Current File : //snap/core/17247/usr/lib/python3/dist-packages/pyudev/pyqt4.py
# -*- 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.pyqt4
============
PyQt4 integration.
:class:`QUDevMonitorObserver` integrates device monitoring into the PyQt4_
mainloop by turing device events into Qt signals.
:mod:`PyQt4.QtCore` from PyQt4_ must be available when importing this
module.
.. _PyQt4: http://riverbankcomputing.co.uk/software/pyqt/intro
.. moduleauthor:: Sebastian Wiesner <lunaryorn@gmail.com>
"""
from __future__ import (print_function, division, unicode_literals,
absolute_import)
from PyQt4.QtCore import QSocketNotifier, QObject, pyqtSignal
from pyudev._util import text_type
from pyudev.core import Device
from pyudev._qt_base import QUDevMonitorObserverMixin
class QUDevMonitorObserver(QObject, QUDevMonitorObserverMixin):
"""
An observer for device events integrating into the :mod:`PyQt4` mainloop.
This class inherits :class:`~PyQt4.QtCore.QObject` to turn device events
into Qt signals:
>>> from pyudev import Context, Monitor
>>> from pyudev.pyqt4 import QUDevMonitorObserver
>>> context = Context()
>>> monitor = Monitor.from_netlink(context)
>>> monitor.filter_by(subsystem='input')
>>> observer = QUDevMonitorObserver(monitor)
>>> def device_connected(device):
... print('{0!r} added'.format(device))
>>> observer.deviceAdded.connect(device_connected)
>>> monitor.start()
This class is a child of :class:`~PyQt4.QtCore.QObject`.
"""
#: emitted upon arbitrary device events
deviceEvent = pyqtSignal(text_type, Device)
#: emitted, if a device was added
deviceAdded = pyqtSignal(Device)
#: emitted, if a device was removed
deviceRemoved = pyqtSignal(Device)
#: emitted, if a device was changed
deviceChanged = pyqtSignal(Device)
#: emitted, if a device was moved
deviceMoved = pyqtSignal(Device)
def __init__(self, monitor, parent=None):
"""
Observe the given ``monitor`` (a :class:`~pyudev.Monitor`):
``parent`` is the parent :class:`~PyQt4.QtCore.QObject` of this
object. It is passed unchanged to the inherited constructor of
:class:`~PyQt4.QtCore.QObject`.
"""
QObject.__init__(self, parent)
self._setup_notifier(monitor, QSocketNotifier)
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