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samples/winrt_universal/PhoneTutorial/App.xaml.cpp

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+//
+// App.xaml.cpp
+// Implementation of the App class.
+//
+
+#include "pch.h"
+#include "MainPage.xaml.h"
+
+using namespace PhoneTutorial;
+
+using namespace Platform;
+using namespace Windows::ApplicationModel;
+using namespace Windows::ApplicationModel::Activation;
+using namespace Windows::Foundation;
+using namespace Windows::Foundation::Collections;
+using namespace Windows::UI::Xaml;
+using namespace Windows::UI::Xaml::Controls;
+using namespace Windows::UI::Xaml::Controls::Primitives;
+using namespace Windows::UI::Xaml::Data;
+using namespace Windows::UI::Xaml::Input;
+using namespace Windows::UI::Xaml::Interop;
+using namespace Windows::UI::Xaml::Media;
+using namespace Windows::UI::Xaml::Media::Animation;
+using namespace Windows::UI::Xaml::Navigation;
+
+// The Blank Application template is documented at http://go.microsoft.com/fwlink/?LinkID=391641
+
+/// <summary>
+/// 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().
+/// </summary>
+App::App()
+{
+    InitializeComponent();
+    Suspending += ref new SuspendingEventHandler(this, &App::OnSuspending);
+}
+
+/// <summary>
+/// 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.
+/// </summary>
+/// <param name="e">Details about the launch request and process.</param>
+void App::OnLaunched(LaunchActivatedEventArgs^ e)
+{
+#if _DEBUG
+    if (IsDebuggerPresent())
+    {
+        DebugSettings->EnableFrameRateCounter = true;
+    }
+#endif
+
+    auto rootFrame = dynamic_cast<Frame^>(Window::Current->Content);
+
+    // Do not repeat app initialization when the Window already has content,
+    // just ensure that the window is active.
+    if (rootFrame == nullptr)
+    {
+        // Create a Frame to act as the navigation context and associate it with
+        // a SuspensionManager key
+        rootFrame = ref new Frame();
+
+        // TODO: Change this value to a cache size that is appropriate for your application.
+        rootFrame->CacheSize = 1;
+
+        if (e->PreviousExecutionState == ApplicationExecutionState::Terminated)
+        {
+            // TODO: Restore the saved session state only when appropriate, scheduling the
+            // final launch steps after the restore is complete.
+        }
+
+        // Place the frame in the current Window
+        Window::Current->Content = rootFrame;
+    }
+
+    if (rootFrame->Content == nullptr)
+    {
+        // Removes the turnstile navigation for startup.
+        if (rootFrame->ContentTransitions != nullptr)
+        {
+            _transitions = ref new TransitionCollection();
+            for (auto transition : rootFrame->ContentTransitions)
+            {
+                _transitions->Append(transition);
+            }
+        }
+
+        rootFrame->ContentTransitions = nullptr;
+        _firstNavigatedToken = rootFrame->Navigated += ref new NavigatedEventHandler(this, &App::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(MainPage::typeid, e->Arguments))
+        {
+            throw ref new FailureException("Failed to create initial page");
+        }
+    }
+
+    // Ensure the current window is active
+    Window::Current->Activate();
+}
+
+/// <summary>
+/// Restores the content transitions after the app has launched.
+/// </summary>
+void App::RootFrame_FirstNavigated(Object^ sender, NavigationEventArgs^ e)
+{
+    auto rootFrame = safe_cast<Frame^>(sender);
+
+    TransitionCollection^ newTransitions;
+    if (_transitions == nullptr)
+    {
+        newTransitions = ref new TransitionCollection();
+        newTransitions->Append(ref new NavigationThemeTransition());
+    }
+    else
+    {
+        newTransitions = _transitions;
+    }
+
+    rootFrame->ContentTransitions = newTransitions;
+    rootFrame->Navigated -= _firstNavigatedToken;
+}
+
+/// <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>
+void App::OnSuspending(Object^ sender, SuspendingEventArgs^ e)
+{
+    (void) sender;	// Unused parameter
+    (void) e;		// Unused parameter
+
+    // TODO: Save application state and stop any background activity
+}