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Directory : /lib64/python3.6/site-packages/gi/overrides/
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Current File : /lib64/python3.6/site-packages/gi/overrides/Gio.py
# -*- Mode: Python; py-indent-offset: 4 -*-
# vim: tabstop=4 shiftwidth=4 expandtab
#
# Copyright (C) 2010 Ignacio Casal Quinteiro <icq@gnome.org>
#
# 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

import warnings

from .._ossighelper import wakeup_on_signal, register_sigint_fallback
from ..overrides import override, deprecated_init
from ..module import get_introspection_module
from gi import PyGIWarning

from gi.repository import GLib

import sys

Gio = get_introspection_module('Gio')

__all__ = []


class Application(Gio.Application):

    def run(self, *args, **kwargs):
        with register_sigint_fallback(self.quit):
            with wakeup_on_signal():
                return Gio.Application.run(self, *args, **kwargs)


Application = override(Application)
__all__.append('Application')


class VolumeMonitor(Gio.VolumeMonitor):

    def __init__(self, *args, **kwargs):
        super(VolumeMonitor, self).__init__(*args, **kwargs)

        # https://bugzilla.gnome.org/show_bug.cgi?id=744690
        warnings.warn(
            "Gio.VolumeMonitor shouldn't be instantiated directly, "
            "use Gio.VolumeMonitor.get() instead.",
            PyGIWarning, stacklevel=2)


VolumeMonitor = override(VolumeMonitor)
__all__.append('VolumeMonitor')


class FileEnumerator(Gio.FileEnumerator):
    def __iter__(self):
        return self

    def __next__(self):
        file_info = self.next_file(None)

        if file_info is not None:
            return file_info
        else:
            raise StopIteration

    # python 2 compat for the iter protocol
    next = __next__


FileEnumerator = override(FileEnumerator)
__all__.append('FileEnumerator')


class MenuItem(Gio.MenuItem):
    def set_attribute(self, attributes):
        for (name, format_string, value) in attributes:
            self.set_attribute_value(name, GLib.Variant(format_string, value))


MenuItem = override(MenuItem)
__all__.append('MenuItem')


class Settings(Gio.Settings):
    '''Provide dictionary-like access to GLib.Settings.'''

    __init__ = deprecated_init(Gio.Settings.__init__,
                               arg_names=('schema', 'path', 'backend'))

    def __contains__(self, key):
        return key in self.list_keys()

    def __len__(self):
        return len(self.list_keys())

    def __bool__(self):
        # for "if mysettings" we don't want a dictionary-like test here, just
        # if the object isn't None
        return True

    # alias for Python 2.x object protocol
    __nonzero__ = __bool__

    def __getitem__(self, key):
        # get_value() aborts the program on an unknown key
        if key not in self:
            raise KeyError('unknown key: %r' % (key,))

        return self.get_value(key).unpack()

    def __setitem__(self, key, value):
        # set_value() aborts the program on an unknown key
        if key not in self:
            raise KeyError('unknown key: %r' % (key,))

        # determine type string of this key
        range = self.get_range(key)
        type_ = range.get_child_value(0).get_string()
        v = range.get_child_value(1)
        if type_ == 'type':
            # v is boxed empty array, type of its elements is the allowed value type
            type_str = v.get_child_value(0).get_type_string()
            assert type_str.startswith('a')
            type_str = type_str[1:]
        elif type_ == 'enum':
            # v is an array with the allowed values
            assert v.get_child_value(0).get_type_string().startswith('a')
            type_str = v.get_child_value(0).get_child_value(0).get_type_string()
            allowed = v.unpack()
            if value not in allowed:
                raise ValueError('value %s is not an allowed enum (%s)' % (value, allowed))
        else:
            raise NotImplementedError('Cannot handle allowed type range class ' + str(type_))

        self.set_value(key, GLib.Variant(type_str, value))

    def keys(self):
        return self.list_keys()


Settings = override(Settings)
__all__.append('Settings')


class _DBusProxyMethodCall:
    '''Helper class to implement DBusProxy method calls.'''

    def __init__(self, dbus_proxy, method_name):
        self.dbus_proxy = dbus_proxy
        self.method_name = method_name

    def __async_result_handler(self, obj, result, user_data):
        (result_callback, error_callback, real_user_data) = user_data
        try:
            ret = obj.call_finish(result)
        except Exception:
            etype, e = sys.exc_info()[:2]
            # return exception as value
            if error_callback:
                error_callback(obj, e, real_user_data)
            else:
                result_callback(obj, e, real_user_data)
            return

        result_callback(obj, self._unpack_result(ret), real_user_data)

    def __call__(self, *args, **kwargs):
        # the first positional argument is the signature, unless we are calling
        # a method without arguments; then signature is implied to be '()'.
        if args:
            signature = args[0]
            args = args[1:]
            if not isinstance(signature, str):
                raise TypeError('first argument must be the method signature string: %r' % signature)
        else:
            signature = '()'

        arg_variant = GLib.Variant(signature, tuple(args))

        if 'result_handler' in kwargs:
            # asynchronous call
            user_data = (kwargs['result_handler'],
                         kwargs.get('error_handler'),
                         kwargs.get('user_data'))
            self.dbus_proxy.call(self.method_name, arg_variant,
                                 kwargs.get('flags', 0), kwargs.get('timeout', -1), None,
                                 self.__async_result_handler, user_data)
        else:
            # synchronous call
            result = self.dbus_proxy.call_sync(self.method_name, arg_variant,
                                               kwargs.get('flags', 0),
                                               kwargs.get('timeout', -1),
                                               None)
            return self._unpack_result(result)

    @classmethod
    def _unpack_result(klass, result):
        '''Convert a D-BUS return variant into an appropriate return value'''

        result = result.unpack()

        # to be compatible with standard Python behaviour, unbox
        # single-element tuples and return None for empty result tuples
        if len(result) == 1:
            result = result[0]
        elif len(result) == 0:
            result = None

        return result


class DBusProxy(Gio.DBusProxy):
    '''Provide comfortable and pythonic method calls.

    This marshalls the method arguments into a GVariant, invokes the
    call_sync() method on the DBusProxy object, and unmarshalls the result
    GVariant back into a Python tuple.

    The first argument always needs to be the D-Bus signature tuple of the
    method call. Example:

      proxy = Gio.DBusProxy.new_sync(...)
      result = proxy.MyMethod('(is)', 42, 'hello')

    The exception are methods which take no arguments, like
    proxy.MyMethod('()'). For these you can omit the signature and just write
    proxy.MyMethod().

    Optional keyword arguments:

    - timeout: timeout for the call in milliseconds (default to D-Bus timeout)

    - flags: Combination of Gio.DBusCallFlags.*

    - result_handler: Do an asynchronous method call and invoke
         result_handler(proxy_object, result, user_data) when it finishes.

    - error_handler: If the asynchronous call raises an exception,
      error_handler(proxy_object, exception, user_data) is called when it
      finishes. If error_handler is not given, result_handler is called with
      the exception object as result instead.

    - user_data: Optional user data to pass to result_handler for
      asynchronous calls.

    Example for asynchronous calls:

      def mymethod_done(proxy, result, user_data):
          if isinstance(result, Exception):
              # handle error
          else:
              # do something with result

      proxy.MyMethod('(is)', 42, 'hello',
          result_handler=mymethod_done, user_data='data')
    '''
    def __getattr__(self, name):
        return _DBusProxyMethodCall(self, name)


DBusProxy = override(DBusProxy)
__all__.append('DBusProxy')
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