the OLPC XO grab button (triggering mouse scrolling using a keypress)

[Erik Garrison <erik@xxxxxxxxxx>]

Xorg-land,

I'm working on implementing a feature for the OLPC XO-1 laptop
(http://dev.laptop.org/ticket/447).

The keyboard has two buttons which are marked with a hand.  The
interested may see a schematic at
http://wiki.laptop.org/go/OLPC_Keyboard_layouts.  It was intended at
design time that pressing either of these buttons (Super_L and Super_R)
and simultaneously moving the mouse would trigger x and y scrolling in
X11 applications.

I'm curious if anyone knows of ways in which similar functionality has
been implemented elsewhere.  In general I'd like some advice about the
best place to implement this feature.

Thanks in advance,
Erik
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