geolocation.ts
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import { EmitterSubscription } from "react-native";
import { addLocationListener, start, stop, _options } from "./amap-geolocation";
import { ILocation as Location } from "./gen-types";
/**
* 坐标信息
*
* @see https://developer.mozilla.org/zh-CN/docs/Web/API/Coordinates
*/
export interface Coordinates {
latitude: number;
longitude: number;
altitude: number;
accuracy: number;
altitudeAccuracy: number;
heading: number;
speed: number;
}
/**
* 定位信息
*
* @see https://developer.mozilla.org/zh-CN/docs/Web/API/Position
*/
export interface Position {
coords: Coordinates;
timestamp: number;
location: Location;
}
/**
* 定位错误信息
*
* @see https://developer.mozilla.org/zh-CN/docs/Web/API/PositionError
*/
export class PositionError {
static PERMISSION_DENIED: 1;
static POSITION_UNAVAILABLE: 2;
static TIMEOUT: 3;
code: number;
message: string;
location: Location;
constructor(code: number, message: string, location: Location) {
this.code = code;
this.message = message;
this.location = location;
}
}
/**
* 定位选项
*
* @see https://developer.mozilla.org/zh-CN/docs/Web/API/PositionOptions
*/
export interface PositionOptions {
timeout?: number;
maximumAge?: number;
enableHighAccuracy?: boolean;
/**
* @see [[setDistanceFilter]]
*/
distanceFilter?: number;
}
let watchId = 0;
const watchMap: { [watchId: number]: EmitterSubscription } = {};
/**
* @see https://developer.mozilla.org/zh-CN/docs/Web/API/Geolocation
*/
export default class Geolocation {
/**
* 获取当前位置信息
*
* 注意：使用该方法会停止持续定位
*
* @see https://developer.mozilla.org/zh-CN/docs/Web/API/Geolocation/getCurrentPosition
*/
static getCurrentPosition(
success: (position: Position) => void,
error?: (error: PositionError) => void
// options: PositionOptions = {}
) {
const listener = addLocationListener((location) => {
if (location.errorCode) {
error && error(new PositionError(location.errorCode, location.errorInfo ?? "", location));
stop();
return listener.remove();
}
if (_options.locatingWithReGeocode && typeof location.address !== "string") {
return;
}
success(toPosition(location));
stop();
return listener.remove();
});
start();
}
/**
* 注册监听器进行持续定位
*
* @see https://developer.mozilla.org/zh-CN/docs/Web/API/Geolocation/watchPosition
*/
static watchPosition(
success: (position: Position) => void,
error?: (error: PositionError) => void
// options?: PositionOptions
) {
watchMap[++watchId] = addLocationListener((location) => {
if (location.errorCode) {
error && error(new PositionError(location.errorCode, location.errorInfo ?? "", location));
} else {
success(toPosition(location));
}
});
start();
return watchId;
}
/**
* 移除位置监听
*
* @see https://developer.mozilla.org/zh-CN/docs/Web/API/Geolocation/clearWatch
*/
static clearWatch(id: number) {
const listener = watchMap[id];
if (listener) {
listener.remove();
}
}
}
function toPosition(location: Location) {
return {
location,
coords: {
latitude: location.latitude,
longitude: location.longitude,
altitude: location.altitude ?? 0,
accuracy: location.accuracy,
altitudeAccuracy: 0, // 高德定位接口没有找到对应的数据
heading: location.heading ?? 0,
speed: location.speed ?? 0,
},
timestamp: location.timestamp ?? 0,
};
}