test/checkkeys.c
author Ryan C. Gordon <icculus@icculus.org>
Thu, 18 Dec 2014 00:19:52 -0500
changeset 9278 8900afb78a19
parent 8149 681eb46b8ac4
child 9580 d37ef6990bf9
permissions -rw-r--r--
Initial merge of Emscripten port!

With this commit, you can compile SDL2 with Emscripten
( http://emscripten.org/ ), and make your SDL-based C/C++ program
into a web app.

This port was due to the efforts of several people, including: Charlie Birks,
Sathyanarayanan Gunasekaran, Jukka Jylänki, Alon Zakai, Edward Rudd,
Bruce Mitchener, and Martin Gerhardy. (Thanks, everyone!)
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/*
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  Copyright (C) 1997-2014 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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#ifdef __EMSCRIPTEN__
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#include <emscripten/emscripten.h>
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#endif
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#include "SDL.h"
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int done;
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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_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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    char *spot, expanded[1024];
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    expanded[0] = '\0';
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    for ( spot = text; *spot; ++spot )
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    {
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        size_t length = SDL_strlen(expanded);
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        SDL_snprintf(expanded + length, sizeof(expanded) - length, "\\x%.2x", (unsigned char)*spot);
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    }
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    SDL_Log("Text (%s): \"%s%s\"\n", expanded, *text == '"' ? "\\" : "", text);
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}
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void
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loop()
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{
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    SDL_Event event;
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    /* Check for events */
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    /*SDL_WaitEvent(&event); emscripten does not like waiting*/
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    while (SDL_PollEvent(&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 == SDL_PRESSED) ? SDL_TRUE : SDL_FALSE, (event.key.repeat) ? SDL_TRUE : SDL_FALSE);
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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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}
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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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	/* Enable standard application logging */
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	SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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    /* Initialize SDL */
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    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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		SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "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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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "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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#ifdef __EMSCRIPTEN__
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    emscripten_set_main_loop(loop, 0, 1);
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#else
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    while (!done) {
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        loop();
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    }
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#endif
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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: */