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index.tsx
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index.tsx
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/*
* Copyright 2021 Google LLC. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
// [START maps_react_map]
import * as React from "react";
import * as ReactDom from "react-dom";
import { Wrapper, Status } from "@googlemaps/react-wrapper";
import { createCustomEqual } from "fast-equals";
import { isLatLngLiteral } from "@googlemaps/typescript-guards";
const render = (status: Status) => {
return <h1>{status}</h1>;
};
const App: React.VFC = () => {
// [START maps_react_map_component_app_state]
const [clicks, setClicks] = React.useState<google.maps.LatLng[]>([]);
const [zoom, setZoom] = React.useState(3); // initial zoom
const [center, setCenter] = React.useState<google.maps.LatLngLiteral>({
lat: 0,
lng: 0,
});
const onClick = (e: google.maps.MapMouseEvent) => {
// avoid directly mutating state
setClicks([...clicks, e.latLng!]);
};
const onIdle = (m: google.maps.Map) => {
console.log("onIdle");
setZoom(m.getZoom()!);
setCenter(m.getCenter()!.toJSON());
};
// [END maps_react_map_component_app_state]
const form = (
<div
style={{
padding: "1rem",
flexBasis: "250px",
height: "100%",
overflow: "auto",
}}
>
<label htmlFor="zoom">Zoom</label>
<input
type="number"
id="zoom"
name="zoom"
value={zoom}
onChange={(event) => setZoom(Number(event.target.value))}
/>
<br />
<label htmlFor="lat">Latitude</label>
<input
type="number"
id="lat"
name="lat"
value={center.lat}
onChange={(event) =>
setCenter({ ...center, lat: Number(event.target.value) })
}
/>
<br />
<label htmlFor="lng">Longitude</label>
<input
type="number"
id="lng"
name="lng"
value={center.lng}
onChange={(event) =>
setCenter({ ...center, lng: Number(event.target.value) })
}
/>
<h3>{clicks.length === 0 ? "Click on map to add markers" : "Clicks"}</h3>
{clicks.map((latLng, i) => (
<pre key={i}>{JSON.stringify(latLng.toJSON(), null, 2)}</pre>
))}
<button onClick={() => setClicks([])}>Clear</button>
</div>
);
// [START maps_react_map_component_app_return]
return (
<div style={{ display: "flex", height: "100%" }}>
<Wrapper apiKey={"YOUR_API_KEY"} render={render}>
<Map
center={center}
onClick={onClick}
onIdle={onIdle}
zoom={zoom}
style={{ flexGrow: "1", height: "100%" }}
>
{clicks.map((latLng, i) => (
<Marker key={i} position={latLng} />
))}
</Map>
</Wrapper>
{/* Basic form for controlling center and zoom of map. */}
{form}
</div>
);
// [END maps_react_map_component_app_return]
};
interface MapProps extends google.maps.MapOptions {
style: { [key: string]: string };
onClick?: (e: google.maps.MapMouseEvent) => void;
onIdle?: (map: google.maps.Map) => void;
}
const Map: React.FC<MapProps> = ({
onClick,
onIdle,
children,
style,
...options
}) => {
// [START maps_react_map_component_add_map_hooks]
const ref = React.useRef<HTMLDivElement>(null);
const [map, setMap] = React.useState<google.maps.Map>();
React.useEffect(() => {
if (ref.current && !map) {
setMap(new window.google.maps.Map(ref.current, {}));
}
}, [ref, map]);
// [END maps_react_map_component_add_map_hooks]
// [START maps_react_map_component_options_hook]
// because React does not do deep comparisons, a custom hook is used
// see discussion in https://github.com/googlemaps/js-samples/issues/946
useDeepCompareEffectForMaps(() => {
if (map) {
map.setOptions(options);
}
}, [map, options]);
// [END maps_react_map_component_options_hook]
// [START maps_react_map_component_event_hooks]
React.useEffect(() => {
if (map) {
["click", "idle"].forEach((eventName) =>
google.maps.event.clearListeners(map, eventName)
);
if (onClick) {
map.addListener("click", onClick);
}
if (onIdle) {
map.addListener("idle", () => onIdle(map));
}
}
}, [map, onClick, onIdle]);
// [END maps_react_map_component_event_hooks]
// [START maps_react_map_component_return]
return (
<>
<div ref={ref} style={style} />
{React.Children.map(children, (child) => {
if (React.isValidElement(child)) {
// set the map prop on the child component
return React.cloneElement(child, { map });
}
})}
</>
);
// [END maps_react_map_component_return]
};
// [START maps_react_map_marker_component]
const Marker: React.FC<google.maps.MarkerOptions> = (options) => {
const [marker, setMarker] = React.useState<google.maps.Marker>();
React.useEffect(() => {
if (!marker) {
setMarker(new google.maps.Marker());
}
// remove marker from map on unmount
return () => {
if (marker) {
marker.setMap(null);
}
};
}, [marker]);
React.useEffect(() => {
if (marker) {
marker.setOptions(options);
}
}, [marker, options]);
return null;
};
// [END maps_react_map_marker_component]
const deepCompareEqualsForMaps = createCustomEqual(
(deepEqual) => (a: any, b: any) => {
if (
isLatLngLiteral(a) ||
a instanceof google.maps.LatLng ||
isLatLngLiteral(b) ||
b instanceof google.maps.LatLng
) {
return new google.maps.LatLng(a).equals(new google.maps.LatLng(b));
}
// TODO extend to other types
// use fast-equals for other objects
return deepEqual(a, b);
}
);
function useDeepCompareMemoize(value: any) {
const ref = React.useRef();
if (!deepCompareEqualsForMaps(value, ref.current)) {
ref.current = value;
}
return ref.current;
}
function useDeepCompareEffectForMaps(
callback: React.EffectCallback,
dependencies: any[]
) {
React.useEffect(callback, dependencies.map(useDeepCompareMemoize));
}
window.addEventListener("DOMContentLoaded", () => {
ReactDom.render(<App />, document.getElementById("root"));
});
// [END maps_react_map]
let PRESERVE_COMMENT_ABOVE; // force tsc to maintain the comment above eslint-disable-line
export {};