title: How to use screen_state for accessing particular event like only unlocks
body: <p>currently I'm working in developing a app which can calculate the number of unlocks in a mobile using flutter, for that I'm using screen_state package which can identify the screen on,off and unlock state(that is it say that the screen was turned on/off and the screen got unlocked) , the problem is i just need only to figure out unlocks made and to count it, so is there any possible ways to do that ?</p>