new_contents: # Copyright 2015 Canonical, Ltd.
  #
  # This program is free software: you can redistribute it and/or modify
  # it under the terms of the GNU Affero General Public License as
  # published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
  #
  # You should have received a copy of the GNU Affero General Public License
  # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  
  """ View policy
  
  Contains some default key navigations
  """
  
  from urwid import WidgetWrap
  
  
  class ViewPolicy(WidgetWrap):
      def keypress(self, size, key):
          if key == 'esc':
              self.signal.emit_signal(self.model.get_previous_signal)
          if key == 'Q' or key == 'q' or key == 'ctrl c':
              self.signal.register_signals('quit')
              self.signal.emit_signal('quit')
          super().keypress(size, key)
  
subject: Add view policy