99 lines
2.7 KiB
JavaScript
99 lines
2.7 KiB
JavaScript
// @flow
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import * as React from 'react';
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import { observable, action } from 'mobx';
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import { observer } from 'mobx-react';
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import { Waypoint } from 'react-waypoint';
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import { DEFAULT_PAGINATION_LIMIT } from 'stores/BaseStore';
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import Document from 'models/Document';
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import DocumentList from 'components/DocumentList';
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import { ListPlaceholder } from 'components/LoadingPlaceholder';
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type Props = {
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documents: Document[],
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fetch: (options: ?Object) => Promise<void>,
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options?: Object,
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heading?: React.Node,
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empty?: React.Node,
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};
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@observer
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class PaginatedDocumentList extends React.Component<Props> {
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isInitiallyLoaded: boolean = false;
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@observable isLoaded: boolean = false;
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@observable isFetchingMore: boolean = false;
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@observable isFetching: boolean = false;
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@observable offset: number = 0;
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@observable allowLoadMore: boolean = true;
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componentDidMount() {
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this.isInitiallyLoaded = !!this.props.documents.length;
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this.fetchResults();
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}
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componentDidUpdate(prevProps: Props) {
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if (prevProps.fetch !== this.props.fetch) {
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this.fetchResults();
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}
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}
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fetchResults = async () => {
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this.isFetching = true;
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const limit = DEFAULT_PAGINATION_LIMIT;
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const results = await this.props.fetch({
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limit,
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offset: this.offset,
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...this.props.options,
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});
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if (
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results &&
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(results.length === 0 || results.length < DEFAULT_PAGINATION_LIMIT)
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) {
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this.allowLoadMore = false;
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} else {
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this.offset += DEFAULT_PAGINATION_LIMIT;
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}
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this.isLoaded = true;
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this.isFetching = false;
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this.isFetchingMore = false;
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};
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@action
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loadMoreResults = async () => {
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// Don't paginate if there aren't more results or we’re in the middle of fetching
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if (!this.allowLoadMore || this.isFetching) return;
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this.isFetchingMore = true;
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await this.fetchResults();
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};
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render() {
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const { empty, heading, documents, fetch, options, ...rest } = this.props;
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const showLoading =
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this.isFetching && !this.isFetchingMore && !this.isInitiallyLoaded;
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const showEmpty = !documents.length && !showLoading;
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const showList =
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(this.isLoaded || this.isInitiallyLoaded) && !showLoading && !showEmpty;
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return (
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<React.Fragment>
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{showEmpty && empty}
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{showList && (
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<React.Fragment>
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{heading}
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<DocumentList documents={documents} {...rest} />
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{this.allowLoadMore && (
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<Waypoint key={this.offset} onEnter={this.loadMoreResults} />
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)}
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</React.Fragment>
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)}
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{showLoading && <ListPlaceholder count={5} />}
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</React.Fragment>
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);
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}
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}
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export default PaginatedDocumentList;
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