Brew MP 1.0.2
The FocusController is responsible for handling all focus movement
between TrigML elements.
Users can request that focus be moved by calling functions such as
IFOCUSCONTROLLER_MoveFocus. If users want to become a focus handler, so
that they can handle the focus movement themselves (example for animating
focus movement), then they should add themselves as a focus handler through
the IFOCUSCONTROLLER_AddFocusHandler() function.
A FocusController object is assigned to each player following a call to
ISHELL_CreateInstance() with AEECLSID_TRIGPLAYER
as the class id.
ITRIGPLAYEREX_GetFocusController() can be used to get the IFocusController
associated with a particular player.