libinput: Disable tap-and-drag

[Caibin Chen]

The reason why it's annoying to me is that often time I tap something and
move the cursor immediately. For example closing a browser tab then move
back to the content. This triggers tap-and-drag unexpectedly.

As of dragging without clicking the touchpad, I have a WIP branch adding
three-finger-to-drag feature[1]. You just drag with three fingers, no
tapping needed. I've been testing it for a while.

[1].
https://github.com/tigersoldier/libinput/tree/wip/three-fingers-dragging

Peter Hutterer <peter.hutterer at who-t.net>于2016年1月3日周日 下午10:40写道：

> On Sat, Jan 02, 2016 at 04:02:29AM +0000, Caibin Chen wrote:
> > Hi,
> >
> > I've been working on disabling tap-and-drag feature in libinput because
> I'm
> > not used to it. The code is on my Github branch:
> > https://github.com/tigersoldier/libinput/tree/wip/disable-tap-to-drag
> >
> > The basic idea is adding a branch at STATE_TOUCHED + EVENT_RELEASE
> > transition:
> >
> >    STATE_TOUCHED
> >          |
> >          |
> >    EVENT_RELEASE
> >          |
> >          |
> >          v
> > tap-and-drag enabled?  --- yes ---> (unchanged)
> >          |
> >          no
> >          |
> >          v
> >     button press
> >     button release
> >          |
> >          v
> >     STATE_IDLE
> >
> > Aside from disabling the feature, this reduces the tapping latency as
> well,
> > because we don't have to wait for the timeout for STATE_IDLE to
> > STATE_DRAGGING_OR_DOUBLE_TAP/STATE_IDLE transition.
> >
> > What do you guys think? If this makes sense, I can work on the
> > documentation and tests and send patches to the list.
>
> thanks for doing this work. tbh, I'm not a big fan of having this as a
> configuration option. IMO if you are using tapping as an interaction method
> on the touchpad, having tap-and-drag available is the natural extension and
> I don't see why we should disable it. Without it, a user would have to
> physically click the touchpad and move with a second finger, despite
> otherwise using tapping as the clicking interaction. That seems disjointed.
> And while I can see that this is what some people do (I use tapping and
> clicking interchangeable), I don't really want to provide/maintain/test
> configuration options for this. sorry.
>
> Cheers,
>    Peter
>
>
>
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