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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!
from traits.api import Int
from pyface.undo.api import AbstractCommand
class SimpleCommand(AbstractCommand):
""" Simplest command possible operating on an integer. """
name = "Increment by 1"
data = Int()
def do(self):
self.redo()
def redo(self):
self.data += 1
def undo(self):
self.data -= 1
class UnnamedCommand(SimpleCommand):
name = ""
class MergeableCommand(SimpleCommand):
name = "Increment"
amount = Int(1)
def do(self):
self.redo()
def redo(self):
self.data += self.amount
def undo(self):
self.data -= self.amount
def merge(self, other):
if not isinstance(other, MergeableCommand):
return False
self.data += other.amount
self.amount += other.amount
return True
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