src/model/observable.py

   1
   2 class ObservableItem(object):
   3
   4     def __init__(self):
   5         self.observers = []
   6     def __setattr__(self,name,new_value):
   7         #print 'Setting %s to %s'%(name,value)
   8         old_value = getattr(self,name,None)
   9         super(ObservableItem,self).__setattr__(name,new_value)
  10         self.notify_observers(name,new=new_value, old=old_value)
  11
  12     def notify_observers(self,name,new=None,old=None):
  13         if 'observers' in self.__dict__:
  14             for observer in self.observers:
  15                 observer.notify(self,name,new=new,old=old)
  16
  17
  18
  19 class ObservableList(list,ObservableItem):
  20     def __init__(self):
  21         ObservableItem.__init__(self)
  22
  23     def append(self,item):
  24         super(ObservableList,self).append(item)
  25         self.notify_observers('add_item', item, None)
  26
  27     def remove(self,item):
  28         super(ObservableList,self).remove(item)
  29         self.notify_observers('remove_item', item, None)
  30
  31 __all__ = ["ObservableItem","ObservableList"]