[Wayland-bugs] [Bug 89999] Add support for 3-finger dragging

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89999

--- Comment #3 from Hans de Goede <jwrdegoede at fedoraproject.org> ---
(In reply to Peter Hutterer from comment #2)
> couple of question here, can we do something with a timeout? i.e. three
> fingers down + timeout X switches to drag motion, otherwise the swipe
> triggers.

Yes that is possible, do we want to handle this in gestures.c or in tap.c
though, I've a feeling it belongs in tap.c. because we do not want the
following sequence to trigger it:

Finger 1 down
Finger 1 moves over tap threshold
Fingers 2 + 3 down
Timeout

Where as having it in the gesture code would lead to the timeout eventually
activating 3 finger mode, and then if more time is passed before moving, switch
to 3fg drag-n-drop. I guess one could argue that is desirable behavior, and in
that case this is easy to implement in the gesture code, esp. since the tap
statemachine already is too complicated IMHO.

> we don't have any movement restrictions on swipe motions atm, right?
> anything is a swipe once 3 fingers are down, so maybe we should add
> restrictions to horizontal/vertical swiping here?

I've deliberately not added any limits as I've seen e.g. usb-touchpads with
firmware handled gestures which have diagonal swipes, so I would rather leave
any direction locking up to the user.

> once of the drawbacks of having this via gestures if of course that we need
> both the compositor (for cursor movement) and the toolkits to support this.
> that's the upside too though I guess, it makes context-specific interaction
> more doable than emulating it in libinput.

Ack.

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