private readonly EventHandler <CancelEventArgs> _backButtonHandler; // Hold onto the delegate so we can unsubscribe during navigation away from the page
/// <summary>Constructor, retrieves a refernce to our ViewModel which has been set via the ViewModelLocator in XAML</summary>
public MainView()
{
try
{
InitializeComponent();
// Get a reference to our view model, which has been set in XAML
ViewModel = this.DataContext as IMainViewModel;
if (ViewModel == null)
{
throw new NullReferenceException();
}
// Hook into the ViewModel's MapRouteChanged event. This allows us to display the
// route (if any) to the RoundUp location point
ViewModel.MapRouteChanged += (sender, args) =>
{
try
{
// Remove any previous route
if (_mapRouteToRoundUpLocation != null)
{
LocationMap.RemoveRoute(_mapRouteToRoundUpLocation);
}
// Save the route...
_mapRouteToRoundUpLocation = args.NewRoute;
// The ViewModel can remove the existing route by raising the MapRouteChanged event and supplying a null NewRoute
if (args.NewRoute == null)
{
return;
}
// ... and add it to the map
LocationMap.AddRoute(_mapRouteToRoundUpLocation);
}
catch (Exception ex)
{
Logger.Log(ex, "Error modifying route. ", new StackFrame(0, true));
}
};
// Hook into the ViewModel's ShareUiVisibilityChanged event. This allows us to start/stop the "sonar" annimation
_sonarTimer = new Timer(SonarWaitOnCompleted, null, -1, -1);
ViewModel.ShareUiVisibilityChanged += (sender, args) =>
{
if (!ViewModel.ShowShareUI)
{
// Close the share panel and stop the sonar animation
_sonarTimer.Change(-1, -1); // Stop the timer
if (_subscribedToStoryboardEvents)
{
StoryboardSonar.Completed -= StoryboardSonarOnCompleted;
}
StoryboardSonar.Stop(); // Stop the sonar animation
ShareUiPanelCloseStoryboard.Begin(); // Close the share panel
return;
}
// Open the share panel and start the sonar animation
StoryboardSonar.Completed += StoryboardSonarOnCompleted;
_subscribedToStoryboardEvents = true;
StoryboardSonar.Begin(); // Start the sonar animation
ShareUiPanelOpenStoryboard.Begin(); // Open the share panel
};
// Hook into the CurrentLocationChanged event so we can update the position of the current location "sonar" animation
ViewModel.CurrentLocationChanged += (sender, args) =>
{
var currentLoc = LocationMap.ConvertGeoCoordinateToViewportPoint(args.Location);
SonarCurrentLocation.Margin = new Thickness(
currentLoc.X - SonarCurrentLocation.Width / 2,
currentLoc.Y - SonarCurrentLocation.Height / 2,
0,
0);
SonarCurrentLocation.Visibility = Visibility.Visible;
Deployment.Current.Dispatcher.BeginInvoke(() => StoryboardCurrentLocation.Begin());
};
StoryboardCurrentLocation.Completed += (sender, args) => { SonarCurrentLocation.Visibility = Visibility.Collapsed; };
// Hook into the InviteeSelected event so we can place a "sonar" animation around the currently selected invitee
ViewModel.InviteeSelected += (sender, args) =>
{
var inviteeLoc = LocationMap.ConvertGeoCoordinateToViewportPoint(args.Location);
SonarSelectedInvitee.Margin = new Thickness(
inviteeLoc.X - SonarSelectedInvitee.Width / 2,
inviteeLoc.Y - SonarSelectedInvitee.Height / 2,
0,
0);
SonarSelectedInvitee.Visibility = Visibility.Visible;
Deployment.Current.Dispatcher.BeginInvoke(() => StoryboardSelectedInvitee.Begin());
};
StoryboardSelectedInvitee.Completed += (sender, args) => { SonarSelectedInvitee.Visibility = Visibility.Collapsed; };
// Pass on the backKeyPress event to the view model
// 9/4/14 changed from using anonymous delegate so we can unsubscribe from the event during OnNavigatedFrom as recommended by MS
//this.BackKeyPress += (sender, args) => ViewModel.BackKeyPress(args);
_backButtonHandler = (sender, args) => ViewModel.BackKeyPress(args);
this.BackKeyPress += _backButtonHandler;
}
catch (Exception ex)
{
Logger.Log(ex, "Fatal exception in MainView ctor. ", new StackFrame(0, true));
}
}