public void Clear_CallsDisposer()
{
var isDisposeCalled = false;
var sut = new TranslatingObservable <Int32, String>(_source, i => i.ToString(), i => isDisposeCalled = true);
_source.Clear();
Assert.True(isDisposeCalled);
}
public ItemListViewModel(AppState appState)
{
_appState = appState;
// Translate the AppState's ObservableCollection<ToDoItem> into an
// ObservableCollection<ItemViewCellModel> which can then be used to populate a ListView
Items = new TranslatingObservable <ToDoItem, ItemViewCellModel>(appState.Items, item => new ItemViewCellModel(appState, item));
// Convert the AppState's SelectedItem from a ToDoItem to the corresponding ItemViewCellModel
// so it can be bound to a ListView's SelectedItem property (the value needs to match the one
// in the ObservableCollection<ItemViewCellModel> which is backing the ListView).
SelectedItem = Items.GetTranslatedValueOrNull(appState.SelectedItem);
// When the user selects an item in the list, update AppState accordingly
SelectItemCommand = new Command <ItemViewCellModel>(itemViewCellModel =>
{
var selectedItem = itemViewCellModel?.ToDoItem;
appState.SelectItem(selectedItem);
});
// When the AppState's SelectedItem changes, update the ListView selection accordingly
appState.PropertyChanged += OnAppStatePropertyChanged;
}
public TranslatingObservableTests()
{
_source = new ObservableCollection <Int32>(new Int32[] { 1, 2, 3 });
_sut = new TranslatingObservable <Int32, String>(_source, i => i.ToString());
}
