test/checkkeys.c
author Bob Pendleton <bob@pendleton.com>
Tue, 08 Jan 2008 00:10:46 +0000
changeset 2295 dbc6d1893869
parent 1895 c121d94672cb
child 2300 c97ad1abe05b
permissions -rw-r--r--
Checking in Christian Walther's patch for x11 keyboard input. Minor code tweaks by Bob.
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/* Simple program:  Loop, watching keystrokes
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   Note that you need to call SDL_PollEvent() or SDL_WaitEvent() to 
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   pump the event loop and catch keystrokes.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "SDL.h"
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/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
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static void
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quit(int rc)
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{
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    SDL_Quit();
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    exit(rc);
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}
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static void
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print_modifiers(void)
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{
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    int mod;
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    printf(" modifiers:");
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    mod = SDL_GetModState();
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    if (!mod) {
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        printf(" (none)");
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        return;
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    }
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    if (mod & KMOD_LSHIFT)
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        printf(" LSHIFT");
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    if (mod & KMOD_RSHIFT)
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        printf(" RSHIFT");
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    if (mod & KMOD_LCTRL)
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        printf(" LCTRL");
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    if (mod & KMOD_RCTRL)
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        printf(" RCTRL");
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    if (mod & KMOD_LALT)
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        printf(" LALT");
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    if (mod & KMOD_RALT)
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        printf(" RALT");
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    if (mod & KMOD_LMETA)
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        printf(" LMETA");
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    if (mod & KMOD_RMETA)
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        printf(" RMETA");
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    if (mod & KMOD_NUM)
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        printf(" NUM");
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    if (mod & KMOD_CAPS)
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        printf(" CAPS");
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    if (mod & KMOD_MODE)
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        printf(" MODE");
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}
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static void
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PrintKey(SDL_keysym * sym, int pressed)
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{
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    /* Print the keycode, name and state */
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    if (sym->sym) {
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        printf("Key %s:  physical 0x%08X = %s, layout 0x%08X = %s ",
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               pressed ? "pressed " : "released",
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               sym->sym,
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               SDL_GetKeyName(sym->sym),
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               SDL_GetLayoutKey(sym->sym),
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               SDL_GetKeyName(SDL_GetLayoutKey(sym->sym)));
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    } else {
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        printf("Unknown Key (scancode = 0x%08X) %s ",
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               sym->scancode, pressed ? "pressed" : "released");
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    }
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    /* Print the translated character, if one exists */
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    if (sym->unicode) {
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        /* Is it a control-character? */
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        if (sym->unicode < ' ') {
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            printf(" (^%c)", sym->unicode + '@');
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        } else {
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#ifdef UNICODE
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            printf(" (%c)", sym->unicode);
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#else
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            /* This is a Latin-1 program, so only show 8-bits */
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            if (!(sym->unicode & 0xFF00))
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                printf(" (%c)", sym->unicode);
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            else
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                printf(" (0x%X)", sym->unicode);
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#endif
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        }
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    }
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    print_modifiers();
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    printf("\n");
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}
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int
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main(int argc, char *argv[])
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{
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    SDL_Event event;
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    int done;
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    Uint32 videoflags;
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    /* Initialize SDL */
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    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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        fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
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        return (1);
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    }
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    videoflags = SDL_SWSURFACE;
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    while (argc > 1) {
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        --argc;
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        if (argv[argc] && !strcmp(argv[argc], "-fullscreen")) {
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            videoflags |= SDL_FULLSCREEN;
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        } else {
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            fprintf(stderr, "Usage: %s [-fullscreen]\n", argv[0]);
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            quit(1);
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        }
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    }
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    /* Set 640x480 video mode */
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    if (SDL_SetVideoMode(640, 480, 0, videoflags) == NULL) {
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        fprintf(stderr, "Couldn't set 640x480 video mode: %s\n",
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                SDL_GetError());
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        quit(2);
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    }
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    /* Enable UNICODE translation for keyboard input */
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    SDL_EnableUNICODE(1);
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    /* Enable auto repeat for keyboard input */
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    SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY,
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                        SDL_DEFAULT_REPEAT_INTERVAL);
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    /* Watch keystrokes */
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    done = 0;
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    while (!done) {
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        /* Check for events */
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        SDL_WaitEvent(&event);
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        switch (event.type) {
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        case SDL_KEYDOWN:
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            PrintKey(&event.key.keysym, 1);
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            break;
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        case SDL_KEYUP:
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            PrintKey(&event.key.keysym, 0);
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            break;
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        case SDL_MOUSEBUTTONDOWN:
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            /* Any button press quits the app... */
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        case SDL_QUIT:
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            done = 1;
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            break;
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        default:
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            break;
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        }
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    }
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    SDL_Quit();
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    return (0);
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}