Compositor grabs (was: Re: [PATCH] protocol: Add DnD actions)
spitzak at gmail.com
Fri Apr 17 14:40:16 PDT 2015
On 04/17/2015 05:16 AM, Carlos Garnacho wrote:
> Let's expand on that example, maybe far-streched, but certainly possible:
> - I'm manipulating a client window with 2 fingers on the touchscreen
> (say zooming an image)
> - Any other interaction on the client makes it pop up an xdg_popup
> (say a third touch, a key combo, or the pointer)
> - Q: what happens with the two first touches?
The touches held down should continue to go to the surface they were
going to before, while the events related to the event that triggered
the grab will go to the grab client.
When the two touches are fully released then the next press of them will
go to the grab client.
Wayland could guarantee that the release and drag events go to the same
client that got the press event. Grabs just dictate where new press
I don't think this situation will happen much, due to server-induced
grabs which are fully synchronous, so you cannot press two buttons in
two different widgets and get two grabs. Instead one of them will get
the grab and that one will see the other button.
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