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[Zsombor Egri <1527387@xxxxxxxxxxxxxxxxxx>]

** Changed in: ubuntu-ui-toolkit (Ubuntu)
     Assignee: (unassigned) => Michael Terry (mterry)

** Changed in: ubuntu-ui-toolkit (Ubuntu)
       Status: New => In Progress

** Changed in: ubuntu-ui-toolkit (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1527387

Title:
  SwipeArea: Support watching a swipe without owning its events

Status in ubuntu-ui-toolkit package in Ubuntu:
  In Progress

Bug description:
  == Ask ==

  I want to add SwipeArea.monitorOnly (name is up for debate) which lets
  input events "fall through" (i.e. it doesn't own them) but continues
  to monitor them.

  I have a specific need for it, but it might be a generally useful
  thing?

  == Backstory ==

  Recently, the UITK got SwipeArea, which is great.  In unity8, I'm
  working on a redesign of the edge introduction tutorial on first boot
  of your device.

  There's a part of it where we put a shell-wide overlay on top of the
  screen that says "Swipe from the bottom to do ..." and this should
  fade out as the user swipes up (but should do the right thing if the
  drag isn't completed or is held in place).

  One way to do this would be to communicate with the app.  But that's a
  lot of infrastructure for one little feature.  And this feature might
  be short-lived, because eventually we're going to try to move those
  "coach mark" help screens in the UITK as well for apps to use
  themselves.  But for now, the shell is showing the bottom edge coach
  mark for a select few apps.

  So another easy way to do it is to be able to monitor the user's drag,
  but not interfere with it.  So the shell can see what the drag is
  doing, but the app still does the drag itself.

  == Next Steps ==

  I was working on a unity8 branch to add a monitorOnly field to
  DirectionalDragArea, but that got moved into UITK as SwipeArea and is
  being dropped from unity8.  So now I've come here to try to add it.

  You can see the WIP branch linked from this bug [1] to see the kind of
  change I'd propose.

  But before finalizing that branch by fleshing out tests and such, I
  would appreciate feedback on how receptive you are to it, whether you
  want a different name than 'monitorOnly', etc.  Thanks.

  [1] https://code.launchpad.net/~mterry/ubuntu-ui-toolkit/monitor-
  only/+merge/280923

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