Handling Input

  type
    One of: 
      MouseEvent.movement
      MouseEvent.relative_movement,
      MouseEvent.button_press
      MouseEvent.button_release,
      MouseEvent.wheel_up
      MouseEvent.wheel_down, 
      MouseEvent.present
      MouseEvent.absent

  mouse_id
    Which mouse is being used.  Normally this will be 1.  For
    iPhone, each different simultaneous touch is sent as a
    different mouse_id that will remain the same throughout the
    duration of the touch.

  position
    The mouse position at the time of the mouse event.

  button
    The mouse button that was pressed for appropriate events.

  type
    One of: 
      KeyEvent.press
      KeyEvent.repeat
      KeyEvent.release

  keycode
    The raw keycode of the key pressed - Key.keycode_a,
    Key.keycode_0, etc.  Corresponds to SDL keycode values.

  unicode
    The unicode value of the key pressed - 'A', '0', etc.

  modifiers
    Flags indicating what key modifiers were pressed at the time
    of the key event.  Use the following methods to check
    (event is the KeyEvent; the methods are actualy defined
    in class KeyEventManager).

      event.shift_pressed
      event.ctrl_pressed
      event.alt_pressed
      event.caps_locked

  controller_id
    Which controller is being used.  This will be 1 on the iPhone;
    it can be 1..4 on the Wii.

  x, y, z
    The acceleration on the x, y, and z axes.

Methods (defined in class AccelerationEventManager):

    orientation().RollPitchYaw
      Returns a RollPitchYaw compound (containing roll,pitch,yaw:Radians)
      with the orientation of the device assuming that gravity is 
      the primary force acting on the device (in other words this
      doesn't work if it's being shaken violently).

  type
    One of:
      SystemEvent.garbage_collected
        Indicates that a garbage collection has just finished.

      SystemEvent.resources_loaded
        Indicates that all resources have finished loading as a
        a consequence of an earlier call to ResourceManager.load().