当位置改变时重新定位地图的中心？

Question

大家好，我正在使用react-google-maps图书馆。每次我的位置发生变化时，我都试图重新调整我的地图（缩放标记所在的位置），但我对如何实现整个事情有点迷茫。我可以看到标记正在更新，但地图保持在其defaultCenter位置。

import React, { Component } from 'react';
import PropTypes from 'prop-types';
import {
  GoogleMap,
  Marker,
  withScriptjs,
  withGoogleMap
} from 'react-google-maps';

import environment from '../../config/environment';

class Map extends Component {
  static propTypes = {
    defaultZoom: PropTypes.number,
    center: PropTypes.shape({
      lat: PropTypes.number,
      lng: PropTypes.number
    }),
    location: PropTypes.shape({
      lat: PropTypes.number,
      lng: PropTypes.number
    }),
    onPositionChanged: PropTypes.func
  };

  static defaultProps = {
    defaultZoom: 14,
    center: {
      lat: 60.1699,
      lng: 24.9384
    },
    location: {},
    onPositionChanged: () => {}
  };

  constructor(props) {
    super(props);
    this.mapRef = React.createRef((ref) => {
      this.mapRef = ref;
    });
  }

  componenDidUpdate() {
    console.log(`I'm about to update with props: ${JSON.strongify(prevProps, undefined, 2)}`);
  }

  onPositionChanged = (location) => {
    console.log(`This the new location onPositionChange:${JSON.stringify(location, undefined, 2)}`);
    const newLocation = new window.google.maps.LatLng(location.lat, location.lng);
    // [NOTE]: try using the panTo() from googleMaps to recenter the map ? but don't know how to call it.

    return (
      <Marker
        position={newLocation}
      />
    );
  }

  render() {
    const {
      center,
      defaultZoom,
      location,
      onPositionChanged
    } = this.props;

    return (

      <GoogleMap
        className="google-map"
        onClick={onPositionChanged(location)}
        defaultZoom={defaultZoom}
        defaultCenter={center}
        ref={this.mapRef}
      >

        {/* <Marker
          position={location}
        /> */}

        { this.onPositionChanged(location) }
      </GoogleMap>
    );
  }
}

const SchedulerGoogleMap = withScriptjs(withGoogleMap(Map));
const SchedulerMap = props => (
  <SchedulerGoogleMap
    googleMapURL={`https://maps.googleapis.com/maps/api/js?key=${
      environment.GOOGLE_MAPS_API_KEY
    }&v=3`}
    loadingElement={<div style={{ height: '20vh' }} />}
    containerElement={<div style={{ height: '100%' }} />}
    mapElement={<div style={{ height: '20vh', width: '100%' }} />}
    {...props}
  />
);


export { Map, SchedulerMap, SchedulerGoogleMap };

Answer 1

只需将center道具传递给您的GoogleMap组件而不是defaultCenter道具。该center道具是可变的，而defaultZoom is not。

Answer 2

panTo()是 google.maps.Map 类的方法。（https://developers.google.com/maps/documentation/javascript/reference/map#Map.panTo）

这似乎是您正在寻找的函数，因此您需要通过引用您为地图设置的 className 在谷歌地图上调用它，然后为该方法提供panTo您LatLang创建的对象：

window.google.maps.Map(document.getElementsByClassName("google-map")).panTo(newLocation);