compass.ts

import {
  defineAsyncApi,
  API_ON_COMPASS,
  API_TYPE_ON_COMPASS_CHANGE,
  API_OFF_COMPASS,
  API_TYPE_OFF_COMPASS_CHANGE,
  API_START_COMPASS,
  API_TYPE_START_COMPASS,
  API_STOP_COMPASS,
  API_TYPE_STOP_COMPASS,
  defineOnApi,
  defineOffApi,
} from '@dcloudio/uni-api'
import { DEVICE_FREQUENCY } from '../constants'

let listener: number | null = null

export const onCompassChange = <API_TYPE_ON_COMPASS_CHANGE>(
  defineOnApi(API_ON_COMPASS, () => {
    startCompass()
  })
)

export const offCompassChange = <API_TYPE_OFF_COMPASS_CHANGE>(
  defineOffApi(API_OFF_COMPASS, () => {
    stopCompass()
  })
)

export const startCompass = <API_TYPE_START_COMPASS>(
  defineAsyncApi(API_START_COMPASS, (_, { resolve, reject }) => {
    if (!listener) {
      listener = plus.orientation.watchOrientation(
        (res) => {
          UniServiceJSBridge.invokeOnCallback(API_ON_COMPASS, {
            direction: res.magneticHeading,
          })
        },
        (err) => {
          reject(err.message)
          listener = null
        },
        {
          frequency: DEVICE_FREQUENCY,
        }
      )
    }
    setTimeout(resolve, DEVICE_FREQUENCY)
  })
)

export const stopCompass = <API_TYPE_STOP_COMPASS>(
  defineAsyncApi(API_STOP_COMPASS, (_, { resolve }) => {
    if (listener) {
      plus.orientation.clearWatch(listener)
      listener = null
    }
    resolve()
  })
)