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doc: add an entry about tablets in left-handed mode

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Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Peter Hutterer 2016-05-09 11:13:55 +10:00
parent 3ff302694e
commit 87550f8dc9
2 changed files with 500 additions and 0 deletions
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31
doc/tablet-support.dox
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@ -245,4 +245,35 @@ caller and libinput does not provide specific handling. Callers should use
external sources like libwacom to identify which buttons have semantic
behaviors.
@section tablet-left-handed Tablets in left-handed mode
Left-handed mode on tablet devices usually means rotating the physical
tablet by 180 degrees to move the tablet pad button area to right side of
the tablet. When left-handed mode is enabled on a tablet device (see
libinput_device_config_left_handed_set()) the tablet tool and tablet pad
behavior changes. In left-handed mode, the tools' axes are adjusted
so that the origin of each axis remains the logical north-east of
the physical tablet. For example, the x and y axes are inverted and the
positive x/y coordinates are down/right of the top-left corner of the tablet
in its current orientation. On a tablet pad, the ring and strip are
similarly adjusted. The origin of the ring and strips remain the top-most
point.
@image html tablet-left-handed.svg "Tablet axes in right- and left-handed mode"
Pad buttons are not affected by left-handed mode; the number of each button
remains the same even when the perceived physical location of the button
changes. This is a conscious design decision:
- Tablet pad buttons do not have intrinsic semantic meanings. Re-ordering
the button numbers would not change any functionality.
- Button numbers should not be exposed directly to the user but handled in
the intermediate layers. Re-ordering button numbers thus has no
user-visible effect.
- Re-ordering button numbers may complicate the intermediate layers.
Left-handed mode is only available on some tablets, some tablets are
symmetric and thus do not support left-handed mode. libinput requires
libwacom to determine if a tablet is capable of being switched to
left-handed mode.
*/