private async Task <bool> NavigateTo(Type type, object param, bool push)
{
// Do we already have a ViewModel? If so we check if we can navigate await.
// This logic is there to add the possibility of blocking navigation if data is dirty.
if (_current != null)
{
if (!_current.BeforeNavigationAway())
{
return(false);
}
}
IViewModel vm = null;
var oldView = _currentView;
// Create an instance of the object type passed in the navigation.
//var vobj = _mvvmConfiguration.IoC.Resolve(type);
if (typeof(IView).IsAssignableFrom(type) && !IgnoreView)
{
// if it's a View, we get the corresponding ViewModel.
_currentView = _mvvmConfiguration.IoC.Resolve(type) as IView;
vm = GetViewModelForView(_currentView);
}
else
{
// It was a ViewModel, let's get the corresponding View.
vm = (IViewModel)_mvvmConfiguration.IoC.Resolve(type);
if (!IgnoreView)
{
_currentView = GetViewFromViewModel(vm);
}
}
if (vm == null || (_currentView == null && !IgnoreView))
{
throw new ArgumentException("Type is not a navigation type for this framework");
}
// We set the ViewModel as the DataContext of the View for bindings.
if (!IgnoreView)
{
(_currentView as UserControl).DataContext = vm;
}
// Add Navigator to both
if (!IgnoreView)
{
_currentView.Nav = this;
}
vm.Navigator = this;
// If View has a ModelView property, then set it.
if (!IgnoreView)
{
var prop = _currentView.GetType().GetProperty("ModelView");
if (prop != null)
{
prop.SetValue(_currentView, vm);
}
}
vm.BeforeNavigationTo();
if (_current != null && push)
{
_breadcrumb.Push(_currentStamp);
}
if (_current != null)
{
_current.NavigatedAway();
}
if (oldView != null)
{
oldView.ViewUnloaded();
}
_mvvmConfiguration.SetOnNavigation(_currentView, vm);
if (!await vm.NavigatedTo(param))
{
_currentView = null;
_current = null;
await GoBack();
return(false);
}
if (!IgnoreView)
{
_currentView.ViewLoaded();
}
if (OnCreateStamp != null)
{
OnCreateStamp(_currentStamp);
}
_currentStamp = new NavigationStamp()
{
Param = param, ViewModel = vm.GetType()
};
_current = vm;
//trigger navigation finished event with success value
if (NavigationFinished != null)
{
NavigationFinished(this, true);
}
return(true);
}
