From c14688d67a82b7ec7746beda90da915c98600a3d Mon Sep 17 00:00:00 2001
From: erick <erick@sugar-dev-erick.(none)>
Date: Sat, 05 Dec 2009 21:03:59 +0000
Subject: Merge branch 'frame_integration' into revamped_dragndrop

Conflicts:
	tutorius/actions.py
---
(limited to 'tutorius/properties.py')

diff --git a/tutorius/properties.py b/tutorius/properties.py
index a462782..07b1645 100644
--- a/tutorius/properties.py
+++ b/tutorius/properties.py
@@ -19,6 +19,7 @@ TutoriusProperties have the same behaviour as python properties (assuming you
 also use the TPropContainer), with the added benefit of having builtin dialog
 prompts and constraint validation.
 """
+import uuid
 from copy import copy, deepcopy
 
 from .constraints import Constraint, \
@@ -35,6 +36,9 @@ from .propwidgets import PropWidget, \
     FloatPropWidget, \
     IntArrayPropWidget
 
+import logging
+LOGGER = logging.getLogger("properties")
+
 class TPropContainer(object):
     """
     A class containing properties. This does the attribute wrapping between
@@ -60,6 +64,14 @@ class TPropContainer(object):
                 self._props[attr_name] = propinstance.validate(
                         copy(propinstance.default))
 
+        self.__id = hash(uuid.uuid4())
+        # The differences dictionary. This is a structure that holds all the
+        # modifications that were made to the properties since the action
+        # was last installed or the last moment the notification was executed.
+        # Every property change will be logged inside it and it will be sent
+        # to the creator to update its action edition dialog.
+        self._diff_dict = {}
+
     def __getattribute__(self, name):
         """
         Process the 'fake' read of properties in the appropriate instance
@@ -93,8 +105,11 @@ class TPropContainer(object):
         try:
             # We attempt to get the property object with __getattribute__ 
             # to work through inheritance and benefit of the MRO.
-            return props.__setitem__(name,
+            real_value = props.__setitem__(name,
                     object.__getattribute__(self, name).validate(value))
+            LOGGER.debug("Action :: caching %s = %s in diff dict"%(name, str(value))) 
+            self._diff_dict[name] = value 
+            return real_value
         except AttributeError:
             return object.__setattr__(self, name, value)
 
@@ -123,26 +138,32 @@ class TPropContainer(object):
         """
         Return a deep copy of the dictionary of properties from that object.
         """
-        return deepcopy(self._props) 
+        return deepcopy(self._props)
 
-    # Providing the hash methods necessary to use TPropContainers
-    # in a dictionary, according to their properties
     def __hash__(self):
-        #Return a hash of properties (key, value) sorted by key
-        #We need to transform the list of property key, value lists into 
-        # a tuple of key, value tuples
-        return hash(tuple(map(tuple,sorted(self._props.items(), cmp=lambda x, y: cmp(x[0], y[0])))))
-
-    def __eq__(self, e2):
-        return isinstance(e2, type(self)) and self._props == e2._props
+        """
+        Deprecated.
+        
+        Property containers should not be used as keys inside dictionary for
+        the time being. Since containers are mutable, we should definitely
+        use the addressing mechanism to refer to the containers.
+        """
+        # Many places we use containers as keys to store additional data.
+        # Since containers are mutable, there is a need for a hash function
+        # where the result is constant, so we can still lookup old instances.
+        return self.__id
 
     # Adding methods for pickling and unpickling an object with
     # properties
     def __getstate__(self):
-       return self._props.copy()
+        return dict(id=self.__id, props=self._props.copy())
 
     def __setstate__(self, dict):
-       self._props.update(dict)
+        self.__id = dict['id']
+        self._props.update(dict['props'])
+
+    def __eq__(self, e2):
+        return (isinstance(e2, type(self)) and self._props == e2._props)
 
 class TutoriusProperty(object):
     """
--
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