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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!
"""
**WARNING**
This demo might not work as expected and some documented features might be
missing.
-------------------------------------------------------------------------------
Creating a multi-select list box
How to use a TabularEditor to create a multi-select list box.
This demo uses two TabularEditors, side-by-side. Selections from the left table
are shown in the right table. Each table has only one column.
"""
# Issues related to the demo warning: enthought/traitsui#14,
# enthought/traitsui#15, enthought/traitsui#960
from traits.api import HasPrivateTraits, List, Str, Property
from traitsui.api import View, HGroup, UItem, TabularAdapter, TabularEditor
class MultiSelectAdapter(TabularAdapter):
"""This adapter is used by both the left and right tables"""
# Titles and column names for each column of a table.
# In this example, each table has only one column.
columns = [('', 'myvalue')]
# Magically named trait which gives the display text of the column named
# 'myvalue'. This is done using a Traits Property and its getter:
myvalue_text = Property()
# The getter for Property 'myvalue_text' simply takes the value of the
# corresponding item in the list being displayed in this table.
# A more complicated example could format the item before displaying it.
def _get_myvalue_text(self):
return self.item
class MultiSelect(HasPrivateTraits):
"""This is the class used to view two tables"""
# FIXME (TraitsUI defect #14): When multi-select is done by keyboard
# (shift+arrow), the 'selected' trait list does not update.
# FIXME (TraitsUI defect #15): In Windows wx, when show_titles is False,
# left table does not draw until selection passes through all rows.
# (Workaround here: set show_titles True and make column titles empty.)
choices = List(Str)
selected = List(Str)
traits_view = View(
HGroup(
UItem(
'choices',
editor=TabularEditor(
show_titles=True,
selected='selected',
editable=False,
multi_select=True,
adapter=MultiSelectAdapter(),
),
),
UItem(
'selected',
editor=TabularEditor(
show_titles=True,
editable=False,
adapter=MultiSelectAdapter(),
),
),
),
resizable=True,
width=200,
height=300,
)
# Create the demo:
demo = MultiSelect(
choices=[
'one',
'two',
'three',
'four',
'five',
'six',
'seven',
'eight',
'nine',
'ten',
]
)
# Run the demo (if invoked from the command line):
if __name__ == '__main__':
demo.configure_traits()
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