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# (C) Copyright 2007-2023 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!
# ------------------------------------------------------------------------------
# Copyright (c) 2008, Riverbank Computing Limited
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in enthought/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!
#
# Author: Riverbank Computing Limited
# Description: <Enthought undo package component>
# ------------------------------------------------------------------------------
# Enthought library imports.
from traits.api import Bool, Event, Instance, Int, Interface, Str
class IUndoManager(Interface):
"""The undo manager interface. An undo manager is responsible for one or
more command stacks. Typically an application would have a single undo
manager.
"""
#### 'IUndoManager' interface #############################################
#: This is the currently active command stack and may be None. Typically it
#: is set when some sort of editor becomes active.
#: IUndoManager and ICommandStack depend on one another, hence we can't
#: directly import ICommandStack and use it here.
active_stack = Instance("pyface.undo.api.ICommandStack")
#: This reflects the clean state of the currently active command stack. It
#: is intended to support a "document modified" indicator in the GUI. It is
#: maintained by the undo manager.
active_stack_clean = Bool()
#: This is the name of the command that can be redone. It will be empty if
#: there is no command that can be redone. It is maintained by the undo
#: manager.
redo_name = Str()
#: This is the sequence number of the next command to be performed. It is
#: incremented immediately before a command is invoked (by its 'do()'
#: method).
sequence_nr = Int()
#: This event is fired when the index of a command stack changes. Note that
#: it may not be the active stack.
stack_updated = Event(Instance("pyface.undo.api.ICommandStack"))
#: This is the name of the command that can be undone. It will be empty if
#: there is no command that can be undone. It is maintained by the undo
#: manager.
undo_name = Str()
###########################################################################
# 'IUndoManager' interface.
###########################################################################
def redo(self):
""" Redo the last undone command of the active command stack. """
def undo(self):
""" Undo the last command of the active command stack. """
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