View file File name : glib.py Content :# -*- coding: utf-8 -*- # Copyright (C) 2010, 2011, 2012 Sebastian Wiesner <lunaryorn@googlemail.com> # This library is free software; you can redistribute it and/or modify it # under the terms of the GNU Lesser General Public License as published by the # Free Software Foundation; either version 2.1 of the License, or (at your # option) any later version. # This library 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 Lesser General Public License # for more details. # You should have received a copy of the GNU Lesser General Public License # along with this library; if not, write to the Free Software Foundation, # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA """ pyudev.pygtk ============ Provide :class:`~pyudev.glib.GUDevMonitorObserver` to integrate a :class:`~pyudev.Monitor` into a :class:`glib.MainLoop`. To use this module, :mod:`glib` and :mod:`gobject` from PyGObject_ must be available. PyGtk is not required. .. _PyGObject: http://www.pygtk.org/ .. moduleauthor:: Sebastian Wiesner <lunaryorn@googlemail.com> .. versionadded:: 0.7 """ from __future__ import (print_function, division, unicode_literals, absolute_import) # thanks to absolute imports, this really imports the glib binding and not this # module again import glib import gobject class GUDevMonitorObserver(gobject.GObject): """ Observe a :class:`~pyudev.Monitor` and emit Glib signals upon device events: >>> context = pyudev.Context() >>> monitor = pyudev.Monitor.from_netlink(context) >>> monitor.filter_by(subsystem='input') >>> observer = pyudev.pygtk.GUDevMonitorObserver(monitor) >>> def device_connected(observer, device): ... print('{0!r} added'.format(device)) >>> observer.connect('device-added', device_connected) >>> monitor.start() This class is a child of :class:`gobject.GObject`. """ _action_signal_map = { 'add': 'device-added', 'remove': 'device-removed', 'change': 'device-changed', 'move': 'device-moved'} __gsignals__ = { # explicitly convert the signal to str, because glib expects the # *native* string type of the corresponding python version as type of # signal name, and str() is the name of the native string type of both # python versions. We could also remove the "unicode_literals" import, # but I don't want to make exceptions to the standard set of future # imports used throughout pyudev for the sake of consistency. str('device-event'): (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE, (gobject.TYPE_STRING, gobject.TYPE_PYOBJECT)), str('device-added'): (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE, (gobject.TYPE_PYOBJECT,)), str('device-removed'): (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE, (gobject.TYPE_PYOBJECT,)), str('device-changed'): (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE, (gobject.TYPE_PYOBJECT,)), str('device-moved'): (gobject.SIGNAL_RUN_LAST, gobject.TYPE_NONE, (gobject.TYPE_PYOBJECT,)), } def __init__(self, monitor): gobject.GObject.__init__(self) self.monitor = monitor self.event_source = None self.enabled = True @property def enabled(self): """ Whether this observer is enabled or not. If ``True`` (the default), this observer is enabled, and emits events. Otherwise it is disabled and does not emit any events. .. versionadded:: 0.14 """ return self.event_source is not None @enabled.setter def enabled(self, value): if value and self.event_source is None: self.event_source = glib.io_add_watch( self.monitor, glib.IO_IN, self._process_udev_event) elif not value and self.event_source is not None: glib.source_remove(self.event_source) def _process_udev_event(self, source, condition): if condition == glib.IO_IN: event = self.monitor.receive_device() if event: action, device = event self.emit('device-event', action, device) self.emit(self._action_signal_map[action], device) return True gobject.type_register(GUDevMonitorObserver)