[Vala] How to get the result of signal when emitting it?

[Tal Hadad <tal_hd hotmail com>]

Is this possible to get the result(return) of signals handlers?
Take for example some of Gtk signals. Sometimes the docs say something like that:
...
return : FALSE for continue event further, TRUE otherwise.

I wonder, is it possible in Vala? If not, I'll have to use a delegate property.

Tal