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# -*- coding: utf-8 -*-
# Copyright (C) 2010, 2011, 2012 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._qt_base
===============
Base mixin class for Qt4 support.
.. moduleauthor:: Sebastian Wiesner <lunaryorn@gmail.com>
"""
from __future__ import (print_function, division, unicode_literals,
absolute_import)
class QUDevMonitorObserverMixin(object):
def _setup_notifier(self, monitor, notifier_class):
self.monitor = monitor
self.notifier = notifier_class(
monitor.fileno(), notifier_class.Read, self)
self.notifier.activated[int].connect(self._process_udev_event)
self._action_signal_map = {
'add': self.deviceAdded, 'remove': self.deviceRemoved,
'change': self.deviceChanged, 'move': self.deviceMoved,
}
@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. This merely
reflects the state of the ``enabled`` property of the underlying
:attr:`notifier`.
.. versionadded:: 0.14
"""
return self.notifier.isEnabled()
@enabled.setter
def enabled(self, value):
self.notifier.setEnabled(value)
def _process_udev_event(self):
"""
Attempt to receive a single device event from the monitor, process
the event and emit corresponding signals.
Called by ``QSocketNotifier``, if data is available on the udev
monitoring socket.
"""
device = self.monitor.poll(timeout=0)
if device:
self.deviceEvent.emit(device.action, device)
signal = self._action_signal_map.get(device.action)
if signal is not None:
signal.emit(device)
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