input_pipeline > Gestures > Primary Tap Recognizer
Reviewed-on: 2022-07-06
Purpose
The tap recognizer detects a one-finger-tap on the touchpad, generates a mouse click event, and discards all touchpad events related to the tap.
A tap occurs when the user puts one-finger down on the touchpad, exercises zero-to-minimal movement of that one finger, and then removes that finger, all within a short time frame and without moving the pad. (This is distinct from a click, for which a user exerts enough force on the touchpad to move the pad itself.)
Notably, this includes discarding any spurious motion that occurs during the tap (when a finger has made contact down but has not yet been raised up).
State machine
The tap recognizer implements the state machine below.
The state machine is also available in other formats:
