1 files changed, 44 insertions, 0 deletions
diff --git a/addons/chainaction.py b/addons/chainaction.py
new file mode 100644
index 0000000..43c4fa4
--- /dev/null
+++ b/addons/chainaction.py
@@ -0,0 +1,44 @@
+# Copyright (C) 2009, Tutorius.org
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+from sugar.tutorius.actions import * 
+
+class ChainAction(Action):
+    actions = TAddonListProperty()
+
+    """Utility class to allow executing actions in a specific order"""
+    def __init__(self, actions=[]):
+        """ChainAction(action1, ... ) builds a chain of actions"""
+        Action.__init__(self)
+        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()
+
+__action__ = {
+    'name': 'ChainAction',
+    'display_name' : 'Chain of actions',
+    'icon' : 'chain',
+    'class' : ChainAction,
+    'mandatory_props' : ['actions']
+}