Type ActionListener

 object --+        
          |        
INotifyable --+    
              |    
     BaseObject --+
                  |
                 ActionListener

ActionListener () -> ActionListener

Creates a new ActionListener, which can listen to any signal.

The ActionListener can listen to any signal connected to it
through an event. While inheritors of the BaseObject ususally
reassign the internal signal dictionary, the ActionListener will
automatically create the matching signal entry for it.

The callbacks connected to the ActionListener need to match the
following signature:

def function_name (*data):
    ...

Dependant on the data list passed on the connect_signal() call,
the callbacks need to be able to handle that data. The following
examples will show how to do this:

def cb_func (arg1, arg2, arg3):
    ...

ac = ActionListener ()
ac.connect_signal (signal, cb_func, first, second, third)

'first', 'second' and 'third' are passed to the cb_func function
and are available within this function as 'arg1', 'arg2' and
'arg3'.

It is also possible to use a more general argument list within the
callback:

def cb_func (*args):
    ...