Python script, ASCII text executable
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"""
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Screen brightness control applet for the Panorama panel.
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Copyright 2025, roundabout-host.com <vlad@roundabout-host.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public Licence as published by
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the Free Software Foundation, either version 3 of the Licence, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public Licence for more details.
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You should have received a copy of the GNU General Public Licence
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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"""
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import os
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import panorama_panel
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import pydbus
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import locale
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from pathlib import Path
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from pyudev import Context, Monitor, MonitorObserver
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import gi
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gi.require_version("Gtk", "4.0")
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from gi.repository import Gtk, GLib, Gio
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module_directory = Path(__file__).resolve().parent
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locale.bindtextdomain("panorama-panel-file-listing", module_directory / "locale")
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_ = lambda x: locale.dgettext("panorama-panel-file-listing", x)
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def open_file_and_read_int(path: Path):
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with open(path) as f:
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return int(f.read().strip())
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class ScreenBrightness(panorama_panel.Applet):
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name = _("Brightness")
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description = _("Control display brightness")
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def __init__(self, orientation=Gtk.Orientation.HORIZONTAL, config=None):
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super().__init__(orientation=orientation, config=config)
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if config is None:
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config = {}
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self.icon = Gtk.Image.new_from_icon_name("display-brightness-symbolic")
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self.icon.set_pixel_size(config.get("icon_size", 24))
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self.button = Gtk.MenuButton(child=self.icon, has_frame=False)
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self.append(self.button)
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self.popover = Gtk.Popover()
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self.box = Gtk.Box()
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self.popover.set_child(self.box)
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self.button.set_popover(self.popover)
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self.bus = pydbus.SystemBus()
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self.login1 = self.bus.get("org.freedesktop.login1", "/org/freedesktop/login1")
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self.manager = self.bus.get("org.freedesktop.login1", "/org/freedesktop/login1")
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self.session = self.bus.get("org.freedesktop.login1", self.manager.GetSessionByPID(os.getpid()))
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self.backlights = [path for path in Path("/sys/class/backlight").iterdir()]
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if not self.backlights:
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self.button.hide()
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self.adjustments = {}
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self.sessions = self.manager.ListSessions()
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self.udev_context = Context()
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self.monitor = Monitor.from_netlink(self.udev_context)
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self.monitor.filter_by(subsystem="backlight")
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self.observer = MonitorObserver(self.monitor, callback=self.process_notify)
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self.observer.start()
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self.update_backlights()
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def process_notify(self, device):
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# Called when the brightness is updated in any way, even externally
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path = Path("/sys/class/backlight") / device.sys_name
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adjustment = self.adjustments.get(path)
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value = open_file_and_read_int(path / "brightness")
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if not adjustment:
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return
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def update():
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adjustment.handler_block(adjustment.handler_id)
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adjustment.set_value(value)
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adjustment.handler_unblock(adjustment.handler_id)
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return False
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GLib.idle_add(update)
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def update_backlights(self):
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for backlight in self.backlights:
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max_brightness = open_file_and_read_int(backlight / "max_brightness")
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current_brightness = open_file_and_read_int(backlight / "brightness")
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adjustment = Gtk.Adjustment(lower=0, upper=max_brightness, value=current_brightness)
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adjustment.backlight = backlight
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self.adjustments[backlight] = adjustment
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adjustment.handler_id = adjustment.connect("value-changed", self.value_changed)
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scale = Gtk.Scale(adjustment=adjustment, width_request=200)
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self.box.append(scale)
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def value_changed(self, adjustment, *args):
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name = adjustment.backlight.name
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self.session.SetBrightness("backlight", name, int(adjustment.get_value()))
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def get_config(self):
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return {"icon_size": self.icon.get_pixel_size()}
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