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Edit File: wx.py

# -*- 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
    =========

Wx integration.

:class:`MonitorObserver` integrates device monitoring into the wxPython\\_
    mainloop by turing device events into wx events.

:mod:`wx` from wxPython\\_ must be available when importing this module.

.. _wxPython: http://wxpython.org/

.. moduleauthor::  Tobias Eberle  <tobias.eberle@gmx.de>
    .. versionadded:: 0.14

"""

# isort: THIRDPARTY
from wx import EvtHandler, PostEvent  # pylint: disable=import-error
from wx.lib.newevent import NewEvent  # pylint: disable=import-error, no-name-in-module

# isort: LOCAL
# for some reason, pylint thinks pyudev is a third party import
import pyudev  # pylint: disable=wrong-import-order

DeviceEvent, EVT_DEVICE_EVENT = NewEvent()  # pylint: disable=invalid-name

class MonitorObserver(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, Monitor
    >>> from pyudev.wx import MonitorObserver
    >>> context = Context()
    >>> monitor = Monitor.from_netlink(context)
    >>> monitor.filter_by(subsystem='input')
    >>> observer = MonitorObserver(monitor)
    >>> def device_event(event):
    ...     print('action {0} on device {1}'.format(event.device.action, event.device))
    >>> observer.Bind(EVT_DEVICE_EVENT, device_event)
    >>> monitor.start()

This class is a child of :class:`wx.EvtHandler`.

.. versionadded:: 0.17
    """

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 = pyudev.MonitorObserver(
            self.monitor, callback=self._emit_event, 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_event(self, device):
        PostEvent(self, DeviceEvent(device=device))

DeviceAddedEvent, EVT_DEVICE_ADDED = NewEvent()  # pylint: disable=invalid-name
DeviceRemovedEvent, EVT_DEVICE_REMOVED = NewEvent()  # pylint: disable=invalid-name
DeviceChangedEvent, EVT_DEVICE_CHANGED = NewEvent()  # pylint: disable=invalid-name
DeviceMovedEvent, EVT_DEVICE_MOVED = NewEvent()  # pylint: disable=invalid-name

class WxUDevMonitorObserver(MonitorObserver):
    """An observer for device events integrating into the :mod:`wx` mainloop.

.. deprecated:: 0.17
       Will be removed in 1.0.  Use :class:`MonitorObserver` instead.
    """

_action_event_map = {
        "add": DeviceAddedEvent,
        "remove": DeviceRemovedEvent,
        "change": DeviceChangedEvent,
        "move": DeviceMovedEvent,
    }

def __init__(self, monitor):
        MonitorObserver.__init__(self, monitor)
        # isort: STDLIB
        import warnings

warnings.warn(
            "Will be removed in 1.0. " "Use pyudev.wx.MonitorObserver instead.",
            DeprecationWarning,
        )

def _emit_event(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))

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