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#-------------------------------------------------------------------------------
#
# Copyright (c) 2009, 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
#
# Thanks for using Enthought open source!
#
#-------------------------------------------------------------------------------
# Standard library imports
import sys
# ETS imports
from enthought.etsconfig.api import ETSConfig
def _init_toolkit():
""" Initialise the current toolkit.
"""
# Force Traits to decide on its toolkit if it hasn't already
from enthought.traits.ui.toolkit import toolkit as traits_toolkit
traits_toolkit()
# Import the selected backend
backend = 'enthought.savage.traits.ui.%s' % ETSConfig.toolkit
try:
__import__(backend)
except ImportError, SystemExit:
raise ImportError, "Unable to import a Savage backend for the %s " \
"toolkit." % ETSConfig.toolkit
# Save the imported toolkit module.
global _toolkit_backend
_toolkit_backend = backend
# Do this once then disappear.
_init_toolkit()
del _init_toolkit
def toolkit_object(name, raise_exceptions=False):
""" Return the toolkit specific object with the given name. The name
consists of the relative module path and the object name separated by a
colon.
"""
mname, oname = name.split(':')
class Unimplemented (object):
""" This is returned if an object isn't implemented by the selected
toolkit. It raises an exception if it is ever instantiated.
"""
def __init__(self, *args, **kwargs):
raise NotImplementedError("The %s Savage backend doesn't implement"
"%s" % (ETSConfig.toolkit, oname))
be_obj = Unimplemented
be_mname = _toolkit_backend + '.' + mname
try:
__import__(be_mname)
try:
be_obj = getattr(sys.modules[be_mname], oname)
except AttributeError, e:
if raise_exceptions: raise e
except ImportError, e:
if raise_exceptions: raise e
return be_obj
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