def __init__(self, main_controller):
"""Constructor.
@type main_controller: virtaal.controllers.MainController"""
GObjectWrapper.__init__(self)
self.main_controller = main_controller
self.main_controller.undo_controller = self
self.unit_controller = self.main_controller.store_controller.unit_controller
self.enabled = True
from virtaal.models.undomodel import UndoModel
self.model = UndoModel(self)
self._setup_key_bindings()
self._connect_undo_signals()
