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authormike <michael.jmontcalm@gmail.com>2009-04-06 02:41:41 (GMT)
committer mike <michael.jmontcalm@gmail.com>2009-04-06 02:41:41 (GMT)
commit3e92e7a3ab862901e473e5f3a05d08d9af185f68 (patch)
treeb85dcde72fee5ba9f8144458cc7339895aa597de /src
parent7f030fd302c0be7ca7dc38863e1d9250df00ca31 (diff)
Create chain action
Diffstat (limited to 'src')
-rw-r--r--src/sugar/tutorius/actions.py15
-rw-r--r--src/sugar/tutorius/tests/actiontests.py54
2 files changed, 68 insertions, 1 deletions
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()
diff --git a/src/sugar/tutorius/tests/actiontests.py b/src/sugar/tutorius/tests/actiontests.py
index 2a60a65..76a6655 100644
--- a/src/sugar/tutorius/tests/actiontests.py
+++ b/src/sugar/tutorius/tests/actiontests.py
@@ -41,5 +41,57 @@ class PropsTest(unittest.TestCase):
assert prop.get_properties() == ['a'], "Action does not contain property 'a'"
+from sugar.tutorius.actions import ChainAction
+
+class ChainTester(Action):
+ def __init__(self, witness):
+ self._witness = witness
+
+ def do(self, **kwargs):
+ self._witness.append([self,"do"])
+
+ def undo(self):
+ self._witness.append([self,"undo"])
+
+class ChainActionTest(unittest.TestCase):
+ """Tester for ChainAction"""
+ def test_empty(self):
+ """If the expected empty behavior (do nothing) changes
+ and starts throwing exceptions, this will flag it"""
+ a = ChainAction()
+ a.do()
+ a.undo()
+
+ def test_order(self):
+ witness = []
+ first = ChainTester(witness)
+ second = ChainTester(witness)
+
+ c = ChainAction(first, second)
+ assert witness == [], "Actions should not be triggered on init"""
+ c.do()
+
+ assert witness[0][0] is first, "First triggered action must be 'first'"
+ assert witness[0][1] is "do", "Action do() should be triggered"
+
+ assert witness[1][0] is second, "second triggered action must be 'second'"
+ assert witness[1][1] is "do", "Action do() should be triggered"
+
+ assert len(witness) is 2, "Two actions should give 2 do's"
+
+ #empty the witness list
+ while len(witness):
+ rm = witness.pop()
+
+ c.undo()
+ assert witness[1][0] is first, "second triggered action must be 'first'"
+ assert witness[1][1] is "undo", "Action undo() should be triggered"
+
+ assert witness[0][0] is second, "first triggered action must be 'second'"
+ assert witness[0][1] is "undo", "Action undo() should be triggered"
+
+ assert len(witness) is 2, "Two actions should give 2 undo's"
+
+
if __name__ == "__main__":
- unittest.main() \ No newline at end of file
+ unittest.main()