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, callback=self._emit_events,
name='wx-observer-thread')
self._observer_thread.start()
class WxUDevMonitorObserver(EvtHandler):
"""
An observer for device events integrating into the :mod:`wx` mainloop.
This class inherits :class:`~wx.EvtHandler` to turn device events into
wx events:
>>> from pyudev import Context, Device
>>> from pyudev.wx import WxUDevMonitorObserver
>>> context = Context()
>>> monitor = Monitor.from_netlink(context)
>>> monitor.filter_by(subsystem='input')
>>> observer = 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, callback=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, device):
PostEvent(self, DeviceEvent(action=device.action, device=device))
event_class = self._action_event_map.get(device.action)
if event_class is not None:
PostEvent(self, event_class(device=device))
