152 lines
5.6 KiB
Python
152 lines
5.6 KiB
Python
"""Shell side object which manages request to start activity"""
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# Copyright (C) 2006, Red Hat, Inc.
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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import logging
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import dbus
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import gobject
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import gtk
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from sugar.presence import presenceservice
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from sugar.activity.activityhandle import ActivityHandle
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from sugar import util
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_ACTIVITY_SERVICE_NAME = "org.laptop.Activity"
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_ACTIVITY_SERVICE_PATH = "/org/laptop/Activity"
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_ACTIVITY_INTERFACE = "org.laptop.Activity"
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_ACTIVITY_FACTORY_INTERFACE = "org.laptop.ActivityFactory"
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def create_activity_id():
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"""Generate a new, unique ID for this activity"""
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pservice = presenceservice.get_instance()
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# create a new unique activity ID
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i = 0
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act_id = None
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while i < 10:
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act_id = util.unique_id()
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i += 1
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# check through network activities
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found = False
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activities = pservice.get_activities()
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for act in activities:
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if act_id == act.props.id:
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found = True
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break
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if not found:
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return act_id
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raise RuntimeError("Cannot generate unique activity id.")
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class ActivityCreationHandler(gobject.GObject):
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"""Sugar-side activity creation interface
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This object uses a dbus method on the ActivityFactory
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service to create the new activity. It generates
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GObject events in response to the success/failure of
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activity startup using callbacks to the service's
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create call.
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"""
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__gsignals__ = {
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'success': (gobject.SIGNAL_RUN_FIRST,
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gobject.TYPE_NONE, ([])),
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'error': (gobject.SIGNAL_RUN_FIRST,
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gobject.TYPE_NONE,
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([gobject.TYPE_PYOBJECT]))
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}
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def __init__(self, service_name, activity_handle):
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"""Initialise the handler
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service_name -- the service name of the bundle factory
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activity_handle -- stores the values which are to
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be passed to the service to uniquely identify
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the activity to be created and the sharing
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service that may or may not be connected with it
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sugar.activity.activityhandle.ActivityHandle instance
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calls the "create" method on the service for this
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particular activity type and registers the
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_reply_handler and _error_handler methods on that
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call's results.
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The specific service which creates new instances of this
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particular type of activity is created during the activity
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registration process in shell bundle registry which creates
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service definition files for each registered bundle type.
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"""
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gobject.GObject.__init__(self)
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self._service_name = service_name
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self._activity_handle = activity_handle
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bus = dbus.SessionBus()
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object_path = '/' + service_name.replace('.', '/')
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proxy_obj = bus.get_object(service_name, object_path,
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follow_name_owner_changes=True)
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factory = dbus.Interface(proxy_obj, _ACTIVITY_FACTORY_INTERFACE)
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factory.create(self._activity_handle.get_dict(),
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reply_handler=self._reply_handler,
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error_handler=self._error_handler)
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def get_activity_id(self):
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"""Retrieve the unique identity for this activity"""
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return self._activity_handle.activity_id
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def _reply_handler(self, xid):
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"""Reply from service regarding what window was created
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xid -- X windows ID for the window that was just created
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emits the "success" message (on ourselves)
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"""
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logging.debug("Activity created %s (%s)." %
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(self._activity_handle.activity_id, self._service_name))
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self.emit('success')
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def _error_handler(self, err):
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"""Reply from service with an error message (exception)
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err -- exception object describing the error
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emits the "error" message (on ourselves)
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"""
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logging.debug("Couldn't create activity %s (%s): %s" %
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(self._activity_handle.activity_id, self._service_name, err))
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self.emit('error', err)
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def create(service_name, activity_handle=None):
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"""Create a new activity from its name."""
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if not activity_handle:
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activity_handle = ActivityHandle(create_activity_id())
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return ActivityCreationHandler(service_name, activity_handle)
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def create_with_uri(service_name, uri):
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"""Create a new activity and pass the uri as handle."""
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activity_handle = ActivityHandle(create_activity_id())
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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):
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"""Create a new activity and pass the object id as handle."""
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activity_handle = ActivityHandle(create_activity_id())
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activity_handle.object_id = object_id
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return ActivityCreationHandler(service_name, activity_handle)
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