Add files from the old svn, r101.

[matthijs/upstream/mobilegtd.git] / src / model / observable.py

diff --git a/src/model/observable.py b/src/model/observable.py
new file mode 100644 (file)
index 0000000..e8a0e9b
--- /dev/null
+++ b/src/model/observable.py
@@ -0,0 +1,31 @@
+
+class ObservableItem(object):
+    
+    def __init__(self):
+        self.observers = []
+    def __setattr__(self,name,new_value):
+        #print 'Setting %s to %s'%(name,value)
+        old_value = getattr(self,name,None)
+        super(ObservableItem,self).__setattr__(name,new_value)
+        self.notify_observers(name,new=new_value, old=old_value)
+
+    def notify_observers(self,name,new=None,old=None):
+        if 'observers' in self.__dict__:
+            for observer in self.observers:
+                observer.notify(self,name,new=new,old=old)
+
+
+
+class ObservableList(list,ObservableItem):
+    def __init__(self):
+        ObservableItem.__init__(self)
+
+    def append(self,item):
+        super(ObservableList,self).append(item)
+        self.notify_observers('add_item', item, None)   
+
+    def remove(self,item):
+        super(ObservableList,self).remove(item)
+        self.notify_observers('remove_item', item, None)   
+
+__all__ = ["ObservableItem","ObservableList"]