public MainViewerViewModel(MainViewer viewer)
{
// Add starting area to the list of favorites
Favorites = new ObservableCollection <AreaViewModel>();
var startingAreaVm = new AreaViewModel(StartingArea.Clone(), this);
Favorites.Add(startingAreaVm);
startingAreaVm.NotifyAllPropertiesChanged();
// Create remaining parts of view model
AddToFavoritesCommand = new AddToFavoritesCommand(this);
UpdateFavoriteCommand = new UpdateFavoriteCommand(this);
RerenderImageCommand = new RerenderImageCommand(this);
SaveFavoritesCommand = new SaveFavoritesCommand(this);
// EVIP: ICommand which needs an Action<> to be set, so it can use it during its execution.
// Note: We need to provide the method to add an Area to the favorites list.
// Example for providing an action (to invoke for all loaded elements) as a constructor parameter
// of type Action<Area>.
AddFavoritesFromFileCommand = new AddFavoritesFromFileCommand(this, AddToFavoritesCommand.Add);
// EVIP: Cloning to avoid manipulation of
// the same instance from many points.
CurrentArea = StartingArea.Clone();
// Note: After cloning, we need to subscribe to the event of the new instance.
CurrentArea.PropertyChanged += CurrentArea_PropertyChanged;
}
protected override async void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
if (e.Parameter != null)
{
string arg = e.Parameter.ToString();
switch (arg)
{
case "view-alerts":
GotoAlertsPage();
break;
default:
break;
}
}
LocationData LocParameter = e.Parameter as LocationData;
if (e.NavigationMode == NavigationMode.New)
{
// Reset loader if new page instance created
location = null;
wLoader = null;
MainViewer.ChangeView(null, 0, null);
// New page instance created, so restore
if (LocParameter != null)
{
location = LocParameter;
wLoader = new WeatherDataLoader(location, this, this);
}
await Restore();
}
else
{
LocationData homeData = Settings.HomeData;
// Did home change?
bool homeChanged = false;
if (location != null && Frame.BackStack.Count == 0)
{
if (!location.Equals(homeData))
{
location = homeData;
homeChanged = true;
}
}
if (wLoader != null)
{
var userlang = GlobalizationPreferences.Languages.First();
var culture = new CultureInfo(userlang);
var locale = wm.LocaleToLangCode(culture.TwoLetterISOLanguageName, culture.Name);
// Reset loader if source, query or locale is different
bool resetLoader = WeatherView.WeatherSource != Settings.API || homeChanged;
if (wm.SupportsWeatherLocale && !resetLoader)
{
resetLoader = WeatherView.WeatherLocale != locale;
}
if (resetLoader)
{
wLoader = null;
}
}
// Update view on resume
// ex. If temperature unit changed
if ((wLoader != null) && !homeChanged)
{
await Resume();
if (location.query == homeData.query)
{
// Clear backstack since we're home
Frame.BackStack.Clear();
SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Collapsed;
}
}
else
{
await Restore();
}
}
}
public SettingsForm(MainViewer parent)
{
InitializeComponent();
AlertCheckBox.Checked = Settings.EndBeginAlerts;
this.parent = parent;
}
