the OLPC XO grab button (triggering mouse scrolling using a keypress)
peter.hutterer at who-t.net
Mon Jun 30 23:22:09 PDT 2008
On Mon, Jun 30, 2008 at 07:35:16PM -0400, Erik Garrison wrote:
> 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.
Just put a passive grab on the keys to receive the key press event and then,
depending on what you mean by scrolling:
- mouse wheel emulation
put a (sync) grab on the mouse and use XTestFakeButtonEvent on buttons
4/5/6/7 for to scroll. you'll need to mess around a bit with XAllowEvents,
but it should work.
- viewport scrolling
XWarpPointer seems the only way, I don't see any other callers for
xf86SetViewport that could be used directly.
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