Re: RFC: gesture management model

[Carlos Garnacho <carlosg gnome org>]

Hey Matthias,

On Sun, 2013-08-11 at 18:25 -0400, Matthias Clasen wrote:
> Hey Carlos,
>
> thanks for writing this up in excruciating detail. I'm sorry that we
> didn't get to discuss this at the GTK+ meeting. 

Oh well, it was tight on time, and there's enough items on the 3.10
plate, glad to get this moving anyways.

> It sounds reasonable
> to me, as far as the event controllers themselves are concerned. It
> would be great to learn some more about how this would do for
> backwards compatibility with widgets that expect to handle events 'the
> old way'.

Right, I didn't get too deep in there, essentially an unchanged widget
would still get to receive and handle events as they did previously,
even if a controller acknowledges the touch sequence (and this action
doesn't trigger grabs, etc), no event blocking would happen at the
capture phase.

This however could just need minor adaptions, the ::ownership-claimed
signal could be considered another "drop your interaction with this
device/touch id" notification as ::grab-notify and GdkEventGrabBroken
essentially are, even if a widget doesn't make use of event controllers
itself. Widgets interested in this will likely have similar codepaths
already.

Cheers,
  Carlos