On Sat, Sep 29, 2012 at 12:01 PM, Scott Moreau <ore...@gmail.com> wrote: > >> >> Ok, so what I'm trying to do is to enable what people call "smooth >> scrolling" on an input level, meaning that scrolling is not based on >> discrete arbitrary "steps" but on a more fluid motion. These types of >> events makes most sense for certain types of step-less scroll wheels >> and touchpads and I'll try to explain why. >> >> When axis events are discrete steps, there is indeed little need to >> relate to any kind of coordinate space except knowing what is "up" and >> what is "down". A step can only be 1 or -1, thats it. This is how it >> traditionally works in X11 (except XI2 I think supports non-discrete >> axis events). >> >> If one wants to have axis events that more resemble smooth motions, >> such as the ones emitted by those step-less scroll wheels or >> touchpads, one needs to specify what the events actually mean, since >> they are no longer only limited to 1 and -1. To do this, if we specify >> an axis event to be a vector along an axis in a coordinate space >> identical to motion events, we can create axis events that relate to >> some measurement already known to both the compositor and client. A >> step-less scroll wheel would transform its scroll events to a motion >> vector measured in pixels and a touchpad would simply emit an axis >> event as it would emit a motion event when scrolling. A client could >> then read these events and can scroll its view by that amount of >> pixels specified by the value parameter. >> >> Jonas > > > > This makes it much clearer. I saw there was some discussion in IRC a few > days ago too. Perhaps you could put the key points you've made here, in the > protocol description. I guess the only thing is now, evdev needs fixing to > emit the same expected format.
Sure, I'll submit another patch with more description, and another one updating evdev according to Pekka's evdev output. Thanks for the input; much appreciated. Jonas _______________________________________________ wayland-devel mailing list wayland-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/wayland-devel
