$Date: 2005/10/23 11:21:01 $
$Revision: 1.6 $
-- Initialise default values.
-- List of joystick foci
-- Is any focus present?
-- Add a_focus to focus_list.
-- Remove a_focus from focus_list.
-- Publish an_event to all joystick foci.
-- Publish an_event to all joystick foci.
-- Publish an_event to all joystick foci.
-- Publish an_event to all joystick foci.
-- Publish an_event to all joystick foci.
Store and manage the joystick focus. The joystick focus has to be set manually
and thus to be cleared manually. Also it can be shared by multiple objects.
Use EM_SHARED_FOCUS to access the singleton instance.