chinwagsocial/app/javascript/mastodon/components/status_list.js

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import React from 'react';
import ImmutablePropTypes from 'react-immutable-proptypes';
import { ScrollContainer } from 'react-router-scroll';
import PropTypes from 'prop-types';
import StatusContainer from '../containers/status_container';
import LoadMore from './load_more';
import ImmutablePureComponent from 'react-immutable-pure-component';
class StatusList extends ImmutablePureComponent {
static propTypes = {
scrollKey: PropTypes.string.isRequired,
statusIds: ImmutablePropTypes.list.isRequired,
onScrollToBottom: PropTypes.func,
onScrollToTop: PropTypes.func,
onScroll: PropTypes.func,
shouldUpdateScroll: PropTypes.func,
isLoading: PropTypes.bool,
isUnread: PropTypes.bool,
hasMore: PropTypes.bool,
prepend: PropTypes.node,
emptyMessage: PropTypes.node,
};
static defaultProps = {
trackScroll: true,
};
state = {
isIntersecting: {},
intersectionCount: 0,
}
statusRefQueue = []
handleScroll = (e) => {
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const { scrollTop, scrollHeight, clientHeight } = e.target;
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const offset = scrollHeight - scrollTop - clientHeight;
this._oldScrollPosition = scrollHeight - scrollTop;
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if (250 > offset && this.props.onScrollToBottom && !this.props.isLoading) {
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this.props.onScrollToBottom();
} else if (scrollTop < 100 && this.props.onScrollToTop) {
this.props.onScrollToTop();
} else if (this.props.onScroll) {
this.props.onScroll();
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}
}
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componentDidMount () {
this.attachScrollListener();
this.attachIntersectionObserver();
}
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componentDidUpdate (prevProps) {
if ((prevProps.statusIds.size < this.props.statusIds.size && prevProps.statusIds.first() !== this.props.statusIds.first() && !!this._oldScrollPosition) && this.node.scrollTop > 0) {
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this.node.scrollTop = this.node.scrollHeight - this._oldScrollPosition;
}
}
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componentWillUnmount () {
this.detachScrollListener();
this.detachIntersectionObserver();
}
attachIntersectionObserver () {
const onIntersection = (entries) => {
this.setState(state => {
entries.forEach(entry => {
const statusId = entry.target.getAttribute('data-id');
// Edge 15 doesn't support isIntersecting, but we can infer it from intersectionRatio
// https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/12156111/
state.isIntersecting[statusId] = entry.intersectionRatio > 0;
});
// isIntersecting is a map of DOM data-id's to booleans (true for
// intersecting, false for non-intersecting).
//
// We always want to return true in shouldComponentUpdate() if
// this object changes, because onIntersection() is only called if
// something has changed.
//
// Now, we *could* use an immutable map or some other structure to
// diff the full map, but that would be pointless because the browser
// has already informed us that something has changed. So we can just
// use a regular object, which will be diffed by ImmutablePureComponent
// based on reference equality (i.e. it's always "unchanged") and
// then we just increment intersectionCount to force a change.
return {
isIntersecting: state.isIntersecting,
intersectionCount: state.intersectionCount + 1,
};
});
};
const options = {
root: this.node,
rootMargin: '300% 0px',
};
this.intersectionObserver = new IntersectionObserver(onIntersection, options);
if (this.statusRefQueue.length) {
this.statusRefQueue.forEach(node => this.intersectionObserver.observe(node));
this.statusRefQueue = [];
}
}
detachIntersectionObserver () {
this.intersectionObserver.disconnect();
}
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attachScrollListener () {
this.node.addEventListener('scroll', this.handleScroll);
}
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detachScrollListener () {
this.node.removeEventListener('scroll', this.handleScroll);
}
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setRef = (c) => {
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this.node = c;
}
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handleStatusRef = (node) => {
if (node && this.intersectionObserver) {
const statusId = node.getAttribute('data-id');
this.intersectionObserver.observe(node);
} else {
this.statusRefQueue.push(node);
}
}
handleLoadMore = (e) => {
e.preventDefault();
this.props.onScrollToBottom();
}
render () {
const { statusIds, onScrollToBottom, scrollKey, shouldUpdateScroll, isLoading, isUnread, hasMore, prepend, emptyMessage } = this.props;
const { isIntersecting } = this.state;
let loadMore = null;
let scrollableArea = null;
let unread = null;
if (!isLoading && statusIds.size > 0 && hasMore) {
loadMore = <LoadMore onClick={this.handleLoadMore} />;
}
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if (isUnread) {
unread = <div className='status-list__unread-indicator' />;
}
if (isLoading || statusIds.size > 0 || !emptyMessage) {
scrollableArea = (
<div className='scrollable' ref={this.setRef}>
{unread}
<div className='status-list'>
{prepend}
{statusIds.map((statusId) => {
return <StatusContainer key={statusId} id={statusId} isIntersecting={isIntersecting[statusId]} onRef={this.handleStatusRef} />;
})}
{loadMore}
</div>
</div>
);
} else {
scrollableArea = (
<div className='empty-column-indicator' ref={this.setRef}>
{emptyMessage}
</div>
);
}
return (
<ScrollContainer scrollKey={scrollKey} shouldUpdateScroll={shouldUpdateScroll}>
{scrollableArea}
</ScrollContainer>
);
}
}
export default StatusList;