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# Copyright (c) 2007, Enthought, Inc.
# License: BSD Style.
"""
Another demo showing how to use a TabularEditor to create a multi-select list
box. This demo creates a reusable StringListEditor class and uses that instead
of defining the editor as part of the demo class.
This approach greatly simplifies the actual demo class and shows how to
construct a reusable Traits UI-based editor that can be used in other
applications.
"""
#-- Imports ------------------------------------------------------------------
from __future__ import absolute_import
from traits.api import HasPrivateTraits, List, Str, Property, on_trait_change
from traitsui.api import View, HGroup, Item, TabularEditor
from traitsui.tabular_adapter import TabularAdapter
from traitsui.basic_editor_factory import BasicEditorFactory
from traits.etsconfig.api import ETSConfig
if ETSConfig.toolkit == 'wx':
from traitsui.wx.ui_editor import UIEditor
else:
from traitsui.qt4.ui_editor import UIEditor
#-- Define the reusable StringListEditor class and its helper classes --------
# Define the tabular adapter used by the Traits UI string list editor:
class MultiSelectAdapter(TabularAdapter):
# The columns in the table (just the string value):
columns = [('Value', 'value')]
# The text property used for the 'value' column:
value_text = Property
def _get_value_text(self):
return self.item
# Define the actual Traits UI string list editor:
class _StringListEditor(UIEditor):
# Indicate that the editor is scrollable/resizable:
scrollable = True
# The list of available editor choices:
choices = List(Str)
# The list of currently selected items:
selected = List(Str)
# The traits UI view used by the editor:
view = View(
Item('choices',
show_label=False,
editor=TabularEditor(
show_titles=False,
selected='selected',
editable=False,
multi_select=True,
adapter=MultiSelectAdapter())
),
id='string_list_editor',
resizable=True
)
def init_ui(self, parent):
self.sync_value(self.factory.choices, 'choices', 'from',
is_list=True)
self.selected = self.value
return self.edit_traits(parent=parent, kind='subpanel')
@on_trait_change(' selected')
def _selected_modified(self):
self.value = self.selected
# Define the StringListEditor class used by client code:
class StringListEditor(BasicEditorFactory):
# The editor implementation class:
klass = _StringListEditor
# The extended trait name containing the editor's set of choices:
choices = Str
#-- Define the demo class ----------------------------------------------------
class MultiSelect(HasPrivateTraits):
""" This class demonstrates using the StringListEditor to select a set
of string values from a set of choices.
"""
# The list of choices to select from:
choices = List(Str)
# The currently selected list of choices:
selected = List(Str)
# A dummy result so that we can display the selection using the same
# StringListEditor:
result = List(Str)
# A traits view showing the list of choices on the left-hand side, and
# the currently selected choices on the right-hand side:
view = View(
HGroup(
Item('selected',
show_label=False,
editor=StringListEditor(choices='choices')
),
Item('result',
show_label=False,
editor=StringListEditor(choices='selected')
)
),
width=0.20,
height=0.25
)
# Create the demo:
demo = MultiSelect(choices=['one', 'two', 'three', 'four', 'five', 'six',
'seven', 'eight', 'nine', 'ten'],
selected=['two', 'five', 'nine'])
# Run the demo (if invoked from the command line):
if __name__ == '__main__':
demo.configure_traits()
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