App.xaml.cpp

//
// App.xaml.cpp
// Implementation of the App class.
//

#include "pch.h"
#include "MainPage.xaml.h"

using namespace CppUWPSample;

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::Navigation;

/// <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 such as when the application is launched to open a specific file.
/// </summary>
/// <param name="e">Details about the launch request and process.</param>
void App::OnLaunched(Windows::ApplicationModel::Activation::LaunchActivatedEventArgs^ e)
{
	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();

		rootFrame->NavigationFailed += ref new Windows::UI::Xaml::Navigation::NavigationFailedEventHandler(this, &App::OnNavigationFailed);

		if (e->PreviousExecutionState == ApplicationExecutionState::Terminated)
		{
			// TODO: Restore the saved session state only when appropriate, scheduling the
			// final launch steps after the restore is complete

		}

		if (rootFrame->Content == nullptr)
		{
			// When the navigation stack isn't restored navigate to the first page,
			// configuring the new page by passing required information as a navigation
			// parameter
			rootFrame->Navigate(TypeName(MainPage::typeid), e->Arguments);
		}
		// Place the frame in the current Window
		Window::Current->Content = rootFrame;
		// Ensure the current window is active
		Window::Current->Activate();
	}
	else
	{
		if (rootFrame->Content == nullptr)
		{
			// When the navigation stack isn't restored navigate to the first page,
			// configuring the new page by passing required information as a navigation
			// parameter
			rootFrame->Navigate(TypeName(MainPage::typeid), e->Arguments);
		}
		// Ensure the current window is active
		Window::Current->Activate();
	}
}

/// <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>
void App::OnSuspending(Object^ sender, SuspendingEventArgs^ e)
{
	(void) sender;	// Unused parameter
	(void) e;	// Unused parameter

	//TODO: Save application state and stop any background activity
}

/// <summary>
/// Invoked when Navigation to a certain page fails
/// </summary>
/// <param name="sender">The Frame which failed navigation</param>
/// <param name="e">Details about the navigation failure</param>
void App::OnNavigationFailed(Platform::Object ^sender, Windows::UI::Xaml::Navigation::NavigationFailedEventArgs ^e)
{
	throw ref new FailureException("Failed to load Page " + e->SourcePageType.Name);
}