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#------------------------------------------------------------------------------
#
# Copyright (c) 2012, Enthought, Inc.
# 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
#
# Author: Pietro Berkes
# Date: Feb 2012
#
#------------------------------------------------------------------------------
"""
Test the layout when element appear and disappear with visible_when.
"""
from traits.has_traits import HasTraits
from traits.trait_types import Enum, Bool, Str
from traitsui.group import HGroup, VGroup
from traitsui.include import Include
from traitsui.item import Item
from traitsui.view import View
from traitsui.tests._tools import *
_TEXT_WIDTH = 200
_TEXT_HEIGHT = 100
class VisibleWhenProblem(HasTraits):
which = Enum('one', 'two')
on = Bool
txt = Str
onoff_group = HGroup(
VGroup(
Item('on', resizable=False, width=-100, height=-70),
show_left = False,
show_border = True, visible_when='which == "one"'
),
)
text_group = VGroup(
Item('txt', width=-_TEXT_WIDTH, height=-_TEXT_HEIGHT),
visible_when='which == "two"',
show_border = True,
)
traits_view = View(
Item('which'),
VGroup(
Include('onoff_group'),
Include('text_group'),
),
resizable = True,
buttons = ['OK', 'Cancel']
)
@skip_if_null
def test_visible_when_layout():
# Bug: The size of a dialog that contains elements that are activated
# by "visible_when" can end up being the *sum* of the sizes of the
# elements, even though the elements are mutually exclusive (e.g.,
# a typical case is a dropbox that lets you select different cases).
# The expected behavior is that the size of the dialog should be at most
# the size of the largest combination of elements.
with store_exceptions_on_all_threads():
dialog = VisibleWhenProblem()
ui = dialog.edit_traits()
# have the dialog switch from group one to two and back to one
dialog.which = 'two'
dialog.which = 'one'
# the size of the window should not be larger than the largest
# combination (in this case, the `text_group` plus the `which` item
size = get_dialog_size(ui.control)
# leave some margin for labels, dropbox, etc
nose.tools.assert_less(size[0], _TEXT_WIDTH+100)
nose.tools.assert_less(size[1], _TEXT_HEIGHT+150)
if __name__ == '__main__':
# Execute from command line for manual testing
vw = VisibleWhenProblem(txt='ciao')
ui = vw.configure_traits()
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