sugar-toolkit-gtk3/shell/model/devices/battery.py

# Copyright (C) 2006-2007, Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

import gobject

from model.devices import device

class Device(device.Device):
    __gproperties__ = {
        'level' : (int, None, None, 0, 100, 0,
                   gobject.PARAM_READABLE)
    }

    def __init__(self):
        device.Device.__init__(self)
        
        self._level = 0
        self._timeout_id = gobject.timeout_add(2000, self._check_battery_level)

    def do_get_property(self, pspec):
        if pspec.name == 'level':
            return self._level 

    def get_type(self):
        return 'battery'

    def _check_battery_level(self):
        new_level = self._get_battery_level()
        
        if new_level != self._level:
            self._level = new_level
            self.notify('level')

        return True

    def _get_battery_level(self):
        battery_class_path = '/sys/class/battery/psu_0/'

        capacity_path = battery_class_path + 'capacity_percentage'
        try:
            f = open(capacity_path, 'r')
            val = f.read().split('\n')
            level = int(val[0])
            f.close()
        except:
            level = 0

        return level

    def __del__(self):
        gobject.source_remove(self._timeout_id)
        self._timeout_id = 0