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

# 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.

import os
import sys
import logging

import dbus
import dbus.service
import gobject
import gtk

from sugar.presence.PresenceService import PresenceService
from sugar.activity import Activity
from sugar.activity.bundle import Bundle
from sugar import logger

def get_path(activity_name):
    """Returns the activity path"""
    return '/' + activity_name.replace('.', '/')

class ActivityFactory(dbus.service.Object):
    """Dbus service that takes care of creating new instances of an activity"""

    def __init__(self, activity_type, activity_class):
        self._activity_type = activity_type
        self._activities = []

        splitted_module = activity_class.rsplit('.', 1)
        module_name = splitted_module[0]
        class_name = splitted_module[1]

        module = __import__(module_name)        
        for comp in module_name.split('.')[1:]:
            module = getattr(module, comp)
        if hasattr(module, 'start'):
            module.start()

        self._module = module
        self._constructor = getattr(module, class_name)
    
        bus = dbus.SessionBus()
        factory = activity_type
        bus_name = dbus.service.BusName(factory, bus = bus) 
        dbus.service.Object.__init__(self, bus_name, get_path(factory))

    @dbus.service.method("com.redhat.Sugar.ActivityFactory")
    def create(self):
        activity = self._constructor()

        self._activities.append(activity)
        activity.connect('destroy', self._activity_destroy_cb)

        return activity.window.xid

    def _activity_destroy_cb(self, activity):
        self._activities.remove(activity)

        if hasattr(self._module, 'stop'):
            self._module.stop()

        if len(self._activities) == 0:
            gtk.main_quit()

class ActivityCreationHandler(gobject.GObject):

    __gsignals__ = {
        'error':       (gobject.SIGNAL_RUN_FIRST,
                        gobject.TYPE_NONE, 
                       ([gobject.TYPE_PYOBJECT])),
        'success':     (gobject.SIGNAL_RUN_FIRST,
                        gobject.TYPE_NONE, 
                       ([gobject.TYPE_PYOBJECT]))
    }

    def __init__(self, activity_name):
        gobject.GObject.__init__(self)

        bus = dbus.SessionBus()
        factory_name = activity_name
        factory_path = get_path(factory_name) 

        proxy_obj = bus.get_object(factory_name, factory_path)
        factory = dbus.Interface(proxy_obj, "com.redhat.Sugar.ActivityFactory")

        factory.create(reply_handler=self._reply_handler, error_handler=self._error_handler)

    def _reply_handler(self, xid):
        bus = dbus.SessionBus()
        proxy_obj = bus.get_object(Activity.get_service_name(xid),
                                    Activity.get_object_path(xid))
        activity = dbus.Interface(proxy_obj, Activity.ACTIVITY_INTERFACE)
        self.emit('success', activity)

    def _error_handler(self, err):
        logging.debug("Couldn't create activity: %s" % err)
        self.emit('error', err)

def create(activity_name):
    """Create a new activity from its name."""
    return ActivityCreationHandler(activity_name)

def start_factory(activity_class, bundle_path):
    """Start the activity factory."""
    bundle = Bundle(bundle_path)

    logger.start(bundle.get_name())

    os.environ['SUGAR_BUNDLE_PATH'] = bundle_path
    os.environ['SUGAR_BUNDLE_SERVICE_NAME'] = bundle.get_service_name()
    os.environ['SUGAR_BUNDLE_DEFAULT_TYPE'] = bundle.get_default_type()

    factory = ActivityFactory(bundle.get_service_name(), activity_class)