On Wed, Oct 06, 2010 at 12:30:46PM -0700, Ping Cheng wrote: > On Wed, Oct 6, 2010 at 6:51 AM, Chase Douglas > <[email protected]> wrote: > > > > If I remember correctly, actively grabbed events cannot be replayed. > > Only passively grabbed events. Since passively grabbed events must start > > within a particular window, this scenario will never occur. > > > > I suggest reading the XI protocol specifications and the X core protocol > > specification, where the semantics and details of input grabbing are > > discussed: > > Chase, you are right. I have messed up the master/core and > passive/slave in my explanation. I need to get the terms and semantics > right before I can comment more (that would take some time).
master: virtual device representing either cursor or keyboard focus slave: physical device (in most cases) core: device that can send core events. term is essentially deprecated, think of a master device as a core device. (slaves can never send core events). best to not use the term anymore, see also "core event" core event: core X protocol event sent down the wire. passive grab: grab activated when a button/key combination is pressed on a particular window. clients need to register a passive grab once, then will activate repeatedly until ungrabbed. passive grabs terminate automatically when the button/key is released active grab: grab activated immediately on request by the client, terminates when client ungrabs or disconnects. That about sums it up, I think :) Cheers, Peter > What I wanted to make clear was: > > The spec and implementation need to > > 1. provide an easy way for toolkits/client to support the most > popular/used MT features, such as basic gestures; > 2. leave rooms for sophisticated MT toolkits/apps/clients to grow. > > For item 1, a smooth transition from XI (single touch events) to > XI2.1, and vice versa, has to be carefully considered, with the > posibility to turn XI or/and XI2.1 report/events off. Active and > passive grabbing has to be tracked and probably managed. I am not > exactly sure at which level though. I would think it is in X server? > > For item 2, I would think those sophisticated MT apps will occupy the > whole desktop, i.e., there is only one MT app running and all MT > events can only reach that app. So, there would be no competition or > inconsistence there. > > KISS is the rule that I always remind myself and others in my group to > consider. > > Ping _______________________________________________ Mailing list: https://launchpad.net/~multi-touch-dev Post to : [email protected] Unsubscribe : https://launchpad.net/~multi-touch-dev More help : https://help.launchpad.net/ListHelp
