forked from treehouse/mastodon
103 lines
2.3 KiB
JavaScript
103 lines
2.3 KiB
JavaScript
import React from 'react';
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import PropTypes from 'prop-types';
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const emptyComponent = () => null;
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const noop = () => { };
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class Bundle extends React.Component {
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static propTypes = {
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fetchComponent: PropTypes.func.isRequired,
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loading: PropTypes.func,
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error: PropTypes.func,
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children: PropTypes.func.isRequired,
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renderDelay: PropTypes.number,
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onFetch: PropTypes.func,
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onFetchSuccess: PropTypes.func,
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onFetchFail: PropTypes.func,
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}
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static defaultProps = {
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loading: emptyComponent,
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error: emptyComponent,
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renderDelay: 0,
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onFetch: noop,
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onFetchSuccess: noop,
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onFetchFail: noop,
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}
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static cache = {}
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state = {
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mod: undefined,
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forceRender: false,
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}
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componentWillMount() {
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this.load(this.props);
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}
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componentWillReceiveProps(nextProps) {
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if (nextProps.fetchComponent !== this.props.fetchComponent) {
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this.load(nextProps);
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}
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}
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componentWillUnmount () {
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if (this.timeout) {
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clearTimeout(this.timeout);
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}
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}
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load = (props) => {
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const { fetchComponent, onFetch, onFetchSuccess, onFetchFail, renderDelay } = props || this.props;
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onFetch();
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if (Bundle.cache[fetchComponent.name]) {
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const mod = Bundle.cache[fetchComponent.name];
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this.setState({ mod: mod.default });
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onFetchSuccess();
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return Promise.resolve();
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}
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this.setState({ mod: undefined });
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if (renderDelay !== 0) {
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this.timestamp = new Date();
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this.timeout = setTimeout(() => this.setState({ forceRender: true }), renderDelay);
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}
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return fetchComponent()
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.then((mod) => {
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Bundle.cache[fetchComponent.name] = mod;
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this.setState({ mod: mod.default });
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onFetchSuccess();
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})
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.catch((error) => {
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this.setState({ mod: null });
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onFetchFail(error);
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});
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}
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render() {
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const { loading: Loading, error: Error, children, renderDelay } = this.props;
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const { mod, forceRender } = this.state;
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const elapsed = this.timestamp ? (new Date() - this.timestamp) : renderDelay;
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if (mod === undefined) {
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return (elapsed >= renderDelay || forceRender) ? <Loading /> : null;
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}
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if (mod === null) {
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return <Error onRetry={this.load} />;
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}
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return children(mod);
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}
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}
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export default Bundle;
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