03-09-2011
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LEARN ABOUT REDHAT
sdl_keysym
SDL_keysym(3) SDL API Reference SDL_keysym(3)
NAME
SDL_keysym- Keysym structure
STRUCTURE DEFINITION
typedef struct{
Uint8 scancode;
SDLKey sym;
SDLMod mod;
Uint16 unicode;
} SDL_keysym;
STRUCTURE DATA
scancode Hardware specific scancode
sym SDL virtual keysym
mod Current key modifiers
unicode Translated character
DESCRIPTION
The SDL_keysym structure is used by reporting key presses and releases since it is a part of the SDL_KeyboardEvent.
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 (see SDL Key Syms. This field is very useful when you are checking for certain key
presses, like so:
.
.
while(SDL_PollEvent(&event)){
switch(event.type){
case SDL_KEYDOWN:
if(event.key.keysym.sym==SDLK_LEFT)
move_left();
break;
.
.
.
}
}
.
.
mod stores the current state of the keyboard modifiers as explained in SDL_GetModState. The unicode is only used when UNICODE translation
is enabled with SDL_EnableUNICODE. 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:
char ch;
if ( (keysym.unicode & 0xFF80) == 0 ) {
ch = keysym.unicode & 0x7F;
}
else {
printf("An International Character.
");
}
UNICODE translation does have a slight overhead so don't enable it unless its needed.
SEE ALSO
SDLKey
SDL
Tue 11 Sep 2001, 23:00 SDL_keysym(3)