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# -*- coding: utf-8 -*-
# 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.wx
=========
Provides :class:`~pyudev.wx.WXUDevMonitorObserver` to integrate a
:class:`~pyudev.Monitor` into a :meth:`wx.App.MainLoop`.
To use this module, :mod:`wx` from wxPython must be available.
.. moduleauthor:: Tobias Eberle <tobias.eberle@gmx.de>
.. versionadded:: 0.14
"""
from __future__ import (print_function, division, unicode_literals,
absolute_import)
from wx import EvtHandler, PostEvent
from wx.lib.newevent import NewEvent
from pyudev.monitor import MonitorObserver
DeviceEvent, EVT_DEVICE_EVENT = NewEvent()
DeviceAddedEvent, EVT_DEVICE_ADDED = NewEvent()
DeviceRemovedEvent, EVT_DEVICE_REMOVED = NewEvent()
DeviceChangedEvent, EVT_DEVICE_CHANGED = NewEvent()
DeviceMovedEvent, EVT_DEVICE_MOVED = NewEvent()
class WxUDevMonitorObserver(EvtHandler):
"""
Observe a :class:`~pyudev.Monitor` and post wx events upon device events:
>>> context = pyudev.Context()
>>> monitor = pyudev.Monitor.from_netlink(context)
>>> monitor.filter_by(subsystem='input')
>>> observer = pyudev.wx.WxUDevMonitorObserver(monitor)
>>> def device_connected(event):
... print('{0!r} added'.format(event.device))
>>> observer.Bind(EVT_DEVICE_ADDED, device_connected)
>>> monitor.start()
This class is a child of :class:`wx.EvtHandler`.
"""
_action_event_map = {
'add': DeviceAddedEvent,
'remove': DeviceRemovedEvent,
'change': DeviceChangedEvent,
'move': DeviceMovedEvent
}
def __init__(self, monitor):
EvtHandler.__init__(self)
self.monitor = monitor
self._observer_thread = None
self.start()
@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.
"""
return self._observer_thread is not None
@enabled.setter
def enabled(self, value):
if value:
self.start()
else:
self.stop()
def start(self):
"""
Enable this observer.
Do nothing, if the observer is already enabled.
"""
if self._observer_thread is not None:
return
self._observer_thread = MonitorObserver(
self.monitor, self._emit_events, name='wx-observer-thread')
self._observer_thread.start()
def stop(self):
"""
Disable this observer.
Do nothing, if the observer is already disabled.
"""
if self._observer_thread is None:
return
self._observer_thread.stop()
def _emit_events(self, action, device):
PostEvent(self, DeviceEvent(action=action, device=device))
event_class = self._action_event_map[action]
PostEvent(self, event_class(device=device))
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