protected virtual bool TryRestoreInternal(IDataContext context)
{
IDictionary <string, object> dictionary;
var items = GetItems(out dictionary);
if (items == null || items.Count == 0)
{
return(false);
}
foreach (var item in items.OrderBy(tuple => tuple.Index))
{
dictionary.Remove(NumberPrefix + item.Id);
dictionary.Remove(StatePrefix + item.Id);
if (item.State != null)
{
using (var ms = new MemoryStream(item.State))
{
var dataContext = (IDataContext)_serializer.Deserialize(ms);
var viewModel = _viewModelProvider.RestoreViewModel(dataContext, context, true);
viewModel.ShowAsync(context);
}
}
}
return(true);
}
private static void OnViewModelRestored(IViewModelProvider sender, ViewModelRestoredEventArgs args)
{
var mainViewModel = args.ViewModel as MainViewModel;
if (mainViewModel != null)
{
var context = args.State.GetData(SelectedItemState);
if (context != null)
{
mainViewModel.SelectedItem = sender.RestoreViewModel(context, DataContext.Empty, false);
}
}
}
protected virtual void RestoreViewModel([NotNull] Type viewModelType, [NotNull] IDataContext viewModelState, [NotNull] FrameworkElement element,
[NotNull] IDictionary <string, object> state, [NotNull] object args, [NotNull] IDataContext context)
{
context = context.ToNonReadOnly();
context.AddOrUpdate(InitializationConstants.ViewModelType, viewModelType);
#if WINDOWSCOMMON
context.Add(DynamicViewModelWindowPresenter.RestoredViewConstant, element);
context.Add(DynamicViewModelWindowPresenter.IsOpenViewConstant, true);
#endif
IViewModel viewModel = _viewModelProvider.RestoreViewModel(viewModelState, context, false);
_viewManager.InitializeViewAsync(viewModel, element, context).WithTaskExceptionHandler(this);
_viewModelPresenter.Restore(viewModel, context);
}
protected virtual void RestoreViewModel([NotNull] Type viewModelType, [NotNull] IDataContext viewModelState, [NotNull] FrameworkElement element,
[NotNull] IDictionary <string, object> state, [NotNull] object args, [NotNull] IDataContext context)
{
context = context.ToNonReadOnly();
context.AddOrUpdate(InitializationConstants.ViewModelType, viewModelType);
#if WINDOWS_UWP
context.Add(WindowPresenterConstants.RestoredView, element);
context.Add(WindowPresenterConstants.IsViewOpened, true);
#endif
IViewModel viewModel = _viewModelProvider.RestoreViewModel(viewModelState, context, true);
context.AddOrUpdate(NavigationConstants.ViewModel, viewModel);
_viewManager.InitializeViewAsync(viewModel, element, context);
_viewModelPresenter.Restore(context);
}
protected virtual void RestoreViewModel([NotNull] Type viewModelType, [NotNull] IDataContext viewModelState, [NotNull] NSObject item, [NotNull] NSCoder coder,
[NotNull] IDataContext context)
{
context = context.ToNonReadOnly();
context.AddOrUpdate(InitializationConstants.ViewModelType, viewModelType);
if (item is IModalView)
{
context.Add(DynamicViewModelWindowPresenter.RestoredViewConstant, item);
context.Add(DynamicViewModelWindowPresenter.IsOpenViewConstant, true);
}
var viewModel = _viewModelProvider.RestoreViewModel(viewModelState, context, false);
_viewManager.InitializeViewAsync(viewModel, item, context).WithTaskExceptionHandler(this);
_viewModelPresenter.Restore(viewModel, context);
}
protected virtual void RestoreViewModel([NotNull] Type viewModelType, [NotNull] IDataContext viewModelState, [NotNull] NSObject item, [NotNull] NSCoder coder,
[NotNull] IDataContext context)
{
context = context.ToNonReadOnly();
context.AddOrUpdate(InitializationConstants.ViewModelType, viewModelType);
if (item is IModalView)
{
context.Add(WindowPresenterConstants.RestoredView, item);
context.Add(WindowPresenterConstants.IsViewOpened, true);
}
var viewModel = _viewModelProvider.RestoreViewModel(viewModelState, context, true);
context.AddOrUpdate(NavigationConstants.ViewModel, viewModel);
_viewManager.InitializeViewAsync(viewModel, item, context);
_viewModelPresenter.Restore(context);
}
/// <summary>
/// Occurs on load element state.
/// </summary>
public virtual void OnLoadState(FrameworkElement element, IDictionary <string, object> state, object args,
IDataContext context = null)
{
Should.NotBeNull(element, "element");
Should.NotBeNull(state, "state");
object value;
if (!state.TryGetValue(VmStateKey, out value))
{
return;
}
state.Remove(VmStateKey);
var container = (LazySerializableContainer)value;
if (container == null)
{
return;
}
object dataContext = element.DataContext;
Type vmType = Type.GetType(container.ViewModelType, false);
if (vmType == null || (dataContext != null && dataContext.GetType().Equals(vmType)))
{
return;
}
context = context.ToNonReadOnly();
context.AddOrUpdate(InitializationConstants.ViewModelType, vmType);
//The navigation is already handled.
var eventArgs = args as NavigationEventArgs;
if (eventArgs != null && eventArgs.GetHandled())
{
eventArgs.SetHandled(false);
PlatformExtensions.SetViewModelState(eventArgs.Content, container.GetContext(_serializer));
}
else
{
IViewModel viewModel = _viewModelProvider.RestoreViewModel(container.GetContext(_serializer), context, false);
_viewManager.InitializeViewAsync(viewModel, element).WithTaskExceptionHandler(this);
_viewModelPresenter.Restore(viewModel, context);
}
}
private void RestoreState(NSObject item, NSCoder coder)
{
RestoreNavigationParameter(item, coder);
if (!coder.ContainsKey(VmStateKey) || !coder.ContainsKey(VmTypeKey))
{
return;
}
var vmTypeName = (NSString)coder.DecodeObject(VmTypeKey);
if (vmTypeName == null)
{
return;
}
object dataContext = Infrastructure.ViewManager.GetDataContext(item);
var vmType = Type.GetType(vmTypeName, false);
if (vmType == null || (dataContext != null && dataContext.GetType().Equals(vmType)))
{
return;
}
byte[] bytes = coder.DecodeBytes(VmStateKey);
IDataContext state;
using (var ms = new MemoryStream(bytes))
state = (IDataContext)_serializer.Deserialize(ms);
var context = new DataContext
{
{ InitializationConstants.ViewModelType, vmType }
};
if (item is IModalView)
{
context.Add(DynamicViewModelWindowPresenter.RestoredViewConstant, item);
context.Add(DynamicViewModelWindowPresenter.IsOpenViewConstant, true);
}
var viewModel = _viewModelProvider.RestoreViewModel(state, context, false);
_viewManager.InitializeViewAsync(viewModel, item);
_viewModelPresenter.Restore(viewModel, context);
}
