377 lines
11 KiB
JavaScript
377 lines
11 KiB
JavaScript
import PropTypes from 'prop-types';
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import { Children, cloneElement, PureComponent } from 'react';
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import classNames from 'classnames';
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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 IntersectionObserverArticleContainer from 'flavours/glitch/containers/intersection_observer_article_container';
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import ScrollContainer from 'flavours/glitch/containers/scroll_container';
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import IntersectionObserverWrapper from 'flavours/glitch/features/ui/util/intersection_observer_wrapper';
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import { attachFullscreenListener, detachFullscreenListener, isFullscreen } from '../features/ui/util/fullscreen';
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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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const MOUSE_IDLE_DELAY = 300;
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const listenerOptions = supportsPassiveEvents ? { passive: true } : false;
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const mapStateToProps = (state, { scrollKey }) => {
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return {
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preventScroll: scrollKey === state.getIn(['dropdown_menu', 'scroll_key']),
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};
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};
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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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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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};
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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: 300,
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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 (400 > offset && 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.updateScrollBottom(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, trackScroll, showLoading, isLoading, hasMore, numPending, prepend, alwaysPrepend, append, 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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<div className='scrollable scrollable--flex' ref={this.setRef}>
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<div role='feed' className='item-list'>
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{prepend}
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</div>
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<div className='scrollable__append'>
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<LoadingIndicator />
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</div>
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</div>
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);
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} else if (isLoading || childrenCount > 0 || hasMore || !emptyMessage) {
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scrollableArea = (
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<div className={classNames('scrollable', { fullscreen })} ref={this.setRef} onMouseMove={this.handleMouseMove}>
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<div role='feed' className='item-list'>
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{prepend}
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{loadPending}
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{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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{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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</IntersectionObserverArticleContainer>
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))}
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{loadMore}
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{!hasMore && append}
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</div>
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</div>
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);
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} else {
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scrollableArea = (
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<div className={classNames('scrollable scrollable--flex', { 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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</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}>
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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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