sugar-toolkit-gtk3/sugar/activity/activityfactory.py

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"""Shell side object which manages request to start activity"""
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# Copyright (C) 2006, Red Hat, Inc.
#
# 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 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., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
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import logging
import dbus
import gobject
import gtk
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from sugar.presence import presenceservice
from sugar.activity import bundleregistry
from sugar.activity.activityhandle import ActivityHandle
from sugar import util
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_ACTIVITY_SERVICE_NAME = "org.laptop.Activity"
_ACTIVITY_SERVICE_PATH = "/org/laptop/Activity"
_ACTIVITY_INTERFACE = "org.laptop.Activity"
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_ACTIVITY_FACTORY_INTERFACE = "org.laptop.ActivityFactory"
def create_activity_id():
"""Generate a new, unique ID for this activity"""
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pservice = presenceservice.get_instance()
# create a new unique activity ID
i = 0
act_id = None
while i < 10:
act_id = util.unique_id()
i += 1
# check through network activities
found = False
activities = pservice.get_activities()
for act in activities:
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if act_id == act.props.id:
found = True
break
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if not found:
return act_id
raise RuntimeError("Cannot generate unique activity id.")
class ActivityCreationHandler(gobject.GObject):
"""Sugar-side activity creation interface
This object uses a dbus method on the ActivityFactory
service to create the new activity. It generates
GObject events in response to the success/failure of
activity startup using callbacks to the service's
create call.
"""
__gsignals__ = {
'success': (gobject.SIGNAL_RUN_FIRST,
gobject.TYPE_NONE, ([])),
'error': (gobject.SIGNAL_RUN_FIRST,
gobject.TYPE_NONE,
([gobject.TYPE_PYOBJECT]))
}
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def __init__(self, service_name, activity_handle):
"""Initialise the handler
service_name -- used to retrieve the activity bundle
from the global BundleRegistry. This is what
determines what activity will be run.
activity_handle -- stores the values which are to
be passed to the service to uniquely identify
the activity to be created and the sharing
service that may or may not be connected with it
sugar.activity.activityhandle.ActivityHandle instance
calls the "create" method on the service for this
particular activity type and registers the
_reply_handler and _error_handler methods on that
call's results.
The specific service which creates new instances of this
particular type of activity is created during the activity
registration process in
sugar.activity.bundleregistry.BundleRegistry which creates
service definition files for each registered bundle type.
"""
gobject.GObject.__init__(self)
self._service_name = service_name
self._activity_handle = activity_handle
registry = bundleregistry.get_registry()
bundle = registry.get_bundle(service_name)
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bus = dbus.SessionBus()
proxy_obj = bus.get_object(service_name, bundle.get_object_path(), follow_name_owner_changes=True)
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factory = dbus.Interface(proxy_obj, _ACTIVITY_FACTORY_INTERFACE)
factory.create(self._activity_handle.get_dict(),
reply_handler=self._reply_handler,
error_handler=self._error_handler)
def get_activity_id(self):
"""Retrieve the unique identity for this activity"""
return self._activity_handle.activity_id
def _reply_handler(self, xid):
"""Reply from service regarding what window was created
xid -- X windows ID for the window that was just created
emits the "success" message (on ourselves)
"""
logging.debug("Activity created %s (%s)." %
(self._activity_handle.activity_id, self._service_name))
self.emit('success')
def _error_handler(self, err):
"""Reply from service with an error message (exception)
err -- exception object describing the error
emits the "error" message (on ourselves)
"""
logging.debug("Couldn't create activity %s (%s): %s" %
(self._activity_handle.activity_id, self._service_name, err))
self.emit('error', err)
def create(service_name, activity_handle=None):
"""Create a new activity from its name."""
if not activity_handle:
activity_handle = ActivityHandle(create_activity_id())
return ActivityCreationHandler(service_name, activity_handle)
def create_with_uri(service_name, uri):
"""Create a new activity and pass the uri as handle."""
activity_handle = ActivityHandle(create_activity_id())
activity_handle.uri = uri
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return ActivityCreationHandler(service_name, activity_handle)
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def create_with_object_id(service_name, object_id):
"""Create a new activity and pass the object id as handle."""
activity_handle = ActivityHandle(create_activity_id())
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activity_handle.object_id = object_id
return ActivityCreationHandler(service_name, activity_handle)