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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 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.ui_editor \
import UIEditor
from traitsui.basic_editor_factory \
import BasicEditorFactory
#-- 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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