How to block a global shortcut action on a TopComponent ?

[Jerome Lelasseux]

In my NB application I have always enabled actions for which a global shortcut 
is defined using annotations such as @ActionReference(path = "Shortcuts", name 
= "SPACE"). It works fine.
I'd like these global shortcuts to NOT work when a specific TopComponent is 
active. Is there a way to do it in a generic way ?