private void UpdateNavigationContext(IOperationCallback callback, IViewModel navigationViewModel, NavigationEventArgsBase args, ref INavigationContext context)
{
var vmType = context.GetData(ViewModelType);
if (vmType == null)
{
return;
}
var viewModel = GetViewModelForView(args, navigationViewModel, context, vmType);
if (!ReferenceEquals(context.ViewModelTo, viewModel))
{
context = new NavigationContext(context.NavigationMode, context.ViewModelFrom, viewModel,
context.NavigationProvider, context.Parameters);
}
if (viewModel != null && callback != null)
{
RegisterOperationCallback(viewModel, callback, context);
}
}
private void OnSelectedItemChangedInternal(IViewModel oldValue, IViewModel newValue)
{
ISelectable selectable;
INavigableViewModel navigableViewModel;
NavigationContext ctx = null;
if (ItemsSource.Contains(oldValue))
{
selectable = oldValue as ISelectable;
if (selectable != null)
selectable.IsSelected = false;
navigableViewModel = oldValue as INavigableViewModel;
if (navigableViewModel != null)
{
ctx = new NavigationContext(NavigationType.Tab, NavigationMode.Refresh, oldValue, newValue, this);
navigableViewModel.OnNavigatedFrom(ctx);
}
}
selectable = newValue as ISelectable;
if (selectable != null)
selectable.IsSelected = true;
navigableViewModel = newValue as INavigableViewModel;
if (navigableViewModel != null)
navigableViewModel.OnNavigatedTo(ctx ??
new NavigationContext(NavigationType.Tab, NavigationMode.Refresh, oldValue, newValue, this));
OnSelectedItemChanged(oldValue, newValue);
if (SelectedItemChanged == null)
return;
var args = new SelectedItemChangedEventArgs<IViewModel>(oldValue, newValue);
ThreadManager.Invoke(Settings.EventExecutionMode, this, args, (model, eventArgs) =>
{
model.SelectedItemChanged?.Invoke(model, eventArgs);
});
}
protected virtual void MultiViewModelOnViewModelClosed(object sender, ValueEventArgs<IViewModel> args)
{
var context = new NavigationContext(NavigationType.Tab, NavigationMode.Back, args.Value,
MultiViewModel.SelectedItem, MultiViewModel);
bool? result = null;
var hasOperationResult = args.Value as IHasOperationResult;
if (hasOperationResult != null)
result = hasOperationResult.OperationResult;
CallbackManager.SetResult(args.Value, OperationResult.CreateResult(OperationType.TabNavigation, args.Value, result, context));
}
private void ClearCacheIfNeed(IDataContext context, IViewModel viewModelTo)
{
if (!context.GetData(ClearNavigationCache) || CachePolicy == null)
return;
var viewModels = CachePolicy.Invalidate(context);
foreach (var viewModelFrom in viewModels.Reverse())
{
var navigationContext = new NavigationContext(NavigationType.Page, NavigationMode.Reset, viewModelFrom, viewModelTo, this);
if (!OnViewModelClosed(viewModelFrom, navigationContext, this, true))
CompleteOperationCallback(viewModelFrom, navigationContext);
}
}
private void UpdateNavigationContext(IOperationCallback callback, IViewModel navigationViewModel, NavigationEventArgsBase args, ref INavigationContext context)
{
var vmType = context.GetData(ViewModelTypeConstant);
if (vmType == null)
return;
var viewModel = GetViewModelForView(args, navigationViewModel, context, vmType);
if (!ReferenceEquals(context.ViewModelTo, viewModel))
context = new NavigationContext(NavigationType.Page, context.NavigationMode, context.ViewModelFrom, viewModel, context.NavigationProvider);
if (viewModel != null && callback != null)
RegisterOperationCallback(viewModel, callback, context);
}
/// <summary>
/// Raised after the view model navigation.
/// </summary>
/// <param name="viewModel">The specified view model.</param>
/// <param name="mode">The specified navigation mode.</param>
/// <param name="context">The specified <see cref="IDataContext" />.</param>
public virtual void OnNavigated(IViewModel viewModel, NavigationMode mode, IDataContext context)
{
Should.NotBeNull(viewModel, "viewModel");
var navigationContext = new NavigationContext(NavigationType.Page, mode, CurrentViewModel, viewModel, this);
var currentViewModel = CurrentViewModel;
if (currentViewModel != null)
TryCacheViewModel(navigationContext, CurrentContent ?? currentViewModel.Settings.Metadata.GetData(ViewModelConstants.View), currentViewModel);
OnNavigated(navigationContext);
}
protected virtual void MultiViewModelOnViewModelClosed(object sender, ValueEventArgs<IViewModel> args)
{
var context = new NavigationContext(NavigationType.Tab, NavigationMode.Back, args.Value,
MultiViewModel.SelectedItem, MultiViewModel);
var result = ViewModelExtensions.GetOperationResult(args.Value);
CallbackManager.SetResult(OperationResult.CreateResult(OperationType.TabNavigation, args.Value, result, context));
}