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_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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