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Edit File:glib.py

# -*- coding: utf-8 -*-
# Copyright (C) 2010, 2011, 2012, 2013 Sebastian Wiesner <lunaryorn@gmail.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.glib
    ===========

Glib integration.

:class:`MonitorObserver` integrates device monitoring into the Glib
    mainloop by turing device events into Glib signals.

:mod:`glib` and :mod:`gobject` from PyGObject_ must be available when
    importing this module. PyGtk is not required.

.. _PyGObject: http://www.pygtk.org/

.. moduleauthor::  Sebastian Wiesner  <lunaryorn@gmail.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 _ObserverMixin(object):
    """Mixin to provide observer behavior to the old and the new API."""
    # pylint: disable=too-few-public-methods

def _setup_observer(self, monitor):
        # pylint: disable=attribute-defined-outside-init
        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:
            # pylint: disable=attribute-defined-outside-init
            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):
        # pylint: disable=unused-argument
        if condition == glib.IO_IN:
            device = self.monitor.poll(timeout=0)
            if device is not None:
                self._emit_event(device)
        return True

def _emit_event(self, device):
        self.emit('device-event', device)

class MonitorObserver(gobject.GObject, _ObserverMixin):
    """
    An observer for device events integrating into the :mod:`glib` mainloop.

This class inherits :class:`~gobject.GObject` to turn device events into
    glib signals.

>>> from pyudev import Context, Monitor
    >>> from pyudev.glib import MonitorObserver
    >>> context = Context()
    >>> monitor = Monitor.from_netlink(context)
    >>> monitor.filter_by(subsystem='input')
    >>> observer = MonitorObserver(monitor)
    >>> def device_event(observer, device):
    ...     print('event {0} on device {1}'.format(device.action, device))
    >>> observer.connect('device-event', device_event)
    >>> monitor.start()

This class is a child of :class:`gobject.GObject`.
    """

__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_PYOBJECT,)),
    }

def __init__(self, monitor):
        gobject.GObject.__init__(self)
        self._setup_observer(monitor)

gobject.type_register(MonitorObserver)

class GUDevMonitorObserver(gobject.GObject, _ObserverMixin):
    """
    An observer for device events integrating into the :mod:`glib` mainloop.

.. deprecated:: 0.17
       Will be removed in 1.0.  Use :class:`MonitorObserver` instead.
    """

_action_signal_map = {
        'add': 'device-added', 'remove': 'device-removed',
        'change': 'device-changed', 'move': 'device-moved'}

__gsignals__ = {
        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._setup_observer(monitor)
        import warnings
        warnings.warn('Will be removed in 1.0. '
                      'Use pyudev.glib.MonitorObserver instead.',
                      DeprecationWarning)

def _emit_event(self, device):
        self.emit('device-event', device.action, device)
        signal = self._action_signal_map.get(device.action)
        if signal is not None:
            self.emit(signal, device)

gobject.type_register(GUDevMonitorObserver)

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