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#-------------------------------------------------------------------------------
#
# Define support classes for implementing 'radio button' style components.
#
# Written by: David C. Morrill
#
# Date: 10/01/2003
#
# (c) Copyright 2003 by Enthought, Inc.
#
#-------------------------------------------------------------------------------
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
from traits.api import HasPrivateTraits, Trait
#-------------------------------------------------------------------------------
# Trait definitions:
#-------------------------------------------------------------------------------
# ARadioGroup = Instance( 'RadioGroup' )
#-------------------------------------------------------------------------------
# 'RadioStyle' class:
#-------------------------------------------------------------------------------
class RadioStyle ( HasPrivateTraits ):
#---------------------------------------------------------------------------
# Trait definitions:
#---------------------------------------------------------------------------
# radio_group = ARadioGroup
#---------------------------------------------------------------------------
# Handle the group the radio style component belongs to being changed:
#---------------------------------------------------------------------------
def _group_changed ( self, old, new ):
if old is not None:
old.remove( self )
if new is not None:
new.add( self )
#-------------------------------------------------------------------------------
# 'RadioGroup' class:
#-------------------------------------------------------------------------------
class RadioGroup ( HasPrivateTraits ):
#---------------------------------------------------------------------------
# Trait definitions:
#---------------------------------------------------------------------------
# selection = Instance( RadioStyle )
selection = Trait(None, RadioStyle)
#---------------------------------------------------------------------------
# Handle elements being added to the group:
#---------------------------------------------------------------------------
def add ( self, *components ):
for component in components:
component.radio_group = self
if component.selected and (self.selection is not component):
if self.selection is not None:
component.selected = False
else:
self.selection = component
#---------------------------------------------------------------------------
# Handle components being removed from the group:
#---------------------------------------------------------------------------
def remove ( self, *components ):
for component in components:
if component is self.selection:
self.selection is None
break
#---------------------------------------------------------------------------
# Handle the selection being changed:
#---------------------------------------------------------------------------
def _selection_changed ( self, old, new ):
if old is not None:
old.selected = False
radio_group_trait = Trait(None, RadioGroup)
RadioStyle.add_class_trait('radio_group', radio_group_trait)
|
