SDL-mirror/test/checkkeys.c

/* Simple program:  Loop, watching keystrokes
   Note that you need to call SDL_PollEvent() or SDL_WaitEvent() to 
   pump the event loop and catch keystrokes.
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "SDL.h"

/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void
quit(int rc)
{
    SDL_Quit();
    exit(rc);
}

static void
print_string(char **text, size_t *maxlen, const char *fmt, ...)
{
    int len;
    va_list ap;

    va_start(ap, fmt);
    len = SDL_vsnprintf(*text, *maxlen, fmt, ap);
    if (len > 0) {
        *text += len;
        if (len < *maxlen) {
            *maxlen -= len;
        } else {
            *maxlen = 0;
        }
    }
    va_end(ap);
}

static void
print_modifiers(char **text, size_t *maxlen)
{
    int mod;
    print_string(text, maxlen, " modifiers:");
    mod = SDL_GetModState();
    if (!mod) {
        print_string(text, maxlen, " (none)");
        return;
    }
    if (mod & KMOD_LSHIFT)
        print_string(text, maxlen, " LSHIFT");
    if (mod & KMOD_RSHIFT)
        print_string(text, maxlen, " RSHIFT");
    if (mod & KMOD_LCTRL)
        print_string(text, maxlen, " LCTRL");
    if (mod & KMOD_RCTRL)
        print_string(text, maxlen, " RCTRL");
    if (mod & KMOD_LALT)
        print_string(text, maxlen, " LALT");
    if (mod & KMOD_RALT)
        print_string(text, maxlen, " RALT");
    if (mod & KMOD_LGUI)
        print_string(text, maxlen, " LGUI");
    if (mod & KMOD_RGUI)
        print_string(text, maxlen, " RGUI");
    if (mod & KMOD_NUM)
        print_string(text, maxlen, " NUM");
    if (mod & KMOD_CAPS)
        print_string(text, maxlen, " CAPS");
    if (mod & KMOD_MODE)
        print_string(text, maxlen, " MODE");
}

static void
PrintKey(SDL_Keysym * sym, SDL_bool pressed, SDL_bool repeat)
{
    char message[512];
    char *spot;
    size_t left;

    spot = message;
    left = sizeof(message);

    /* Print the keycode, name and state */
    if (sym->sym) {
        print_string(&spot, &left,
                "Key %s:  scancode %d = %s, keycode 0x%08X = %s ",
                pressed ? "pressed " : "released",
                sym->scancode,
                SDL_GetScancodeName(sym->scancode),
                sym->sym, SDL_GetKeyName(sym->sym));
    } else {
        print_string(&spot, &left,
                "Unknown Key (scancode %d = %s) %s ",
                sym->scancode,
                SDL_GetScancodeName(sym->scancode),
                pressed ? "pressed" : "released");
    }

    /* Print the translated character, if one exists */
    if (sym->unicode) {
        /* Is it a control-character? */
        if (sym->unicode < ' ') {
            print_string(&spot, &left, " (^%c)", sym->unicode + '@');
        } else {
#ifdef UNICODE
            print_string(&spot, &left, " (%c)", sym->unicode);
#else
            /* This is a Latin-1 program, so only show 8-bits */
            if (!(sym->unicode & 0xFF00))
                print_string(&spot, &left, " (%c)", sym->unicode);
            else
                print_string(&spot, &left, " (0x%X)", sym->unicode);
#endif
        }
    }
    print_modifiers(&spot, &left);
    if (repeat) {
        print_string(&spot, &left, " (repeat)");
    }
    SDL_Log("%s", message);
}

static void
PrintText(char *text)
{
    SDL_Log("Text: %s", text);
}

#if __IPHONEOS__
extern DECLSPEC int SDLCALL SDL_iPhoneKeyboardShow(SDL_Window * window);
#endif

int
main(int argc, char *argv[])
{
    SDL_Window *window;
    SDL_Event event;
    int done;

    /* Initialize SDL */
    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
        fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
        return (1);
    }

    /* Set 640x480 video mode */
    window = SDL_CreateWindow("CheckKeys Test",
                              SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
                              640, 480, 0);
    if (!window) {
        fprintf(stderr, "Couldn't create 640x480 window: %s\n",
                SDL_GetError());
        quit(2);
    }

#if __IPHONEOS__
    /* Creating the context creates the view, which we need to show keyboard */
    SDL_GL_CreateContext(window);
    SDL_iPhoneKeyboardShow(window);
#endif
    

    /* Watch keystrokes */
    done = 0;
    while (!done) {
        /* Check for events */
        SDL_WaitEvent(&event);
        switch (event.type) {
        case SDL_KEYDOWN:
        case SDL_KEYUP:
            PrintKey(&event.key.keysym, event.key.state, event.key.repeat);
            break;
        case SDL_TEXTINPUT:
            PrintText(event.text.text);
            break;
        case SDL_MOUSEBUTTONDOWN:
            /* Any button press quits the app... */
        case SDL_QUIT:
            done = 1;
            break;
        default:
            break;
        }
    }

    SDL_Quit();
    return (0);
}

/* vi: set ts=4 sw=4 expandtab: */