SDL_KeyboardEvent- Keyboard event structure
SDL_KEYDOWN or SDL_KEYUP
SDL_PRESSED or SDL_RELEASED
Contains key press information
SDL_KeyboardEvent is a member of the SDL_Event union and is used when an event
of type SDL_KEYDOWN or SDL_KEYUP is reported.
The type and state actually report the same information, they just use different
values to do it! A keyboard event occurs when a key is released (type=SDK_KEYUP
or state=SDL_RELEASED) and when a key is pressed (type=SDL_KEYDOWN or
state=SDL_PRESSED). The information on what key was pressed or released is in
the keysym structure.
Repeating SDL_KEYDOWN events will occur if key repeat is enabled (see
SDL_Event, SDL_keysym, SDL_EnableKeyRepeat, SDL_EnableUNICODE