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# (C) Copyright 2005-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
import unittest
from traits.testing.api import UnittestTools
from pyface.undo.api import CommandStack, UndoManager
from pyface.undo.tests.testing_commands import SimpleCommand
class TestUndoManager(unittest.TestCase, UnittestTools):
def setUp(self):
self.stack_a = CommandStack()
self.stack_b = CommandStack()
self.undo_manager = UndoManager()
self.stack_a.undo_manager = self.undo_manager
self.stack_b.undo_manager = self.undo_manager
self.undo_manager.active_stack = self.stack_a
self.command = SimpleCommand()
# Command pushing tests ---------------------------------------------------
def test_undo(self):
self.assertEqual(self.stack_a._index, -1)
self.stack_a.push(self.command)
self.assertEqual(self.stack_a._index, 0)
with self.assertTraitChanges(
self.undo_manager, 'stack_updated', count=1):
self.undo_manager.undo()
self.assertEqual(self.stack_a._index, -1)
def test_redo(self):
self.assertEqual(self.stack_a._index, -1)
self.stack_a.push(self.command)
self.undo_manager.undo()
self.assertEqual(self.stack_a._index, -1)
with self.assertTraitChanges(
self.undo_manager, 'stack_updated', count=1):
self.undo_manager.redo()
self.assertEqual(self.stack_a._index, 0)
def test_change_active_stack(self):
for _ in range(5):
self.stack_a.push(self.command)
self.assertEqual(self.stack_a._index, 4)
self.undo_manager.active_stack = self.stack_b
for _ in range(5):
self.stack_b.push(self.command)
self.assertEqual(self.stack_b._index, 4)
for _ in range(3):
self.undo_manager.undo()
self.undo_manager.redo()
self.assertEqual(self.stack_a._index, 4)
self.assertEqual(self.stack_b._index, 2)
def test_active_stack_clean(self):
self.assertTrue(self.undo_manager.active_stack_clean)
self.stack_a.push(self.command)
self.assertFalse(self.undo_manager.active_stack_clean)
self.undo_manager.active_stack = None
self.assertTrue(self.undo_manager.active_stack_clean)
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