sdl-event/main.c

#include <stdio.h>
#include <SDL2/SDL.h>
#define FF_QUIT_EVENT (SDL_USEREVENT + 2)

int main()
{
    SDL_Window *window = NULL;
    SDL_Renderer *renderer = NULL;

    SDL_Init(SDL_INIT_VIDEO);
    window = SDL_CreateWindow("SDL2 Event",
        SDL_WINDOWPOS_UNDEFINED,
        SDL_WINDOWPOS_UNDEFINED,
        640,
        480,
        SDL_WINDOW_SHOWN | SDL_WINDOW_BORDERLESS);

    if (window == NULL) {
        printf("Could not create window: %s\n", SDL_GetError());
        return 1;
    }

    renderer = SDL_CreateRenderer(window, -1, 0);

    SDL_SetRenderDrawColor(renderer, 255, 255, 0, 255);

    SDL_RenderClear(renderer);

    SDL_RenderPresent(renderer);

    SDL_Event event;
    int b_exit = 0;
    for (;;) {
        SDL_WaitEvent(&event);
        switch (event.type)
        {
        case SDL_KEYDOWN:
            switch (event.key.keysym.sym)
            {
            case SDLK_a:
                printf("user press a\n");
                break;
            case SDLK_s:
                printf("user press s\n");
                break;
            case SDLK_q:
                printf("user press q\n");
                SDL_Event event_quit;
                event_quit.type = FF_QUIT_EVENT;
                SDL_PushEvent(&event_quit);
                break;
            default:
                printf("key down 0x%x\n", event.key.keysym.sym);
                break;
            }
            break;
        case SDL_MOUSEBUTTONDOWN:
            if (event.button.button == SDL_BUTTON_LEFT) {
                printf("mouse left press\n");
            }
            else if (event.button.button == SDL_BUTTON_RIGHT) {
                printf("mouse right press\n");
            }
            else {
                printf("mouse down %d\n", event.button.button);
            }
            break;
        case SDL_MOUSEMOTION:
            printf("mouse movie pos(%d,%d)\n", event.button.x, event.button.y);
            break;
        case FF_QUIT_EVENT:
            printf("receive quit event\n");
            b_exit = 1;
            break;
        default:
            break;
        }

        if (b_exit)
            break;
        
    }

    if (renderer)
        SDL_DestroyRenderer(renderer);

    if (window)
        SDL_DestroyWindow(window);

    SDL_Quit();
    return 0;
}