touch-packages team mailing list archive

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

On 12/01/2016 05:39, Daniel van Vugt wrote:
> dandrader:
> It's been a useful quirk of Android input until now that multi-touch gestures get separate events for each finger, but I think we all need to ensure our client code does not assume that's always true.
>
> It wasn't a design choice of Mir's, but just something we inherited from
> Android. There's a good argument that Mir's semantics should not change,
> because it annoys people obviously. On the other hand it would be
> difficult to keep all the quirks of Android input in the transition to
> libinput. And I think the semantics of receiving a single event where
> two fingers go down at once is perfectly valid. We should all be writing
> client code that expects that might happen.
>

If you read my message carefully you will see that Mir is not even doing 
that (two fingers down on the same event). It was qtmir that was mending 
the event stream to do so. Mir was completely missing the down event for 
the first touch. So all of the blue you got a "touch 1 move + touch 2 
down" (no touch 1 down beforehand).

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

Title:
  [regression] pinch to zoom not working reliably

Status in Canonical System Image:
  Confirmed
Status in Mir:
  Confirmed
Status in Mir 0.18 series:
  Confirmed
Status in mir package in Ubuntu:
  Confirmed
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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