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import React from 'react';
import Status from './status';
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 {
constructor (props, context) {
super(props, context);
this.handleScroll = this.handleScroll.bind(this);
this.setRef = this.setRef.bind(this);
this.handleLoadMore = this.handleLoadMore.bind(this);
}
handleScroll (e) {
const { scrollTop, scrollHeight, clientHeight } = e.target;
const offset = scrollHeight - scrollTop - clientHeight;
this._oldScrollPosition = scrollHeight - scrollTop;
if (250 > offset && this.props.onScrollToBottom && !this.props.isLoading) {
this.props.onScrollToBottom();
} else if (scrollTop < 100 && this.props.onScrollToTop) {
this.props.onScrollToTop();
} else if (this.props.onScroll) {
this.props.onScroll();
}
}
componentDidMount () {
this.attachScrollListener();
}
componentDidUpdate (prevProps) {
if (this.node.scrollTop > 0 && (prevProps.statusIds.size < this.props.statusIds.size && prevProps.statusIds.first() !== this.props.statusIds.first() && !!this._oldScrollPosition)) {
this.node.scrollTop = this.node.scrollHeight - this._oldScrollPosition;
}
}
componentWillUnmount () {
this.detachScrollListener();
}
attachScrollListener () {
this.node.addEventListener('scroll', this.handleScroll);
}
detachScrollListener () {
this.node.removeEventListener('scroll', this.handleScroll);
}
setRef (c) {
this.node = c;
}
handleLoadMore (e) {
e.preventDefault();
this.props.onScrollToBottom();
}
render () {
const { statusIds, onScrollToBottom, scrollKey, shouldUpdateScroll, isLoading, isUnread, hasMore, prepend, emptyMessage } = this.props;
let loadMore = '';
let scrollableArea = '';
let unread = '';
if (!isLoading && statusIds.size > 0 && hasMore) {
loadMore = <LoadMore onClick={this.handleLoadMore} />;
}
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} />;
})}
{loadMore}
</div>
</div>
);
} else {
scrollableArea = (
<div className='empty-column-indicator' ref={this.setRef}>
{emptyMessage}
</div>
);
}
return (
<ScrollContainer scrollKey={scrollKey} shouldUpdateScroll={shouldUpdateScroll}>
{scrollableArea}
</ScrollContainer>
);
}
}
StatusList.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
};
StatusList.defaultProps = {
trackScroll: true
};
export default StatusList;
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