Swiping the note action button in the lock screen UI is supposed to launch a lock screen note taking app.

This works fine in web ui based lock screen, but is still unimplemented in the views based lock screen. 

For views base lock screen, the note action is implemented as an image button, which, as a view has OnGestureEvent method that gets called when gestures are detected in that view.
There are two problems, though:

1. The note action is located in top right corner, and swipe direction is expected to be bottom-left. Currently, gesture detector used by views only detects swipe gestures in one of the following directions: [top, right, bottom, left]. This means that gestures the note action button is interested in go unnoticed.

2. Size of the note action button is such that only the starting swipe point is on top of it - the gesture will end outside the button bounds. Consequentially, the button will not receive the gesture event.