A simple SDL2 menu

[joakim12]

Hi!

I’m trying to make a simple SDL menu and I can not get two SDL_PollEvents to work. How to solve the problem? Some ideas?

#include <GL/glew.h>
#include <SDL2/SDL.h>
#include <SDL2/SDL_opengl.h>
#include <SDL2/SDL_ttf.h>
#include <GL/gl.h>
#include <iostream>
#include <string>
#include <vector>
#include <limits.h>

using namespace std;

SDL_Window *gWindow;
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
SDL_Event event;

class Menu
{
	SDL_Surface* screen;
	TTF_Font* font;
	int x, y; 					// Mouse position
	int NUMMENUS = 0;
	vector<string> labels{};
	vector<SDL_Surface*> menus{};
	vector<SDL_Rect> pos{};
	SDL_Surface* ekraan;
	int suurim = 0;
	SDL_Rect ajutine;

	public:
	Menu ( TTF_Font* SisendFont, vector<string> iLabels)
	{
		ekraan = SDL_GetWindowSurface(gWindow);
		font =  SisendFont;
		labels = iLabels;
		int suurus = 0;
		int ajutine_suurus = 0;

		for (vector<string>::iterator it = iLabels.begin();\
			 it != iLabels.end(); it++)
		{
			NUMMENUS++;
		};

		for (int i = 0; i < NUMMENUS; i++)
		{	
			ajutine_suurus = labels.at(i).size();
			if (suurus < ajutine_suurus)
			{
				suurim = i;
				suurus = ajutine_suurus;
			};
		};

		for (int i = 0; i < NUMMENUS; i++)
			menus.push_back(TTF_RenderText_Solid(font, labels.at(i).c_str(), {255,255,255}));
	};

	// Event loop
	int valja()
	{
      ekraan = SDL_GetWindowSurface(gWindow);

      ajutine.w = menus.at(suurim)->w;
		ajutine.h = menus.at(suurim)->h;
		pos = {};
		for (int i = 0; i < NUMMENUS; i++)
      {  
         ajutine.x = ekraan->w/2 - menus.at(suurim)->w/2;
         ajutine.y = ekraan->h/2 + (menus.at(suurim)->h)*(i-1);
         pos.push_back(ajutine);
      }

//		SDL_Event event;
		SDL_Rect raam;
		raam.x = ekraan->w/2 - menus.at(suurim)->w/2;
		raam.y = ekraan->h/2 - menus.at(suurim)->h;
		raam.w = menus.at(suurim)->w;
		raam.h = (menus.at(suurim)->h)*NUMMENUS;

		SDL_FillRect(ekraan, /*&screen->clip_rect*/ &raam, SDL_MapRGB(ekraan->format, 128, 128, 128));
      SDL_UpdateWindowSurface(gWindow);
		
		// Väljastamine
		for(int i=0; i < NUMMENUS; i++)
         if((SDL_BlitSurface(menus.at(i), NULL, ekraan, &pos.at(i)))<0)
				printf("Blit error %s\n", SDL_GetError());
		SDL_UpdateWindowSurface(gWindow);

		
		while ((SDL_PollEvent(&event) != 0))
		{
			cout<<"Poll outcome\n";
			if (/*event.type== SDL_MOUSEBUTTONDOWN && */event.button.button == SDL_BUTTON_LEFT)
			{
				x=event.button.x;
				y=event.button.y;
				for(int i = 0; i<NUMMENUS; i++)
					if(x>=pos.at(i).x && x<=pos.at(i).x+pos.at(i).w &&
						y>=pos.at(i).y && y<=pos.at(i).y+pos.at(i).h)
						return i;
					else
						return -1;
			};
		};
	};
};

// Initialize SDL
bool init()
{
   //Initialization flag
   bool success = true;

   //Initialize SDL
   if( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_TIMER ) < 0 )
   {
      printf( "SDL could not initialize! SDL_Error: %s\n", SDL_GetError() );
      success = false;
   } else {
      //Create window
      gWindow = SDL_CreateWindow( "Create Triangle", SDL_WINDOWPOS_UNDEFINED,
					 SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, 
					 SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE );
      if( gWindow == NULL )
      {
         printf( "Window could not be created! SDL_Error: %s\n", SDL_GetError() );
         success = false;
      }
	}	
	if(TTF_Init()==-1)
	{
		printf("TTF_Init: %s\n", TTF_GetError());
		success = false;
	};
	return success;
};

void Exit()
{
	TTF_Quit();
	SDL_DestroyWindow(gWindow);
	SDL_Quit();
}


int main (int argc, char* argv[])
{
	if( !init() )
   {
		printf( "Failed to initialize!\n" );
	} else 
	{
		// Fondi avamine
		TTF_Font* Font;
		Font = TTF_OpenFont("Lohit-Devanagari.ttf",20);
		if (!Font)
			printf("TTF_OpenFont: %s\n", TTF_GetError());

		// Menüü loomine
		SDL_Surface *screen;
		screen = SDL_GetWindowSurface(gWindow);
		if(!screen)
		{
			printf("SDL_GetWindowSurface error: %s\n", SDL_GetError());
		}

		vector<string> nimed{};
		nimed.push_back("Esimene");
      nimed.push_back("Teine");
		nimed.push_back("Seitsmes");
      nimed.push_back("Kolmas");
		Menu menu(Font, nimed);

      bool quit = false;
//      SDL_Event e;

		while ( !quit )
		{
         while( SDL_PollEvent(&event) != 0)
         {
            switch ( event.type )
               {
               case SDL_QUIT:
                     quit = true;
							Exit();
                     break;
					case SDL_MOUSEBUTTONDOWN:
							if (event.button.button == SDL_BUTTON_RIGHT)
							{
							int j = menu.valja();
								switch (j)
								{
									case 0:
										cout<<"Esimene\n";
										break;
									case 1:
										cout<<"Teine\n";
										break;
									case 2:
										cout<<"Kolmas\n";
										break;
									case -1:
										cout<<"Mujale\n";
										break;
								}
							}
							break;
               }
         }
		}
	}
	return 0;
}