private static IMvxViewModel LoadViewModel(this IMvxFragmentView fragmentView, IMvxBundle savedState,
MvxViewModelRequest request = null)
{
var viewModelType = fragmentView.FindAssociatedViewModelTypeOrNull();
if (viewModelType == typeof(MvxNullViewModel))
{
return(new MvxNullViewModel());
}
if (viewModelType == null ||
viewModelType == typeof(IMvxViewModel))
{
MvxTrace.Trace("No ViewModel class specified for {0} in LoadViewModel",
fragmentView.GetType().Name);
}
if (request == null)
{
request = MvxViewModelRequest.GetDefaultRequest(viewModelType);
}
var loaderService = Mvx.Resolve <IMvxViewModelLoader>();
var viewModel = loaderService.LoadViewModel(request, savedState);
return(viewModel);
}
public static void OnCreate(this IMvxFragmentView fragmentView, IMvxBundle bundle, MvxViewModelRequest request = null)
{
if (fragmentView.ViewModel != null)
{
Mvx.Trace("Fragment {0} already has a ViewModel, skipping ViewModel rehydration",
fragmentView.GetType().ToString());
return;
}
var view = fragmentView as IMvxView;
var viewModelType = fragmentView.FindAssociatedViewModelTypeOrNull();
var cache = Mvx.Resolve <IMvxMultipleViewModelCache>();
var cached = cache.GetAndClear(viewModelType);
view.OnViewCreate(() => cached ?? LoadViewModel(fragmentView, bundle, request));
}
public static void OnCreate(this IMvxFragmentView fragmentView, IMvxBundle bundle, MvxViewModelRequest request = null)
{
if (fragmentView.ViewModel != null)
{
//TODO call MvxViewModelLoader.Reload when it's added in MvvmCross, tracked by #1165
//until then, we're going to re-run the viewmodel lifecycle here.
RunViewModelLifecycle(fragmentView.ViewModel, bundle, request);
return;
}
var view = fragmentView as IMvxView;
var viewModelType = fragmentView.FindAssociatedViewModelTypeOrNull();
var cache = Mvx.Resolve <IMvxMultipleViewModelCache>();
var cached = cache.GetAndClear(viewModelType);
view.OnViewCreate(() => cached ?? LoadViewModel(fragmentView, bundle, request));
}
public static Type FindAssociatedViewModelType(this IMvxFragmentView fragmentView, Type fragmentActivityParentType)
{
var viewModelType = fragmentView.FindAssociatedViewModelTypeOrNull();
var type = fragmentView.GetType();
if (viewModelType == null)
{
if (!type.HasMvxFragmentAttribute())
{
throw new InvalidOperationException($"Your fragment is not generic and it does not have {nameof(MvxFragmentAttribute)} attribute set!");
}
var cacheableFragmentAttribute = type.GetMvxFragmentAttribute(fragmentActivityParentType);
if (cacheableFragmentAttribute.ViewModelType == null)
{
throw new InvalidOperationException($"Your fragment is not generic and it does not use {nameof(MvxFragmentAttribute)} with ViewModel Type constructor.");
}
viewModelType = cacheableFragmentAttribute.ViewModelType;
}
return(viewModelType);
}
