/usr/share/pyshared/pyface/toolkit.py is in python-pyface 4.0.0-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 | #------------------------------------------------------------------------------
# Copyright (c) 2007, Riverbank Computing Limited
# 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
#
#------------------------------------------------------------------------------
# Standard library imports.
import os
import sys
# Enthought library imports.
from traits.etsconfig.api import ETSConfig
# This is set to the root part of the module path for the selected backend.
_toolkit_backend = None
def _init_toolkit():
""" Initialise the current toolkit. """
def import_toolkit(tk):
try:
# Try and import the toolkit's pyface backend init module.
be = 'pyface.ui.%s.' % tk
__import__(be + 'init')
except:
raise
return be
# Get the toolkit.
if ETSConfig.toolkit:
be = import_toolkit(ETSConfig.toolkit)
else:
# Toolkits to check for if none is explicitly specified.
known_toolkits = ('wx', 'qt4', 'null')
for tk in known_toolkits:
try:
be = import_toolkit(tk)
# In case we have just decided on a toolkit, tell everybody else.
ETSConfig.toolkit = tk
break
except (SystemExit, ImportError):
import traceback
print >>sys.stderr, ('Warning: Unable to import the %s backend '
'for pyface due to traceback: %s\n') % (tk,
traceback.format_exc().strip().replace('\n', '\n\t'))
else:
# Try to import the null toolkit but don't set the ETSConfig toolkit
try:
be = import_toolkit('null')
print >>sys.stderr, ("Info: Unable to import any backend (%s) "
"for pyface; using the 'null' toolkit instead.\n") % ", ".join(known_toolkits)
except:
raise ImportError("Unable to import a pyface backend for any "
"of the %s toolkits" % ", ".join(known_toolkits))
# Save the imported toolkit module.
global _toolkit_backend
_toolkit_backend = be
# Do this once then disappear.
_init_toolkit()
del _init_toolkit
def toolkit_object(name):
""" 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(':')
be_mname = _toolkit_backend + mname
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 pyface backend doesn't implement %s" % (ETSConfig.toolkit, oname))
be_obj = Unimplemented
try:
__import__(be_mname)
try:
be_obj = getattr(sys.modules[be_mname], oname)
except AttributeError:
pass
except ImportError, e:
# Ignore *ANY* errors unless a debug ENV variable is set.
if 'ETS_DEBUG' in os.environ:
# Attempt to only skip errors in importing the backend modules.
# The idea here is that this only happens when the last entry in
# the traceback's stack frame mentions the toolkit in question.
import traceback
frames = traceback.extract_tb(sys.exc_traceback)
filename, lineno, function, text = frames[-1]
if not _toolkit_backend in filename:
raise
return be_obj
|