test/checkkeys.c
author Sam Lantinga <slouken@libsdl.org>
Sat, 18 May 2013 14:17:52 -0700
changeset 7191 75360622e65f
parent 6922 91d157d9f283
child 7312 b36811d7db33
permissions -rw-r--r--
File style cleanup for the SDL 2.0 release
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/*
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  Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely.
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*/
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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_string(char **text, size_t *maxlen, const char *fmt, ...)
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{
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    int len;
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    va_list ap;
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    va_start(ap, fmt);
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    len = SDL_vsnprintf(*text, *maxlen, fmt, ap);
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    if (len > 0) {
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        *text += len;
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        if ( ((size_t) len) < *maxlen ) {
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            *maxlen -= (size_t) len;
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        } else {
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            *maxlen = 0;
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        }
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    }
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    va_end(ap);
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}
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static void
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print_modifiers(char **text, size_t *maxlen)
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{
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    int mod;
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    print_string(text, maxlen, " modifiers:");
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    mod = SDL_GetModState();
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    if (!mod) {
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        print_string(text, maxlen, " (none)");
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        return;
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    }
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    if (mod & KMOD_LSHIFT)
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        print_string(text, maxlen, " LSHIFT");
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    if (mod & KMOD_RSHIFT)
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        print_string(text, maxlen, " RSHIFT");
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    if (mod & KMOD_LCTRL)
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        print_string(text, maxlen, " LCTRL");
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    if (mod & KMOD_RCTRL)
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        print_string(text, maxlen, " RCTRL");
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    if (mod & KMOD_LALT)
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        print_string(text, maxlen, " LALT");
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    if (mod & KMOD_RALT)
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        print_string(text, maxlen, " RALT");
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    if (mod & KMOD_LGUI)
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        print_string(text, maxlen, " LGUI");
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    if (mod & KMOD_RGUI)
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        print_string(text, maxlen, " RGUI");
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    if (mod & KMOD_NUM)
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        print_string(text, maxlen, " NUM");
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    if (mod & KMOD_CAPS)
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        print_string(text, maxlen, " CAPS");
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    if (mod & KMOD_MODE)
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        print_string(text, maxlen, " MODE");
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}
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static void
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PrintKey(SDL_Keysym * sym, SDL_bool pressed, SDL_bool repeat)
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{
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    char message[512];
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    char *spot;
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    size_t left;
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    spot = message;
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    left = sizeof(message);
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    /* Print the keycode, name and state */
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    if (sym->sym) {
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        print_string(&spot, &left,
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                "Key %s:  scancode %d = %s, keycode 0x%08X = %s ",
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                pressed ? "pressed " : "released",
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                sym->scancode,
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                SDL_GetScancodeName(sym->scancode),
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                sym->sym, SDL_GetKeyName(sym->sym));
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    } else {
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        print_string(&spot, &left,
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                "Unknown Key (scancode %d = %s) %s ",
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                sym->scancode,
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                SDL_GetScancodeName(sym->scancode),
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                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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            print_string(&spot, &left, " (^%c)", sym->unicode + '@');
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        } else {
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#ifdef UNICODE
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            print_string(&spot, &left, " (%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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                print_string(&spot, &left, " (%c)", sym->unicode);
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            else
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                print_string(&spot, &left, " (0x%X)", sym->unicode);
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#endif
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        }
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    }
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    print_modifiers(&spot, &left);
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    if (repeat) {
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        print_string(&spot, &left, " (repeat)");
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    }
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    SDL_Log("%s\n", message);
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}
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static void
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PrintText(char *text)
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{
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    SDL_Log("Text: %s\n", text);
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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_Window *window;
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    SDL_Event event;
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    int done;
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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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    /* Set 640x480 video mode */
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    window = SDL_CreateWindow("CheckKeys Test",
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                              SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
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                              640, 480, 0);
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    if (!window) {
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        fprintf(stderr, "Couldn't create 640x480 window: %s\n",
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                SDL_GetError());
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        quit(2);
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    }
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#if __IPHONEOS__
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    /* Creating the context creates the view, which we need to show keyboard */
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    SDL_GL_CreateContext(window);
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#endif
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    SDL_StartTextInput();
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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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        case SDL_KEYUP:
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            PrintKey(&event.key.keysym, event.key.state, event.key.repeat);
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            break;
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        case SDL_TEXTINPUT:
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            PrintText(event.text.text);
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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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}
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/* vi: set ts=4 sw=4 expandtab: */