index.community/frontend/src/components/screens/GraphScreen.tsx

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import * as React from "react";
import { connect } from "react-redux";
import { Dispatch } from "redux";
import styled from "styled-components";
import { Route, RouteComponentProps, Switch, withRouter } from "react-router";
import { InstanceScreen, SearchScreen } from ".";
import { INSTANCE_DOMAIN_PATH } from "../../constants";
import { loadInstance } from "../../redux/actions";
import { IAppState } from "../../redux/types";
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import { domainMatchSelector, isSmallScreen } from "../../util";
import { Graph, SidebarContainer } from "../organisms/";
const GraphContainer = styled.div`
display: flex;
height: 100%;
width: 100%;
`;
const FullDiv = styled.div`
position: absolute;
top: 50px;
bottom: 0;
left: 0;
right: 0;
`;
interface IGraphScreenProps extends RouteComponentProps {
currentInstanceName: string | null;
pathname: string;
graphLoadError: boolean;
loadInstance: (domain: string | null) => void;
}
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interface IGraphScreenState {
hasBeenViewed: boolean;
}
/**
* This component takes care of loading or deselecting the current instance when the URL path changes.
* It also handles changing and animating the screen shown in the sidebar.
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*
* state.hasBeenViewed is used because once the component with the graph has been mounted, we never want to unmount it.
* However, if it's not the first page viewed (e.g. if someone opens directly on /about) we don't want to render the
* graph since it slows down everything else!
*/
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class GraphScreenImpl extends React.Component<IGraphScreenProps, IGraphScreenState> {
public constructor(props: IGraphScreenProps) {
super(props);
this.state = { hasBeenViewed: false };
}
public render() {
return <Route render={this.renderRoutes} />;
}
public componentDidMount() {
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this.setHasBeenViewed();
this.loadCurrentInstance();
}
public componentDidUpdate(prevProps: IGraphScreenProps) {
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this.setHasBeenViewed();
this.loadCurrentInstance(prevProps.currentInstanceName);
}
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private setHasBeenViewed = () => {
if (this.state.hasBeenViewed) {
return;
}
const { location } = this.props;
if (location.pathname.startsWith("/instance") || location.pathname === "/") {
this.setState({ hasBeenViewed: true });
}
};
private renderRoutes = ({ location }: RouteComponentProps) => (
<FullDiv>
<GraphContainer>
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{/* Smaller screens never load the entire graph. Instead, `InstanceScreen` shows only the neighborhood. */}
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{isSmallScreen || !this.state.hasBeenViewed || <Graph />}
<SidebarContainer>
<Switch>
<Route path={INSTANCE_DOMAIN_PATH} component={InstanceScreen} />
<Route exact={true} path="/" component={SearchScreen} />
</Switch>
</SidebarContainer>
</GraphContainer>
</FullDiv>
);
private loadCurrentInstance = (prevInstanceName?: string | null) => {
if (prevInstanceName !== this.props.currentInstanceName) {
this.props.loadInstance(this.props.currentInstanceName);
}
};
}
const mapStateToProps = (state: IAppState) => {
const match = domainMatchSelector(state);
return {
currentInstanceName: match && match.params.domain,
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graphLoadError: state.data.graphLoadError,
pathname: state.router.location.pathname
};
};
const mapDispatchToProps = (dispatch: Dispatch) => ({
loadInstance: (domain: string | null) => dispatch(loadInstance(domain) as any)
});
const GraphScreen = connect(
mapStateToProps,
mapDispatchToProps
)(GraphScreenImpl);
export default withRouter(GraphScreen);