linux - Use USB numeric keypad with phone-like typing?

Monday 12 February 2018

I have USB numeric keypad like this:

I need to write chars (A to Z) on this keyboard, and so my idea is to use it like on old cell phone:

enter image description here

If I press 1x 2 it writes A, 2x 2 - B, 4x 9 - Z, etc.

Is possible to do it? And how? Using udev?

Answer

Solution is use multipress input method.

In app is need to set multipress input method manually. If you want have multipress as default you need to create file /.xinputrc with content:

GTK_IM_MODULE=multipress
QT_IM_MODULE=multipress

Notes