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/usr/share/virt-manager/virtManager/baseclass.py is in virt-manager 0.9.5-1ubuntu3.

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The actual contents of the file can be viewed below.

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#
# Copyright (C) 2010 Red Hat, Inc.
# Copyright (C) 2010 Cole Robinson <crobinso@redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301 USA.
#

import os
import sys
import logging

import virtManager
import virtManager.guidiff
from virtManager import util

running_config, gobject, GObject, gtk = virtManager.guidiff.get_imports()

class vmmGObject(GObject):

    @staticmethod
    def type_register(*args, **kwargs):
        if not hasattr(gobject, "type_register"):
            return
        gobject.type_register(*args, **kwargs)

    @staticmethod
    def signal_new(klass, signal, args):
        if hasattr(gobject, "signal_new"):
            gobject.signal_new(signal, klass,
                               gobject.SIGNAL_RUN_FIRST,
                               gobject.TYPE_NONE,
                               args)
        else:
            klass.fake_signal_listeners[signal] = []

    _leak_check = True
    fake_signal_listeners = {}

    def __init__(self):
        GObject.__init__(self)
        self.config = running_config

        self._gobject_handles = []
        self._gobject_timeouts = []
        self._gconf_handles = []

        self._signal_id_map = {}
        self._next_signal_id = 1

        self.object_key = str(self)

        # Config might not be available if we error early in startup
        if self.config and self._leak_check:
            self.config.add_object(self.object_key)

    def cleanup(self):
        # Do any cleanup required to drop reference counts so object is
        # actually reaped by python. Usually means unregistering callbacks
        try:
            for h in self._gconf_handles[:]:
                self.remove_gconf_handle(h)
            for h in self._gobject_handles[:]:
                self.disconnect(h)
            for h in self._gobject_timeouts[:]:
                self.remove_gobject_timeout(h)

            self._cleanup()
        except:
            logging.exception("Error cleaning up %s", self)

    def _cleanup(self):
        raise NotImplementedError("_cleanup must be implemented in subclass")

    # Custom signal implementations
    # These functions duplicate gobject signal behavior since it's
    # needed for some TUI functionality
    def _get_signal_listeners(self, signal_name):
        return self.fake_signal_listeners[signal_name]
    def _add_signal_listener(self, signal_name, cb, *args):
        sigid = self._next_signal_id
        self._next_signal_id += 1
        self._signal_id_map[sigid] = (signal_name, cb, args)
        self.fake_signal_listeners[signal_name].append((cb, args))
        return sigid
    def _remove_signal_listener(self, sigid):
        signame, cb, args = self._signal_id_map[sigid]
        listener_data = (cb, args)
        if listener_data not in self.fake_signal_listeners[signame]:
            raise RuntimeError("Didn't find signal listener to remove: %d" %
                               sigid)

        self.fake_signal_listeners[signame].remove(listener_data)
        del(self._signal_id_map[sigid])

    def connect(self, name, callback, *args):
        if hasattr(GObject, "connect"):
            ret = GObject.connect(self, name, callback, *args)
            self._gobject_handles.append(ret)
            return ret
        else:
            return self._add_signal_listener(name, callback, *args)

    def disconnect(self, handle):
        if hasattr(GObject, "disconnect"):
            ret = GObject.disconnect(self, handle)
            self._gobject_handles.remove(handle)
            return ret
        else:
            return self._remove_signal_listener(handle)

    def add_gconf_handle(self, handle):
        self._gconf_handles.append(handle)
    def remove_gconf_handle(self, handle):
        self.config.remove_notifier(handle)
        self._gconf_handles.remove(handle)

    def add_gobject_timeout(self, handle):
        self._gobject_timeouts.append(handle)
    def remove_gobject_timeout(self, handle):
        if not hasattr(gobject, "source_remove"):
            return
        gobject.source_remove(handle)
        self._gobject_timeouts.remove(handle)

    def _logtrace(self, msg):
        import traceback
        logging.debug("%s (%s %s)\n:%s",
                      msg, self.object_key, self.refcount(),
                       "".join(traceback.format_stack()))

    def refcount(self):
        # Function generates 2 temporary refs, so adjust total accordingly
        return (sys.getrefcount(self) - 2)

    def get_hal_helper(self, init=True):
        from virtManager import halhelper
        return halhelper.get_hal_helper(init=init)

    def connect_once(self, signal, func, *args):
        id_list = []

        def wrap_func(*wrapargs):
            if id_list:
                self.disconnect(id_list[0])

            return func(*wrapargs)

        conn_id = self.connect(signal, wrap_func, *args)
        id_list.append(conn_id)

        return conn_id

    def connect_opt_out(self, signal, func, *args):
        id_list = []

        def wrap_func(*wrapargs):
            ret = func(*wrapargs)
            if ret and id_list:
                self.disconnect(id_list[0])

        conn_id = self.connect(signal, wrap_func, *args)
        id_list.append(conn_id)

        return conn_id

    def idle_emit(self, signal, *args):
        """
        Safe wrapper for using 'self.emit' with gobject.idle_add
        """
        def emitwrap(_s, *_a):
            self.emit(_s, *_a)
            return False

        self.idle_add(emitwrap, signal, *args)

    def idle_add(self, func, *args):
        """
        Make sure idle functions are run thread safe
        """
        if not hasattr(gobject, "idle_add"):
            return func(*args)
        return gobject.idle_add(func, *args)

    def timeout_add(self, timeout, func, *args):
        """
        Make sure timeout functions are run thread safe
        """
        if not hasattr(gobject, "timeout_add"):
            return
        return gobject.timeout_add(timeout, func, *args)

    def emit(self, signal_name, *args):
        if hasattr(GObject, "emit"):
            return GObject.emit(self, signal_name, *args)
        else:
            for cb, customargs in self._get_signal_listeners(signal_name):
                cbargs = (self,) + args + customargs
                cb(*cbargs)
            return

    def __del__(self):
        if hasattr(GObject, "__del__"):
            getattr(GObject, "__del__")(self)

        try:
            if self.config and self._leak_check:
                self.config.remove_object(self.object_key)
        except:
            logging.exception("Error removing %s", self.object_key)

class vmmGObjectUI(vmmGObject):
    def __init__(self, filename, windowname):
        vmmGObject.__init__(self)

        self.windowname = windowname
        self.window = None
        self.topwin = None
        self.uifile = None
        self.err = None

        if filename:
            self.uifile = os.path.join(self.config.get_ui_dir(), filename)

            self.window = gtk.Builder()
            self.window.set_translation_domain("virt-manager")
            self.window.add_from_string(
                util.sanitize_gtkbuilder(self.uifile))

            self.topwin = self.widget(self.windowname)
            self.topwin.hide()

            self.err = virtManager.error.vmmErrorDialog(self.topwin)

    def widget(self, name):
        return self.window.get_object(name)

    def cleanup(self):
        self.close()
        vmmGObject.cleanup(self)
        self.window = None
        self.topwin.destroy()
        self.topwin = None
        self.uifile = None
        self.err = None

    def _cleanup(self):
        raise NotImplementedError("_cleanup must be implemented in subclass")

    def close(self, ignore1=None, ignore2=None):
        pass

    def bind_escape_key_close(self):
        def close_on_escape(src_ignore, event):
            if gtk.gdk.keyval_name(event.keyval) == "Escape":
                self.close()

        self.topwin.connect("key-press-event", close_on_escape)