On 03/01/2010 01:55 PM, ext Daniel Stone wrote:
I don't really see the conceptual difference between multiple devices and multiple axes on a single device beyond the ability to potentially deliver events to multiple windows. If you need the flexibility that multiple devices offer you, then just use multiple devices and make your internal representation look like a single device with multiple axes.
This is where the context confusion comes in. How do we know what the user(s) is/are trying to do solely based on a set of x/y/z/w/h coordinates? In some cases, a single device with multiple axes is enough, but in other cases it is not.
On a side note, I have a feeling this is why things like the iPhone/iPad are full-screen only, and Windows 7 is single-window multi-touch only.
Given that no-one's been able to articulate in much detail what any other proposed solution should look like or how it will actually work in the real world, I'm fairly terrified of it. Can you guys (Bradley, Peter, Matthew) think of any specific problems with the multi-layered model? Usecases as above would be great, bonus points for diagrams. :)
I'm concerned about the event routing and implicit grabbing behaviour, specifically. I don't know enough about the internals to really put my concerns into words or link to code in the server.
Use-cases? Collaboration is the main use-case. Class rooms, meeting rooms, conferences are ones that I often think about. Think about the GIMP having multi-user and multi-touch support so that art students could work together on a multi-touch table top. I think the MS Surface marketing videos are a good indication of what could be done as well.
One thing that we definitely want is for normal button and motion events for one of the active touch-points over a client window. As Peter pointed out, we shouldn't have to rewrite the desktop to support multi-touch. In addition to specialized applications like I described above, we definitely want "normal" applications to remain usable in such an environment (I can definitely see someone bringing up a terminal and/or code editor just for themselves to try out an idea that they get while in a meeting).
(Sorry for the lack of diagrams, my ascii-art kung-fu is non-existent. How about a video? http://vimeo.com/4990545)
-- Bradley T. Hughes (Nokia-D-Qt/Oslo), bradley.hughes at nokia.com Sandakervn. 116, P.O. Box 4332 Nydalen, 0402 Oslo, Norway _______________________________________________ xorg-devel mailing list xorg-devel@lists.x.org http://lists.x.org/mailman/listinfo/xorg-devel
