Tuesday, March 22, 2011

Custom input device configuration in GNOME

Thanks largely to Bastien, Gnome Bug 635486 just got committed, in time for GNOME3.

It adds is the ability for custom configuration of input devices from within GNOME, especially for settings that are not handled by the GNOME UI tools. It's principle is quite simple. A new gsettings key hotplug-command in the org.gnome.settings-daemon.peripherals.input-devices schema points to an executable. This executable is called at gnome-settings-daemon startup, whenever a device has been added and whenever a device has been removed. Something like this:

$HOME/executable -t added -i 12 My device name

So the device with the ID 12 and the name "My device name" just got added. Other types are "removed" and "present" for those device that are already present when g-s-d starts up. It's quite simple to configure any device to your liking now. Have a look at the input-device-example.sh script shipped with gnome-settings-daemon. I'll give you two examples of what you could add to the script and the rest should be easy enough to figure out:

# Map stylus button 1 to button 8
if [ "$device" = "Wacom Intuos4 6x9 stylus" ]; then
xsetwacom set "$device" Button 1 8

# map tapping to LMR instead of default LRM
if [ "$device" = "SynPS/2 Synaptics TouchPad" ]; then
xinput set-prop $id "Synaptics Tap Action" 0 0 0 0 1 2 3

1 comment:

eparis said...

So I was pretty stupid and took me a second to figure out how to set the key. Anyone else who stumbles onto this:

gsettings set org.gnome.settings-daemon.peripherals.input-devices hotplug-command '$HOME/bin/script.sh'

Also note that you probably want to use "$device" (with the "") in your scripts (as in the example). I forgot the "" and wondered why it wasn't matching.