# Copyright (C) 2006, Owen Williams. # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program 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 General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA import logging import gobject import wnck import dbus from model.homeactivity import HomeActivity from model.homerawwindow import HomeRawWindow from model import bundleregistry _SERVICE_NAME = "org.laptop.Activity" _SERVICE_PATH = "/org/laptop/Activity" _SERVICE_INTERFACE = "org.laptop.Activity" class HomeModel(gobject.GObject): """Model of the "Home" view (activity management) The HomeModel is basically the point of registration for all running activities within Sugar. It traps events that tell the system there is a new activity being created (generated by the activity factories), or removed, as well as those which tell us that the currently focussed activity has changed. The HomeModel tracks a set of HomeActivity instances, which are tracking the window to activity mappings the activity factories have set up. """ __gsignals__ = { 'activity-launched': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE, ([gobject.TYPE_PYOBJECT])), 'activity-added': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE, ([gobject.TYPE_PYOBJECT])), 'activity-removed': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE, ([gobject.TYPE_PYOBJECT])), 'active-activity-changed': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE, ([gobject.TYPE_PYOBJECT])) } def __init__(self): gobject.GObject.__init__(self) self._activities = {} self._bundle_registry = bundleregistry.get_registry() self._current_activity = None screen = wnck.screen_get_default() screen.connect('window-opened', self._window_opened_cb) screen.connect('window-closed', self._window_closed_cb) screen.connect('active-window-changed', self._active_window_changed_cb) bus = dbus.SessionBus() bus.add_signal_receiver( self._dbus_name_owner_changed_cb, 'NameOwnerChanged', 'org.freedesktop.DBus', 'org.freedesktop.DBus') def get_current_activity(self): return self._current_activity def __iter__(self): ordered_acts = self._get_ordered_activities() return iter(ordered_acts) def __len__(self): return len(self._activities) def __getitem__(self, i): ordered_acts = self._get_ordered_activities() return ordered_acts[i] def index(self, obj): ordered_acts = self._get_ordered_activities() return ordered_acts.index(obj) def _get_ordered_activities(self): ordered_acts = self._activities.values() ordered_acts.sort(key=lambda a: a.get_launch_time()) return ordered_acts def _window_opened_cb(self, screen, window): if window.get_window_type() == wnck.WINDOW_NORMAL: self._add_activity(window) def _window_closed_cb(self, screen, window): if window.get_window_type() == wnck.WINDOW_NORMAL: self._remove_activity(window.get_xid()) if not self._activities: self.emit('active-activity-changed', None) self._notify_activity_activation(self._current_activity, None) def _dbus_name_owner_changed_cb(self, name, old, new): """Detect new activity instances on the DBus Normally, new activities are detected by the _window_opened_cb callback. However, if the window is opened before the dbus service is up, a RawHomeWindow is created. In here we create a proper HomeActivity replacing the RawHomeWindow. """ if name.startswith(_SERVICE_NAME) and new and not old: xid = name[len(_SERVICE_NAME):] if not xid.isdigit(): return logging.debug("Activity instance launch detected: %s" % name) xid = int(xid) act = self._get_activity_by_xid(xid) if isinstance(act, HomeRawWindow): logging.debug("Removing bogus raw activity %s for window %i" % (act.get_activity_id(), xid)) self._internal_remove_activity(act) self._add_activity(act.get_window()) def _get_activity_by_xid(self, xid): for act in self._activities.values(): if act.get_xid() == xid: return act return None def _notify_activity_activation(self, old_activity, new_activity): if old_activity == new_activity: return if old_activity: service = old_activity.get_service() if service: service.set_active(False) if new_activity: service = new_activity.get_service() if service: service.set_active(True) def _active_window_changed_cb(self, screen): window = screen.get_active_window() if window == None: self.emit('active-activity-changed', None) self._notify_activity_activation(self._current_activity, None) return if window.get_window_type() != wnck.WINDOW_NORMAL: return xid = window.get_xid() act = self._get_activity_by_xid(window.get_xid()) if act: self._notify_activity_activation(self._current_activity, act) self._current_activity = act else: self._notify_activity_activation(self._current_activity, None) self._current_activity = None logging.error('Model for window %d does not exist.' % xid) self.emit('active-activity-changed', self._current_activity) def _add_window(self, window): home_window = HomeRawWindow(window) self._activities[home_window.get_activity_id()] = home_window self.emit('activity-added', home_window) def _add_activity(self, window): """Add the window to the set of windows we track At the moment this requires that something somewhere have registered a dbus service with the XID of the new window that is used to bind the requested activity to the window. window -- gtk.Window instance representing a new normal, top-level window """ bus = dbus.SessionBus() xid = window.get_xid() try: service = dbus.Interface( bus.get_object(_SERVICE_NAME + '%d' % xid, _SERVICE_PATH + "/%s" % xid), _SERVICE_INTERFACE) except dbus.DBusException: service = None if not service: self._add_window(window) return activity = None act_id = service.get_id() act_type = service.get_service_name() if self._activities.has_key(act_id): activity = self._activities[act_id] else: # activity got lost, took longer to launch than we allow, # or it was launched by something other than the shell act_type = service.get_service_name() bundle = self._bundle_registry.get_bundle(act_type) if not bundle: raise RuntimeError("No bundle for activity type '%s'." % act_type) return activity = HomeActivity(bundle, act_id) self._activities[act_id] = activity activity.set_service(service) activity.set_window(window) self.emit('activity-added', activity) def _internal_remove_activity(self, activity): if activity == self._current_activity: self._current_activity = None self.emit('activity-removed', activity) act_id = activity.get_activity_id() del self._activities[act_id] def _remove_activity(self, xid): activity = self._get_activity_by_xid(xid) if activity: self._internal_remove_activity(activity) else: logging.error('Model for window %d does not exist.' % xid) def notify_activity_launch(self, activity_id, service_name): bundle = self._bundle_registry.get_bundle(service_name) if not bundle: raise ValueError("Activity service name '%s' was not found in the bundle registry." % service_name) activity = HomeActivity(bundle, activity_id) self._activities[activity_id] = activity self.emit('activity-launched', activity) def notify_activity_launch_failed(self, activity_id): if self._activities.has_key(activity_id): activity = self._activities[activity_id] logging.debug("Activity %s (%s) launch failed" % (activity_id, activity.get_type())) self._internal_remove_activity(activity) else: logging.error('Model for activity id %s does not exist.' % activity_id)