private void ProcessMultiGlobalCommandInvalidators(IMultiGlobalCommand multiGlobalCommand)
{
multiGlobalCommand.OnCommandsComputed += (oldCommands, newCommands) =>
{
var associatedInvalidationSubscriptions = MultiCommandsSubscriptions.Where(o => oldCommands.Contains(o.Object)).ToList();
foreach (var subscription in associatedInvalidationSubscriptions)
{
subscription.Break();
}
foreach (var command in newCommands)
{
foreach (var metadata in command.Metadata.OfType <IAutoInvalidateMetadata>())
{
var token = metadata.AttachMetadataDefinition(EventAggregator, () => command.RaiseCanExecuteChanged());
MultiCommandsSubscriptions.Add(new Subscription()
{
Event = EventAggregator.GetEvent(metadata.EventType),
Object = command,
Token = token
});
}
}
};
foreach (var metadata in multiGlobalCommand.Metadata.OfType <IAutoInvalidateMetadata>())
{
metadata.AttachMetadataDefinition(EventAggregator, () => multiGlobalCommand.ComputeCommands());
}
}
public TMetadata GetMultiMenuMetadata <TMetadata>(IMultiGlobalCommand multiGlobalCommand) where TMetadata : IMultiMainMenuMetadata
{
return(multiGlobalCommand.Metadata.OfType <MultiMainMenuOption>().Single().OfType <TMetadata>().SingleOrDefault());
}
