Edit File: 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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