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add stylus-in-range explanation to documentation

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Jarrad Whitaker 2015-11-27 23:58:38 +11:00
parent 0663ea37e6
commit 91c417b35e
1 changed files with 9 additions and 0 deletions
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doc/protocol.txt
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@ -29,3 +29,12 @@ Packet structure, uses network byte order (big endian):
0 button is released ("up")
1 button is pressed ("down")
XInput will ignore BTN_TOUCH events if they are not preceeded by
a BTN_TOOL_PEN event -- this would never happen for a real stylus,
because it would imply the stylus is touching the pad, yet too far
away from the pad to be detected.
A GfxTablet client must therefore be careful to send a "Button -1
down" event before a "Button 0 down" event, to emulate this
behaviour. If they are faking these events, they'll probably want
to likewise send a "Button -1 up" event after a "Button 0 up" event.