/// <summary>
/// Handles the Navigated event.
/// </summary>
/// <param name="viewModelToBind">ViewModel to be bound to the target view or null</param>
private void SubscribeNavigatedHandler(NavigableViewModelBase viewModelToBind)
{
NavigatedEventHandler navigatedHandler = null;
navigatedHandler = (sender, e) =>
{
_frame.Navigated -= navigatedHandler;
HandleServiceNavigatedToContent(e, viewModelToBind);
};
_frame.Navigated += navigatedHandler;
}
private void HandleServiceNavigatedToContent(NavigationEventArgs e, NavigableViewModelBase viewModelToBind)
{
_navigableViewModel.RaiseNavigatedFrom(e);
// Raise navigated to viewmodel event if the target view defines navigable view model
FrameworkElement element = e.Content as FrameworkElement;
if (element != null)
{
RoutedEventHandler elementLoadedHandler = null;
elementLoadedHandler = delegate
{
element.Loaded -= elementLoadedHandler;
if (viewModelToBind != null)
{
element.DataContext = viewModelToBind;
}
// Enable navigation for the viewmodel
// Raise navigated to
NavigableViewModelBase navigableViewModel = element.DataContext as NavigableViewModelBase; // ViewModel may be sent by the view and viewModelToBind == true
if (navigableViewModel != null)
{
NavigationServiceFrame navigationService = new NavigationServiceFrame(navigableViewModel, _frame);
navigableViewModel.EnableNavigation(navigationService);
navigableViewModel.RaiseNavigatedTo(e);
}
};
element.Loaded += elementLoadedHandler;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="NavigationServiceFrame"/> class.
/// </summary>
/// <param name="navigableViewModel">The navigator view model.</param>
/// <param name="frame">The navigation service.</param>
internal NavigationServiceFrame(NavigableViewModelBase navigableViewModel, Frame frame)
{
_navigableViewModel = navigableViewModel;
_frame = frame;
}