Current File : //snap/core20/2318/lib/python3/dist-packages/pyudev/_qt_base.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._qt_base
===============
Base mixin class for Qt4,Qt5 support.
.. moduleauthor:: Sebastian Wiesner <lunaryorn@gmail.com>
"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals
import six
from pyudev.device import Device
class MonitorObserverMixin(object):
"""
Base mixin for pyqt monitor observers.
"""
# pylint: disable=too-few-public-methods
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)
@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 is not None:
self._emit_event(device)
def _emit_event(self, device):
self.deviceEvent.emit(device)
class QUDevMonitorObserverMixin(MonitorObserverMixin):
"""
Obsolete monitor observer mixin.
"""
# pylint: disable=too-few-public-methods
def _setup_notifier(self, monitor, notifier_class):
MonitorObserverMixin._setup_notifier(self, monitor, notifier_class)
self._action_signal_map = {
'add': self.deviceAdded, 'remove': self.deviceRemoved,
'change': self.deviceChanged, 'move': self.deviceMoved,
}
import warnings
warnings.warn('Will be removed in 1.0. '
'Use pyudev.pyqt4.MonitorObserver instead.',
DeprecationWarning)
def _emit_event(self, device):
self.deviceEvent.emit(device.action, device)
signal = self._action_signal_map.get(device.action)
if signal is not None:
signal.emit(device)
def make_init(qobject, socket_notifier):
"""
Generates an initializer to observer the given ``monitor``
(a :class:`~pyudev.Monitor`):
``parent`` is the parent :class:`~PyQt{4,5}.QtCore.QObject` of this
object. It is passed unchanged to the inherited constructor of
:class:`~PyQt{4,5}.QtCore.QObject`.
"""
def __init__(self, monitor, parent=None):
qobject.__init__(self, parent)
# pylint: disable=protected-access
self._setup_notifier(monitor, socket_notifier)
return __init__
class MonitorObserverGenerator(object):
"""
Class to generate a MonitorObserver class.
"""
# pylint: disable=too-few-public-methods
@staticmethod
def make_monitor_observer(qobject, signal, socket_notifier):
"""Generates an observer for device events integrating into the
PyQt{4,5} mainloop.
This class inherits :class:`~PyQt{4,5}.QtCore.QObject` to turn device
events into Qt signals:
>>> from pyudev import Context, Monitor
>>> from pyudev.pyqt4 import MonitorObserver
>>> context = Context()
>>> monitor = Monitor.from_netlink(context)
>>> monitor.filter_by(subsystem='input')
>>> observer = MonitorObserver(monitor)
>>> def device_event(device):
... print('event {0} on device {1}'.format(device.action, device))
>>> observer.deviceEvent.connect(device_event)
>>> monitor.start()
This class is a child of :class:`~{PySide, PyQt{4,5}}.QtCore.QObject`.
"""
return type(
str("MonitorObserver"),
(qobject, MonitorObserverMixin),
{
str("__init__") : make_init(qobject, socket_notifier),
str("deviceEvent") : signal(Device)
}
)
class QUDevMonitorObserverGenerator(object):
"""
Class to generate a MonitorObserver class.
"""
# pylint: disable=too-few-public-methods
@staticmethod
def make_monitor_observer(qobject, signal, socket_notifier):
"""Generates an observer for device events integrating into the
PyQt{4,5} mainloop.
This class inherits :class:`~PyQt{4,5}.QtCore.QObject` to turn device
events into Qt signals:
>>> from pyudev import Context, Monitor
>>> from pyudev.pyqt4 import MonitorObserver
>>> context = Context()
>>> monitor = Monitor.from_netlink(context)
>>> monitor.filter_by(subsystem='input')
>>> observer = MonitorObserver(monitor)
>>> def device_event(device):
... print('event {0} on device {1}'.format(device.action, device))
>>> observer.deviceEvent.connect(device_event)
>>> monitor.start()
This class is a child of :class:`~{PyQt{4,5}, PySide}.QtCore.QObject`.
"""
return type(
str("QUDevMonitorObserver"),
(qobject, QUDevMonitorObserverMixin),
{
str("__init__") : make_init(qobject, socket_notifier),
#: emitted upon arbitrary device events
str("deviceEvent") : signal(six.text_type, Device),
#: emitted if a device was added
str("deviceAdded") : signal(Device),
#: emitted if a device was removed
str("deviceRemoved") : signal(Device),
#: emitted if a device was changed
str("deviceChanged") : signal(Device),
#: emitted if a device was moved
str("deviceMoved") : signal(Device)
}
)
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