diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/Makefile.am | 1 | ||||
| -rw-r--r-- | doc/palm-detection.dox | 28 | ||||
| -rw-r--r-- | doc/svg/thumb-detection.svg | 116 |
3 files changed, 145 insertions, 0 deletions
diff --git a/doc/Makefile.am b/doc/Makefile.am index 95a96e45..ddda230b 100644 --- a/doc/Makefile.am +++ b/doc/Makefile.am @@ -39,6 +39,7 @@ diagram_files = \ $(srcdir)/svg/pinch-gestures.svg \ $(srcdir)/svg/swipe-gestures.svg \ $(srcdir)/svg/tap-n-drag.svg \ + $(srcdir)/svg/thumb-detection.svg \ $(srcdir)/svg/top-software-buttons.svg \ $(srcdir)/svg/touchscreen-gestures.svg \ $(srcdir)/svg/twofinger-scrolling.svg diff --git a/doc/palm-detection.dox b/doc/palm-detection.dox index d787455e..1a5e6572 100644 --- a/doc/palm-detection.dox +++ b/doc/palm-detection.dox @@ -80,4 +80,32 @@ Notable behaviors of libinput's disable-while-typing feature: - Physical buttons work even while the touchpad is disabled. This includes software-emulated buttons. +@section thumb-detection Thumb detection + +Many users rest their thumb on the touchpad while using the index finger to +move the finger around. For clicks, often the thumb is used rather than the +finger. The thumb should otherwise be ignored as a touch, i.e. it should not +count towards @ref clickfinger and it should not cause a single-finger +movement to trigger @ref twofinger_scrolling. + +libinput uses two triggers for thumb detection: pressure and +location. A touch exceeding a pressure threshold is considered a thumb if it +is within the thumb detection zone. + +@note "Pressure" on touchpads is synonymous with "contact area", a large +touch surface area has a higher pressure and thus hints at a thumb or palm +touching the surface. + +Pressure readings are unreliable at the far bottom of the touchpad as a +thumb hanging mostly off the touchpad will have a small surface area. +libinput has a definitive thumb zone where any touch is considered a resting +thumb. + +@image html thumb-detection.svg + +The picture above shows the two detection areas. In the larger (light red) +area, a touch is labelled as thumb when it exceeds a device-specific +pressure threshold. In the lower (dark red) area, a touch is labelled as +thumb if it remains in that area for a time without moving outside. + */ diff --git a/doc/svg/thumb-detection.svg b/doc/svg/thumb-detection.svg new file mode 100644 index 00000000..bc746981 --- /dev/null +++ b/doc/svg/thumb-detection.svg @@ -0,0 +1,116 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> +<!-- Created with Inkscape (http://www.inkscape.org/) --> + +<svg + xmlns:dc="http://purl.org/dc/elements/1.1/" + xmlns:cc="http://creativecommons.org/ns#" + xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" + xmlns:svg="http://www.w3.org/2000/svg" + xmlns="http://www.w3.org/2000/svg" + xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd" + xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape" + width="89.829216mm" + height="59.06765mm" + viewBox="0 0 318.2925 209.29482" + id="svg4184" + version="1.1" + inkscape:version="0.91 r13725" + sodipodi:docname="thumb-detection.svg"> + <defs + id="defs4186" 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