public ReviewViewModel()
{
ItemsLoading = BackgroundTaskDescriptor <ReviewViewModel <T>, IEnumerable <T> >
.RegisterDescriptor(this, "Ładowanie danych", GetItems)
.OnCompleted((vm, res) => { vm.Items = res; });
ItemsLoading.Invoke();
}
public async void LoadItems()
{
ItemsLoading?.Invoke();
await _apiClient.GetCategories().Process(
categories => _items = categories,
error => Toast.MakeText(_context, error as string, ToastLength.Long).Show()
);
NotifyDataSetChanged();
ItemsLoaded?.Invoke();
}
public async void LoadItems(long cityId, int?page = null)
{
ItemsLoading?.Invoke();
await _apiClient.GetCityPlaces(1, page : page).Process(
places =>
{
_images = new string[places.Length];
Parallel.ForEach(places, async(place, _, index)
=> _images[index] = await ImageStorage.StoreImage("places", place.Id, place.PhotoUrl)
);
_items = places;
},
error => Toast.MakeText(_context, error as string, ToastLength.Long).Show()
);
NotifyDataSetChanged();
ItemsLoaded?.Invoke();
}
public MetadataViewModel()
{
ItemsLoading = BackgroundTaskDescriptor <MetadataViewModel <TItem, TEditItem>, IEnumerable <TItem> >
.RegisterDescriptor(this, GetLoadingItemsText(), GetItems)
.OnCompleted((vm, res) => { vm.Items = new ObservableCollection <TItem>(res); });
EditItemLoading = BackgroundTaskDescriptor <MetadataViewModel <TItem, TEditItem>, TEditItem>
.RegisterDescriptor(this, GetLoadingEditItemText(), GetEditItem, Await)
.OnCompleted((vm, res) =>
{
vm.EditItem = null;
vm.EditItem = res;
});
CreateItemLoading = BackgroundTaskDescriptor <MetadataViewModel <TItem, TEditItem>, TEditItem>
.RegisterDescriptor(this, GetLoadingEditItemText(), CreateNewItem, Await)
.OnCompleted((vm, res) =>
{
vm.EditItem = null;
vm.EditItem = res;
});
ItemsLoading.Invoke();
}