cordova-plugin-screen-orientation/www/screenorientation.js

/*
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 *
 */
var screenOrientation = {};
if (!window.OrientationType) {
    window.OrientationType = {
        'portrait-primary': 0,
        'portrait-secondary': 180,
        'landscape-primary': 90,
        'landscape-secondary': -90
    };
}
if (!window.OrientationLockType) {
    window.OrientationLockType = {
        'portrait-primary': 1,
        'portrait-secondary': 2,
        'landscape-primary': 4,
        'landscape-secondary': 8,
        'portrait': 3, // either portrait-primary or portrait-secondary.
        'landscape': 12, // either landscape-primary or landscape-secondary.
        'any': 15 // All orientations are supported (unlocked orientation)
    };
}
var orientationMask = 1;
screenOrientation.setOrientation = function(orientation) {
    orientationMask = window.OrientationLockType[orientation];
    cordova.exec(null, null, "CDVOrientation", "screenOrientation", [orientationMask, orientation]);
};

if (!screen.orientation) {
    screen.orientation = {};
}

setOrientationProperties();

function addScreenOrientationApi(screenObject) {

    if (screenObject.unlock || screenObject.lock) {
        screenObject.nativeLock = screenObject.lock;
    }

    screenObject.lock = function(orientation) {
        var promiseLock;
        var p = new Promise(function(resolve, reject) {
            if (screenObject.nativeLock) {
                promiseLock = screenObject.nativeLock(orientation);
                promiseLock.then(function success(res) {
                    resolve();
                }, function error(err) {
                    screenObject.nativeLock = null;
                    resolveOrientation(orientation, resolve, reject);
                });
            } else {
                resolveOrientation(orientation, resolve, reject);
            }
        });
        return p;
    };
    screenObject.unlock = function() {
        screenOrientation.setOrientation('any');
    };
}

function resolveOrientation(orientation, resolve, reject) {
    if (!OrientationLockType.hasOwnProperty(orientation)) {
        var err = new Error();
        err.name = "NotSupportedError";
        reject(err); //"cannot change orientation");
    } else {
        screenOrientation.setOrientation(orientation);
        resolve("Orientation set"); // orientation change successful
    }

}

addScreenOrientationApi(screen.orientation);

var onChangeListener = null;

Object.defineProperty(screen.orientation, 'onchange', {
    set: function(listener) {

        if (onChangeListener) {
            screen.orientation.removeEventListener('change', onChangeListener);
        }
        onChangeListener = listener;
        if (onChangeListener) {
            screen.orientation.addEventListener('change', onChangeListener);
        }
    },
    get: function() {
        return (onChangeListener ? onChangeListener : null);
    },
    enumerable: true,
});


var evtTarget = new XMLHttpRequest(); //document.createElement('div');
var orientationchange = function() {
    setOrientationProperties();
    var event = document.createEvent('Events');
    event.initEvent("change", false, false);
    evtTarget.dispatchEvent(event);
};

screen.orientation.addEventListener = function(a,b,c) {
    return evtTarget.addEventListener(a,b,c);
};

screen.orientation.removeEventListener = function(a,b,c) {
    return evtTarget.removeEventListener(a,b,c);
};

function setOrientationProperties() {
    switch (window.orientation) {
        case 0:
            screen.orientation.type = 'portrait-primary';
            break;
        case 90:
            screen.orientation.type = 'landscape-primary';
            break;
        case 180:
            screen.orientation.type = 'portrait-secondary';
            break;
        case -90:
            screen.orientation.type = 'landscape-secondary';
            break;
        default:
            screen.orientation.type = 'portrait-primary';
            break;
    }
    screen.orientation.angle = window.orientation || 0;

}
window.addEventListener("orientationchange", orientationchange, true);

module.exports = screenOrientation;