using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Runtime.InteropServices.WindowsRuntime; using Windows.ApplicationModel; using Windows.ApplicationModel.Activation; using Windows.Foundation; using Windows.Foundation.Collections; using Windows.UI.Xaml; using Windows.UI.Xaml.Controls; using Windows.UI.Xaml.Controls.Primitives; using Windows.UI.Xaml.Data; using Windows.UI.Xaml.Input; using Windows.UI.Xaml.Media; using Windows.UI.Xaml.Media.Animation; using Windows.UI.Xaml.Navigation; // The Blank Application template is documented at http://go.microsoft.com/fwlink/?LinkId=391641 namespace Xamarin.Forms.ControlGallery.WindowsPhone { /// /// Provides application-specific behavior to supplement the default Application class. /// public sealed partial class App { TransitionCollection _transitions; /// /// Initializes the singleton application object. This is the first line of authored code /// executed, and as such is the logical equivalent of main() or WinMain(). /// public App() { InitializeComponent(); Suspending += OnSuspending; } /// /// Invoked when the application is launched normally by the end user. Other entry points /// will be used when the application is launched to open a specific file, to display /// search results, and so forth. /// /// Details about the launch request and process. protected override void OnLaunched(LaunchActivatedEventArgs e) { #if DEBUG if (System.Diagnostics.Debugger.IsAttached) { DebugSettings.EnableFrameRateCounter = true; } #endif var rootFrame = Window.Current.Content as global::Windows.UI.Xaml.Controls.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 global::Windows.UI.Xaml.Controls.Frame(); // TODO: change this value to a cache size that is appropriate for your application rootFrame.CacheSize = 1; Forms.Init (e); FormsMaps.Init (Controls.App.Secrets["WinPhoneMapsAuthKey"]); if (e.PreviousExecutionState == ApplicationExecutionState.Terminated) { // TODO: Load state from previously suspended application } // Place the frame in the current Window Window.Current.Content = rootFrame; } if (rootFrame.Content == null) { // Removes the turnstile navigation for startup. if (rootFrame.ContentTransitions != null) { _transitions = new TransitionCollection(); foreach (var c in rootFrame.ContentTransitions) { _transitions.Add(c); } } rootFrame.ContentTransitions = null; rootFrame.Navigated += RootFrame_FirstNavigated; // When the navigation stack isn't restored navigate to the first page, // configuring the new page by passing required information as a navigation // parameter if (!rootFrame.Navigate(typeof(MainPage), e.Arguments)) { throw new Exception("Failed to create initial page"); } } // Ensure the current window is active Window.Current.Activate(); } /// /// Restores the content transitions after the app has launched. /// /// The object where the handler is attached. /// Details about the navigation event. void RootFrame_FirstNavigated(object sender, global::Windows.UI.Xaml.Navigation.NavigationEventArgs e) { var rootFrame = sender as global::Windows.UI.Xaml.Controls.Frame; rootFrame.ContentTransitions = _transitions ?? new TransitionCollection() { new NavigationThemeTransition() }; rootFrame.Navigated -= RootFrame_FirstNavigated; } /// /// 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. /// /// The source of the suspend request. /// Details about the suspend request. void OnSuspending(object sender, SuspendingEventArgs e) { var deferral = e.SuspendingOperation.GetDeferral(); // TODO: Save application state and stop any background activity deferral.Complete(); } } }