screen_touch_callback

pros_sys::screen

Function screen_touch_callback 

Source 
pub unsafe extern "C" fn screen_touch_callback(
    cb: touch_event_cb_fn_t,
    event_type: last_touch_e_t,
) -> u32
Expand description

Assigns a callback function to be called when a certain touch event happens.

This function uses the following values of errno when an error state is reached: EACCESS - Another resource is currently trying to access the screen mutex.

\param cb Function pointer to callback when event type happens \param event_type Touch event that will trigger the callback.

\return 1 if there were no errors, or PROS_ERR if an error occured while taking or returning the screen mutex.