On Sat, 2010-10-09 at 13:49 +0200, Henrik Rydberg wrote: > On 10/09/2010 01:07 PM, Peter Hutterer wrote: > >>> Plus, the roundtrip issue of sending events to the recogniser who sends > >>> some of > >>> them back before you can send them to the clients. > >> > >> > >> Right, provided the recognition is placed on the client side. > > > > wait, what? I'm not sure I read this comment correctly. > > > Hehe. Point being that no particular problem is being solved by moving > context-independent gesture recognition to the client side.
If I've read the rest of this thread correctly, it feels like Henrik is advocating for splitting the gesture stack into a recognizer in X and an instantiator on the client side. The issue I see here is that you still need the context that only exists client side in order to perform gesture recognition. Take the case of what looks like a three finger pinch where two fingers are over one object in a window and the third is over another object. Imagine the two-fingered object is a scrollable region, and the single-fingered object is a toolbar button above the scrollable region. Now, you move the two fingers up to scroll. This looks like a three finger pinch, but it's really a two finger drag. The recognizer would have to enumerate all the possibilities of gestures depending on which fingers are part of a possible gesture, and this becomes exponentially difficult as the number of fingers increases. Thus, we can only perform recognition after we know which fingers are part of a gesture, and we can only do that with the knowledge available on the client side. -- Chase _______________________________________________ Mailing list: https://launchpad.net/~multi-touch-dev Post to : multi-touch-dev@lists.launchpad.net Unsubscribe : https://launchpad.net/~multi-touch-dev More help : https://help.launchpad.net/ListHelp
