diff options
Diffstat (limited to 'app/javascript/flavours/glitch/features/ui/components/bundle.js')
-rw-r--r-- | app/javascript/flavours/glitch/features/ui/components/bundle.js | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/app/javascript/flavours/glitch/features/ui/components/bundle.js b/app/javascript/flavours/glitch/features/ui/components/bundle.js new file mode 100644 index 000000000..fc88e0c70 --- /dev/null +++ b/app/javascript/flavours/glitch/features/ui/components/bundle.js @@ -0,0 +1,102 @@ +import React from 'react'; +import PropTypes from 'prop-types'; + +const emptyComponent = () => null; +const noop = () => { }; + +class Bundle extends React.Component { + + static propTypes = { + fetchComponent: PropTypes.func.isRequired, + loading: PropTypes.func, + error: PropTypes.func, + children: PropTypes.func.isRequired, + renderDelay: PropTypes.number, + onFetch: PropTypes.func, + onFetchSuccess: PropTypes.func, + onFetchFail: PropTypes.func, + } + + static defaultProps = { + loading: emptyComponent, + error: emptyComponent, + renderDelay: 0, + onFetch: noop, + onFetchSuccess: noop, + onFetchFail: noop, + } + + static cache = {} + + state = { + mod: undefined, + forceRender: false, + } + + componentWillMount() { + this.load(this.props); + } + + componentWillReceiveProps(nextProps) { + if (nextProps.fetchComponent !== this.props.fetchComponent) { + this.load(nextProps); + } + } + + componentWillUnmount () { + if (this.timeout) { + clearTimeout(this.timeout); + } + } + + load = (props) => { + const { fetchComponent, onFetch, onFetchSuccess, onFetchFail, renderDelay } = props || this.props; + + onFetch(); + + if (Bundle.cache[fetchComponent.name]) { + const mod = Bundle.cache[fetchComponent.name]; + + this.setState({ mod: mod.default }); + onFetchSuccess(); + return Promise.resolve(); + } + + this.setState({ mod: undefined }); + + if (renderDelay !== 0) { + this.timestamp = new Date(); + this.timeout = setTimeout(() => this.setState({ forceRender: true }), renderDelay); + } + + return fetchComponent() + .then((mod) => { + Bundle.cache[fetchComponent.name] = mod; + this.setState({ mod: mod.default }); + onFetchSuccess(); + }) + .catch((error) => { + this.setState({ mod: null }); + onFetchFail(error); + }); + } + + render() { + const { loading: Loading, error: Error, children, renderDelay } = this.props; + const { mod, forceRender } = this.state; + const elapsed = this.timestamp ? (new Date() - this.timestamp) : renderDelay; + + if (mod === undefined) { + return (elapsed >= renderDelay || forceRender) ? <Loading /> : null; + } + + if (mod === null) { + return <Error onRetry={this.load} />; + } + + return children(mod); + } + +} + +export default Bundle; |