touch-packages team mailing list archive

[Daniel d'Andrada <daniel.dandrada@xxxxxxxxxxxxx>]

>From the attachment you can see that mir giving a bogus event stream.
When you lay two fingers on the screen at roughly the same time (like when doing a pinch gesture) it's common for mir to not generate or send the "down" event for the first touch point.

qtmir has a basic event stream sanity check and validation. It detects
this problem and transforms the action=change for the first touch event
with id=0 into a action=down instead. But then we end up with an input
event with *two* pressed touch points, which at least makes sense but I
think Qt does not like that. It probably expects a single touch up/down
per event, like android. I could make qtmir's event stream validator
more sophisticated and have it split those two touch down actions into
two separate input events, but mir should really send us a clean event
stream in the first place.

** Attachment added: "Typical qtmir log output on an unsuccessful pinch gesture"
   https://bugs.launchpad.net/ubuntu/+source/qtmir/+bug/1531517/+attachment/4545169/+files/qtmir-mir-input.log

** Also affects: mir (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1531517

Title:
  pinch to zoom not working reliably

Status in Canonical System Image:
  Confirmed
Status in mir package in Ubuntu:
  New
Status in qtmir package in Ubuntu:
  Won't Fix

Bug description:
  in the last few days (using rc-proposed 221 on krillin) pinch to zoom
  gestures do not work reliably anymore.

  Appears to be system wide as there have been reports in the follow
  apps that all use PinchArea from QML:

  - Camera: pinch to zoom in viewfinder stops working, pinch to zoom in Photo Roll to zoom a photo stops working
  - Gallery: open a photo and pinch to zoom doesn't work
  - Webbrowser: pinch to zoom on a web page not working

  Could be mir/qtmir related

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