mouse_callback
User specified mouse callback.
Description
Called by the interrupt handler whenever the mouse moves or one of the
buttons changes state. This function must be in locked memory, and must
execute _very_ quickly! It is passed the event flags that triggered the
call, which is a bitmask containing any of the values MOUSE_FLAG_MOVE,
MOUSE_FLAG_LEFT_DOWN, MOUSE_FLAG_LEFT_UP, MOUSE_FLAG_RIGHT_DOWN,
MOUSE_FLAG_RIGHT_UP, MOUSE_FLAG_MIDDLE_DOWN, MOUSE_FLAG_MIDDLE_UP, and
MOUSE_FLAG_MOVE_Z. Note that even if the mouse has more than three buttons,
only the first three can be trapped using a callback.
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