The Keysym class is used to report key presses and releases. It's
available from the SDL.Event class for keyboard events.
The scancode field should generally be left alone - it is the
hardware dependent scancode returned by the keyboard. The sym
field is extremely useful. It is the SDL-defined value of the key.
This field is very useful when you are checking for certain key presses.
mod stores the current state of the keyboard modifiers as
explained in SDL.get_mod_state() . The unicode field is only used
when UNICODE translation is enabled with SDL.enable_unicode() . If
unicode is non-zero then this a the UNICODE character
corresponding to the keypress. If the high 9 bits of the character
are 0, then this maps to the equivalent ASCII character.
SDL.Joystick()->num_hats()