoading, hasMore, numPending, prepend, alwaysPrepend, append, footer, emptyMessage, onLoadMore } = this.props;
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const { fullscreen } = this.state;
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const childrenCount = Children.count(children);
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const loadMore = (hasMore && onLoadMore) ? <LoadMore visible={!isLoading} onClick={this.handleLoadMore} /> : null;
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const loadPending = (numPending > 0) ? <LoadPending count={numPending} onClick={this.handleLoadPending} /> : null;
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let scrollableArea = null;
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if (showLoading) {
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scrollableArea = (
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<Scrollable ref={this.setRef}>
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{prepend}
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<ItemList isLoading />
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{footer}
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</Scrollable>
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);
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} else if (isLoading || childrenCount > 0 || numPending > 0 || hasMore || !emptyMessage) {
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scrollableArea = (
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<Scrollable fullscreen={fullscreen} ref={this.setRef} onMouseMove={this.handleMouseMove}>
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{prepend}
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<ItemList className={className}>
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{loadPending}
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{Children.map(this.props.children, (child, index) => (
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<IOArticleContainerWrapper
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key={child.key}
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id={child.key}
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index={index}
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listLength={childrenCount}
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intersectionObserverWrapper={this.intersectionObserverWrapper}
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trackScroll={trackScroll}
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scrollKey={scrollKey}
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>
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{cloneElement(child, {
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getScrollPosition: this.getScrollPosition,
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updateScrollBottom: this.updateScrollBottom,
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cachedMediaWidth: this.state.cachedMediaWidth,
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cacheMediaWidth: this.cacheMediaWidth,
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})}
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</IOArticleContainerWrapper>
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))}
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{loadMore}
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{!hasMore && append}
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</ItemList>
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{footer}
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</Scrollable>
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);
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} else {
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scrollableArea = (
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<Scrollable fullscreen={fullscreen} ref={this.setRef}>
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{alwaysPrepend && prepend}
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<div className='empty-column-indicator'>
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{emptyMessage}
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</div>
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{footer}
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</Scrollable>
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);
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}
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if (trackScroll) {
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return (
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<ScrollContainer scrollKey={scrollKey} childRef={this.setRef}>
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{scrollableArea}
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</ScrollContainer>
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);
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} else {
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return scrollableArea;
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}
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}
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}
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export default connect(mapStateToProps, null, null, { forwardRef: true })(ScrollableList);
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@@ -0,0 +1,131 @@
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import PropTypes from 'prop-types';
|
||||
import { cloneElement, Component } from 'react';
|
||||
|
||||
import getRectFromEntry from '../../features/ui/util/get_rect_from_entry';
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import scheduleIdleTask from '../../features/ui/util/schedule_idle_task';
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import { Article } from './components';
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||||
// Diff these props in the "unrendered" state
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const updateOnPropsForUnrendered = ['id', 'index', 'listLength', 'cachedHeight'];
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export default class IntersectionObserverArticle extends Component {
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static propTypes = {
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intersectionObserverWrapper: PropTypes.object.isRequired,
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id: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
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index: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
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listLength: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
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saveHeightKey: PropTypes.string,
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cachedHeight: PropTypes.number,
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onHeightChange: PropTypes.func,
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children: PropTypes.node,
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};
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state = {
|
||||
isHidden: false, // set to true in requestIdleCallback to trigger un-render
|
||||
};
|
||||
|
||||
shouldComponentUpdate (nextProps, nextState) {
|
||||
const isUnrendered = !this.state.isIntersecting && (this.state.isHidden || this.props.cachedHeight);
|
||||
const willBeUnrendered = !nextState.isIntersecting && (nextState.isHidden || nextProps.cachedHeight);
|
||||
if (!!isUnrendered !== !!willBeUnrendered) {
|
||||
// If we're going from rendered to unrendered (or vice versa) then update
|
||||
return true;
|
||||
}
|
||||
// If we are and remain hidden, diff based on props
|
||||
if (isUnrendered) {
|
||||
return !updateOnPropsForUnrendered.every(prop => nextProps[prop] === this.props[prop]);
|
||||
}
|
||||
// Else, assume the children have changed
|
||||
return true;
|
||||
}
|
||||
|
||||
componentDidMount () {
|
||||
const { intersectionObserverWrapper, id } = this.props;
|
||||
|
||||
intersectionObserverWrapper.observe(
|
||||
id,
|
||||
this.node,
|
||||
this.handleIntersection,
|
||||
);
|
||||
|
||||
this.componentMounted = true;
|
||||
}
|
||||
|
||||
componentWillUnmount () {
|
||||
const { intersectionObserverWrapper, id } = this.props;
|
||||
intersectionObserverWrapper.unobserve(id, this.node);
|
||||
|
||||
this.componentMounted = false;
|
||||
}
|
||||
|
||||
handleIntersection = (entry) => {
|
||||
this.entry = entry;
|
||||
|
||||
scheduleIdleTask(this.calculateHeight);
|
||||
this.setState(this.updateStateAfterIntersection);
|
||||
};
|
||||
|
||||
updateStateAfterIntersection = (prevState) => {
|
||||
if (prevState.isIntersecting !== false && !this.entry.isIntersecting) {
|
||||
scheduleIdleTask(this.hideIfNotIntersecting);
|
||||
}
|
||||
return {
|
||||
isIntersecting: this.entry.isIntersecting,
|
||||
isHidden: false,
|
||||
};
|
||||
};
|
||||
|
||||
calculateHeight = () => {
|
||||
const { onHeightChange, saveHeightKey, id } = this.props;
|
||||
// save the height of the fully-rendered element (this is expensive
|
||||
// on Chrome, where we need to fall back to getBoundingClientRect)
|
||||
this.height = getRectFromEntry(this.entry).height;
|
||||
|
||||
if (onHeightChange && saveHeightKey) {
|
||||
onHeightChange(saveHeightKey, id, this.height);
|
||||
}
|
||||
};
|
||||
|
||||
hideIfNotIntersecting = () => {
|
||||
if (!this.componentMounted) {
|
||||
return;
|
||||
}
|
||||
|
||||
// When the browser gets a chance, test if we're still not intersecting,
|
||||
// and if so, set our isHidden to true to trigger an unrender. The point of
|
||||
// this is to save DOM nodes and avoid using up too much memory.
|
||||
// See: https://github.com/mastodon/mastodon/issues/2900
|
||||
this.setState((prevState) => ({ isHidden: !prevState.isIntersecting }));
|
||||
};
|
||||
|
||||
handleRef = (node) => {
|
||||
this.node = node;
|
||||
};
|
||||
|
||||
render () {
|
||||
const { children, id, index, listLength, cachedHeight } = this.props;
|
||||
const { isIntersecting, isHidden } = this.state;
|
||||
|
||||
if (!isIntersecting && (isHidden || cachedHeight)) {
|
||||
return (
|
||||
<Article
|
||||
ref={this.handleRef}
|
||||
aria-posinset={index + 1}
|
||||
aria-setsize={listLength}
|
||||
style={{ height: `${this.height || cachedHeight}px`, opacity: 0, overflow: 'hidden' }}
|
||||
data-id={id}
|
||||
>
|
||||
{children && cloneElement(children, { hidden: true })}
|
||||
</Article>
|
||||
);
|
||||
}
|
||||
|
||||
return (
|
||||
<Article ref={this.handleRef} aria-posinset={index + 1} aria-setsize={listLength} data-id={id}>
|
||||
{children && cloneElement(children, { hidden: false })}
|
||||
</Article>
|
||||
);
|
||||
}
|
||||
|
||||
}
|
||||
Reference in new issue
Block a user