Bug 90526

Summary: Allow left-clicks during 2fg clickfinger
Product: Wayland Reporter: Peter Hutterer <peter.hutterer>
Component: libinputAssignee: Wayland bug list <wayland-bugs>
Status: RESOLVED FIXED QA Contact:
Severity: normal    
Priority: medium CC: peter.hutterer
Version: unspecified   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:
Bug Depends on: 90528    
Bug Blocks: 90261    

Description Peter Hutterer 2015-05-20 05:10:08 UTC 
Follow-up from Bug 90261.

If clickfinger is enabled, two fingers on the touchpad cause a right click. In some cases, this is the wrong thing to do. e.g. moving the cursor with an index finger, then clicking with a thumb at the bottom of the touchpad.

Observations from OS X:
* a thumb press is ignored for the finger count, so thumb + 1 fg -> left, thumb + 2fg -> right
* for two fingers, if they're too far apart only a single finger click is triggered
* there appears to be either some zone at the bottom of the pad or some timeout so that sometimes using second finger to click won't trigger a right click. Couldn't figure out what the exact conditions were here.

Not sure what the exact distances are, they seem to change with the vertical difference - East-West it's about 5-6cm, North-South it's closer to 3-4, anything else is somewhere in between.
Comment 1 Peter Hutterer 2015-06-03 05:53:18 UTC 
patchset starting here: http://lists.freedesktop.org/archives/wayland-devel/2015-June/022417.html
Comment 2 Peter Hutterer 2015-06-04 00:01:57 UTC 
commit df83144457176e454953d2a580a8f28e73f4a677
Author: Peter Hutterer <peter.hutterer@who-t.net>
Date:   Wed Jun 3 12:15:51 2015 +1000

    touchpad: impose maximum distance limits on clickfingers


and the follow-up:


commit 8af1f4b08536ca2d74950026eb4d210142dbf6fc
Author: Peter Hutterer <peter.hutterer@who-t.net>
Date:   Wed Jun 3 14:27:43 2015 +1000

    touchpad: on non-resolution touchpads, use 30% as maximum clickfinger spread

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