dce7eb575b
• Updated: - scrollable list offset to 1500 for inifinite load from 600 offset
275 lines
7.9 KiB
JavaScript
275 lines
7.9 KiB
JavaScript
import throttle from 'lodash.throttle'
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import { List as ImmutableList } from 'immutable'
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import { BREAKPOINT_EXTRA_SMALL } from '../constants'
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import IntersectionObserverArticle from './intersection_observer_article'
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import IntersectionObserverWrapper from '../features/ui/util/intersection_observer_wrapper'
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import Responsive from '../features/ui/util/responsive_component'
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import Block from './block'
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import Icon from './icon'
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import ColumnIndicator from './column_indicator'
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import LoadMore from './load_more'
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const MOUSE_IDLE_DELAY = 300
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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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onReload: PropTypes.func,
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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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emptyMessage: PropTypes.oneOfType([
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PropTypes.string,
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PropTypes.object,
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]),
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children: PropTypes.node,
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onScrollToTop: PropTypes.func,
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onScroll: PropTypes.func,
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}
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state = {
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cachedMediaWidth: 250, // Default media/card width using default Gab Social theme
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}
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intersectionObserverWrapper = new IntersectionObserverWrapper();
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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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setScrollTop = newScrollTop => {
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if (this.documentElement.scrollTop !== newScrollTop) {
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this.lastScrollWasSynthetic = true;
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this.documentElement.scrollTop = newScrollTop;
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}
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};
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clearMouseIdleTimer = () => {
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if (this.mouseIdleTimer === null) return;
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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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// Only set if we just started moving and are scrolled to the top.
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if (!this.mouseMovedRecently && this.documentElement.scrollTop === 0) {
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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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handleMouseIdle = () => {
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if (this.scrollToTopOnMouseIdle) {
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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.window = window;
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this.documentElement = document.scrollingElement || document.documentElement;
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this.attachScrollListener();
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this.attachIntersectionObserver();
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// Handle initial scroll posiiton
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this.handleScroll();
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}
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getScrollPosition = () => {
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if (this.documentElement && (this.documentElement.scrollTop > 0 || this.mouseMovedRecently)) {
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return { height: this.documentElement.scrollHeight, top: this.documentElement.scrollTop };
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}
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return null;
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}
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updateScrollBottom = (snapshot) => {
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const newScrollTop = this.documentElement.scrollHeight - snapshot;
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this.setScrollTop(newScrollTop);
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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.documentElement.scrollHeight - snapshot);
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}
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}
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attachScrollListener() {
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this.window.addEventListener('scroll', this.handleScroll);
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this.window.addEventListener('wheel', this.handleWheel);
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}
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detachScrollListener() {
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this.window.removeEventListener('scroll', this.handleScroll);
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this.window.removeEventListener('wheel', this.handleWheel);
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}
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handleScroll = throttle(() => {
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if (this.window) {
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const { scrollTop, scrollHeight } = this.documentElement;
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const { innerHeight } = this.window;
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const offset = scrollHeight - scrollTop - innerHeight;
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if (scrollTop < -60 && this.props.onReload) {
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// reload
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}
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if (1500 > 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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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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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.documentElement.scrollTop > 0 || this.mouseMovedRecently)) {
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return this.documentElement.scrollHeight - this.documentElement.scrollTop;
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}
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return null;
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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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}
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attachIntersectionObserver() {
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this.intersectionObserverWrapper.connect();
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}
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detachIntersectionObserver() {
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this.intersectionObserverWrapper.disconnect();
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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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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 {
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children,
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scrollKey,
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showLoading,
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isLoading,
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hasMore,
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emptyMessage,
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onLoadMore,
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} = this.props
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const childrenCount = React.Children.count(children);
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const loadMore = (hasMore && onLoadMore) ? <LoadMore visible={!isLoading} onClick={this.handleLoadMore} /> : null
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if (showLoading) {
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return <ColumnIndicator type='loading' />
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} else if (isLoading || childrenCount > 0 || hasMore || !emptyMessage) {
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return (
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<div onMouseMove={this.handleMouseMove}>
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<div role='feed'>
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{
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!!this.props.children &&
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React.Children.map(this.props.children, (child, index) => (
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<IntersectionObserverArticle
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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={`${this.context.router.route.location.key}:${scrollKey}`}
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>
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{
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React.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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}
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</IntersectionObserverArticle>
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))
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}
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{loadMore}
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{
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isLoading &&
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<ColumnIndicator type='loading' />
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}
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</div>
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</div>
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);
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}
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return (
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<Block>
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<ColumnIndicator type='error' message={emptyMessage} />
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</Block>
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)
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}
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}
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