CODEWITHSUNDEEP
c++sdl-2touchscreen
pawan kumar
pawan kumar

Reputation: 31

SDL_PollEvent sometime not capturing touch event after screen reconnect

I am using SDL libarary for capturing touch and mouse event on screen. But if i disconnect touch screen and reconnect it, Sometime i stop getting finger touch events i.e SDL_FINGERMOTION, SDL_FINGERDOWN, SDL_FINGERUP.

Below is the code i am using:

while(SDL_PollEvent(&event))
    {
        switch(event.type)
        {
            case SDL_QUIT:{
                //Some Code
            }
            case SDL_MOUSEBUTTONDOWN:{
                //Some Code
            }
            case SDL_MOUSEBUTTONUP:{
                //Some Code
            }
            case SDL_MOUSEMOTION:{
               //Some Code
            }
        case SDL_FINGERMOTION:
        case SDL_FINGERDOWN:
        case SDL_FINGERUP: {
             //Some Code
            }
        }
    }
    return true;
}

Any suggestion would be helpful.

P.S using opensuse 42.2 and SDL2

Upvotes: 1

Views: 1118

Answers (1)

G. Sliepen
G. Sliepen

Reputation: 7983

On Linux, SDL opens each available input event device the moment you call SDL_Init(... | SDL_INIT_EVENTS). If an input device is removed from the system, SDL will get an error whenever it tries to poll it. However, SDL does not get a notification when a new input device is added, and so it will never open new input event devices.

A workaround might be to periodically check /dev/input/event* yourself, see if anything has changed, and if so, do SDL_QuitSubSystem(SDL_INIT_EVENTS); SDL_Init(SDL_INIT_EVENTS). However, that is a hack, and might not work reliably.

Upvotes: 2

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