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Diffstat (limited to 'src/sugar/tutorius/filters.py')
| -rw-r--r-- | src/sugar/tutorius/filters.py | 204 |
1 files changed, 0 insertions, 204 deletions
diff --git a/src/sugar/tutorius/filters.py b/src/sugar/tutorius/filters.py deleted file mode 100644 index aa8c997..0000000 --- a/src/sugar/tutorius/filters.py +++ /dev/null @@ -1,204 +0,0 @@ -# Copyright (C) 2009, Tutorius.org -# Copyright (C) 2009, Vincent Vinet <vince.vinet@gmail.com> -# -# 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 gobject -import gtk -import logging -logger = logging.getLogger("filters") - -from sugar.tutorius.gtkutils import find_widget -from sugar.tutorius.services import ObjectStore -from sugar.tutorius import properties - - -class EventFilter(properties.TPropContainer): - """ - Base class for an event filter - """ - - next_state = properties.TStringProperty("None") - - def __init__(self, next_state=None): - """ - Constructor. - @param next_state name of the next state - """ - super(EventFilter, self).__init__() - if next_state: - self.next_state = next_state - self._callback = None - - def get_next_state(self): - """ - Getter for the next state - """ - return self.next_state - - def set_next_state(self, new_next_name): - """ - Setter for the next state. Should only be used during construction of - the event_fitler, not while the tutorial is running. - """ - self.next_state = new_next_name - - def install_handlers(self, callback, **kwargs): - """ - install_handlers is called for eventfilters to setup all - necessary event handlers to be able to catch the desired - event. - - @param callback the callback function that will be called - with the event filter as an argument when the event is catched - and validated. - @param **kwargs unused by this handler for now, allows subclasses - to receive information about the context when installing - - Subclasses must call this super method to setup the callback if they - feel like cooperating - """ - self._callback = callback - - def remove_handlers(self): - """ - remove_handlers is called when a state is done so that all - event filters can cleanup any handlers they have installed - - This function will also clear the callback function so that any - leftover handler that is triggered will not be able to change the - application state. - - subclasses must call this super method to cleanup the callback if they - collaborate and use this classe's do_callback() - """ - self._callback = None - - def do_callback(self, *args, **kwargs): - """ - Default callback function that calls the event filter callback - with the event filter as only argument. - """ - if self._callback: - self._callback(self) - -class TimerEvent(EventFilter): - """ - TimerEvent is a special EventFilter that uses gobject - timeouts to trigger a state change after a specified amount - of time. It must be used inside a gobject main loop to work. - """ - def __init__(self,next_state,timeout_s): - """Constructor. - - @param next_state default EventFilter param, passed on to EventFilter - @param timeout_s timeout in seconds - """ - super(TimerEvent,self).__init__(next_state) - self._timeout = timeout_s - self._handler_id = None - - def install_handlers(self, callback, **kwargs): - """install_handlers creates the timer and starts it""" - super(TimerEvent,self).install_handlers(callback, **kwargs) - #Create the timer - self._handler_id = gobject.timeout_add_seconds(self._timeout, self._timeout_cb) - - def remove_handlers(self): - """remove handler removes the timer""" - super(TimerEvent,self).remove_handlers() - if self._handler_id: - try: - #XXX What happens if this was already triggered? - #remove the timer - gobject.source_remove(self._handler_id) - except: - pass - - def _timeout_cb(self): - """ - _timeout_cb triggers the eventfilter callback. - - It is necessary because gobject timers only stop if the callback they - trigger returns False - """ - self.do_callback() - return False #Stops timeout - -class GtkWidgetTypeFilter(EventFilter): - """ - Event Filter that listens for keystrokes on a widget - """ - def __init__(self, next_state, object_id, text=None, strokes=None): - """Constructor - @param next_state default EventFilter param, passed on to EventFilter - @param object_id object tree-ish identifier - @param text resulting text expected - @param strokes list of strokes expected - - At least one of text or strokes must be supplied - """ - super(GtkWidgetTypeFilter, self).__init__(next_state) - self._object_id = object_id - self._text = text - self._captext = "" - self._strokes = strokes - self._capstrokes = [] - self._widget = None - self._handler_id = None - - def install_handlers(self, callback, **kwargs): - """install handlers - @param callback default EventFilter callback arg - """ - super(GtkWidgetTypeFilter, self).install_handlers(callback, **kwargs) - logger.debug("~~~GtkWidgetTypeFilter install") - activity = ObjectStore().activity - if activity is None: - logger.error("No activity") - raise RuntimeWarning("no activity in the objectstore") - - self._widget = find_widget(activity, self._object_id) - if self._widget: - self._handler_id= self._widget.connect("key-press-event",self.__keypress_cb) - logger.debug("~~~Connected handler %d on %s" % (self._handler_id,self._object_id) ) - - def remove_handlers(self): - """remove handlers""" - super(GtkWidgetTypeFilter, self).remove_handlers() - #if an event was connected, disconnect it - if self._handler_id: - self._widget.handler_disconnect(self._handler_id) - self._handler_id=None - - def __keypress_cb(self, widget, event, *args): - """keypress callback""" - logger.debug("~~~keypressed!") - key = event.keyval - keystr = event.string - logger.debug("~~~Got key: " + str(key) + ":"+ keystr) - self._capstrokes += [key] - #TODO Treat other stuff, such as arrows - if key == gtk.keysyms.BackSpace: - self._captext = self._captext[:-1] - else: - self._captext = self._captext + keystr - - logger.debug("~~~Current state: " + str(self._capstrokes) + ":" + str(self._captext)) - if not self._strokes is None and self._strokes in self._capstrokes: - self.do_callback() - if not self._text is None and self._text in self._captext: - self.do_callback() - |