test/testime.c
author dewyatt
Sun, 25 Jul 2010 13:17:31 -0400
changeset 4757 140be6839185
parent 4756 b99b1024607a
child 4763 518d1679d2d0
permissions -rw-r--r--
Correctly draw cursor based on position.
Had to add UTF-8 functions utf8_length, utf8_next, utf8_advance.
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/* A simple program to test the Input Method support in the SDL library (1.3+) */
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "SDL.h"
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#ifdef HAVE_SDL_TTF
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#include "SDL_ttf.h"
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#endif
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#define DEFAULT_PTSIZE  30
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#ifdef __QNXNTO__
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    #define DEFAULT_FONT    "/usr/photon/font_repository/tt0003m_.ttf"
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#else
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    #define DEFAULT_FONT    "/System/Library/Fonts/华文细黑.ttf"
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#endif
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#define MAX_TEXT_LENGTH 256
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SDL_Surface *screen;
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#ifdef HAVE_SDL_TTF
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TTF_Font *font;
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#endif
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SDL_Rect textRect, markedRect;
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Uint32 lineColor, backColor;
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SDL_Color textColor = { 0, 0, 0 };
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char text[MAX_TEXT_LENGTH], markedText[SDL_TEXTEDITINGEVENT_TEXT_SIZE];
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int cursor = 0;
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size_t utf8_length(unsigned char c)
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{
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    c = (unsigned char)(0xff & c);
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    if (c < 0x80)
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        return 1;
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    else if ((c >> 5) ==0x6)
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        return 2;
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    else if ((c >> 4) == 0xe)
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        return 3;
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    else if ((c >> 3) == 0x1e)
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        return 4;
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    else
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        return 0;
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}
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char *utf8_next(char *p)
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{
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    size_t len = utf8_length(*p);
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    size_t i = 0;
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    if (!len)
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        return 0;
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    for (; i < len; ++i)
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    {
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        ++p;
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        if (!*p)
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            return 0;
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    }
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    return p;
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}
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char *utf8_advance(char *p, size_t distance)
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{
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    size_t i = 0;
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    for (; i < distance && p; ++i)
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    {
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        p = utf8_next(p);
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    }
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    return p;
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}
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void usage()
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{
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    printf("usage: testime [--font fontfile] [--fullscreen]\n");
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    exit(0);
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}
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void InitVideo(int argc, char *argv[])
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{
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    int width = 640, height = 480;
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    int flags = SDL_HWSURFACE;
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    const char *fontname = DEFAULT_FONT;
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    int fullscreen = 0;
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    for (argc--, argv++; argc > 0; argc--, argv++)
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    {
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        if (strcmp(argv[0], "--help") == 0)
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            usage();
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        else if (strcmp(argv[0], "--fullscreen") == 0)
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            fullscreen = 1;
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        else if (strcmp(argv[0], "--font") == 0)
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        {
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            argc--;
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            argv++;
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            if (argc > 0)
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                fontname = argv[0];
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            else
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                usage();
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        }
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    }
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    SDL_setenv("SDL_VIDEO_WINDOW_POS", "center", 1);
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    if (SDL_Init(SDL_INIT_VIDEO) < 0)
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    {
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        fprintf(stderr, "Unable to init SDL: %s\n", SDL_GetError());
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        exit(-1);
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    }
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#ifdef HAVE_SDL_TTF
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    /* Initialize fonts */
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    TTF_Init();
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    font = TTF_OpenFont(fontname, DEFAULT_PTSIZE);
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    if (! font)
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    {
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        fprintf(stderr, "Failed to find font: %s\n", TTF_GetError());
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        exit(-1);
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    }
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#endif
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    printf("Using font: %s\n", fontname);
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    atexit(SDL_Quit);
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    if (fullscreen)
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    {
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        SDL_DisplayMode mode;
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        SDL_GetDesktopDisplayMode(&mode);
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        width = mode.w;
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        height = mode.h;
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        fprintf(stderr, "%dx%d\n", width, height);
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        flags |= SDL_FULLSCREEN;
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    }
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    /* Create window */
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    screen = SDL_SetVideoMode(width, height, 32, flags);
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    if (screen == NULL)
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    {
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        fprintf(stderr, "Unable to set %dx%d video: %s\n",
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                width, height, SDL_GetError());
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        exit(-1);
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    }
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}
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void CleanupVideo()
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{
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    SDL_StopTextInput();
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#ifdef HAVE_SDL_TTF
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    TTF_CloseFont(font);
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    TTF_Quit();
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#endif
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}
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void InitInput()
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{
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    backColor = SDL_MapRGB(screen->format, 0xFF, 0xFF, 0xFF);
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    lineColor = SDL_MapRGB(screen->format, 0x0, 0x0, 0x0);
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    /* Prepare a rect for text input */
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    textRect.x = textRect.y = 100;
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    textRect.w = screen->w - 2 * textRect.x;
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    textRect.h = 50;
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    text[0] = 0;
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    markedRect = textRect;
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    markedText[0] = 0;
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    SDL_StartTextInput();
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}
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#ifdef HAVE_SDL_TTF
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static void RenderText(SDL_Surface *sur,
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                        TTF_Font *font,
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                        const char *text,
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                        int x, int y,
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                        SDL_Color color)
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{
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    SDL_Surface *textSur = TTF_RenderUTF8_Blended(font, text, color);
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    SDL_Rect dest = { x, y, textSur->w, textSur->h };
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    SDL_BlitSurface(textSur, NULL, sur, &dest);
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    SDL_FreeSurface(textSur);
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}
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#endif
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void Redraw()
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{
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    int w = 0, h = textRect.h;
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    SDL_Rect cursorRect, underlineRect;
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    SDL_FillRect(screen, &textRect, backColor);
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#ifdef HAVE_SDL_TTF
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    if (strlen(text))
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    {
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        RenderText(screen, font, text, textRect.x, textRect.y, textColor);
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        TTF_SizeUTF8(font, text, &w, &h);
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    }
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#endif
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    markedRect.x = textRect.x + w;
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    markedRect.w = textRect.w - w;
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    if (markedRect.w < 0)
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    {
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        SDL_Flip(screen);
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        // Stop text input because we cannot hold any more characters
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        SDL_StopTextInput();
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        return;
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    }
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    else
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    {
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        SDL_StartTextInput();
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    }
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    cursorRect = markedRect;
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    cursorRect.w = 2;
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    cursorRect.h = h;
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    SDL_FillRect(screen, &markedRect, backColor);
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    if (markedText[0])
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    {
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#ifdef HAVE_SDL_TTF
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        if (cursor)
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        {
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            char *p = utf8_advance(markedText, cursor);
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            char c = 0;
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            if (!p)
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                p = &markedText[strlen(markedText)];
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            c = *p;
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            *p = 0;
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            TTF_SizeUTF8(font, markedText, &w, 0);
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            cursorRect.x += w;
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            *p = c;
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        }
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        RenderText(screen, font, markedText, markedRect.x, markedRect.y, textColor);
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        TTF_SizeUTF8(font, markedText, &w, &h);
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#endif
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        underlineRect = markedRect;
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        underlineRect.y += (h - 2);
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        underlineRect.h = 2;
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        underlineRect.w = w;
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        SDL_FillRect(screen, &underlineRect, lineColor);
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    }
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    SDL_FillRect(screen, &cursorRect, lineColor);
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    SDL_Flip(screen);
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    SDL_SetTextInputRect(&markedRect);
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}
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void
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HotKey_ToggleFullScreen(void)
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{
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    SDL_Surface *screen;
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    screen = SDL_GetVideoSurface();
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    if (SDL_WM_ToggleFullScreen(screen)) {
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        printf("Toggled fullscreen mode - now %s\n",
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               (screen->flags & SDL_FULLSCREEN) ? "fullscreen" : "windowed");
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    } else {
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        printf("Unable to toggle fullscreen mode\n");
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    }
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}
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int main(int argc, char *argv[])
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{
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    SDL_Event event;
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    int done = 0;
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    InitVideo(argc, argv);
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    InitInput();
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    Redraw();
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    while (! done && SDL_WaitEvent(&event))
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    {
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        switch (event.type)
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        {
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        case SDL_KEYDOWN:
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            switch (event.key.keysym.sym)
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            {
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                case SDLK_ESCAPE:
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                     done = 1;
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                     break;
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                case SDLK_RETURN:
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                     text[0]=0x00;
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                     Redraw();
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                     break;
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                case SDLK_BACKSPACE:
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                     {
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                         int textlen=SDL_strlen(text);
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                         do {
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                             if (textlen==0)
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                             {
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                                 break;
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                             }
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                             if ((text[textlen-1] & 0x80) == 0x00)
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                             {
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                                 /* One byte */
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                                 text[textlen-1]=0x00;
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                                 break;
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                             }
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                             if ((text[textlen-1] & 0xC0) == 0x80)
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                             {
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                                 /* Byte from the multibyte sequence */
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                                 text[textlen-1]=0x00;
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                                 textlen--;
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                             }
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                             if ((text[textlen-1] & 0xC0) == 0xC0)
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                             {
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                                 /* First byte of multibyte sequence */
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                                 text[textlen-1]=0x00;
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                                 break;
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                             }
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                         } while(1);
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                         Redraw();
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                     }
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                     break;
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            }
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            if (done)
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            {
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                break;
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            }
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            fprintf(stderr,
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                    "Keyboard: scancode 0x%08X = %s, keycode 0x%08X = %s\n",
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                    event.key.keysym.scancode,
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                    SDL_GetScancodeName(event.key.keysym.scancode),
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                    event.key.keysym.sym, SDL_GetKeyName(event.key.keysym.sym));
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            break;
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        case SDL_TEXTINPUT:
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            if (SDL_strlen(event.text.text) == 0 || event.text.text[0] == '\n' ||
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                markedRect.w < 0)
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                break;
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            fprintf(stderr, "Keyboard: text input \"%s\"\n", event.text.text);
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            if (SDL_strlen(text) + SDL_strlen(event.text.text) < sizeof(text))
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                strcat(text, event.text.text);
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            fprintf(stderr, "text inputed: %s\n", text);
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            // After text inputed, we can clear up markedText because it
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            // is committed
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            markedText[0] = 0;
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            Redraw();
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            break;
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        case SDL_TEXTEDITING:
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            fprintf(stderr, "text editing \"%s\", selected range (%d, %d)\n",
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                    event.edit.text, event.edit.start, event.edit.length);
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            strcpy(markedText, event.edit.text);
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            cursor = event.edit.start;
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            Redraw();
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            break;
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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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    CleanupVideo();
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    return 0;
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}