Kinetic scroll in libinput Xorg driver

[Christian Stroetmann]

On 26.10.2016 08:57, Alexis BRENON @Wayland wrote:

@Raster: Thank you for your reminder.

Maybe Enlightenment with Tiling2 and kinetic scrolling is already what 
you need.

If I remember correctly I3 (www.i3wm.org)<http://i3wm.org/> might work 
together with Wayland as well.

In general, I have seen at all major toolkits transistion efforts to 
Wayland since around 2 years. Some have matured while others are 
experimental so to say.



Best Regards
Christian Stroetmann

> Just to be sure that I understand clearly, what you call 'Toolkit' is 
> libraries like GTK, Qt, and co. that are used by developers to build 
> their apps, isn't it ?
>
> Finally, do you know some tiling DE/WM Wayland compliant ?
>
> Kind,
> Alexis.
>
> Le mer. 26 oct. 2016 à 02:17, Carsten Haitzler <raster at rasterman.com 
> <mailto:raster at rasterman.com>> a écrit :
>
>     On Mon, 24 Oct 2016 18:42:31 +0000 "Alexis BRENON @Wayland"
>     <brenon.alexis
>     +wayland at gmail.com <mailto:wayland at gmail.com>> said:
>
>     > Hello everyone,
>     >
>     > I would like to implement kinetic scroll in the libinput driver
>     for Xorg.
>     >
>     > I know that it's probably not the intended use of libinput ; as
>     explained
>     > in the documentation, it's the client that have to manage that.
>     >
>     > However, as an Xorg user not happy with the synaptics driver, I
>     would like
>     > to add a similar feature (fixing small disagreements encountered
>     with
>     > synaptics) to libinput, allowing Xorg users to easily move to
>     libinput
>     > without losing this feature.
>     >
>     > My first idea is to implement the kinetic scroll using a thread
>     that sends
>     > axis events as long as there is no button event, key event or
>     motion event
>     > higher than a threshold.
>     >
>     > It makes some time since the last time I developed in C, and
>     maybe it's not
>     > the better way to do it. I would be happy to hear your advices.
>     >
>     > One thing I'm thinking of is then to add some options in the Xorg
>     > configuration file to enable/disable this feature, choose the events
>     > stopping the kinetic scroll and change some thresholds. This
>     will allow to
>     > easily disable this feature in the future in case the clients
>     manage the
>     > kinetic scroll on their own.
>     >
>     > What do you think of this? Is there someone already working on
>     it? Is my
>     > proposition a good way to implement it?
>     >
>     > Thanks for your attention.
>     >
>     > Kind regards,
>     > Alexis BRENON.
>
>     we already do kinetic scrolling higher up in the toolkit. we do
>     acceleration
>     using these events and we do smooth animated scrolling in our
>     scroller and not
>     just stepping, as well as momentum as we slid with bouncing at the
>     ends. it's
>     already done in toolkit out of the box. if you try and hack this
>     in at the
>     input layer this simply doubles the amount of this and likely
>     makes the user
>     experience worse. this would have to be off by default and if it's
>     off by
>     default... you need ways of turning it on client by client ... and
>     even then
>     there are a pile of other problems you'll hit. so my suggestion is
>     - don't. add
>     to your favorite toolkits instead if they don't have it. they have
>     far more
>     information about the context at the time and the use cases needed
>     etc.
>
>
>
>     --
>     ------------- Codito, ergo sum - "I code, therefore I am"
>     --------------
>     The Rasterman (Carsten Haitzler) raster at rasterman.com
>     <mailto:raster at rasterman.com>
>
>
>
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