public static TViewModel Get <TViewModel>(
[NotNull] IViewModelStoreOwner owner,
[NotNull] string key,
[CanBeNull] IBundle stateBundle)
where TViewModel : class, IViewModel, IViewModelWithState
{
if (owner == null)
{
throw new ArgumentNullException(nameof(owner));
}
if (key == null)
{
throw new ArgumentNullException(nameof(key));
}
if (string.IsNullOrWhiteSpace(key))
{
throw new ArgumentException("Value cannot be null or whitespace.", nameof(key));
}
var store = owner.GetViewModelStore();
var viewModel = store.Get <TViewModel>(key);
if (viewModel == null)
{
viewModel = Get <TViewModel>(GetFactory(), stateBundle);
store.Set <TViewModel>(key, viewModel);
}
return(viewModel);
}
internal static ViewModelStore GetViewModelStore([NotNull] this IViewModelStoreOwner owner)
{
var fragmentManager = owner.GetFragmentManager();
var store = (ViewModelStore)fragmentManager.FindFragmentByTag(ViewModelStoreTag);
if (store == null)
{
store = new ViewModelStore();
var fragmentTransaction = fragmentManager
.BeginTransaction().NotNull()
.Add(store, ViewModelStoreTag).NotNull();
if (Build.VERSION.SdkInt >= BuildVersionCodes.N)
{
fragmentTransaction.CommitNow();
}
else
{
fragmentTransaction.Commit();
fragmentManager.ExecutePendingTransactions();
}
}
return(store);
}
