From 3e92e7a3ab862901e473e5f3a05d08d9af185f68 Mon Sep 17 00:00:00 2001
From: mike <michael.jmontcalm@gmail.com>
Date: Mon, 06 Apr 2009 02:41:41 +0000
Subject: Create chain action

---
(limited to 'src/sugar/tutorius/actions.py')

diff --git a/src/sugar/tutorius/actions.py b/src/sugar/tutorius/actions.py
index 60ccd8b..7681dea 100644
--- a/src/sugar/tutorius/actions.py
+++ b/src/sugar/tutorius/actions.py
@@ -213,4 +213,19 @@ class WidgetIdentifyAction(Action):
         if self._dialog:
             self._dialog.destroy()
 
+class ChainAction(Action):
+    """Utility class to allow executing actions in a specific order"""
+    def __init__(self, *actions):
+        """ChainAction(action1, ... ) builds a chain of actions"""
+        self._actions = actions
+
+    def do(self,**kwargs):
+        """do() each action in the chain"""
+        for act in self._actions:
+            act.do(**kwargs)
+
+    def undo(self):
+        """undo() each action in the chain, starting with the last"""
+        for act in reversed(self._actions):
+            act.undo()
 
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