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200 lines
5.9 KiB
200 lines
5.9 KiB
import React, { PureComponent } from 'react';
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import { ScrollContainer } from 'react-router-scroll-4';
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import PropTypes from 'prop-types';
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import IntersectionObserverArticleContainer from '../containers/intersection_observer_article_container';
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import LoadMore from './load_more';
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import IntersectionObserverWrapper from '../features/ui/util/intersection_observer_wrapper';
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import { throttle } from 'lodash';
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import { List as ImmutableList } from 'immutable';
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import classNames from 'classnames';
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import { attachFullscreenListener, detachFullscreenListener, isFullscreen } from '../features/ui/util/fullscreen';
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export default class ScrollableList extends PureComponent {
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static contextTypes = {
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router: PropTypes.object,
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};
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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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onScrollToTop: PropTypes.func,
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onScroll: PropTypes.func,
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trackScroll: PropTypes.bool,
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shouldUpdateScroll: PropTypes.func,
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isLoading: PropTypes.bool,
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hasMore: PropTypes.bool,
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prepend: PropTypes.node,
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alwaysPrepend: PropTypes.bool,
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alwaysShowScrollbar: PropTypes.bool,
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emptyMessage: PropTypes.node,
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children: PropTypes.node,
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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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};
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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, scrollHeight, clientHeight } = this.node;
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const offset = scrollHeight - scrollTop - clientHeight;
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if (400 > offset && this.props.onLoadMore && !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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}
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}, 150, {
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trailing: true,
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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 posiiton
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this.handleScroll();
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}
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getSnapshotBeforeUpdate (prevProps) {
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const someItemInserted = React.Children.count(prevProps.children) > 0 &&
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React.Children.count(prevProps.children) < React.Children.count(this.props.children) &&
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this.getFirstChildKey(prevProps) !== this.getFirstChildKey(this.props);
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if (someItemInserted && this.node.scrollTop > 0) {
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return this.node.scrollHeight - this.node.scrollTop;
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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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const newScrollTop = this.node.scrollHeight - snapshot;
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if (this.node.scrollTop !== newScrollTop) {
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this.node.scrollTop = newScrollTop;
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}
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}
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}
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componentWillUnmount () {
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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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this.intersectionObserverWrapper.connect({
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root: this.node,
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rootMargin: '300% 0px',
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});
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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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this.node.addEventListener('scroll', this.handleScroll);
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}
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detachScrollListener () {
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this.node.removeEventListener('scroll', this.handleScroll);
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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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render () {
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const { children, scrollKey, trackScroll, shouldUpdateScroll, isLoading, hasMore, prepend, alwaysPrepend, alwaysShowScrollbar, emptyMessage, onLoadMore } = this.props;
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const { fullscreen } = this.state;
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const childrenCount = React.Children.count(children);
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const loadMore = (hasMore && childrenCount > 0 && onLoadMore) ? <LoadMore visible={!isLoading} onClick={this.handleLoadMore} /> : null;
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let scrollableArea = null;
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if (isLoading || childrenCount > 0 || !emptyMessage) {
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scrollableArea = (
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<div className={classNames('scrollable', { fullscreen })} ref={this.setRef}>
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<div role='feed' className='item-list'>
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{prepend}
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{React.Children.map(this.props.children, (child, index) => (
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<IntersectionObserverArticleContainer
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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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saveHeightKey={trackScroll ? `${this.context.router.route.location.key}:${scrollKey}` : null}
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>
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{child}
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</IntersectionObserverArticleContainer>
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))}
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{loadMore}
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</div>
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</div>
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);
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} else {
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const scrollable = alwaysShowScrollbar;
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scrollableArea = (
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<div className={classNames({ scrollable, fullscreen })} ref={this.setRef} style={{ flex: '1 1 auto', display: 'flex', flexDirection: 'column' }}>
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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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</div>
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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} shouldUpdateScroll={shouldUpdateScroll}>
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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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