src/wp/YoikScreenOrientation.cs

/*
 *
 * 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.
 *
*/

using System;
using System.Net;
using System.IO;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Notification;
using Microsoft.Phone.Shell;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Threading;
using System.Runtime.Serialization;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.Threading;

using WPCordovaClassLib.Cordova;
using WPCordovaClassLib.Cordova.Commands;
using WPCordovaClassLib.Cordova.JSON;


namespace WPCordovaClassLib.Cordova.Commands
{
    public class YoikScreenOrientation : BaseCommand
    {
        #region Static members
        private const string UNLOCKED = "unlocked";

        private const string PORTRAIT = "portrait";
        private const string PORTRAIT_PRIMARY = "portrait-primary";
        private const string PORTRAIT_SECONDARY = "portrait-secondary";

        private const string LANDSCAPE = "landscape";
        private const string LANDSCAPE_PRIMARY = "landscape-primary";
        private const string LANDSCAPE_SECONDARY = "landscape-secondary";

        #endregion

        /// <summary>
        /// Current orientation
        /// </summary>
        private string currentOrientation;

        public YoikScreenOrientation()
        {

        }

        /// <summary>
        /// Changes the orientation
        /// </summary>

        public void screenOrientation(string options)
        {
            string orientation = null;
            try
            {
                orientation = JSON.JsonHelper.Deserialize<string[]>(options)[0];
            }
            catch (Exception ex)
            {
                this.DispatchCommandResult(new PluginResult(PluginResult.Status.JSON_EXCEPTION, ex.Message));
                return;
            }

            if (string.IsNullOrEmpty(orientation))
            {
                this.DispatchCommandResult(new PluginResult(PluginResult.Status.JSON_EXCEPTION));
                return;
            }

            if (this.currentOrientation != orientation) // Might prevent flickering
            {

                Deployment.Current.Dispatcher.BeginInvoke(() =>
                {
                    PhoneApplicationFrame frame;
                    PhoneApplicationPage page;
                    if (TryCast(Application.Current.RootVisual, out frame) &&
                      TryCast(frame.Content, out page))
                    {
                        if (orientation == PORTRAIT || orientation == PORTRAIT_PRIMARY || orientation == PORTRAIT_SECONDARY)
                        {
                            page.SupportedOrientations = SupportedPageOrientation.Portrait;
                        }

                        else if (orientation == LANDSCAPE || orientation == LANDSCAPE_PRIMARY || orientation == LANDSCAPE_SECONDARY)
                        {
                            page.SupportedOrientations = SupportedPageOrientation.Landscape;
                        }
                        else if (orientation == UNLOCKED)
                        {
                            page.SupportedOrientations = SupportedPageOrientation.PortraitOrLandscape;
                        }
                        else
                        {
                            this.DispatchCommandResult(new PluginResult(PluginResult.Status.ERROR, "Screen orientation not detected."));
                            return;
                        }
                        this.currentOrientation = orientation;
                    }
                });

                this.DispatchCommandResult();
            }
        }

        static bool TryCast<T>(object obj, out T result) where T : class
        {
            result = obj as T;
            return result != null;
        }
    }
}