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# (C) Copyright 2004-2023 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!
"""
Apply / Revert
Provides support in a dialog box for an "Apply" button which modifies the
object being viewed, and a "Revert" button, which returns the object to its
starting state (before any "Apply").
Note that this does not automatically provide a full (multi-step incremental)
Undo capability.
"""
from traits.api import HasTraits, Str, List
from traitsui.api import Item, View, Handler, HGroup, VGroup, TextEditor
class ApplyRevert_Handler(Handler):
def apply(self, info):
print('apply called...')
object = info.object
object.stack.insert(0, object.input)
object.queue.append(object.input)
def revert(self, info):
# Do something exciting here...
print('revert called...')
class ApplyRevertDemo(HasTraits):
# Trait definitions:
input = Str()
stack = List()
queue = List()
# Traits view definitions:
traits_view = View(
VGroup(
VGroup(
Item(
'input', show_label=False, editor=TextEditor(auto_set=True)
),
label='Input',
show_border=True,
),
HGroup(
VGroup(
Item(
'stack',
show_label=False,
height=50,
width=100,
style='readonly',
),
label='Stack',
show_border=True,
),
VGroup(
Item(
'queue',
show_label=False,
height=50,
width=100,
style='readonly',
),
label='Queue',
show_border=True,
),
),
),
resizable=True,
height=300,
title='Apply/Revert example',
buttons=['Apply', 'Revert'],
handler=ApplyRevert_Handler,
)
# Create the demo:
modal_popup = ApplyRevertDemo()
# Run the demo (if invoked from the command line):
if __name__ == '__main__':
modal_popup.configure_traits(kind='modal')
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