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;
}
public void Add(Area area)
{
var newAreaVM = new AreaViewModel(area, vm);
vm.Favorites.Add(newAreaVM);
// Now we need to notify the UI about the new values.
newAreaVM.NotifyAllPropertiesChanged();
}
// Parameter: currently selected favorite (vm)
public async override void Execute(object parameter)
{
// Update the currently selected favorite based on the current
// zoom window.
AreaViewModel selectedVM = (AreaViewModel)parameter;
if (selectedVM != null)
{
selectedVM.UpdateModel(vm.CurrentArea);
}
else
{
var m = new Windows.UI.Popups.MessageDialog("Select the favorite to update first...");
await m.ShowAsync();
}
}