Comment 14 for bug 1531517
Revision history for this message
| Daniel d'Andrada (dandrader) wrote Re: [Bug 1531517] Re: [regression] pinch to zoom not working reliably | #14 |
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1b1ed1a
(Get the code!)
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).