示例#1
0
        /// <summary>
        /// Invoked when application execution is being suspended. Application state is saved
        /// without knowing whether the application will be terminated or resumed with the contents
        /// of memory still intact.
        /// </summary>
        /// <param name="sender">The source of the suspend request.</param>
        /// <param name="e">Details about the suspend request.</param>
        private async void OnSuspending(object sender, SuspendingEventArgs e)
        {
            IsSuspending = true;
            try
            {
                var deferral = e.SuspendingOperation.GetDeferral();

                //Bootstrap inform navigation service that app is suspending.
                NavigationService.Suspending();

                // Save application state
                await SessionStateService.SaveAsync();

                deferral.Complete();
            }
            finally
            {
                IsSuspending = false;
            }
        }
        /// <summary>
        /// Initializes the Frame and its content.
        /// </summary>
        /// <param name="args">The <see cref="IActivatedEventArgs"/> instance containing the event data.</param>
        /// <returns>A task of a Frame that holds the app content.</returns>
        protected async Task<Frame> InitializeFrameAsync(IActivatedEventArgs args)
        {
            var rootFrame = Window.Current.Content as Frame;
            // Do not repeat app initialization when the Window already has content,
            // just ensure that the window is active
            if (rootFrame == null)
            {
                // Create a Frame to act as the navigation context and navigate to the first page
                rootFrame = (RootFrameFactory != null ? RootFrameFactory() : new Frame());

                if (ExtendedSplashScreenFactory != null)
                {
                    Page extendedSplashScreen = this.ExtendedSplashScreenFactory.Invoke(args.SplashScreen);
                    rootFrame.Content = extendedSplashScreen;
                }
                var frameFacade = new FrameFacadeAdapter(rootFrame);

                //Initialize MvvmAppBase common services
                SessionStateService = new SessionStateService();

                //Configure VisualStateAwarePage with the ability to get the session state for its frame
                VisualStateAwarePage.GetSessionStateForFrame =
                    frame => SessionStateService.GetSessionStateForFrame(frameFacade);

                //Associate the frame with a key
                SessionStateService.RegisterFrame(frameFacade, "AppFrame");

                NavigationService = CreateNavigationService(frameFacade, SessionStateService);
#if WINDOWS_APP
                SettingsPane.GetForCurrentView().CommandsRequested += OnCommandsRequested;
#endif

#if WINDOWS_PHONE_APP
                HardwareButtons.BackPressed += OnHardwareButtonsBackPressed;
#endif

                // Set a factory for the ViewModelLocator to use the default resolution mechanism to construct view models
                ViewModelLocationProvider.SetDefaultViewModelFactory(Resolve);

                OnRegisterKnownTypesForSerialization();
                if (args.PreviousExecutionState == ApplicationExecutionState.Terminated)
                {
                    await SessionStateService.RestoreSessionStateAsync();
                }

                await OnInitializeAsync(args);
                if (args.PreviousExecutionState == ApplicationExecutionState.Terminated)
                {
                    // Restore the saved session state and navigate to the last page visited
                    try
                    {
                        SessionStateService.RestoreFrameState();
                        NavigationService.RestoreSavedNavigation();
                        _isRestoringFromTermination = true;
                    }
                    catch (SessionStateServiceException)
                    {
                        // Something went wrong restoring state.
                        // Assume there is no state and continue
                    }
                }
                // Place the frame in the current Window
                Window.Current.Content = rootFrame;
            }

            return rootFrame;
        }
示例#3
0
        /// <summary>
        /// Initializes the Frame and its content.
        /// </summary>
        /// <param name="args">The <see cref="IActivatedEventArgs"/> instance containing the event data.</param>
        /// <returns>A task of a Frame that holds the app content.</returns>
        protected async Task <Frame> InitializeFrameAsync(IActivatedEventArgs args)
        {
            var rootFrame = Window.Current.Content as Frame;

            // Do not repeat app initialization when the Window already has content,
            // just ensure that the window is active
            if (rootFrame == null)
            {
                // Create a Frame to act as the navigation context and navigate to the first page
                rootFrame = new Frame();

                if (ExtendedSplashScreenFactory != null)
                {
                    Page extendedSplashScreen = this.ExtendedSplashScreenFactory.Invoke(args.SplashScreen);
                    rootFrame.Content = extendedSplashScreen;
                }
                var frameFacade = new FrameFacadeAdapter(rootFrame);

                //Initialize MvvmAppBase common services
                SessionStateService = new SessionStateService();

                //Configure VisualStateAwarePage with the ability to get the session state for its frame
                VisualStateAwarePage.GetSessionStateForFrame =
                    frame => SessionStateService.GetSessionStateForFrame(frameFacade);

                //Associate the frame with a key
                SessionStateService.RegisterFrame(frameFacade, "AppFrame");

                NavigationService = CreateNavigationService(frameFacade, SessionStateService);
#if WINDOWS_APP
                SettingsPane.GetForCurrentView().CommandsRequested += OnCommandsRequested;
#endif

#if WINDOWS_PHONE_APP
                HardwareButtons.BackPressed += OnHardwareButtonsBackPressed;
#endif

                // Set a factory for the ViewModelLocator to use the default resolution mechanism to construct view models
                ViewModelLocationProvider.SetDefaultViewModelFactory(Resolve);

                OnRegisterKnownTypesForSerialization();
                if (args.PreviousExecutionState == ApplicationExecutionState.Terminated)
                {
                    await SessionStateService.RestoreSessionStateAsync();
                }

                await OnInitializeAsync(args);

                if (args.PreviousExecutionState == ApplicationExecutionState.Terminated)
                {
                    // Restore the saved session state and navigate to the last page visited
                    try
                    {
                        SessionStateService.RestoreFrameState();
                        NavigationService.RestoreSavedNavigation();
                        _isRestoringFromTermination = true;
                    }
                    catch (SessionStateServiceException)
                    {
                        // Something went wrong restoring state.
                        // Assume there is no state and continue
                    }
                }
                // Place the frame in the current Window
                Window.Current.Content = rootFrame;
            }

            return(rootFrame);
        }