/// <summary>
/// Sets up the view model.
/// </summary>
/// <param name="sender">
/// The source of the event; typically <see cref="Common.NavigationHelper"/>
/// </param>
/// <param name="e">Event data that provides both the navigation parameter passed to
/// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested and
/// a dictionary of state preserved by this page during an earlier
/// session. The state will be null the first time a page is visited.</param>
private void navigationHelper_LoadState(object sender, LoadStateEventArgs e)
{
defaultViewModel = (TripListViewModel)this.DataContext;
DefaultViewModel.SelectedTrip = null;
Window.Current.CoreWindow.VisibilityChanged += CoreWindow_VisibilityChanged;
}
/// <summary>
/// Populates the page with content passed during navigation. Any saved state is also
/// provided when recreating a page from a prior session.
/// Resets the state of the view model by passing in the parameters provided by the
/// caller.
/// </summary>
/// <param name="sender">
/// The source of the event; typically <see cref="Common.NavigationHelper"/>
/// </param>
/// <param name="e">Event data that provides both the navigation parameter passed to
/// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested and
/// a dictionary of state preserved by this page during an earlier
/// session. The state will be null the first time a page is visited.</param>
private void navigationHelper_LoadState(object sender, LoadStateEventArgs e)
{
defaultViewModel = (TripViewModel)this.DataContext;
if (e.NavigationParameter is Trip)
{
// Activated via selecting a trip in the main page's list of trips.
DefaultViewModel.ShowTrip((Trip)e.NavigationParameter);
}
else if (e.NavigationParameter is TripVoiceCommand)
{
// look up destination, set trip.
TripVoiceCommand voiceCommand = (TripVoiceCommand)e.NavigationParameter;
DefaultViewModel.LoadTripFromStore(voiceCommand.destination);
// artificially populate the page backstack so we have something to
// go back to to get to the main page.
PageStackEntry backEntry = new PageStackEntry(typeof(View.TripListView), null, null);
this.Frame.BackStack.Add(backEntry);
}
else if(e.NavigationParameter is string)
{
// We've been URI Activated, possibly by a user clicking on a tile in a Cortana session,
// we should see an argument like destination=<Location>.
// This should handle finding all of the destinations that match, but currently it only
// finds the first one.
string arguments = e.NavigationParameter as string;
if(arguments != null)
{
string[] args = arguments.Split('=');
if (args.Length == 2 && args[0].ToLowerInvariant() == "destination")
{
DefaultViewModel.LoadTripFromStore(args[1]);
// artificially populate the page backstack so we have something to
// go back to to get to the main page.
PageStackEntry backEntry = new PageStackEntry(typeof(View.TripListView), null, null);
this.Frame.BackStack.Add(backEntry);
}
}
}
else
{
DefaultViewModel.NewTrip();
}
}