void OnUpdate(object sender, ListModelEventArgs <DataModelType> e)
{
if (CanUpdateList())
{
var itemsFromModel = _model.GetItems().ToList();
//добавляем те элементы, которые были добавленны в процессе редактирования
var addedItems = addedAndDelatedItems.Where(itm => itm.Value == ChangeStatus.Add).Select(itm => itm.Key).ToList();
itemsFromModel.AddRange(addedItems);
//удаляем элементы, которые были удалены, чтобы они не отображались
var deletedItems = addedAndDelatedItems.Where(itm => itm.Value == ChangeStatus.Delete).Select(itm => itm.Key).ToList();
foreach (var delItem in deletedItems)
{
itemsFromModel.Remove(delItem);
}
var newItemViewModels = GetItemViewModels(itemsFromModel);
UpdateList(newItemViewModels);
}
}
public ListViewModel(IListModel <DataModelType> model,
IViewModelCreator <DataModelType, DataViewModelType, DataDetailViewModelType> creator,
IItemModelAdapterCreator <DataModelType> itemModelCreator)
{
if (creator == null)
{
throw new ArgumentNullException("creator can't be null");
}
_creator = creator;
if (itemModelCreator == null)
{
throw new ArgumentNullException("itemModelCreator can't be null");
}
_itemModelCreator = itemModelCreator;
if (model == null)
{
throw new ArgumentNullException("model can't be null");
}
_model = model;
_model.Updated += OnUpdate;
var itemViewModels = GetItemViewModels(_model.GetItems());
UpdateList(itemViewModels);
AddItemCommand = new AddItemCommand <DataModelType, DataViewModelType, DataDetailViewModelType>(this);
DeleteItemCommand = new DeleteItemCommand <DataModelType, DataViewModelType, DataDetailViewModelType>(this);
EditListCommand = new EditListCommand <DataModelType, DataViewModelType, DataDetailViewModelType>(this);
SaveListCommand = new SaveListCommand <DataModelType, DataViewModelType, DataDetailViewModelType>(this);
SelectItemCommand = new SelectItemCommand <DataModelType, DataViewModelType, DataDetailViewModelType>(this);
UpdateListCommand = new UpdateListCommand <DataModelType, DataViewModelType, DataDetailViewModelType>(this);
addedAndDelatedItems = new Dictionary <IItemModelAdapter <DataModelType>, ChangeStatus>();
IsSaved = true;
}
