cordova-plugin-splashscreen/src/wp/SplashScreen.cs

/*  
    Licensed 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.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 Microsoft.Phone.Info;
using System.Windows.Controls.Primitives;
using System.Diagnostics;
using System.Windows.Media.Imaging;
using System.Windows.Resources;
using System.IO;
using System.Xml.Linq;
using System.Linq;
using System.Windows.Threading;

namespace WPCordovaClassLib.Cordova.Commands
{
    /// <summary>
    /// Listens for changes to the state of the battery on the device.
    /// Currently only the "isPlugged" parameter available via native APIs.
    /// </summary>
    public class SplashScreen : BaseCommand
    {
        private readonly Preferences preferences = new Preferences();
        private Popup popup;

        private static bool WasShown = false;

        public SplashScreen()
        {
            this.LoadPreferencesFromConfiguration();

            Image SplashScreen = new Image()
            {
                Height = Application.Current.Host.Content.ActualHeight,
                Width = Application.Current.Host.Content.ActualWidth,
                Stretch = Stretch.Fill
            };

            var imageResource = Application.GetResourceStream(preferences.SplashScreenImage);
            if (imageResource != null)
            {
                BitmapImage splash_image = new BitmapImage();
                splash_image.SetSource(imageResource.Stream);
                SplashScreen.Source = splash_image;
            }

            // Instansiate the popup and set the Child property of Popup to SplashScreen
            this.popup = new Popup() { IsOpen = false, Child = SplashScreen };
            // Orient the popup accordingly
            this.popup.HorizontalAlignment = HorizontalAlignment.Stretch;
            this.popup.VerticalAlignment = VerticalAlignment.Center;
        }

        public override void OnInit()
        {
            // we only want to autoload the first time a page is loaded.
            if (!WasShown)
            {
                WasShown = true;
                this.show();
            }
        }

        private static void GetPreference(XDocument document, string preferenceName, Action<string> action)
        {
            var attribute = from results in document.Descendants()
                            where (string)results.Attribute("name") == preferenceName
                            select (string)results.Attribute("value");

            var value = attribute.FirstOrDefault();
            if (!string.IsNullOrWhiteSpace(value))
            {
                action(value);
            }      
        }

        private void LoadPreferencesFromConfiguration()
        {
            StreamResourceInfo streamInfo = Application.GetResourceStream(new Uri("config.xml", UriKind.Relative));
            if (streamInfo != null)
            {
                using (StreamReader sr = new StreamReader(streamInfo.Stream))
                {
                    //This will Read Keys Collection for the xml file
                    XDocument document = XDocument.Parse(sr.ReadToEnd());

                    GetPreference(document, "AutoHideSplashScreen", value =>
                    {
                        var autoHideSplashScreen = false;
                        if (bool.TryParse(value, out autoHideSplashScreen))
                        {
                            preferences.AutoHideSplashScreen = autoHideSplashScreen;
                        }
                    });

                    GetPreference(document, "SplashScreenDelay", value =>
                    {
                        var splashScreenDelay = 0;
                        if (int.TryParse(value, out splashScreenDelay))
                        {
                            preferences.SplashScreenDelay = splashScreenDelay;
                        }
                    });

                    GetPreference(document, "SplashScreen", value => preferences.SplashScreenImage = new Uri(value, UriKind.Relative));
                }
            }
        }

        public void show(string options = null)
        {
            Deployment.Current.Dispatcher.BeginInvoke(() =>
            {
                if (this.popup.IsOpen)
                {
                    return;
                }

                this.popup.Child.Opacity = 0;

                Storyboard story = new Storyboard();
                DoubleAnimation animation;
                animation = new DoubleAnimation();
                animation.From = 0.0;
                animation.To = 1.0;
                animation.Duration = new Duration(TimeSpan.FromSeconds(0.2));

                Storyboard.SetTarget(animation, popup.Child);
                Storyboard.SetTargetProperty(animation, new PropertyPath("Opacity"));
                story.Children.Add(animation);

                Debug.WriteLine("Fading the splash screen in");

                story.Begin();

                this.popup.IsOpen = true;

                if (this.preferences.AutoHideSplashScreen)
                {
                    this.StartAutoHideTimer();
                }
            });
        }

        public void hide(string options = null)
        {
            Deployment.Current.Dispatcher.BeginInvoke(() =>
            {
                if (!popup.IsOpen)
                {
                    return;
                }

                popup.Child.Opacity = 1.0;

                Storyboard story = new Storyboard();
                DoubleAnimation animation;
                animation = new DoubleAnimation();
                animation.From = 1.0;
                animation.To = 0.0;
                animation.Duration = new Duration(TimeSpan.FromSeconds(0.4));

                Storyboard.SetTarget(animation, popup.Child);
                Storyboard.SetTargetProperty(animation, new PropertyPath("Opacity"));
                story.Children.Add(animation);
                story.Completed += (object sender, EventArgs e) =>
                {
                    popup.IsOpen = false;
                };
                story.Begin();
            });
        }

        private void StartAutoHideTimer()
        {
            var timer = new DispatcherTimer() { Interval = TimeSpan.FromMilliseconds(preferences.SplashScreenDelay) };
            timer.Tick += (object sender, EventArgs e) =>
            {
                this.hide();
                timer.Stop();
            };
            timer.Start();
        }

        private class Preferences
        {
            public bool AutoHideSplashScreen { get; set; }
            public Uri SplashScreenImage { get; set; }
            public int SplashScreenDelay { get; set; }

            public Preferences()
            {
                this.SplashScreenDelay = 3000;
                this.AutoHideSplashScreen = true;
                this.SplashScreenImage = new Uri("SplashScreenImage.jpg", UriKind.Relative);
            }
        }
    }
}