static void CreateAndRaiseNewEventArgs(object sender, ViewModelEventRoutedEventArgs e)
{
var v = sender as View;
var target = GetTarget(v);
var new_e2 = new ViewModelEventRoutedEventArgs(e.ViewModelEventArgs, e.RoutedEvent, e.Source);
target.RaiseEvent(new_e2);
if (new_e2.Handled)
e.Handled = true;
}
void View_ViewModelMessage(object sender, ViewModelEventRoutedEventArgs args)
{
OnViewModelEventInternal(args);
}
void OnViewModelEventInternal(ViewModelEventRoutedEventArgs args)
{
if (ViewModel == null)
return;
if (args.RoutedEvent.RoutingStrategy == RoutingStrategy.Bubble)
{
// todo: update interface
(ViewModel as ViewModel).OnPreviewViewModelEventInternal(args.ViewModelEventArgs);
return;
}
if (args.RoutedEvent.RoutingStrategy == RoutingStrategy.Tunnel)
{
// todo: update interface
(ViewModel as ViewModel).OnViewModelEventInternal(args.ViewModelEventArgs);
return;
}
}
void RaiseViewModelEvent(IViewModel vm, IViewModelEvent ev, ViewModelEventRoutingStrategy routingStrategy)
{
if (routingStrategy.HasFlag(ViewModelEventRoutingStrategy.Bubble))
{
var preview_args = new ViewModelEventArgs(vm, ev, ViewModelEventRoutingStrategy.Bubble);
// Raise Bubbling WPF Routed Event
var wpf_preview_args = new ViewModelEventRoutedEventArgs(preview_args, PreviewViewModelEventProperty, this);
RaiseEvent(wpf_preview_args);
if (wpf_preview_args.Handled || preview_args.IsHandled)
return;
}
if (routingStrategy.HasFlag(ViewModelEventRoutingStrategy.Tunnel))
{
var args = new ViewModelEventArgs(vm, ev, ViewModelEventRoutingStrategy.Tunnel);
// Raise Tunneling WPF Routed Event
var wpf_args = new ViewModelEventRoutedEventArgs(args, ViewModelEventProperty, this);
RaiseEvent(wpf_args);
if (wpf_args.Handled || args.IsHandled)
return;
}
if(routingStrategy.HasFlag(ViewModelEventRoutingStrategy.BroadcastToChildren))
{
// search visual tree for children deriving from View
var children =
this.VisualTreeTraversal(
includeChildItemsControls: true,
traversalMode: TreeTraversalMode.BreadthFirst)
.OfType<View>();
var args = new ViewModelEventArgs(vm, ev, ViewModelEventRoutingStrategy.BroadcastToChildren);
foreach (var v in children)
{
v.OnViewModelEventInternal(args);
if (args.IsHandled)
return;
}
}
}
static void Source_ViewModelEvent(object sender, ViewModelEventRoutedEventArgs e)
{
CreateAndRaiseNewEventArgs(sender, e);
}
