protected virtual void PreserveViewModel([NotNull] IViewModel viewModel, NSObject item, [NotNull] NSCoder coder, [NotNull] IDataContext context)
{
var state = _viewModelProvider.PreserveViewModel(viewModel, context);
using (var stream = _serializer.Serialize(state))
coder.Encode(stream.ToArray(), VmStateKey);
}
private static void OnViewModelPreserved(IViewModelProvider sender, ViewModelPreservedEventArgs args)
{
var mainViewModel = args.ViewModel as MainViewModel;
if (mainViewModel?.SelectedItem != null)
{
args.State.AddOrUpdate(SelectedItemState, sender.PreserveViewModel(mainViewModel.SelectedItem, DataContext.Empty));
}
}
/// <summary>
/// Occurs on save element state.
/// </summary>
public virtual void OnSaveState(FrameworkElement element, IDictionary <string, object> state, object args,
IDataContext context = null)
{
Should.NotBeNull(element, "element");
Should.NotBeNull(state, "state");
var viewModel = element.DataContext as IViewModel;
if (viewModel != null)
{
state[VmStateKey] = new LazySerializableContainer(_serializer,
_viewModelProvider.PreserveViewModel(viewModel, context ?? DataContext.Empty), viewModel);
}
}
protected virtual void SaveStateInternal([NotNull] IDataContext context)
{
var dictionary = GetStateDictionary?.Invoke();
var viewModels = _openedViewModels.ToArray();
if (viewModels.Length == 0 || dictionary == null)
{
return;
}
for (var i = 0; i < viewModels.Length; i++)
{
var viewModel = viewModels[i];
var vmId = viewModel.GetViewModelId().ToString("n");
var state = _serializer.Serialize(_viewModelProvider.PreserveViewModel(viewModel, context)).ToArray();
dictionary[NumberPrefix + vmId] = i;
dictionary[StatePrefix + vmId] = state;
}
}
private void SaveState(NSObject item, IViewModel viewModel, NSCoder coder)
{
object navigationParameter = (item as UIViewController).GetNavigationParameter();
if (navigationParameter != null)
{
using (Stream stream = _serializer.Serialize(navigationParameter))
coder.Encode(stream.ToArray(), ParameterStateKey);
}
if (viewModel == null)
{
return;
}
coder.Encode(new NSString(viewModel.GetType().AssemblyQualifiedName), VmTypeKey);
var state = _viewModelProvider.PreserveViewModel(viewModel, DataContext.Empty);
using (var stream = _serializer.Serialize(state))
coder.Encode(stream.ToArray(), VmStateKey);
}
protected virtual void PreserveViewModel([NotNull] IViewModel viewModel, [NotNull] FrameworkElement element,
[NotNull] IDictionary <string, object> state, [NotNull] object args, [NotNull] IDataContext context)
{
state[VmStateKey] = new LazySerializableContainer(_serializer, _viewModelProvider.PreserveViewModel(viewModel, context));
}
