Class StringInput

#include <stdio.h>
#include <stdlib.h>
#include <SDL/SDL.h>
#include <SDL_ttf.h>
#include <string>

SDL_Event event;

SDL_Surface* screen;
SDL_Surface* message;
SDL_Surface* background;

TTF_Font *font = NULL;
SDL_Color textColor = {255, 255, 255};

SDL_Surface* load_image(std::string filename)
{
	SDL_Surface* loadedImage = NULL;
	SDL_Surface* optimizedImage = NULL;
	loadedImage = SDL_LoadBMP(filename.c_str());
	if (loadedImage != NULL)
	{
		optimizedImage = SDL_DisplayFormat(loadedImage);
		SDL_FreeSurface(loadedImage);
	}
	return optimizedImage;
}

void apply_surface (int x, int y, SDL_Surface* source, SDL_Surface* destination, SDL_Rect* clip = NULL)
{
	SDL_Rect offset;
	offset.x = x;
	offset.y = y;

	SDL_BlitSurface(source, clip, destination, &offset);
}

class StringInput
{
private:
	std::string str;
	SDL_Surface* text;

public:
	StringInput();
	~StringInput();
	void handle_input();
	void show_centered();
};

StringInput::StringInput()
{
	str = "";
	text = NULL;
	SDL_EnableUNICODE(SDL_ENABLE);
}

StringInput::~StringInput()
{
	SDL_FreeSurface(text);
	SDL_EnableUNICODE(SDL_DISABLE);
}

void StringInput::handle_input()
{
	if(event.type == SDL_KEYDOWN)
	{
		std::string temp = str;
		if(str.length() <= 16)
		{
			if(event.key.keysym.unicode == (Uint16)' ')
			{
				str += (char)event.key.keysym.unicode;
			}
			if((event.key.keysym.unicode >= (Uint16)'0') && (event.key.keysym.unicode <= (Uint16)'9'))
			{
				str += (char)event.key.keysym.unicode;
			}
			if((event.key.keysym.unicode >= (Uint16)'A') && (event.key.keysym.unicode <= (Uint16)'Z'))
			{
				str += (char)event.key.keysym.unicode;
			}
			if((event.key.keysym.unicode >= (Uint16)'a') && (event.key.keysym.unicode <= (Uint16)'z'))
			{
				str += (char)event.key.keysym.unicode;
			}
			if((event.key.keysym.unicode == SDLK_BACKSPACE) && (str.length() != 0))
			{
				str.erase(str.length() - 1);
			}
			if(str != temp)
			{
				SDL_FreeSurface(text);
				text = TTF_RenderText_Solid(font, str.c_str(), textColor);
			}
		}
	}
}

void StringInput::show_centered()
{
	if(text != NULL)
	{
		apply_surface((640 - text->w) / 2, (480 - text->h) / 2, text, screen);
	}
}

int main(int, char**)
{
	bool quit = false;
	bool nameEntered = false;

	StringInput name;

	TTF_Init();

	SDL_Init(SDL_INIT_EVERYTHING);
	screen = SDL_SetVideoMode(640, 480, 32, SDL_HWSURFACE);

	font = TTF_OpenFont("lazy.ttf", 28);

	message = TTF_RenderText_Solid(font, "Nouveau record ! Entrez votre nom :", textColor);

	background = load_image("background.bmp");

	//SDL_EnableUNICODE(SDL_ENABLE);

	while(quit == false)
	{
		while(SDL_PollEvent(&event))
		{
			if(nameEntered == false)
			{
				name.handle_input();
				if((event.type == SDL_KEYDOWN) && (event.key.keysym.sym == SDLK_RETURN))
				{
					//SDL_EnableUNICODE(SDL_DISABLE);
					nameEntered = true;
					SDL_FreeSurface(message);
					message = TTF_RenderText_Solid(font, "Rang : 1er", textColor);
				}
			}
			if(event.type == SDL_QUIT)
			{
				quit = true;
			}
		}
		apply_surface(0, 0, background, screen);
		apply_surface((640 - message->w) / 2, ((480 / 2) - message->h) / 2, message, screen);

		name.show_centered();

		SDL_Flip(screen);
	}

	SDL_Quit();
	return 0;
}