/
backlight.py
71 lines (59 loc) · 2.24 KB
/
backlight.py
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import cairo
import os
from libqtile import bar, manager
import base
BACKLIGHT_DIR = '/sys/class/backlight'
FORMAT = '{percent:2.0%}'
class Backlight(base._TextBox):
"""
A simple widget to show the current brightness of a monitor.
"""
filenames = {}
defaults = manager.Defaults(
('font', 'Arial', 'Text font'),
('fontsize', None, 'Font pixel size. Calculated if None.'),
('padding', 3, 'Padding left and right. Calculated if None.'),
('background', None, 'Background colour.'),
('foreground', '#ffffff', 'Foreground colour.'),
('backlight_name', 'acpi_video0', 'ACPI name of a backlight device'),
('brightness_file', 'brightness', 'Name of file with the '
'current brightness in /sys/class/backlight/backlight_name'),
('max_brightness_file', 'max_brightness', 'Name of file with the '
'maximum brightness in /sys/class/backlight/backlight_name'),
('update_delay', .2, 'The delay in seconds between updates'),
)
def __init__(self, width=bar.CALCULATED, **config):
base._TextBox.__init__(self, "LIGHT", **config)
def _configure(self, qtile, bar):
base._TextBox._configure(self, qtile, bar)
self.timeout_add(self.update_delay, self.update)
def _load_file(self, name):
try:
path = os.path.join(BACKLIGHT_DIR, self.backlight_name, name)
with open(path, 'r') as f:
return f.read().strip()
except IOError:
return False
except Exception:
self.log.exception("Failed to get %s" % name)
def _get_info(self):
try:
info = {
'brightness': float(self._load_file(self.brightness_file)),
'max': float(self._load_file(self.max_brightness_file)),
}
except TypeError:
return False
return info
def _get_text(self):
info = self._get_info()
if info == False:
return 'Error'
percent = info['brightness'] / info['max']
return FORMAT.format(percent=percent)
def update(self):
ntext = self._get_text()
if ntext != self.text:
self.text = ntext
self.bar.draw()
return True