path: root/Juick/App.xaml.cs

using System;
using System.Windows;
using System.Windows.Navigation;
using Juick.Classes;
using Juick.ViewModels;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;

namespace Juick
{
    public partial class App : Application
    {
        public void NavigateTo(Uri param, bool removeFromStack = false)
        {
            var page = (PhoneApplicationPage) RootFrame.Content;
            var service = page.NavigationService;
            service.Navigate(param);
            if (removeFromStack)
            {
                page.Dispatcher.BeginInvoke(() => service.RemoveBackEntry());
            }
        }
        private static AppViewModel _context = null;

        public static AppViewModel AppContext
        {
            get
            {
                // Delay creation of the view model until necessary
                if (_context == null) {
                    _context = new AppViewModel();
                    _context.Pages.Add(new PageViewModel(_context) { RestUri = "/home?1=1", Caption = "My feed"});
                    _context.Pages.Add(new PageViewModel(_context) { RestUri = "/messages?1=1", Caption = "Last"});
                    _context.Pages.Add(new PageViewModel(_context) { RestUri = "/messages?1=1&popular=1", Caption = "Top"});
                    _context.Pages.Add(new PageViewModel(_context) { RestUri = "/messages?1=1&media=all", Caption = "Images" });
                };
                return _context;
            }
        }        
        /// <summary>
        /// Provides easy access to the root frame of the Phone Application.
        /// </summary>
        /// <returns>The root frame of the Phone Application.</returns>
        public PhoneApplicationFrame RootFrame { get; private set; }

        /// <summary>
        /// Constructor for the Application object.
        /// </summary>
        public App()
        {
            // Global handler for uncaught exceptions. 
            UnhandledException += Application_UnhandledException;

            // Standard Silverlight initialization
            InitializeComponent();

            // Phone-specific initialization
            InitializePhoneApplication();

            // Show graphics profiling information while debugging.
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // Display the current frame rate counters.
                Current.Host.Settings.EnableFrameRateCounter = true;

                // Show the areas of the app that are being redrawn in each frame.
                //Application.Current.Host.Settings.EnableRedrawRegions = true;

                // Enable non-production analysis visualization mode, 
                // which shows areas of a page that are handed off to GPU with a colored overlay.
                //Application.Current.Host.Settings.EnableCacheVisualization = true;

                // Disable the application idle detection by setting the UserIdleDetectionMode property of the
                // application's PhoneApplicationService object to Disabled.
                // Caution:- Use this under debug mode only. Application that disables user idle detection will continue to run
                // and consume battery power when the user is not using the phone.
                PhoneApplicationService.Current.UserIdleDetectionMode = IdleDetectionMode.Disabled;
            }

        }

        // Code to execute when the application is launching (eg, from Start)
        // This code will not execute when the application is reactivated
        private void Application_Launching(object sender, LaunchingEventArgs e)
        {
            const string JuickCaption = "Juick";
            TileHelper.UpdateFlipTile(
                JuickCaption,
                string.Empty,
                JuickCaption,
                JuickCaption,
                null,
                "/ApplicationSmallTile.png",
                "/ApplicationTile.png",
                null,
                "/ApplicationWideTile.png",
                null);
            RootFrame.UriMapper = new MyUriMapper();
        }

        // Code to execute when the application is activated (brought to foreground)
        // This code will not execute when the application is first launched
        private void Application_Activated(object sender, ActivatedEventArgs e)
        {
            if (e.IsApplicationInstancePreserved == false)
            {
                RootFrame.UriMapper = new MyUriMapper();
            }
        }

        // Code to execute when the application is deactivated (sent to background)
        // This code will not execute when the application is closing
        private void Application_Deactivated(object sender, DeactivatedEventArgs e)
        {
            // Ensure that required application state is persisted here.
        }

        // Code to execute when the application is closing (eg, user hit Back)
        // This code will not execute when the application is deactivated
        private void Application_Closing(object sender, ClosingEventArgs e)
        {
        }

        // Code to execute if a navigation fails
        private void RootFrame_NavigationFailed(object sender, NavigationFailedEventArgs e)
        {
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // A navigation has failed; break into the debugger
                System.Diagnostics.Debugger.Break();
            }
        }

        // Code to execute on Unhandled Exceptions
        private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
        {
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // An unhandled exception has occurred; break into the debugger
                System.Diagnostics.Debugger.Break();
            }
        }

        #region Phone application initialization

        public enum SessionType
        {
            None,
            Home,
            DeepLink
        }

        // Avoid double-initialization
        private bool phoneApplicationInitialized = false;

        // Set to Home when the app is launched from Primary tile.
        // Set to DeepLink when the app is launched from Deep Link.
        private SessionType _sessionType = SessionType.None;

        // Set to true when the page navigation is being reset 
        private bool _wasRelaunched = false;

        // set to true when 5 min passed since the app was relaunched
        private bool _mustClearPagestack = false;

        // Do not add any additional code to this method
        private void InitializePhoneApplication()
        {
            if (phoneApplicationInitialized)
                return;

            // Create the frame but don't set it as RootVisual yet; this allows the splash
            // screen to remain active until the application is ready to render.
            RootFrame = new PhoneApplicationFrame();
            RootFrame.Navigated += CompleteInitializePhoneApplication;

            // Handle navigation failures
            RootFrame.NavigationFailed += RootFrame_NavigationFailed;

            RootFrame.Navigated += CheckForResetNavigation;

            RootFrame.Navigating += RootFrame_Navigating;

            RootFrame.UriMapper = new MyUriMapper();

            // Ensure we don't initialize again
            phoneApplicationInitialized = true;
        }

        void RootFrame_Navigating(object sender, NavigatingCancelEventArgs e)
        {
            // If the session type is None or New, check the navigation Uri to determine if the
            // navigation is a deep link or if it points to the app's main page.
            if (_sessionType == SessionType.None && e.NavigationMode == NavigationMode.New)
            {
                // This block will run if the current navigation is part of the app's intial launch


                // Keep track of Session Type 
                if (e.Uri.ToString().Contains("ShareContent") || e.Uri.ToString().Contains("mid"))
                {
                    _sessionType = SessionType.DeepLink;
                }
                else if (e.Uri.ToString().Contains("/MainPage.xaml"))
                {
                    _sessionType = SessionType.Home;
                }
            }



            if (e.NavigationMode == NavigationMode.Reset)
            {
                // This block will execute if the current navigation is a relaunch.
                // If so, another navigation will be coming, so this records that a relaunch just happened
                // so that the next navigation can use this info.
                _wasRelaunched = true;
            }
            else if (e.NavigationMode == NavigationMode.New && _wasRelaunched)
            {
                // This block will run if the previous navigation was a relaunch
                _wasRelaunched = false;

                if (e.Uri.ToString().Contains("ShareContent") || e.Uri.ToString().Contains("mid"))
                {
                    // This block will run if the launch Uri contains "DeepLink=true" which
                    // was specified when the secondary tile was created in MainPage.xaml.cs

                    _sessionType = SessionType.DeepLink;
                    // The app was relaunched via a Deep Link.
                    // The page stack will be cleared.
                }
                else if (e.Uri.OriginalString.Contains("/MainPage.xaml"))
                {
                    // This block will run if the navigation Uri is the main page
                    if (_sessionType == SessionType.DeepLink)
                    {
                        // When the app was previously launched via Deep Link and relaunched via Main Tile, we need to clear the page stack. 
                        _sessionType = SessionType.Home;
                    }
                    else
                    {
                        if (!_mustClearPagestack)
                        {
                            //The app was previously launched via Main Tile and relaunched via Main Tile. Cancel the navigation to resume.
                            e.Cancel = true;
                            RootFrame.Navigated -= ClearBackStackAfterReset;
                        }
                    }
                }

                _mustClearPagestack = false;
            }
            else if (e.NavigationMode == NavigationMode.New && !_wasRelaunched && e.Uri.ToString().Contains("/MainPage.xaml"))
            {
                // Home button: Any time we do a forward nav to "MainPage" we assume it's from the Home button, so we clear the backstack
                RootFrame.Navigated += ClearBackStackAfterReset;
            }
        }

        // Do not add any additional code to this method
        private void CompleteInitializePhoneApplication(object sender, NavigationEventArgs e)
        {
            // Set the root visual to allow the application to render
            if (RootVisual != RootFrame)
                RootVisual = RootFrame;

            // Remove this handler since it is no longer needed
            RootFrame.Navigated -= CompleteInitializePhoneApplication;
        }

        private void CheckForResetNavigation(object sender, NavigationEventArgs e)
        {
            // If the app has received a 'reset' navigation, then we need to check
            // on the next navigation to see if the page stack should be reset
            if (e.NavigationMode == NavigationMode.Reset)
                RootFrame.Navigated += ClearBackStackAfterReset;
        }

        private void ClearBackStackAfterReset(object sender, NavigationEventArgs e)
        {
            // Unregister the event so it doesn't get called again
            RootFrame.Navigated -= ClearBackStackAfterReset;

            // Only clear the stack for 'new' (forward) and 'refresh' navigations
            if (e.NavigationMode != NavigationMode.New)
                return;

            // For UI consistency, clear the entire page stack
            while (RootFrame.RemoveBackEntry() != null)
            {
                ; // do nothing
            }
        }

        #endregion
    }
}