mirror of
https://github.com/lunaisnotaboy/mastodon.git
synced 2024-10-31 20:14:26 +00:00
180 lines
5.4 KiB
JavaScript
180 lines
5.4 KiB
JavaScript
|
import React, { PureComponent } from 'react';
|
||
|
import { ScrollContainer } from 'react-router-scroll';
|
||
|
import PropTypes from 'prop-types';
|
||
|
import IntersectionObserverArticle from './intersection_observer_article';
|
||
|
import LoadMore from './load_more';
|
||
|
import IntersectionObserverWrapper from '../features/ui/util/intersection_observer_wrapper';
|
||
|
import { throttle } from 'lodash';
|
||
|
|
||
|
export default class ScrollableList extends PureComponent {
|
||
|
|
||
|
static propTypes = {
|
||
|
scrollKey: PropTypes.string.isRequired,
|
||
|
onScrollToBottom: PropTypes.func,
|
||
|
onScrollToTop: PropTypes.func,
|
||
|
onScroll: PropTypes.func,
|
||
|
trackScroll: PropTypes.bool,
|
||
|
shouldUpdateScroll: PropTypes.func,
|
||
|
isLoading: PropTypes.bool,
|
||
|
hasMore: PropTypes.bool,
|
||
|
prepend: PropTypes.node,
|
||
|
emptyMessage: PropTypes.node,
|
||
|
children: PropTypes.node,
|
||
|
};
|
||
|
|
||
|
static defaultProps = {
|
||
|
trackScroll: true,
|
||
|
};
|
||
|
|
||
|
intersectionObserverWrapper = new IntersectionObserverWrapper();
|
||
|
|
||
|
handleScroll = throttle(() => {
|
||
|
if (this.node) {
|
||
|
const { scrollTop, scrollHeight, clientHeight } = this.node;
|
||
|
const offset = scrollHeight - scrollTop - clientHeight;
|
||
|
this._oldScrollPosition = scrollHeight - scrollTop;
|
||
|
|
||
|
if (400 > 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();
|
||
|
}
|
||
|
}
|
||
|
}, 150, {
|
||
|
trailing: true,
|
||
|
});
|
||
|
|
||
|
componentDidMount () {
|
||
|
this.attachScrollListener();
|
||
|
this.attachIntersectionObserver();
|
||
|
|
||
|
// Handle initial scroll posiiton
|
||
|
this.handleScroll();
|
||
|
}
|
||
|
|
||
|
componentDidUpdate (prevProps) {
|
||
|
// Reset the scroll position when a new child comes in in order not to
|
||
|
// jerk the scrollbar around if you're already scrolled down the page.
|
||
|
if (React.Children.count(prevProps.children) < React.Children.count(this.props.children) && this._oldScrollPosition && this.node.scrollTop > 0) {
|
||
|
if (this.getFirstChildKey(prevProps) !== this.getFirstChildKey(this.props)) {
|
||
|
const newScrollTop = this.node.scrollHeight - this._oldScrollPosition;
|
||
|
if (this.node.scrollTop !== newScrollTop) {
|
||
|
this.node.scrollTop = newScrollTop;
|
||
|
}
|
||
|
} else {
|
||
|
this._oldScrollPosition = this.node.scrollHeight - this.node.scrollTop;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
componentWillUnmount () {
|
||
|
this.detachScrollListener();
|
||
|
this.detachIntersectionObserver();
|
||
|
}
|
||
|
|
||
|
attachIntersectionObserver () {
|
||
|
this.intersectionObserverWrapper.connect({
|
||
|
root: this.node,
|
||
|
rootMargin: '300% 0px',
|
||
|
});
|
||
|
}
|
||
|
|
||
|
detachIntersectionObserver () {
|
||
|
this.intersectionObserverWrapper.disconnect();
|
||
|
}
|
||
|
|
||
|
attachScrollListener () {
|
||
|
this.node.addEventListener('scroll', this.handleScroll);
|
||
|
}
|
||
|
|
||
|
detachScrollListener () {
|
||
|
this.node.removeEventListener('scroll', this.handleScroll);
|
||
|
}
|
||
|
|
||
|
getFirstChildKey (props) {
|
||
|
const { children } = props;
|
||
|
const firstChild = Array.isArray(children) ? children[0] : children;
|
||
|
return firstChild && firstChild.key;
|
||
|
}
|
||
|
|
||
|
setRef = (c) => {
|
||
|
this.node = c;
|
||
|
}
|
||
|
|
||
|
handleLoadMore = (e) => {
|
||
|
e.preventDefault();
|
||
|
this.props.onScrollToBottom();
|
||
|
}
|
||
|
|
||
|
handleKeyDown = (e) => {
|
||
|
if (['PageDown', 'PageUp'].includes(e.key) || (e.ctrlKey && ['End', 'Home'].includes(e.key))) {
|
||
|
const article = (() => {
|
||
|
switch (e.key) {
|
||
|
case 'PageDown':
|
||
|
return e.target.nodeName === 'ARTICLE' && e.target.nextElementSibling;
|
||
|
case 'PageUp':
|
||
|
return e.target.nodeName === 'ARTICLE' && e.target.previousElementSibling;
|
||
|
case 'End':
|
||
|
return this.node.querySelector('[role="feed"] > article:last-of-type');
|
||
|
case 'Home':
|
||
|
return this.node.querySelector('[role="feed"] > article:first-of-type');
|
||
|
default:
|
||
|
return null;
|
||
|
}
|
||
|
})();
|
||
|
|
||
|
|
||
|
if (article) {
|
||
|
e.preventDefault();
|
||
|
article.focus();
|
||
|
article.scrollIntoView();
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
render () {
|
||
|
const { children, scrollKey, trackScroll, shouldUpdateScroll, isLoading, hasMore, prepend, emptyMessage } = this.props;
|
||
|
const childrenCount = React.Children.count(children);
|
||
|
|
||
|
const loadMore = <LoadMore visible={!isLoading && childrenCount > 0 && hasMore} onClick={this.handleLoadMore} />;
|
||
|
let scrollableArea = null;
|
||
|
|
||
|
if (isLoading || childrenCount > 0 || !emptyMessage) {
|
||
|
scrollableArea = (
|
||
|
<div className='scrollable' ref={this.setRef}>
|
||
|
<div role='feed' className='item-list' onKeyDown={this.handleKeyDown}>
|
||
|
{prepend}
|
||
|
|
||
|
{React.Children.map(this.props.children, (child, index) => (
|
||
|
<IntersectionObserverArticle key={child.key} id={child.key} index={index} listLength={childrenCount} intersectionObserverWrapper={this.intersectionObserverWrapper}>
|
||
|
{child}
|
||
|
</IntersectionObserverArticle>
|
||
|
))}
|
||
|
|
||
|
{loadMore}
|
||
|
</div>
|
||
|
</div>
|
||
|
);
|
||
|
} else {
|
||
|
scrollableArea = (
|
||
|
<div className='empty-column-indicator' ref={this.setRef}>
|
||
|
{emptyMessage}
|
||
|
</div>
|
||
|
);
|
||
|
}
|
||
|
|
||
|
if (trackScroll) {
|
||
|
return (
|
||
|
<ScrollContainer scrollKey={scrollKey} shouldUpdateScroll={shouldUpdateScroll}>
|
||
|
{scrollableArea}
|
||
|
</ScrollContainer>
|
||
|
);
|
||
|
} else {
|
||
|
return scrollableArea;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
}
|