OnePlus uses the classic Android Ambient Display for pulsing only
a few letters on the screen when a notification comes in, although this comes nicely into play with the alert slider too.
Not exact matches
There are
few letters that the lock
screen would recognize and based
on what operation you've selected it will open that once you draw that
letter.
The launcher learns your app usage habits and adjusts the shortcuts accordingly, and when you need to access an app not displayed
on the home
screen you can either type the first
few letters on the keypad or swipe up for a traditional app drawer.