demarches-normaliennes/app/javascript/components/shared/maplibre/MapLibre.tsx

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import React, {
useState,
useContext,
useRef,
useEffect,
useMemo,
ReactNode,
createContext,
useCallback
} from 'react';
import maplibre, { Map, Style, NavigationControl } from 'maplibre-gl';
import invariant from 'tiny-invariant';
import { useStyle } from './hooks';
import { StyleControl } from './StyleControl';
const Context = createContext<{ map?: Map | null }>({});
type MapLibreProps = {
layers: string[];
children: ReactNode;
};
export function useMapLibre() {
const context = useContext(Context);
invariant(context.map, 'Maplibre not initialized');
return context.map;
}
export function MapLibre({ children, layers }: MapLibreProps) {
const isSupported = useMemo(
() => maplibre.supported({ failIfMajorPerformanceCaveat: true }) && !isIE(),
[]
);
const containerRef = useRef<HTMLDivElement>(null);
const [map, setMap] = useState<Map | null>();
const onStyleChange = useCallback(
(style: Style) => {
if (map) {
map.setStyle(style);
}
},
[map]
);
const { style, ...mapStyleProps } = useStyle(layers, onStyleChange);
useEffect(() => {
if (isSupported && !map) {
invariant(containerRef.current, 'Map container not found');
const map = new Map({
container: containerRef.current,
style
});
map.addControl(new NavigationControl({}), 'top-right');
map.on('load', () => {
setMap(map);
});
}
}, [map, style, isSupported]);
if (!isSupported) {
return (
<div
style={{ marginBottom: '20px' }}
className="outdated-browser-banner site-banner"
>
<div className="container">
<div className="site-banner-icon"></div>
<div className="site-banner-text">
Nous ne pouvons pas afficher la carte car elle est imcompatible avec
votre navigateur. Nous vous conseillons de le mettre à jour ou
dutiliser{' '}
<a
href="https://browser-update.org/fr/update.html"
target="_blank"
rel="noopener noreferrer"
>
un navigateur plus récent
</a>
.
</div>
</div>
</div>
);
}
return (
<Context.Provider value={{ map }}>
<div ref={containerRef} style={{ height: '500px' }}>
<StyleControl styleId={style.id} {...mapStyleProps} />
{map ? children : null}
</div>
</Context.Provider>
);
}
function isIE() {
const ua = window.navigator.userAgent;
const msie = ua.indexOf('MSIE ');
const trident = ua.indexOf('Trident/');
return msie > 0 || trident > 0;
}