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libinput.el/touchgrid.el

This Emacs library divides the screen into zones and executed actions when those zones are touched. This is done by parsing the output from the libinput tools.

For a video demostration, see this https://lars.ingebrigtsen.no/2018/08/07/innovations-in-emacs-touch-interfacing/ blog post.

Getting Started

This isn't a turnkey solution package: It's more of a framework that has a bunch of example actions (i.e., the ones I'm using to control my specific touch-screen/Emacs video browser/mpv player). To use this, you have to understand Emacs Lisp and hack a bit, but the general framework should be sound. Soundish.

It should work under both Wayland and X, but you need a rather recent Emacs.

Prerequisites

On Ubuntu, your user needs to be in the input group to be able to access the events.

$ sudo adduser `whoami` input

We also need programs to parse the inputs and do various actions:

$ sudo apt install libinput-tools xdotool onboard qiv

The main idea is to define a grid (how detailed is you to you) and fill in the actions you want to have happen. Here's a grid of actions for a video player:

(backward-1m backward-10s pause forward-10s forward-1m)
(backward-1m backward-10s pause forward-10s forward-1m)
(none        none         quit  none        none      ) 
(grid        none         pause none        none      )
(keyboard    none         pause none        show-progress)

When you tap on the "pause" box, the touchgrid--pause function will be called, which should then do whatever's needed to pause the video player. A likely command would be to use xdotool to focus the player and then send it a SPC command, or whatever the video player uses.

The touchgrid.el file has a bunch of commands that I use for an Emacs-based video browser that then calls mpv and communicates over the mpv command socket. See https://github.com/larsmagne/movie.el for details.

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Control Emacs by reading libinput events

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