On Tue, Jun 12, 2012 at 11:25:08AM +1000, Peter Hutterer wrote: > On Mon, Jun 04, 2012 at 06:50:47PM -0400, Paul Vojta wrote:
[snip] > > So I would need to keep track of EnterNotify events for each window for > > which I'm doing smooth scrolling, and set a flag each time such an event > > is received. > > yes, this is a bug in the protocol and that behaviour is what GTK has to do > as well. > http://who-t.blogspot.com.au/2012/06/xi-21-protocol-design-issues.html Thanks very much for that reference -- it's very helpful. > > A problem with this (other than the extra programming effort required) > > is that on four-button Synaptics touchpads, the first button press of > > the third or fourth button after returning to the xdvi window would > > (I think) have no effect anymore. (More generally, the first scrolling > > distance would be ignored for every return to the window, but would not > > be noticeable unless it was produced by a button press or simulated button > > press.) > > > > Is this correct? > > are you talking about the touchpads that have separate scroll buttons? I'd > not worry too much about those, I think even the newest ones are several > years old now (to the point that the next version of synaptics won't support > the scroll buttons anymore). Yes, but also things like RTCornerButton=4, etc. Also, what happens if you have a traditional wheel mouse in addition to a touchpad? > > And, more to the point, is there some way by which I could just receive the > > deltas of the scrolling valuators for when the pointer is in the designated > > window? > > you can't really get the deltas only, you'll always have to calculate them > from the previous value. your only option for not skipping the first event > is to run XIQueryDevice after an EnterEvent to get the current value on the > valuator so you can use that first event with that delta. Of course, that is > prone to race conditions so you have to work around them too. OK, thanks. > sorry :( Any plans to change the spec anytime soon (e.g., for X11R7.8 or XI 2.3)? --Paul Vojta, vo...@math.berkeley.edu _______________________________________________ xorg@lists.x.org: X.Org support Archives: http://lists.freedesktop.org/archives/xorg Info: http://lists.x.org/mailman/listinfo/xorg Your subscription address: arch...@mail-archive.com
