Function sdl2_sys::SDL_JoystickNumBalls

pub unsafe extern "C" fn SDL_JoystickNumBalls(
    joystick: *mut SDL_Joystick
) -> c_int

Get the number of trackballs on a joystick.

Joystick trackballs have only relative motion events associated with them and their state cannot be polled.

Most joysticks do not have trackballs.

\param joystick an SDL_Joystick structure containing joystick information \returns the number of trackballs on success or a negative error code on failure; call SDL_GetError() for more information.

\since This function is available since SDL 2.0.0.

\sa SDL_JoystickGetBall