/* A simple program to test the Input Method support in the SDL library (1.3+) */

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include "SDL.h"

#include <SDL/SDL_ttf.h>

#define DEFAULT_PTSIZE  30

#define DEFAULT_FONT    "DroidSansFallback.ttf"

#define MAX_TEXT_LENGTH 256

SDL_Surface *screen;

TTF_Font *font;

SDL_Rect textRect, markedRect;

Uint32 lineColor, backColor;

SDL_Color textColor = { 0, 0, 0 };

char text[MAX_TEXT_LENGTH], *markedText;

void InitVideo(int argc, char *argv[])

{

    int width = 500, height = 250;

    SDL_putenv("SDL_VIDEO_WINDOW_POS=center");

    if (SDL_Init(SDL_INIT_VIDEO) < 0)

    {

        fprintf(stderr, "Unable to init SDL: %s\n", SDL_GetError());

        exit(-1);

    }

    /* Initialize fonts */

    TTF_Init();

    font = TTF_OpenFont(DEFAULT_FONT, DEFAULT_PTSIZE);

    if (! font)

    {

        fprintf(stderr, "Failed to find font: %s\n", SDL_GetError());

        exit(-1);

    }

    atexit(SDL_Quit);

    int flags = SDL_HWSURFACE;

    if (argc > 1 && strcmp(argv[1], "--fullscreen") == 0)

    {

        SDL_DisplayMode mode;

        SDL_GetDesktopDisplayMode(&mode);

        width = mode.w;

        height = mode.h;

        fprintf(stderr, "%dx%d\n", width, height);

        flags |= SDL_FULLSCREEN;

    }

    /* Create window */

    screen = SDL_SetVideoMode(width, height, 32, flags);

    if (screen == NULL)

    {

        fprintf(stderr, "Unable to set %dx%d video: %s\n",

                width, height, SDL_GetError());

        exit(-1);

    }

}

void CleanupVideo()

{

    TTF_CloseFont(font);

    TTF_Quit();

}

void InitInput()

{

    backColor = SDL_MapRGB(screen->format, 0xFF, 0xFF, 0xFF);

    lineColor = SDL_MapRGB(screen->format, 0x0, 0x0, 0x0);

    /* Prepare a rect for text input */

    textRect.x = textRect.y = 100;

    textRect.w = screen->w - 2 * textRect.x;

    textRect.h = 50;

    text[0] = 0;

    markedRect = textRect;

    markedText = NULL;

}

static void RenderText(SDL_Surface *sur,

                        TTF_Font *font,

                        const char *text,

                        int x, int y,

                        SDL_Color color)

{

    SDL_Surface *textSur = TTF_RenderUTF8_Blended(font, text, color);

    SDL_Rect dest = { x, y, textSur->w, textSur->h };

    SDL_BlitSurface(textSur, NULL, sur, &dest);

    SDL_FreeSurface(textSur);

}

void Redraw()

{

    int w = 0, h = textRect.h;

    SDL_Rect cursorRect, underlineRect;

    SDL_FillRect(screen, &textRect, backColor);

    if (strlen(text))

    {

        RenderText(screen, font, text, textRect.x, textRect.y, textColor);

        TTF_SizeUTF8(font, text, &w, &h);

    }

    markedRect.x = textRect.x + w;

    markedRect.w = textRect.w - w;

    if (markedRect.w < 0)

    {

        SDL_Flip(screen);

        return;

    }

    SDL_FillRect(screen, &markedRect, backColor);

    if (markedText)

    {

        RenderText(screen, font, markedText, markedRect.x, markedRect.y, textColor);

        TTF_SizeUTF8(font, markedText, &w, &h);

        underlineRect = markedRect;

        underlineRect.y += (h - 2);

        underlineRect.h = 2;

        underlineRect.w = w;

        SDL_FillRect(screen, &underlineRect, lineColor);

    }

    cursorRect = markedRect;

    cursorRect.w = 2;

    cursorRect.h = h;

    SDL_FillRect(screen, &cursorRect, lineColor);

    SDL_Flip(screen);

}

void

HotKey_ToggleFullScreen(void)

{

    SDL_Surface *screen;

    screen = SDL_GetVideoSurface();

    if (SDL_WM_ToggleFullScreen(screen)) {

        printf("Toggled fullscreen mode - now %s\n",

               (screen->flags & SDL_FULLSCREEN) ? "fullscreen" : "windowed");

    } else {

        printf("Unable to toggle fullscreen mode\n");

    }

}

int main(int argc, char *argv[])

{

    InitVideo(argc, argv);

    InitInput();

    Redraw();

    SDL_Event event;

    int done = 0;

    while (! done && SDL_WaitEvent(&event))

    {

        switch (event.type)

        {

        case SDL_KEYDOWN:

            if (event.key.keysym.sym == SDLK_ESCAPE) {

                done = 1;

                break;

            }

            fprintf(stderr,

                    "Keyboard %d: scancode 0x%08X = %s, keycode 0x%08X = %s\n",

                    event.key.which, event.key.keysym.scancode,

                    SDL_GetScancodeName(event.key.keysym.scancode),

                    event.key.keysym.sym, SDL_GetKeyName(event.key.keysym.sym));

            break;

        case SDL_TEXTINPUT:

            if (strlen(event.text.text) == 0 || event.text.text[0] == '\n' ||

                markedRect.w < 0)

                break;

            fprintf(stderr, "Keyboard %d: text input \"%s\"\n",

                    event.text.which, event.text.text);

            if (strlen(text) + strlen(event.text.text) < sizeof(text))

                strcpy(text + strlen(text), event.text.text);

            fprintf(stderr, "text inputed: %s\n", text);

            // After text inputed, we can clear up markedText because it

            // is committed

            markedText = NULL;

            Redraw();

            break;

        case SDL_TEXTEDITING:

            fprintf(stderr, "text editing \"%s\", selected range (%d, %d)\n",

                    event.edit.text, event.edit.start, event.edit.length);

            markedText = event.edit.text;

            Redraw();

            break;

        case SDL_QUIT:

            done = 1;

            break;

        default:

            break;

        }

    }

    CleanupVideo();

    return 0;

}