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[Bill Filler <1236290@xxxxxxxxxxxxxxxxxx>]

** Tags added: rtm14

** Changed in: unity8 (Ubuntu)
   Importance: Undecided => Critical

** Changed in: unity8 (Ubuntu)
     Assignee: (unassigned) => Daniel d'Andrada (dandrader)

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https://bugs.launchpad.net/bugs/1236290

Title:
  [gesture recognition] Implement improved edge gesture detection to
  reduce false positives and pass non-edge gestures through to the
  focused app

Status in Ubuntu UX bugs:
  Fix Committed
Status in The Unity 8 shell:
  Confirmed
Status in “unity8” package in Ubuntu:
  Confirmed

Bug description:
  (from section "3.1 Edge drag gestures" in the "Unity Gesture UI
  Guidelines" doc https://docs.google.com/a/canonical.com/document/d
  /1WJF8YdphrorvHiB5FFVxsitL5Pz-tpZ5-kmtzoD3tFc/edit )

  These are Unity level gestures that allow the user to reveal and
  interact with shell elements like the Launcher.  To reduce the number
  of false positives, edge drag gestures are only triggered when a user
  drags their finger over the edge of the screen and the drag does not
  have following charastics:

  - If the initial velocity is zero or close to zero an edge gesture is
  not triggered.  The gesture is passed through to the app.  This is
  because the intended gesture is probably a tap or a hold

  - If the initial velocity is high an edge gesture is not triggered.
  The gesture is passed through to the app.  This is because the
  intended gesture is probably a flick

  - If the initial direction is not close to perpendicular to the edge
  an edge gesture is not triggered.  This is because the intended
  gesture may be a vertical drag.

  - If at the gesture’s initiation the user has more than one finger
  touching the screen an edge gesture is not triggered.  This is because
  the intended gesture may be a pinch, spread or rotate.

  ---------------------------------------
  Desired resolution:

  - Implement the heuristics defined above for detecting edge gestures
  to reduce the incidence of false positives.

  - The exact values for these heuristics should be easily modifiable so
  that we can experiment with different values to find the optimal
  values.

  - Gestures performed on the edge of the screen when are no longer
  detected as edge gestures due to the above heuristics should be passed
  through to the currently focused app.

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