public virtual void GoForward()
{
if (!CrystalApplication.GetCurrentAsCrystalApplication().Options.HandleForwardNavigationStack)
{
throw new InvalidOperationException("HandleForwardNavigationStack is set to false.");
}
}
internal NavigationManager(CrystalApplication appInstance)
{
if (appInstance == null)
{
throw new ArgumentNullException("appInstance");
}
AppInstance = appInstance;
}
private void NavigationFrame_Navigated(object sender, NavigationEventArgs e)
{
if (e.NavigationMode == NavigationMode.Back)
{
//so the following line (view in git history) seems to point out a possible bug. when using inline navigation, the inline-page's datacontext reverts to the datacontext of the frame's parent.
//... mo-code, mo-problems - we create a new instance to solve that problem.
//TODO implement event/hook for injecting cached viewmodels
//ViewModelBase lastViewModel = default(ViewModelBase);
if (lastViewModel != null)
{
lastViewModel.OnNavigatedFrom(sender, new CrystalNavigationEventArgs(e)
{
Direction = ConvertToCrystalNavDirections(e.NavigationMode)
});
if (CrystalApplication.GetCurrentAsCrystalApplication().Options.HandleForwardNavigationStack)
{
viewModelForwardStack.Push(lastViewModel);
}
}
if (viewModelBackStack.Count > 0)
{
var viewModel = viewModelBackStack.Pop();
InvokePreNavigatedEvent(new NavigationServicePreNavigatedSignaledEventArgs(viewModel, new CrystalNavigationEventArgs(e)));
if (viewModel == null)
{
throw new Exception();
}
((Page)e.Content).DataContext = viewModel;
viewModel.OnNavigatedTo(this, new CrystalNavigationEventArgs(e)
{
Direction = ConvertToCrystalNavDirections(e.NavigationMode)
});
lastViewModel = viewModel;
}
else
{
HandleTerminationReload(e);
}
InvokeNavigatedEvent(new CrystalNavigationEventArgs(e)
{
Direction = ConvertToCrystalNavDirections(e.NavigationMode)
});
navigationLock.Set();
}
}
