@tarojs/taro-h5/dist/api/device/compass.js

Taro h5 framework

import throttle from 'lodash-es/throttle';
import { CallbackManager, MethodHandler } from '../../utils/handler.js';
import { getDeviceInfo } from '../base/system.js';

const callbackManager = new CallbackManager();
let compassListener;
/**
 * Note: 按系统类型获取对应绝对 orientation 事件名，因为安卓系统中直接监听 deviceorientation 事件得到的不是绝对 orientation
 */
const deviceorientationEventName = ['absolutedeviceorientation', 'deviceorientationabsolute', 'deviceorientation'].find(item => {
    if ('on' + item in window) {
        return item;
    }
}) || '';
/**
 * 停止监听罗盘数据
 */
const stopCompass = ({ success, fail, complete } = {}) => {
    const handle = new MethodHandler({ name: 'stopCompass', success, fail, complete });
    try {
        window.removeEventListener(deviceorientationEventName, compassListener, true);
        return handle.success();
    }
    catch (e) {
        return handle.fail({ errMsg: e.message });
    }
};
let CompassChangeTrigger = false;
/**
 * 开始监听罗盘数据
 */
const startCompass = ({ success, fail, complete } = {}) => {
    const handle = new MethodHandler({ name: 'startCompass', success, fail, complete });
    try {
        if (deviceorientationEventName !== '') {
            if (compassListener) {
                stopCompass();
            }
            compassListener = throttle((evt) => {
                const isAndroid = getDeviceInfo().system === 'AndroidOS';
                if (isAndroid && !evt.absolute && !CompassChangeTrigger) {
                    CompassChangeTrigger = true;
                    console.warn('Warning: In \'onCompassChange\', your browser is not supported to get the orientation relative to the earth, the orientation data will be related to the initial orientation of the device .');
                }
                const alpha = evt.alpha || 0;
                /**
                 * 由于平台差异，accuracy 在 iOS/Android 的值不同。
                 * - iOS：accuracy 是一个 number 类型的值，表示相对于磁北极的偏差。0 表示设备指向磁北，90 表示指向东，180 表示指向南，依此类推。
                 * - Android：accuracy 是一个 string 类型的枚举值。
                 */
                const accuracy = isAndroid ? evt.absolute ? 'high' : 'medium' : alpha;
                callbackManager.trigger({
                    direction: 360 - alpha,
                    accuracy: accuracy
                });
            }, 5000);
            window.addEventListener(deviceorientationEventName, compassListener, true);
        }
        else {
            throw new Error('compass is not supported');
        }
        return handle.success();
    }
    catch (e) {
        return handle.fail({ errMsg: e.message });
    }
};
/**
 * 监听罗盘数据变化事件。频率：5 次/秒，接口调用后会自动开始监听，可使用 wx.stopCompass 停止监听。
 */
const onCompassChange = callback => {
    callbackManager.add(callback);
};
/**
 * 取消监听罗盘数据变化事件，参数为空，则取消所有的事件监听。
 */
const offCompassChange = callback => {
    callbackManager.remove(callback);
};

export { offCompassChange, onCompassChange, startCompass, stopCompass };
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