src/panucci/settings.py

   1 #!/usr/bin/python
   2 #
   3 # This file is part of Panucci.
   4 # Copyright (c) 2008-2009 The Panucci Audiobook and Podcast Player Project
   5 #
   6 # Panucci is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # Panucci is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with Panucci.  If not, see <http://www.gnu.org/licenses/>.
  18 #
  19
  20 import logging
  21 import os.path
  22
  23 from simplegconf import gconf
  24 from services import ObservableService
  25
  26 SIGNAL_NAME_SUFFIX = '_changed'
  27
  28 # If you add a setting _please_ update the schemas file
  29
  30 default_settings = {
  31     'allow_blanking'       : True,
  32     'db_location'          : '~/.panucci.sqlite',
  33     'disable_delayed_skip' : False,
  34     'last_folder'          : '~',
  35     'max_recent_files'     : 10,
  36     'progress_locked'      : False,
  37     'seek_long'            : 60,
  38     'seek_short'           : 10,
  39     'skip_delay'           : 0.5,
  40     'temp_playlist'        : '~/.panucci.m3u',
  41     'volume'               : 0.3,
  42 }
  43
  44 class Settings(ObservableService):
  45     """ A settings manager for Panucci. A signal is emitted when any
  46         setting is changed; signal names are devised as follows:
  47             setting_name + SIGNAL_NAME_SUFFIX
  48
  49         The signal prototype is: def callback( new_value )"""
  50
  51     def __init__(self):
  52         self.__log = logging.getLogger('panucci.settings.Settings')
  53         signals = [ k + SIGNAL_NAME_SUFFIX for k in default_settings.keys() ]
  54         ObservableService.__init__( self, signals, log=self.__log )
  55
  56         gconf.snotify( self.__on_directory_changed )
  57
  58     def __getattr__(self, key):
  59         if default_settings.has_key(key):
  60             return gconf.sget( key, default=default_settings[key] )
  61         else:
  62             self.__log.warning('Setting "%s" doesn\'t exist.' % key)
  63             raise AttributeError
  64
  65     def __setattr__(self, key, value):
  66         if default_settings.has_key(key):
  67             if type(value) == type(default_settings[key]):
  68                 # Don't set the value if it's the same as it used to be
  69                 if getattr(self, key) != value:
  70                     gconf.sset( key, value )
  71
  72                 return True
  73             else:
  74                 self.__log.warning(
  75                     'Type of "%s" (%s) does not match default type (%s)',
  76                     key, type(value).__name__,
  77                     type(default_settings[key]).__name__ )
  78         else:
  79             object.__setattr__( self, key, value )
  80             self.__log.warning('Setting "%s" doesn\'t exist.', key)
  81
  82         return False
  83
  84     def __on_directory_changed(self, client, connection_id, entry, args):
  85         directory, key = os.path.split(entry.get_key())
  86         new_value = getattr(self, key)
  87         self.__log.debug('gconf key %s changed to: %s', key, new_value)
  88         self.notify( key + SIGNAL_NAME_SUFFIX, new_value,
  89             caller=self.__on_directory_changed )
  90
  91     def attach_checkbutton(self, button, setting):
  92         button.connect(
  93             'toggled', lambda w: setattr( self, setting, w.get_active()) )
  94         self.register(
  95             setting + SIGNAL_NAME_SUFFIX, lambda v: button.set_active(v) )
  96         button.set_active( getattr(self, setting) )
  97
  98 settings = Settings()
  99