First commit

main
Fabio Manganiello 8 months ago
parent d6f811c061
commit c0d30084d7
  1. 8
      README.md
  2. 64
      bin/cutiepi-button-handler
  3. 19
      systemd/cutiepi-button-handler.service

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# cutiepi-button-handler
Simple button handling service for the CutiePi button events
This script handles button press events on a CutiePi tablet and toggles the display on/off upon pressure.
## Installation
Just copy `bin/cutiepi-button-handler` somewhere in your `PATH` (default: `~/bin`) and start it. Button support should work out of the box.

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#!/usr/bin/env python
import os
import re
import subprocess
from gi.repository import GLib
from dbus import SessionBus
from dbus.mainloop.glib import DBusGMainLoop
previous_xrandr = 'xrandr --output DSI-1 --auto'
def get_current_xrandr() -> str:
proc = subprocess.Popen(['unxrandr'], stdout=subprocess.PIPE)
return proc.communicate()[0].decode().strip()
def is_display_on() -> bool:
proc = subprocess.Popen(['xrandr', '-q'], stdout=subprocess.PIPE)
out = proc.communicate()[0].decode().strip()
lines = [
line for line in out.split('\n')
if line.startswith('DSI-1 ')
]
assert lines, 'Display DSI-1 not found'
m = re.search(r'^DSI-1\s+(connected\s+)?(primary\s+)?\d+x\d+\+\d+\+\d+', lines[0])
return m is not None
def signal_handler(name, value):
global previous_xrandr
if name != 'button':
return
is_on = is_display_on()
if is_on:
previous_xrandr = get_current_xrandr()
os.system('xrandr --output DSI-1 --off')
else:
os.system(previous_xrandr)
def main():
xrandr = get_current_xrandr()
loop = DBusGMainLoop()
bus = SessionBus(mainloop=loop)
bus.add_signal_receiver(
signal_handler, 'updateEvent',
'io.cutiepi.interface', path='/mcu'
)
loop = GLib.MainLoop()
try:
loop.run()
finally:
loop.quit()
if __name__ == '__main__':
main()

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# Copy or symlink this systemd service to ~/.config/systemd/user
# (create the folder if it doesn't exist).
# Start with: systemctl --user start cutiepi-button-handler
# Stop with: systemctl --user stop cutiepi-button-handler
# Enable at startup with: systemctl --user cutiepi-button-handler
# Disable at startup with: systemctl --user cutiepi-button-handler
[Unit]
Description=Manage screen on/off logic upon button press on the CutiePi
After=graphical.target
[Service]
ExecStart=/home/pi/bin/cutiepi-button-handler
Restart=always
RestartSec=5
[Install]
WantedBy=default.target
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