Bug 92834 - Add 3-finger pinch support
Summary: Add 3-finger pinch support
Alias: None
Product: Wayland
Classification: Unclassified
Component: libinput (show other bugs)
Version: unspecified
Hardware: Other All
: medium normal
Assignee: Peter Hutterer
QA Contact:
Depends on:
Reported: 2015-11-05 12:46 UTC by Bastien Nocera
Modified: 2016-01-22 02:20 UTC (History)
2 users (show)

See Also:
i915 platform:
i915 features:


Description Bastien Nocera 2015-11-05 12:46:20 UTC
Bug 85881 only implemented 2-finger pinch. I'd like to be able to have 3-finger pinch getting to the overview on my touchpad, as it does on touchscreens.
Comment 1 Caibin Chen 2016-01-06 07:01:35 UTC
Maybe we can use the same strategy as 2fg pinch. Just detect swipe by checking the moving directions of all fingers. Non-swipe gestures are always considered as pinch.
Comment 2 Peter Hutterer 2016-01-08 04:03:01 UTC
There's a big problem with 3-finger pinch gestures that we'll face on many touchpads, particularly the current synaptics generation: we sometimes can't tell the difference between a swipe and a pinch gesture. Unless the thumb is placed down as first or second finger, we won't get positional information and the data stream from a three-finger swipe and three-finger pinch is identical.

Until we get RMI4 over SMBus in the kernel, this will be a problem.
Comment 4 Peter Hutterer 2016-01-22 02:20:08 UTC
commit a4adea1646606cd386015ecf13391af3a2a0ccd5
Merge: 82335b0 cab2c16
Author: Peter Hutterer <peter.hutterer@who-t.net>
Date:   Wed Jan 20 15:38:17 2016 +1000

    Merge branch 'wip/3-finger-pinch-gesture'

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