internal protected virtual void OnViewModelEventInternal(ViewModelEventArgs args)
{
OnViewModelEvent(args);
if (args.IsHandled)
return;
if (ViewModel != null)
{
// todo: update interface
(ViewModel as ViewModel).OnViewModelEventInternal(args);
}
}
protected virtual void OnViewModelEvent(ViewModelEventArgs args)
{ }
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;
}
}
}
public ViewModelEventRoutedEventArgs(ViewModelEventArgs args, RoutedEvent routedEvent, object source)
: base(routedEvent, source)
{
this.ViewModelEventArgs = args;
}
protected override void OnViewModelEvent(ViewModelEventArgs args)
{
base.OnViewModelEvent(args);
if(args.RoutingStrategy == ViewModelEventRoutingStrategy.Tunnel)
{
if (!HandleTunnelEvents)
return;
Messages =
"{0}: RECEIVED Tunnel Event {1}"
.FormatWith(GetNextMessageNumber(), args.Event.Name)
+ Environment.NewLine
+ Messages;
}
if (args.RoutingStrategy == ViewModelEventRoutingStrategy.BroadcastToChildren)
{
if (!HandleTunnelEvents)
return;
Messages =
"{0}: RECEIVED Broadcast To Children Event {1}"
.FormatWith(GetNextMessageNumber(), args.Event.Name)
+ Environment.NewLine
+ Messages;
}
}
protected override void OnPreviewViewModelEvent(ViewModelEventArgs args)
{
base.OnPreviewViewModelEvent(args);
if (!HandleBubbleEvents)
return;
Messages =
"{0}: RECEIVED Bubble Event {1}"
.FormatWith(GetNextMessageNumber(), args.Event.Name)
+ Environment.NewLine
+ Messages;
}
