protected virtual void OnBeforeNewViewModelAdded(object newDataContext, IHostAwareViewModel newViewModel)
{
}
void OnBeforeNewViewModelAddedInternal(object newDataContext, IHostAwareViewModel newViewModel)
{
if(newViewModel != null)
{
if (SUBSCRIPTION_AfterViewModelRaised != null)
SUBSCRIPTION_AfterViewModelRaised.Dispose();
SUBSCRIPTION_AfterViewModelRaised =
(newViewModel as ViewModel) // todo: update IViewModel interface
.CreateWeakEventHandler()
.ForEvent<AfterViewModelEventRaisedArgs>(
(vm, h) => vm.AfterViewModelEventRaised += h,
(vm, h) => vm.AfterViewModelEventRaised -= h)
.Subscribe((vm, args) => OnAfterViewModelEventRaised(vm as ViewModel, args.Event, args.RoutingStrategy));
if (SUBSCRIPTION_FindDataContextInVisualTree != null)
SUBSCRIPTION_FindDataContextInVisualTree.Dispose();
SUBSCRIPTION_FindDataContextInVisualTree =
(newViewModel as ViewModel)
.CreateWeakEventHandler()
.ForEvent<SquaredInfinity.Foundation.Presentation.ViewModels.ViewModel.FindDataContextInVisualTreeEventArgs>(
(vm, h) => vm.TryFindDataContext += h,
(vm, h) => vm.TryFindDataContext -= h)
.Subscribe((_s, _e) =>
{
var vp = this.GetVisualOrLogicalParent();
while(vp != null)
{
var fe = vp as FrameworkElement;
if(fe != null)
{
var dx = fe.DataContext;
if(dx != null)
{
var result = (object) null;
if(dx.TryConvert(_e.DataContextType, out result))
{
_e.DataContext = result;
_e.Handle();
return;
}
}
// if fe is a View, try to convert view model to desired type
var v = fe as View;
if(v != null)
{
var vm = v.ViewModel;
if(vm != null)
{
var result = (object)null;
if(vm.TryConvert(_e.DataContextType, out result))
{
_e.DataContext = result;
_e.Handle();
return;
}
}
}
}
vp = vp.GetVisualOrLogicalParent();
}
});
}
OnBeforeNewViewModelAdded(newDataContext, newViewModel);
}
protected virtual void OnBeforeOldViewModelRemoved(object oldDataContext, IHostAwareViewModel oldViewModel)
{ }
void OnBeforeNewViewModelAddedInternal(object newDataContext, IHostAwareViewModel newViewModel)
{
if (newViewModel != null)
{
AfterViewModelRaisedSubscription =
(newViewModel as ViewModel) // todo: update IViewModel interface
.CreateWeakEventHandler()
.ForEvent<AfterViewModelEventRaisedArgs>(
(vm, h) => vm.AfterViewModelEventRaised += h,
(vm, h) => vm.AfterViewModelEventRaised -= h)
.Subscribe((vm, args) => OnAfterViewModelEventRaised(vm as ViewModel, args.Event, args.RoutingStrategy));
}
OnBeforeNewViewModelAdded(newDataContext, newViewModel);
}
void viewModel_modalInteractionCompleting(IHostAwareViewModel hostAwareViewModel)
{
// unsubscribe view model from this event (to prevent memory leak)
hostAwareViewModel.InteractionCompleting -= viewModel_modalInteractionCompleting;
// set dialog result on window
Window window = hostAwareViewModel.ViewModelHost as Window;
if (window != null && window.DialogResult == null)
{
switch (hostAwareViewModel.InteractionOutcome)
{
case UserInteractionOutcome.Cancelled:
window.DialogResult = false;
break;
case UserInteractionOutcome.OtherSuccess:
window.DialogResult = true;
break;
default:
window.DialogResult = false;
break;
}
}
}
void viewModel_nonModalInteractionCompleting(IHostAwareViewModel hostAwareViewModel)
{
// unsubscribe view model from this event (to prevent memory leak)
hostAwareViewModel.InteractionCompleting -= viewModel_nonModalInteractionCompleting;
// set dialog result on window
Window window = hostAwareViewModel.ViewModelHost as Window;
if (window != null)
{
window.Close();
}
}
